JPH10339515A - Absorptive freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maximize the quantity of recovered heat as a whole, by recovering the quantity of heat that a high-temperature refrigerant steam possesses effectively to one part of the thick solution to be supplied to a heat exchanger for solution for heat recovery. SOLUTION: For this device, a gas-liquid heat exchanger 13 is laid, which recovers the heat that the high-temperature refrigerant steam g1 led from a generator 2 into the thick solution l2 which bypasses a heat exchanger 9 for solution for heat recovery besides being one part of a thick solution l2 being led from an absorber 8 to the generator 2. Then, this device is provided with flow control means 16 and 17 which control the flow of the thick solution l2 supplied to the heat exchanger 9 and the flow l2 supplied to the heat exchanger 13 so that the quantities of recovered heat in both may keep the maximum values, thus the quantity of heat that the high-temperature refrigerant steam g1 led out of the generator 2 can be recovered in one part of the thick solution from the absorber 8 to the generator 2, and also each flow of the thick solution supplied to the heat exchanger 9 and the heat exchanger 13 is controlled by the flow control means 16 and 17, so it becomes possible to keep the quantities of recovered heat in both at maximum values.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigeration system.

[0002]

2. Description of the Related Art For example, as shown in FIG. 5, an absorption refrigerating apparatus using an alternative refrigerant such as R407c having no chlorine atom as a refrigerant and using a refrigerating machine oil or the like as an absorbing liquid has a heating means (for example, a gas burner). is heated by 1), and generator 2 for generating a high-temperature refrigerant vapor g _1, a gas-liquid separator 3 for separating the absorbent solution contained in the generated high temperature refrigerant vapor g ₁ which by the generator 2, cooling operation a condenser 4 for condensing and liquefying the hot refrigerant vapor g ₁ derived from gas-liquid separator 3 at the time, a pressure reducing mechanism 5 for decompressing the refrigerant condensed and liquefied by the condenser 4, is depressurized by the pressure reducing mechanism 5 and an evaporator 6 which refrigerant evaporation vaporized to recover the heat of absorption generated when is taken up in dilute solution l ₁ led the cryogen vapor g ₂ which is vaporized by the evaporator 6 from the generator 2 absorption Heat exchanger 7 and the absorption heat And air-cooled absorber 8 to further absorb the refrigerant vapor into the solution derived from the exchanger 7, the absorption heat exchanger from the generator 2 to the concentrated solution l ₂ of course derived from the air-cooling the absorber 8 to the generator 2 heat-recovery solution heat exchanger 9 for recovering the middle of the heat possessed by the dilute solution l ₁ is guided to 7
It is comprised including. Reference numeral 10 denotes a pump for pumping the concentrated solution l ₂ , reference numeral 11 denotes a supercooler for supercooling the concentrated solution l ₂ to protect the pump 10, and reference numeral 12 denotes a pressure reducing dilute solution l ₁ from the generator 2. Is a pressure reducing mechanism.

[0003]

By the way, in the case of the absorption refrigeration system having the above structure, the heat of the high-temperature refrigerant vapor g ₁ supplied from the generator 2 to the condenser 4 during the cooling operation is retained in the condenser 4. It is supposed to be wastefully dissipated. Then, the solution heat exchanger 9 for heat recovery from the air-cooled absorber 8
Wherein be provided the heat-recovery gas-liquid heat exchanger for recovering heat held by the high-temperature refrigerant vapor g ₁ is considered a part of the concentrated solution l ₂ to be supplied to.

[0004] However, when configured as described above, it has become possible to distribute a part of the concentrated solution g ₂ to be supplied to the heat recovery solution heat exchanger 9 to heat-recovery gas-liquid heat exchanger Therefore, concentrated solution g supplied to the heat recovery solution heat exchanger 9 side
Becomes _{the second} flow is reduced, depending on the temperature relationship between the flow rate and dilute solution L _1, the coefficient of performance becomes the operating state which can not be completely recovered recoverable heat is generated (i.e., COP) is reduced The problem described above occurs.

The present invention has been made in view of the above points, and effectively recovers the amount of heat held by high-temperature refrigerant vapor in a part of a concentrated solution to be supplied to a heat recovery solution heat exchanger. The purpose is to make the total heat recovery amount the maximum value.

[0006]

According to the basic configuration of the present invention (the invention of claim 1), as a means for solving the above-mentioned problems, a generator which is heated by the heating means ₁ and generates a high-temperature refrigerant vapor g1 is provided. A condenser 4 for condensing and liquefying the high-temperature refrigerant vapor g ₁ generated by the generator 2;
A decompression mechanism 5 for decompressing the refrigerant condensed and liquefied by the evaporator, an evaporator 6 for evaporating and evaporating the refrigerant decompressed by the decompression mechanism 5, and a low-temperature refrigerant vapor g vaporized by the evaporator 6
The absorption heat exchanger 7 for recovering heat of absorption generated when absorbing a ₂ in dilute solution l ₁ derived from the generator 2, further refrigerant vapor g of concentrated solution l ₂ derived from said absorber heat exchanger 7 _Two
And a generator 2 that absorbs
A heat recovery solution heat exchanger 9 for recovering the heat possessed by the dilute solution l ₁ being guided from the generator 2 to the absorption heat exchanger 7 to the concentrated solution l ₂ being guided to In the refrigeration system, the heat held by the high-temperature refrigerant vapor g ₁ guided from the generator ₂ is part of the concentrated solution l ₂ guided to the generator 2 from the absorber 8, and A gas-liquid heat exchanger 13 for heat recovery for recovering the concentrated solution l ₂ bypassing the exchanger 9 is provided, and the flow rate of the concentrated solution l ₂ supplied to the solution heat exchanger 9 for heat recovery, heat recovery amount in both the flow rate of the concentrated solution l ₂ to be supplied to the recovery gas-liquid heat exchanger 13 is provided with a flow control means for controlling so as to maintain the maximum value.

[0007] By the structure described above, can be recovered in part the amount of heat held by the high-temperature refrigerant vapor g ₁ derived from the generator 2 from the absorber 8 of the concentrated solution l ₂ to be guided to the generator 2 it is possible to control the flow rate of the concentrated solution l ₂ to be supplied to the heat recovery solution heat exchanger 9, with concentrated solutions l ₂ flow rate and the flow rate control means which is supplied to the heat recovery gas-liquid heat exchanger 13 As a result, the heat recovery amount in both cases can be maintained at the maximum value.

As in the second aspect of the present invention, the flow rate control means is provided in the flow paths 14 and 15 to the heat recovery solution heat exchanger 9 and the heat recovery gas-liquid heat exchanger 13, respectively. Flow control valves 16 and 17;
When the control means 18 controls the degree of opening of the concentrated solution 17 to the heat recovery solution heat exchanger 9 and the heat recovery gas-liquid heat exchanger 13 by controlling the degree of opening of the flow control valves 16 and 17. The distribution ratio of ₂ can be controlled, and reliable control can be obtained. In this case, as in the invention of claim 3, the concentrated solution temperature detection means for detecting the temperature of the concentrated solution l ₂ at the inlet side of the heat recovery solution heat exchanger 9 19
If, while attaching a rare solution temperature detection means 20 for detecting the temperature of the dilute solution l ₁ at the outlet side of the heat recovery solution heat exchanger 9, the control unit 18, by the concentrated solution temperature detecting unit 19 The flow control valves 16 and 1 are so controlled that the detected concentrated solution inlet temperature is lower than the diluted solution outlet temperature detected by the diluted solution temperature detecting means 20 by a predetermined value.
Assuming that controls 7, prevents the temperature difference between the concentrated solution l ₂ in the heat-recovery solution heat exchanger 9 and a rare solution l ₁ is little or eliminated, or that the temperature difference is too attached,
Efficient heat recovery can be performed.

Further, as in the fourth aspect of the present invention, the flow rate control means is interposed in flow paths 14 and 15 to the heat recovery solution heat exchanger 9 and the heat recovery gas-liquid heat exchanger 13, respectively. At the time of rated operation.
When the fixed flow control mechanisms 22 and 23 having the fixed throttle values set so that the flow ratio of the concentrated solution in Step 5 is optimal, the optimum distribution ratio of the concentrated solution l ₂ for rated operation can be obtained. And complicated control is not required.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment (Corresponding to Claims 1 to 3) FIG. 1 shows a refrigerant circuit of an absorption refrigeration apparatus according to a first embodiment of the present invention.

This absorption refrigerating apparatus uses an alternative refrigerant such as R407c having no chlorine atom as a refrigerant and uses an organic solvent such as diethylene glycol dimethyl ether or a refrigerating machine oil as an absorbing liquid. similar to that, the heating means (e.g., gas burner 1) is heated by high-temperature refrigerant vapor g ₁ generator 2 for generating, absorbing liquid contained in the high-temperature refrigerant vapor g ₁ generated by the generator 2 -Liquid separator 3 for separating oil
A condenser 4 for condensing and liquefying the high-temperature refrigerant vapor g ₁ guided from the gas-liquid separator 3 during the cooling operation;
A decompression mechanism 5 for decompressing the refrigerant condensed and liquefied by the evaporator, an evaporator 6 for evaporating and evaporating the refrigerant decompressed by the decompression mechanism 5, and a low-temperature refrigerant vapor g ₂ evaporated and vaporized by the evaporator.
The absorption heat exchanger 7 for recovering heat of absorption generated when is taken up in dilute solution l ₁ derived from the generator 2, cooling absorption to absorb more refrigerant vapor into the solution derived from said absorber heat exchanger 7 From the air-cooled absorber 8 to the generator 2
And a heat recovery solution heat exchanger 9 for recovering the heat possessed by the dilute solution l ₁ on the way from the generator 2 to the absorption heat exchanger 7 on the concentrated solution l ₂ on the way. Have been. Reference numeral 10 denotes a pump for pumping the concentrated solution l ₂ , reference numeral 11 denotes a supercooler for supercooling the concentrated solution l ₂ to protect the pump 10, and reference numeral 12 denotes a pressure reducing dilute solution l ₁ from the generator 2. Is a pressure reducing mechanism.

In this absorption refrigerating apparatus, the pressure reducing mechanism 5 and the evaporator 6 constitute an indoor unit X, and other various devices constitute an outdoor unit Y. In this embodiment, one indoor unit X is connected to one outdoor unit Y.
, A plurality of (for example, four) indoor units X, X,... May be connected to one outdoor unit Y.

In this absorption refrigeration system, the heat of the high-temperature refrigerant vapor g ₁ introduced from the generator 2 is transferred to a part of the concentrated solution l ₂ introduced from the absorber 8 to the generator 2. heat-recovery gas-liquid heat exchanger 13 for recovering the concentrated solution l ₂ to bypass the heat recovery solution heat exchanger 9 is attached to a at.

The flow paths 14 and 15 leading to the solution heat exchanger 9 for heat recovery and the gas-liquid heat exchanger 13 for heat recovery include:
Flow control valves 16 and 17 are provided respectively.

Furthermore, a first temperature sensor 19 which acts as a concentrated solution temperature detection means for detecting the temperature of the concentrated solution l ₂ at the inlet side of the heat recovery solution heat exchanger 9, the heat recovery solution heat exchanger 9 A second temperature sensor 20 which functions as a dilute solution temperature detecting means for detecting the temperature of the dilute solution l ₁ at the outlet side, and the temperature of the high-temperature refrigerant vapor g ₁ at the outlet side of the heat recovery gas-liquid heat exchanger 13. A third temperature sensor 21 serving as a steam temperature detecting means for detecting is provided.

The detected data detected by the first to third temperature sensors 19 to 21 is input to a controller 18 acting as a control means, and the controller 18 executes various calculations based on the detected data. The results of the various calculations are output as control signals to control the opening of the flow control valves 16 and 17. In other words, the flow control valves 16, 17 and the controller 18 constitute a flow control means in the claims.

The absorption refrigeration system configured as described above operates as follows.

From the generator 2 heated by the gas burner ₁ , a mixture of the high-temperature refrigerant vapor g ₁ and an absorbent having a low refrigerant concentration (ie, a high-temperature dilute solution l ₁ ) is generated. It is separated into a dilute solution l ₁ of the steam g ₁ and the high temperature. The thus obtained high-temperature refrigerant vapor g ₁ is supplied to the condenser 4 by external cooling substance (e.g., air or water) will be condensed and liquefied is cooled by, in the heat-recovery gas-liquid heat exchanger 13 before it some of the concentrated solution l ₂ derived from air-cooled absorber 8 and heat exchanger, which contributes to the temperature rise of the concentrated solution l ₂ (i.e., the amount of heat held by the high-temperature refrigerant vapor g ₁ is the heat recovery in the concentrated solution l ₂ ).

On the other hand, the dilute solution l ₁ separated in the gas-liquid separator 3 is supplied to the absorption heat exchanger 7 via the heat recovery solution heat exchanger 9 and the low-temperature refrigerant vapor g supplied from the evaporator 6. Absorb ₂

[0021] are condensed in the condenser 4 as described above refrigerant, the low temperature refrigerant vapor g ₂ next is vaporized in the evaporator 6 after being decompressed by the decompression mechanism 5 by exchanging heat with indoor air, the aforementioned Is supplied to the absorption heat exchanger 7. Here, in the evaporator 6, the room air is cooled and provided for cooling.

By the way, in the absorption heat exchanger 7, is absorbed in the dilute solution l ₁ to the evaporator 6 cryogen vapor g ₂ supplied from the supplied from the generator 2 through the heat-recovery solution heat exchanger 9 You.

[0023] Incidentally, only the absorption heat exchanger 7 because the absorption of the dilute solution l ₁ of the low-temperature refrigerant vapor g ₂ is insufficient, the feed refrigerant vapor and absorption solution leaving the absorber heat exchanger 7 to the air-cooled absorber 8 , so as to obtain the concentrated solution l ₂ further performs the absorption of the refrigerant vapor.

[0024] After being completely liquefied by concentrated solution l ₂ are subcooler 11 exiting the air-cooled absorber 8, is sent to the absorption heat exchanger 7 by the pump 10, the heat of absorption is recovered as described above, further In the heat recovery solution heat exchanger 9 and the heat recovery gas-liquid heat exchanger 13, the heat is recovered from the high-temperature dilute solution l ₁ and the refrigerant vapor g _1, and then returned to the generator 2.

In the present embodiment, as described above, a part of the concentrated solution g ₂ to be supplied to the heat recovery solution heat exchanger 9 is distributed to the heat recovery gas-liquid heat exchanger. and it turned in order that, it is the flow rate of the concentrated solution g ₂ to be supplied to the heat recovery solution heat exchanger 9 side is reduced, depending on the temperature relationship between the flow rate and dilute solution L _1, the recoverable heat Since the operation state that cannot be completely recovered occurs and the coefficient of performance (that is, COP) decreases, the first to third temperature sensors 19 to 2 are removed.
An opening control signal is output from the controller 18 to the flow control valves 16 and 17 based on the detection data from 1 and
The heat recovery amount is controlled to maintain the maximum value.

For example, the concentrated solution inlet temperature detected by the first temperature sensor 19 becomes lower than the diluted solution outlet temperature detected by the second temperature sensor 20 by a predetermined value, and the outlet vapor detected by the third temperature sensor 21 The flow control valves 16 and 17 are controlled so as to be lower than the temperature by a predetermined value. Then, as shown in FIG. 3, the flow ratio Q ₁ / Q ₀ of the flow rate of the concentrated solution l ₂ distributed to the heat recovery solution heat exchanger 9 to the flow rate of the concentrated solution l ₂ guided from the air-cooled absorber 8.
Is between 0.25 and 0.75, the heat recovery amount maintains the maximum value. Therefore, the coefficient of performance (that is, COP) of the refrigeration system is improved.

Second Embodiment (Corresponding to Claims 1 and 4) FIG. 4 shows a refrigerant circuit of an absorption refrigeration apparatus according to a second embodiment of the present invention.

In this case, flow control means are provided in flow paths 14 and 15 to the heat recovery solution heat exchanger 9 and the heat recovery gas-liquid heat exchanger 13, respectively. , a fixed flow rate control mechanism having a concentrated solution l fixed aperture flow rate ratio of ₂ is set to be optimum in 15 (e.g., a capillary tube 22, 23) is used. In this way, it becomes possible distribution ratio optimum concentrated solution l ₂ in the rated operation is achieved, complicated control is unnecessary. The other configuration and operation and effect are the same as those in the first embodiment, and the description is omitted.

In a CFC-based or ammonia-based absorption refrigeration system, a concentrated solution represents a solution containing a large amount of chlorofluorocarbon or ammonia, and a dilute solution represents a solution containing a small amount of chlorofluorocarbon or ammonia. In the case of the apparatus, a concentrated solution contains a large amount of LiBr, and a dilute solution contains LBr.
Express a solution with low iBr.

[0030]

According to the invention of the present application (the invention of claim 1),
Is heated by the heating means 1, a generator 2 for generating a high-temperature refrigerant vapor g _1, a condenser 4 for condensing and liquefying the hot refrigerant vapor g ₁ generated by the generator 2, is condensed and liquefied by the condenser 4 A decompression mechanism 5 for decompressing the refrigerant, an evaporator 6 for evaporating the refrigerant decompressed by the decompression mechanism 5,
The absorption heat exchanger 7 for recovering heat of absorption generated when absorbing a low-temperature refrigerant vapor g ₂ which is vaporized in a dilute solution l ₁ derived from the generator 2 by the evaporator 6, the absorption heat exchanger the absorber 8 to be concentrated in the solution l ₂ further absorbs refrigerant vapor g ₂ derived from 7, the absorption heat exchanger from the generator 2 from the absorber 8 to the concentrated solution l ₂ of the course to be guided to the generator 2 A heat recovery solution heat exchanger 9 for recovering the heat of the dilute solution l ₁ on the way to the heat generator 7.
Heat recovery to recover ₁ held by heat to the concentrated solution l ₂ to bypass the absorber 8 the heat recovery solution heat exchanger 9 a portion of the concentrated solution l ₂ to be guided to the generator 2 from while attaching a gas-liquid heat exchanger 13, and concentrated solution l ₂ flow rate supplied to the heat recovery solution heat exchanger 9, the concentrated solution l ₂ to be supplied to the heat recovery gas-liquid heat exchanger 13 The flow rate control means for controlling the flow rate of the high-temperature refrigerant vapor g ₁ guided from the generator 2 to the generator 8 it is possible to recover a portion of the concentrated solution l ₂ is guided to 2, and the flow of concentrated solution l ₂ to be supplied to the heat recovery solution heat exchanger 9, to the heat recovery gas-liquid heat exchanger 13 will be a concentrated solution l ₂ flow rate to be supplied is controlled by the flow control means, in both Kicking will be the heat recovery amount can be maintained at the maximum value, coefficient of performance as the refrigeration system (i.e., COP) an excellent effect that it is possible to improve.

As in the second aspect of the present invention, the flow rate control means is provided in the flow paths 14 and 15 to the heat recovery solution heat exchanger 9 and the heat recovery gas-liquid heat exchanger 13, respectively. Flow control valves 16 and 17;
When the control means 18 controls the degree of opening of the concentrated solution 17 to the heat recovery solution heat exchanger 9 and the heat recovery gas-liquid heat exchanger 13 by controlling the degree of opening of the flow control valves 16 and 17. The distribution ratio of ₂ can be controlled, and reliable control can be obtained. In this case, as in the invention of claim 3, the concentrated solution temperature detection means for detecting the temperature of the concentrated solution l ₂ at the inlet side of the heat recovery solution heat exchanger 9 19
If, while attaching a rare solution temperature detection means 20 for detecting the temperature of the dilute solution l ₁ at the outlet side of the heat recovery solution heat exchanger 9, the control unit 18, by the concentrated solution temperature detecting unit 19 The flow control valves 16 and 1 are so controlled that the detected concentrated solution inlet temperature is lower than the diluted solution outlet temperature detected by the diluted solution temperature detecting means 20 by a predetermined value.
Assuming that controls 7, prevents the temperature difference between the concentrated solution l ₂ in the heat-recovery solution heat exchanger 9 and a rare solution l ₁ is little or eliminated, or that the temperature difference is too attached,
Efficient heat recovery can be performed.

Further, as in the fourth aspect of the present invention, the flow rate control means is provided in the flow paths 14 and 15 to the heat recovery solution heat exchanger 9 and the heat recovery gas-liquid heat exchanger 13, respectively. At the time of rated operation.
When the fixed flow control mechanisms 22 and 23 having the fixed throttle values set so that the flow ratio of the concentrated solution in Step 5 is optimal, the optimum distribution ratio of the concentrated solution l ₂ for rated operation can be obtained. And complicated control is not required.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of an absorption refrigeration apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing another example (multi-type) of the absorption refrigeration apparatus according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a concentrated solution flow control state in the absorption refrigeration apparatus according to the first embodiment of the present invention.

FIG. 4 is a refrigerant circuit diagram of an absorption refrigeration apparatus according to a second embodiment of the present invention.

FIG. 5 is a refrigerant circuit diagram of a conventional absorption refrigeration apparatus.

[Explanation of symbols]

1 is a heating means (gas burner), 2 is a generator, 4 is a condenser, 5 is a decompression mechanism, 6 is an evaporator, 7 is an absorption heat exchanger, 8
Is an absorber (air-cooled absorber), 9 is a solution heat exchanger for heat recovery,
13 is a gas-liquid heat exchanger for heat recovery, 14 and 15 are flow paths, 1
6, 17 are flow rate control valves, 18 is control means (controller), 19 is concentrated solution temperature detection means (first temperature sensor), 20 is dilute solution temperature detection means (second temperature sensor), 21 is refrigerant vapor temperature detection means (third temperature sensors), the fixed flow rate control mechanism (capillary tube) 22, 23, g ₁ is the high-temperature refrigerant vapor, g ₂ is the low-temperature refrigerant vapor, l
₁ is a dilute solution, ₁₂ is a concentrated solution.

Claims (4)

[Claims] 1. A is heated by a heating means (1), condensing the hot refrigerant vapor (g ₁₎ generator for generating (2), the generator generated by the (2) high temperature refrigerant vapor (g ₁₎ A condenser (4) for liquefaction, a decompression mechanism (5) for decompressing the refrigerant condensed and liquefied by the condenser (4), and an evaporator (6) for evaporating the refrigerant decompressed by the decompression mechanism (5). ) And an absorption for recovering the heat of absorption generated when the low-temperature refrigerant vapor (g ₂ ) vaporized and vaporized by the evaporator (6) is absorbed by the dilute solution (l ₁ ) led from the generator (2). A heat exchanger (7), an absorber (8) for further absorbing the refrigerant vapor (g ₂ ) into the solution led from the absorption heat exchanger (7), and the generator (2) from the absorber (8). To the concentrated solution (l ₂ ) on the way to the absorption heat exchanger (7). A heat recovery solution heat exchanger (9) for recovering the heat of the dilute solution (l ₁ ) on the way, comprising: a high-temperature refrigerant vapor ( The concentrated solution (l ₂ ) in which the heat retained by g ₁ ) is led from the absorber (8) to the generator ( ₂ ).
A heat-recovery gas-liquid heat exchanger (13) for recovering a concentrated solution (l ₂ ) that is a part of the heat-recovery solution heat exchanger (9), The flow rate of the concentrated solution (l ₂ ) supplied to the heat exchanger (9) and the concentrated solution (l ₂ ) supplied to the heat recovery gas-liquid heat exchanger (13)
₂ ) An absorption refrigeration system characterized by comprising flow rate control means for controlling the flow rate of ( ₂ ) such that the heat recovery amount in both of them is maintained at a maximum value. 2. The flow control means is interposed in flow paths (14) and (15) to the heat recovery solution heat exchanger (9) and the heat recovery gas-liquid heat exchanger (13), respectively. Flow control valves (16), (17), and the flow control valves (16),
2. The absorption refrigeration apparatus according to claim 1, wherein said absorption refrigeration apparatus is constituted by control means (18) for controlling the opening degree of (17). 3. A concentrated solution temperature detecting means (19) for detecting the temperature of the concentrated solution (l ₂ ) at the inlet side of the heat recovery solution heat exchanger (9), and the heat recovery solution heat exchanger (9). 9)
A dilute solution temperature detecting means (20) for detecting the temperature of the dilute solution (l ₁ ) at the outlet side of the apparatus, and the control means (18) is detected by the concentrated solution temperature detecting means (19). The flow control valves (16) and (17) so that the concentrated solution inlet temperature is lower by a predetermined value than the diluted solution outlet temperature detected by the diluted solution temperature detecting means (20).
3. The absorption refrigeration apparatus according to claim 2, wherein the temperature is controlled. 4. The heat recovery solution heat exchanger (9) and the heat recovery gas-liquid heat exchanger (1) as the flow control means.
The concentrated solution (l ₂ ) is interposed in each of the flow paths (14) and (15) leading to 3), and at the time of rated operation.
2. The absorption refrigeration system according to claim 1, wherein fixed flow control mechanisms (22) and (23) each having a fixed throttle value set so that the flow ratio of the refrigeration is optimized are used.