JPH05157416A - Detecting device for abnormality of absorption refrigerating machine - Google Patents

Abstract

PURPOSE:To detect abnormality in an absorption device even when an absorption refrigerating machine is under partial load and carry out maintenance and inspection work in an early stage. CONSTITUTION:Cold water temperature sensors 36, 37 are provided which detect respectively the temperature at the cold water inlet and the temperature at the cold water outlet of an evaporator 1, and an absorption liquid outlet temperature sensor 38 that detects the absorption liquid outlet temperature of an absorption device 2, absorption liquid inlet temperature sensor 39 that detects the absorption liquid inlet temperature of the absorption device 2, cooling water inlet temperature sensor 40 and cooling water outlet temperature sensor 41 that respectively detect the cooling water inlet temperature and outlet temperature of the absorption device 2 are provided. From the difference of detected temperatures of respective cold water temperature sensor and the difference of temperatures at the cold water outlet and inlet under 100% load the cold water load is calculated, and an actual logarithmic average temperature difference of the absorption device 2 is calculated from the detected temperatures by respective temperature sensors. An abnormality detection device 42 is provided that outputs abnormality signal by comparing the actual logarithmic average temperature difference and the cold water load. It is possible to detect abnormality of the absorption device 2 and carry out maintenance and inspection in an early stage even when the absorption refrigerating machine is under partial load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating machine, and more particularly to an abnormality detecting device for an absorption refrigerating machine which detects an abnormality in an absorber.

[0002]

2. Description of the Related Art For example, in Japanese Unexamined Patent Publication No. 1-142374, a temperature detector and a pressure detector are installed in an internal space of an evaporator, and output signals from the respective detectors are input, and these signals are predetermined. Disclosed is a refrigerator protection device that includes a setting device that outputs a refrigerator stop signal and an alarm signal when a value is reached.

[0003]

In the above-mentioned conventional technique, the refrigerator is, for example, an absorption refrigerator, and when detecting an abnormality of, for example, an absorber other than the evaporator, the absorber is generally used in the same manner as the evaporator. A pressure detector is provided to detect a pressure increase when an abnormality occurs, and is compared with a design value when INPUT is 100%. Therefore, when the absorption type refrigerator is partially loaded in spring or autumn other than summer or when there is almost no load, the abnormality of the absorber cannot be accurately detected, which causes a problem that the detection of the abnormality of the refrigerator is delayed.

[0004]

In order to solve the above-mentioned problems, the present invention provides an absorption refrigerating machine in which a high temperature regenerator 4, a condenser 7, an evaporator 1 and an absorber 2 are connected by piping. Cold water temperature detectors 36 and 37 for detecting the cold water inlet temperature and outlet temperature of the evaporator 1, cooling water temperature detectors 40 and 41 for detecting the cooling water inlet and outlet temperatures of the absorber 2, respectively, and the absorber 2 An absorption liquid outlet temperature detector 38 for detecting the temperature of the outlet side absorption liquid, and an absorption liquid inlet temperature detector 39 for detecting the temperature of the absorption liquid sprayed on the absorber 2.
100% difference between the detected temperatures of the cold water temperature detectors 36 and 37
The chilled water load is calculated from the chilled water inlet / outlet temperature difference at the time of load, and the absorber 2 temperature is detected based on the detected temperatures of the cooling water temperature detectors 40, 41, the absorption liquid outlet temperature detector 38, and the absorption liquid inlet temperature detector 39. An abnormality detector 42 that calculates an actual logarithmic average temperature difference and compares the actual logarithmic average temperature difference with a cold water load and outputs an abnormal signal is provided. An abnormality detection device for surely detecting an abnormality is provided.

Further, a concentrated liquid temperature detector 53 for detecting the temperature of the absorbing liquid on the outlet side of the low temperature regenerator 6, a condensing temperature detector 54 for detecting the condensing temperature of the condenser 7, and a cold water inlet temperature of the evaporator 1 And cold water temperature detector 3 for detecting the outlet temperature
6, 37, an absorption liquid outlet temperature detector 38 that detects the temperature of the absorption liquid on the outlet side of the absorber 2, a pressure detector 52 that detects the pressure in the absorber 2, and a concentrated liquid temperature detector 53. The concentration of the concentrated liquid sprayed on the absorber 2 is calculated from the temperature of the concentrated absorbing liquid and the condensation temperature detected by the condensation temperature detector 54, and the concentration is calculated from the concentration of the concentrated liquid and the pressure detected by the pressure detector 52. The temperature of the concentrated absorbent that is sprayed to the container 2 is calculated, and the temperature of this concentrated absorbent, the temperature of the absorbent on the outlet side of the absorber 2, and the cooling water temperature detector 4
The actual logarithmic average temperature difference of the absorber 2 is calculated from the cooling water inlet / outlet temperatures detected by 0 and 41, and the difference between the detected temperatures of the respective cold water temperature detectors 36 and 37 and the difference between the cooling water inlet / outlet temperatures at 100% load. It is equipped with an anomaly detector that calculates the chilled water load from, and outputs an anomaly signal by comparing the ideal logarithmic mean temperature difference and the actual logarithmic mean temperature difference for this chilled water load, even when the absorption chiller is partially loaded. An abnormality detection device for surely detecting an abnormality of the absorber 2 before the cold water temperature changes due to the abnormality.

Cold water temperature detectors for detecting the cold water inlet temperature and outlet temperature of the evaporator 1, a refrigerant temperature detector for detecting the refrigerant temperature on the refrigerant liquid suction side of the refrigerant pump, and a cold water when the absorber 2 is healthy The relationship between the load and the ideal logarithmic average temperature difference is stored, and the cold water load is calculated from the difference between the detected temperatures of the cold water temperature detectors 36 and 37 and the difference between the cold water inlet and outlet temperatures at 100% load. The ideal logarithmic average temperature difference corresponding to the cold water load, the ideal logarithmic average temperature difference corresponding to this cold water load is obtained from the relationship between the cold water load and the ideal logarithmic average temperature difference, and each cold water temperature detector 63, Three
7. The actual logarithmic average temperature difference of the absorber 2 is calculated from the temperatures detected by the absorbent liquid outlet temperature detector 38, the absorbent liquid inlet temperature detector 39, and the cooling water temperature detectors 40 and 41, and the actual logarithmic average temperature difference is calculated. And the ideal logarithmic average temperature difference are compared, and the ratio of the actual logarithmic average temperature difference to the ideal logarithmic average temperature difference is equal to or greater than a predetermined value, an anomaly detector that outputs an anomaly signal is provided. The present invention provides an abnormality detection device that accurately distinguishes a change in the absorption refrigerating machine from a change due to an abnormality even when the absorption refrigerator has a partial load.

[0007]

During the operation of the absorption refrigerator, the abnormality detector 42 includes the cold water temperature detectors 36 and 37, the absorption liquid outlet temperature detector 38, the absorption liquid inlet temperature detector 39, and the cooling water temperature detectors 40 and 4.
The temperature signal is input from 1, and the load is calculated from the chilled water inlet / outlet temperature difference at 100% load and the actual chilled water inlet / outlet temperature difference, and the actual logarithmic average temperature difference of the absorber 2 is calculated.
If this logarithmic average temperature difference exceeds the logarithmic average temperature difference abnormal line of the load at that time, the abnormality detector 42 outputs an abnormality signal to notify the abnormality of the absorber 2, so that it is not during summer. An abnormality can be detected even when the absorption refrigerator is partially loaded in spring or the like, and maintenance and inspection work can be performed early for the abnormality of the absorber 2.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows that the refrigerant is, for example, water or an absorbing liquid (solution).
FIG. 1 is a schematic configuration diagram of an absorption chiller-heater, which is an absorption refrigerator using a lithium bromide (LiBr) solution as a solvent.
Reference numeral 2 is an absorber, 3 is an evaporator absorber body (hereinafter, referred to as a lower body) accommodating the evaporator 1 and the absorber 2, 4 is a high temperature regenerator which is equipped with a gas burner 5 and is heated by a high temperature heat source, 6
Is a low temperature regenerator, 7 is a condenser, 8 is a low temperature regenerator condenser cylinder (hereinafter referred to as the upper cylinder) that houses the low temperature regenerator 6 and the condenser 7, 9 is a low temperature heat exchanger, and 10 is a high temperature heat exchanger. 11 to 15 are absorption liquid pipes, 16 is an absorption liquid pump, 17 and 18 are refrigerant pipes, 19 is a refrigerant circulation pipe, 20 is a refrigerant pump, 21 is a gas pipe connected to the gas burner 5, and 22 is a heating amount. The control valve and 23 are cold water pipes provided with an evaporator heat exchanger 24 in the middle thereof, and each pipe is connected as shown in FIG.

Further, 25 is a cooling water pipe, and an absorber heat exchanger 26 and a condenser heat exchanger 27 are provided in the middle of the cooling water pipe 25. Reference numeral 28 is a refrigerant bypass pipe that connects the refrigerant reservoir 29 of the evaporator 1 and the absorbent liquid reservoir 30 of the absorber 2 by pipe, 31 is an on-off valve, and 32 is an absorbent bypass pipe that connects the absorbent pipe 12 and the absorber 2. , 33 is an on-off valve,
34 is a refrigerant vapor bypass pipe connecting the refrigerant pipe 17 and the absorber 2, 35 is an opening / closing valve, and each opening / closing valve 31, 33,
Reference numeral 35 closes when cold water is supplied and opens when hot water is supplied.

Reference numerals 36 and 37 denote first and second temperature detectors, respectively, which are cold water inlet / outlet temperature detectors provided on the inlet side and the outlet side of the evaporator 1 of the cold water pipe 23, and 38 is an absorption liquid pump for the absorption liquid 11. An absorption liquid outlet temperature detector provided on the outlet side of the absorber, 39 is a temperature of the absorption liquid (hereinafter referred to as a concentrated liquid) having a high concentration, which is provided on the absorption liquid pipe 15 on the inlet side of the absorber 2 and is sprayed to the absorber 2. For detecting the absorption liquid inlet temperature, 40 for the cooling water inlet temperature detector for detecting the inlet side cooling water temperature of the absorber 2, and 41 for the cooling water outlet temperature temperature for detecting the outlet side cooling water temperature of the absorber 2. The detector 42 is an abnormality detector for detecting the abnormality detecting device of the absorber 2 by inputting a temperature signal from each of the above temperature detectors. The abnormality detector 42 is, for example, a control panel (not shown) of an absorption refrigerator. No.) and is composed of a micro computer. It has been. Reference numeral 43 is a notification device which is provided on the control panel similarly to the abnormality detector 42 and which operates by receiving a signal from the abnormality detector. This notification device 43
Is composed of a display device 44 having a plurality of segment elements and a buzzer 45, for example. And the display device 4
4 is, for example, ALA based on the signal from the abnormality detector 42.
Blink the letters RM.

The configuration of the abnormality detector 42 will be described below with reference to FIG.
It will be explained based on. 46 is the first and second temperature detectors 3
6, 37, the absorption liquid outlet temperature detector 38, the absorption liquid inlet temperature detector 39, the cooling water inlet temperature detector 40, and the cooling water outlet temperature detector 41, the signals are input and converted into signals, and the central processing unit ( An input interface for outputting to a CPU 47, 48 is a storage device (hereinafter referred to as a ROM) in which an arithmetic program related to the present invention is stored,
49 is an output interface for inputting a signal from the CPU 46 and outputting it to the notification device 41, 50 is a signal generator (hereinafter referred to as CLOCK) for outputting a signal at predetermined time intervals,
Reference numeral 51 denotes a readable and erasable storage device (hereinafter referred to as RAM) that stores the temperature detected by each temperature detector.

In the ROM 48, the cooling water inlet temperature T
1, the actual logarithmic mean temperature difference T of the absorber 2 from the cooling water outlet temperature T2, the absorbing liquid inlet temperature T3, and the absorbing liquid outlet temperature T4.
calculate em

[0013]

[Equation 1]

In the normal operation of the absorption refrigerator, 1
A program for calculating the cold water load from the difference between the cold water inlet temperature and the cold water outlet temperature at the time of 00% load and the difference between the actually detected cold water inlet temperature and the cold water outlet temperature, the cold water load and the absorber shown in FIG. The relationship with the logarithmic average temperature difference is stored.
In FIG. 3, a is an ideal line showing the relationship between the cold water load and the logarithmic average temperature difference when the absorption refrigerator is operating normally, and b is an abnormal line that outputs an abnormal signal.

During the cold water supply operation of the absorption refrigerating machine, the refrigerant evaporated in the high temperature regenerator 4 flows to the condenser 7 via the low temperature regenerator 6 as in the conventional absorption refrigerating machine, and then the condenser heat exchanger. After exchanging heat with the cooling water flowing through 27 to condense and liquefy, it flows to the evaporator 1 through the refrigerant pipe 18. The refrigerant exchanges heat with the water flowing through the evaporator heat exchanger 24 to evaporate, and the water flowing through the evaporator heat exchanger 24 is cooled by the heat of vaporization.
Then, cold water circulates through the load. The refrigerant evaporated in the evaporator 1 is absorbed by the absorbing liquid in the absorber 2. The absorption liquid that has absorbed the refrigerant and becomes thin in concentration is sent to the high temperature regenerator 4 via the low temperature heat exchanger 9 and the high temperature heat exchanger 10 by the operation of the absorption liquid pump 16. The absorption liquid sent to the high temperature regenerator 4 is heated by the burner 5 to evaporate the refrigerant, and the medium concentration absorption liquid flows through the high temperature heat exchanger 10 to the low temperature regenerator 6. In the low temperature regenerator 6, the absorbing liquid is heated by the refrigerant vapor flowing from the high temperature regenerator 10 through the refrigerant pipe 17, and the refrigerant vapor is further separated to have a high concentration. The absorption liquid having a high concentration is sent to the absorber 2 after being lowered in temperature through the low temperature heat exchanger 9 and is sprayed.

Abnormality detection when the absorption refrigerator is operated as described above will be described with reference to the flow chart of FIG. First and second temperature detectors 36 and 37, absorption liquid outlet temperature detector 38, absorption liquid inlet temperature detector 39,
Cooling water inlet temperature detector 40 and cooling water outlet temperature detector 4
Each temperature detected by 1 is the input interface 46 and C.
It is temporarily stored in the RAM 51 via the PU 47. Then, the cold water inlet temperature, the cold water outlet temperature, the absorbing liquid outlet temperature, the absorbing liquid inlet temperature, the cooling water inlet temperature, and the cooling water outlet temperature stored in the RAM 51 are read into the CPU 47 based on the signal from the CLOCK 50. At the same time, the relationship between the equation 1, the program and the cold water load and the logarithmic average temperature difference is read from the ROM 48. Then, the load (%) is calculated from the actual cold water inlet / outlet temperature difference and the cold water inlet / outlet temperature difference (5 ° C.) at 100% load. Here, for example, when the cold water inlet temperature is 10 ° C., the cold water outlet temperature is 7 ° C., and the temperature difference is 3 ° C., the load is 3/5 =
It becomes 0.6 (60%).

Further, in the CPU 47, the absorption liquid outlet temperature,
The actual logarithmic mean temperature difference Tem is calculated from the absorption liquid inlet temperature, the cooling water inlet temperature, the cooling water outlet temperature, and Equation 1 in the above equation. Here, for example, the heat exchange performance in the absorber 2 is deteriorated due to contamination of the absorber heat exchanger 26, and the cooling water inlet temperature is, for example, 32 ° C. and the cooling water outlet temperature is, for example, 34 ° C.
When the absorption liquid inlet temperature is, for example, 54 ° C. and the absorption liquid outlet temperature is, for example, 40 ° C., the actual logarithmic average temperature difference is approximately 13 ° C.
become. Since this logarithmic average temperature difference is higher than the value (10 ° C.) when the load of the abnormal line is 60% shown in FIG. 3, the CPU 47 outputs an abnormal signal via the output interface 49, and the abnormal condition occurs. An abnormal signal is output from the detector 42 to the notification device 43. Then, ALARM is displayed on the display device 44 of the notification device 43, and the buzzer-45 sounds to notify the abnormality of the absorber 2.

Further, when the cold water load is, for example, 60%, the absorption liquid outlet temperature, the absorption liquid inlet temperature, the cooling water inlet temperature and the cooling water outlet temperature and the actual logarithmic mean temperature difference Tem calculated from the above equation 1 are For example, if it is 9.5 ° C and is lower than the value (10 ° C) on the abnormal line when the load is 60%, C
The PU 47 does not output an abnormality signal, and the notification device 43 does not notify the abnormality.

According to the above embodiment, the abnormality detector 42 calculates the actual logarithmic mean temperature difference based on the absorption liquid outlet temperature, the absorption liquid inlet temperature, the cooling water inlet temperature, the cooling water outlet temperature, and the equation 1 above. If an abnormality occurs in the absorber 2 and the logarithmic average temperature difference exceeds the pre-stored abnormality line, the abnormality detector 42 outputs a signal, so that an intermediate period other than summer or winter is calculated. Also, in the case where an abnormality occurs in the absorber 2, it is possible to detect the abnormality at the time of partial load of the absorption chiller-heater and cope with the initial stage of the abnormality. As a result, the maintenance of the absorption chiller-heater The inspection can be performed more reliably.

The second embodiment of the present invention will be described below. It should be noted that the configuration, which is not particularly described, is the same as that of the above-described embodiment, and detailed description thereof will be omitted. 52 is a pressure detector for detecting the pressure in the absorber 2, 53 is the low temperature regenerator 6
A concentrated liquid temperature detector for detecting the temperature of the concentrated liquid on the outlet side, and 54 is a condensation temperature detector for detecting the refrigerant condensation temperature of the condenser 7. In this embodiment, the ROM 46 of the abnormality detector 42
Is a mathematical formula for calculating the concentration of the concentrated liquid on the outlet side of the low temperature regenerator 6 from the concentration of the concentrated liquid on the outlet side of the low temperature regenerator 6 and the condensation temperature of the condenser 7, and the absorption from the concentration of this concentrated liquid and the pressure of the absorber 2. Bowl 2
A program (calculation formula or Dühring diagram) for determining the concentrated liquid spraying temperature is stored. Then, the concentrated liquid dispersion temperature (saturation temperature) of the absorber 2 obtained from the concentrated liquid temperature on the outlet side of the low temperature regenerator 6, the refrigerant condensation temperature of the condenser 7 and the pressure of the absorber 2 is used as the absorbing liquid inlet temperature T3. In place of the above, the actual logarithmic temperature difference of the absorber 2 is calculated by substituting it into the equation 1, and when this value exceeds the abnormal line, the abnormality detection device 42 outputs an abnormal signal.

The absorption liquid inlet temperature is detected by the absorption liquid inlet temperature detector 39 to obtain the actual logarithmic mean temperature difference of the absorber 2 by using the concentrated liquid spraying temperature as in the above embodiment, and the logarithmic mean temperature is detected. The logarithmic average temperature difference can be calculated more accurately than in the case of obtaining the difference, and as a result, the abnormality can be detected more accurately before the change in the cold water temperature due to the abnormality occurs.

Further, as shown in the above embodiment, the absorber 2
The actual logarithmic average temperature difference is calculated, and the ratio of the cold water load to this logarithmic average temperature difference is calculated. For example, the chilled water load is 60%, the actual logarithmic average temperature difference is 8.4 ° C., and the ratio of the load to the logarithmic average temperature difference is 0.14 ° C./%, and this ratio is a predetermined value, for example, 0.12 ° C. Even when the abnormality detection device 42 outputs an abnormality signal when the ratio exceeds /%, the same effect as the above embodiment can be obtained.

Further, the actual logarithmic mean temperature difference of the absorber 2 is calculated based on the cooling water inlet temperature, the cooling water outlet temperature, the absorbing liquid inlet temperature or the concentrated liquid spraying temperature and the absorbing liquid outlet temperature, and the ideal of these values is calculated. Calculate the ratio to the logarithmic mean temperature difference. Then, when this ratio exceeds a predetermined value, the abnormality detector 42 outputs an abnormality signal. For example, when the load is 60%, the actual logarithmic average temperature difference is 10 ° C, and the ideal logarithmic average temperature difference is 8 ° C.
When the temperature is ℃, the ratio is 10/8 = 1.25, and when it is a predetermined value (for example, 1.25) or more, the abnormality detector 42
Outputs an abnormal signal. Further, the actual heat transmission coefficient, which is the reciprocal of the above ratio, is calculated, and this heat transmission coefficient is a predetermined value (for example, 8
Even when the abnormality detector 42 outputs an abnormality signal when it becomes 0% or less, the same effect can be obtained.

In the above embodiment, the description has been given based on the absorption type chiller-heater capable of supplying cold water or hot water, but an absorption chiller supplying only chilled water should also be provided with an abnormality detector as in the above embodiment. As a result, the same operational effect can be obtained.

[0025]

The present invention is an absorption refrigerating machine abnormality detecting device constructed as in the above embodiment, in which the cold water inlet and outlet temperatures of the evaporator are respectively detected by the cold water temperature detectors to cool the absorber. The water inlet and outlet temperatures are respectively detected by the cooling water temperature detector, the absorption liquid temperature on the outlet side of the absorber is detected by the absorption liquid outlet temperature detector, and the temperature of the absorption liquid sprinkled on the absorber is detected by the absorption liquid inlet. Detected by the temperature detector, the abnormality detector calculates the cold water load from the difference in the detected temperature of each cold water temperature detector and the difference in the cold water inlet / outlet temperature at 100% load, and each cooling water temperature detector and absorption liquid The actual logarithmic mean temperature difference of the absorber is calculated from the temperatures detected by the outlet temperature detector and the absorption liquid inlet temperature detector, and an abnormal signal is output by comparing the actual logarithmic mean temperature difference with the cold water load. Absorbed during partial load during the other period It can be detected in the abnormality reliably, As a result, it is possible to avoid a pause in the absorption chiller to implement the maintenance and inspection of the absorption chiller early.

Further, the concentration of the concentrated liquid flowing into the absorber is obtained, the temperature of the concentrated liquid sprayed to the absorber is obtained from this concentration and the pressure inside the absorber, and the cold water inlet / outlet temperature, cooling water inlet / outlet temperature , The actual logarithmic mean temperature difference of the absorber is calculated from the temperature of the absorbent on the outlet side of the absorber and the temperature of the concentrated liquid sprayed on the absorber, and the actual logarithmic mean temperature difference is compared with the cold water load to detect an abnormal signal. By outputting, the abnormality of the absorber can be detected more accurately before the abnormality occurs and the cold water temperature changes.

Further, the abnormality detector stores the relationship between the chilled water load and the ideal logarithmic mean temperature difference when the evaporator is healthy. The chilled water load is calculated and the ideal logarithmic mean temperature difference corresponding to this chilled water load is stored. Is determined from the relationship between the cold water load and the ideal logarithmic mean temperature difference, and is sprayed to the evaporator cold water inlet / outlet temperature, cooling water absorber inlet / outlet temperature, absorbing liquid absorber outlet temperature, and absorber. The actual logarithmic mean temperature difference of the absorber is calculated from the temperature of the concentrated liquid, and the actual logarithmic mean temperature difference is compared with the ideal logarithmic mean temperature difference to determine the ratio of the actual logarithmic mean temperature difference to the ideal logarithmic mean temperature difference. When the value is higher than the value, the abnormal signal can be output to detect the abnormality by surely distinguishing the change of the chilled water temperature due to the load change and the abnormality occurrence.As a result, the maintenance work of the absorption chiller can be performed. More accurate Can.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a block diagram of an anomaly detector.

FIG. 3 is a relationship diagram between a load and a logarithmic average temperature difference.

FIG. 4 is a flowchart for explaining the operation of the abnormality detection device.

[Explanation of symbols]

 1 Evaporator 2 Absorber 4 High temperature regenerator 6 Low temperature regenerator 9 Low temperature heat exchanger 10 High temperature heat exchanger 36 Cold water temperature detector 37 Cold water temperature detector 38 Absorbing liquid outlet temperature detector 39 Absorbing liquid inlet temperature detector 40 Cooling Water inlet temperature detector 41 Cooling water outlet temperature detector 42 Abnormality detector

Claims (3)

[Claims] 1. An absorption refrigerating machine in which a regenerator, a condenser, an evaporator, an absorber and the like are connected by piping, and a cold water temperature detector for respectively detecting a cold water inlet temperature and an outlet temperature of the evaporator, and an absorber. The cooling water temperature detector that detects the cooling water inlet temperature and the cooling water outlet temperature, the absorption liquid outlet temperature detector that detects the temperature of the absorption liquid on the outlet side of the absorber, and the temperature of the absorption liquid sprayed on the absorber The cooling water load is calculated from the difference between the temperature of the absorption liquid inlet temperature detector to be detected, the temperature detected by each cold water temperature detector, and the temperature difference between the cold water inlet and outlet at 100% load, and each cooling water temperature detector and the absorption liquid outlet Calculate the actual logarithmic average temperature difference of the absorber from the temperature detected by the temperature detector and the absorption liquid inlet temperature detector, and compare the actual logarithmic average temperature difference with the chilled water load to output an abnormality detector. Absorption type refrigeration characterized by having Machine abnormality detection device. 2. An absorption refrigerator having a regenerator, a condenser, an evaporator, an absorber and the like connected in a pipe, and a concentrated liquid temperature detector for detecting an absorption liquid temperature on the outlet side of the regenerator, and a condenser. A condensing temperature detector for detecting the condensing temperature of the evaporator, a cold water temperature detector for detecting the cold water inlet temperature and the outlet temperature of the evaporator, and an absorbing liquid outlet temperature detector for detecting the temperature of the absorbing liquid on the outlet side of the absorber. , A cooling water temperature detector that detects the cooling water inlet temperature and the outlet temperature of the absorber, a pressure detector that detects the pressure inside the absorber, and the temperature of the concentrated absorbing liquid detected by the concentrated liquid temperature detector, The concentration of the concentrated absorbent that is sprayed to the absorber is calculated from the condensation temperature detected by the condensation temperature detector, and the concentration of the concentrated absorbent that is sprayed to the absorber is calculated from the concentration of this concentrated absorbent and the pressure detected by the pressure detector. Calculate the temperature and determine the temperature of this concentrated absorbent and The actual logarithmic average temperature difference of the absorber is calculated from the collected liquid temperature and the cooling water inlet / outlet temperature detected by the cooling water temperature detector, and the difference between the detected temperature of each cold water temperature detector and the cold water inlet / outlet at 100% load Absorption refrigeration characterized in that it has an abnormality detector that calculates a cold water load from the temperature difference and compares the ideal logarithmic mean temperature difference and the actual logarithmic mean temperature difference for this cold water load and outputs an abnormal signal. Machine abnormality detection device. 3. An absorption refrigerator comprising a regenerator, a condenser, an evaporator, a refrigerant pump and an absorber connected to the evaporator, which are connected to each other by pipes, and the cold water inlet temperature and the outlet temperature of the evaporator are respectively set. Cooling water temperature detector to detect, cooling water temperature detector to detect the cooling water inlet temperature and outlet temperature of the absorber respectively, absorption liquid outlet temperature detector to detect the temperature of the absorption liquid on the outlet side of the absorber, absorption It stores the relationship between the absorption liquid inlet temperature detector that detects the temperature of the absorption liquid sprayed to the vessel and the cold water load and ideal logarithmic mean temperature difference when the evaporator is healthy. Difference in detection temperature and 100%
The cold water load is calculated from the cold water inlet / outlet temperature difference at the time of load, and the ideal logarithmic average temperature difference corresponding to this cold water load is obtained from the relationship between the cold water load and the ideal logarithmic average temperature difference, and each cooling water temperature detector Calculate the actual logarithmic mean temperature difference of the absorber from the temperatures detected by the absorption liquid outlet temperature detector and the absorption liquid inlet temperature detector, compare the actual logarithmic average temperature difference with the ideal logarithmic average temperature difference, and calculate the ideal logarithmic average. An abnormality detection device for an absorption chiller, comprising: an abnormality detector that outputs an abnormality signal when the ratio of the actual logarithmic average temperature difference to the temperature difference is equal to or greater than a predetermined value.