JPH0792250B2 - Air conditioning equipment - Google Patents

Description

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

[Prior Art] 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, air cleanliness, and the like. 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.

The indoor air conditioner 101 is provided with evaporators 103 and 104. 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 in 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 such a conventional air conditioner, especially in the summer when the temperature of the outside air is high, the temperature difference between the outside air taken into the outdoor unit 102 and the ambient air in the indoor air conditioner 101 is small, and therefore the natural refrigerant circulation is performed. The cooling capacity of the circuit 105 is low and the operating rate of operation is low.

On the other hand, since the evaporator 104 of the compression type refrigeration circuit 106 housed in the indoor air conditioner 101 has a high temperature in the computer room throughout the summer and winter, it is used only for cooling the computer room throughout the summer and winter.

In the winter season, the condenser 111 of the refrigerant natural circulation circuit 105 and the condenser of the compression type refrigeration circuit 106, which are installed side by side with the outdoor unit 102
112 is used, and the heated outside air is only wasted outside the building.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to use a natural refrigerant circulation circuit to cool a computer room or the like and to cool or heat a building room by using a natural refrigerant circulation. To provide an air conditioner capable of improving the operation rate of a circuit, capable of heating and cooling with one outdoor unit, and further capable of proportionally heating and controlling the temperature of the outside air with the outdoor unit and supplying it to a building room. Is.

[Means for Solving the Problems]

In order to achieve the above object, the present invention has an outdoor unit that has a heating coil that uses hot water as a heat source and a cooling coil that uses cold water as a cold heat source, and that supplies outside air heated or cooled by these to a predetermined room. And a natural refrigerant circulation circuit having a condenser installed inside the outdoor unit and an evaporator located at a position lower than the condenser.

Then, it is preferable that a water sprayer is internally provided in the outdoor unit, and the water sprayer is located on the upstream side of the condenser.

[Work]

In the present invention, the refrigerant in the natural circulation circuit naturally circulates when the temperature of the outside air taken into the outdoor unit is lower than the temperature of the air around the evaporator, and the heat is released by the condenser in the outdoor unit. Then, the cooling and heating capacity of the refrigerant natural circulation circuit is determined in proportion to the temperature difference between the temperature of the outside air taken into the outdoor unit and the temperature of the air around the evaporator. Depending on the presence / absence of this cooling / heating capacity, it is divided into a case where the next refrigerant natural circulation circuit is operated and a case where it is not operated.

First, especially in the summer, when the temperature difference between the outdoor air in the outdoor unit and the air around the evaporator is smaller than the predetermined temperature difference, the refrigerant natural circulation circuit does not have the cooling / heating capacity and is not operated. In this case, the outside air taken into the outdoor unit is cooled by the cooling coil.

Secondly, especially in winter, when the temperature difference between the outside air in the outdoor unit and the ambient air around the evaporator is larger than the predetermined temperature difference, the refrigerant natural circulation circuit is operated with cooling and heating capacity. In this case, the outside air taken into the outdoor unit is
While being heated by the heating coil, it is also heated by the condensation heat of the condenser that constitutes the refrigerant natural circulation circuit. On the other hand, the air around it is cooled by the evaporator of the refrigerant natural circulation circuit.

〔Example〕

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

FIG. 1 to FIG. 3 show the contents of the air conditioning equipment according to the embodiment of the present invention, and the case of application to the cooling of a computer room and the heating and cooling of buildings will be described as an example.

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.
A condenser 6 that constitutes the refrigerant natural circulation circuit 3, a water sprayer 7 located upstream of the condenser 6, and a filter 8
, A humidifier 9 and a first blower 10 are built in, and the outside air heated or cooled is first fed by the first blower 10.
Supplied to a chamber (not shown). That is, the outdoor unit 1
Has a structure in which a condenser 6 that constitutes the refrigerant natural circulation circuit 3 and a water sprayer 7 are internally provided in a conventional normal outdoor unit having a heating coil, a cooling coil, and the like.

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 refrigerant natural 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. By circulating the refrigerant, the return air heat is moved to the outdoor unit 1 due to 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, so the refrigerant natural circulation circuit 3 is It is not operated, the condenser 6 does not release heat, and the evaporator 6 also does not absorb the heat of vaporization in the return air.

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 to the computer room 20 by the action of the second blower 19, so that the computer room 20 is cooled.

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.

The following effects are produced in this embodiment.

Firstly, according to the air conditioning equipment having the above-mentioned configuration, the air conditioning equipment is provided with the condenser 6 of the refrigerant natural circulation circuit 3 in a conventional ordinary outdoor unit having a heating coil, a cooling coil and the like. Since it has an internal structure,
The room of the building can be cooled by the cooling coil 5 of the outdoor unit 1 in the summer. Also, in the winter season, the refrigerant natural circulation circuit 3
The evaporator 17 can cool the computer room 20 and the like, and the condenser 6 and the heating coil 4 of the refrigerant natural circulation circuit 3 can heat the first room. Therefore, the refrigerant natural circulation circuit 3 and one outdoor unit 1 are sufficient for cooling and heating the room such as a computer room and the room of the building, and the dedicated outdoor unit for cooling as in the conventional example can be eliminated. .

Secondly, in the winter, the outside air taken into the outdoor unit 1 can be preheated by the heat of condensation of the condenser 6, so that it is possible to prevent the cooling coil 5 from freezing, which is likely to occur in the conventional ordinary outdoor unit.

Thirdly, since the outdoor unit 1 has the heating coil 4 which uses hot water as a heat source, the temperature of the hot water can be easily adjusted, and the heating of the hot water can be controlled proportionally as compared with the conventional compression type refrigeration circuit. The outdoor unit 1 can proportionally control the temperature of the outside air to supply it to the building room.

Fourthly, since the outdoor unit 1 is provided with the water sprayer 7, 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, Even if the temperature difference between the outside air in the outdoor unit 1 and the return air in the evaporator 17 is less than or equal to a predetermined temperature difference even in the summer of temperature,
Corresponding to the case where the temperature difference is large, the refrigerant natural circulation circuit 3
Is driven. As a result, the annual operating period of the refrigerant natural circulation circuit 3 can be extended, and the operating rate of the refrigerant natural circulation circuit 3 operated can be improved. The reason 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 this embodiment, the outside air taken into the outdoor unit 1 is heated or cooled and supplied to the first chamber. However, as shown in FIG. The air supply duct 31 is connected, the exhaust duct 32 is connected in the middle of the intake duct 31, and the intake duct 31,
The exhaust duct 32 has a first damper 31A and a second damper 32A, respectively.
Is provided. The first damper 31A is closed, and the second damper 3
By opening 2A, the exhaust operation is performed, and the heated or cooled outside air is not used for cooling and heating of the first chamber, but can be used for other purposes.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

The air conditioner according to claim 1, wherein the air conditioner has a structure in which a conventional natural outdoor unit including a heating coil, a cooling coil, etc. is internally provided with a condenser of a refrigerant natural circulation circuit. Therefore, the room of the building can be cooled by the cooling coil of the outdoor unit, especially in the summer. Further, in the winter, the evaporator of the refrigerant natural circulation circuit can cool the computer room and the like, and the condenser and the heating coil of the refrigerant natural circulation circuit can heat the predetermined room. Therefore, the refrigerant natural circulation circuit and one outdoor unit are sufficient for cooling and heating the room such as a computer room and the room for buildings, and it is possible to eliminate the need for a dedicated outdoor unit for cooling as in the conventional example. Play.

In addition, since the outdoor unit has a heating coil that uses hot water as a heat source, it is possible to control the heating of the hot water proportionally compared to the conventional compression type refrigeration circuit, and therefore, the outdoor unit proportionally controls the temperature of the outside air. The effect that can be supplied to the building room.

In the air conditioning apparatus according to claim 2, since the water sprayer is provided inside the outdoor unit, the outside air taken into the outdoor unit can be humidified by the water spray from the water sprayer and the preheating from the condenser. Even if the temperature difference between the outside air in the outdoor unit and the air around the evaporator is less than or equal to the predetermined temperature difference even in the high temperature summer, the refrigerant natural circulation circuit is operated corresponding to the case where the temperature difference is large. As a result, it is possible to extend the annual operating period of the refrigerant natural circulation circuit and improve the operating rate of operation of the refrigerant natural circulation circuit.

[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 an explanatory view showing another method of using the outdoor unit of FIG. FIG. 5 is a piping diagram of a conventional air conditioning equipment. [Explanation of symbols of main parts] 1 ... outdoor unit 3 ... refrigerant natural circulation circuit 4 ... heating coil 5 ... cooling coil 6 ... condenser 7 ... water atomizer 17 ... evaporator.

Claims (2)

[Claims] 1. An outdoor unit that has a heating coil that uses hot water as a heat source and a cooling coil that uses cold water as a cold source, and that is provided in an outdoor unit and an outdoor unit that supplies outside air heated or cooled by a predetermined room And a refrigerant natural circulation circuit having an evaporator located at a position lower than the condenser. 2. The air conditioner according to claim 1, wherein a water sprayer is provided inside the outdoor unit, and the water sprayer is located upstream of the condenser.