JP2009002539A - Exhaust-heat driving type absorption refrigerating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a heat load of a generator by utilizing discharged hot water remaining at a generator side to improve the heat efficiency of the generator, and further to effectively miniaturize the generator. <P>SOLUTION: In this exhaust-heat driving type absorption refrigerating device having a solution separating cooling method, and comprising a supercooling means for removing absorption heat generated in an absorber A, and the generator G generating refrigerant vapor and an absorption dense solution by heating the absorption dilute solution supplied from the absorber A by prescribed discharged hot water, a second heat exchanger 4 for reducing the heat load by heating the absorption dilute solution from the absorber A in advance by residual discharged hot water in the discharged hot water is disposed at the absorption dilute solution inlet side of the generator G independently from a first heat exchanger at a generator side generating the refrigerant vapor and the absorption dense solution by heating the absorption dilute solution supplied from the absorber A by the prescribed discharged hot water, and thus the heat load of the generator G is further reduced, the heat efficiency of the generator G is enhanced, and the generator G can be miniaturized. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure of an exhaust heat drive type absorption refrigeration apparatus employing an indirect air cooling system.

  As shown in FIG. 4, for example, an absorber of a conventional general air-cooled absorption refrigeration apparatus includes an absorber 30 and a plurality of heat transfer tubes 3a, 3a each having a large number of heat transfer fins 9, 9,. ... (solution inlets 3c, 3c ...) and the absorption solution distribution tray 11, and the heat transfer tubes 3a, 3a, ... of the absorber 30 via the solution circulation pump P provided in the solution circulation path 12. ..Absorptive solution flows through the inner tube wall, and refrigerant vapor from the evaporator side flows through the refrigerant vapor passages 3b, 3b... In the heat transfer tubes 3a, 3a. However, the absorption solution is a direct air cooling method in which the absorption solution is cooled by the air cooling fins 9, 9... Cooled by the cooling air of the fan F around the heat transfer tubes 3a, 3a. Since it is important to expand the gas-liquid interface to simultaneously cool the Constraints is large.

  For example, the space in the upper and lower absorber headers including the absorbing solution distribution tray 11, the use of a large-diameter heat transfer tube for considering vapor pressure loss, and the connection tube with the evaporator become thick due to the limitation on the flow rate of the refrigerant vapor Etc.

  Moreover, since there exists the connection location by welding also in terms of cost, it becomes expensive in a small machine.

  On the other hand, for example, as shown in FIG. 5, the absorption solution flowing into the cylindrical absorber 30 through the solution circulation path 13 by the solution pump P is transferred to the heat transfer tubes 15 a, 15 a. , 17..., And by supercooling by the air-cooled cooler 15 including the upper and lower headers 16b and 16a, the fan F, etc., only the refrigerant vapor is absorbed in the absorber 30, and the absorbed heat is supercooled. There is a solution separation cooling (indirect air cooling) system that only removes the absorbed solution by sensible heat, and in this system, the absorber 30 part is miniaturized so that no cooling means is required, so in a small air cooling absorber It is advantageous.

  Therefore, utilizing such characteristics, in the same configuration, as a method of further absorbing the refrigerant vapor with respect to the absorbing liquid, a method of absorbing the refrigerant vapor by the absorbing solution spray method as shown by reference numeral 14 in FIG. 5 is adopted. There is also an absorber of an air-cooled absorption refrigeration apparatus (see, for example, Patent Document 1).

JP-A-7-98163 (Specifications page 1-8, FIG. 1-12)

  However, this spray method has problems such as clogging of the absorbing liquid spray nozzle 14 and an increase in power consumption due to an increase in the discharge head of the solution pump.

Therefore, in order to solve such a problem, the inventor of the present application, for example, as shown in FIG. 6, uses a cooling method for the absorber A, and an air-cooling system including a fan F ₂ for the absorbing solution flowing into the absorber A. While the indirect air cooling system in which only the sensible heat of the solution supercooled by the cooler Hc is removed, a liquid film flow-down plate structure is adopted for the absorber 8 of the absorber A, and the absorbing solution is placed on the plate above the absorber. By absorbing the refrigerant vapor (not shown) by providing an absorption solution distribution tray for evenly distributing the liquid, and flowing the supercooled absorption solution in a liquid film state on both surfaces of the plate (not shown). An absorption refrigeration apparatus capable of reducing the cost efficiently and in size has already been proposed (for example, see the specification and drawings of Japanese Patent Application No. 2006-84428 as an example).

  The refrigeration cycle of the absorption refrigeration apparatus of FIG. 6 enhances the refrigerant absorption capacity of an aqueous solution (hereinafter simply referred to as a dilute solution) of an absorbent (for example, LiBr) that has an excellent ability to absorb a refrigerant (for example, water). The generator G for heating and concentrating the solution with a heating medium (for example, exhausted hot water) and the vapor (refrigerant) separated from the solution in the generator G are introduced and cooled to be liquefied. The condenser C, the evaporator E that introduces the refrigerant liquefied by the condenser C and evaporates (vaporizes) at a low pressure, absorbs the vapor (refrigerant) generated in the evaporator E, and maintains the low pressure. In order to concentrate the absorber (dilute solution) diluted by absorbing the vapor (refrigerant) in the absorber A for introducing the concentrated solution concentrated in the generator G for the purpose, Solution pump P for feeding to G It is constituted by a part (most part) air cooler for supercooling this by introducing (air-cooled heat exchanger) Hc dilute solution discharged from the solution pump P.

The symbol He represents a solution heat exchanger that exchanges heat between a part of the diluted solution that has exited from the absorber A (the diluted solution supplied to the generator G) and the concentrated solution that has exited from the generator G, and F ₁ represents condensation. It is a cooling fan that air-cools the vessel C.

  In an absorption refrigeration system employing such a solution separation cooling system, the solution is supercooled by air cooling or other solution coolers, and the absorption heat is removed by sensible heat of the solution, so the amount of solution supplied to the generator is reduced. Even if it is increased, the performance is hardly degraded as compared with the conventional air-cooled absorber.

  However, the exhaust heat driven air-cooled absorption type driven by hot water exhaust heat such as a small generator or GHP is generally used in a single-effect refrigeration cycle from the viewpoint of cost. A major issue is how to reduce the cost of the generator to be generated.

  In particular, the use of waste heat water is difficult to establish in relation to the amount of recovered heat unless it is a cheaper device, and a significant reduction in the cost of the generator is required for the exhaust heat driven absorption refrigeration system. .

  The present invention has been made in response to such problems, and separately from the heat exchanger of the generator, a second solution is used to heat the supply solution to the generator with surplus warm water on the generator side. An exhaust heat drive type absorption refrigeration apparatus that reduces the heat load of the generator, improves the thermal efficiency of the generator, and further reduces the size of the generator by providing a heat exchanger It is intended to provide.

  In order to achieve the same object, the present invention is configured with the following problem solving means.

(1) First problem-solving means The first problem-solving means of the present invention is a supercooling in which absorption heat generated in an absorber is removed by sensible heat of the solution by supercooling the absorbing solution flowing into the absorber. Exhaust heat drive that employs a solution separation and cooling system that includes a generator that generates refrigerant vapor and an absorbed concentrated solution by heating the diluted diluted solution supplied from the absorber with a predetermined discharged warm water. This is a type absorption refrigeration apparatus, separately from the first heat exchanger on the generator side that generates refrigerant vapor and an absorption concentrated solution by heating the diluted absorption solution supplied from the absorber with a predetermined exhaust hot water. A second heat exchanger for reducing the heat load by preliminarily heating the diluted diluted solution from the absorber with the excess discharged warm water in the discharged warm water is provided on the inlet side of the diluted diluted solution inlet of the generator Configured.

  In this way, the absorption dilute solution supplied from the absorber is heated by a predetermined exhaust hot water, and is generated from the absorber separately from the generator-side first heat exchanger that generates refrigerant vapor and an absorption concentrated solution. When the second heat exchanger for preheating the diluted diluted solution to the generator using the excess discharged warm water in the generator side discharged warm water is provided on the absorbed diluted solution inlet side of the generator, The heat load of the generator-side first heat exchanger is reduced, the thermal efficiency of the generator-side first heat exchanger is further increased, and the generator itself can be further downsized.

(2) Second Problem Solving Means A second problem solving means of the present invention is a second problem reducing means for reducing the heat load of the generator-side first heat exchanger in the configuration of the first problem solving means. The supply of the warm water to the heat exchanger is configured to be supplied in parallel independently of the generator-side first heat exchanger.

  The supply of waste hot water to the second heat exchanger is performed in parallel with a parallel supply system that supplies the first heat exchanger in parallel independently of the first heat exchanger on the generator side, and the first heat exchanger and the second heat exchanger. Are connected in series and supplied to the second heat exchanger via the first heat exchanger and to the generator-side first heat exchanger via the second heat exchanger, respectively. There are two supply styles, such as the series supply method, but the parallel supply method in which the generator side first heat exchanger is supplied in parallel independently of each other like this means Since a large temperature difference from the absorbing dilute solution at the exchange part can be taken, it is advantageous in terms of efficiency.

  As a result, each heat exchange section can be made smaller by that amount.

(3) Third Problem Solving Means According to a third problem solving means of the present invention, in the configuration of the first problem solving means, the second problem is to reduce the heat load of the generator-side first heat exchanger. The supply of waste hot water to the heat exchanger is configured to be supplied in series to the second heat exchanger via the generator-side first heat exchanger.

  The supply of waste water to the second heat exchanger for reducing the heat load of the generator is performed in parallel with a parallel supply system that supplies the parallel heat independently from the generator-side first heat exchanger; There are two supply styles: a serial supply system that supplies the second heat exchanger in series via the first heat exchanger and vice versa. In the case of the serial supply system that supplies the second heat exchanger in series via the first heat exchanger, the temperature of the exhaust water in the second heat exchanger is lowered correspondingly, but the temperature of the other exhaust water Even when the absolute amount of is small, it is possible to cope with it effectively.

(4) Fourth Problem Solving Means According to a fourth problem solving means of the present invention, in the configuration of the first problem solving means, the supply of waste water to the generator-side first heat exchanger is the same as the generator. It is comprised so that it may supply in series via the 2nd heat exchanger for reducing the heat load of the side 1st heat exchanger.

  The supply of waste hot water to the first heat exchanger on the generator side and the second heat exchanger for reducing the heat load on the generator is the same as that on the generator side as in the third problem solving means. In addition to the case where the heat exchanger is supplied in series to the second heat exchanger for reducing the heat load having a relatively small heat exchange capacity, conversely, via the second heat exchanger for reducing the heat load. A serial supply system that supplies the generator-side first heat exchanger in series is also conceivable.

  In such a case, the temperature of the discharged hot water in the first heat exchanger is slightly lowered, but it can be effectively dealt with when the absolute amount of the discharged hot water is small.

(5) Fifth Problem Solving Means A fifth problem solving means of the present invention is the absorption concentrated solution and the absorber from the generator in the configuration of the first, second, third or fourth problem solving means. A solution heat exchanger for exchanging heat with the absorption dilute solution from the heat exchanger, and the two heat exchangers of the solution heat exchanger and the second heat exchanger are respectively concentrated solution and dilute solution, waste hot water and dilute solution Are integrated as a three-fluid heat exchanger through a partition plate so as to flow in a counterflow state.

  In this way, the overall structure is further simplified, and further miniaturization and cost reduction can be achieved.

  As a result of the above, according to the present invention, in the exhaust heat driven absorption refrigeration apparatus adopting the solution separation cooling method, the generator can be more effectively downsized, the efficiency of heat exchange with the dilute solution can be improved, and the excess exhaust hot water heat Can be used effectively.

(Best Embodiment 1)
FIG. 1 shows the configuration of an exhaust heat drive type absorption refrigeration apparatus adopting the solution separation cooling system according to the best embodiment 1 of the present invention.

  The refrigeration cycle of this absorption refrigeration apparatus is designed to increase the refrigerant absorption capacity of an aqueous solution (hereinafter simply referred to as a dilute solution) of an absorbent (for example, LiBr) having an excellent ability to absorb a refrigerant (for example, water). A generator G for heating and concentrating with a heating medium (for example, waste water), a condenser C for introducing the vapor (refrigerant) separated from the solution in the generator G and cooling it to liquefy, An evaporator E that introduces the refrigerant liquefied by the condenser C and evaporates (vaporizes) at low pressure, and is concentrated by the generator G to absorb the vapor (refrigerant) generated in the evaporator E. An absorber A for introducing a concentrated solution, and a solution pump P for re-feeding the solution (dilute solution) diluted by absorbing vapor (refrigerant) in the absorber A to the generator G to concentrate it; Discharge from the solution pump P Some of the rare solutions is constituted by a (mostly) by introducing the air cooler for supercooling it (air-cooled heat exchanger) Hc.

The symbol He denotes a solution heat exchanger that exchanges heat between a part of the dilute solution that has exited from the absorber A (the dilute solution supplied to the generator G) and the concentrated solution that exits from the generator G, and F ₁ represents condensation. F ₂ is a cooling fan that air-cools the air-cooling cooler Hc.

In the case of this embodiment, as described above, the LiBr absorption solution entering the absorber A is supercooled by the air-cooled cooler Hc provided with the cooling fan F ₂ , and the inside of the absorber A arranged in parallel with the evaporator E Then, the solution separation cooling (indirect air cooling) method is adopted in which the absorption heat generated during absorption is indirectly cooled by the sensible heat of the supercooled absorption solution simply by absorbing the refrigerant vapor evaporated in the evaporator E. Has been.

  Although a detailed structure is not shown, for example, a refrigerant distribution tray and an absorption solution distribution tray for evenly distributing the refrigerant and the absorption solution are provided on the upper portions of the evaporator E and the absorber A, respectively. The heat exchanger 7 is, for example, a plate-type heat exchanger in which a cooled body passage through which cold water or the like flows is formed. The refrigerant is allowed to flow through a liquid film on the surface and evaporated to evaporate the internal fluid to be cooled (cold water or the like). On the other hand, the heat exchange section 8 of the absorber A is, for example, a refrigerant vapor by allowing the solution to flow vertically down in a liquid film state on both surfaces of a heat transfer plate that is bent and arranged in a corrugated structure. It is designed to promote the absorption of water more effectively.

  In this case, as the absorber A, a structure capable of being integrally brazed in combination with the evaporator E by adopting a liquid film flow-down type absorber structure with a plate that can be easily integrated with the evaporator E. If the containers for storing them are also integrated, a more compact and inexpensive air-cooled absorber can be provided.

  In the absorption refrigeration apparatus adopting such a solution separation cooling system, the solution is supplied to the generator G because the solution is supercooled by the air cooling cooler Hc and the absorption heat is removed by sensible heat of the solution. Even if it increases, compared with the conventional air-cooled absorber, a performance fall hardly arises.

  However, the exhaust heat driven air cooling absorption type driven by hot water exhaust heat such as a small generator or GHP is generally used in a single-effect refrigeration cycle from the viewpoint of cost. How to reduce the cost of the generator G to be generated is a big problem.

  In particular, the use of waste hot water is difficult to establish unless it is a cheaper device, and the cost of the generator G is greatly reduced.

  Therefore, in this embodiment, separately from the first waste warm water heat exchanger 1 in the generator G, the supply dilute solution to the generator G is heated with surplus waste warm water on the generator G side. By providing the second exhaust hot water heat exchanger 4 that reduces the thermal load, the generator G side first exhaust hot water heat exchanger 1 can be sufficiently reduced to reduce the thermal load of the generator G In addition, the generator G itself can be reduced in size.

  The second waste water heat exchanger 4 is used to heat the diluted solution inlet side of the generator G, for example, the absorbing diluted solution entering the generator G between the solution heat exchanger He and the generator G. It is installed in a part that is most efficient and does not hinder device compaction.

  In this way, separately from the generator G side first waste water heat exchanger 1 that generates the refrigerant vapor and the absorption concentrated solution by heating the absorption diluted solution supplied from the absorber A with a predetermined waste water, The diluted absorption solution from the absorber A to the generator G is preliminarily heated using the excess waste water in the waste water supplied to the first waste water heat exchanger 1 on the generator G side. If the second waste heat water heat exchanger 4 is provided on the absorption dilute solution inlet side of the generator G, the heat load of the generator G is further reduced, and the generator G side first waste water heat exchanger 1 The thermal efficiency is further increased, and the generator G itself can be further reduced in size.

  Moreover, in the case of the present embodiment, the supply of the exhaust warm water to the second exhaust warm water heat exchanger 4 is performed in parallel (separately) independently of the generator G side first exhaust warm water heat exchanger 1. It is configured to supply.

  In this way, when the parallel supply system is used in which the generator G side first exhaust hot water heat exchanger 1 is supplied in parallel independently of each other, the temperature difference from the absorbing dilute solution in each heat exchange section is sufficiently large. Can do.

  As a result, each heat exchange section can be made smaller by that amount.

(Best Mode 2)
Next, FIG. 2 shows a configuration of an exhaust heat drive type absorption refrigeration apparatus adopting a solution separation cooling system according to the second preferred embodiment of the present invention.

Also in this embodiment, the LiBr absorbing solution entering the absorber A is supercooled by the air-cooled cooler Hc provided with the cooling fan F ₂ as in the best embodiment 1, and the evaporator E Solution absorption in which absorption heat generated at the time of absorption is indirectly cooled by sensible heat of the supercooled absorption solution only by absorbing the refrigerant vapor evaporated in the evaporator E in the absorber A arranged in parallel. A cooling (indirect air cooling) method is adopted.

  And the generator G provided with the 1st waste water heat exchanger 1 which produces | generates a refrigerant | coolant vapor | steam and an absorption concentrated solution similarly by heating the absorption diluted solution supplied from the said absorber A with predetermined | prescribed waste water. The second exhaust warm water heat exchanger 4 for heating the diluted diluted solution from the absorber A in advance with the excess discharged warm water in the discharged warm water is provided on the absorbent diluted solution inlet side of the generator G. Has been.

  In this way, separately from the generator G side first waste water heat exchanger 1 that generates the refrigerant vapor and the absorption concentrated solution by heating the absorption diluted solution supplied from the absorber A with a predetermined waste water, A second waste water heat exchanger 4 for heating the diluted diluted solution from the absorber A to the generator G in advance using the excess waste water in the generator G side waste water is provided as the generator G. Is provided at the inlet side of the absorbing dilute solution, further reducing the heat load of the first waste water heat exchanger 1 on the generator G side, further increasing the thermal efficiency of the generator G, and further reducing the size of the generator G itself. Can be realized.

  However, in the same configuration, the waste water for the second waste water heat exchanger 4 is transferred to the generator G side second waste water heat exchanger 4 via the generator G side first waste water heat exchanger 1. It is configured to be supplied in series.

  The supply of the waste water to the second waste water heat exchanger 4 may be a parallel supply system in which the waste water is supplied in parallel independently of the generator G side first waste water heat exchanger 1 as described above. A serial supply system that supplies the second exhaust hot water heat exchanger 4 in series via the generator G side first exhaust hot water heat exchanger 1 as in the present embodiment is also conceivable.

  As described above, in the case of the serial supply system in which the waste water is supplied in series to the second waste water heat exchanger 4 via the first waste water heat exchanger 1 on the generator G side, Although the temperature of the discharged hot water on the hot water heat exchanger 4 side is slightly lower, it is advantageous in that it can effectively cope with the case where the absolute amount of the discharged hot water is small.

(Modification)
In addition, when adopting such a series supply system, in addition to the above method, for example, the generator G side first waste water heat exchanger via the generator G side second waste water heat exchanger 4 is used. A serial supply system that supplies the 1 side in series is also conceivable.

  As described above, in the case of the serial supply system in which the waste water is supplied in series to the first waste water heat exchanger 1 on the generator G side via the second waste water heat exchanger 4, the second waste water is used. The waste water temperature at the hot water heat exchanger 4 side becomes high, and it is possible to effectively cope with the case where the absolute amount of the waste water is small.

(Best Mode 3)
Further, FIG. 3 shows a configuration of an exhaust heat drive type absorption refrigeration apparatus adopting a solution separation cooling system according to the third preferred embodiment of the present invention.

Also in this embodiment, the LiBr absorption solution entering the absorber A is supercooled by the air-cooled cooler Hc equipped with the cooling fan F ₂ and evaporated as in the first and _second embodiments. By absorbing the refrigerant vapor evaporated by the evaporator E in the absorber A arranged in parallel with the container E, the absorption heat generated at the time of absorption is indirectly cooled by the sensible heat of the supercooled absorption solution. 1st waste heat water heat exchange which employs a solution separation cooling (indirect air cooling) system to generate refrigerant vapor and an absorption concentrated solution by heating the absorption diluted solution supplied from the absorber A with a predetermined waste warm water Along with the generator 1, a second waste water heat exchanger 4 for preliminarily heating the diluted diluted solution from the absorber A to the generator G with surplus waste water in the waste water is used for the generator G. It is provided on the absorption dilute solution inlet side.

  Therefore, as in the case of the above-described best embodiments 1 and 2, the heat load of the first waste water heat exchanger 1 on the generator G side is reduced, the thermal efficiency of the generator G is further increased, and further generated The container G itself can be made as small as possible.

  In this embodiment, in that case, the two heat exchangers of the second waste heat water heat exchanger 4 and the solution heat exchanger He are further divided into a concentrated solution and a dilute solution, and a waste hot water and a dilute solution, respectively. As shown in the figure, the dilute solution flow paths 51a, 51, 50a, 52, 52a, the solution heat exchanger 2, and the second waste water heat exchanger 4 are respectively placed in the containers 5 so that they flow in a counterflow state. A three-fluid heat exchanger is configured by integrating the partition plate 50 as shown in the figure.

  In this way, the overall structure is further simplified, and further miniaturization and cost reduction can be achieved.

1 is a refrigeration circuit diagram showing a configuration of an exhaust heat drive type absorption refrigeration apparatus according to Embodiment 1 of the present invention. It is a freezing circuit diagram which shows the structure of the exhaust-heat drive type absorption refrigerating device which concerns on best Embodiment 2 of this invention. It is sectional drawing which shows the structure of the principal part of the exhaust-heat drive type absorption refrigeration apparatus which concerns on best Embodiment 3 of this invention. It is a figure which shows the structure of the absorber of the conventional direct air cooling system. It is a figure which shows the structure of the absorber part of the conventional absorption cooling system of an indirect air cooling system. It is a refrigeration circuit diagram showing a configuration of a conventional indirect air cooling type exhaust heat drive type absorption refrigeration apparatus.

Explanation of symbols

  1 is a 1st waste heat water heat exchanger, 2 is a heat exchanger part of the solution heat exchanger He, 4 is a 2nd waste heat water heat exchanger, 50 is a partition plate, A is an absorber, E is an evaporator, Hc is an air-cooled cooler, and He is a solution heat exchanger.

Claims (5)

  Supercooling means for removing the absorption heat generated in the absorber with the sensible heat of the solution by supercooling the absorption solution flowing into the absorber and supplying the diluted diluted solution supplied from the absorber to a predetermined waste warm water An exhaust heat drive type absorption refrigeration apparatus adopting a solution separation cooling system comprising a generator that generates refrigerant vapor and an absorption concentrated solution by heating with an absorption dilute solution supplied from the absorber. Separately from the generator-side first heat exchanger that generates refrigerant vapor and an absorption concentrated solution by heating with predetermined waste water, the absorbent dilute solution from the absorber is removed by excess waste water in the waste water. An exhaust heat drive type absorption refrigeration apparatus, characterized in that a second heat exchanger for reducing the heat load of the generator by heating in advance is provided on the inlet side of the absorbing dilute solution of the generator.   The supply of the waste water to the second heat exchanger for reducing the heat load of the generator-side first heat exchanger is supplied in parallel independently of the generator-side first heat exchanger. The exhaust heat drive type absorption refrigeration apparatus according to claim 1, wherein   The supply of waste water to the second heat exchanger for reducing the heat load of the generator-side first heat exchanger is connected in series to the second heat exchanger via the generator-side first heat exchanger. The exhaust heat drive type absorption refrigeration apparatus according to claim 1, wherein the exhaust heat drive type absorption refrigeration apparatus is provided.   The supply of the waste water to the generator-side first heat exchanger is supplied in series via the second heat exchanger for reducing the heat load of the generator-side first heat exchanger. The exhaust heat drive type absorption refrigeration apparatus according to claim 1, wherein the exhaust heat drive type absorption refrigeration apparatus is configured.   A solution heat exchanger for exchanging heat between the absorption concentrated solution from the generator and the absorption diluted solution from the absorber; and the two heat exchangers of the solution heat exchanger and the second heat exchanger are respectively concentrated. A three-fluid heat exchanger is formed by integrating a solution and dilute solution, waste hot water and dilute solution through a partition plate so that they flow in a counterflow state to each other. Or the waste heat drive type absorption refrigerating machine of 4.

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