JP2996493B2 - Cooling device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device, and more particularly, to a cooling device using outside air cooling.

[Conventional technology]

Conventionally, as one of the energy-saving methods of cooling for rooms with a lot of internal heat, such as computer rooms,
2. Description of the Related Art In winter, an air conditioner has been proposed in which a refrigerant natural circulation heat transfer device that moves indoor heat to the outside using cold external air is used in combination with a cooling device.

FIG. 2 shows an indoor unit of this type of air conditioner.
In this indoor unit, the circulation evaporator line 15 connected to the outside air condenser 13 arranged outdoors is formed in the room evaporator 11.

Then, the outside air condenser 13 can be effectively used only in winter when the temperature of the outside air is low, and because the cooling capacity of the outside air condenser 13 fluctuates depending on the state of the outside air, adjacent to the room evaporator 13, An auxiliary cold water coil 17 for circulating cold water is arranged.

[Problems to be solved by the invention]

However, in such an indoor unit of the conventional air conditioner, the auxiliary chilled water coil 17 is arranged, so that the chilled water must be brought to a place where it is difficult to bring the chilled water, such as a computer room. Machine for room evaporator 11
In addition, it is necessary to incorporate the auxiliary chilled water coil 17, and there is a problem that the device becomes large.

The present invention has solved the above-described problems, and can reliably use the cold heat of the outside air, and can sufficiently compensate for the insufficient cooling capacity without bringing cold water into the room, and It is an object of the present invention to provide a cooling device capable of reducing the size of an air conditioner.

[Means for solving the problem]

The cooling device according to the present invention is an evaporator that exchanges heat between the refrigerant that changes gas-liquid phase and room air, a condenser that exchanges heat between the refrigerant and a cold heat source from outside, and an outlet side of the condenser. A cooling system including a first pipe connecting one side of the evaporator and a second pipe connecting the other side of the evaporator and one side of the condenser; A third branch branched upward from the second pipeline and connected to the first pipeline.
A conduit, an outside air condenser arranged in the third conduit for exchanging heat between the refrigerant and the outside air, a pressure sensor arranged in the second conduit, and a cold heat source for supplying a cold source to the condenser. A source supply pipe, and a control valve disposed in the cold / heat source supply pipe to control the pressure in the second pipe line detected by the pressure sensor to a predetermined pressure. The condenser and the outside air condenser are arranged below the condenser and the outside air condenser, and the condenser and the outside air condenser are connected without passing through a switching valve.

(Operation)

In the cooling device of the present invention, at the time of cooling in summer or the like in which the temperature of the outside air is higher than the room temperature, a cooling source is supplied to the condenser from the outside, and the refrigerant flows into the evaporator through the first pipe, and The air in the room is cooled by the evaporative effect in the above, and flows into the condenser through the second pipe, where it is subjected to the heat exchange with the cold heat source and condensed, and naturally circulates in the first pipe, Is cooled.

At this time, the refrigerant inside the outside air condenser is in a gaseous state, and the temperature of the outside air is high, so the gaseous refrigerant is heated and expands, and stays at the upper part of the third pipe line due to its buoyancy. There is no circulation.

On the other hand, during cooling, such as in winter, when the temperature of the outside air is lower than the room temperature, for example, the supply of a cold heat source from the outside to the condenser is stopped, and the refrigerant in the liquid receiving tank evaporates through the first pipe. Into the outside air condenser, which receives the evaporating action to cool the air inside the room, flows into the outside air condenser through the third conduit, exchanges heat with the outside air, receives the condensing action, and thereafter, Natural circulation from the pipe to the first pipe is performed to cool the room.

During cooling, such as in the spring or autumn, when the temperature of the outside air is slightly lower than the room temperature, the refrigerant flows into the evaporator, and the refrigerant that evaporates and cools the air inside the room flows into the condenser and the outside air condenser. However, the condensation action in the outside air condenser is smaller than the evaporation action in the condenser. As a result, the pressure in the pipeline rises, but by the action of the control valve by the pressure sensor, a cold source is supplied to the condenser, and the shortage of the condensation action in the outside air condenser with respect to the evaporation action in the evaporator.
The condensing action takes place in the condenser and the pressure in the line is normal.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a cooling device according to the present invention. In the drawing, reference numeral 23 denotes, for example, a plurality of units for exchanging heat between indoor air and a refrigerant that changes in gas-liquid phase such as a CFC-based refrigerant. The evaporator (only one is shown) is shown.

Reference numeral 25 denotes a condenser for exchanging heat between the refrigerant and a cold source from the outside, and a cold source supply pipe 27 for supplying a cold source such as cold water from the outside is inserted into the condenser 25. ing.

By connecting the outlet side of the condenser 25 and one side of the evaporator 23,
A conduit 29 is formed.

A second pipe 33 is formed by connecting the other side of the evaporator 23 and one side of the condenser 25.

In this embodiment, a third conduit 37 is formed which branches upward from the second conduit 33 and is connected to the first conduit 29.

The third conduit 37 extends outdoors. An outdoor air condenser 39 for exchanging heat between the refrigerant and the outside air is disposed at a position above the condenser 25 in the third conduit 37 outdoors. ing.

In this embodiment, the evaporator 23 is disposed at a position sufficiently lower than the condenser 25. Also, the condenser 15
And the outside air condenser 39 are connected without passing through a switching valve. That is, there is no switching valve for switching between the condenser 25 and the outside air condenser 39.

Further, a pressure sensor 43 is disposed in the second conduit 33, and a pressure in the second conduit 33 detected by the pressure sensor 43 is controlled to a predetermined pressure in the cold / hot source supply pipe 27. Control valve 45 is disposed.

In the cooling device configured as described above, during cooling in summer or the like when the temperature of the outside air is higher than the room temperature, a cooling source such as cold water is supplied to the condenser 25 from the outside, and the refrigerant is supplied to the first pipeline.
The air flows into the evaporator 23 through the evaporator 23, receives the evaporative action, cools the air inside the room, and flows into the condenser 25 through the second pipe 33, where it exchanges heat with a cold heat source, and condenses. After that, the air naturally circulates through the first pipe 29 to cool the room.

On the other hand, at the time of cooling during winter, when the temperature of the outside air is lower than the room temperature, the refrigerant flows into the evaporator 23 through the first pipe 29, where it undergoes the evaporative action to cool the air inside the room. 2
From line 33 through a third line 37 into the outside air condenser 39,
Here, it exchanges heat with the outside air and receives a condensing action. After that, it naturally circulates from the pipe 37 to the first pipe 29 to cool the room.

Thus, in the cooling device configured as described above, the third pipe 37 is branched upward from the second pipe 33 to be connected to the first pipe 29, and the third pipe 37 is formed. 37, an outside air condenser 39 for exchanging heat between the refrigerant and the outside air is arranged, and furthermore, the evaporator 23 is arranged below the condenser 25 and the outside air condenser 39, so that the refrigerant is disposed without a liquid pump or the like. While naturally circulating air, it is possible to reliably use the cold heat of the outside air, sufficiently compensate for the insufficient cooling capacity without bringing cold water into the room, and reduce the size of the indoor unit. Become.

That is, in the cooling device configured as described above, the third pipe 37 branched upward from the second pipe 33 through which the refrigerant flows.
Since the outside air condenser 39 is disposed in the computer room or the like, it is possible to reliably use the cold heat of the outside air in a computer room or the like in winter when the outside air temperature is low.

In addition, in the evaporator 23, which is an indoor unit, there is no need to arrange a replenishing chilled water coil or the like, so that in a computer room or the like, it is possible to sufficiently compensate for the insufficient cooling capacity without bringing chilled water into the room. Thus, the size of the indoor unit can be reduced.

Furthermore, in the cooling device configured as described above, the evaporator 23 is disposed sufficiently below the condenser 25 and the outside air condenser 39, so that the refrigerant condensed in the outside air condenser 39 or the condenser 25 has gravity. The first pipeline 29
It is not necessary to dispose a liquid pump or the like in the apparatus.

In the cooling device configured as described above, when the outside air temperature is high and the liquefaction amount in the outside air condenser 39 is insufficient,
Since the pressure in the second conduit 33 does not decrease to a predetermined pressure, the control valve 45 is opened by the pressure sensor 43, and
The remaining refrigerant gas is liquefied by the cold water from 27, whereby the pressure in the second pipeline 33 is always maintained at a predetermined pressure, so that the room is reliably cooled even when the outside air temperature increases. It becomes possible.

Furthermore, in the cooling device configured as described above, when the outside air temperature is higher than a predetermined condensation temperature, the refrigerant gas in the outside air condenser 39 is heated and expanded, and the second pipe of the third pipe line is buoyant. Since it stays in the portion located above the passage 33, it is not necessary to arrange a special switching valve or the like in the third passage 37 or the second passage 33 or the like.

Further, by branching the third conduit 37 from the top of the second conduit 33, it becomes possible to make the flow of the refrigerant very smooth, and further, by increasing the piping diameter of this branch part, The effect of the gas flow rate of the refrigerant can be reduced.

Note that, in the above-described embodiment, an example in which heat is exchanged between the atmosphere and the refrigerant in the outside air condenser 39 has been described. However, the present invention is not limited to this embodiment. When the temperature of the atmosphere is relatively high, as in
Of course, cold water may be applied to the outside air condenser to exchange heat between the cold water and the refrigerant.

〔The invention's effect〕

As described above, according to the present invention, when the outside air temperature is lower than the room temperature, the outside air condenser is condensed according to the difference between the outside air temperature and the room temperature. The operation is performed, and the condensation operation is performed in the condenser by an external cold heat source in a manner to compensate for the shortage of the condensation operation. In other words, it is possible to use the cold generated from the outside air without exhaustion without connecting or disconnecting the outside air condenser depending on the outside air temperature.

On the other hand, when the outside air temperature is low, the refrigerant is heated and expanded in the outside air condenser, and stays in the upper part of the third pipeline due to its buoyancy and does not circulate in the pipeline, so that the outside air condenser is controlled. The circuit for cooling can be maintained without disconnecting with a valve.

Thus, according to the present invention, in any case, the outside air temperature is compared with the room temperature, and the automatic control for connecting or disconnecting the outside air condenser becomes unnecessary, and the pressure in the pipeline is detected. In this case, it is possible to cope with the problem only by controlling the amount of the cold heat source supplied to the condenser.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing an embodiment of the cooling device of the present invention. FIG. 2 is a piping diagram showing an indoor unit of a conventional cooling device. [Description of Signs of Main Parts] 23 ... Evaporator 25 ... Condenser 29 ... First line 33 ... Second line 37 ... Third line 39 ... Outside air condenser.

Continuation of the front page (72) Inventor Akiyuki Kawashima 1-48-8 Itabashi, Itabashi-ku, Tokyo 1404 Diapalace Itabashi 1404 (72) Inventor Satoshi Nakazawa 3-58-8, Kameido, Koto-ku, Tokyo 202 (56) References JP-A-1-174834 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24F 5/00 F25B 1/00 F25B 15/00 F25B 30/04

Claims (1)

(57) [Claims] 1. An evaporator for exchanging heat between a refrigerant that changes in gas-liquid phase and room air, a condenser for exchanging heat between the refrigerant and an external cold heat source, an outlet side of the condenser, and the evaporator. And a second pipe connecting the other side of the evaporator and one side of the condenser.
A pipe, a third pipe branched upward from the second pipe and connected to the first pipe, and an outside air arranged in the third pipe and exchanging heat between the refrigerant and outside air. A condenser, a pressure sensor disposed in the second conduit, a cold heat source supply pipe for supplying a cold heat source to the condenser, and a second heat sensor disposed in the cold heat supply pipe and detected by the pressure sensor. A control valve for controlling the pressure in the pipeline to a predetermined pressure, wherein the evaporator is disposed below the condenser and the outside air condenser, and the condenser is switched between the condenser and the outside air condenser. A cooling device characterized by being connected without passing through a valve.