KR100470103B1 - Method and device for dropping condensing temperature of a cooling system - Google Patents

Abstract

The present invention discloses a method and apparatus for lowering condensation temperature in a refrigeration system. The present invention allows branched and expanded low-pressure liquid refrigerant to absorb latent heat of high-pressure gas refrigerant by branching and expanding a portion of the condensed liquid refrigerant and then evaporating by exchanging heat with a high-temperature and high-pressure gas refrigerant to be condensed. At the same time, the refrigerant passing through the condenser is distributed and condensed at the same time through a plurality of capillaries simultaneously in which the sum of each cross-sectional area is not smaller than the cross-sectional area of the condenser tube.

According to the present invention, when a high-temperature and high-pressure refrigerant gas is liquefied by heat exchange with ambient air in a condenser, a considerable amount of latent heat is deprived of the refrigerant expanded by itself without external emission, and a small amount of heat is generated by a plurality of second capillaries. Since it is dispersed and released, the heat of condensation emitted to the outside is significantly reduced, so that the condensation temperature is significantly lowered to room temperature.

Description

Method and device for dropping condensation temperature of refrigeration system {Method and device for dropping condensing temperature of a cooling system}

The present invention relates to a refrigeration system such as an air conditioner (air conditioner), and more particularly, a saturated liquid by heat exchange between the refrigerant gas heat insulation and compression at high temperature and high pressure in the condenser (condenser) to the outside air The present invention relates to a method and apparatus for lowering the condensation temperature of an air conditioner, which is capable of lowering the temperature of the condenser to room temperature by greatly reducing the heat of condensation generated during the condensation.

In general, refrigeration systems such as air conditioners are air conditioners used to properly maintain the indoor temperature by a cooling cycle using a phase change of refrigerant material through temperature and pressure changes. It is widely used.

As shown in FIG. 1, the refrigeration cycle includes a compressor (P) for adiabatic compression of refrigerant at high temperature and high pressure, and a condenser for liquefying the compressed refrigerant gas by heat dissipation by heat exchange with ambient air under a constant pressure. (C) an expansion valve (V) for reducing the pressure of the liquefied refrigerant and an evaporator (E) for evaporating the low pressure refrigerant by endothermic heat exchange with ambient air (L). Through closed circuit is to be configured. The remaining symbols Fe and Fc are evaporation fans and condensation fans for forming air flow in the evaporator (E) and the condenser (C).

Accordingly, the air conditioner cools the airflow by the latent heat of evaporation absorbed from the surrounding air as the refrigerant evaporates during the operation of the refrigeration cycle, and cools the room by discharging the cooled airflow into the room.

By the way, such a refrigeration cycle inevitably generates a considerable heat (about 55 ~ 60 ℃) in the compressor (P) and condenser (C) during operation, because of this all air conditioners are compressor (P) and condenser (C) Is placed outdoors to prevent room temperature rise (low cooling efficiency) due to self-generated heat.

In particular, the condenser (C) causes a phase change to a liquid state by releasing latent heat by heat exchange with a gas stream formed by the condensation fan (Fc), where a high-temperature and high-pressure refrigerant gas is used. It can only release a lot of heat to the surroundings during operation, causing outdoor temperature rises and even causing unreasonable rises in urban temperatures, such as hot summer heat islands.

In addition, the heat emitted from the condenser (C) is delivered directly to passers-by and people around it, not only gives a significant discomfort, but also includes a number of problems, such as the discharged heat is introduced into the neighboring house.

Furthermore, due to the discharge of the high-temperature condensation heat, the air conditioner includes an outdoor unit (Uo) installed outdoors by installing a compressor (P) and a condenser (C), and an indoor unit (Ui) installed indoors by a built-in evaporator (E). In addition, the two components can be connected to each other by a pipeline L, and even though each component is built in a cabinet, the compressor P and the condenser C are located on the outdoor side, and the evaporator E is located on the indoor side. It has a complicated problem of penetrating the window or the wall if possible.

The present invention has been made to solve the above-mentioned conventional problems, a refrigeration system that can lower the temperature of the condenser to room temperature by greatly reducing the heat of condensation emitted when the high-temperature, high-pressure refrigerant gas liquefied in the condenser Its purpose is to provide a method for lowering the condensation temperature of.

Another object of the present invention is to provide a condensation temperature drop apparatus of a refrigeration system suitable for implementing the above-described condensation temperature drop method.

1 is a circuit diagram schematically showing a general refrigeration system,

2 is a circuit diagram schematically showing a condensation temperature dropping apparatus of the refrigeration system according to the present invention;

Figure 3 is a cross-sectional view showing the first condensation temperature drop means of the condensation temperature dropping apparatus of the present invention;

Figure 4 is a side view showing a second condensation temperature drop means of the condensation temperature dropping apparatus of the present invention;

5 to 7 are circuit diagrams schematically showing other embodiments of a refrigeration system condensation temperature drop apparatus according to the present invention.

<Description of Symbols for Main Parts of Drawings>

P: Compressor E: Evaporator

10,20,30: first to third condensers 11,21: first euro

12,22: second euro 40: cooling chamber

43: strainer 50: first capillary tube

61: capillary second 70: pipeline

73: winding

In order to achieve the above objects, the method of lowering the condensation temperature of the refrigerating system according to the present invention comprises branching and expanding a part of the condensed liquid refrigerant, and then branching and expanding the liquid refrigerant by exchanging heat with a high-temperature and high-pressure gas refrigerant to be condensed. Simultaneously absorbs the latent heat of the gas refrigerant and simultaneously disperses the refrigerant passing through the condenser through a plurality of microchannels in which a sum of each cross-sectional area is not smaller than the cross-sectional area of the condenser tube. It is characterized by.

According to one preferred feature of the method of lowering the condensation temperature of the present invention, a plurality of condensers are provided so as to meet a predetermined required capacity, and are sequentially connected to each other by a conduit, and are used for heat exchange with liquid refrigerant branched at two connection parts of adjacent condensers. To reduce the condensation temperature.

According to another preferred feature of the method for lowering the condensation temperature of the present invention, the condensation process of the microfluidic flow is made in several stages and is continuously made with a time difference to gradually reduce the condensation temperature.

In addition, the condensation temperature dropping apparatus of the refrigeration system according to the present invention, the condenser for liquefying the refrigerant flowing into the heat exchange with the ambient air; Expansion means for expanding a portion of the liquid refrigerant branched therefrom to a predetermined pressure or less, a low-pressure liquid refrigerant expanded by the expansion means, and a high-pressure gas refrigerant to be condensed pass through the inside and the outside, respectively; First condensing temperature drop means having at least one cooling chamber that is heat exchanged with each other; And a second condensation temperature drop means formed in the middle of the condenser flow path, the sum of each cross-sectional area not being smaller than the cross-sectional area of the condenser tube, the second condensation temperature consisting of a plurality of tubules through which the refrigerant passes simultaneously. do.

According to one preferred feature of the condensation temperature dropping device of the present invention, a first condensation temperature drop is provided on a conduit connected to each other by a conduit, and a plurality of condensers are provided in series so as to meet a predetermined required capacity and connected to two adjacent condensers. The cooling chamber of the means is installed.

According to another preferred feature of the condensation temperature dropping apparatus of the present invention, a plurality of second condensation temperature dropping means are provided, and are provided at intervals in the flow path of the condenser to gradually reduce the temperature of the refrigerant by dispersing and condensing the refrigerant in several stages. Drop.

As described above, in the present invention, a large amount of latent heat, which has been passed through the cooling chamber when the high-temperature / high-pressure refrigerant gas is liquefied by heat exchange with the surrounding air, is lost to the branch-expanded refrigerant by itself. Passing through the tubules simultaneously dissipates a small amount of heat from each other, significantly reducing the heat of condensation emitted to the outside.

Therefore, since the refrigerant condensation temperature in the condenser is greatly lowered to room temperature, it has a great effect on the reliability of the refrigeration system such as an air conditioner, ease of installation and improvement of quality.

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

2 to 4, the condensation temperature lowering device of the air conditioner according to the present invention includes a condenser for liquefying a gas refrigerant flowing therein by heat exchange with surrounding air, and a high temperature to be condensed by branch expansion of a part of the condensed liquid refrigerant. And a first condensation temperature drop means for absorbing and removing latent heat of the gas refrigerant by heat exchange with a high-pressure gas refrigerant, and a second condensation temperature drop means for simultaneously dispersing and cooling the refrigerant being condensed through a plurality of fine flow paths.

The condenser may be composed of a single body having a predetermined capacity required, or may be configured in various forms, such as divided into two or more and connected to each other to meet the required capacity. Accordingly a suitable form can be selected.

For example, in the present embodiment, as shown in Figure 2, the three condenser 10 is sequentially connected to each other via a pipe line 70 to gradually liquefy the refrigerant gas adiabatic compression at high temperature and high pressure in the compressor (P) It consists of 20, 30.

Each condenser 10, 20, 30 is continuously banded in a zigzag form to form a tube constituting a coolant flow path, and a plurality of thin plate-like heat dissipation fins assembled and fixed at regular intervals to be perpendicular to the tube. (fin)

The first and second condensers 10, 20 are preferably partitioned so that the tubes comprise two first flow passages 11, 21 and second flow passages 12, 22 separated from one another. Corresponding flow paths 11, 21, 12, 22 are connected to conduits 71 and 72. Accordingly, the refrigerant has a U-turn flow path based on the third condenser 30.

This is to disperse the heat of condensation generated by allowing the refrigerant to condense as evenly as possible over all parts of each condenser 10, 20, 30. In particular, the high-temperature refrigerant gas introduced from the compressor (P) is configured to reduce the amount of condensation heat generated in the condenser 10, 20, 30 so as to quickly absorb the latent heat by the first condensation temperature drop means in the early stage of condensation. to be.

The first condensation temperature drop means is installed between the first and second condensers 10 and 20, and the first capillary tube 50 expands a portion of the refrigerant having substantially condensation to fall below a predetermined pressure that is easy to evaporate. And a cooling chamber 40 for mutual heat exchange between the refrigerant expanded by the first capillary tube 50 and the condensation initial refrigerant gas at a high temperature.

The cooling chamber 40 is preferably installed on the conduit 71 connecting the first flow passages 11 and 21 of the first and second condensers 10 and 20 to the branched low-pressure liquid refrigerant. Heat exchange the high pressure gas refrigerant.

To this end, the cooling chamber 40 may be configured in a double tube form so that the two refrigerants may flow in isolation from each other, but preferably, have a single internal space and pass through the low pressure liquid refrigerant branched therein. And mutually heat exchange by forming a winding portion 73 wound around a portion of the conduit 71 in a coil form on the outer circumference.

Accordingly, both ends of the cooling chamber 40 are provided with an inlet port 41 and an outlet port 42 through which the low-pressure refrigerant expanded by the first capillary tube 50 enters and exits. A strainer 43 is provided to filter foreign matter.

On the other hand, the refrigerant absorbed heat from the high-temperature refrigerant gas in the cooling chamber 40 is a vapor state, it is difficult to expect further endothermic action, the outlet 42 of the cooling chamber 40 is located on the outlet side of the evaporator (E) It is preferred to be connected.

Of course, although not shown separately, even if the condenser is made of one or two, etc., the flow path can be separated into two or more flow paths partitioned from each other and sequentially connected, in this case the cooling chamber 40 is adjacent to the condensation initial It can be installed at the connection of two flow paths.

The first capillary tube 50 may branch to a portion of the condensed liquid refrigerant and expand to a required pressure, so that the gas refrigerant may be connected to any position in the section condensed into the liquid phase.

Accordingly, it may be connected to the outlet of the condenser, that is, the outlet of the second passage 12 of the first condenser 10, and the second passage 12 of the first and second condenser 10, 20, as shown. One end may be connected to a conduit 72 connecting the 22, the other end of which is connected to an inlet 41 of the cooling chamber 40.

The second condensation temperature drop means 60 may be installed at any position of the condensation section. For example, the second condensation temperature drop means 60 is installed in the middle of the flow path of the third condenser 30 so as to disperse the refrigerant and transport it at the same time. To this end, the tube 31 of the third condenser 30 is closed by cutting a part of the middle thereof, and instead, the second condensation temperature drop means 60 interconnects the cut tube 31 to the refrigerant. Function as a flow path

The second condensation temperature drop means 60 is a plurality of second capillary tube (2), both ends of which are simultaneously connected to both cut ends of the tube (31) of the third condenser (30), as shown for the distributed transport of the refrigerant ( 61). At this time, the refrigerant passing through the second capillary tube 61 should not cause a pressure drop, so the sum of the cross-sectional areas of each second capillary tube 61 is equal to or slightly larger than the cross-sectional area of the tube 31.

Next, the operation of the refrigeration system condensation temperature drop apparatus according to the present invention configured as described above will be described.

The refrigerant gas compressed at a high temperature and high pressure in the compressor P may include the first passage 11 of the first condenser 10, the cooling chamber 40, and the first passage 21 and the third of the second condenser 20. The condenser 30, the second capillary tube 61, the second channel 22 of the second condenser 20, and the second channel 12 of the first condenser 10 are sequentially passed through the condenser fan Fc. It is condensed into the liquid phase by heat exchange with airflow.

The refrigerant gas introduced into the first passage 11 of the first condenser 10 has a lot of latent heat to generate a high temperature condensation heat, the first condenser 10 has a flow path of the first and second passages 11 Since it is divided into (12) it is to pass through the first condenser 10 quickly and the amount of condensation heat discharge from the first condenser 10 is reduced by that much.

As such, the refrigerant gas passing through the first passage 11 of the first condenser 10 still has a large amount of latent heat as a condensation initial state, but is significantly latent by the first condensation temperature drop means as it passes through the cooling chamber 40. Will be taken away.

That is, a part of the liquid refrigerant in the final condensation terminal that has passed through the second flow passage 22 of the second condenser 20 branches to the first capillary tube 50 and is expanded under a predetermined pressure inside the cooling chamber 40. Of refrigerant flows, the hot refrigerant gas from the first passage 11 of the first condenser 10 passes through the winding portion 73 of the conduit 71 wound around the outer periphery of the cooling chamber 40. Heat exchange with the low pressure liquid refrigerant in the cooling chamber (40).

Accordingly, the low pressure liquid refrigerant in the cooling chamber 40 absorbs the latent heat from the high temperature refrigerant gas passing through the winding portion 73 of the conduit 71 and evaporates the latent heat.

However, at this time, the heat of condensation emitted from the refrigerant gas is hardly emitted to the outside because most of the evaporative refrigerant in the cooling chamber 40 is absorbed, and thus the amount of heat of condensation is greatly reduced.

On the other hand, impurities contained in the refrigerant during the heat exchange in the cooling chamber 40 are also simultaneously removed by the strainer 43 housed therein. When the low pressure liquid refrigerant is evaporated by heat exchange with the high temperature refrigerant gas, the poor liquid vapor refrigerant is also separated by the strainer 43.

Next, the refrigerant leaving the cooling chamber 40 is further condensed while passing through the first flow passage 22 of the second condenser 20, but a considerable amount of latent heat is already removed while passing through the cooling chamber 40. Therefore, the amount of heat of condensation is significantly reduced.

Subsequently, the refrigerant flows into the third condenser 30 and the condensation process proceeds further. In this process, the refrigerant passes simultaneously through a plurality of second capillary tubes 61, which are the second condensation temperature drop means 60. Even lower.

In other words, the refrigerant is dispersed in a plurality of second capillaries 61 having a predetermined length and simultaneously moved to maintain a temperature close to room temperature by the uniform dispersion of the heat of condensation generated with active heat exchange due to the increase in surface area. Of course, at this time, since the sum of the cross-sectional areas of each second capillary tube 61 is equal to or slightly larger than the cross-sectional area of the tube 31 of the third condenser 30, no pressure drop occurs.

As such, the refrigerant passing through the third condenser 30 sequentially passes through the second flow passage 22 of the second condenser 20 and the second flow passage 12 of the first condenser 10 while the temperature is considerably lowered. After the condensation is completed, it is transferred to the inlet of the evaporator (E).

Accordingly, in the first and second condensers 10 and 20, refrigerants having a temperature difference from each other pass through the first and second flow passages 11 and 12 (21 and 22) as they cross each other, so that a relatively high temperature is achieved. Heat of condensation of the side refrigerant is conducted to the low temperature side refrigerant. Accordingly, not only have almost the same temperature distribution in all parts of each condenser 10, 20, 30, but also the generation amount of heat of condensation is greatly reduced, so that the temperature is significantly lower than that of the prior art and is maintained at room temperature.

According to the experiments of the present inventors, when the air conditioner was operated at an indoor temperature of about 27 to 28 캜, the condensation temperature was found to be about 34 to 34.8 캜. In particular, it is difficult to feel a special heat as the temperature close to the outdoor outdoor temperature in summer, especially, the condensation temperature is significantly lowered by more than 20 ℃ compared to the conventional condensation temperature of about 56 ℃ at room temperature 28 ℃ can significantly reduce the heat of condensation.

On the other hand, Figure 5 shows another embodiment of the present invention, which consists of two second condensation temperature drop means 60 in the configuration of the above-described configuration arranged at intervals from each other.

In this embodiment, the condensation temperature drop of the refrigerant proceeds stepwise with a time difference, thereby further lowering the condensation temperature. In particular, when the condensation temperature is gradually lowered by configuring two or more second condensation temperature lowering means, the condensation temperature can be lowered below room temperature.

6 and 7 further embodiments of the present invention are shown. FIG. 6 is a configuration in which the first condensation temperature drop means is disposed behind the second condensation temperature drop means 60 in the configuration of the above-described embodiment, and FIG. 7 is the first condensation temperature drop means 60 in the first condensation temperature. It is the structure arrange | positioned respectively in the electric potential and back of a descending means.

Embodiments of this configuration also have the same effect as the above-described embodiments, and although not shown, the condensation temperature is gradually increased by configuring two or more second condensation temperature lowering means 60 as in the second embodiment. Of course, it can fall below normal temperature by falling.

While the present invention has been described with reference to several configurations as examples, this is merely for the purpose of illustration, the present invention is not limited to this, it is obvious that can be modified in various forms.

For example, although not separately shown, the first and second condensation temperature drop means, which is a characteristic element of the present invention, may be installed in one or two or more condensers without partitioning the flow path. Even in the case of two pieces, a plurality of second condensation temperature drop means may be provided, and a plurality of cooling chambers may be provided.

As described above, according to the method and apparatus for lowering the condensation temperature of an air conditioner according to the present invention, when a high-temperature / high-pressure refrigerant gas is liquefied by heat exchange with surrounding air in the condenser, a considerable amount of latent heat that has been passed through the cooling chamber is itself. The heat of condensation is greatly reduced since it is not taken out by the branch-expanded refrigerant at and released to the outside.

In addition, the refrigerant having a significantly lower temperature passes through a plurality of long capillaries at the same time, dissipating a small amount of heat from each other, and actively exchanging heat by increasing the surface area, thereby significantly lowering the condensation temperature.

Accordingly, the outdoor unit can be installed freely regardless of the place, and in some cases, the outdoor unit can be installed indoors or the air conditioner can be integrally formed.

Therefore, the present invention has a very excellent effect that greatly contributes to the reliability of the air conditioner, the ease of installation and the improvement of the quality.

Claims (22)

A refrigeration system in which a refrigerant gas compressed at high temperature and high pressure is liquefied by heat exchange with ambient air, the liquefied refrigerant is expanded, and then evaporated by heat exchange with ambient air to perform cooling by latent heat of evaporation of the refrigerant. By branching and expanding a portion of the condensed liquid refrigerant, and heat-exchanging with the high-temperature and high-pressure gas refrigerant to be condensed, the branch-expanded liquid refrigerant absorbs the latent heat of the gas refrigerant, 10. A method of lowering the condensation temperature of a refrigeration system, wherein the refrigerant passing through the condenser is distributed and condensed at the same time through a plurality of microchannels whose sum of each cross-sectional area is not smaller than the condenser tube cross-sectional area. 2. The condensing temperature of the refrigerating system according to claim 1, wherein the condenser is composed of a single body having a predetermined required capacity, branched expansion of the liquid refrigerant at the outlet side of the condenser, and heat exchanged with gas refrigerant at the inlet side of the condenser. Descent method. The method of claim 2, wherein the flow path of the condenser is divided into a plurality of flow paths which are partitioned from each other and sequentially connected to each other, and the temperature drop is performed by heat exchange with the liquid refrigerant branched at two adjacent flow paths. How to lower condensation temperature in refrigeration system. The method of claim 1, wherein the condenser is provided in plural to meet a predetermined required capacity, and is sequentially connected to each other by a conduit, and a condensation temperature drop process is performed by heat exchange with liquid refrigerant branched at two adjacent condensers. Method for lowering the condensation temperature of the refrigeration system, characterized in that. 5. The method of claim 4, wherein the flow paths of the condensers are divided into first and second flow paths partitioned from each other, and the corresponding flow paths are connected to each other by conduits to sequentially pass the refrigerant through the first flow paths of the condensers, and then U turn To pass the second flow path of each condenser in reverse order. The refrigeration system according to any one of claims 1 to 6, wherein the microfluidic dispersion condensation process is carried out in several stages and successively at a time difference to gradually reduce the condensation temperature. How to lower condensation temperature 7. The method of claim 6, wherein the step of dropping the condensation temperature by heat exchange with the branched liquid refrigerant is performed before the step of dropping the temperature by dispersion of condensed microfluidic channels. 7. The method of claim 6, wherein the step of lowering the condensation temperature by heat exchange with the branched refrigerant is performed later than the step of lowering the temperature by dispersion of condensed microfluidic channels. The method of claim 6, wherein the microchannel dispersion and condensation process is performed before and after the condensation temperature drop process by heat exchange with the branched liquid refrigerant. The method of claim 1, wherein the low-pressure vapor refrigerant evaporated by heat exchange with the refrigerant gas after branch expansion at the outlet of the condenser is bypassed toward the outlet of the evaporator. A refrigeration system in which a refrigerant gas compressed at high temperature and high pressure is liquefied by heat exchange with ambient air, the liquefied refrigerant is expanded, and then evaporated by heat exchange with ambient air to perform cooling by latent heat of evaporation of the refrigerant. A condenser to liquefy the refrigerant flowing therein by heat exchange with ambient air; Expansion means for expanding a portion of the liquid refrigerant branched therefrom and below a predetermined pressure, the low pressure liquid refrigerant expanded by the expansion means, and the high pressure refrigerant gas to be condensed are separated into the inside and the outside; First condensing temperature drop means having at least one cooling chamber that is heat-exchanged with each other; And a second condensing temperature drop means formed in the middle of the condenser flow path, the sum of each cross-sectional area not being smaller than the cross-sectional area of the condenser tube, the second condensing temperature consisting of a plurality of tubules through which the refrigerant passes simultaneously. System condensation temperature drop. 12. The condensation temperature dropping apparatus of claim 11, wherein the condenser is composed of a single body having a predetermined required capacity. The method of claim 12, wherein the flow path of the condenser is divided into a plurality of flow paths are partitioned from each other sequentially connected, the cooling chamber of the first condensation temperature drop means is installed on the conduit connecting two adjacent flow paths Condensation temperature dropping device for refrigeration system. The cooling chamber of the first condensation temperature drop means is installed on a conduit connecting a plurality of condensers to each other and sequentially connected to each other by a conduit. Condensation temperature dropping device of the refrigeration system, characterized in that. 15. The method of claim 14, wherein the flow path of the condenser is divided into the first and second flow paths are partitioned from each other and the corresponding flow paths are connected to the pipeline so that the refrigerant passes through the first flow path of each condenser in turn U turn The condensation temperature dropping apparatus of the refrigeration system, characterized in that passing through the second flow path of each condenser in reverse order. 15. The method according to any one of claims 11, 12 or 14, wherein the second condensation temperature lowering means is provided in plural and is provided at intervals in the flow path of the condenser to disperse and condense the refrigerant in various stages. A condensation temperature dropping device for a refrigeration system. 17. The apparatus of claim 16, wherein the cooling chamber of the first condensation temperature drop means is disposed at a potential higher than that of the second condensation temperature drop means. 17. The apparatus of claim 16, wherein the cooling chamber of the first condensation temperature drop means is disposed behind the second condensation temperature drop means. 17. The apparatus of claim 16, wherein the cooling chamber of the first condensation temperature drop means is disposed at the potential and the rear of the second condensation temperature drop means, respectively. 12. The method of claim 11, wherein the expansion means of the first condensation temperature drop means is connected to the inside of the cooling chamber, and a portion of the conduit through which the refrigerant gas to be condensed is wound in the form of a coil in the outer circumference of the cooling chamber. Condensation temperature dropping device for refrigeration system. The apparatus of claim 20, wherein the outlet of the cooling chamber is connected to the outlet of the evaporator. 21. The condensation temperature reduction apparatus of claim 11 or 20, wherein a strainer is provided in a cooling chamber of said first condensation temperature reduction means.