JP6653444B2 - Absorption refrigerator - Google Patents

Description

  The present invention relates to an absorption refrigerator, and more particularly, to an absorption refrigerator capable of accurately determining a decrease in heat exchange efficiency in a condenser.

2. Description of the Related Art In general, an absorption refrigerator including a high-temperature regenerator, a low-temperature regenerator, an evaporator, a condenser, and an absorber, which are connected to each other to form a circulation path for an absorbent and a refrigerant, is known. Absorption refrigerators are used, for example, for central air conditioning in office buildings.
In such an absorption refrigerator, non-condensable gases such as hydrogen gas, oxygen gas, and nitrogen gas may accumulate inside the condenser or the absorber. When such non-condensable gas accumulates, there is a problem that the heat exchange efficiency in the condenser or the absorber deteriorates.

  Therefore, conventionally, for example, a technology in which an absorber is provided with a bleeding device that extracts non-condensable gas such as hydrogen gas, oxygen gas, and nitrogen gas that is generated internally or enters from the outside and discharges the gas to the outside. Is disclosed (for example, refer to Patent Document 1).

JP 2006-125755 A

By the way, in general, when the inside of the cooling water pipe in the condenser is generated, the heat exchange efficiency between the cooling water and the condensed refrigerant in the condenser is reduced. For this reason, conventionally, when the temperature difference between the cooling water and the condensed refrigerant becomes equal to or higher than a predetermined temperature, it is determined that the heat exchange efficiency has decreased, and a prediction that the cooling water pipe is contaminated has been issued. Information was being done.
However, even when the non-condensable gas stays inside the condenser, a temperature difference may similarly occur.
For this reason, even though the cooling water pipe is originally free of dirt, the forecast of the contamination of the cooling water pipe is issued due to the stay of the non-condensable gas, and the maintenance technician cleans the cooling water pipe. There was an inconvenience.
In order to solve such inconvenience, it has been desired to accurately determine whether the heat exchange efficiency is reduced due to the stay of the non-condensable gas or the heat exchange efficiency is reduced due to contamination of the cooling water pipe.

  The present invention has been made in view of the above circumstances, and has as its object to provide an absorption refrigerator capable of accurately determining whether a decrease in heat exchange efficiency is caused by the stay of non-condensable gas. It is assumed that.

In order to achieve the above object, the present invention provides an absorption apparatus comprising a high-temperature regenerator, a low-temperature regenerator, an evaporator, a condenser, and an absorber, which are connected to each other to form a circulation path for the absorption liquid and the refrigerant. In the type refrigerator, when it is determined that the state in which the temperature difference between the diluted absorbing liquid outlet temperature and the cooling water inlet temperature is equal to or higher than the predetermined temperature has continued for a predetermined time, and, the refrigerant condensing temperature, the cooling water outlet temperature, When it is determined that the state in which the temperature difference has become equal to or greater than the predetermined temperature difference has continued for a predetermined time , the control unit controls the notification unit to issue a preliminary notification that the bleeding performance is insufficient. It is characterized by the following.

  In the above configuration, the control device performs control so as to issue a forecast report when a design temperature difference between the diluted absorbent outlet temperature and the cooling water inlet temperature is equal to or more than + 2 ° C.

  According to the present invention, it is possible to reliably recognize that the heat exchange efficiency is reduced due to the stay of the non-condensable gas. As a result, it is possible to distinguish a decrease in heat exchange efficiency due to contamination of the cooling water pipe, and to perform appropriate maintenance.

It is a schematic structure figure of an absorption refrigerator concerning this embodiment. FIG. 3 is a block diagram illustrating a control configuration according to the embodiment. 5 is a flowchart illustrating the operation of the embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an absorption refrigerator according to the present embodiment. The absorption refrigerator 100 uses water as a refrigerant and an aqueous solution of lithium bromide (LiBr) as an absorption liquid, and generates the absorption liquid using a heat source generator (for example, a solar water heater or a cogeneration apparatus). It is an exhaust heat recovery type (so-called Genelink) absorption chiller / heater equipped with a waste heat regenerator that heats with hot water at a low temperature (for example, about 80 ° C.).

As shown in FIG. 1, the absorption refrigerator 100 includes an evaporator 1, an absorber 2 arranged in parallel with the evaporator 1, and an evaporator absorber body 3 containing the evaporator 1 and the absorber 2. And a high-temperature regenerator 5 having a gas burner (heating means) 4, a low-temperature regenerator 6, a condenser 7 juxtaposed to the low-temperature regenerator 6, and the low-temperature regenerator 6 and the condenser 7 housed therein. And a low temperature regenerator condenser body 8.
The absorption refrigerator 100 includes a low-temperature heat exchanger 12, a high-temperature heat exchanger 13, a refrigerant drain heat recovery unit 17, a rare absorbent pump 45, a concentrated absorbent pump 47, and a refrigerant pump 48. Each of these devices is connected to the piping via the absorption liquid pipes 21 to 25 and the refrigerant pipes 31 to 35 to form a circulation path.

The evaporator 1 is provided with a chilled water pipe 14 for circulating and supplying the brine that has exchanged heat with the refrigerant in the evaporator 1 to a heat load (for example, an air conditioner) (not shown). A partially formed heat transfer tube 14 </ b> A is arranged in the evaporator 1.
The absorber 2 and the condenser 7 are provided with cooling water pipes 15 for sequentially flowing cooling water through the absorber 2 and the condenser 7, and each heat transfer pipe 15A formed in a part of the cooling water pipe 15 is provided. , 15B are disposed in the absorber 2 and the condenser 7, respectively.

The absorber 2 has a function of absorbing the refrigerant vapor evaporated by the evaporator 1 into an absorbing liquid and keeping the pressure in the evaporator absorber body 3 in a high vacuum state. In the lower part of the absorber 2, there is formed a dilute absorbing liquid reservoir 2A for storing the dilute absorbing liquid diluted by absorbing the refrigerant vapor. The dilute absorbing liquid reservoir 2A has a dilute absorbing liquid pump 45 having a dilute absorbing liquid pump 45. One end of the liquid pipe 21 is connected. The rare absorbing liquid pipe 21 includes a branched rare absorbing liquid pipe 21A that branches on the downstream side of the rare absorbing liquid pump 45.
After passing through the refrigerant drain heat recovery unit 17, the branched diluted absorption liquid pipe 21 </ b> A joins the diluted absorption liquid pipe 21 again on the downstream side of the low-temperature heat exchanger 12 of the diluted absorption liquid pipe 21. The other end of the diluted absorption liquid pipe 21 passes through the high-temperature heat exchanger 13 and opens to the gas layer 5B located above the heat exchange section 5A formed in the high-temperature regenerator 5.
The diluted absorption liquid pipe 21 is branched into a second branch pipe 21B on the downstream side of the low-temperature heat exchanger 12, and the second branch pipe 21B is opened in the low-temperature regenerator 6.

  The high-temperature regenerator 5 is configured by housing the gas burner 4 in a shell 60, and above the gas burner 4 is formed a heat exchange section 5A for heating and regenerating the absorbent using the flame of the gas burner 4 as a heat source. An exhaust path 40 through which exhaust gas burned by the gas burner 4 flows is connected to the heat exchange section 5A, and an exhaust gas heat exchanger 41 is provided in the exhaust path 40. The gas burner 4 is connected to a gas pipe 61 to which a fuel gas is supplied and an intake pipe 63 to which air from a blower 62 is supplied. The gas pipe 61 and the intake pipe 63 have fuel gas and air Is provided with a control valve 64 for controlling the amount of.

On the side of the heat exchange section 5A, there is formed an intermediate absorption liquid reservoir 5C in which the intermediate absorption liquid flowing out of the heat exchange section 5A after being heated and regenerated in the heat exchange section 5A is retained. One end of a second intermediate absorption liquid pipe 23 is connected to a lower end of the intermediate absorption liquid reservoir 5C, and the second intermediate absorption liquid pipe 23 is provided with a high-temperature heat exchanger 13. 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 of the intermediate absorption liquid reservoir 5C. The aim is to reduce fuel consumption.
The other end of the second intermediate absorbent pipe 23 is connected to a concentrated absorbent pipe 25 connecting the low temperature regenerator 6 and the absorber 2. Further, the upstream side of the high-temperature heat exchanger 13 of the second intermediate absorbent pipe 23 and the absorber 2 are connected by an absorbent pipe 24 in which an on-off valve V1 is interposed.

The low-temperature regenerator 6 heats and regenerates the absorbent stored in the absorbent reservoir 6A formed in the low-temperature regenerator 6 using the refrigerant vapor separated by the high-temperature regenerator 5 as a heat source. A heat transfer tube 31 </ b> A formed at a part of the refrigerant tube 31 extending from the upper end of the high-temperature regenerator 5 to the bottom of the low-temperature regenerator 6 is disposed in the first heat exchanger 5. By flowing the refrigerant vapor through the refrigerant pipe 31, the heat of the refrigerant vapor is transmitted to the absorbent stored in the absorbent reservoir 6A via the heat transfer tube 31A, and the absorbent is further concentrated.
One end of a concentrated absorption liquid pipe 25 is connected to the absorption liquid reservoir 6A of the low-temperature regenerator 6, and the other end of the concentrated absorption liquid pipe 25 is connected to a concentrated liquid sprayer provided above the gas layer 2B of the absorber 2. 2C. The concentrated absorption liquid pipe 25 is provided with a concentrated absorption liquid pump 47 and a low-temperature heat exchanger 12. The low-temperature heat exchanger 12 heats the rare absorbing liquid flowing through the rare absorbing liquid pipe 21 by the heat of the concentrated absorbing liquid flowing out of the absorbing liquid reservoir 6B of the low-temperature regenerator 6.

The concentrated absorption liquid pipe 25 is provided with a bypass pipe 27 that bypasses the concentrated absorption liquid pump 47 and the low-temperature heat exchanger 12.
When the operation of the concentrated absorbent pump 47 is stopped, the absorbent stored in the absorbent reservoir 6A of the low-temperature regenerator 6 is supplied into the absorber 2 through the concentrated absorbent pipe 25 and the bypass pipe 27.

As described above, the gas layer portion 5B of the high temperature regenerator 5 and the refrigerant liquid reservoir 7A formed at the bottom of the condenser 7 are connected by the refrigerant pipe 31. The refrigerant pipe 31 includes a heat transfer pipe 31A and a refrigerant drain heat recovery unit 17 that are piped to the absorption liquid reservoir 6A of the low-temperature regenerator 6, and an upstream side of the heat transfer pipe 31A of the refrigerant pipe 31 and a gas layer of the absorber 2. The part 2B is connected to the refrigerant pipe 32 via the on-off valve V2.
Further, one end of a refrigerant pipe 34 through which the refrigerant flowing out of the refrigerant liquid pool 7A flows is connected to the refrigerant liquid pool 7A of the condenser 7, and the other end of the refrigerant pipe 34 has a U-shaped seal portion 34A curved downward. Is connected to the gas layer part 1A of the evaporator 1 via the
Below the evaporator 1, there is formed a refrigerant liquid reservoir 1B in which the liquefied refrigerant accumulates, and a refrigerant pump 48 is provided between the refrigerant liquid reservoir 1B and the sprayer 1C disposed above the gas layer 1A of the evaporator 1. It is connected by a refrigerant pipe 35 interposed.

  Further, the cooling water pipe 15 is provided with a cooling water inlet temperature sensor 36 for detecting the temperature of the inlet side of the cooling water flowing through the cooling water pipe 15 and a cooling water outlet temperature sensor 37 for detecting the temperature of the outlet side of the cooling water. I have. The diluted absorbing liquid pipe 21 at the outlet side of the absorber 2 is provided with a diluted absorbing liquid outlet temperature sensor 38 for detecting the temperature of the absorbing liquid. Is provided.

Further, the absorption refrigerator 100 of the present embodiment includes the bleed device 70, and the bleed device 70 includes the tank 51. The bleed pipe 52 communicating with the gas layer 2B of the absorber 2 is connected to the upper part of the tank 71. A return pipe 73 communicating below the absorber 2 is connected to the bottom of the tank 71. Further, an upper part of the tank 71 is connected to an absorbent pipe 75 connected to the diluted absorbent pipe 21 via an ejector pump 74.
Then, by driving the ejector pump 74, the diluted absorption liquid in the diluted absorption pipe 21 is taken into the tank 71 via the absorption liquid pipe 75. Due to the diluted absorbing liquid flowing through the absorbing liquid pipe 75, the inside of the tank 71 becomes a negative pressure, whereby not only non-condensable gas stored in the upper part of the absorber 2 but also refrigerant vapor, vaporized absorbing liquid and the like are extracted. It is guided above the tank 51 through the trachea 72.

  Among the gas guided to the tank 71, the refrigerant vapor and the vaporized absorbing liquid are dissolved and absorbed in the absorbing liquid stored below the tank 71, but the non-condensable gas cannot be dissolved in the absorbing liquid. It is stored above the tank 71. Then, the absorbing liquid accumulated below the tank 71 is returned to the absorber 3 through the return pipe 73.

Next, a control configuration of the present embodiment will be described.
FIG. 2 is a block diagram illustrating a control configuration according to the present embodiment.
As shown in FIG. 2, the absorption refrigerator 100 of the present embodiment includes a controller 50, and the controller 50 includes a control device 51. The control device 51 centrally controls each unit of the absorption refrigerator 100, and includes a CPU as an arithmetic execution unit, a ROM that stores a basic control program executable by the CPU, predetermined data, and the like in a nonvolatile manner. , A memory 52 such as a RAM, and other peripheral circuits.
Further, the control device 51 is configured to receive detection signals from the cooling water inlet temperature sensor 36, the cooling water outlet temperature sensor 37, the diluted absorbent outlet temperature sensor 38, and the condensed refrigerant temperature sensor 39, respectively.
Further, the controller 50 includes a timer 53, an operation unit 54, and a notification unit 55.

  The control device 51 of the controller 50 controls the fuel control valve 64 of the gas burner 4 of the absorption refrigerator 100 to control the combustion by the gas burner 4, and also controls the rare absorption liquid pump 45, the intermediate absorption liquid pump 46, and the concentrated absorption liquid. The drive control of the liquid pump 47 and the refrigerant pump 48 is performed. Further, the control device 51 of the controller 50 performs inverter control of the rare absorbing liquid pump 45, the intermediate absorbing liquid pump 46, the concentrated absorbing liquid pump 47, and the refrigerant pump 48, so that the rare absorbing liquid pump 45, the intermediate absorbing liquid pump 46 The flow rate is controlled by the concentrated absorption liquid pump 47 and the refrigerant pump 48. The control device 51 is configured to control the opening and closing of each valve 28, V1, and V2.

In the present embodiment, the control device 51 acquires the diluted absorbent outlet temperature T1 and the cooled water inlet temperature T2 detected by the diluted absorbent outlet temperature sensor 38 and the coolant inlet temperature sensor 36, and obtains the diluted absorbent outlet temperature. It is determined whether or not T1-cooling water inlet temperature T2 ≧ predetermined temperature difference T3. Then, the control device 51 determines whether or not the state in which the diluted absorbent outlet temperature T1-the cooling water inlet temperature T2 is equal to or more than the predetermined temperature difference T3 has continued for a predetermined time (for example, 30 minutes) (first operation). conditions).
Generally, the temperature difference between the diluted absorbing liquid outlet temperature T1 and the cooling water inlet temperature T2 is designed to be about 5 ° C., and + 2 ° C. with respect to the designed temperature difference, that is, the predetermined temperature difference T3 It is determined whether the temperature has reached 7 ° C. or higher.

The controller 51 acquires the refrigerant condensing temperature T4 and the cooling water outlet temperature T5 detected by the cooling water outlet temperature sensor 37 and the condensing refrigerant temperature sensor 39, and calculates the refrigerant condensing temperature T4−the cooling water outlet temperature T5 ≧ the predetermined temperature difference. It is determined whether or not T6 has been reached. Then, the control device 51 determines whether or not the state in which the refrigerant condensing temperature T4−the cooling water outlet temperature T5 becomes equal to or higher than the predetermined temperature difference T6 has continued for a predetermined time (for example, 30 minutes) (second condition). .
Generally, when the temperature difference between the refrigerant condensing temperature T4 and the cooling water outlet temperature T5 is equal to or more than a certain value, the non-condensable gas stays inside the condenser, and it is considered that the heat exchange efficiency is reduced. For example, the predetermined temperature difference T6 is set to 5 ° C.

If the control device 51 determines that the above-described first condition is satisfied, or determines that both the first condition and the second condition are satisfied, the control unit 51 uses the notification unit 55 to indicate that the bleeding performance is insufficient. It is configured to give a forecast report to the effect.
In the present embodiment, the notification is issued by the notification unit 55 of the controller 50. However, for example, the notification is issued by an external system such as a service management company which can communicate with the controller 50 by wire or wirelessly. Information may be issued.

Next, the operation of the present embodiment will be described.
During a cooling operation such as cooling, brine (for example, cold water) is circulated through a cold water pipe 14 to a heat load (not shown). The controller 51 controls the amount of heat input to the absorption refrigerator 100 so that the outlet temperature of the brine evaporator 1 (the temperature detected by the chilled water outlet temperature sensor 36) becomes a predetermined set temperature, for example, 7 ° C. Is controlled.
Specifically, the control device 51 activates all the pumps 45, 47, and 48 and controls the gas combustion in the gas burner 4, so that the brine temperature measured by the chilled water outlet temperature sensor 36 becomes a predetermined temperature. The heating power of the gas burner 4 is controlled so as to be 7 ° C.

In this case, the rare absorbing liquid from the absorber 2 is heated by the rare absorbing liquid pump 45 via the low-temperature heat exchanger 12, the high-temperature heat exchanger 13, or the exhaust gas heat exchanger 41 via the rare absorbing liquid pipe 21. It is sent to the high temperature regenerator 5.
The absorbing liquid sent to the high-temperature regenerator 5 is heated by the flame of the gas burner 4 and the high-temperature combustion gas in the high-temperature regenerator 5, so that the refrigerant in the absorbing liquid evaporates and separates. The intermediate absorption liquid whose concentration has increased by evaporating and separating the refrigerant in the high-temperature regenerator 5 is sent to the concentrated absorption liquid pipe 25 via the high-temperature heat exchanger 13 and merges with the absorption liquid via the low-temperature regenerator 6. .

  On the other hand, the absorbing liquid sent to the low-temperature regenerator 6 is heated 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 further the refrigerant is separated and the concentration is reduced. The concentration becomes higher, and this concentrated absorbent merges with the above-mentioned absorbent passed through the high-temperature regenerator 5 and is sent to the absorber 2 via the low-temperature heat exchanger 12 by the concentrated absorbent pump 47, and the concentrated liquid sprayer 2C Sprayed from.

The refrigerant separated and generated by the low-temperature regenerator 6 enters the condenser 7 and is condensed and stored in the refrigerant liquid reservoir 7A. When a large amount of the refrigerant liquid is accumulated in the refrigerant liquid reservoir 7A, the refrigerant liquid flows out of the refrigerant liquid reservoir 7A, enters the evaporator 1 via the refrigerant pipe 34, and is pumped and dispersed by the operation of the refrigerant pump 48. Sprayed from the vessel 1C onto the heat transfer tube 14A of the cold water tube 14.
The refrigerant liquid sprinkled on the heat transfer tube 14A evaporates by taking heat of vaporization 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. Cooling operation such as cooling is performed by supplying the heat load from the cold water pipe 14 to the heat load.
The refrigerant evaporated by the evaporator 1 enters the absorber 2 and is absorbed by the concentrated absorbent supplied from the low-temperature regenerator 6 and scattered from above. The circulation transported to the high-temperature regenerator 5 by the absorbent pump 45 is repeated.

Next, the control according to the present embodiment will be described with reference to the flowchart shown in FIG.
In the present embodiment, the control device 51 determines the diluted absorbent outlet temperature based on the diluted absorbent outlet temperature T1 and the cooled water inlet temperature T2 detected by the diluted absorbent outlet temperature sensor 38 and the coolant inlet temperature sensor 36. It is determined whether or not the state of T1-cooling water inlet temperature T2 ≧ predetermined temperature difference T3 has continued for a predetermined time (for example, 30 minutes) (ST1).

  If the control device 51 determines that the state of the dilute absorbent outlet temperature T1−the cooling water inlet temperature T2 ≧ the predetermined temperature difference T3 has continued for the predetermined time, the control device 51 performs the cooling water outlet temperature sensor 37. , And the refrigerant condensing temperature T4 and the cooling water outlet temperature T5 detected by the condensing refrigerant temperature sensor 39, and the state where the refrigerant condensing temperature T4−the cooling water outlet temperature T5 ≧ the predetermined temperature difference T6 is satisfied for a predetermined time (for example, It is determined whether or not it is continued (30 minutes) (ST2).

  If the controller 51 determines that the state where the refrigerant condensing temperature T4−the cooling water outlet temperature T5 ≧ the predetermined temperature difference T6 has continued for the predetermined time (ST2: YES), the notification unit 55 performs the bleeding. Control is performed so as to issue a warning that the performance is insufficient (ST3).

  By issuing the forecast notification in this manner, a technician who performs maintenance on the absorption chiller 100 can be made aware that the bleeding performance is insufficient. It is possible to clearly distinguish the decrease in heat exchange efficiency from the decrease in heat exchange efficiency.

As described above, in the present embodiment, when it is determined that the state in which the temperature difference between the diluted absorbing liquid outlet temperature and the cooling water inlet temperature has exceeded the predetermined temperature has continued for the predetermined time, the notification unit 55 And a control device 51 for performing control so as to issue a warning indicating that the bleeding performance is insufficient.
According to this, it is possible to reliably recognize that the heat exchange efficiency is reduced due to the stay of the non-condensable gas. As a result, it is possible to distinguish a decrease in the heat exchange efficiency due to the contamination of the cooling water pipe 15, and to perform appropriate maintenance.

Further, in the present embodiment, when the control device 51 determines that the state in which the temperature difference between the refrigerant condensing temperature and the cooling water outlet temperature has become equal to or greater than the predetermined temperature difference has continued for a predetermined time, the notification unit 55 Then, control is performed so as to issue a warning that the bleeding performance is insufficient.
According to this, it is possible to more reliably recognize that the heat exchange efficiency is reduced due to the stay of the non-condensable gas. As a result, it is possible to distinguish a decrease in the heat exchange efficiency due to the contamination of the cooling water pipe 15, and to perform appropriate maintenance.

In the present embodiment, the control device 51 performs control so as to issue a forecast report when the designed temperature difference between the diluted absorbent outlet temperature and the cooling water inlet temperature is equal to or more than + 2 ° C.
According to this, when the temperature difference between the outlet temperature of the diluted absorbent and the inlet temperature of the cooling water becomes equal to or more than + 2 ° C. in the design, the forecast is issued, so the heat exchange efficiency due to the stay of the non-condensable gas is reduced. Decrease can be determined.

Note that the present embodiment is an example to which the present invention is applied, and the present invention is not limited to the above-described embodiment.
For example, in the present embodiment, the configuration in which the gas burner 4 that burns and heats the fuel gas as the heating unit that heats the absorbent in the high-temperature regenerator is described. However, the configuration is not limited thereto. A configuration including a gas burner for burning kerosene or A-heavy oil, or a configuration in which heating is performed using heat such as steam or exhaust gas may be employed.

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 4 Gas burner (heating means)
Reference Signs List 5 high temperature regenerator 6 low temperature regenerator 7 condenser 12 low temperature heat exchanger 13 high temperature heat exchanger 14 cold water pipe 15 cooling water pipe 16 waste water supply pipe 21 rare absorption liquid pipe 36 cooling water inlet temperature sensor 37 cooling water outlet temperature sensor 38 Rare absorbent outlet temperature sensor 39 Condensed refrigerant temperature sensor 45 Rare absorbent pump 47 Concentrated absorbent pump 48 Refrigerant pump 50 Controller 51 Controller 52 Memory 53 Timer 55 Notification unit 70 Bleeding device 100 Absorption refrigerator

Claims (2)

In an absorption refrigerator including a high-temperature regenerator, a low-temperature regenerator, an evaporator, a condenser and an absorber, which are connected to each other by piping to form a circulation path for the absorption liquid and the refrigerant,
When it is determined that the state in which the temperature difference between the diluted absorbent outlet temperature and the cooling water inlet temperature has exceeded the predetermined temperature has continued for a predetermined time, and the temperature difference between the refrigerant condensing temperature and the cooling water outlet temperature has been set to a predetermined value. When it is determined that the state in which the temperature difference or more has been maintained for a predetermined time , the control unit controls the notification unit to issue a warning indicating that the bleeding performance is insufficient. Absorption refrigerator. 2. The control device according to claim 1, wherein the control device is configured to perform a forecast notification when a design temperature difference between the diluted absorbent outlet temperature and the cooling water inlet temperature becomes equal to or more than + 2 ° C. 3. Absorption refrigerator.

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