JP3428368B2 - District heating and cooling system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a district heating and cooling system generally used in a metropolitan area or the like, and more particularly to measures for improving the efficiency of the system.

[0002]

2. Description of the Related Art Conventionally, for example, "New Edition Refrigeration and Air Conditioning Handbook"
4th Edition Application (Edited by The Japan Refrigeration Association, Showa 56)
Page 245 of “May 30, 2013)”, steam, high-temperature water, cold water, etc. are supplied from a heat source plant to a building in a specific area such as a large city, and heating and cooling in this building are performed. A district heating and cooling system is known which is used for hot water supply. This system has advantages such as unification of air pollution and utilization of waste heat for waste disposal.

A general district heating and cooling system will be described below. As a form of utilizing the heat from the heat source plant, it is common to install an air handling unit or a fan coil unit indoors.

The system in which the air handling unit is installed has an air duct, and is equipped with a heat exchanger for exchanging heat between the air circulating in the air duct and the heat medium (steam or the like) from the heat source plant. . For example, at the time of heating the room, the heat is supplied from the heat medium to the air by the heat exchanger to supply the heated air to the air-conditioned room to heat the room.

The system in which the fan coil unit is installed has a water circulation circuit, and a heat exchanger for exchanging heat between the water circulating in the water circulation circuit and the heat medium (steam or the like) from the heat source plant. I have it. A part of the water circulation circuit is drawn into the fan coil unit. With this configuration, when the room is heated, the heat exchanger heats the water from the heat medium to raise the temperature of the water, which causes the water to exchange heat with the air in the fan coil unit, and the air is supplied to the air-conditioned room as conditioned air. Then, the room is heated.

[0006]

However, the conventional district heating and cooling system as described above has the following problems.

In the case of using the air handling unit, since it is necessary to circulate the air between the heat exchanger and the room, a large transportation power is required, and the equipment for obtaining the transportation power is installed. A machine room to operate is also required. Therefore, there is a limit to the reduction of running cost, and there is a problem that a large-scale facility is required.

In the case of using the fan coil unit, since it is necessary to extend the water pipe to the inside of the room, there is a fear of water leakage, and periodical water leakage inspection or the like becomes necessary.

Instead of the above-mentioned two types of usage forms, there is also one in which a freezing device is provided on the usage side. That is, a compressor, a heat source side heat exchanger for exchanging heat with the heat medium from the heat source plant, an expansion valve, a refrigerant circuit in which a user side heat exchanger installed in the room is connected by a refrigerant pipe so that refrigerant can circulate. It is designed to be equipped with.

However, the one provided with such a refrigeration circuit is not practical because the input to the compressor is large and the power consumption is increased.

The present invention has been made in view of this point, and an object thereof is to solve the problems in the case where an air handling unit or a fan coil unit is installed in a district heating and cooling system, and to reduce power consumption. It is to obtain high efficiency.

[0012]

In order to achieve the above object, the present invention involves a phase change as a circuit utilizing the heat of a heat source medium (hot water or cold water) supplied from a heat source facility (heat source plant). By using a refrigerant circulation circuit and obtaining the circulation driving force of the refrigerant on the liquid side of this circuit, a highly efficient operating state can be realized.

Specifically, in the invention according to claim 1, as shown in FIG. 1 or 2, the heat source medium is supplied from the heat source facility to a specific area, and the heat of the heat source medium in the area is used. Assuming a district heating and cooling system that A heat source side that includes a use side refrigerant circuit (2) that uses the heat of the heat source medium, and that performs heat exchange between the refrigerant circulating in the circuit (2) and the heat source medium in the use side refrigerant circuit (2) A heat exchanger (4) and a use side heat exchanger (9) are provided. The heat exchangers (4) and (9) are connected to each other by a gas pipe (8) through which a gas refrigerant flows and a liquid pipe (7) through which a liquid refrigerant flows to form a closed circuit. Further, the liquid pipe (7) of the use-side refrigerant circuit (2), a conveying means (5) for giving a circulation driving force to the refrigerant of the use-side refrigerant circuit (2)
Are connected.

According to this particular matter, the heat source side heat exchanger
In (4), heat exchange is performed between the refrigerant circulating in the use side refrigerant circuit (2) and the heat source medium supplied from the heat source equipment,
The heat given to the user side refrigerant circuit (2) is used by the user side heat exchanger (9).
It is transported to and used for indoor air conditioning. At this time, in the utilization side refrigerant circuit (2), the circulation driving force of the refrigerant is given by the transfer means (5) provided in the liquid pipe (7). Therefore, it is only necessary to increase the pressure of the refrigerant in the liquid phase to the pressure necessary for circulation, and the input for obtaining this circulation driving force (for example, power consumption when using a mechanical pump) is small.

Further, the problems such as those in which a conventional air handling unit or a fan coil unit is installed are solved. In other words, unlike the air handling unit, it is not necessary to circulate the air between the heat exchanger on the heat source side and the room by the air duct, so that a large transport power is not required. Further, unlike the fan coil unit, the water pipe is not extended to the inside of the room, so there is no fear of water leakage.

The invention according to claim 1 is for heating a refrigerant.
Or the refrigerant circulation driving force can be applied by utilizing the pressure change accompanying cooling.
It's something I got to get. In other words, in the above configuration
And a driving force generation circuit capable of storing the liquid refrigerant in the transport means.
It consists of (5). In addition, the drive force generation circuit (5)
Connect the power source circuit (40) to allow heat exchange. This drive source circuit
It is possible to circulate the driving refrigerant in (40), and the driving force generation circuit described above.
Drive the liquid refrigerant from (5) so that it is pushed out to the refrigerant circuit (2) on the user side.
The liquid refrigerant in the driving force generation circuit (5) is heated by the working refrigerant.
A pressure means (11) for generating high pressure by
The liquid refrigerant in the side refrigerant circuit (2) is sucked into the driving force generation circuit (5).
Drive power generation circuit (5)
Decompression means for producing low pressure by cooling the gas refrigerant of
(12) and is provided.

Due to this specific matter, the pressure means (11) generates
Utilizing high pressure and low pressure generated by decompression means (12)
The refrigerant circulation drive force in the side refrigerant circuit (2) must not be obtained.
It Therefore, it is possible to drive the circulation without using mechanical means.
Power can be obtained, and a highly reliable transportation means can be realized.

Further, in the invention of claim 1, the driving force is
The circuit configuration of the generation circuit (5) is embodied. Specifically
Is a liquid refrigerant in the driving force generation circuit (5) in the above configuration.
Provide tank means (T1, T2) capable of storing. Refrigerant heating
High pressure is applied to the tank means (T1, T2) by the tank
Pressurizing operation to push out the liquid refrigerant from the cooling means (T1, T2),
By applying low pressure to the tank means (T1, T2) by cooling the
For decompression operation to recover liquid refrigerant to the tank means (T1, T2)
To circulate the refrigerant through the refrigerant circuit on the user side (2)
There is.

Due to this specific matter, the driving force generation circuit (5)
Can be made practical.

The invention according to claim 2 is also specified from the heat source equipment.
Supply the heat source medium to the area of
It is premised on the district heating and cooling system that is designed to be used.
It is equipped with a user-side refrigerant circuit (2) that uses the heat of the heat source medium.
The cooling circuit that circulates in the use side refrigerant circuit (2).
Heat source side heat exchanger that exchanges heat between the medium and the heat source medium (4)
And a use side heat exchanger (9). Each of these heat exchange
Gas pipe (8) through which gas refrigerant flows between the converters (4) and (9)
And closed by connecting with the liquid piping (7) through which the liquid refrigerant flows.
Make a road. Also, the liquid piping of the above-mentioned use side refrigerant circuit (2)
In (7), apply the circulation driving force to the refrigerant in the use side refrigerant circuit (2).
The transport means (5) is connected.

Further, the invention according to claim 2 also adds a refrigerant.
Refrigerant circulation driving force using pressure change due to heat or cooling
The heat from the heat source equipment is used.
Then, heating or cooling for transportation is performed. That is, heat
High temperature side piping (1C) that supplies high temperature fluid from the source equipment and low
Extend the low temperature side pipe (1A) that supplies the warm fluid. Also, transport
The means comprises a driving force generation circuit (5). This driving force
The liquid refrigerant in the driving force generation circuit (5) is heated in the generation circuit (5).
High-pressure generated by the use of the liquid refrigerant to use the refrigerant circuit
Between the high temperature side pipe (1C) and the high temperature fluid so that it is pushed out to (2).
Heat side heat exchanger (11b) that can exchange heat with
The low pressure produced by cooling the gas refrigerant in line (5) is beneficial.
Suction the liquid refrigerant from the working side refrigerant circuit (2) into the driving force generation circuit (5)
Heat exchange with the low temperature fluid in the low temperature side piping (1A)
As a configuration with a possible cooling side heat exchanger (12b)
There is.

Depending on this particular matter, special heating or cooling
Use-side refrigerant circuit to the teeth such that it requires a means for retirement
Since the refrigerant circulation driving force in (2) can be obtained, the configuration can be simplified.
Efficient use of heat supplied from oxidization and heat source equipment
It

Further , the driving force generating circuit (5) stores the liquid refrigerant.
Provide tank means (T1, T2) that can By heating the refrigerant
By applying a high pressure to the tank means (T1, T2)
Pressurizing operation to push out the liquid refrigerant from the stages (T1, T2) and cooling the refrigerant.
By applying a low pressure to the tank means (T1, T2),
By the decompression operation to recover the liquid refrigerant to the link means (T1, T2)
Refrigerant is circulated in the user side refrigerant circuit (2)
It

Due to this specific matter, the driving force generation circuit (5)
Can be made practical.

The invention according to claim 3 is an improvement of the tank means.
Ensures continuous circulation of refrigerant in the user side refrigerant circuit (2).
It is something that can be done. That is, claim 1
Or in the district heating and cooling system described in 2, the tank hand
First and second tank means having stages connected in parallel to each other
It consists of (T1, T2). Also, apply high pressure to the first tank means (T1).
And a first pressure that gives a low pressure to the second tank means (T2).
Both force action and application of low pressure to the first tank means (T1)
The second pressure action which gives high pressure to the second tank means (T2)
Alternate between work and work. As a result, the first pressure action motion
During operation, heat exchange from the first tank means (T1) to the evaporator
The liquid refrigerant is supplied to the condensers (9) and (4), and the heat used as the condenser
Liquid refrigerant is recovered from the exchangers (4) and (9) to the second tank means (T2).
On the other hand, during the second pressure action operation, the second tank means
Liquid refrigerant is supplied from (T2) to the heat exchangers (4) and (9) that function as evaporators.
The heat exchangers (9) and (4), which serve as condensers,
Circulate the refrigerant so that the liquid refrigerant is collected in the link means (T1).
Heat absorption or heat dissipation to the user side heat exchanger (9) continuously.
I am trying to let you.

Depending on this particular matter, one of the tank means
Liquid refrigerant is pushed out, and the liquid refrigerant is discharged to the other tank means.
Will be recovered, so that
Heat or heat dissipation is continuously performed. Therefore, the present invention
When applied to an air conditioner, etc.
It can be maintained satisfactorily for a long time.

According to the invention of claim 4, the present invention is applied to the user side.
Applied to the heat exchanger (9) for absorbing heat
Is. That is, the district cooling and heating according to claim 1 or 2 above.
In the tassel system, the use-side refrigerant circuit (2) is
The gas refrigerant condenses in the exchanger (4) and becomes liquid in the user side heat exchanger (9).
The configuration is such that the refrigerant evaporates. Heat source medium
A fluid having a temperature lower than that of the gas refrigerant flowing through the heat exchanger (4),
The heat source side heat exchanger (4) is used to exchange heat between this fluid and the refrigerant.
To condense the refrigerant.

Due to this specific matter, the system according to the present invention is
The heat absorption operation in the heat exchanger (9) on the user side
Therefore, it is effective when used for indoor cooling operation etc.
It enables efficient cooling operation.

According to the invention of claim 5, the present invention is applied to the user side.
Applied to heat exchanger (9) for heat dissipation
Is. That is, the district cooling and heating according to claim 1 or 2 above.
In the tassel system, the use-side refrigerant circuit (2) is
The liquid refrigerant evaporates in the exchanger (4) and gas in the user side heat exchanger (9).
The configuration is such that the refrigerant condenses. Heat source medium
A fluid with a temperature higher than that of the liquid refrigerant flowing through the heat exchanger (4)
Install a heat exchanger (4) on the source side to exchange heat between this fluid and the refrigerant.
It is configured so as to evaporate the refrigerant.

Due to this specific matter, the system according to the present invention is
Heat dissipation operation in the heat exchanger on the user side (9)
Therefore, it is effective when used for indoor heating operation etc.
It enables efficient heating operation.

According to the invention of claim 6, the present invention is applied to the user side.
Switchable between heat absorption and heat dissipation of the heat exchanger (9)
It is applied when doing. That is, claim 1
Supply of high temperature fluid in the district heating and cooling system
High temperature side piping (1C) and low temperature side piping (1C) that supplies low temperature fluid
Extend A) from the heat source equipment. Use the refrigerant circuit (2) on the user side as the heat source.
First refrigerant circulation state in which gas refrigerant is condensed in the side heat exchanger (4)
State and the second cooling mode in which the liquid refrigerant evaporates in the heat source side heat exchanger (4).
It is configured to be able to switch to the medium circulation state. Also , the above
Flows through the heat source side heat exchanger (4) when the refrigerant is in circulation state 1
Heat exchange between the gas refrigerant and the low temperature fluid in the low temperature side piping (1A)
In the first switching state to be performed and the second refrigerant circulation state
Liquid refrigerant flowing through the heat source side heat exchanger (4) and high temperature side piping (1C)
A second switching state in which heat is exchanged with the hot fluid of
As a configuration with switching means (31, 32) that can be switched to
There is.

Due to this specific matter, the switching means (31, 32)
With the switching operation, the liquid refrigerant vaporizes in the heat exchanger (9) on the user side.
The endothermic action that occurs and the gas refrigerant is condensed in the heat exchanger (9) on the use side.
It becomes possible to arbitrarily set the heat radiation operation to shrink,
The versatility of this system is improved.

The invention according to claim 7 is also the use side of the present invention.
Switchable between heat absorption and heat dissipation of the heat exchanger (9)
It is applied when doing. That is, claim 2
In the district heating and cooling system, the user side refrigerant circuit (2)
In the first heat source side heat exchanger (4) where the gas refrigerant condenses.
Liquid refrigerant evaporates in the medium circulation state and in the heat source side heat exchanger (4)
It is configured to be switchable to the second refrigerant circulation state. Well
Also, in the first refrigerant circulation state, the heat source side heat exchanger
The gas refrigerant flowing through (4) and the low temperature fluid in the low temperature side pipe (1A)
Between the first switching state for heat exchange between the two and the second refrigerant circulation.
The liquid refrigerant flowing through the heat source side heat exchanger (4) and the high
Second cut for heat exchange with hot fluid in warm side pipe (1C)
Provided with switching means (31, 32) capable of switching to the switching state
It has a structure.

Due to this specific matter, the switching means (31, 32)
With the switching operation, the liquid refrigerant vaporizes in the heat exchanger (9) on the user side.
The endothermic action that occurs and the gas refrigerant is condensed in the heat exchanger (9) on the use side.
It becomes possible to arbitrarily set the heat radiation operation to shrink,
The versatility of this system is improved.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a plurality of embodiments according to the present invention will be described with reference to the drawings. In each of the following embodiments, a case where the district heating / cooling system according to the present invention is applied to an air conditioner that performs air conditioning in a room will be described.

(First Embodiment) First, a first embodiment will be described in which a pump is used in the circulation circuit on the user side and the air conditioner is exclusively used for cooling.

As shown in FIG. 1, the system of this embodiment is
It comprises a heat source side pipe (1) and a utilization side circuit (2).

The heat source side pipe (1) is provided with a cold water supply pipe (1A) and a cold water recovery pipe (1B) extending from a heat source plant (not shown) as heat source equipment. These pipes (1A, 1B) are connected by a branch line (3). Part of this branch line (3) is the first heat transfer tube (4a) of the heat source side heat exchanger (4) described later.
Is configured. In other words, it is generated in the heat source plant,
A part of the cold water (for example, 7 ° C) flowing through the cold water supply pipe (1A) is diverted to the branch line (3) and is collected in the cold water recovery pipe (1B) through the first heat transfer pipe (4a). There is.

On the other hand, the utilization side circuit (2) is a heat source side heat exchanger.
The second heat transfer tube (4b) of (4), the pump (5) as a transfer means,
Multiple indoor units (6,6, ...) are liquid piping (7) and gas piping
The refrigerant is circulated by (8). Specifically, the discharge side of the pump (5) is branched into a plurality of branch pipes (7a, 7a ...), and each branch pipe (7a, 7a ...) Is connected to the liquid side of the indoor unit (6). On the other hand, the connection side of the gas pipe (8) to the indoor unit (6,6, ...) is also branched into a plurality of branch pipes (8a, 8a ...), and each of these branch pipes (8a, 8a ...) 6,6,
...) is connected to the gas side. Indoor unit (6,6, ...)
The electric expansion valve (EV) and the indoor side heat exchanger (9) as a utilization side heat exchanger are housed in the. In other words, in the use side circuit (2), heat is transferred between the heat source side heat exchanger (4) and the indoor side heat exchanger (9) by the circulation operation of the refrigerant accompanying the driving of the pump (5). It is configured to be opened.

Next, the operating state (cooling operating state) of this system will be described. In the heat source side pipe (1), the cold water generated in the heat source plant flows through the cold water supply pipe (1A). Part of this cold water passes through the branch line (3) and the heat source side heat exchanger (4)
After flowing through the first heat transfer tube (4a), the cold water recovery tube (1B) recovers and returns to the heat source plant. Such a circulating state of cold water is repeated in the heat source side pipe (1).

On the other hand, in the utilization side circuit (2), the refrigerant circulates as the pump (5) is driven. That is, the liquid refrigerant discharged from the pump (5) flows into each indoor unit (6), is decompressed by the electric expansion valve (EV), and then is introduced into the indoor heat exchanger (9). Here, the liquid refrigerant exchanges heat with the room air to evaporate, and reaches the second heat transfer pipe (4b) of the heat source side heat exchanger (4) through the gas pipe (8). The indoor air that has exchanged heat with the refrigerant that evaporates in each indoor unit (6) is cooled, thereby cooling the room. The gas refrigerant reaching the second heat transfer tube (4b) of the heat source side heat exchanger (4) exchanges heat with the cold water flowing through the first heat transfer tube (4a) of the heat source side heat exchanger (4). Then, it is condensed and becomes a liquid refrigerant and returns to the pump (5). Such a circulating state of the refrigerant is repeated in the use side circuit (2), and the room is continuously cooled.

FIG. 2 is a circuit on the use side during the main cooling operation.
FIG. 4 is a Mollier diagram showing the refrigerant circulation state in (2). In this figure, a is the discharge part of the pump (5), b is the outlet of the electric expansion valve (EV), c is the outlet of the indoor heat exchanger (9), and d is the d.
Is the inlet portion of the second heat transfer tube (4b) of the heat source side heat exchanger (4),
Reference characters e denote the outlet portions of the second heat transfer tubes (4b).

As can be seen from this Mollier diagram, in the user side circuit (2), the driving force for circulating the refrigerant (input to the pump) is relatively small, and as in the conventional case, this user side Unlike the case where the circuit is provided with a refrigeration circuit, it is not necessary to compress the refrigerant to such an extent that the refrigerant has a superheat degree, and the operating efficiency is high. FIG. 3 shows a general Mollier diagram when a vapor compression refrigeration circuit is provided in the utilization side circuit. In this diagram, a is the discharge portion of the compressor, b is the outlet portion of the condenser (corresponding to the second heat transfer pipe (4b) in this embodiment), c is the outlet portion of the electric expansion valve, and d is the evaporation portion. The outlet portions of the units (corresponding to the indoor heat exchanger (9) in this embodiment) are shown. In this diagram, d to a indicate the input of the compressor, and it is necessary to compress the refrigerant to the extent that a large degree of superheat is generated. On the other hand, in the case of the present embodiment shown in FIG. 2, it is only necessary to increase the pressure of the refrigerant in the liquid phase to the pressure necessary for circulation, and the pump input is small, so that highly efficient operation is realized. You can

Further, the problems such as those in which the conventional air handling unit and fan coil unit are installed are solved. That is, unlike the air handling unit, it is not necessary to circulate the air between the heat exchanger on the heat source side and the room by the air duct, so that a large transfer power is not required and the transfer power is obtained. No need for a machine room. Therefore, it is possible to reduce running costs and capital investment. On the other hand, in the case of this embodiment, unlike the fan coil unit, the water pipe is not extended to the inside of the room, so there is no concern of water leakage, and periodical water leakage inspection or the like is unnecessary.

(Second Embodiment) Next, a second embodiment will be described in which a pump is used in the circulation circuit on the use side and the air conditioner is exclusively used for heating. The circuit configuration of the air conditioner according to this example is substantially the same as that of the first embodiment described above. Therefore, here, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 4, the system of this embodiment also
It comprises a heat source side pipe (1) and a utilization side circuit (2).

The heat source side pipe (1) includes a hot water supply pipe (1C) and a hot water recovery pipe (1D) extending from a heat source plant (not shown). The other structure of the heat source side pipe (1) is the same as that of the first embodiment described above. That is, hot water (for example, 60%) generated in the heat source plant and flowing through the hot water supply pipe (1C)
Part of the temperature is divided into the branch line (3) and the first heat transfer tube (4a)
After that, it is collected in the hot water recovery pipe (1D).
Further, as the heat source side pipe (1), steam may flow instead of hot water.

On the other hand, the utilization side circuit (2) is a heat source side heat exchanger.
The second heat transfer pipe (4b) of (4), the pump (5), and the plurality of indoor units (6, 6, ...) Are connected by a liquid pipe (7) and a gas pipe (8) so that the refrigerant can circulate. The pump (5) of this embodiment supplies the refrigerant from the liquid side of the indoor units (6, 6, ...) To the second heat transfer pipe (4b) of the heat source side heat exchanger (4).
Further, the motor-operated valve (EV) of the indoor unit (6, 6, ...) Of this embodiment functions as a flow rate adjusting valve. That is, also in the use side circuit (2) of this embodiment, as in the case of the above-described first embodiment, the circulation of the refrigerant accompanying the driving of the pump (5) causes the heat source side heat exchanger (4) to operate. Indoor heat exchanger
The heat transfer is performed between (9).

Next, the operation state (heating operation state) of the system in this embodiment will be described. In the heat source side pipe (1), the hot water generated in the heat source plant flows through the hot water supply pipe (1C). A part of this hot water flows through the branch line (3) through the first heat transfer pipe (4a) of the heat source side heat exchanger (4), and then is recovered by the hot water recovery pipe (1D) and returned to the heat source plant. Such a circulation state of hot water is repeated in the heat source side pipe (1).

On the other hand, in the utilization side circuit (2), the refrigerant circulates as the pump (5) is driven. That is, the liquid refrigerant discharged from the pump (5) is the second heat transfer pipe (4b) of the heat source side heat exchanger (4).
Flow into the first heat transfer tube (4a) and exchange heat with the hot water flowing through the first heat transfer tube (4a) to evaporate. Then, this gas refrigerant flows into each indoor unit (6) through the gas pipe (8), and is heat-exchanged with the indoor air in the indoor heat exchanger (9) to be condensed.
At this time, the room air that has exchanged heat with the condensing refrigerant is heated, thereby heating the room. The liquid refrigerant that has passed through the indoor heat exchanger (9) returns to the pump (5) through the liquid pipe (7). Such a circulating state of the refrigerant is repeated in the utilization side circuit (2).

FIG. 5 is a Mollier diagram showing the state of refrigerant circulation in the use side refrigerant circuit (2) during the main heating operation.
In this figure, a is the discharge part of the pump (5), and b is the second heat transfer tube (4
The outlet part of b), c is the inlet part of the indoor heat exchanger (9), d is the inlet part of the indoor heat exchanger (9), e is the outlet part of the flow control valve (EV), Symbols f respectively indicate suction portions of the pump (5).

As can be seen from the Mollier diagram, in the use side circuit (2), as in the case of the above-described first embodiment, the driving force for circulating the refrigerant (input to the pump).
Is relatively small (the refrigerant needs to be pressurized in the liquid phase to the pressure necessary for circulation), and the degree of superheat of the refrigerant is the same as in the conventional case where a refrigeration circuit is provided in this usage side circuit. It does not need to be attached and has high operating efficiency. Further, also in the present embodiment, the same effects as those obtained by installing the air handling unit and the fan coil unit described in the first embodiment can be exhibited.

(Third Embodiment) Next, a third embodiment in which the conveying means for obtaining the circulation driving force for the refrigerant in the use side circuit (2) is improved will be described with reference to FIGS. In this embodiment, the heat source side pipe (1) is a pair of pipes (1) for supplying and collecting cold water as the low temperature side pipe.
A) and (1B), and a pair of pipes (1C) and (1D) for supplying and recovering hot water as high temperature side pipes are provided, and the heat exchange with them switches between indoor cooling operation and heating operation. A case where it is configured as a cooling / heating air conditioner enabled will be described. The same members as those in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.

First, the first heat transfer tube (4) of the heat source side heat exchanger (4)
The connection state between a) and the heat source side pipe (1) will be described. As shown in FIG. 6, the first heat transfer tube (4a) of the heat source side heat exchanger (4)
The branch line (3) connecting the heat source side pipe (1) and the heat source side pipe (1) is connected to each pipe (1A via a pair of three-way valves (31), (32) as switching means.
It is possible to switch the connection status to ~ 1D). Specifically, one end of the first heat transfer pipe (4a) can switch the connection state to the cold water supply pipe (1A) and the hot water supply pipe (1C) via the first three-way valve (31). There is. On the other hand, the first heat transfer tube (4
The other end of a) is the cold water recovery pipe (1B) via the second three-way valve (32).
Also, it is possible to switch the connection status to the hot water recovery pipe (1D). In the state where each three-way valve (31) is switched to the solid line side in the figure, one end of the first heat transfer pipe (4a) is the cold water supply pipe (1A).
Then, the other end is connected to the cold water recovery pipe (1B). That is, the cold water is supplied to the first heat transfer tube (4a). On the contrary, when each three-way valve (31) is switched to the broken line side in the figure, one end of the first heat transfer pipe (4a) is the hot water supply pipe (1C).
Then, the other end is in a state of being connected to the hot water recovery pipe (1D). That is, the hot water is supplied to the first heat transfer tube (4a).

Next, a driving force generating circuit which constitutes the conveying means.
(5) will be explained. This driving force generation circuit (5) is connected to the liquid pipe (7) of the utilization side circuit (2) via a four-way switching valve (10). The driving force generation circuit (5) includes a heat absorbing part (11a) of the circulation heater (11) as a pressurizing means, a heat radiating part (12a) of the circulation cooler (12) as a depressurizing means, and a tank. The first and second main tanks (T1, T2) as means, a sub-tank (ST), and a heater (13) for heating the liquid refrigerant extruded from the main driving force generation circuit (5) to the liquid pipe (7). ) Endotherm (13
a) The heat dissipating portion (14a) of the cooler (14) for cooling the refrigerant recovered from the liquid pipe (7) to the driving force generation circuit (5) is provided.

More specifically, a gas supply pipe (21) is connected to the upper end of the heat absorbing part (11a) of the circulation heater (11). The gas supply pipe (21) is branched into three branch pipes (21a to 21c), each of which is individually connected to the upper ends of the main tanks (T1, T2) and the sub-tanks (ST). Each of these branch pipes
(21a to 21c) include the first to third tank pressurizing solenoid valves (SV-P1
~ SV-P3) is provided. In addition, this circulation heater (1
One end of a liquid recovery pipe (22) is connected to the lower end of the heat absorbing part (11a) of 1). The other end of this liquid recovery pipe (22) is connected to the sub tank (S
It is connected to the lower end of T). The liquid recovery pipe (22) has a check valve (C) that allows only the outflow of the refrigerant from the sub tank (ST).
V-1) is provided.

On the other hand, a gas recovery pipe (25) is connected to the upper end of the heat dissipation part (12a) of the circulation cooler (12). The gas recovery pipe (25) is also branched into three branch pipes (25a to 25c) and connected to the branch pipes (21a to 21c) of the gas supply pipe (21), respectively. T1, T2) and sub tank (S
It is connected individually to the upper end of T). Each of these branch pipes (25a
25c), the first to third tank pressure reducing solenoid valves (SV-V1 to SV
-V3) is provided. A liquid supply pipe (26) is connected to the lower end of the circulation cooler (12). This liquid supply pipe (26) is branched into two branch pipes (26a, 26b), each of which is individually connected to the lower end of each main tank (T1, T2). These branch pipes (26a, 26b) have main tanks (T1, T
2) Non-return valve (CV-2, CV-2) that allows only the flow of refrigerant toward
Is provided.

Each main tank (T1, T2) is installed at a position lower than that of the circulation cooler (12). Further, the sub tank (ST) is installed at a position higher than the circulation heater (11).

The liquid extruding pipe (27) is connected to the upper end of the heat absorbing portion (13a) of the heater (13). This liquid extrusion tube (2
7) is branched into two branch pipes (27a, 27b) and connected to the branch pipes (26a, 26b) of the liquid supply pipe (26), respectively, so that the main tanks (T1, T2) It is individually connected to the lower end. Each of these branch pipes (27a, 27b) has a main tank (T
A check valve (CV-3, CV-3) is provided which allows only the refrigerant flow from 1, T2) to the heater (13). The liquid pushing pipe (27) and the liquid collecting pipe (22) are connected by a liquid dividing pipe (28). The liquid distribution pipe (28) is provided with a check valve (CV-4) that allows only the refrigerant flow from the liquid extrusion pipe (27) to the sub tank (ST). Meanwhile, heater (13)
The lower end of the heat absorbing part (13a) is connected to the four way switching valve (10). In the state where the four-way switching valve (10) is switched to the solid line side in the figure, while the liquid refrigerant extruded from the main tank (T1, T2) is supplied to the liquid side of the indoor unit (6), The liquid refrigerant extruded from the main tanks (T1, T2) is supplied to the second heat transfer pipe (4b) of the heat source side heat exchanger (4) when switched to the middle broken line side. .

A liquid suction pipe (29) is connected to the upper end of the heat radiating portion (14a) of the cooler (14). This liquid suction tube (29) has 2
By branching into two branch pipes (29a, 29b) and connecting them to the branch pipes (27a, 27b) of the liquid extruding pipe (27), respectively, the lower ends of the main tanks (T1, T2) are individually Connected.
Each of these branch pipes (29a, 29b) has a check valve that allows only the refrigerant flow from the cooler (14) to the main tanks (T1, T2).
(CV-5, CV-5) is provided. On the other hand, the lower end of the heat radiating portion (14a) of the cooler (14) is connected to the four way switching valve (10). When the four-way switching valve (10) is switched to the solid line side in the figure, the second heat transfer pipe (4) of the heat source side heat exchanger (4) is
While the liquid refrigerant is recovered from b), the liquid refrigerant is recovered from the indoor unit (6) in the state where the liquid refrigerant is switched to the broken line side in the figure.

Next, the drive source circuit (40) for generating the circulating drive force of the refrigerant in the drive force generation circuit (5) will be described.

The drive source circuit (40) includes a compressor (41), a heat radiating portion (11b) of the circulation heater (11), and a heat radiating portion of the heater (13).
(13b), the electric expansion valve (42), the heat absorbing part (14b) of the cooler (14), the heat absorbing part (12b) of the circulation cooler (12), which are connected by the refrigerant pipe (43). Made of That is, the compressor
While driving the (41), heat is given to the refrigerant of the driving force generation circuit (5) in the circulation heater (11) and the heater (13),
The cooler (14) and the circulation cooler (12) are configured to remove heat from the refrigerant in the driving force generation circuit (5).

The above is the configuration of the refrigerant circuit of the air-conditioning apparatus according to the present embodiment.

-Cooling Operation- Next, the indoor cooling operation operation will be described. During this operation, first, the three-way valves (31, 32) and the four-way switching valve (10) are switched to the solid line side in the figure. Also, each motorized valve (EV, 42)
Is adjusted to a predetermined opening degree. Furthermore, the first main tank (T1)
Pressurizing solenoid valve (SV-P1), sub tank (ST) pressurizing solenoid valve (SV-P1)
V-P3) and the pressure reducing solenoid valve (SV-V2) of the second main tank (T2) are opened. On the other hand, pressurized solenoid valve for the second main tank (T2)
(SV-P2), pressure reducing solenoid valve (SV-V1) of the first main tank (T1)
, The pressure reducing solenoid valve (SV-V3) of the sub tank (ST) is closed.

In this state, the drive source circuit (40)
As shown by the solid arrow in FIG. 7, the high-temperature and high-pressure gas refrigerant discharged from the compressor (41) is used as a circulation heater (11) and a heater (13).
At, the refrigerant in the driving force generation circuit (5) is heated and condensed. The condensed refrigerant is decompressed by the electric expansion valve (42), and then, in the cooler (14) and the circulation cooler (12), heat is taken from the refrigerant in the driving force generation circuit (5) to be evaporated. afterwards,
The evaporated refrigerant is sucked into the compressor (41). Such circulation operation is repeated.

By exchanging heat with the circulation heater (11) and the circulation cooler (12), a high pressure due to the evaporation of the refrigerant is generated in the heat absorption section (11a) of the circulation heater (11). At the heat dissipation part (12a) of the circulation cooler (12), a low pressure is generated as the refrigerant is condensed. Therefore, in the driving force generation circuit (5),
The internal pressure of the first main tank (T1) and the sub tank (ST) becomes high (pressurizing operation), and conversely, the internal pressure of the second main tank (T2) becomes low (depressurizing operation). As a result, the liquid refrigerant extruded from the first main tank (T1) is heated by the heater (13), the four-way switching valve (10), and the liquid piping as shown by the broken line arrow in FIG.
After passing through the branch pipe (7a) of (7), the pressure is reduced by the electric expansion valve (EV, EV, EV), and heat is exchanged with the indoor air in the indoor heat exchanger (9, 9, 9). Evaporate to cool room air. afterwards,
This refrigerant, through the gas pipe (8), the heat source side heat exchanger (4)
Heat exchange with the cold water supplied from the heat source side pipe (1) to condense, and the liquid pipe (7), four-way switching valve (10), cooler (1
It is recovered in the second main tank (T2) via 4). Further, the liquid refrigerant condensed in the circulation cooler (12) is introduced into the second main tank (T2) through one branch pipe (26b) of the liquid supply pipe (26).

On the other hand, the sub tank (ST) is a circulation heater (11).
Since the pressure is equalized with the heat absorption part (11a) of the sub-tank (11a), the liquid refrigerant in the sub-tank (ST) passes through the liquid recovery pipe (22) and the circulation heater (11a) as shown by the dashed line arrow in FIG. ) Is supplied to the heat absorption part (11a). The supplied liquid refrigerant evaporates in the heat absorbing part (11a) and contributes to pressurization in the first main tank (T1).
After that, most of the liquid refrigerant in this sub-tank (ST) is in the heat absorption part.
When it is supplied to (11a), the pressure solenoid valve (S) of the sub tank (ST) is
V-P3) is closed and the pressure reducing solenoid valve (SV-V3) of the sub tank (ST) is opened. This allows the sub tank (ST)
The inside becomes low pressure, as shown by the two-dot chain line arrow in FIG.
Part of the liquid refrigerant flowing through the liquid extruding pipe (27) is a liquid diversion pipe.
Recovered via (28).

After performing such an operation for a predetermined time, the solenoid valve of the driving force generating circuit (5) is switched. That is, the pressurizing solenoid valve (SV-P1) of the first main tank (T1), the second main tank
Close the pressure reducing solenoid valve (SV-V2) of (T2) and the pressure reducing solenoid valve (SV-V3) of the sub tank (ST). Pressurizing solenoid valve (SV-P2) of the second main tank (T2), depressurizing solenoid valve (SV-P2) of the first main tank (T1)
V1), open the pressure solenoid valve (SV-P3) of the sub tank (ST).

As a result, the internal pressure of the first main tank (T1) becomes low, and conversely, the internal pressures of the second main tank (T2) and the sub tank (ST) become high. Therefore, the liquid refrigerant extruded from the second main tank (T2) circulates in the same manner as described above and is collected in the first main tank (T1) in a refrigerant circulation state, and the liquid refrigerant in the sub tank (ST) is in a circulating state. Is a circulation heater (1
It is supplied to the heat absorbing part (11a) of 1). Also in this case, when most of the liquid refrigerant in the sub tank (ST) is supplied to the heat absorbing part (11a), the pressurizing solenoid valve (SV-P3) of the sub tank (ST) is closed and the sub tank ( The pressure reducing solenoid valve (SV-V3) of ST) is opened, and the refrigerant is collected in the sub tank (ST).

By repeating the switching operation of each solenoid valve as described above, the refrigerant is circulated in the driving force generating circuit (5), and the room is continuously cooled.

Further, the drive source circuit (40) includes a drive source heater.
(11) heat dissipation part (11b) and drive source cooler (12) heat absorption part (12
In addition to b), the heat radiating part (13b) of the heater (13) and the heat absorbing part (14b) of the cooler (14) are provided to exchange heat with the refrigerant of the driving force generation circuit (5). There is. That is, in the heater (13), the surplus heat in the drive source circuit (40) can be released to the refrigerant in the drive force generation circuit (5). Therefore, even if there is a difference between the amount of heat exchanged in the circulation heater (11) for high pressure generation and the amount exchanged in the circulation cooler (12) for low pressure generation, the heater It is possible to absorb this difference by heat exchange in (13), it is possible to match the heat balance of the drive source circuit (40) as a whole, and the refrigerant circulation operation in the drive source circuit (40). Can be done smoothly. Also a cooler
In (14), the refrigerant recovered in the main tanks (T1, T2) is cooled, so in the situation where the gas refrigerant is recovered in the main tanks (T1, T2), the cooling of this gas refrigerant is performed. As a result, the refrigerant can be liquefied and only the liquid refrigerant can be collected in the main tanks (T1, T2). Therefore, it is possible to avoid a situation in which the amount of the liquid refrigerant in the main tanks (T1, T2) becomes small and the operation of extruding and collecting the liquid refrigerant from the driving force generating circuit (5) is hindered.

-Heating operation-On the other hand, during the indoor heating operation, the three-way valves (31, 32) and the four-way switching valve (10) are switched to the broken line side in the figure. The other states of the motor-operated valves and the solenoid valves are substantially the same as those during the cooling operation described above.

Due to the transfer of heat in the circulation heater (11) and the circulation cooler (12) similar to the above, a high pressure is generated inside one main tank (T1) and a low pressure is generated inside the other main tank (T2). The liquid refrigerant extruded from one of the main tanks (T1) is heated by the heater (1
After passing through 3), the four-way switching valve (10), and the liquid pipe (7), in the second heat transfer pipe (4b) of the heat source side heat exchanger (4), the hot water supplied from the heat source side pipe (1) Heat is exchanged between them to evaporate. After that, this gas refrigerant is passed through the gas pipe (8) and each indoor unit (6,
In the indoor heat exchanger (6, 6), heat is exchanged with the indoor air and condensed to heat the indoor air. After that, this refrigerant flows through the branch pipe (7a) of the liquid pipe (7) and the four-way switching valve.
(10), through the circulation heater (11), the other main tank (T2)
Will be collected. The subsequent operation (switching operation of the tank pressurizing solenoid valve, the tank depressurizing solenoid valve, etc.) is the same as that in the case of the cooling operation described above, and therefore description thereof is omitted.

As described above, according to this embodiment, the driving force is generated by the heat exchange between the refrigerant circulating in the driving source circuit (40) and the refrigerant circulating in the driving force generating circuit (5). circuit
Main tank by heating and cooling the refrigerant in (5)
The refrigerant is extruded and collected from (T1, T2), and thereby the circulation driving force of the refrigerant in the utilization side circuit (2) is obtained. Therefore, the same effects as those of the above-described first and second embodiments can be obtained, and the refrigerant circulation with higher efficiency and higher reliability than those using the mechanical pump as in these embodiments. The action can be performed.

In this embodiment, the heat source side pipe (1) is composed of four pipes, and the present invention is applied to an air conditioner capable of switching between indoor cooling and heating. When (1) is composed of two pipes (a pipe for hot water or a pipe for cold water), it is configured as a cooling only machine or a heating only machine. Also in this case, it is possible to obtain the refrigerant circulation driving force in the utilization side circuit by utilizing the pressure change due to the phase change of the refrigerant in the driving force generation circuit (5).

(Fourth Embodiment) Next, a fourth embodiment in which the conveying means for obtaining the circulation driving force for the refrigerant in the use side circuit (2) is improved will be described with reference to FIG. In the present embodiment, instead of the drive source circuit (40) of the third embodiment described above, cold water and hot water in the heat source side pipe (1) are used to obtain the refrigerant circulation drive force. Therefore, here, only the differences from the third embodiment will be described.

As shown in FIG. 9, the circuit of this embodiment does not include the drive source circuit composed of the refrigeration circuit as described above. Hot water piping (50) and cold water piping instead of this drive source circuit
It is equipped with (51). The hot water pipe (50) is the circulation heater (11).
It is for supplying hot water to the heat radiation part (11b) of the. Specifically, the heat dissipation part (11b) of the circulation heater (11) has one end connected to the hot water supply line (50a) to the hot water supply pipe (1C) and the other end connected to the hot water recovery line (50b) to the hot water recovery pipe (50b). 1D), respectively. The hot water supply line (50a) is provided with an electric expansion valve (52) for adjusting the hot water supply amount.

On the other hand, the cold water pipe (51) is connected to the heat absorbing part (12b) of the circulation cooler (12) and the cooler (1) by the pipes.
It is for supplying cold water to the heat absorbing portion (14b) of 4). Specifically, the heat absorption part (12b) of the circulation cooler (12) is connected to the cold water supply pipe (1A) by the cold water supply line (51a) and the cooler.
The heat absorbing section (14b) of (14) is connected to the cold water recovery pipe (1B) by a cold water recovery line (51b). Further, the cold water supply line (51a) is provided with an electric expansion valve (53) for adjusting the cold water supply amount.

In this circuit, there is no problem even if there is a difference between the heat exchange amount in the circulation heater (11) and the heat exchange amount in the circulation cooler (12). The heater (13) provided in the form circuit is not provided.

The above is the configuration of the refrigerant circuit of the air-conditioning apparatus according to the present embodiment.

Next, the operation of this circuit will be described. During the indoor cooling operation, the three-way valves (31, 32) and the four-way switching valve (10) are switched to the solid line side in the figure. On the other hand, during indoor heating operation, each three-way valve (31, 32) and four-way switching valve (1
0) is switched to the broken line side in the figure. Also, hot water piping (50)
And the electric expansion valves (52, 53) provided in the cold water pipe (51) are opened together so that the heat exchange amount in the heaters (11, 13) and cooler (14) is set appropriately. The opening is adjusted.

As a result, in the circulation heater (11), the refrigerant in the driving force generation circuit (5) is heated, and the circulation cooler (12) is heated.
In that case, the refrigerant in the driving force generation circuit (5) is cooled. Thus, as in the case of the third embodiment described above, by applying a high pressure to one main tank (T1) and a low pressure to the other main tank (T2), the refrigerant in the use side circuit (2) The circulation driving force of is obtained. As a result, the same refrigerant circulation operation as in the case of the third embodiment described above is performed, and the room is cooled or heated.

As described above, according to the configuration of the present embodiment, the refrigerant circulation driving force in the use side circuit (2) is obtained by utilizing the heat quantity of the hot water and the cold water flowing through the heat source side pipe (1). Therefore, the refrigerating circuit as in the third embodiment is unnecessary, and the efficiency can be further improved.

In each of the above-described embodiments, the case where the invention is applied to the air conditioner has been described, but the present invention is not limited to the air conditioner and can be applied to other refrigeration systems.

Further, in the third embodiment, the refrigerating circuit provided with the compressor is used to obtain the refrigerant circulation driving force, but the present invention is not limited to this, and the driving force generating circuit (5) is heated or cooled. However, a boiler or an absorption refrigerator can be applied.

[0086]

As described above, according to the present invention, the following effects are exhibited. The invention according to claim 1 uses a circulation circuit (2) for a refrigerant with a phase change as a circuit that utilizes the heat of a heat source medium supplied from a heat source facility, and circulates the refrigerant on the liquid side of this circuit (2). I tried to get the driving force. Therefore, the user side refrigerant circuit (2) needs to boost the refrigerant in the liquid phase to the pressure necessary for circulation, and the input for obtaining this circulation driving force (for example, power consumption when a mechanical pump is used). Is less. Therefore, highly efficient operation can be realized. Further, it is possible to solve problems such as those in which a conventional air handling unit or fan coil unit is installed. That is, unlike the air handling unit, it is not necessary to circulate the air between the heat exchanger on the heat source side and the room by the air duct, so that a large transfer power is not required and the transfer power is obtained. No need for a machine room. Therefore, it is possible to reduce running costs and capital investment.
Further, unlike the fan coil unit, the water pipe is not extended to the inside of the room, so there is no concern about water leakage, and periodical water leakage inspection or the like is unnecessary.

The invention according to claim 1 is the driving force.
Push the liquid refrigerant from the generating circuit (5) into the user side refrigerant circuit (2)
Liquid cooling of the driving force generation circuit (5) by the driving refrigerant.
Pressurizing means (11) for generating a high pressure by heating the medium,
The driving force generation circuit (5) absorbs the liquid refrigerant from the user side refrigerant circuit (2).
Driving force generation circuit that evaporates the driving refrigerant so that it pulls
Pressure reduction that produces low pressure by cooling the gas refrigerant in (5)
And means (12) . With this, the pressurizing means (11)
Utilizing the high pressure generated and the low pressure generated by the pressure reducing means (12)
It is possible to obtain the refrigerant circulation driving force in the user side refrigerant circuit (2).
The need to use mechanical means,
A high transportation means can be realized.

Furthermore, the driving force generating circuit (5) stores the liquid refrigerant.
It is equipped with tank means (T1, T2) that can stay
By applying a high pressure to the tank means (T1, T2)
Pressurizing operation to push out the liquid refrigerant from the stages (T1, T2) and cooling the refrigerant.
By applying a low pressure to the tank means (T1, T2).
By the decompression operation to recover the liquid refrigerant to the link means (T1, T2)
Refrigerant is circulated in the use side refrigerant circuit (2). This
Therefore, refrigeration is performed by circulating the refrigerant in the user-side refrigerant circuit (2).
It is possible to fully demonstrate the ability and
It is possible to improve.

According to the second aspect of the invention, the heat from the heat source equipment is used.
Was used for heating or cooling for transportation.
That is, the driving force generation circuit (5)
The high pressure generated by heating the liquid refrigerant
Connect the high temperature side pipe (1C) so that it is pushed out to the use side refrigerant circuit (2).
Heating side heat exchanger (11b) capable of heat exchange with high temperature fluid
And cooling the gas refrigerant in the driving force generation circuit (5)
The driving pressure of the liquid refrigerant in the user side refrigerant circuit (2) is generated by the low pressure
The low temperature flow of the low temperature side piping (1A) so that the raw circuit (5) can be sucked.
Equipped with a cooling side heat exchanger (12b) capable of exchanging heat with the body
Let For this reason, special heating or cooling means
Refrigerant circulation in the user side refrigerant circuit (2) without the need for
A ring driving force can be obtained, which simplifies the configuration and provides a heat source.
Practical use of the system by effectively utilizing the heat supplied from the equipment
It is possible to improve the sex.

According to the third aspect of the invention, the tank means are connected to each other.
First and second tank means (T1, T2) connected in parallel to
The liquid refrigerant is extruded from one of the tank means,
The liquid refrigerant was collected in the other tank means.
For this reason, the heat absorption or heat dissipation of the heat exchanger (9) on the usage side continues.
You can continue. Therefore, the present invention is suitable for air conditioners and the like.
When used, the air conditioning condition in the room can be improved for a long time.
Can be maintained.

The invention according to claim 4 is the same as claim 1 or 2.
In the district heating and cooling system described in 2, the heat exchange on the user side
The container (9) is made to absorb heat. Meanwhile, the contract
The invention described in claim 5 is the area described in claim 1 or 2 above.
In the heating / cooling system, heat is radiated to the heat exchanger (9) on the user side.
I am trying to make a work. Therefore, efficient heat absorption
Or it becomes possible to perform heat dissipation operation, especially in the room
Efficient when the present invention is used for internal cooling operation, etc.
Air conditioning operation can be realized.

The inventions according to claims 6 and 7 are the same as the above-mentioned claim 1.
Or, in the district heating and cooling system described in 2, the user side heat
It is possible to switch between heat absorption operation and heat dissipation operation of the exchanger (9).
ing. This improves the versatility of the system.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner according to a first embodiment.

FIG. 2 is a Mollier diagram showing a refrigerant circulation state in the use side circuit in the first embodiment.

FIG. 3 is a Mollier diagram showing a general refrigerant circulation state when the utilization side circuit is constituted by a vapor compression refrigeration circuit.

FIG. 4 is a view corresponding to FIG. 1 according to a second embodiment.

FIG. 5 is a view corresponding to FIG. 2 in the second embodiment.

FIG. 6 is a view corresponding to FIG. 1 according to a third embodiment.

FIG. 7 is a diagram showing a refrigerant circulation operation during a cooling operation in a third embodiment.

FIG. 8 is a diagram showing a refrigerant circulation operation during heating operation in the third embodiment.

FIG. 9 is a view corresponding to FIG. 1 according to a fourth embodiment.

[Explanation of symbols]

(1A) Cold water supply pipe (low temperature side pipe) (1C) Hot water supply pipe (high temperature side pipe) (2) User side piping (user side refrigerant circuit) (4) Heat source side heat exchanger (5) Pump, driving force generation circuit (transport means) (7) Liquid piping (8) Gas piping (9) Indoor side heat exchanger (use side heat exchanger) (11) Circulation heater (pressurizing means) (11b) Radiator (heating side heat exchanger) (12) Cooling device for circulation (pressure reducing means) (12b) Heat absorbing part (cooling side heat exchanger) (31., 32) 3-way valve (switching means) (40) Drive source circuit (T1, T2) Main tank (tank means)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-76331 (JP, A) JP-A-9-26229 (JP, A) International Publication 97/015789 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 5/00

Claims (7)

(57) [Claims] 1. In a district heating and cooling system in which a heat source medium is supplied from a heat source facility to a specific area and the heat of the heat source medium in the area is used, a use side refrigerant circuit (2) that uses the heat of the heat source medium is provided. ), The use-side refrigerant circuit (2) includes a heat source-side heat exchanger (4) for exchanging heat between a refrigerant circulating in the circuit (2) and a heat source medium, and a use-side heat exchanger (4). 9) and the heat exchangers (4), (9) are connected to each other through a gas pipe (8) through which a gas refrigerant flows.
And a liquid pipe (7) through which the liquid refrigerant flows to form a closed circuit, and the liquid pipe (7) of the above-mentioned use-side refrigerant circuit (2) contains the refrigerant of the use-side refrigerant circuit (2). the circulation and conveyance means for applying a driving force (5) is connected, conveying means capable of driving force generating circuit storing the liquid refrigerant (5)
The drive source circuit (40) is capable of heat exchange with the drive force generation circuit (5).
The driving source circuit (40) is capable of circulating the driving refrigerant,
Use the liquid refrigerant from the driving force generation circuit (5) above to use the side refrigerant circuit (2)
The driving force generation circuit is driven by the driving refrigerant so as to be pushed out.
Pressurizing hand that generates high pressure by heating the liquid refrigerant in (5).
The driving force is generated by the liquid refrigerant in the stage (11) and the use side refrigerant circuit (2).
Allow the drive coolant to evaporate so that it is drawn into the raw circuit (5).
Cooling the gas refrigerant in the driving force generation circuit (5) reduces the low pressure.
The driving force generation circuit (5) is equipped with a pressure reducing means (12) for generating a liquid, and a tank hand capable of storing liquid refrigerant.
Stages (T1, T2) are provided, and high pressure is applied to the tank means (T1, T2) by heating the refrigerant.
Pressurize to push out the liquid refrigerant from the tank means (T1, T2)
By operating and cooling the refrigerant, the tank means (T1, T2) is low
Apply pressure to recover the liquid refrigerant to the tank means (T1, T2)
The refrigerant is circulated in the user side refrigerant circuit (2) by the depressurizing operation.
A district heating and cooling system that is characterized by being adapted to 2. A heat source medium is supplied from a heat source facility to a specific area.
Land that has been supplied to use the heat of the heat source medium in the area
In the area heating and cooling system, the use side refrigerant circuit (2) for utilizing the heat of the heat source medium is provided,
The use-side refrigerant circuit (2) is configured so that the refrigerant and heat circulating in the circuit (2)
A heat source side heat exchanger (4) that exchanges heat with the source medium;
Side heat exchanger (9) and each of these heat exchangers.
Gas pipes (8) through which gas refrigerant flows between the converters (4) and (9)
And closed by connecting the liquid piping (7) through which the liquid refrigerant flows.
Circuit, and the liquid piping (7) of the user side refrigerant circuit (2) has the user side cooling circuit.
The transport means (5) that gives the circulating drive force to the refrigerant in the medium circuit (2) is
It is connected to the high temperature side piping (1C) and high temperature fluid supplying high temperature fluid from the heat source equipment.
And the low temperature side pipe (1A) for supplying the low temperature fluid is extended, the conveying means is constituted by the driving force generating circuit (5) , and the driving force generating circuit (5) is the liquid of the driving force generating circuit (5). Refrigerant
Due to the high pressure generated by heating, the liquid refrigerant is used side refrigerant
With the high temperature fluid in the high temperature side pipe (1C), push it out to the circuit (2).
Between the heating side heat exchanger (11b) that can exchange heat between
Due to the low pressure generated by cooling the gas refrigerant in the raw circuit (5)
Liquid refrigerant from the user side refrigerant circuit (2) to the driving force generation circuit (5)
Heat the low temperature side pipe (1A) with the low temperature fluid so that
It is equipped with a replaceable cooling side heat exchanger (12b), and the driving force generation circuit (5) has a tank hand that can store liquid refrigerant.
Stages (T1, T2) are provided, and high pressure is applied to the tank means (T1, T2) by heating the refrigerant.
Pressurize to push out the liquid refrigerant from the tank means (T1, T2)
By operating and cooling the refrigerant, the tank means (T1, T2) is low
Apply pressure to recover the liquid refrigerant to the tank means (T1, T2)
The refrigerant is circulated in the user side refrigerant circuit (2) by the depressurizing operation.
A district heating and cooling system that is characterized by being adapted to 3. The district heating / cooling system according to claim 1 or 2.
In the system, the tank means comprises first and second tubing connected in parallel with each other.
The first tank means (T1) is provided with a high pressure, and the second tank means (T1, T2) is provided.
The first pressure action operation for applying a low pressure to the stage (T2) and the first tank
To the second tank means (T2) while applying a low pressure to the means (T1)
Alternately switching between the second pressure action which gives high pressure,
During the first pressure action operation, the first tank means (T1) is vaporized.
When liquid refrigerant is supplied to the heat exchangers (9), (4)
From the heat exchangers (4) and (9), which are condensers, to the second tank means.
While collecting the liquid refrigerant in (T2), during the second pressure action operation
Is a heat exchanger (4) from the second tank means (T2) to be an evaporator.
A heat exchanger that serves as a condenser while supplying liquid refrigerant to (9)
Liquid refrigerant is collected from (9) and (4) to the first tank means (T1).
Circulates the refrigerant to absorb the heat in the heat exchanger (9)
Is a district heating and cooling system characterized by continuous heat dissipation . 4. The district heating / cooling system according to claim 1 or 2.
In the system, the use-side refrigerant circuit (2) uses a heat source-side heat exchanger (4)
Allow the liquid refrigerant to condense and evaporate in the use side heat exchanger (9).
The heat source medium is a gas refrigerant flowing through the heat source side heat exchanger (4).
Is a low temperature fluid, and the heat source side heat exchanger (4)
What condenses the refrigerant by exchanging heat between the body and the refrigerant
District heating and cooling system, characterized in that it is. 5. The district heating and cooling system according to claim 1 or 2.
In the system, the user side refrigerant circuit (2) uses the heat source side heat exchanger (4) to vaporize the liquid refrigerant.
So that the gas refrigerant condenses in the heat exchanger (9) on the use side.
Therefore , the heat source medium is less than the liquid refrigerant flowing in the heat source side heat exchanger (4).
A high temperature fluid, the heat source side heat exchanger (4)
To evaporate the refrigerant by exchanging heat between it and the refrigerant.
A district heating and cooling system characterized by being present. 6. The district heating and cooling system according to claim 1.
The high temperature side pipe (1C) that supplies high temperature fluid from the heat source equipment.
And the low temperature side piping (1A) for supplying low temperature fluid is extended.
In the use side refrigerant circuit (2), the heat source side heat exchanger (4)
In the first refrigerant circulation state to condense and the heat source side heat exchanger (4)
Switchable to the second refrigerant circulation state where liquid refrigerant evaporates
In the first refrigerant circulation state, the heat source side heat exchanger (4)
Heat is generated between the flowing gas refrigerant and the low temperature fluid in the low temperature side pipe (1A).
A first switching state in which replacement is performed and a second refrigerant circulation state
The liquid refrigerant flowing through the heat source side heat exchanger (4)
Second switching to exchange heat with the hot fluid in the tube (1C)
A switching means (31, 32 ) capable of switching to the state is provided.
A district heating and cooling system characterized by 7. The district heating and cooling system according to claim 2.
In the use side refrigerant circuit (2), the heat source side heat exchanger (4)
In the first refrigerant circulation state to condense and the heat source side heat exchanger (4)
Switchable to the second refrigerant circulation state where liquid refrigerant evaporates
In the first refrigerant circulation state, the heat source side heat exchanger (4)
Heat is generated between the flowing gas refrigerant and the low temperature fluid in the low temperature side pipe (1A).
A first switching state in which replacement is performed and a second refrigerant circulation state
The liquid refrigerant flowing through the heat source side heat exchanger (4)
Second switching to exchange heat with the hot fluid in the tube (1C)
A switching means (31, 32) capable of switching to the state is provided.
A district heating and cooling system characterized by