JP5168102B2 - Absorption refrigeration system - Google Patents

Description

  The present invention relates to an absorption refrigeration apparatus, and more particularly to an absorption refrigeration apparatus that can lower the temperature of a heating source of a generator.

  In an absorption refrigeration apparatus (for example, a LiBr absorption refrigeration apparatus), as shown in FIGS. 10 to 13, a refrigerant vapor obtained by heating and concentrating a dilute solution (for example, a LiBr dilute solution) with a generator G. Rs is cooled and liquefied in the condenser C, and the liquefied liquid refrigerant Rw is sprayed on the heat transfer surface of the evaporator E to cool the fluid to be cooled, and the evaporated refrigerant vapor Rs is generated in the absorber A. After absorption with the concentrated solution Lc sent from the generator G, a solution having a reduced concentration (that is, the diluted solution Ld) is sent to the generator G to form an absorption cycle. Here, FIGS. 10 and 12 show an absorption cycle using the refrigerant transient type evaporator E in which the liquid refrigerant Rw from the condenser C is sprayed from the upper part of the evaporator E to the heat transfer surface. 11 and 13, the liquid refrigerant Rw from the condenser C is supplied to the refrigerant reservoir 1 provided at the lower part of the evaporator E, and the liquid refrigerant Rw in the refrigerant reservoir 1 is evaporated by the refrigerant pump Pr. An absorption cycle using a refrigerant circulation evaporator E which is circulated and sprayed from the upper part of the evaporator E to the heat transfer surface is shown. 10 to 13, reference numeral Tc is a cooling tower, Pl is a solution pump for pumping the solution from the absorber A, Pw is a cooling water pump for pumping the cooling water Wc from the cooling tower Tc, and Ha is from the generator G. Is a solution heat exchanger that exchanges heat between the concentrated solution Lc and the dilute solution Ld that is sent to the generator G. 4 is a water-cooled supercooling heat exchanger that supercools the absorbing solution entering the absorber A, and 5 is cooling. It is a cooling water circuit which circulates the cooling water Wc from the tower Tc.

  Accordingly, the temperature of the heating source for heating the dilute solution Ld in the generator G is determined from the temperature required to exchange heat with a solution temperature equal to its saturated vapor temperature at the concentration of the concentrated solution Lc in the generator G. The Rukoto. That is, since the saturated vapor temperature is the solution temperature at a pressure equal to the condensation pressure determined by the condensation temperature in the condenser C, in order to reduce the heating source temperature in the generator G, the condensation in the condenser C ( Pressure) is to reduce the temperature (see FIG. 9).

  For example, in a single-effect refrigeration system using a warm water absorption type that uses cooling water such as a gas engine, when the solution concentration in the generator G is about 60%, the saturation of the solution under the condensation pressure is assumed to be 40 ° C. The solution temperature equal to the steam temperature is from 85 ° C., and the heat source temperature is about 90 ° C., that is, the exhaust water temperature of the gas engine must be higher than this temperature (see cycle (A) in FIG. 9). If the heat source temperature for heating the solution of the generator G can be lowered, solar heat or the like can be used as the hot water for heating, and the use range of the exhaust heat absorption refrigeration apparatus can be greatly expanded. In order to reduce the condensation temperature, it is necessary to reduce the cooling air temperature or reduce the outlet solution concentration (LiBr solution concentration) of the generator G to lower the saturated vapor temperature.

  However, in the case of a water-cooled condenser, the condensation temperature at the rated operation of the absorption refrigeration apparatus is a temperature at which heat is exchanged with the cooling water in the cooling tower (cooling tower) Tc, and the temperature of the cooling water is evaporated at the outside air temperature. Since it is determined by the temperature and is about 32 ° C. at the rated time, the cooling water generally flows into the condenser C after leaving the absorber A, so that the condensation temperature is made 40 ° C. or less. It is necessary to enlarge the cooling tower Tc and the condenser C, which is not practical. Even if the cooling water flows into the absorber A and the condenser C in parallel, the condensation temperature is somewhat lowered, but the heat source temperature cannot be greatly reduced. In order to lower the heating source temperature by about 10 ° C., it is necessary to lower the condensation temperature by about 7 to 10 ° C. to 30 to 33 ° C. (see cycle (A ′) in FIG. 9).

  Moreover, reducing the heat source temperature by greatly reducing (thinning) the outlet solution (for example, LiBr solution) concentration Lc of the generator G means that the evaporation temperature in the evaporator E is equal to the inlet solution temperature of the absorber A. Since the concentration is determined by the outlet solution concentration Lc of the generator G, a concentrated solution (for example, a LiBr concentrated solution) Lc at the inlet of the absorber A is used to obtain a low cold water temperature (that is, a fluid temperature to be cooled). In order to obtain the same evaporation temperature, it is necessary to lower the temperature of the concentrated solution Lc at the inlet of the absorber A, and the solution temperature is inevitably determined (see cycle (C) in FIG. 9). . That is, at a low (thin) solution concentration of the generator G at a low heating source temperature, the evaporation temperature increases at the inlet solution temperature of the same absorber A (see cycle (B) in FIG. 9), and the evaporator during rated operation The cold water temperature (cooled fluid temperature) at E cannot be lowered as prescribed, and it is difficult to simply lower the solution concentration at the generator G and lower the heating source temperature.

  As a means for lowering the temperature of the heating source of the generator, in this case, in the absorption refrigeration apparatus, two units in which an evaporator and an absorber are combined are prepared, and the absorber constituting one unit is prepared. A reflux circuit is provided to return the dilute solution from the outlet to the upper part of the absorber constituting one unit through the heat exchange part of the evaporator constituting one unit and the heat exchanging part of the absorber constituting the other unit. Thus, the temperature of the heating source of the generator can be lowered (see Patent Document 1). However, in this case, it is necessary to prepare two units in which an evaporator and an absorber are combined, and there is a demerit that the overall size of the apparatus cannot be avoided.

JP2007-271165A

  In the present invention, the non-evaporated portion of the liquid refrigerant spread on the heat transfer surface of the evaporator is stored in the lower refrigerant pool, and this non-evaporated refrigerant is sent to the cooling water heat exchanger that cools the absorber by the refrigerant pump. Then, the temperature of the cooling water for cooling the absorber is lowered and the pressure of the absorber is lowered so that a low evaporation temperature can be obtained. As a result, the solution concentration in the generator can be lowered, the saturated solution temperature can be lowered, and the temperature of the heating source of the generator can be lowered.

  The present invention has been made in view of the above points, and by reducing the pressure of the absorber, enabling a low evaporation temperature, thereby reducing the concentration of the absorbing solution in the generator and lowering the saturated vapor temperature. The object is to reduce the temperature of the heat source of the generator without increasing the size of the apparatus.

  In the present invention, as a first means for solving the above problems, the generator G, the condenser C that condenses and liquefies the refrigerant vapor Rs obtained from the generator G, and the liquid condensed and liquefied by the condenser C An evaporator E for evaporating and evaporating the refrigerant Rw, and a refrigerant solution Rc evaporated and evaporated by the evaporator E is absorbed in the concentrated solution Lc obtained by the generator G, and a dilute solution Ld supplied to the generator G is obtained. In the absorption refrigeration apparatus including the absorber A to be generated and configured to cool the absorber A using the cooling water Wc cooled by the outside air by the cooling tower Tc, the evaporation E is disposed below the evaporator E. A refrigerant pool 1 is provided for collecting the unevaporated liquid refrigerant Rw sprayed on the heat transfer surface of the vessel E, and a cooling means X is provided for using the liquid refrigerant Rw in the refrigerant pool 1 as a cooling heat source for the cooling water Wc. doing.

  With the above configuration, the unevaporated liquid refrigerant Rw spread on the heat transfer surface of the evaporator E is used as a cooling heat source for the cooling water Wc for cooling the absorber, and the cooling water temperature of the absorber A is By lowering and lowering the pressure of the absorber A, a low evaporation temperature is obtained. As a result, the solution concentration in the generator G can be lowered, the saturated solution temperature can be lowered, and the temperature of the heating source of the generator G can be lowered.

  In the present invention, as a second means for solving the above problems, in the absorption refrigeration apparatus provided with the first means, the cooling means X is used, the liquid refrigerant Rw in the refrigerant reservoir 1 is used as a refrigerant pump. It can also be constituted by a refrigerant circulation circuit 3 that supplies heat to the cooling water heat exchanger 2 that exchanges heat with the cooling water Wc via Pr. In such a case, the refrigerant pool 1 and heat exchange for cooling water are provided. With a simple configuration in which the cooler 2 and the refrigerant circulation circuit 3 are attached, the pressure of the absorber A can be lowered, and the evaporation temperature can be lowered.

  In the present invention, as a third means for solving the above-described problem, in the absorption refrigeration apparatus including the second means, one of the cooling water Wc cooled by the heat exchanger 2 for cooling water is used. The cooling water circuit 6 for sending the liquid to the heat transfer surface of the condenser C can be provided, and in this case, the cooling water Wc cooled by the cooling water heat exchanger 2 is configured. The liquid is fed into the heat transfer surface of the condenser C via the cooling water circuit 6, the condensation temperature can be lowered, and the temperature of the heating source of the generator G can be lowered. Become.

  In the present invention, as a fourth means for solving the above-described problem, in the absorption refrigeration apparatus including the second or third means, the absorption solution Ld entering the absorber A is supercooled. A supercooling heat exchanger 4 is provided, and a cooling water circuit 7 for sending the cooling water Wc cooled by the cooling water heat exchanger 2 to the supercooling heat exchanger 4 is also provided. In such a configuration, the absorber A simply absorbs the refrigerant vapor, and the absorption heat is removed by the sensible heat of the supercooled absorption solution Ld (in other words, solution separation cooling). Method).

  In the present invention, as a fifth means for solving the above problems, in the absorption refrigeration apparatus provided with the first, second, third or fourth means, as a heating source of the generator G Exhaust heat can also be used, and in such a configuration, a slightly low temperature exhaust heat hot water can be used effectively.

  In the present invention, furthermore, as a sixth means for solving the above-mentioned problems, in the absorption refrigeration apparatus provided with the fifth means, solar heat can be used as the exhaust heat, and when configured as such The range of use of the absorption refrigeration apparatus can be greatly expanded.

  According to the first means of the present invention, the generator G, the condenser C that condenses and liquefies the refrigerant vapor Rs obtained from the generator G, and the liquid refrigerant Rw condensed and liquefied by the condenser C is evaporated. An evaporator A and an absorber A that absorbs the refrigerant vapor Rs evaporated by the evaporator E into the concentrated solution Lc obtained by the generator G to generate a diluted solution Ld supplied to the generator G. In the absorption refrigeration apparatus comprising the cooling water Wc cooled by outside air by the cooling tower Tc and configured to cool the absorber A, a heat transfer surface of the evaporator E is disposed below the evaporator E. A refrigerant reservoir 1 is provided for storing the unevaporated liquid refrigerant Rw sprayed on the refrigerant, and a cooling means X is provided for using the liquid refrigerant Rw in the refrigerant reservoir 1 as a cooling heat source for the cooling water Wc. Absorbed by the non-evaporated liquid refrigerant Rw sprayed on the heat transfer surface Since it is used as a cooling heat source for the cooling water Wc for cooling and a low evaporation temperature is obtained by lowering the pressure of the absorber A, the solution concentration in the generator G can be lowered, and the saturated solution temperature The temperature of the heating source of the generator G can be lowered.

  As in the second means of the present invention, in the absorption refrigeration apparatus having the first means, the cooling means X is used to supply the liquid refrigerant Rw in the refrigerant reservoir 1 to the cooling water Wc via the refrigerant pump Pr. The refrigerant circulation circuit 3 that feeds the cooling water heat exchanger 2 that exchanges heat with the refrigerant, and in such a case, the refrigerant reservoir 1, the cooling water heat exchanger 2, the refrigerant circulation circuit 3, With the simple configuration of attaching, it becomes possible to lower the pressure of the absorber A and to lower the evaporation temperature.

  As in the third means of the present invention, in the absorption refrigeration apparatus comprising the second means, a part of the cooling water Wc cooled by the cooling water heat exchanger 2 is supplied to the condenser C. A cooling water circuit 6 for sending liquid in the heat transfer surface can also be provided. In such a configuration, a part of the cooling water Wc cooled by the cooling water heat exchanger 2 passes through the cooling water circuit 6. Thus, the liquid is fed into the heat transfer surface of the condenser C, the condensation temperature can be lowered, and the temperature of the heating source of the generator G can be lowered.

  As in the fourth means of the present invention, in the absorption refrigeration apparatus having the second or third means, a supercooling heat exchanger 4 for supercooling the absorbing solution Ld entering the absorber A is additionally provided. In addition, a cooling water circuit 7 for sending the cooling water Wc cooled by the cooling water heat exchanger 2 to the supercooling heat exchanger 4 can be additionally provided. In the absorber A, it is possible to adopt an indirect water cooling method (in other words, a solution separation cooling method) in which the absorption heat is removed by sensible heat of the supercooled absorption solution Ld simply by absorbing the refrigerant vapor.

  As in the fifth means of the present invention, in the absorption refrigeration apparatus provided with the first, second, third or fourth means, exhaust heat can also be used as a heating source of the generator G, In such a configuration, a slightly low temperature exhaust heat hot water can be used effectively.

  As in the sixth means of the present invention, in the absorption refrigeration apparatus provided with the fifth means, solar heat can be used as the exhaust heat, and in such a case, the utilization range of the absorption refrigeration apparatus Can be greatly expanded.

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

First Embodiment FIG. 1 shows an absorption refrigeration cycle in an absorption refrigeration apparatus according to a first embodiment of the present invention.

  In this absorption refrigeration cycle, in order to recover the refrigerant absorption capacity of an aqueous solution (hereinafter simply referred to as an absorption solution) of an absorbent (for example, LiBr) having an excellent ability to absorb a refrigerant (for example, water), the solution is heated to a heating medium. A generator G for heating and concentrating with (for example, waste water), and a condenser C for liquefying by introducing steam (refrigerant) Rs separated from the solution in the generator G and cooling it; An evaporator E that introduces the refrigerant Rw liquefied by the condenser C and evaporates (vaporizes) it under a low pressure, and a concentration in the generator G to absorb the vapor (refrigerant) Rs generated in the evaporator E. An absorber A for spraying the concentrated solution Lc, and a solution (dilute solution) Ld diluted by absorbing the vapor (refrigerant) Rs in the absorber A for re-feeding to the generator G With solution pump Pl A cooling tower Tc that cools the cooling water Wc that cools the absorber A, and a cooling water pump Pw that feeds the cooling water Wc cooled by the cooling tower Tc into the heat transfer surface of the absorber A. Has been. Reference numeral Ha denotes a solution heat exchanger for exchanging heat between a part of the diluted solution Ld output from the absorber A (the diluted solution Ld supplied to the generator G) and the concentrated solution Lc output from the generator G. In this absorption refrigeration cycle, a refrigerant transient type evaporator E in which the liquid refrigerant Rw from the condenser C is sprayed from the upper part of the evaporator E to the heat transfer surface is used.

  In the absorption refrigeration cycle, the evaporator E and the absorber A are integrated to form a unit U. In the evaporator E, the condensed water (liquid refrigerant) Rw supplied from the condenser C exchanges heat with the water (cooled fluid) flowing inside, evaporates, and cold water is obtained as a heat source on the use side. On the other hand, in the absorber A, the vapor (refrigerant) Rs obtained from the evaporator E is absorbed by the concentrated solution Lc supplied from the generator G, whereby the solution concentration is diluted. . In this case, inside the heat transfer surface of the absorber A, the cooling water Wc cooled by the cooling tower Tc is supplied through the cooling water circuit 5, and the absorbed heat is removed by the cooling water Wc. ing. Further, in the present embodiment, the cooling water Wc cooled by the outside air in the cooling tower Tc enters the heat transfer surface of the condenser C via the branched cooling water circuit 5a branched from the cooling water circuit 5. It is supposed to be sent. That is, the condenser C is water-cooled.

  In the present embodiment, the lower part of the evaporator E is provided with a refrigerant reservoir 1 for accumulating the unevaporated liquid refrigerant Rw sprayed on the heat transfer surface of the evaporator E. A refrigerant circulation circuit 3 for supplying the liquid refrigerant Rw to the cooling water heat exchanger 2 for exchanging heat with the cooling water Wc flowing through the cooling water circuit 5 via the refrigerant pump Pr is attached. The refrigerant circulation circuit 3 constitutes a cooling means X used as a cooling heat source for the cooling water Wc flowing through the cooling water circuit 5.

By configuring as described above, the unevaporated portion of the liquid refrigerant Rw spread on the heat transfer surface of the evaporator E is used as a cooling heat source of the cooling water Wc for cooling the absorber, and the cooling water temperature of the absorber A is By lowering and lowering the pressure of the absorber A, a low evaporation temperature is obtained. Therefore, the solution concentration in the generator G can be lowered, the saturated solution temperature can be lowered, and the temperature of the heating source of the generator G can be lowered. That is, the heating source temperature of the generator G in the conventional absorption refrigeration apparatus (shown in FIGS. 10 to 13) is as shown in the cycle (A) of FIG.
If the evaporation temperature of the evaporator E is 5 ° C. in order to obtain cold water, about 90 ° C. is necessary. In the case of this embodiment, as shown in cycles (B) and (C) of FIG. By reducing (thinning) the solution concentration, it becomes possible to set the heating source temperature to about 80 ° C., and as the heating source of the generator G, exhaust hot water (for example, hot water by solar heat) can be used. It is.

  However, the evaporation temperature in the cycle (A) of FIG. 9 is 5 ° C. from the high (dense) solution concentration at the absorber inlet, but the cycle (B) of FIG. 9 when the solution concentration is simply lowered (thin). Then, when the solution concentration is 56.5% and the inlet temperature of the absorber is the same, the evaporation temperature becomes as high as 10 ° C.

  Therefore, in the present embodiment, as shown in the cycle (C) in FIG. 9, the evaporation temperature can be made equal to the cycle (A) by lowering the absorber inlet temperature in the cycle (B). It is doing so. The inlet temperature of the absorber A can be made lower than the cycle (C) in FIG. 9, and the solution concentration at the inlet of the absorber A can be made lower (thinner). Can be further reduced.

Second Embodiment FIG. 2 shows an absorption refrigeration cycle in an absorption refrigeration apparatus according to a second embodiment of the present invention.

  In this case, the evaporator E is a refrigerant circulation system. That is, the liquid refrigerant Rw from the condenser C merges at the outlet side of the cooling water heat exchanger 2 in the refrigerant circulation circuit 3 in which the unevaporated refrigerant in the refrigerant pool 1 circulates in the cooling water heat exchanger 2. The liquid refrigerant Rw branched from the inlet side of the cooling water heat exchanger 2 in the refrigerant circulation circuit 3 is scattered from the upper part of the evaporator E to the heat transfer surface. In this case, in the case of the refrigerant circulation type evaporator E, since the refrigerant reservoir 1 is already attached, the configuration can be further simplified. Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Third Embodiment FIG. 3 shows an absorption refrigeration cycle in an absorption refrigeration apparatus according to a third embodiment of the present invention.

  In this case, a cooling water circuit 6 for supplying a part of the cooling water Wc cooled by the cooling water heat exchanger 2 into the heat transfer surface of the condenser C is provided. In this case, the branch cooling water circuit 5a branched from the cooling water circuit 5 to the condenser C is omitted. If it does in this way, a part of cooling water Wc cooled with the heat exchanger 2 for cooling water will be sent in the heat-transfer surface of the condenser C via the cooling water circuit 6, and a condensation temperature fall | descends. Thus, the temperature of the heating source of the generator G can be further lowered. Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Fourth Embodiment FIG. 4 shows an absorption refrigeration cycle in an absorption refrigeration apparatus according to a fourth embodiment of the present invention.

  In this case, a cooling water circuit 6 for supplying a part of the cooling water Wc cooled by the cooling water heat exchanger 2 into the heat transfer surface of the condenser C is provided. In this case, the branch cooling water circuit 5a branched from the cooling water circuit 5 to the condenser C is omitted. If it does in this way, a part of cooling water Wc cooled with the heat exchanger 2 for cooling water will be sent in the heat-transfer surface of the condenser C via the cooling water circuit 6, and a condensation temperature fall | descends. Thus, the temperature of the heating source of the generator G can be further lowered.

  In this case, the evaporator E is a refrigerant circulation system. That is, the liquid refrigerant Rw from the condenser C merges at the outlet side of the cooling water heat exchanger 2 in the refrigerant circulation circuit 3 in which the unevaporated refrigerant in the refrigerant pool 1 circulates in the cooling water heat exchanger 2. The liquid refrigerant Rw branched from the inlet side of the cooling water heat exchanger 2 in the refrigerant circulation circuit 3 is scattered from the upper part of the evaporator E to the heat transfer surface. In this case, in the case of the refrigerant circulation type evaporator E, since the refrigerant reservoir 1 is already attached, the configuration can be further simplified.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Fifth Embodiment FIG. 5 shows an absorption refrigeration cycle in an absorption refrigeration apparatus according to a fifth embodiment of the present invention.

  In this case, a supercooling heat exchanger 4 for supercooling the absorbing solution Ld entering the absorber A is attached, and the cooling water Wc cooled by the cooling water heat exchanger 2 is used as the supercooling heat exchange. A cooling water circuit 7 for feeding liquid to the vessel 4 is attached. In this way, the absorber A simply absorbs the refrigerant vapor and adopts an indirect water cooling method (in other words, a solution separation cooling method) in which the absorbed heat is removed by the sensible heat of the supercooled absorption solution Ld. can do. Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Sixth Embodiment FIG. 6 shows an absorption refrigeration cycle in an absorption refrigeration apparatus according to a sixth embodiment of the present invention.

  In this case, a supercooling heat exchanger 4 for supercooling the absorbing solution Ld entering the absorber A is attached, and the cooling water Wc cooled by the cooling water heat exchanger 2 is used as the supercooling heat exchange. A cooling water circuit 7 for feeding liquid to the vessel 4 is attached. In this way, the absorber A simply absorbs the refrigerant vapor and adopts an indirect water cooling method (in other words, a solution separation cooling method) in which the absorbed heat is removed by the sensible heat of the supercooled absorption solution Ld. can do.

  In this case, the evaporator E is a refrigerant circulation system. That is, the liquid refrigerant Rw from the condenser C merges at the outlet side of the cooling water heat exchanger 2 in the refrigerant circulation circuit 3 in which the unevaporated refrigerant in the refrigerant pool 1 circulates in the cooling water heat exchanger 2. The liquid refrigerant Rw branched from the inlet side of the cooling water heat exchanger 2 in the refrigerant circulation circuit 3 is scattered from the upper part of the evaporator E to the heat transfer surface. In this case, in the case of the refrigerant circulation type evaporator E, since the refrigerant reservoir 1 is already attached, the configuration can be further simplified.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Seventh Embodiment FIG. 7 shows an absorption refrigeration cycle in an absorption refrigeration apparatus according to a seventh embodiment of the present invention.

  In this case, a supercooling heat exchanger 4 for supercooling the absorbing solution Ld entering the absorber A is attached, and the cooling water Wc cooled by the cooling water heat exchanger 2 is used as the supercooling heat exchange. A cooling water circuit 7 for feeding liquid to the vessel 4 is attached. Then, the cooling water Wc cooled by the outside air in the cooling tower Tc passes through the cooling water circuit 6 branched from the cooling water circuit 7 before entering the supercooling heat exchanger 4 and is in the heat transfer surface of the condenser C. It is supposed to be sent to. If it does in this way, a part of cooling water Wc cooled with the heat exchanger 2 for cooling water will be sent in the heat-transfer surface of the condenser C via the cooling water circuit 6, and a condensation temperature fall | descends. Thus, the temperature of the heating source of the generator G can be further lowered. Moreover, in the absorber A, an indirect water cooling method (in other words, a solution separation cooling method) in which the absorption heat is removed by sensible heat of the supercooled absorption solution Ld simply by absorbing the refrigerant vapor is adopted. it can. Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Eighth Embodiment FIG. 8 shows an absorption refrigeration cycle in an absorption refrigeration apparatus according to an eighth embodiment of the present invention.

  In this case, a supercooling heat exchanger 4 for supercooling the absorbing solution Ld entering the absorber A is attached, and the cooling water Wc cooled by the cooling water heat exchanger 2 is used as the supercooling heat exchange. A cooling water circuit 7 for feeding liquid to the vessel 4 is attached. Then, the cooling water Wc cooled by the outside air in the cooling tower Tc passes through the cooling water circuit 6 branched from the cooling water circuit 7 before entering the supercooling heat exchanger 4 and is in the heat transfer surface of the condenser C. It is supposed to be sent to. If it does in this way, a part of cooling water Wc cooled with the heat exchanger 2 for cooling water will be sent in the heat-transfer surface of the condenser C via the cooling water circuit 6, and a condensation temperature fall | descends. Thus, the temperature of the heating source of the generator G can be further lowered. Moreover, in the absorber A, an indirect water cooling method (in other words, a solution separation cooling method) in which the absorption heat is removed by sensible heat of the supercooled absorption solution Ld simply by absorbing the refrigerant vapor is adopted. it can.

  In this case, the evaporator E is a refrigerant circulation system. That is, the liquid refrigerant Rw from the condenser C merges at the outlet side of the cooling water heat exchanger 2 in the refrigerant circulation circuit 3 in which the unevaporated refrigerant in the refrigerant pool 1 circulates in the cooling water heat exchanger 2. The liquid refrigerant Rw branched from the inlet side of the cooling water heat exchanger 2 in the refrigerant circulation circuit 3 is scattered from the upper part of the evaporator E to the heat transfer surface. In this case, in the case of the refrigerant circulation type evaporator E, since the refrigerant reservoir 1 is already attached, the configuration can be further simplified.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

  The invention of the present application is not limited to the above-described embodiments, and it goes without saying that the design can be changed as appropriate without departing from the scope of the invention.

It is an absorption refrigeration cycle in the absorption refrigeration apparatus according to the first embodiment of the present invention. It is an absorption refrigerating cycle in the absorption refrigeration apparatus concerning 2nd Embodiment of this invention. It is an absorption refrigerating cycle in the absorption refrigeration apparatus concerning 3rd Embodiment of this invention. It is an absorption refrigeration cycle in an absorption refrigeration apparatus according to a fourth embodiment of the present invention. It is an absorption refrigeration cycle in the absorption refrigeration apparatus concerning the 5th Embodiment of this invention. It is an absorption refrigerating cycle in the absorption refrigeration apparatus concerning the 6th Embodiment of this invention. It is an absorption refrigerating cycle in the absorption refrigeration apparatus concerning the 7th Embodiment of this invention. It is an absorption refrigeration cycle in the absorption refrigeration apparatus concerning the 8th Embodiment of this invention. It is a solution cycle diagram in the absorption refrigeration apparatus concerning the conventional absorption refrigeration apparatus and each embodiment of this invention. It is an absorption refrigeration cycle of a conventional water-cooled absorption refrigeration apparatus including a refrigerant transient evaporator. It is an absorption refrigeration cycle of a conventional water-cooled absorption refrigeration apparatus including a refrigerant circulation type evaporator. It is an absorption refrigeration cycle of a conventional indirect water-cooled absorption refrigeration apparatus equipped with a refrigerant transient type evaporator. It is an absorption refrigeration cycle of a conventional indirect water-cooled absorption refrigeration apparatus including a refrigerant circulation type evaporator.

Explanation of symbols

1 is a refrigerant reservoir 2 is a cooling water heat exchanger 3 is a refrigerant circulation circuit 4 is a supercooling heat exchanger 6 and 7 is a cooling water circuit A is an absorber C is a condenser E is an evaporator G is a generator Lc is Absorbing solution (concentrated solution)
Ld is dilute solution Pl is solution pump Pr is refrigerant pump Rs is refrigerant vapor Rw is liquid refrigerant Tc is cooling tower Wc is cooling water X is cooling means

Claims (6)

  Generator (G), condenser (C) for condensing and liquefying refrigerant vapor (Rs) obtained from generator (G), and vaporizing and condensing liquid refrigerant (Rw) condensed and liquefied by condenser (C) The evaporator (E) to be evaporated and the refrigerant vapor (Rs) evaporated by the evaporator (E) are absorbed by the concentrated solution (Lc) obtained by the generator (G) and supplied to the generator (G). An absorber (A) that generates a supplied dilute solution (Ld) is provided, and the absorber (A) is cooled using cooling water (Wc) cooled by outside air by a cooling tower (Tc). In the absorption refrigeration apparatus, a refrigerant reservoir (1) for accumulating an unevaporated portion of the liquid refrigerant (Rw) sprayed on the heat transfer surface of the evaporator (E) is provided below the evaporator (E). A cooling hand that uses the liquid refrigerant (Rw) in the refrigerant pool (1) as a cooling heat source for the cooling water (Wc). Absorption refrigerating apparatus characterized by annexed to (X).   The cooling means (X) sends the liquid refrigerant (Rw) in the refrigerant reservoir (1) to the cooling water heat exchanger (2) that exchanges heat with the cooling water (Wc) via the refrigerant pump (Pr). 2. The absorption refrigeration apparatus according to claim 1, wherein the absorption refrigeration apparatus is constituted by a refrigerant circulation circuit (3) to be fed.   A cooling water circuit (6) for sending a part of the cooling water (Wc) cooled by the cooling water heat exchanger (2) into the heat transfer surface of the condenser (C); The absorption refrigeration apparatus according to claim 2, characterized in that:   A cooling water (Wc) cooled by the cooling water heat exchanger (2) and a supercooling heat exchanger (4) for supercooling the absorbing solution (Ld) entering the absorber (A) The absorption refrigeration apparatus according to any one of claims 2 and 3, further comprising a cooling water circuit (7) for sending the water to the supercooling heat exchanger (4).   The absorption refrigeration apparatus according to any one of claims 1, 2, 3 and 4, wherein exhaust heat is used as a heating source of the generator (G).   6. The absorption refrigeration apparatus according to claim 5, wherein solar heat is used as the exhaust heat.

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