JP2011153795A - Absorption type refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorption type refrigerating machine avoiding crystallization of an absorbing solution. <P>SOLUTION: The absorption type refrigerating machine 100 includes a low heat source regenerator 9, a high-temperature regenerator 5, a low-temperature regenerator 6, an evaporator 1, a condenser 7 and an absorber 2, forms a circulation passage of the absorbing solution and a refrigerant by interconnecting these devices by piping, and can perform a single effect operation for heating the absorbing solution by using warm water supplied to the low heat source regenerator 9 as a heat source and a single/double effect operation or a double effect operation for heating the absorbing solution by using a heating means 4 disposed in the high-temperature regenerator 5 as a heat source. A warm water control valve 28 is provided in a low heat source supply pipe 16 supplying warm water serving as a heat source to the low heat source regenerator 9. The absorption type refrigerating machine further includes a warm water control means 50 measuring the frequency of operation of the heating means 4 when the temperature of the high-temperature regenerator 5 is a predetermined temperature or lower and fully closing the warm water control valve 28 when the measurement frequency reaches predetermined frequency. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an absorption refrigerator having a low heat source regenerator using hot water or the like as a heat source.

  Conventionally, a low heat source regenerator, a low heat source condenser, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser, and an absorber are provided, and these are connected by piping to form an absorption liquid and refrigerant circulation path, respectively. A type refrigerator is known (see, for example, Patent Document 1). In this absorption chiller, the rare absorption liquid in which the refrigerant is absorbed by the absorption liquid is supplied from the absorber to the low heat source regenerator and connected to the low heat source regenerator (for example, a solar water heater or a cogeneration system). It is heated and concentrated by the exhaust heat of the device, and becomes a rare intermediate absorbing liquid. The rare intermediate absorption liquid is supplied from the low heat source regenerator to the high temperature regenerator by the intermediate absorption liquid pump that operates when the liquid level in the high temperature regenerator becomes low, and is heated and concentrated by heating means such as a burner provided in the high temperature regenerator. As a result, a concentrated intermediate absorbing solution is obtained. If heating in the high-temperature regenerator is continued and the pressure in the high-temperature regenerator increases, the concentrated intermediate absorption liquid in the high-temperature regenerator will cause the intermediate absorption liquid pipe to reach the intermediate absorption liquid tube due to the pressure difference between the high-temperature regenerator and the low-temperature regenerator. Flows through to the low temperature regenerator.

JP 2006-343042 A

By the way, when the heat load is small and the cooling water temperature fluctuates significantly, the brine outlet temperature fluctuates greatly.
In the above-described conventional configuration, the heating means is controlled according to the outlet temperature of the brine supplied to the heat load (for example, the air conditioner). Is repeated. If the heating means is repeated on and off in a short time, the pressure in the high temperature regenerator will not increase and the concentrated intermediate absorption liquid in the high temperature regenerator will not flow to the low temperature regenerator, so the intermediate absorption liquid pump will not operate. The rare intermediate absorbing liquid is not sufficiently supplied to the high temperature regenerator. Therefore, the concentrated intermediate absorption liquid in the high-temperature regenerator continues to be concentrated, and as a result, the absorption liquid in the high-temperature regenerator and the intermediate absorption liquid pipe may be crystallized.
This invention is made | formed in view of the situation mentioned above, and it aims at providing the absorption refrigerator which avoids crystallization of an absorption liquid.

In order to achieve the above object, the present invention comprises a low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser, and an absorber, and these are connected by piping to circulate the absorption liquid and refrigerant. A single effect operation in which the absorbing liquid is heated using hot water supplied to the low heat source regenerator as a heat source, and a single double effect operation in which the absorbing liquid is heated using a heating means provided in the high temperature regenerator as a heat source. Alternatively, in an absorption chiller configured to be capable of double-effect operation, a hot water control valve is provided in a low heat source supply pipe for supplying hot water as a heat source to the low heat source regenerator, and the temperature of the high temperature regenerator is predetermined. When the temperature is equal to or lower than the temperature, the number of times that the heating means is operated is measured, and when the number of times reaches the predetermined number, the hot water control means for fully closing the hot water control valve is provided.
The said structure WHEREIN: The said warm water control means may cancel | release the full closure of the said warm water control valve, when the temperature of the said high temperature regenerator becomes more than predetermined temperature after fully closing the said warm water control valve.

The present invention also includes a low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser, and an absorber, and these are connected to form a circulation path for the absorbing liquid and the refrigerant, A single effect operation in which the absorbing liquid is heated using hot water supplied to the low heat source regenerator as a heat source, and a single double effect operation or a dual effect operation in which the absorbing liquid is heated using a heating means provided in the high temperature regenerator as a heat source; In the absorption refrigerator configured to be capable of providing a hot water control valve in a low heat source supply pipe for supplying hot water as a heat source to the low heat source regenerator, and when the heating time of the high temperature regenerator is a predetermined time or less, The system is characterized by comprising hot water control means for measuring the number of times the heating means is operated and fully closing the hot water control valve when the number of times reaches a predetermined number.
In the above configuration, the hot water control means cancels the full closure of the hot water control valve when heating occurs in which the heating time of the high temperature regenerator exceeds a predetermined time after the hot water control valve is fully closed. Also good.

The present invention also includes a low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser, and an absorber, and these are connected to form a circulation path for the absorbing liquid and the refrigerant, A single effect operation in which the absorbing liquid is heated using hot water supplied to the low heat source regenerator as a heat source, and a single double effect operation or a dual effect operation in which the absorbing liquid is heated using a heating means provided in the high temperature regenerator as a heat source; In the absorption refrigerator configured to be capable of heating, a hot water control valve is provided in a low heat source supply pipe for supplying hot water as a heat source to the low heat source regenerator, and the difference between the intermediate absorption liquid temperature and the intermediate absorption liquid crystal temperature Is provided with a hot water control means for fully closing the hot water control valve when the temperature falls below a predetermined temperature difference.
In the above configuration, the hot water control means, after fully closing the hot water control valve, when the difference between the intermediate absorbent temperature and the intermediate absorbent crystal temperature exceeds a predetermined temperature difference, Closing may be released.

  According to the present invention, a hot water control valve is provided in a low heat source supply pipe for supplying hot water as a heat source to the low heat source regenerator, and the number of times the heating means is operated when the temperature of the high temperature regenerator is lower than a predetermined temperature is measured. However, when the number of times of measurement reaches a predetermined number of times, since the hot water control means for fully closing the hot water control valve is provided, the amount of heating in the high temperature regenerator increases and the pressure in the high temperature regenerator increases, Since the absorption liquid flows from the high temperature regenerator and the liquid level of the high temperature regenerator is lowered, the rare intermediate absorption liquid is supplied to the high temperature regenerator, and crystallization of the absorption liquid can be avoided.

It is a schematic block diagram which shows the absorption type cold / hot water machine which concerns on 1st Embodiment. It is a flowchart which shows a 1st crystal | crystallization avoidance process. It is a schematic block diagram which shows the absorption type cold / hot water machine which concerns on 2nd Embodiment. It is a flowchart which shows a 2nd crystal | crystallization avoidance process. It is a schematic block diagram which shows the absorption type cold / hot water machine which concerns on 3rd Embodiment. It is a flowchart which shows a 3rd crystal | crystallization avoidance process.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a schematic configuration diagram of an absorption chiller / heater (absorption refrigeration machine) according to a first embodiment.
The absorption chiller / heater 100 is a single double-effect absorption chiller / heater using water as a refrigerant and a lithium bromide (LiBr) aqueous solution as an absorbent. As shown in FIG. 1, the absorption chiller / heater 100 includes an evaporator 1, an absorber 2 provided in parallel with the evaporator 1, and an evaporator absorber body that houses the evaporator 1 and the absorber 2. 3, a high-temperature regenerator 5 having a gas burner (heating means) 4, a low-temperature regenerator 6, a condenser 7 arranged in parallel with the low-temperature regenerator 6, and the low-temperature regenerator 6 and the condenser 7 are accommodated. The low-temperature regenerator condenser body 8, the low heat source regenerator 9 using hot water supplied from other equipment as a heat source, the low heat source condenser 10 arranged in parallel to the low heat source regenerator 9, A low heat source regenerator condenser body 11 containing a heat source regenerator 9 and a low heat source condenser 10, a low temperature heat exchanger 12, a high temperature heat exchanger 13, a rare absorbent pump P1, and an intermediate absorbent pump P2. The refrigerant pump P3, and each of these devices has absorption liquid pipes 21 to 26 and refrigerant pipes 31 to 36. Connected by piping through etc..
The low temperature regenerator condenser cylinder 8 is arranged at a position higher than the evaporator absorber cylinder 3 and the high temperature regenerator 5, and the low heat source regenerator condenser cylinder 11 is arranged at a position higher than the low temperature regenerator condenser cylinder 8. .

  Reference numeral 14 denotes a cold / hot water pipe for circulatingly supplying brine heat exchanged with the refrigerant in the evaporator 1 to a heat load (not shown) (for example, an air conditioner). A heat transfer tube 14 </ b> A formed in the section is arranged in the evaporator 1. Further, a temperature sensor 61 for measuring the temperature of the brine flowing through the cold / hot water pipe 14 is provided on the downstream side of the heat transfer pipe 14 </ b> A of the cold / hot water pipe 14. Reference numeral 15 denotes a cooling water pipe for sequentially circulating cooling water to the absorber 2, the condenser 7 and the low heat source condenser 10, and each heat transfer pipe 15 </ b> A, 15 </ b> B, 15 </ b> C formed in a part of the cooling water pipe 15. Are disposed in the absorber 2, the condenser 7, and the low heat source condenser 10, respectively. Reference numeral 16 is for circulating and supplying relatively low temperature (eg, about 80 ° C.) hot water generated by a heat source generator (not shown) (eg, a solar water heater or a cogeneration device) to the low heat source regenerator 9. This is a low heat source supply pipe. The low heat source supply pipe 16 adjusts the flow rate of hot water supplied to the heat transfer pipe 16A, a heat transfer pipe 16A disposed in the low heat source regenerator 9, a bypass pipe 16B connected in parallel to the heat transfer pipe 16A, and the heat transfer pipe 16A. And a three-way valve (hot water control valve) 28 that can be switched for this purpose. Reference numeral 50 denotes a control device (hot water control means) that controls the absorption chiller / heater 100 as a whole. The temperature sensor 61 outputs the measured brine temperature to the control device 50.

  The absorber 2 has a function of absorbing the refrigerant vapor evaporated in the evaporator 1 into the absorption liquid and maintaining the pressure in the evaporator absorber body 3 in a high vacuum state. Under the absorber 2, a rare absorbing liquid reservoir 2A is formed in which the diluted absorbing liquid diluted by absorbing the refrigerant vapor is accumulated. The rare absorbing liquid reservoir 2A has a rare absorbing liquid pump P1. One end of the liquid pipe 21 is connected, and the other end of the rare absorbent liquid pipe 21, that is, the downstream side of the rare absorbent liquid pump P1 is formed in the upper part in the low heat source regenerator 9 after passing through the low temperature heat exchanger 12. The gas layer 9A is opened.

In the lower part of the low heat source regenerator 9, there is formed an absorption liquid reservoir 9B in which the absorption liquid supplied through the rare absorption liquid pipe 21 is accumulated. The absorption liquid reservoir 9B is formed in a part of the low heat source supply pipe 16. A heat transfer tube 16A is arranged. By circulating hot water through the low heat source supply pipe 16, the absorption liquid can be heated and regenerated through the heat transfer pipe 16A, that is, the refrigerant in the absorption liquid can be evaporated to concentrate the absorption liquid.
One end of a first intermediate absorption liquid pipe 22 having an intermediate absorption liquid pump P2 is connected to the absorption liquid reservoir 9B, and the other end of the first intermediate absorption liquid pipe 22, that is, downstream of the intermediate absorption liquid pump P2. After passing through the high-temperature heat exchanger 13, the side opens to the gas layer part 5 </ b> B located above the heat exchange part 5 </ b> A formed in the high-temperature regenerator 5.

  A gas burner 4 including an igniter 4A that ignites fuel such as city gas and a fuel control valve 4B that controls the amount of fuel to change the amount of heat source is accommodated in the lower portion of the high-temperature regenerator 5. When the gas burner 4 receives the combustion signal output from the control device 50, the gas burner 4 burns the gas. The high-temperature regenerator 5 is formed with a heat exchanging unit 5 </ b> A that heats and regenerates the absorbing liquid using the flame of the gas burner 4 as a heat source above the gas burner 4. An exhaust path 17 through which exhaust gas combusted by the gas burner 4 circulates is connected to the heat exchanging section 5A, and the heat exchanging section 5A is connected to the side of the heat exchanging section 5A after being heated and regenerated by the heat exchanging section 5A. An intermediate absorption liquid reservoir 5C is formed in which the intermediate absorption liquid flowing out from the portion 5A is accumulated. The intermediate absorption liquid reservoir 5C is provided with a liquid level electrode (liquid level detection sensor) 51 for detecting the liquid level of the absorption liquid stored in the intermediate absorption liquid reservoir 5C. When the liquid level electrode 51 detects that the liquid level of the absorbing liquid stored in the intermediate absorbing liquid reservoir 5C is higher than the lower end of the liquid level electrode 51, the liquid level electrode 51 controls the detection result. Output to the device 50.

  One end of a second intermediate absorption liquid pipe (intermediate absorption liquid pipe) 23 is connected to the lower end of the intermediate absorption liquid reservoir 5C, and the other end of the second intermediate absorption liquid pipe 23 is formed in the upper portion of the low temperature regenerator 6. The gas layer 6A is opened. In addition, a high temperature heat exchanger 13 is provided on the intermediate absorbing liquid reservoir 5 </ b> C side of the second intermediate absorbing liquid pipe 23. The high-temperature heat exchanger 13 heats the absorption liquid flowing through the first intermediate absorption liquid pipe 22 with the heat of the high-temperature intermediate absorption liquid flowing out from the intermediate absorption liquid reservoir 5C, and the gas burner 4 in the high-temperature regenerator 5 is heated. It aims to reduce fuel consumption. Further, the upstream side of the second intermediate absorption liquid pipe 23 at the high temperature heat exchanger 13 and the absorber 2 are connected by an absorption liquid pipe 24 with an on-off valve V1 interposed therebetween.

  The low-temperature regenerator 6 uses the refrigerant vapor separated by the high-temperature regenerator 5 as a heat source to heat and regenerate the absorption liquid stored in the absorption liquid reservoir 6B formed below the gas layer portion 6A. In 6B, a heat transfer tube 31A formed in a part of the refrigerant tube 31 extending from the upper end of the high temperature regenerator 5 to the bottom of the condenser 7 is disposed. By circulating the refrigerant vapor through the refrigerant pipe 31, the heat of the refrigerant vapor is transmitted to the absorption liquid stored in the absorption liquid reservoir 6B via the heat transfer pipe 31A, and the absorption liquid is further concentrated.

  One end of a concentrated absorption liquid pipe 25 is connected to the lower end of the absorption liquid reservoir 6B of the low-temperature regenerator 6, and the other end of the concentrated absorption liquid pipe 25 is provided at the upper part of the gas layer portion 2B of the absorber 2. It is connected to the liquid spreader 2C. The concentrated absorption liquid pipe 25 is provided with a low-temperature heat exchanger 12. The low-temperature heat exchanger 12 heats the rare absorbent flowing through the rare absorbent pipe 21 with the warm heat of the concentrated absorbent flowing out from the absorbent reservoir 6B of the low-temperature regenerator 6. The upstream side of the low-temperature heat exchanger 12 of the concentrated absorbent pipe 25 and the upstream side of the intermediate absorbent pump P2 of the first intermediate absorbent pipe 22 are connected by a bypass pipe 26, and this intermediate absorbent pump P2 When the operation is stopped, the absorption liquid flowing out from the absorption liquid reservoir 9B of the low heat source regenerator 9 is the first intermediate absorption liquid pipe 22, the bypass pipe 26, the low temperature heat exchanger 12, and the concentrated absorption liquid pipe. 25 and supplied into the absorber 2.

As described above, the gas layer portion 5B of the high temperature regenerator 5 and the bottom portion of the condenser 7 are connected by the refrigerant pipe 31 via the heat transfer pipe 31A piped to the absorption liquid reservoir 6B of the low temperature regenerator 6. The heat transfer pipe 31A upstream side of the refrigerant pipe 31 and the gas layer portion 2B of the absorber 2 are connected by a refrigerant pipe 32 having an on-off valve V2.
Further, the bottom portion of the condenser 7 and the gas layer portion 1A of the evaporator 1 are connected by a refrigerant pipe 33 with a U seal portion 33A interposed therebetween. The U seal portion 33A of the refrigerant pipe 33 and the bottom side of the low heat source condenser 10 Are connected by a refrigerant pipe 34. A refrigerant liquid reservoir 1B in which liquefied refrigerant accumulates is formed below the evaporator 1, and the refrigerant liquid reservoir 1B and the spreader 1C disposed above the gas layer portion 1A of the evaporator 1 are refrigerant pumps P3. Are connected by a refrigerant pipe 35. The refrigerant pipe 35 is connected to the downstream side of the refrigerant pump P3 and the absorbing liquid reservoir 2A of the absorber 2 through a refrigerant pipe 36 with an on-off valve V3 interposed therebetween. Further, the outlet side of the heat transfer pipe 14A of the cold / hot water pipe 14 and the outlet side of the heat transfer pipe 15B of the cooling water pipe 15 are connected by a communication pipe 37 having an on-off valve V4 interposed therebetween.

Next, the operation will be described.
During a cooling operation such as cooling, the evaporator 1 outlet side temperature (temperature measured by the temperature sensor 61) of brine (for example, cold water) circulated and supplied to a heat load (not shown) via the cold / hot water pipe 14 is set. The amount of heat input to the absorption chiller / heater 100 is controlled by the controller 50 so as to reach a predetermined set temperature, for example, 7 ° C.
Specifically, for example, the control device 50 has a large heat load, and the temperature of hot water supplied to the low heat source regenerator 9 via the low heat source supply pipe 16 reaches a predetermined temperature (for example, 85 ° C.). Sometimes, a rated amount of hot water is supplied from the low heat source supply pipe 16 to the low heat source regenerator 9, all pumps P1 to P3 are started, and a single double effect operation is performed in which gas is burned in the gas burner 4. The heating power of the gas burner 4 is controlled so that the temperature measured by the sensor 61 is a predetermined 7 ° C.

  In this case, the rare absorption liquid conveyed from the absorber 2 to the low heat source regenerator 9 by the rare absorption liquid pump P1 through the rare absorption liquid pipe 21 is low in the absorption liquid reservoir 9B in the low heat source regenerator 9. When the hot water supplied from the heat source supply pipe 16 is heated through the pipe wall of the heat transfer pipe 16A, the refrigerant in the rare absorbent is evaporated and separated.

The rare intermediate absorbent whose concentration has been increased by evaporating and separating the refrigerant is heated by the intermediate absorbent pump P2 of the first intermediate absorbent pipe 22 via the high temperature heat exchanger 13 and sent to the high temperature regenerator 5. It is done. Note that the control device 50 determines that the intermediate absorption liquid pump until the liquid level of the absorption liquid stored in the intermediate absorption liquid reservoir 5C of the high-temperature regenerator 5 reaches a predetermined position higher than the lower end of the liquid level electrode 51. When P2 is operated and this predetermined position is reached, the operation of the intermediate absorbent pump P2 is stopped. Since the rare intermediate absorption liquid conveyed to the high temperature regenerator 5 is heated by the flame by the gas burner 4 and the high-temperature combustion gas in the high temperature regenerator 5, the refrigerant in the rare intermediate absorption liquid evaporates and separates. At this time, since the pressure in the high-temperature regenerator 5 is increased by heating, the concentrated intermediate absorption liquid whose concentration has been increased by evaporating and separating the refrigerant in the high-temperature regenerator 5 is obtained from the high-temperature regenerator 5 and the low-temperature regenerator 6. Is sent to the low temperature regenerator 6 via the high temperature heat exchanger 13 at a flow rate determined by the liquid level difference and the pressure difference.
The concentrated intermediate absorption liquid is heated in the low-temperature regenerator 6 by the high-temperature refrigerant vapor supplied from the high-temperature regenerator 5 through the refrigerant pipe 31 and flowing into the heat transfer pipe 31A, and the refrigerant is further separated to further increase the concentration. The concentrated absorbent is sent to the absorber 2 via the low-temperature heat exchanger 12, and is sprayed from above the concentrated liquid spreader 2C.

On the other hand, the refrigerant separated and generated by the low heat source regenerator 9 enters the low heat source condenser 10 and condenses, and the refrigerant separated and generated by the low temperature regenerator 6 enters the condenser 7 and condenses. The refrigerant liquid generated by the condenser 7 enters the evaporator 1 through the refrigerant pipe 33 and the refrigerant liquid condensed and generated by the low heat source condenser 10 via the refrigerant pipe 34, and is pumped by the operation of the refrigerant pump P3. Then, it is sprayed on the heat transfer tube 14A of the cold / hot water tube 14 from the sprayer 1C.
The refrigerant liquid sprayed on the heat transfer tube 14A evaporates by removing vaporization heat from the brine passing through the inside of the heat transfer tube 14A, so that the brine passing through the inside of the heat transfer tube 14A is cooled, and the brine thus lowered in temperature is A cooling operation such as cooling is performed by supplying the heat load from the cold / hot water pipe 14.
Then, the refrigerant evaporated in the evaporator 1 enters the absorber 2, is absorbed by the concentrated absorbent supplied from the low temperature regenerator 6 and sprayed from above, and accumulates in the rare absorbent reservoir 2A of the absorber 2, The circulation conveyed to the low heat source regenerator 9 by the absorption liquid pump P1 is repeated.

  During the single double effect operation, the amount of heating by the gas burner 4, specifically, the amount of gas supplied to the gas burner 4 is controlled by the controller 50 so that the temperature measured by the temperature sensor 61 becomes a predetermined 7 ° C. The And even if the amount of heating by the gas burner 4 is minimized, when the temperature sensor 61 measures a temperature lower than a predetermined 7 ° C., the control device 50 stops the combustion of the gas and stops the heating by the gas burner 4 to perform the single effect operation. Migrate to

The absorption liquid in the single effect operation is heated in the low heat source regenerator 9 by hot water supplied from the low heat source supply pipe 16 to evaporate and separate the refrigerant. Then, the absorption liquid whose absorption liquid concentration has increased is returned to the absorber 2 via the bypass pipe 26 and the low-temperature heat exchanger 12.
On the other hand, the refrigerant vapor separated and generated by the low heat source regenerator 9 enters the low heat source condenser 10 and condenses, and flows into the evaporator 1 via the refrigerant pipe 34. The refrigerant liquid flowing into the evaporator 1 is sprayed from the sprayer 1C onto the heat transfer pipe 14A of the cold / hot water pipe 14 by the operation of the refrigerant pump P3, and evaporates by taking heat from the brine passing through the heat transfer pipe 14A. Then, circulation is performed which is absorbed into the absorbing liquid sprayed from above by entering the absorber 2. Note that the heat generated when the absorbing liquid absorbs the refrigerant is cooled by the heat transfer pipe 15 </ b> A of the cooling water pipe 15 disposed in the absorber 2.

During the single effect operation, the amount of heating in the low heat source regenerator 9, specifically, hot water taken into the heat transfer pipe 16 </ b> A from the low heat source supply pipe 16 so that the temperature measured by the temperature sensor 61 becomes a predetermined 7 ° C. The amount, that is, the opening degree of the three-way valve 28 is controlled by the control device 50.
And even if the three-way valve 28 is operated so that the whole amount of hot water flowing through the low heat source supply pipe 16 flows into the heat transfer pipe 16A, when the temperature sensor 61 does not measure a temperature of 7 ° C. or less, the temperature is as described above. The gas is burned by the gas burner 4, the heating regeneration of the absorbing liquid and the generation of the refrigerant vapor in the high temperature regenerator 5 are resumed, and the single double effect operation is resumed.

  Further, during the single effect operation, although the heat load is large, the temperature of the hot water supplied to the low heat source regenerator 9 through the low heat source supply pipe 16 is lowered to a predetermined 85 ° C. or less (for example, due to bad weather etc.) When the temperature of the hot water supplied from the solar water heater is not stable), the three-way valve 28 is switched so that the hot water is not supplied from the low heat source supply pipe 16 to the low heat source regenerator 9, and all the pumps P1 to P3 are activated. In addition, a double-effect operation in which gas is burned in the gas burner 4 is performed. Also in this case, the heating power of the gas burner 4 is controlled by the control device 50 so that the temperature of the brine measured by the temperature sensor 61 becomes a predetermined temperature of 7 ° C.

  In this double effect operation, the rare absorbent in the rare absorbent reservoir 2A of the absorber 2 is conveyed to the low heat source regenerator 9 by the rare absorbent pump P1 and stored in the absorbent reservoir 9B. Is not supplied with hot water as a heat source. For this reason, the rare absorption liquid conveyed to the low heat source regenerator 9 is conveyed to the high temperature regenerator 5 via the high temperature heat exchanger 13 by the operation of the intermediate absorption liquid pump P2 without being heated, and thereafter the single absorption liquid is single-layered. In the same manner as in the double effect operation, the refrigerant is heated while being circulated, and the high temperature regenerator 5 and the low temperature regenerator 6 concentrate and regenerate the absorption liquid and separate and produce the refrigerant. During this double effect operation, when the temperature of the hot water supplied to the low heat source regenerator 9 reaches a predetermined 85 ° C., a single double effect operation or a single effect operation is performed according to the size of the cooling load.

  In the absorption chiller / heater 100, when the heat load is small and the cooling water temperature fluctuates significantly, the brine outlet temperature fluctuates greatly. Since the gas burner 4 is controlled according to the temperature of the brine measured by the temperature sensor 61, the combustion / extinguishing of the gas burner 4 is repeated when the fluctuation of the outlet temperature of the brine is severe. If combustion / extinguishing of the gas burner 4 is repeated in a short time, the pressure in the high-temperature regenerator 5 does not increase, and the concentrated intermediate absorbent in the high-temperature regenerator 5 does not flow to the low-temperature regenerator 6. P2 is not operated, and the rare intermediate absorbing liquid is not sufficiently supplied to the high temperature regenerator 5. As a result, the concentrated intermediate absorbent in the high temperature regenerator 5 continues to be concentrated, and as a result, the concentrated intermediate absorbent in the high temperature regenerator 5 and the second intermediate absorbent pipe 23 may crystallize.

Since there is a relative relationship between the pressure in the high temperature regenerator 5 and the temperature of the high temperature regenerator 5, a temperature sensor 62 for measuring the temperature of the high temperature regenerator 5 is provided in the present embodiment. The temperature sensor 62 outputs the measured temperature of the high-temperature regenerator 5 to the control device 50, and the control device 50 corresponds to the temperature of the high-temperature regenerator 5 measured by the temperature sensor 62 and the number of combustions (measurement times) of the gas burner 4. A first crystal avoidance process for controlling the three-way valve 28 is executed.
The process in which the three-way valve 28 is controlled according to the temperature of the brine measured by the temperature sensor 61 and the temperature of the hot water supplied through the low heat source supply pipe 16 is referred to as a normal process.

Hereinafter, the first crystal avoidance process will be described with reference to FIG.
When the cooling operation of the absorption chiller / heater 100 is started, the controller 50 executes the first crystal avoidance process. In the first crystal avoidance process, the controller 50 first sets the number of combustion N to 0 in the initial state (step S1), and the temperature of the high temperature regenerator 5 (high temperature regenerator temperature T) measured by the temperature sensor 62 is set. It is determined whether or not the temperature is a first temperature (predetermined temperature) T1 (step S2). The first temperature T1 is the temperature of the high temperature regenerator 5 when the pressure of the high temperature regenerator 5 decreases and the concentrated intermediate absorption liquid in the high temperature regenerator 5 becomes difficult to flow into the low temperature regenerator 6, and is previously determined by experiments or the like. Has been acquired.

  When the high temperature regenerator temperature T is equal to or lower than the first temperature T1 (step S2: YES), the control device 50 determines whether or not the combustion signal is ON (step S3), and when the combustion signal is OFF (step S3). : NO), the process of step S2 is repeated. When the combustion signal is ON (step S3: YES), the control device 50 sets a value (N + 1) obtained by adding “1” to the current combustion number N as a new combustion number N (N = N + 1) (step S4), it is determined whether or not the set number of combustions N is equal to or greater than a predetermined number N1 (step 5). Here, the predetermined number of times N1 is the pressure in the high temperature regenerator 5 until the concentrated intermediate absorbent in the high temperature regenerator 5 does not flow to the low temperature regenerator 6 when the high temperature regenerator temperature T is equal to or lower than the first temperature T1. Is the number of times of combustion when the concentrated intermediate absorbent in the high-temperature regenerator 5 and the second intermediate absorbent pipe 23 may crystallize, and is obtained in advance through experiments or the like.

When the number of combustion N is smaller than the predetermined number N1 (step S5: NO), the control device 50 returns the process to step S2.
On the other hand, when the combustion frequency N is equal to or greater than the predetermined frequency N1 (step S5: YES), the control device 50 determines that there is a possibility that the absorption liquid in the high temperature regenerator 5 or the second intermediate absorption liquid pipe 23 may crystallize, The three-way valve 28 is forcibly fully closed (step S6). As a result, a double-effect operation in which gas is burned by the gas burner 4 is performed, and the pressure in the high-temperature regenerator 5 is increased. From 5, the concentrated intermediate absorbent flows into the low temperature regenerator 6. As a result, the intermediate absorbent pump P2 is operated and the rare intermediate absorbent is supplied to the high-temperature regenerator 5, so that the concentrated intermediate absorbent is prevented from being excessively concentrated, and crystals of the absorbent are avoided. The

Then, the control device 50 returns the process to step S2 with the three-way valve 28 fully closed until the high temperature regenerator temperature T becomes higher than the first temperature T1 (step S2: NO). Repeat the process.
When the high temperature regenerator temperature T becomes higher than the first temperature T1 (step S2: NO), the control device 50 determines whether or not the high temperature regenerator temperature T is equal to or higher than the second temperature (predetermined temperature) T2 (step S7). In the second temperature T2, the high temperature regenerator 5 is continuously heated, the pressure in the high temperature regenerator 5 rises, and the concentrated intermediate absorption liquid in the high temperature regenerator 5 flows sufficiently to the low temperature regenerator 6. Is the temperature of the high-temperature regenerator 5 at the time, and has been obtained in advance by experiments or the like. The second temperature T2 is set higher than the first temperature T1.

When the high temperature regenerator temperature T is lower than the second temperature T2 (step S7: NO), the control device 50 returns the process to step S2.
On the other hand, when the high temperature regenerator temperature T is equal to or higher than the second temperature T2 (step S7: YES), the controller 50 has no fear that the absorption liquid in the high temperature regenerator 5 or the second intermediate absorption liquid pipe 23 is crystallized. Judgment is made, the fully closed state of the three-way valve 28 is released, and the process returns to step S1 (step S8). As a result, the control of the three-way valve 28 is returned to the normal processing, so that the exhaust heat of a heat source generator (not shown) can be used effectively.
Thus, in the first crystal avoidance process, the three-way valve 28 is controlled in accordance with the high temperature regenerator temperature T measured by the temperature sensor 62 and the number of combustions N of the gas burner 4, so that the pressure in the high temperature regenerator 5 is detected. Since it is not necessary to provide a pressure sensor, an increase in cost due to the execution of the first crystal avoidance process can be suppressed.

  As described above, according to the present embodiment, the three-way valve 28 is provided in the low heat source supply pipe 16 that supplies the hot water serving as the heat source to the low heat source regenerator 9, and the high temperature regenerator temperature T is equal to or lower than the first temperature T1. In this case, the number of times the gas burner 4 for heating the high temperature regenerator 5 is actuated is measured, and when the combustion number N reaches a predetermined number N1, the controller 50 is provided to fully close the three-way valve 28. Since the amount of heating in the regenerator 5 increases and the pressure in the high temperature regenerator 5 increases, the concentrated intermediate absorption liquid flows from the high temperature regenerator 5 to the low temperature regenerator 6 and the liquid level of the high temperature regenerator 5 decreases. The intermediate absorbent is supplied to the high-temperature regenerator 5, and as a result, the concentrated intermediate absorbent can be prevented from being excessively concentrated, and crystallization of the absorbent can be avoided.

  Further, according to the present embodiment, the control device 50 releases the fully closed state of the three-way valve 28 when the high temperature regenerator temperature T becomes equal to or higher than the second temperature T2 after the three-way valve 28 is fully closed. Therefore, when the pressure in the high temperature regenerator 5 rises to such an extent that the concentrated intermediate absorption liquid flows from the high temperature regenerator 5 to the low temperature regenerator 6, the three-way valve 28 is fully closed, so that the heat source generator Waste heat can be used effectively.

[Second Embodiment]
FIG. 3 is a schematic configuration diagram showing an absorption chiller / heater (absorption refrigerator) according to the second embodiment. The absorption chiller / heater 200 according to the present embodiment is not provided with the temperature sensor 62 in the high-temperature regenerator 5, and is provided with the above-described absorption type in that it includes time measuring means 52 for measuring the combustion time (heating time) of the gas burner 4. The configuration is different from that of the cold / hot water machine 100. Since the other structure is the same as that of the absorption chiller / heater 100, the same reference numerals are given and the description thereof is omitted.
The time measuring means 52 measures the combustion time of the gas burner 4 under the control of the control device 50 and outputs the measurement result to the control device 50.
In the present embodiment, the control device 50 executes the second crystal avoidance process for controlling the three-way valve 28 in accordance with the combustion time measured by the time measuring means 52 and the number of combustion times (measurement number) of the gas burner 4.

Hereinafter, the second crystal avoidance process will be described with reference to FIG.
When the cooling operation of the absorption chiller / heater 100 is started, the controller 50 executes the second crystal avoidance process. In the second crystal avoidance process, the control device 50 first sets the number of combustions N to 0 in the initial state (step S11), and causes the time measuring means 52 to measure the combustion time t of the gas burner 4 (step S12). When the combustion of the gas burner 4 is completed and the combustion time t is output from the time measuring means 52 to the control device 50, the control device 50 determines whether the combustion time t measured by the time measuring means 52 is equal to or less than the first time (predetermined time) t1. It is determined whether or not (step S13). The first time t1 is a time indicating that the combustion time t is relatively short, and is acquired in advance by an experiment or the like.

  When the combustion time t is equal to or shorter than the first time t1 (step S13: YES), the control device 50 sets a value (N + 1) obtained by adding “1” to the current combustion frequency N as a new combustion frequency N (N = N + 1) (step S14), it is determined whether or not the set number of combustions N is equal to or greater than the predetermined number N2 (step 15). Here, the predetermined number of times N2 is such that the combustion in the first time t1 or less continues, and the pressure in the high temperature regenerator 5 decreases to such an extent that the concentrated intermediate absorbent in the high temperature regenerator 5 does not flow into the low temperature regenerator 6. Is the number of times that the concentrated intermediate absorbent in the high-temperature regenerator 5 or the second intermediate absorbent pipe 23 may crystallize, and is obtained in advance through experiments or the like.

When the number N of combustion is less than the predetermined number N2 (step S15: NO), the control device 50 returns the process to step S12.
On the other hand, when the combustion frequency N is equal to or greater than the predetermined frequency N2 (step S15: YES), the control device 50 determines that there is a possibility that the absorption liquid in the high temperature regenerator 5 or the second intermediate absorption liquid pipe 23 may be crystallized. The three-way valve 28 is forcibly fully closed (step S16). As a result, a double-effect operation in which gas is burned by the gas burner 4 is performed, and the pressure in the high-temperature regenerator 5 is increased. Therefore, the high-pressure regenerator is caused by the pressure difference between the high-temperature regenerator 5 and the low-temperature regenerator 6. From 5, the concentrated intermediate absorbent flows into the low temperature regenerator 6. As a result, the intermediate absorbent pump P2 is operated and the rare intermediate absorbent is supplied to the high-temperature regenerator 5, so that the concentrated intermediate absorbent is prevented from being excessively concentrated, and crystals of the absorbent are avoided. The

And the control apparatus 50 returns a process to step S12, fully closing the three-way valve 28, and performs the process of step S12-S16 until combustion time t exceeding 1st time t1 arises (step S13: NO). repeat.
When the combustion time t exceeding the first time t1 occurs (step S13: NO), the control device 50 determines whether or not the combustion time t is equal to or longer than the second time (predetermined time) t2 (step S17). During the second time t2, the high temperature regenerator 5 is continuously heated, the pressure in the high temperature regenerator 5 rises, and the concentrated intermediate absorbent in the high temperature regenerator 5 sufficiently flows into the low temperature regenerator 6. It is time, and is acquired in advance by experiments or the like. The second time t2 is set higher than the first time t1.

When the combustion time t has not reached the second time t2 (step S17: NO), the control device 50 returns the process to step S12.
On the other hand, when the combustion time t is equal to or longer than the second time t2 (step S17: YES), the control device 50 determines that there is no possibility that the absorption liquid in the high temperature regenerator 5 or the second intermediate absorption liquid pipe 23 is crystallized. Then, the three-way valve 28 is fully closed, and the process returns to step S11 (step S18). As a result, the control of the three-way valve 28 is returned to the normal processing, so that the exhaust heat of a heat source generator (not shown) can be used effectively.
As described above, in the second crystal avoidance process, the three-way valve 28 is controlled in accordance with the combustion time t and the number of combustion times N of the gas burner 4, so that it is necessary to provide a pressure sensor and a temperature sensor for detecting the pressure in the high temperature regenerator 5. Therefore, the cost increase due to the execution of the second crystal avoidance process can be suppressed.

  As described above, according to the present embodiment, the three-way valve 28 is provided in the low heat source supply pipe 16 that supplies the hot water as the heat source to the low heat source regenerator 9, and the heating time t of the high temperature regenerator 5 is the first. Since the number of combustions of the gas burner 4 that heats the high-temperature regenerator 5 is measured when the time t1 or less, and the combustion number N reaches a predetermined number N2, the controller 50 is provided to fully close the three-way valve 28. Since the amount of heating in the regenerator 5 increases and the pressure in the high temperature regenerator 5 increases, the concentrated intermediate absorption liquid flows from the high temperature regenerator 5 to the low temperature regenerator 6 and the liquid level of the high temperature regenerator 5 decreases. The rare intermediate absorbing liquid is supplied to the high temperature regenerator 5, and as a result, the concentrated intermediate absorbing liquid can be prevented from being excessively concentrated, and the crystallization of the absorbing liquid can be avoided.

  Further, according to the present embodiment, the control device 50 fully closes the three-way valve 28 when the heating time t of the high temperature regenerator 5 becomes the second time t2 or more after the three-way valve 28 is fully closed. When the pressure in the high temperature regenerator 5 rises to such an extent that the concentrated intermediate absorbent flows from the high temperature regenerator 5 to the low temperature regenerator 6, the three-way valve 28 is fully closed. The exhaust heat of the generator can be used effectively.

[Third Embodiment]
FIG. 5 is a schematic configuration diagram illustrating an absorption chiller / heater (absorption chiller) according to a third embodiment. The absorption chiller / heater 300 according to the present embodiment includes a temperature sensor 63 that measures the temperature of the liquid refrigerant in the refrigerant pipe 31 and a temperature sensor that measures the temperature of the concentrated intermediate absorption liquid in the second intermediate absorption liquid pipe 23. 64 is different from the above-described absorption chiller / heater 100 in that the configuration is different. Since the other structure is the same as that of the absorption chiller / heater 100, the same reference numerals are given and the description thereof is omitted.

The temperature sensor 63 is provided on the refrigerant pipe 31 on the outlet side of the low temperature regenerator 6, measures the temperature of the liquid refrigerant, and outputs the measurement result to the control device 50. The temperature sensor 64 is provided on the outlet side of the high-temperature heat exchanger 13 of the second intermediate absorption liquid pipe 23, measures the temperature of the concentrated intermediate absorption liquid, and outputs the measurement result to the control device 50. Here, the concentrated intermediate absorption liquid is heat-exchanged by the high-temperature heat exchanger 13 of the second intermediate absorption liquid pipe 23 and the temperature is lowered, so that the concentrated intermediate absorption liquid is easily crystallized downstream of the high-temperature heat exchanger 13.
In the present embodiment, the control device 50 has a three-way valve according to the temperature difference between the crystal temperature calculated based on the temperature measured by the temperature sensors 62 and 63 and the temperature of the concentrated intermediate absorbent measured by the temperature sensor 64. A third crystal avoidance process for controlling 28 is executed.

Hereinafter, the third crystal avoidance process will be described with reference to FIG.
When the cooling operation of the absorption chiller / heater 100 is started, the controller 50 executes the third crystal avoidance process. In the third crystal avoidance process, the control device 50 first calculates the pressure in the high-temperature regenerator 5 by applying the temperature of the liquid refrigerant measured by the temperature sensor 63 to an empirical formula acquired in advance through experiments or the like. By applying the pressure in the regenerator 5 and the temperature of the high-temperature regenerator 5 measured by the temperature sensor 62 to a previously stored Düring diagram, the concentration of the concentrated intermediate absorbent in the high-temperature regenerator 5 (dense intermediate Absorbent concentration X) is calculated (step S21).

  Next, the controller 50 calculates the crystal temperature T0 by applying the calculated concentrated intermediate absorbent concentration X to an empirical formula acquired in advance through experiments or the like (step S22), and the concentration of the concentrated intermediate absorbent measured by the temperature sensor 64 is calculated. A temperature difference ΔT (ΔT = TC−T0) between the high-temperature heat exchanger 13 outlet side temperature (concentrated intermediate absorbent temperature TC) and the calculated crystal temperature T0 is calculated (step S23). Then, the control device 50 determines whether or not the calculated temperature difference ΔT is lower than the first temperature difference (predetermined temperature difference) α (step S24). The first temperature difference α is a temperature indicating a state in which the concentrated intermediate absorption liquid may be crystallized, and is acquired in advance by an experiment or the like.

  When the calculated temperature difference ΔT is lower than the first temperature difference α (step S24: YES), the control device 50 determines that the absorbing liquid in the high temperature regenerator 5 or the second intermediate absorbing liquid pipe 23 may be crystallized. Then, the three-way valve 28 is forcibly fully closed (step S25). As a result, a double-effect operation in which gas is burned by the gas burner 4 is performed, and the pressure in the high-temperature regenerator 5 is increased. From 5, the concentrated intermediate absorbent flows into the low temperature regenerator 6. As a result, the intermediate absorbent pump P2 is operated and the rare intermediate absorbent is supplied to the high-temperature regenerator 5, so that the concentrated intermediate absorbent is prevented from being excessively concentrated, and crystals of the absorbent are avoided. The

Then, the control device 50 returns the process to step S21 with the three-way valve 28 fully closed until the temperature difference ΔT becomes equal to or greater than the first temperature difference α (step S24: NO). repeat.
When the temperature difference ΔT is greater than or equal to the first temperature difference α (step S24: NO), the control device 50 determines whether or not the temperature difference ΔT is higher than the second temperature difference (predetermined temperature difference) β (step S26). The second temperature difference β is a temperature indicating a state in which the concentrated intermediate absorption liquid is not likely to be crystallized, and is acquired in advance by an experiment or the like.

When temperature difference (DELTA) T is below 2nd temperature difference (step S26: NO), the control apparatus 50 returns a process to step S21.
On the other hand, when the temperature difference ΔT is higher than the second temperature difference (step S26: YES), the control device 50 determines that there is no possibility that the absorption liquid in the high temperature regenerator 5 or the second intermediate absorption liquid pipe 23 is crystallized. Then, the three-way valve 28 is fully closed, and the process returns to step S21 (step S27). As a result, the control of the three-way valve 28 is returned to the normal processing, so that the exhaust heat of a heat source generator (not shown) can be used effectively.

  Thus, in the third crystal avoidance process, since the three-way valve 28 is controlled according to the temperature measured by the temperature sensors 62 to 64, there is no need to provide a pressure sensor for detecting the pressure in the high temperature regenerator 5. Cost increase due to execution of the third crystal avoidance process can be suppressed. Further, since the concentrated intermediate absorbent concentration X is calculated using the temperature sensors 62 and 63, it is not necessary to provide an expensive concentration meter for detecting the concentration of the concentrated intermediate absorbent, and therefore the third crystal avoidance process is executed. The cost increase due to can be suppressed.

  As described above, according to the present embodiment, the three-way valve 28 is provided in the low heat source supply pipe 16 that supplies the hot water as the heat source to the low heat source regenerator 9, and the intermediate absorption liquid temperature and the intermediate absorption liquid crystal temperature are provided. Is provided with a control device 50 that fully closes the three-way valve 28 when the difference is less than a predetermined temperature difference, the amount of heating in the high-temperature regenerator 5 is increased and the pressure in the high-temperature regenerator 5 is increased. Since the intermediate absorption liquid flows from the high temperature regenerator 5 to the low temperature regenerator 6 and the liquid level of the high temperature regenerator 5 is lowered, the rare intermediate absorption liquid is supplied to the high temperature regenerator 5, and as a result, the concentrated intermediate absorption liquid is excessively increased. Concentration can be prevented and crystallization of the absorbing solution can be avoided.

Further, according to the present embodiment, the control device 50 is configured such that when the difference between the intermediate absorption liquid temperature and the intermediate absorption liquid crystal temperature exceeds a predetermined temperature difference after the three-way valve 28 is fully closed, the three-way valve When the pressure in the high-temperature regenerator 5 rises to such an extent that the concentrated intermediate absorbent flows from the high-temperature regenerator 5 to the low-temperature regenerator 6 in order to release the full-close of the three-way valve 28, the full-close of the three-way valve 28 is released Therefore, the exhaust heat of the heat source generator can be used effectively.
Note that a densitometer may be disposed in the second intermediate absorbing liquid tube 23, and the concentrated intermediate absorbing liquid concentration X may be detected by this densitometer.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above-described embodiment, the absorption chiller / heater 100 has been described as performing one crystal avoidance process among the first to third crystal avoidance processes, but a plurality of crystal avoidance processes are performed simultaneously. It may be configured. In this case, when the control device 50 determines to fully close the three-way valve 28 in one crystal avoidance process, the control device 50 forcibly fully closes the three-way valve 28 and fully closes the three-way valve 28 in all process crystal avoidance processes. When it is determined to cancel, the three-way valve 28 is fully closed.

  Moreover, although the said embodiment demonstrated the structure provided with the gas burner 4 which burns and burns fuel gas as a heating means which heats absorption liquid in the high temperature regenerator 5, it is not restricted to this, Kerosene or It is good also as a structure provided with the burner which burns A heavy oil, or the structure heated using warm heat, such as a vapor | steam and exhaust gas.

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 4 Gas burner (heating means)
5 High temperature regenerator 6 Low temperature regenerator 7 Condenser 9 Low heat source regenerator 16 Low heat source supply pipe 28 Three-way valve (hot water control valve)
50 Control device (warm water control means)
52 Timekeeping means 61-64 Temperature sensor 100, 200, 300 Absorption chiller / heater (absorption chiller)

Claims (6)

A low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser, and an absorber are provided and connected to each other to form a circulation path for absorbing liquid and refrigerant, and supplied to the low heat source regenerator. The single-effect operation for heating the absorbing liquid using the heated water as a heat source and the single double-effect operation or the double-effect operation for heating the absorbing liquid using the heating means provided in the high-temperature regenerator as a heat source. In absorption refrigerators,
A hot water control valve is provided in a low heat source supply pipe for supplying hot water as a heat source to the low heat source regenerator, and when the temperature of the high temperature regenerator is equal to or lower than a predetermined temperature, the number of times the heating means is operated is measured. An absorption chiller comprising a hot water control means for fully closing the hot water control valve when the number of times of measurement reaches a predetermined number.   The hot water control means releases the full closure of the hot water control valve when the temperature of the high temperature regenerator becomes a predetermined temperature or higher after the hot water control valve is fully closed. Absorption type refrigerator as described in 1. A low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser, and an absorber are provided and connected to each other to form a circulation path for absorbing liquid and refrigerant, and supplied to the low heat source regenerator. The single-effect operation for heating the absorbing liquid using the heated water as a heat source and the single double-effect operation or the double-effect operation for heating the absorbing liquid using the heating means provided in the high-temperature regenerator as a heat source. In absorption refrigerators,
A hot water control valve is provided in a low heat source supply pipe for supplying hot water as a heat source to the low heat source regenerator, and when the heating time of the high temperature regenerator is a predetermined time or less, the number of times the heating means is operated is measured, An absorption chiller comprising a hot water control means for fully closing the hot water control valve when the number of times of measurement reaches a predetermined number.   The hot water control means releases the full closure of the hot water control valve when heating occurs in which the heating time of the high temperature regenerator exceeds a predetermined time after the hot water control valve is fully closed. The absorption refrigerator according to claim 3. A low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser, and an absorber are provided and connected to each other to form a circulation path for absorbing liquid and refrigerant, and supplied to the low heat source regenerator. The single-effect operation for heating the absorbing liquid using the heated water as a heat source and the single double-effect operation or the double-effect operation for heating the absorbing liquid using the heating means provided in the high-temperature regenerator as a heat source. In absorption refrigerators,
A hot water control valve is provided in a low heat source supply pipe for supplying hot water as a heat source to the low heat source regenerator, and when the difference between the intermediate absorbent temperature and the intermediate absorbent crystal temperature is below a predetermined temperature difference, the hot water control is performed. An absorption refrigerator comprising a hot water control means for fully closing the valve.   The hot water control means releases the full closure of the hot water control valve when the difference between the intermediate absorption liquid temperature and the intermediate absorption liquid crystal temperature exceeds a predetermined temperature difference after the hot water control valve is fully closed. The absorption refrigerator according to claim 5.

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