JP4572860B2 - Absorption refrigeration system - Google Patents

Description

  The present invention relates to an absorption refrigeration apparatus.

  LiBr type absorption refrigeration apparatuses that utilize changes in the concentration of LiBr aqueous solution are well known in the past. In this type of absorption refrigeration apparatus, the solution (concentrated solution) that enters the absorber is used as an air-cooled heat exchanger. In the absorber, an indirect air cooling (solution separation cooling) system in which only the refrigerant vapor (water vapor) is absorbed by the solution has been proposed (see Patent Document 1).

JP-A-7-98163.

  By the way, when the indirect air cooling (solution separation cooling) method disclosed in Patent Document 1 is adopted, the mass transfer called absorption of refrigerant vapor and the heat transfer called cooling are separated, so the absorber is downsized. However, since the absorption heat of the refrigerant vapor is processed only by the sensible heat of the supercooled solution, the solution temperature at the absorber outlet is the case of the conventional direct air cooling method. The evaporating temperature in the evaporator rises and the cold water outlet temperature (that is, the use side temperature) in the evaporator becomes difficult to decrease. In addition, when the indirect air cooling method is employed, the exhaust heat temperature in the generator is also increased, resulting in a problem that the amount of exchange heat in the generator is reduced.

  The present invention has been made in view of the above points, and it is an object of the present invention to make it possible to reduce the temperature of the chilled water outlet (that is, the use side temperature) and to reduce the exhaust heat temperature at the generator. It is said.

  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 refrigerant condensed and liquefied by the condenser C The evaporator E for evaporating Rw and the refrigerant vapor Rs evaporated by the evaporator E are absorbed by the concentrated solution Lc obtained by the generator G to generate a dilute solution Ld supplied to the generator G. In the absorption refrigeration apparatus provided with the absorber A, the two units U, U formed by horizontally aligning the evaporator E and the absorber A are disposed, and one unit U is configured. Most of the dilute solution Ld from the outlet of the absorber A is used for the heat exchange part 7 of the evaporator E constituting one unit U, the heat exchange part 8 and the air-cooling heat exchange in the absorber A constituting the other unit U. One unit U is configured via the vessel Ha. The reflux circuit 6 for recirculating the top of the absorber A to have attached.

  By configuring as described above, most of the dilute solution Ld from the outlet of the absorber A that constitutes one unit U is the heat exchange section 7 of the evaporator E that constitutes one unit U, and the other unit. It is refluxed to the upper part of the absorber A constituting one unit U in a supercooled state via the heat exchanging part 8 and the air cooling heat exchanger Ha of the absorber A constituting U, but the absorption constituting the one unit U Part of the dilute solution Ld from the outlet of the vessel A is concentrated in the generator G to become a concentrated solution, and the concentrated solution Lc is supplied to the upper part of the absorber A constituting the other unit U. Therefore, in the units U and U, the refrigerant vapor Rs evaporated in the other evaporator E is absorbed by the concentrated solution Ld in the other absorber A, and the solution diluted by the absorption of the refrigerant vapor Rs is in the one side. It flows into the absorber A. The absorbed heat generated at that time is removed by the sensible heat of the diluted solution Ld cooled in the heat exchange section 7 of the evaporator E on one side. On the other hand, the absorber A on one side absorbs the refrigerant vapor Rs evaporated by the evaporator E on one side and further dilutes, and the absorbed heat generated at that time is removed by the sensible heat held by the supercooled solution. It will be. The other side of the absorber A is cooled by the dilute solution Ld cooled by the one side of the evaporator E, so that the evaporation temperature in the other side of the evaporator E can be lowered and the one side of the evaporator E The evaporating temperature can be increased, the refrigerating capacity on the other side can be ensured, and the temperature of the heating medium (for example, waste water) Wh in the generator G is lowered, so that the heating amount in the generator G Will increase.

  In the present invention, as a second means for solving the above-described problem, in the absorption refrigeration apparatus provided with the first means, the units U and U can be stacked in two stages in the vertical direction. In such a configuration, since the refrigerant and the absorbing solution can flow down from the upper unit U to the lower unit U using the head difference, the assembly structure of the units U and U is simplified. It becomes.

  In the present invention, as a third means for solving the above problems, in the absorption refrigeration apparatus provided with the first means, the units U and U can be installed in parallel. When configured, the installation height of the units U and U can be suppressed.

  In the present invention, as the fourth means for solving the above-mentioned problems, in the absorption refrigeration apparatus provided with the first, second or third means, the air-cooled heat exchanger Ha in the reflux circuit 6 is provided. A junction 9 for joining a part of the concentrated solution Lc from the generator G can be provided on the outlet side of the generator G. In such a configuration, most of the diluted solution Ld from the absorber A on one side is provided. Is in a supercooled state via the heat exchanger 7 of the evaporator E on one side, the heat exchanger 8 of the absorber A on the other side, and the air-cooled heat exchanger Ha, and the generator G on the outlet side of the air-cooled heat exchanger Ha After being joined with a part of the concentrated solution Lc from, the refrigerant is refluxed to the upper part of the absorber A on one side, the amount of heat generated in the absorber A on one side can be suppressed, and the absorption heat can be easily removed. It becomes. Although the temperature of the solution refluxed to the absorber A on one side is slightly higher, there is no problem because the amount of the concentrated solution Lc from the generator G is small.

  In the present invention, as the fifth means for solving the above-mentioned problems, in the absorption refrigeration apparatus including the first, second, or third means, the air-cooled heat exchanger Ha in the reflux circuit 6 is provided. A junction 10 for joining a part of the concentrated solution Lc from the generator G can be provided on the inlet side of the generator G. In such a configuration, most of the diluted solution Ld from the absorber A on one side can be provided. Passes through the heat exchanging part 7 of the evaporator E on one side and the heat exchanging part 8 of the absorber A on the other side, and then generates a part of the concentrated solution Lc that is concentrated by generating the refrigerant vapor Rs in the generator G. In the state of being joined and supercooled by the air-cooled heat exchanger Ha, it will be refluxed to the upper part of the absorber A on one side, and the amount of heat generated in the absorber A on the one side can be suppressed, It is possible to keep the solution temperature refluxed to the absorber A low. , Removal of absorption heat becomes easier.

  In the present invention, as the sixth means for solving the above-described problem, in the absorption refrigeration apparatus including the first, second or third means, the air-cooled heat exchanger Ha in the reflux circuit 6 is provided. Is provided with a junction 11 for joining all of the concentrated solution Lc from the generator G, and on the outlet side of the air-cooled heat exchanger Ha in the reflux circuit 6, the upper side of the absorber A on the other side. A branch circuit 12 for supplying a part of the supercooled solution can be attached to the main body. In such a configuration, most of the solution from the absorber A on one side is exchanged with the heat of the evaporator E on one side. After passing through the part 7 and the heat exchanging part 8 of the absorber A on the other side, the refrigerant vapor Rs is generated in the generator G and merged with all the concentrated solution Lc concentrated, and is supercooled in the air-cooled heat exchanger Ha. One side and the other side absorber A, A As a result, the temperature of the absorbing solution supplied to the absorber A on the other side is lowered, the amount of heat generated in the absorber A on one side can be suppressed, and the absorber A is returned to the absorber A on the one side. The solution temperature can be kept low, and the absorption heat can be removed more easily.

  In the present invention, as a seventh means for solving the above-mentioned problem, in the absorption refrigeration apparatus comprising the first, second, third, fourth, fifth or sixth means, a heating medium Wh is provided in series with two generators G, G, and two air-cooled condensers C, C for condensing refrigerant vapor Rs generated in each of the generators G, G, respectively, and an evaporator E on the other side In addition, the refrigerant Rw generated by the heating medium Wh having a high temperature and condensed by one air-cooled condenser C is supplied to the evaporator E on the one side, and generated by the heating medium Wh having a low temperature by the other air-cooling condenser C. The refrigerant Rw condensed in the condenser C can also be supplied. In such a case, the concentration of the solution to be heated on the heated side changes depending on the temperature level of the heating medium Wh. Ownership of medium Wh That heat will be able to effectively utilize the exhaust heat recovery efficiency when using the exhaust hot water is to be increased as the heating medium Wh.

  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 evaporation that evaporates and evaporates the refrigerant Rw condensed and liquefied by the condenser C. 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 to be supplied to the generator G. In the absorption refrigeration apparatus, two units U, U formed by horizontally aligning the evaporator E and the absorber A are disposed, and from the outlet of the absorber A constituting one unit U. Most of the dilute solution Ld is passed through the heat exchanger 7 of the evaporator E constituting one unit U, the heat exchanger 8 in the absorber A constituting the other unit U, and the air-cooled heat exchanger Ha. Reflux to the upper part of the absorber A composing the unit U In the units U and U, the refrigerant vapor Rs evaporated by the other evaporator E is absorbed by the concentrated solution Ld and diluted by absorption of the refrigerant vapor Rs in the units U and U. The absorbed solution flows into the absorber A on one side, and the absorption heat generated at that time is removed by the sensible heat of the diluted solution Ld cooled in the heat exchanging portion 7 of the evaporator E on the one side. In the absorber A, the refrigerant vapor Rs evaporated in the evaporator E on one side is absorbed and further diluted, and the absorbed heat generated at that time is removed by the sensible heat possessed by the supercooled solution. The other-side absorber A is cooled by the diluted solution Ld cooled by the one-side evaporator E, so that the evaporation temperature in the other-side evaporator E can be lowered, and the one-side evaporator Evaporation temperature at E And the refrigerating capacity on the other side can be ensured, and the temperature of the heating medium (for example, exhaust hot water) Wh in the generator G is lowered, and the heating amount in the generator G is increased. effective.

  As in the second means of the present invention, in the absorption refrigeration apparatus provided with the first means, the units U, U can be stacked in two stages in the vertical direction, and when configured as such, Since the refrigerant and the absorbing solution can flow down from the upper unit U to the lower unit U using the head difference, the assembly structure of the units U and U is simplified.

  As in the third means of the present invention, in the absorption refrigeration apparatus provided with the first means, the units U and U can be installed in parallel. In such a case, the units U and U The installation height can be suppressed.

  In the absorption refrigeration apparatus having the first, second or third means as in the fourth means of the present invention, the generator is provided on the outlet side of the air-cooled heat exchanger Ha in the reflux circuit 6. It is also possible to provide a junction 9 for joining a part of the concentrated solution Lc from G, and in such a case, most of the diluted solution Ld from the one-side absorber A is mostly used as the evaporator E on one side. Of the concentrated solution Lc from the generator G on the outlet side of the air-cooling heat exchanger Ha. , The amount of absorbed heat generated in the absorber A on one side can be suppressed, and the removal of absorbed heat is facilitated. Although the temperature of the solution refluxed to the absorber A on one side is slightly higher, there is no problem because the amount of the concentrated solution Lc from the generator G is small.

  As in the fifth means of the present invention, in the absorption refrigeration apparatus comprising the first, second or third means, the generator is provided on the inlet side of the air-cooled heat exchanger Ha in the reflux circuit 6. It is also possible to provide a junction 10 where a part of the concentrated solution Lc from G is merged. In such a configuration, most of the diluted solution Ld from the one-side absorber A is mostly used as the evaporator E on one side. After passing through the heat exchanging part 7 and the heat exchanging part 8 of the absorber A on the other side, the refrigerant vapor Rs is generated in the generator G and merged with a part of the concentrated solution Lc, and the air-cooled heat exchanger Ha The solution is refluxed to the upper part of the absorber A on one side in a supercooled state, and the amount of heat generated in the absorber A on the one side can be suppressed, and the solution refluxed to the absorber A on the lower stage side. The temperature can be kept low and the removal of absorbed heat is easier. That.

  In the absorption refrigeration apparatus having the first, second or third means as in the sixth means of the present invention, the generator is provided on the inlet side of the air-cooled heat exchanger Ha in the reflux circuit 6. G is provided with a junction 11 for joining all of the concentrated solution Lc from G, and a part of the supercooled solution is placed on the outlet side of the air-cooled heat exchanger Ha in the reflux circuit 6 and on the upper side of the absorber A on the other side. A branch circuit 12 to be supplied can be provided, and in such a case, most of the solution from the absorber A on one side is mostly the heat exchanger 7 of the evaporator E on one side and the absorber on the other side. After passing through the heat exchange section 8 of A, the refrigerant vapor Rs is generated in the generator G and merged with all of the concentrated solution Lc, and one side and the other side are supercooled in the air-cooled heat exchanger Ha. Will be returned to the absorbers A and A, The temperature of the absorption solution supplied to the absorber A is reduced, the amount of heat generated in the absorber A on one side can be suppressed, and the temperature of the solution returned to the absorber A on the one side can be suppressed low. This makes it easier to remove the absorbed heat.

  In the absorption refrigeration apparatus provided with the first, second, third, fourth, fifth or sixth means as in the seventh means of the present invention, two generations in which the heating medium Wh flows in series And the two air-cooled condensers C and C for condensing the refrigerant vapor Rs generated in the generators G and G, respectively, and the heating medium Wh having a high temperature in the evaporator E on the other side. The refrigerant Rw generated by the air cooling condenser C is supplied to the evaporator E on one side, and is generated by the low-temperature heating medium Wh and condensed in the other air cooling condenser C. Rw can also be configured. In such a configuration, the concentration of the solution to be concentrated on the heated side changes depending on the temperature level of the heating medium Wh, so the heat held by the heating medium Wh is effective. Can be used for Becomes that you can, the exhaust heat recovery efficiency when using the exhaust hot water is to be increased as the heating medium Wh.

  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, the solution is heated so that the refrigerant absorption capability of an aqueous solution (hereinafter simply referred to as a dilute solution) of an absorbent (eg, LiBr) excellent in the capability of absorbing the refrigerant (eg, water) is enhanced. A generator G for heating and concentrating (for example, waste water) Wh, and a condenser C for liquefying by introducing steam (refrigerant) Rs separated from the solution in the generator G and cooling it. The evaporator E that introduces the refrigerant Rw liquefied by the condenser C and evaporates (vaporizes) it under low pressure, and the generator G to absorb the vapor (refrigerant) Rs generated in the evaporator E. Absorber A containing concentrated concentrated solution Lc, and again sent to generator G to concentrate solution (dilute solution) Ld diluted by absorbing vapor (refrigerant) Rs in absorber A. Solution pump P of Some of the rare solution Ld discharged from the solution pump P is constituted by a (mostly) air-cooled heat exchanger to cool it by introducing Ha. Reference symbol Hb denotes a solution heat exchanger that exchanges heat between a part of the diluted solution Ld that has exited from the absorber A (the diluted solution Ld that is supplied to the generator G) and the concentrated solution Lc that has exited from the generator G, and F ₁ A cooling fan that cools the condenser C by air, and F ₂ is a cooling fan that cools the air-cooling heat exchanger Ha by air.

  In the absorption refrigeration cycle, the evaporator E and the absorber A are integrated to form a unit U.

  As shown in FIG. 2, the unit U is configured by horizontally integrating an evaporator E and an absorber A, and in the present embodiment, the units U and U have two stages in the vertical direction. Are stacked. In this case, the assembly structure of the units U and U is simplified because the refrigerant and the absorbing solution can flow down from the upper unit U to the lower unit U using the head difference. Here, the evaporators E and E and the absorbers A and A in the units U and U are configured to communicate with each other.

  In each unit U, a plurality of plates 1, 1... Formed by forming an evaporator E on the left side and an absorber E on the right side are stacked, and the evaporator E is supplied from a condenser C. The condensed water (liquid refrigerant) exchanges heat with the water flowing inside to evaporate, and cold water Wc is obtained as a heat source on the use side, while in the absorber A, the concentrated solution supplied from the generator G The vapor (refrigerant) Rs obtained from the evaporator E is absorbed by Lc, so that the solution concentration is diluted. Reference numeral 2 is a casing that forms the outer shell of the unit U, 3 is a spray tray for evenly spraying the solution supplied to the absorber A, 4 is a cold water passage, and 5 is a porous member that forms the absorber A. In addition, each said plate 1 is manufactured with a heat good conductor (for example, a steel plate, stainless steel, etc.).

  In the present embodiment, most of the dilute solution Ld from the absorber A on one side (that is, the lower side) is transferred to the heat exchange section 7 and the other side of the evaporator E on the one side (that is, the lower side). A reflux circuit 6 is provided for passing through the heat exchanging portion 8 of the absorber A on the side (that is, the upper stage side) and then supercooling with the air-cooled heat exchanger Ha and refluxing the upper part of the absorber A on the lower stage side.

  By configuring as described above, most of the dilute solution Ld from the outlet of the lower-stage absorber A is mainly used for the heat exchange section 7 of the lower-stage evaporator E and the heat-exchange section 8 of the upper-stage absorber A. Then, it is returned to the upper part of the lower absorber A in a supercooled state via the air-cooled heat exchanger Ha, but a part of the dilute solution Ld from the outlet of the lower absorber A is concentrated in the generator G. The concentrated solution Lc is supplied to the upper part of the upper absorber A. Therefore, in the units U and U, in the upper-side absorber A, the refrigerant vapor Rs evaporated by the upper-stage evaporator E is absorbed by the concentrated solution Ld, and the solution diluted by the absorption of the refrigerant vapor Rs is in the lower-stage side. It flows into the absorber A. The absorbed heat generated at that time is removed by the sensible heat of the diluted solution Ld cooled in the heat exchange section 7 of the evaporator E on the lower stage side. On the other hand, in the lower absorber A, the refrigerant vapor Rs evaporated in the lower evaporator E is absorbed and further diluted, and the absorbed heat generated at that time is removed by the sensible heat possessed by the supercooled solution. It will be. The upper absorber A is cooled by the dilute solution Ld cooled by the lower evaporator E, whereby the evaporation temperature in the upper evaporator E can be lowered, and the lower evaporator E The evaporating temperature can be increased, the refrigerating capacity on the upper stage side can be ensured, and the temperature of the heating medium (for example, exhaust hot water) Wh in the generator G is lowered, so that the amount of heating in the generator G Will increase.

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

  In this case, a junction 9 for joining a part of the concentrated solution Lc from the generator G is provided on the outlet side of the air-cooled heat exchanger Ha in the reflux circuit 6. In this way, most of the dilute solution Ld from the lower-stage absorber A is mainly used for the heat exchanger 7 of the lower-stage evaporator E, the heat exchanger 8 of the upper-stage absorber A, and the air-cooled heat exchanger Ha. After being joined to a part of the concentrated solution Lc from the generator G on the outlet side of the air-cooled heat exchanger Ha, the supercooled state is returned to the upper part of the lower-side absorber A, and the lower-side absorption is performed. The amount of absorbed heat generated in the vessel A can be suppressed, and the absorbed heat can be easily removed. Although the temperature of the solution refluxed to the lower absorber A is slightly higher, there is no problem because the amount of the concentrated solution Lc from the generator G is small.

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

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

  In this case, a junction 10 where a part of the concentrated solution Lc from the generator G is merged is provided on the inlet side of the air-cooled heat exchanger Ha in the reflux circuit 6. In this way, most of the dilute solution Ld from the lower absorber A passes through the heat exchanger 7 of the lower evaporator E and the heat exchanger 8 of the upper absorber A, and then the generator The refrigerant vapor Rs is generated in G and merged with a part of the concentrated solution Lc concentrated, and is refluxed to the upper part of the lower absorber A while being supercooled by the air-cooled heat exchanger Ha. The amount of heat generated in the absorber A on the side can be suppressed, and the temperature of the solution refluxed to the absorber A on the lower stage can be kept low, so that the absorption heat can be removed more easily.

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

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

  In this case, on the inlet side of the air-cooling heat exchanger Ha in the reflux circuit 6, a junction 11 is provided to join all of the concentrated solution Lc from the generator G, and the air-cooling heat exchange in the reflux circuit 6. A branch circuit 12 for supplying a part of the supercooled solution to the upper part of the upper absorber A is attached to the outlet side of the vessel Ha. In this way, most of the dilute solution Ld from the lower absorber A passes through the heat exchanger 7 of the lower evaporator E and the heat exchanger 8 of the upper absorber A, and then the generator The refrigerant vapor Rs is generated in G and merged with all of the concentrated solution Lc, and is refluxed to the upper side of the upper and lower absorbers A, A while being supercooled by the air-cooling heat exchanger Ha. Accordingly, the temperature of the absorbing solution supplied to the upper absorber A is lowered, the amount of heat generated in the lower absorber A can be suppressed, and the temperature of the solution returned to the lower absorber A is reduced. Can be kept low, and the removal of absorbed heat becomes even easier.

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

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

  In this case, there are provided two generators G and G through which the heating medium Wh flows in series, and two air-cooled condensers C and C that condense the refrigerant vapor generated in the generators G and G, respectively. The upper-stage evaporator E is supplied with the refrigerant Rw that is generated by the high-temperature heating medium Wh located on the upstream side and condensed in one air-cooled condenser C, while the lower-stage evaporator E is supplied with A refrigerant generated by the heating medium Wh having a low temperature located on the downstream side and condensed by the other air-cooled condenser C is supplied. In this case, since the concentration of the solution to be concentrated on the heated side changes depending on the temperature level of the heating medium Wh, the heat held by the heating medium Wh can be used effectively, and the exhaust heat fluid is used as the heating medium. The exhaust heat recovery efficiency when using is improved.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted. It should be noted that this embodiment can also be applied to the absorption refrigeration apparatus according to the second to fourth embodiments.

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

  In this case, the units U and U are installed in parallel, and in the reflux circuit 6, most of the dilute solution Ld from the outlet of the absorber A constituting one unit U constitutes one unit U. The heat exchanger 7 of the evaporator E, the heat exchanger 8 in the absorber A constituting the other unit U, and the air cooled heat exchanger Ha are passed through to the upper part of the absorber A constituting the one unit U. Has been. In this way, the installation height of the units U and U can be suppressed.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted. It should be noted that this embodiment can also be applied to the absorption refrigeration apparatus according to the first to fifth embodiments.

  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.

1 is a system diagram showing an absorption refrigeration cycle in an absorption refrigeration apparatus according to a first embodiment of the present invention. 1 is a front view of an evaporator / absorber unit in an absorption refrigeration apparatus according to a first embodiment of the present invention. It is a systematic diagram which shows the absorption refrigeration cycle in the absorption refrigeration apparatus concerning 2nd Embodiment of this invention. It is a systematic diagram which shows the absorption refrigeration cycle in the absorption refrigeration apparatus concerning 3rd Embodiment of this invention. It is a systematic diagram which shows the absorption refrigerating cycle in the absorption refrigeration apparatus concerning 4th Embodiment of this invention. It is a systematic diagram which shows the absorption refrigeration cycle in the absorption refrigeration apparatus concerning 5th Embodiment of this invention. It is a systematic diagram which shows the absorption refrigeration cycle in the absorption refrigeration apparatus concerning the 6th Embodiment of this invention.

Explanation of symbols

6 is a reflux circuit 7 is a heat exchange unit 8 is a heat exchange unit 9 is a junction point 10 is a junction point 11 is a junction point 12 is a branch circuit G is a generator C is a condenser E is an evaporator A is an absorber Ha is air-cooled heat Exchanger Hw is solution heat exchanger U is unit Lc is concentrated solution Ld is dilute solution Rs is refrigerant vapor (water vapor)
Rw is liquid refrigerant (condensed water)
Wh is the heating medium (waste water)

Claims (7)

A generator (G), a condenser (C) that condenses and liquefies the refrigerant vapor (Rs) obtained from the generator (G), and evaporates and vaporizes the refrigerant (Rw) condensed and liquefied by the condenser (C). The evaporator (E) 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 absorption refrigeration apparatus provided with an absorber (A) for generating a diluted solution (Ld), wherein the evaporator (E) and the absorber (A) are horizontally aligned and integrated. Units (U) and (U) are arranged, and most of the dilute solution (Ld) from the outlet of the absorber (A) constituting one unit (U) constitutes one unit (U). Heat exchanger (7) of the evaporator (E) that performs the heat exchanger (A) in the absorber (A) that constitutes the other unit (U) ) And the air-cooled heat exchanger (Ha) menstrual by absorption refrigerating apparatus characterized by annexed reflux circuit that recirculates (6) at the top of the absorber (A) which constitutes one of the unit (U). The absorption refrigeration apparatus according to claim 1, wherein the units (U) and (U) are two-tiered in the vertical direction. The absorption refrigeration apparatus according to claim 1, wherein the units (U) and (U) are installed in parallel. A junction (9) for joining a part of the concentrated solution (Lc) from the generator (G) is provided on the outlet side of the air-cooled heat exchanger (Ha) in the reflux circuit (6). The absorption refrigeration apparatus according to any one of claims 1, 2, and 3, wherein A junction (10) for joining a part of the concentrated solution (Lc) from the generator (G) is provided on the inlet side of the air-cooled heat exchanger (Ha) in the reflux circuit (6). The absorption refrigeration apparatus according to any one of claims 1, 2, and 3, wherein On the inlet side of the air-cooled heat exchanger (Ha) in the reflux circuit (6), a junction (11) for joining all of the concentrated solution (Lc) from the generator (G) is provided, and the reflux On the outlet side of the air-cooled heat exchanger (Ha) in the circuit (6), a branch circuit (12 for supplying a part of the supercooled solution to the upper part of the absorber (A) constituting the other unit (U). The absorption refrigeration apparatus according to any one of claims 1, 2, and 3, wherein Two generators (G), (G) in which the heating medium (Wh) flows in series, and two air-cooled condensers that condense the refrigerant vapor (Rs) generated in each of the generators (G), (G), respectively. (C) and (C) are provided, and the refrigerant (Rw) generated in the other evaporator (E) by the heating medium (Wh) having a high temperature and condensed in one air-cooled condenser (C). ) Is supplied to the evaporator (E) on one side with the refrigerant (Rw) generated by the low temperature heating medium (Wh) and condensed in the other air-cooled condenser (C). The absorption refrigeration apparatus according to any one of claims 1, 2, 3, 4, 5, and 6, wherein the absorption refrigeration apparatus is configured.

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