KR20080041553A - Absorption type refrigerator - Google Patents

Abstract

An absorption-type refrigerator is provided to prevent cool and hot water from cooling excessively by the operation of a cool and hot water pump. An absorption-type refrigerator comprises a high-temperature generator(1), a low-temperature generator(2), a condenser(3), an evaporator(4), an absorber(5), a high-temperature heat exchanger(6), and a low-temperature heat exchanger(7) which are connected by means of a pipe. A coolant pipe(11) passes through the condenser after passing through the absorber. A cool and hot water pipe(14) passes through the evaporator. A refrigerant pump(13) supplies refrigerant liquid to a refrigerant distribution pipe(4a). Additionally, a coolant pump(12) is installed to supply a refrigerant to the coolant pipe.

Description

Absorption Chillers {ABSORPTION TYPE REFRIGERATOR}

1 is a configuration diagram showing a first embodiment of an absorption type refrigerator according to the present invention.

2 is a flowchart of the first embodiment of the absorption refrigerator according to the present invention;

3 is a block diagram showing a second embodiment of the absorption type refrigerator according to the present invention;

4 is a flowchart of a second embodiment of an absorption refrigerator according to the present invention;

Fig. 5 is a configuration diagram showing a third embodiment of the absorption refrigerator according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: high temperature regenerator

2: low temperature regenerator

3: condenser

4: evaporator

5: absorber

6: high temperature heat exchanger

7: low temperature heat exchanger

8: rare water pump

9: burner

10: concentrated absorption liquid pump

11: coolant pipe

12: coolant pump

13: refrigerant liquid pump

14: cold and hot water pipeline

15: cold and hot water pump

16, 17, 18: on-off valve

19: refrigerant liquid bypass pipe

20: on-off valve

21: coolant bypass pipeline

22: on-off valve

[Document 1] Japanese Unexamined Patent Publication No. 2001-99474

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption chiller and, more particularly, to an absorption chiller in which cold hot water on the load side is not frozen inside the evaporator during operation stop.

In general, a dual-effect absorption chiller is a hot regenerator, a low temperature regenerator, a condenser, an evaporator, an absorber and a high temperature heat exchanger, a low temperature heat exchanger connected by a conduit, and at the same time, a concentrated absorbent pump, a rare absorbent pump, a refrigerant liquid pump and By providing an on-off valve and the like, a circulation pipe of the absorbent liquid system and a refrigerant pipe of the refrigerant system are configured. Then, cooling or freezing action is obtained by cooling the hot and cold water returned from the load side by the heat of evaporation of the refrigerant liquid in the evaporator and supplying it to the load side. Moreover, not only cooling but also heating can be performed by switching a pipe. A lithium bromide aqueous solution is normally used as an absorption liquid, and water is used as a refrigerant.

In the dual-effect absorption chiller, a cooling water pipe is formed which passes through the inside of the absorber and then passes through the inside of the condenser. The cooling water is circulated through the cooling water pipe to cool the concentrated absorbent liquid scattered from the concentrated absorbent liquid dispersion pipe inside the absorber. Therefore, the absorption function of absorbing the refrigerant vapor introduced into the absorber from the evaporator is enhanced, and the condenser function is cooled in the condenser to cool the refrigerant vapor flowing into the condenser from the low temperature regenerator and condense it into the refrigerant liquid.

The dual-effect absorption chiller is used, for example, in an air conditioner of an office building or a refrigerator for commercial use. However, since the cooling tower (cooling tower) is installed outdoors, the cooling water freezes in the cooling water pipe due to a decrease in temperature during operation stop. There is a thing. If freezing of the cooling water occurs, the circulation of the cooling water may deteriorate or become impossible when the operation is resumed thereafter, resulting in deterioration of performance, and there may be a situation such as cracking or rupture of the cooling water pipe.

In order to prevent such a situation, the air conditioning apparatus comprised so that cooling operation using an absorption type refrigerator is possible, WHEREIN: The technique which prevents a cooling water from freezing in a cooling water pipe even if temperature falls during the stop of the said air conditioning apparatus, for example, a patent document 1 is disclosed. In this case, when there is a danger of freezing due to a decrease in the temperature of the cooling water in the cooling water pipe which is easily affected by the outside air and tends to decrease in temperature, the cooling water pump is started and the heat capacity is relatively large and is affected by the outside air. The cooling water in the difficult cooling tower reservoir is supplied to the cooling water pipe to prevent freezing of the cooling water in the cooling water pipe.

However, according to the above prior art, the invention relates to the prevention of freezing of the cooling water for cooling the absorber and the condenser in the absorption chiller, and not to the prevention of freezing of cold and hot water circulating between the load side and the evaporator. As for the prevention of freezing of the cold and hot water, no conventional means has been employed, and only attention is paid to the user. It is difficult to reliably prevent freezing of cold and hot water only by drawing attention.

An object of the present invention is to make it possible to reliably prevent freezing of cold and hot water when the cooling water pump is started alone, especially in a dual-effect absorption chiller.

As a means for achieving the above object, the invention of claim 1 is a condenser after the high temperature regenerator, the low temperature regenerator, the condenser, the evaporator, the absorber and the high temperature heat exchanger, and the low temperature heat exchanger are connected by a conduit and passed through the inside of the absorber. A cooling water pipe passing through the inside of the evaporator is formed, a cold and hot water pipe on the load side passing through the inside of the evaporator is formed, and a concentrated water absorption pump for supplying the concentrated absorbing liquid from the low temperature regenerator to the absorber, A rare water liquid pump for supplying a rare water liquid, a refrigerant liquid pump for supplying a refrigerant liquid stored at the bottom of the evaporator to a refrigerant liquid dispersion pipe formed at an upper portion of the evaporator, and supplying cooling water to the cooling water pipe In the absorption chiller provided with a cooling water pump, when the cooling water pump is started alone at the time of operation stop, Characterized by driving the peristaltic pump installed in the hot and cold water pipe.

The invention of claim 2 is characterized in that a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, an absorber and a high temperature heat exchanger, a low temperature heat exchanger are connected by a conduit, and at the same time a coolant pipeline is passed through the inside of the condenser after passing through the inside of the absorber. The cold and hot water pipe on the load side passing through the inside of the evaporator is formed, a concentrated absorbent pump for supplying the concentrated absorbent liquid from the low temperature regenerator to the absorber, a rare absorbent pump for supplying the rare absorbent liquid from the absorber to the high temperature regenerator, and a bottom portion of the evaporator. An absorption chiller provided with a refrigerant liquid pump for supplying the stored refrigerant liquid to a refrigerant liquid distribution pipe formed on the upper part of the evaporator, and a cooling water pump for supplying cooling water to the cooling water pipe, wherein the refrigerant liquid pump is provided at the bottom of the evaporator. A refrigerant in a pipe for supplying the refrigerant liquid stored in the liquid to the refrigerant liquid dispersion pipe formed on the evaporator In the case where a coolant liquid bypass pipe is connected to the downstream side of the pump and the bottom of the absorber, and an on-off valve is provided in the coolant liquid bypass pipe, and the coolant pump is started alone when the operation stops. The on / off valve is opened to supply a part of the refrigerant liquid in the evaporator to the absorber through the refrigerant liquid bypass pipe by the refrigerant liquid pump.

The invention of claim 3 is characterized in that a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, an absorber and a high temperature heat exchanger, a low temperature heat exchanger are connected by a conduit, and at the same time a coolant pipeline is passed through the inside of the condenser after passing through the inside of the absorber. The cold and hot water pipe on the load side passing through the inside of the evaporator is formed, and the concentrated absorbent pump for supplying the concentrated absorbent liquid from the low temperature regenerator to the absorber, the rare absorbent pump for supplying the rare absorbent liquid from the absorber to the hot regenerator, An absorption chiller provided with a refrigerant liquid pump for supplying the stored refrigerant liquid to a refrigerant liquid distribution pipe formed on the evaporator, and a cooling water pump for supplying cooling water to the cooling water pipe, the absorption chiller comprising: an upstream side from an absorber of the cooling water pipe; While forming a cooling water bypass pipe connecting downstream from the absorber, the cooling Installing an on-off valve in the bypass line, and at the time of operation stop, that when the cooling water pump is solely started up, characterized in that for opening the passage of a portion of the cooling water in the cooling water by-pass conduit to open and close the valve.

EMBODIMENT OF THE INVENTION Next, embodiment of the absorption type refrigerator which concerns on this invention is described, referring an accompanying drawing. 1 is a configuration diagram showing a first embodiment of an absorption type refrigerator according to the present invention, and includes a high temperature regenerator 1, a low temperature regenerator 2, a condenser 3, an evaporator 4, an absorber 5, and a high temperature heat exchanger. (6) and the low temperature heat exchanger 7 and the like are connected by a pipe line, and the circulation path of the absorbing liquid system and the refrigerant system are constituted.

[First Embodiment]

In the high temperature regenerator 1, the rare absorbent liquid returned from the absorber 5 through the pipe line R1 by the rare absorbent liquid pump 8 is accommodated, and this rare absorbent liquid is heated by the burner 9 and is a rare absorbent liquid. The refrigerant liquid in the water becomes a vapor and is separated by evaporation. As a result, the rare water absorbing liquid becomes a heavy absorbent liquid and is supplied to the low temperature regenerator 2 through the pipe line R2, but the rare water flowing through the pipe line R1 when passing through the high temperature heat exchanger 6 on the way. The heat is radiated by heat exchange with the absorbent liquid, and is accommodated in the low temperature regenerator 2. On the other hand, the refrigerant vapor evaporated is supplied to the condenser 3 through the conduit R3, but when heat passes through the low temperature regenerator 2, heat is released by heat exchange with the heavy absorbent liquid contained in the low temperature regenerator 2. To form a gas-liquid mixed liquid, and to condense to form a refrigerant liquid, which is accommodated in the bottom of the condenser 3.

In the low temperature regenerator 2, the heavy absorbent liquid supplied from the high temperature regenerator 1 is heated by the refrigerant vapor passing through the low temperature regenerator 2, and the refrigerant liquid in the heavy absorbent liquid becomes vapor and is separated by evaporation. . As a result, the heavy absorbent liquid becomes a concentrated absorbent liquid and is supplied to the absorber 5 through the conduit R4 by the concentrated absorbent liquid pump 10, but the high temperature regenerator 1 when passing through the low temperature heat exchanger 7 on the way. The heat dissipation is performed by heat exchange between the rare absorbing liquid flowing through the pipe line R1 toward the C) and supplied to the absorbent liquid dispersion pipe 5a of the absorber 5. On the other hand, the refrigerant vapor evaporated in the low temperature regenerator 2 flows into the condenser 3 side beyond the upper part of the partition wall.

In the condenser 3, the refrigerant vapor introduced from the low temperature regenerator 2 is cooled and condensed by the cooling water passing through the condenser 3 to form a refrigerant liquid and accumulates at the bottom of the condenser 3. . The coolant passes through the condenser 3 after the coolant pump 12 has passed through the coolant pipe 11 through the absorber 5.

In the evaporator 4, the refrigerant liquid accumulated at the bottom of the condenser 3 is supplied through the conduit R5, and the refrigerant liquid spreading pipe 4a through the conduit R6 by the refrigerant liquid pump 13. Supplied to. The refrigerant liquid dispersed from the refrigerant liquid dispersion pipe 4a is absorbed by heat exchange between the hot and cold water flowing through the evaporator 4 through the cold / hot water pipe 14 by the cold / hot water pump 14 to evaporate. do. The hot and cold water flowing through the cold / hot water pipe 14 by this evaporation heat is cooled, and is supplied from the evaporator 4 to the load (not shown) side of a refrigerator or the like. From the load side, cold and hot water whose temperature rises is returned to the evaporator 4 and circulated. On the other hand, the refrigerant vapor evaporated in the evaporator 4 flows into the absorber 5 side through the compartment slit part.

In the absorber 5, the concentrated absorbent liquid dispersed from the absorbent liquid dispersion pipe 5a is cooled by the cooling water flowing through the cooling water pipe 11, and the refrigerant vapor is absorbed by the cooled concentrated absorbent liquid. High concentrations of concentrated absorbent liquid and low liquid temperature improve the ability to absorb refrigerant vapor. The concentrated absorbent liquid absorbing the refrigerant vapor becomes a rare absorbent liquid and accumulates at the bottom of the absorber 5. The rare absorbent liquid accumulated at the bottom of the absorber 5 is returned to the high temperature regenerator 1 through the pipeline R1 by the rare absorbent liquid pump 8, but when passing through the low temperature heat exchanger 7 on the way, The low temperature from the high temperature regenerator 1 when it heats by heat exchanged with the medium temperature concentrated absorption liquid which flows from the low temperature regenerator 2 toward the absorber 5, and subsequently passes through the high temperature heat exchanger 6, After reheating by exchanging heat with the hot concentrated absorbent liquid flowing toward the regenerator 2, the high temperature regenerator 1 is returned.

This circulates to the high temperature regenerator 1 → [pipe line R2] → low temperature regenerator 2 → [pipe line R4] → absorber 5 → [pipe line R1] → high temperature regenerator 1 The circulation path of the absorbent liquid system and the high temperature regenerator (1) → [pipe (R3)] → condenser (3) → [pipe (R5)] → evaporator (4) → [pipe (R6)] → evaporator (4) → absorber (5) → [pipe (R1)] → A refrigerant system circulation path circulating to the high temperature regenerator 1 is configured.

Moreover, the opening / closing valve 16 provided in the conduit R7 branched from the said conduit R3 and connected to the absorber 5, and the opening / closing provided in the conduit R8 branched from the conduit R2 and connected to the absorber 5 Absorber without opening the valve 17 and the shut-off valve 18 provided in the conduit R9 branched from the conduit R6 and connected to the bottom of the absorber 5 without starting the coolant pump 12. Without supplying the cooling water to the condenser 3 and the condenser 3, the burner 9 is ignited to heat the rare absorbent liquid in the high temperature regenerator 1, and the refrigerant vapor generated in the high temperature regenerator 1 is connected to a conduit line ( From the middle of R3), the flow path resistance is supplied to the absorber 5 via a small conduit R7. Then, the refrigerant vapor supplied to the absorber (5) flows into the evaporator (4) side, heat exchanges with the cold and hot water passing through the inside of the evaporator (4) through the cold and hot water pipe (14), and condensed by the heat of condensation at this time Heat it. By supplying this heated cold / hot water to a load side, it can operate in a heating mode. In the cooling or freezing mode operation, the on / off valves 16, 17, and 18 are all closed. In addition, it is preferable that all the opening / closing valves 16, 17, and 18 are electromagnetic valves so that they can be controlled by a control apparatus (not shown).

In the heating mode operation, the refrigerant liquid condensed in the evaporator 4 accumulates at the bottom of the evaporator 4 and the passage R9 has a small flow resistance in the course of flowing the pipeline R6 by the refrigerant liquid pump 13. Is supplied to the absorber (5). The heavy absorbent liquid generated in the high temperature regenerator 1 is supplied to the absorber 5 from the middle of the pipeline R2 through the pipeline R8 having a small flow resistance, and the pipeline R9 is provided in the absorber 5. It is mixed with the refrigerant liquid supplied through), and becomes a rare absorbent liquid, and is returned to the high temperature regenerator 1 through the conduit R1 by the rare absorbent liquid pump 8.

In this embodiment, it is a case where cooling or freezing mode operation | movement is performed, and cold hot water is prevented from being frozen inside the evaporator 4 during operation stop by the fall of the external air temperature in winter time. Even if operation of the absorption chiller is stopped, the cooling water pump 12 preferably continues the operation to circulate the cooling water in a cooling tower (not shown). Cooling towers are usually installed outdoors, and are often installed on rooftops, especially in office buildings and the like. For this reason, it is easy to be influenced by outside temperature, and when circulation of a cooling water is stopped with the stop of an absorption type refrigerator, freezing of cooling water becomes easy to occur in a cooling water pipe. In order to avoid this, it is preferable to circulate the cooling water by operating the cooling water pump 12 even during operation stop of the absorption chiller.

In the present embodiment, when the cooling water pump 12 is started alone when the absorption chiller stops operating, the cold / hot water pump 15 provided in the cold / hot water pipe 14 on the load side is characterized by interlocking operation. After operation of the absorption chiller, the cooling water pump 12 is operated to circulate the cooling water in the cooling tower, thereby cooling the absorber 5 when the cooling water passes through the inside of the absorber 5 through the cooling water pipe 11. .

When the inside of the absorber 5 is cooled by the cooling water, the inside of the evaporator 4 which is integrated with the absorber 5 is cooled and excessively cooled when the hot and cold water stays in the evaporator 4 through the cold / hot water pipe 14. This results in freezing of the cooling water. This freezing of the hot and cold water may affect the wide area of the cold / hot water pipe 14 without stopping at the region portion in the evaporator 4, and the flow is inhibited when the absorption chiller is restarted, thereby degrading the function as the heat medium. In this embodiment, such a situation is avoided.

2 shows a flowchart in the present embodiment. When the operation signal is turned off in step S1, the operation of the absorption chiller is stopped. If the operation signal is on, the operation of the absorption chiller is continued.

When the operation signal of the absorption chiller is turned off, a cooling water pump interlock signal is generated in step S2. When the signal is on, the cooling water pump 12 starts alone, and the starting signal of the cold / hot water pump 15 on the load side is generated. It turns on and starts interlocking operation. And while the cooling water pump interlock signal is on, the cold / hot water pump 15 continues the interlock operation. When the cooling water pump interlock signal is turned off, the cooling water pump 12 starts and stops, and at the same time, the start signal of the cold / hot water pump 15 is turned off and stops.

In the present embodiment, when the cooling water pump 12 is started alone when the absorption chiller stops operating, the cold / hot water pump 15 is operated in conjunction with the cooling water pump 12, so that the cold and hot water of the cold / hot water pipe 14 is operated. Can be cycled. For this reason, cold hot water does not stay inside the evaporator 4 via the cold / hot water pipe 14, and excessive cooling of cold / hot water by the influence of cooling water can be avoided. Thereby, freezing of cold / hot water during a driving stop can be prevented.

Second Embodiment

3 is a configuration diagram showing a second embodiment according to the present invention. In this embodiment, the structural member similar to the said 1st Embodiment attaches | subjects the same code | symbol as the above, and detailed description is abbreviate | omitted. In this embodiment, the pipe line R6 for supplying the coolant liquid stored in the bottom of the evaporator 4 by the coolant liquid pump 13 to the coolant liquid spreading pipe 4a formed on the upper part of the evaporator 4. ) Forms a refrigerant liquid bypass conduit (19) connecting downstream from the refrigerant liquid pump (13) and the bottom of the absorber (5), and opens / closes the valve (20) in the refrigerant liquid bypass conduit (19). It is characterized by the configuration that installed). In the illustrated example, the refrigerant liquid bypass pipe 19 is a bypass pipe that connects the upstream side and the downstream side of the on-off valve 18 in the pipe line R9 using the pipe line R9. Formed. In addition, it is preferable to use an electromagnetic valve or an automatic flow valve as the on-off valve 20.

In the present embodiment, when the cooling water pump 12 is started alone when the absorption chiller stops operating, the on / off valve 20 is opened to partially cool the liquid in the evaporator 4 to the refrigerant liquid pump ( 13 to the absorber 5 through the refrigerant liquid bypass pipe 19. At this time, the opening / closing valve 18 of the conduit R9 is closed.

The coolant liquid stays at the bottom of the evaporator 4, and after the operation stops, self-evaporation is generated from the coolant liquid in the evaporator 4 which is approximately vacuum. The vaporized refrigerant vapor flows into the absorber 5 side and is absorbed by the rare absorbent liquid remaining in the bottom of the absorber 5, but is evaporated through the cold / hot water pipe 14 by the heat of evaporation upon self evaporation. The cold and hot water remaining in the chamber is cooled. When cold / hot water is excessively cooled, it freezes inside the evaporator 4. In this embodiment, such a situation is avoided.

Fig. 4 shows a flowchart in the present embodiment. When the operation signal is turned off in step S1, the operation of the absorption chiller is stopped. If the operation signal is on, the operation of the absorption chiller is continued.

When the operation signal of the absorption chiller is turned off, a coolant pump interlock signal is generated in step S2. When the signal is on, the coolant pump 12 starts alone and the coolant liquid pump 13 starts and opens. The valve 20 opens for 5 minutes. Immediately thereafter, the opening / closing valve 20 is closed and the refrigerant liquid pump 13 stops. As a result, while the opening / closing valve 20 is opened for a predetermined time (for example, 5 minutes), a part of the refrigerant liquid accumulated in the bottom portion of the evaporator 4 by the refrigerant liquid pump 13 is connected to the pipeline ( R6) is supplied into the bottom of the absorber 5 through the refrigerant liquid bypass conduit 19 having a small flow path resistance. On the other hand, when the coolant pump interlock signal is turned off, the coolant pump 12 stops and the start signal of the cold / hot water pump 15 also turns off and stops.

In the present embodiment, when the cooling water pump 12 is started alone when the absorption chiller stops operating, the on / off valve 20 is opened to partially cool the liquid in the evaporator 4 to the refrigerant liquid pump 13. By supplying a predetermined amount to the absorber 5 via the refrigerant liquid bypass pipe 19, the concentration of the rare absorbent liquid in the absorber 5 decreases. For this reason, since the absorption capacity with respect to the refrigerant vapor which self-evaporates in the evaporator 4 falls, and the pressure fall in the absorber 5 can be suppressed, the amount of self-evaporation of refrigerant liquid can be suppressed small. When the amount of refrigerant vapor evaporated by self is reduced, excessive cooling of cold / hot water in the evaporator 4 can be suppressed. Thereby, freezing of cold / hot water during a driving stop can be prevented.

Third Embodiment

5 is a configuration diagram showing a third embodiment according to the present invention. In this embodiment, the structural member similar to the said 1st Embodiment attaches | subjects the same code | symbol as the above, and detailed description is abbreviate | omitted. In this embodiment, the cooling water bypass pipe line 21 which forms the cooling water bypass pipe line 21 which connects the upstream side from the absorber 5 of the said cooling water pipe 11, and the downstream side from the absorber 5 is formed. It is characterized by the configuration that the on-off valve 22 is provided in the).

In the present embodiment, when the cooling water pump 12 is started alone when the absorption chiller stops operating, the on / off valve 22 is opened so that a part of the cooling water is flow-resistant by the cooling water pump 12. The small cooling water bypass pipe 21 is passed through. Thus, the flow rate of the cooling water passing through the inside of the absorber 5 through the cooling water pipe 11 can be reduced. As a result, excessive cooling of the hot and cold water inside the evaporator 4 can be suppressed, and freezing of the hot and cold water can be prevented. In addition, the on-off valve 22 is closed during normal operation of the absorption chiller.

The present invention is particularly applicable to a dual-effect absorption chiller, and when the cooling water pump is started alone when the operation is stopped, it is possible to prevent freezing of cold and hot water on the load side inside the evaporator.

According to the invention of claim 1, in the dual-effect absorption chiller, when the cooling water pump is started alone when the operation is stopped, the hot and cold water pump installed in the cold / hot water pipe on the load side is interlocked so that the cold and hot water does not stagnate in the evaporator. do. Thereby, it is possible to avoid excessive cooling of the hot and cold water inside the evaporator under the influence of the cooling water. As a result, freezing of cold / hot water can be prevented.

According to the invention of claim 2, in the dual-effect absorption chiller, when the cooling water pump is started alone when the operation is stopped, the on / off valve is opened so that a portion of the refrigerant liquid is transferred through the refrigerant liquid bypass pipe by the refrigerant liquid pump. By supplying to an absorber, the density | concentration of the rare water absorption liquid in an absorber can be reduced. As a result, the rare water absorbing liquid becomes thin and the ability to absorb the refrigerant vapor decreases, so that the amount of self evaporation of the refrigerant liquid from the evaporator side can be reduced. As a result, the cooling of the cold / hot water by the heat of evaporation can be suppressed low and the freezing can be prevented.

According to the invention of claim 3, in the dual-effect absorption chiller, when the cooling water pump is started alone when the operation is stopped, the absorber is opened by circulating a part or all of the cooling water in the cooling water bypass pipe by opening and closing the valve. It is possible to reduce the flow rate of the cooling water passing through the inside of the. As a result, excessive cooling of hot and cold water in the evaporator can be suppressed by the influence of the cooling water passing through the inside of the absorber. As a result, freezing of cold / hot water can be prevented.

Claims (3)

The high temperature regenerator, the low temperature regenerator, the condenser, the evaporator, the absorber and the high temperature heat exchanger, the low temperature heat exchanger are connected by the conduit, and at the same time, after passing through the inside of the absorber, a cooling water pipe is formed which passes through the inside of the condenser, and passes through the inside of the evaporator. The cold and hot water pipe on the load side is formed, and the concentrated absorbent pump for supplying the concentrated absorbent liquid from the low temperature regenerator to the absorber, the rare absorbent pump for supplying the rare absorbent liquid from the absorber to the high temperature regenerator, and the refrigerant liquid stored at the bottom of the evaporator An absorption chiller equipped with a refrigerant liquid pump for supplying a refrigerant liquid distribution pipe formed at an upper part of an evaporator and a cooling water pump for supplying cooling water to the cooling water pipe, wherein the load side when the cooling water pump is started alone when the operation is stopped. Absorption refrigeration, characterized in that for operating the cold and hot water pump installed in the cold and hot water pipeline of the . The high temperature regenerator, the low temperature regenerator, the condenser, the evaporator, the absorber and the high temperature heat exchanger, the low temperature heat exchanger are connected by the conduit, and at the same time, after passing through the inside of the absorber, a cooling water pipe is formed which passes through the inside of the condenser, and passes through the inside of the evaporator. The cold and hot water pipe on the load side is formed, and the concentrated absorbent pump for supplying the concentrated absorbent liquid from the low temperature regenerator to the absorber, the rare absorbent pump for supplying the rare absorbent liquid from the absorber to the high temperature regenerator, and the refrigerant liquid stored at the bottom of the evaporator In an absorption chiller equipped with a refrigerant liquid pump for supplying a refrigerant liquid distribution pipe formed on an upper part of an evaporator and a cooling water pump for supplying cooling water to the cooling water pipe, the refrigerant liquid stored in the bottom of the evaporator by the refrigerant liquid pump. Downstream from the refrigerant liquid pump in a pipe for supplying the refrigerant to the refrigerant liquid dispersion pipe formed on the evaporator. A coolant liquid bypass pipe is formed between the side and the bottom of the absorber, and an on / off valve is provided in the coolant liquid bypass pipe. When the coolant pump is started alone when the operation stops, the open / close valve is opened. And a portion of the refrigerant liquid in the evaporator is opened and supplied to the absorber through the refrigerant liquid bypass pipe by the refrigerant liquid pump. The high temperature regenerator, the low temperature regenerator, the condenser, the evaporator, the absorber and the high temperature heat exchanger, the low temperature heat exchanger are connected by the conduit, and at the same time, after passing through the inside of the absorber, a cooling water pipe is formed which passes through the inside of the condenser, and passes through the inside of the evaporator. The cold and hot water pipe on the load side is formed, and the concentrated absorbent pump for supplying the concentrated absorbent liquid from the low temperature regenerator to the absorber, the rare absorbent pump for supplying the rare absorbent liquid from the absorber to the high temperature regenerator, and the refrigerant liquid stored at the bottom of the evaporator An absorption chiller provided with a refrigerant liquid pump for supplying a refrigerant liquid distribution pipe formed on an upper part of an evaporator, and a cooling water pump for supplying cooling water to the cooling water pipe, wherein an upstream side from an absorber of the cooling water pipe is connected to a downstream side from an absorber. To form a cooling water bypass pipe, and at the same time Installing the waste valve and, at the time of operation stop, the cooling water pump when a single start-up, an absorption refrigerating machine, comprising a step of opening the passage of some or all of the cooling water in the cooling water by-pass conduit to open and close the valve.

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