JP2002333237A - Heat transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat transfer device which can reduce a pressure loss of a refrigerant, enables the smooth execution of natural circulation of a refrigerant and prevention of scattering of condensate generated by an evaporator. SOLUTION: In the heat transfer device provided with a condenser 5 and the evaporator 9, interconnecting the condenser 5 and the evaporator 9 through a refrigerant liquid pipe 17 and a refrigerant gas pipe 19 and forming a natural circulation cycle, the evaporator 9 is provided with a header 23 on the liquid side in which refrigerant liquid flows; a header 25 on the gas side from which refrigerant gas flows out; and a plurality of straight pipes 27 intercoupling the two headers 23 and 25 and provided at the peripheries thereof with a plurality of fins 29. A water repellent filter 33 having air permeability is situated leeward of the evaporator 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device of a refrigerant natural circulation type.

[0002]

2. Description of the Related Art Generally, a heat transfer apparatus using a heat pipe system in which a refrigerant is naturally circulated by changing a gas-liquid phase in a natural circulation cycle is known. This heat transfer device has a condenser and an evaporator at a lower position than the condenser, and a refrigerant liquid pipe between which the liquid-phase refrigerant flows and a refrigerant gas pipe where the gas-phase refrigerant rises. Connected to form a natural circulation cycle. A refrigerant is sealed in the natural circulation cycle. The evaporator includes a plurality of fins, a plurality of straight pipes penetrating the fins, and a plurality of U-bends connecting the straight pipes. The evaporator is housed in an indoor unit, and a drain pan is installed below the evaporator. This indoor unit cools the room.

[0003]

However, when the above evaporator is used, since the pressure loss in the U-bend is large, the liquid refrigerant may be accumulated and the natural circulation of the refrigerant may not be performed smoothly.

[0004] Further, when dew condensation occurs in the evaporator, there is a possibility that the dew water does not flow to the drain pan and scatters around.

[0005] Therefore, an object of the present invention is to reduce the pressure loss of the refrigerant in order to solve the above problems.
It is an object of the present invention to provide a heat transfer device capable of smoothly performing a natural circulation of a refrigerant and preventing scattering of dew water generated in an evaporator.

[0006]

The invention according to claim 1 comprises a condenser and an evaporator, and the condenser and the evaporator are connected by a refrigerant liquid pipe and a refrigerant gas pipe to form a natural circulation cycle. In the heat transfer device formed as above, the evaporator has a liquid-side header into which the refrigerant liquid flows, a gas-side header from which the refrigerant gas flows out, and a plurality of fins connected to these headers and having a plurality of fins therearound. A straight pipe, and a water-repellent filter having air permeability provided downstream of the evaporator.

According to a second aspect of the present invention, in the first aspect, a drain pan is provided below the evaporator and the water-repellent filter.

According to the first aspect of the present invention, since the refrigerant flowing into the liquid header and evaporating in the straight pipe is sent to the gas header without passing through the U-bend, the resistance in the pipeline is reduced. The pressure loss of the refrigerant can be reduced, the refrigerant can be naturally circulated smoothly, and further, when dew water is generated in the evaporator, the dew water is blown off by the water repellent filter,
Since the water is dropped downward along the water repellent filter, it is possible to prevent the dew water generated in the evaporator from scattering.

According to the second aspect of the present invention, since the drain pan is provided below the evaporator and the water-repellent filter, the dew water generated in the evaporator is dropped on the drain pan. The scattering of dew water generated in the above can be prevented.

[0010]

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

In FIG. 1, reference numeral 1 denotes a heat transfer device. The heat transfer device 1 includes a refrigerator 3 for cooling water, a refrigerant / water heat exchanger 5 functioning as a condenser, and an indoor unit 7. And is configured. The indoor unit 7 contains an evaporator 9, a refrigerant regulating valve 11, and a blower 13 for blowing air into the room. The refrigerant-to-water heat exchanger 5 is installed at a high place, for example, on the roof of a building, and the indoor unit 7 is a lower part 10 of the ceiling plate 8 inside the building, which is lower than the refrigerant-to-water heat exchanger 5. Installed in A discharge port 12 is provided in the ceiling plate 8, and air is blown into the room from the discharge port 12.

The refrigerator 3 is, for example, an absorption refrigerator.
The refrigerator 3 and the refrigerant-to-water heat exchanger 5 are connected in a loop by a water pipe 15.

This refrigerant-to-water heat exchanger 5 has a refrigerant liquid pipe 17.
The refrigerant gas pipe 19 connects the indoor unit 7 to form a natural circulation cycle. A refrigerant is sealed inside the natural circulation cycle.

The refrigerant regulating valve 11 is connected to a refrigerant liquid pipe 17. Further, a booster pump 21 for forcibly circulating the refrigerant is connected to the refrigerant liquid pipe 17.

As shown in FIG. 2, the evaporator 9 includes a liquid-side header 23 for allowing a liquid refrigerant to flow in an upper part thereof.
A gas-side header 25 that allows a gas refrigerant to flow out is provided at a lower portion,
The headers 23 and 25 are connected by a plurality of straight pipes 27, and a plurality of fins 29 are attached to the straight pipes 27. The refrigerant liquid pipe 17 is connected to the liquid header 23, and the refrigerant gas pipe 19 is connected to the gas header 25.

The evaporator 9 is disposed obliquely.
A drain pan 31 is installed below the evaporator 9, and a water-repellent filter 33 is installed near the lower surface of the evaporator 9, which is arranged obliquely, and leeward on the leeward side. The water-repellent filter 33 is, for example, a stocking net member.

When the evaporator 9 is arranged so that the straight pipes 27 are laid sideways, liquid refrigerant may accumulate below the plurality of straight pipes 27 and hinder heat transfer. Thus, it is preferable to arrange the straight pipe 27 so as to be vertical.

Next, the operation of the natural circulation type heat transfer device 1 will be described.

The refrigerator 3 is operated, and cold water of, for example, 5 ° C. is supplied to the refrigerant / water heat exchanger 5. Then, in the refrigerant-to-water heat exchanger 5, the refrigerant is condensed and becomes a liquid refrigerant having a large specific gravity. Flow to 7.

The refrigerant whose refrigerant amount has been properly adjusted by the refrigerant regulating valve 11 flows into the liquid side header 23 of the evaporator 9, and flows through the straight pipe 2.
At 7, the liquid refrigerant evaporates and the room is cooled. In this process, the liquid refrigerant becomes a gas refrigerant having a very small specific gravity, and the gas refrigerant is returned from the gas side header 25 of the evaporator 9 to the refrigerant-to-water heat exchanger 5 through the refrigerant gas pipe 19 because of its light weight. That is, in this system, the refrigerant naturally circulates due to the gas-liquid phase change in the heat transfer cycle. Since the pressure loss of the refrigerant in the straight pipe 27 of the evaporator 9 is small, a liquid pool does not occur and the flow of the refrigerant is not obstructed as in the case of using the U-bend.

In such a natural circulation system, the refrigerant in the cycle is naturally circulated according to the difference in specific gravity between the liquid refrigerant and the gas refrigerant. Therefore, a circulating pump or the like is originally unnecessary. However, the booster pump 21 is used as an example in the case where it is difficult to make a head drop between the refrigerant / water heat exchanger 5 and the evaporator 9 when constructing the natural circulation system.

The indoor air passes through a ventilation port 35 provided on the ceiling plate 8 and is sucked from the upper part of the indoor unit 7. The sucked air is cooled by passing through the evaporator 9 from above to below, and is blown by the blower 13 to the discharge port 1.
Air is blown into the room from 2 to cool the room.

There is a case where dew water is generated in the evaporator 9.
This dew water is blown off to the water-repellent filter 33 installed on the leeward, without dripping directly onto the drain pan 31. The dew water blown off by the water-repellent filter 33 is dropped on the drain pan 31 installed below the evaporator 9 through the water-repellent filter 33.

According to the present embodiment, the evaporator 9 is composed of the liquid header 23 into which the refrigerant liquid flows, the gas header 25 from which the refrigerant gas flows out, and the two headers 23, 25 connected to each other. Straight pipes 27 each having a plurality of fins 29
The straight pipe 27
The gas refrigerant evaporated in the above is sent to the gas side header 25 without passing through the U-bend, so that the resistance in the pipeline is reduced, the pressure loss of the refrigerant can be reduced, and the refrigerant can be smoothly circulated smoothly.

Further, the evaporator 9 is disposed obliquely,
Since the air-permeable water-repellent filter 33 is provided near the lower surface of the evaporator 9 and on the leeward side, the dew water generated in the evaporator 9 is blown off by the water-repellent filter 33, and the water-repellent filter 3
Since the water is dripped onto the drain pan 31 provided below the evaporator 9 along the evaporator 9, it is possible to prevent the dew condensation water generated in the evaporator 9 from scattering.

Although the present invention has been described based on an embodiment, the present invention is not limited to this.

In the above embodiment, the evaporator 9 is arranged such that the gas side header 25 is located above and the liquid side header 23 is located below. However, although not shown, for example, in FIG. 9 is rotated 90 degrees to the right, and both headers 23,
When 25 is set to the left and right, the liquid refrigerant may flow from top to bottom, and the gas refrigerant may flow from bottom to top. Particularly, in this case, since the plurality of fins 29 are arranged in the vertical direction, the dew condensation water attached to the fins 29 is compared with the case where the plurality of fins 29 are arranged in the horizontal direction (the state of FIG. 2). , The water-repellent filter 33 is not required.

[0028]

According to the present invention, the pressure loss of the refrigerant can be reduced, the natural circulation of the refrigerant can be carried out smoothly, and the scattering of dew water generated in the evaporator can be prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a heat transfer device according to the present invention.

FIG. 2A is a front view of an evaporator, and FIG.
(B) is a side view of the evaporator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat transfer apparatus 5 Refrigerant-water heat exchanger (condenser) 9 Evaporator 17 Refrigerant liquid pipe 19 Refrigerant gas pipe 23 Liquid side header 25 Gas side header 27 Straight pipe 29 Fin 31 Drain pan 33 Water repellent filter

Claims (2)

[Claims] 1. A condenser, comprising: a condenser and an evaporator;
In a heat transfer apparatus in which a refrigerant liquid pipe and a refrigerant gas pipe are connected between evaporators to form a natural circulation cycle, the evaporator has a liquid-side header into which refrigerant liquid flows, and a gas-side header from which refrigerant gas flows out. A heat transfer device comprising: a header; a plurality of straight pipes connecting the headers to each other and having a plurality of fins around the header; and a permeable water-repellent filter provided downstream of the evaporator. . 2. The heat transfer device according to claim 1, wherein a drain pan is provided below the evaporator and the water repellent filter.