JPH0792249B2 - Air conditioning equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioner capable of cooling a computer room or the like and cooling or heating a building room.

[Conventional technology]

Recently, there has been a demand for an air-conditioning facility that saves energy in a room such as a computer room that has high internal heat generation and that satisfies temperature and humidity conditions and air cleanliness. As one of the things that meet this demand, a natural refrigerant circulation circuit that moves the heat inside the room to the outside using low-temperature outside air is attached to the cooling and heating device to cool the computer room and the like and to cool and heat the building room. An air conditioning system that can be used has been developed. Here, the refrigerant natural circulation circuit is also referred to as a thermosiphon, and a heat exchanger provided indoors and outdoors is annularly connected by a refrigerant pipe, and a low boiling point refrigerant is sealed inside, so that the refrigerant natural The target air is indirectly cooled by circulation.

Examples of such air conditioning equipment include, for example, Shoukaisho 61-46350.
The one shown in Japanese Patent Publication is known (shown in FIG. 5).

As shown in the figure, in this air conditioning equipment, an indoor air conditioner 101 and an outdoor unit 102 are connected by refrigerant pipes 107 and 108.

Evaporators 103 and 104 are used together with the indoor air conditioner 101. The evaporator 103 is a component of the refrigerant natural circulation circuit 105, and the evaporator 104 is a component of the compression refrigeration circuit 106.

The indoor air conditioner 101 can indirectly cool the computer room (not shown) by using the heat of evaporation generated by the evaporators 103 and 104.

The outdoor unit 102 is provided with condensers 111 and 112. The condenser 111 is a component of the refrigerant natural circulation circuit 105, and the condenser 112 is a component of the compression refrigeration circuit 106.

The outdoor unit 102 radiates the condensation heat generated in the condensers 111 and 112.

[Problems to be Solved by the Invention]

In the conventional air conditioning equipment, the refrigerant natural circulation circuit 105
Even if the difference in height between the evaporator 103 and the condenser 111 is large, the refrigerant in the refrigerant natural circulation circuit 105 circulates. On the other hand, if the height difference between the evaporator 104 and the condenser 112 of the compression refrigeration circuit 106 is large, the compressor 110 needs to perform the action of discharging the refrigerant while covering the energy of this height difference. Therefore, if the height difference is equal to or larger than the predetermined value, the refrigerant does not circulate due to the restriction on the load of the compressor 110.

As described above, the refrigerant natural circulation circuit 105 and the compression type refrigeration circuit 1
When 06 and the air conditioning equipment are configured together, the outdoor unit 102 and the indoor air conditioner 101 are installed in the building because the height difference in installing the compression refrigeration circuit 106 is limited. It is necessary to limit the height difference between them.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide an air conditioning apparatus that eliminates the restriction of the height difference between an outdoor unit and an indoor air conditioner installed in a building. It is to be.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention has at least one of a heating coil having hot water as a heat source and a cooling coil having cold water as a cold heat source. It has an outdoor unit for supplying to one chamber and a cooling coil that uses cold water as a cold heat source. This cooling coil cools the return air from the second chamber and circulates it to the second chamber.
It is provided with an indoor air conditioner for supplying, a condenser installed in the outdoor unit, and a natural refrigerant circulation circuit having an evaporator installed in the indoor air conditioner at a position lower than the condenser. .

[Work]

In the present invention, the heating coil or cooling coil of the outdoor unit and the cooling coil of the indoor air conditioner independently have the function of heat exchange even if there is a large difference in height. And
The refrigerant in the natural circulation circuit is naturally circulated under the condition that the temperature difference between the outside air in the outdoor unit and the return air in the indoor air conditioner is more than a predetermined temperature difference, and the refrigerant in the outdoor unit is a condenser. The heat is released by the heat exchanger, and the heat is absorbed by the evaporator in the indoor air conditioner. Therefore, the refrigerant natural circulation circuit is divided into a case where it is operated and a case where it is not operated, depending on whether the temperature difference between the outside air in the outdoor unit and the return air in the indoor air conditioner is a predetermined temperature difference or more.

First, when the temperature difference between the outside air in the outdoor unit and the return air in the indoor air conditioner is less than or equal to a predetermined temperature difference, the refrigerant natural circulation circuit is not operated. In this case, the outside air in the outdoor unit is cooled by the cooling coil, while the return air circulated from the second chamber to the indoor air conditioner is cooled by the cooling coil.

Secondly, the refrigerant natural circulation circuit is operated when the temperature difference between the outside air in the outdoor unit and the return air in the indoor air conditioner exceeds a predetermined temperature difference.

In this case, the outside air taken into the outdoor unit is heated by its heating coil and, at the same time, is heated by the condensation heat of the condenser forming the refrigerant natural circulation circuit. on the other hand,
The return air circulated from the second chamber to the indoor air conditioner is cooled by the heat of vaporization of the evaporator that constitutes the cooling coil and the refrigerant natural circulation circuit.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show the contents of the air conditioning equipment according to the embodiment of the present invention.

As shown in FIG. 1, the outdoor unit 1 includes an indoor air conditioner 2
It is installed at a higher position. A refrigerant natural circulation circuit 3 is connected to the outdoor unit 1 and the indoor air conditioner 2. The details will be described below.

The outdoor unit 1 includes a heating coil 4 and a cooling coil 5.
The condenser 6, which constitutes the refrigerant natural circulation circuit 3, the water sprayer 7, the filter 8, the humidifier 9, and the first blower 10 are built in, and the outside air heated or cooled is the first
It is supplied to the first chamber (not shown) by the blower 10.

A boiler 12 is connected to the heating coil 4 via a first pipe 11 and is supplied with hot water.

A compression refrigerator 14 for exchanging heat at the end 13A of the second pipe 13 is connected to the cooling coil 5.
The cold water cooled by is supplied.

A third pipe 15 is connected to the water sprayer 7 and the humidifier 9 to supply tap water.

On the other hand, the indoor air conditioner 2 contains a cooling coil 16, an evaporator 17 that constitutes the refrigerant natural circulation circuit 3, a filter 18, and a second blower 19, and the cooled outside air is the second
It is supplied to the computer room (second room) 20 by the blower 19.

A compression refrigerator 22 that exchanges heat with the end portion 21A of the fourth pipe 21 is connected to the cooling coil 16, and cold water cooled by the compression refrigerator 22 is supplied.

The natural refrigerant circulation circuit 3 includes a condenser 6 housed in the outdoor unit 1, an evaporator 17 located in a position lower than the condenser 6 and housed in the indoor air conditioner 2, and an outlet 17B of the evaporator 17.
And a gas side refrigerant pipe 23 that connects the inlet 6A of the condenser 6 and
A liquid-side refrigerant pipe 24 that connects the inlet 17A of the evaporator 17 and the outlet 6B of the condenser 6 is used as a component, and between the evaporator 17, the condenser 6, the gas-side refrigerant pipe 23, and the liquid-side refrigerant pipe 24. The heat of the return air is moved to the outdoor unit 1 by circulating the refrigerant and by the temperature difference between the temperature of the return air from the computer room 20 and the temperature of the outside air.

Next, the operation of this embodiment will be described.

In the summer, the temperature of the outside air in the outdoor unit 1 is higher than the temperature of the return air in the indoor air conditioner 2, or the temperature difference between them is less than the predetermined temperature difference, and the refrigerant natural circulation circuit 3
Is not operated, heat is not released in the condenser 6, and heat of evaporation in the evaporator 17 is not absorbed in the atmosphere.

In this case, cold water is supplied from the second pipe 13 to the cooling coil 5 of the outdoor unit 1. The outside air is cooled by the cooling coil 5 and is supplied to the first chamber by the action of the first blower 10, so that the first chamber is cooled.

On the other hand, cold water is supplied to the cooling coil 16 of the indoor air conditioner 2 from the fourth pipe 21. The return air from the computer room 20 is cooled by the cooling coil 16, and is supplied again by the action of the second blower 19 to cool the computer room 20.

Then, in the winter, the temperature of the outside air in the outdoor unit 1 is low, the temperature of the return air in the indoor air conditioner 2 is high, and there is a temperature difference equal to or greater than a predetermined temperature difference. Therefore, the refrigerant natural circulation circuit 3 is operated.

In this case, the outside air taken into the outdoor unit 1 is heated by the heating coil 4 to which hot water is supplied from the first pipe 11 and is heated by the condensation heat of the condenser 6 that constitutes the refrigerant natural circulation circuit 3. . This heated outside air is
It is supplied to the first chamber by the action of the first blower 10, and the first chamber is heated. On the other hand, the return air that has circulated from the computer room 20 to the indoor air conditioner 2 is cooled by the cooling coil 16 and the evaporator 17 that constitutes the refrigerant natural circulation circuit 3. This cooled return air is supplied to the computer room 20 and cooled.

According to the above configuration, the outdoor unit 1 and the indoor air conditioner 2 are installed independently of each other, and have a function of heat exchange independently even if there is a large difference in height. Moreover, the heating coil 4 of the outdoor unit 1 and the condenser 6 of the refrigerant natural circulation circuit 3 function in cooperation with each other, and the cooling coil 16 of the indoor air conditioner 2 and the evaporator 17 of the refrigerant natural circulation circuit 3 cooperate with each other. Function.

Therefore, the compression type refrigeration circuit of the conventional example is replaced with the refrigerant natural circulation circuit 3
The outdoor unit 1 which has the same function as the
When installing the indoor air conditioner 2 in a building, it is possible to eliminate the restriction of the height difference between them, and consequently to increase the degree of freedom of installation.

Further, in winter, the outside air taken into the outdoor unit 1 can be preheated by the condensation heat of the condenser 6, so that the cooling coil 5 can be prevented from freezing.

Further, since the water sprayer 7 is built in the outdoor unit 1, the water sprayed from the water sprayer 7 and the preheat from the condenser 6 can humidify the outside air taken into the outdoor unit 1, and the outside air is high in temperature. The refrigerant natural circulation circuit 3 is operated even at the temperature, and the operation period can be extended.
The reason for this will be described below with reference to FIGS. 2 and 3.

First, in order for the refrigerant natural circulation circuit 3 to operate, the temperature of the outside air taken into the outdoor unit 1 needs to be lower than the temperature of the return air circulated in the indoor air conditioner 2 by a predetermined temperature difference. As shown in FIG. 2, when the maximum temperature of the outside air for operating the refrigerant natural circulation circuit 3 is, for example, 15 ° C., the frequency of the outside air below 15 ° C. (operating range A in the shaded area) is 49. %. When sprayed with water, as shown in Fig. 3, the outside air at the inlet of 15 ° C or higher is humidified and cooled, and the second
The refrigerant natural circulation circuit 3 can be operated up to the range of the lattice pattern area B in the figure. Therefore, the operation expansion range of the lattice pattern region B of 15 ° C. or more (the outside air frequency is 13%) is added, and the refrigerant natural circulation circuit 3 secures the annual operation range of the outside air frequency of 62%.

In addition, in the present embodiment, the outdoor unit 1 has the heating coil 4 and the cooling coil 5 built therein, but it is also possible to incorporate one of these.

FIG. 4 shows an air conditioning equipment according to another embodiment of the present invention.

As shown in the figure, two outdoor units 31, 31 and two indoor air conditioners 32, 32 are installed, and a natural refrigerant circulation circuit 33 is connected to these outdoor units 31, 31 and indoor air conditioners 32, 32. ing. The refrigerant natural circulation circuit 33 includes a condenser 34 housed in each outdoor unit 31 and an evaporator housed in each indoor air conditioner 32.
35, gas side refrigerant pipe 36, header gas side refrigerant pipe 37
And a liquid side refrigerant pipe 38 and a header liquid side refrigerant pipe 39. That is, the two outdoor units 31, 31 are connected via the header gas side refrigerant pipe 37 and the header liquid side refrigerant pipe 39.
And two indoor air conditioners 32, 32 are connected at the same time.

Therefore, in addition to the effects of the above-described embodiment, it is possible to install only one indoor air conditioner and one outdoor unit, or several indoor air conditioners and one outdoor unit. Then, two outdoor units and two indoor air conditioners are provided.
It has the effect that it can be installed individually.

In the present embodiment, the case where the number of outdoor units is two has been described, but the number of outdoor units may be three or more.

〔The invention's effect〕

As described above, according to the air conditioning apparatus of the present invention, the outdoor unit and the indoor air conditioner are installed independently, and even if there is a large difference in height, they have the function of heat exchange independently. There is. Moreover, the heating coil of the outdoor unit and the condenser forming the natural refrigerant circulation circuit work together, and the cooling coil of the indoor air conditioner and the evaporator forming the natural refrigerant circulation circuit work together.

Therefore, while having the same function as the compression refrigeration circuit of the conventional example is installed side by side with the refrigerant natural circulation circuit, it eliminates the restriction of the height difference in installing the outdoor unit and the indoor air conditioner in the building. As a result, there is an effect that the degree of freedom of installation can be increased.

[Brief description of drawings]

FIG. 1 is a piping diagram of an air conditioning equipment according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of the operation extendable range of the refrigerant natural circulation circuit by water spray on the wet air diagram. FIG. 3 is an explanatory diagram of changes in outside air due to water spray on the moist air diagram. FIG. 4 is a piping diagram of an air conditioning equipment according to another embodiment of the present invention. FIG. 5 is a piping diagram of a conventional air conditioning equipment. [Explanation of symbols of main parts] 1 ... outdoor unit 2 ... indoor air conditioner 3 ... refrigerant natural circulation circuit 4 ... heating coil 5 ... cooling coil 6 ... condenser 7 ... water sprayer 16 ... Cooling coil 17 …… Evaporator 20 …… Computer room (second room).

Claims (1)

[Claims] 1. At least one of a heating coil having hot water as a heat source and a cooling coil having cold water as a cold heat source, wherein the outside air heated or cooled by these is first.
An outdoor unit for supplying air to the room, a cooling coil using cold water as a cold heat source, an indoor air conditioner that cools the return air from the second chamber and circulates and supplies it to the second chamber, and an outdoor unit. And a refrigerant natural circulation circuit having an evaporator installed in an indoor air conditioner at a position lower than this condenser.