JP3258692B2 - Abnormality detector for absorption refrigerator - Google Patents

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 absorption refrigerating machine for detecting an abnormality in a low-temperature regenerator for separating an refrigerant by heating an absorbing liquid by refrigerant vapor flowing from a high-temperature regenerator to a low-temperature regenerator. The present invention relates to a refrigerator abnormality detection device.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No. 28454/1988 discloses that an absorption chiller / heater is provided with a temperature detector, for example, in an evaporator and a pipe connecting each element. A diagnostic device is disclosed that determines whether the operation state of the machine is transient or stable, executes a refrigeration capacity diagnosis of the absorption chiller / heater under the condition of a stable operation state, and displays a diagnosis result. .

[0003]

In the above prior art, when a decrease in refrigeration capacity is diagnosed, to determine what is the cause, for example, the refrigerant vapor is removed from the absorbent by the refrigerant vapor from the high temperature regenerator. Inlet and outlet for each component such as a low-temperature regenerator for separating water, or a solution heat exchanger for exchanging heat between the dilute absorbent flowing into the evaporator, the absorber and the regenerator and the concentrated absorbent returning to the absorber from the regenerator Detect temperature of INPUT
Needs to be compared with the design value at 100%. For this reason, when the absorption chiller is partially loaded or has almost no load, such as spring or autumn, except in summer, the abnormality cannot be accurately detected in the operation state, and the detection of the abnormality of the refrigerator is delayed or stopped. There is a problem that the absorption chiller / heater must be operated 100% to detect an abnormal point.

[0004]

In order to solve the above-mentioned problems, the present invention provides a high-temperature regenerator 4, in which an absorbent separated from the refrigerant by the high-temperature regenerator 4 flows and is absorbed by refrigerant vapor from the high-temperature regenerator 4. In an absorption refrigerator in which a low-temperature regenerator 6, a condenser 7, an evaporator 1, an absorber 2 and the like for heating a liquid to separate a refrigerant vapor are connected by piping, the cold water inlet temperature and the outlet temperature of the evaporator 1 Chilled water temperature detectors 36 and 3 to detect
7, an absorbent temperature detector 40, 41 for detecting the inlet temperature and the outlet temperature of the absorbent low-temperature regenerator 6, respectively, and a refrigerant temperature detector 38 for detecting the inlet temperature or the outlet temperature of the refrigerant low-temperature regenerator. Calculate the chilled water load from the difference between the detected temperatures of the chilled water temperature detectors and the chilled water inlet / outlet temperature difference at 100% load. Pair of Liquid Absorbent and Refrigerant
Calculate the number average temperature difference and calculate the ideal logarithmic average for the cold water load.
An abnormality detector for comparing the temperature difference with the actual logarithmic average temperature difference and outputting an abnormality signal, wherein the absorption type refrigerator reliably detects the abnormality of the low-temperature regenerator 6 even at a partial load. Is provided.

[0005] Further, chilled water temperature detectors 36 and 37 for detecting the chilled water inlet temperature and the outlet temperature of the evaporator 1, respectively, a first pressure detector 53 for detecting the pressure of the high temperature regenerator 4,
Regenerator temperature detector 55 for detecting the temperature of high temperature regenerator 4
A second pressure detector 54 for detecting the pressure in the upper trunk,
An absorbent temperature detector 41 for detecting the temperature of the absorbent on the outlet side of the low-temperature regenerator 6 and a relationship between the pressure of the high-temperature regenerator 4 and the saturated drain temperature are stored, and based on the pressure detected by the first pressure detector 53 The saturated drain temperature is obtained, and the concentration of the absorbent flowing into the low-temperature regenerator 6 is obtained from the pressure detected by the first pressure detector 53 and the temperature of the high-temperature regenerator 4 detected by the regenerator temperature detector 55. The saturation temperature of the low-temperature regenerator 6 is determined from the concentration and the pressure detected by the second pressure detector 54, and the saturation temperature of each of the chilled water temperature detectors 36 and 37 and the chilled water inlet / outlet temperature difference at 100% load are determined. The chilled water load is calculated, and the saturated drain temperature, the saturation temperature of the low-temperature regenerator 6 and the absorbent temperature detector 4 are calculated.
1 to calculate the actual logarithmic average temperature difference between the absorbent and the refrigerant in the low-temperature regenerator 6 from the outlet-side absorbent temperature detected by
Ideal log average temperature difference and actual log average temperature difference
And an abnormality detector that outputs an abnormality signal by comparing the abnormal conditions with each other, and an abnormality detector of the absorption refrigerator that more reliably detects the abnormality of the low-temperature regenerator 6 regardless of the load state of the absorption refrigerator. Things.

[0006]

[0007]

During operation of the absorption refrigerator, the abnormality detector 43 inputs temperature signals from the chilled water temperature detectors 36 and 37, the refrigerant temperature detector 38, the intermediate absorbent temperature detector 40, and the concentrated absorbent temperature detector 41. Then, the load is calculated from the chilled water inlet / outlet temperature difference at the time of a 100% load and the actual chilled water inlet / outlet temperature difference, and the actual logarithmic average temperature difference of the low-temperature regenerator 6 is calculated. And
This actual logarithmic average temperature difference is ideal for the load at that time.
If the temperature exceeds the abnormal line determined by the logarithmic average temperature difference , the abnormality detector 43 outputs an abnormality signal to notify the abnormality of the low-temperature regenerator 6, so that the absorption chiller is used in spring or autumn other than summer. An abnormality can be detected even at a partial load, and maintenance and inspection work can be performed early on an abnormality of the low-temperature regenerator 6.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an absorption chiller / heater which is an absorption refrigerator using, for example, water as a refrigerant and a lithium bromide (LiBr) solution as an absorption liquid (solution), wherein 1 is an evaporator, and 2 is an absorber. Reference numeral 3 denotes an evaporator absorber body (hereinafter, referred to as a lower body) containing the evaporator 1 and the absorber 2, 4 denotes a high-temperature regenerator equipped with, for example, a gas burner 5 and is heated by a high-temperature heat source, 6 denotes a low-temperature regenerator, 7 Is a condenser, 8 is an upper body containing the low-temperature regenerator 6 and the condenser 7, 9 is a rare absorbing liquid collected from the absorber 2 to the high-temperature regenerator 4 and the low-temperature regenerator 6 is an absorber 2
The low-temperature heat exchanger 10 is a solution heat exchanger for exchanging heat with the concentrated absorbent flowing to the low-temperature heat exchanger 9 through the low-temperature heat exchanger 9 from the absorber 2 and the low-temperature heat exchanger from the high-temperature regenerator 4. A high-temperature heat exchanger which is a solution heat exchanger for exchanging heat with an intermediate-concentration concentrated absorbent flowing into the regenerator 6, 11 to 15 are absorbent pipes, 16 is an absorbent pump, 17 and 18 are refrigerant pipes, and 19 is a refrigerant pipe. Refrigerant circulation pipe, 20 is a refrigerant pump, 23 is a cold water pipe provided with an evaporator heat exchanger 24 in the middle,
Each is connected by piping as shown in FIG.

Reference numeral 25 denotes a cooling water pipe, and an absorber heat exchanger 26 and a condenser heat exchanger 27 are provided in the cooling water pipe 25. 28 is a refrigerant bypass pipe connecting the refrigerant reservoir 29 of the evaporator 1 to the absorbent reservoir 30 of the absorber 2, 31 is an on-off valve, 32 is an absorbent bypass pipe connecting 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, and 35 is an on-off valve, and each of the on-off valves 31, 33,
35 is closed when supplying cold water and opened when supplying hot water.

Reference numerals 36 and 37 denote chilled water temperature detectors for detecting the chilled water inlet temperature and the outlet temperature of the evaporator 1, respectively, and reference numeral 38 denotes a refrigerant pipe 17 provided on the outlet side of the cryogenic regenerator 6 from the cryogenic regenerator 6. The refrigerant temperature detectors 40 and 41 detect the temperature of the refrigerant flowing to the refrigerant, that is, the refrigerant drain temperature, and the absorption liquid pipes 13 and 1 on the inlet side and the outlet side of the low temperature regenerator 6 respectively.
4 is an intermediate absorption liquid temperature detector for detecting the temperature of the intermediate absorption liquid flowing into the low temperature regenerator 6 and a concentrated absorption liquid temperature detector for detecting the temperature of the concentrated absorption liquid flowing out of the low temperature regenerator 6. .

Reference numeral 43 denotes an abnormality detector which inputs a temperature signal from each of the temperature detectors and detects an abnormality of the low-temperature regenerator 6. The abnormality detector 43 is, for example, a control panel (not shown) of an absorption refrigerator. ), And is composed of a microcomputer. An alarm device 44 is provided on the control panel similarly to the abnormality detector 43 and operates by inputting a signal from the abnormality detector. The notification device 44 includes, for example, a display device 45 having a plurality of segment elements and a buzzer 46. Then, the display device 45 displays the abnormality detector 4.
For example, the character “ALARM” blinks on the basis of the signal from “3”.

Hereinafter, the configuration of the abnormality detector 43 will be described with reference to FIG.
It will be described based on. 47 is a cold water temperature detector 36, 3
7. An input interface for inputting signals from the refrigerant temperature detector 38, the intermediate absorbent temperature detector 40, and the concentrated absorbent temperature detector 41, converting the signals, and outputting them to a central processing unit (hereinafter referred to as CPU) 48. And 49, a storage device (hereinafter referred to as a ROM) storing an operation program and the like related to the present invention.
Reference numeral 50 denotes an output interface for inputting a signal from the CPU 48 and outputting the signal to the notification device 44, and reference numeral 51 denotes a signal generator (hereinafter referred to as a CLOOK) for outputting a signal every predetermined time.
, 52 is a readable and erasable storage device (hereinafter referred to as RAM) for storing the temperature detected by each temperature detector.

The ROM 49 stores a refrigerant drain temperature T.
1. The logarithmic average temperature difference Tlm, which is the average value of the actual temperature difference of the low-temperature regenerator 6, is calculated from the intermediate absorption solution temperature T2 and the concentrated absorption solution temperature T3.

[0014]

(Equation 1)

And 1 during normal operation of the absorption refrigerator.
A program for calculating the chilled water load from the difference between the chilled water inlet temperature and the chilled water outlet temperature at the time of the 00% load and the actually detected difference between the chilled water inlet temperature and the chilled water outlet temperature. The relationship with the logarithmic average temperature difference of No. 6 is stored. As shown in FIG. 3, the ROM 49 stores the chilled water load and the ideal logarithmic flatness when the absorption chiller is operating normally.
An ideal line indicating the relationship with the average temperature difference and an abnormal line for outputting an abnormal signal are stored.

During the operation of the absorption chiller for supplying cold water, the refrigerant vapor evaporated in the high-temperature regenerator 4 flows to the low-temperature regenerator 6 as in the conventional absorption chiller, and the intermediate vapor flows from the high-temperature regenerator 4. The absorption liquid is heated and condensed, and the condensed refrigerant flows to the condenser 7. The refrigerant vapor evaporated in the low-temperature regenerator 6 flows to the condenser 7 and exchanges heat with the cooling water flowing through the condenser heat exchanger 27 to be condensed and liquefied. Then, the refrigerant liquid flows from the condenser 7 to the evaporator 1 via the refrigerant pipe 18. Then, the refrigerant exchanges heat with water flowing through the evaporator heat exchanger 24 to evaporate, and the water flowing through the evaporator heat exchanger 24 is cooled by heat of vaporization. Then, cold water circulates through the load. Further, the refrigerant evaporated in the evaporator 1 is absorbed by the absorbing liquid in the absorber 2. The rare absorbing liquid whose concentration has been reduced by absorbing the refrigerant is supplied to the absorbing liquid pump 16.
Is sent to the high-temperature regenerator 4 via the low-temperature heat exchanger 9 and the high-temperature heat exchanger 10. The absorbing liquid sent to the high-temperature regenerator 4 is heated by the burner 5 to evaporate the refrigerant, and the intermediate absorbing 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 increase the concentration. The concentrated absorbent having a high concentration passes through the low-temperature heat exchanger 9 and its temperature is lowered and sent to the absorber 2 for dispersion.

As described above, the abnormality detection when the absorption refrigerator is in operation will be described with reference to the flowchart of FIG. The temperatures detected by the chilled water temperature detectors 36 and 37, the refrigerant temperature detector 38, the intermediate absorbent temperature detector 40, and the concentrated absorbent temperature detector 41 are temporarily stored in the RAM 52 via the input interface 47 and the CPU 48. It is memorized. Then, based on the signal from the CLOCK 51, the cold water inlet temperature, the cold water outlet temperature, the refrigerant drain temperature, the intermediate liquid collecting temperature, and the thick absorbing liquid temperature stored in the RAM 52 at predetermined time intervals are read into the CPU 48, and read from the ROM 49.
Is read from equation (1), the program, and the relationship between the chilled water load and the logarithmic average temperature difference. Then, the difference between the actual chilled water inlet / outlet temperature and the chilled water inlet / outlet temperature at 100% load (5
° C) and the load (%) is calculated. 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 becomes 3/5 = 0.6 (60%).

In the CPU 48, the refrigerant drain temperature,
The actual logarithmic mean temperature difference Tlm is calculated from the temperature of the intermediate absorbent and the temperature of the concentrated absorbent and Equation 1 of the above equation. Here, for example, the temperature of the refrigerant vapor as the heat source fluid rises due to the mixing of the absorbing liquid into the refrigerant flowing from the high temperature generator 4 to the low temperature regenerator 6, or the refrigerant vapor is generated at the low temperature regenerator 6 by mixing the non-condensable gas. When the refrigerant drain temperature is, for example, 91 ° C., the intermediate absorbing liquid temperature is, for example, 80 ° C., and the concentrated absorbing liquid temperature is, for example, 84 ° C., the actual logarithmic average is obtained. The temperature difference is approximately 8.7 ° C. Since the actual logarithmic average temperature difference is higher than the value (6.2 ° C.) when the load of the abnormal line is 60% shown in FIG.
U48 outputs an abnormal signal through the output interface 50, and an abnormal signal is output from the abnormality detector 43 to the notification device 44. A is displayed on the display device 45 of the notification device 44.
LARM is displayed and the buzzer-46 sounds,
An abnormality of the absorber 2 is notified.

When the load of the chilled water is, for example, 60%, the actual logarithmic mean temperature difference Tlm calculated from the refrigerant drain temperature, the intermediate absorbing solution temperature, the concentrated absorbing solution temperature and the equation (1) is, for example, 7.8 ° C. When the load is lower than the value (8.2 ° C.) on the abnormal line when the load is 60%, the CPU 48 does not output the abnormal signal and the notifying device 44 does not notify the abnormality. According to the above embodiment, the abnormality detector 43 calculates the actual logarithmic average temperature difference based on the refrigerant drain temperature, the intermediate absorption liquid temperature, and the concentrated absorption liquid temperature and the above equation (1). That is, if the heating efficiency is reduced due to the mixing of the absorbing liquid into the refrigerant and the mixing of the non-condensable gas and the actual logarithmic average temperature difference exceeds the abnormal line stored in advance, the abnormality detector 43 Outputs a signal. If an abnormality occurs in the low-temperature regenerator 6 even in an intermediate period other than summer or winter, the abnormality is detected at the time of partial load of the absorption chiller / heater, and the early stage of the abnormality occurrence is dealt with. As a result, maintenance and inspection of the absorption chiller / heater can be performed more reliably.

Further, it is possible to quantitatively grasp the decrease in the performance of the low-temperature regenerator 6 based on the actual logarithmic average temperature difference.
Further, it is possible to cope with the situation before the capacity is significantly reduced due to the mixing of the absorbing liquid into the refrigerant or the generation of the non-condensable gas, and the maintenance and inspection can be performed in the early stage of the occurrence of the abnormality.

In the above embodiment, the refrigerant drain temperature of the low-temperature regenerator 6 is substituted into the above equation (1). However, since the refrigerant drain temperature and the steam temperature at the outlet side of the low-temperature regenerator 6 are almost equal, The temperature of the steam at the outlet side may be detected, and this temperature may be substituted into Equation 1 in the same manner as the refrigerant drain temperature. Further, the actual log average temperature difference is calculated, and the ideal log average temperature difference and the actual log average temperature difference corresponding to the load obtained from the relationship between the load stored in advance and the ideal log average temperature difference are calculated. For example, when the difference between the actual log-average temperature difference and the ideal log-average temperature difference or the ratio of the actual log-average temperature difference to the ideal log-average temperature difference exceeds a predetermined value, an abnormality is notified. You may do it.

Further, the average value of the temperature differences was used to calculate the logarithmic average temperature difference, which was used for abnormality notification. Instead of this logarithmic average temperature difference, the difference between the refrigerant drain temperature T1 and the intermediate absorbent temperature T2 was obtained. , The difference between the refrigerant drain temperature T1 and the concentrated absorption liquid temperature T3 is determined, and the difference between the respective temperature differences is calculated to obtain 2
May be used as the average value of the temperature difference. In this case, the average value of the temperature difference can be easily obtained as compared with the case of the logarithmic average temperature difference, but the accuracy of the average value of the temperature difference is lower than the logarithmic average temperature difference.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. It should be noted that a configuration that is not particularly described is the same as the above-described embodiment, and a detailed description is omitted. 53 is a first pressure detector connected to the high temperature regenerator 4, 54 is a second pressure detector provided on the upper body 8, 55
Is a high-temperature regenerator temperature detector for detecting the temperature T7 of the high-temperature generator 4, the first pressure detector 53 detects the pressure of the high-temperature generator 4, and the second pressure detector 54 detects the temperature of the condenser 7. Detect pressure.

The ROM of the abnormality detector 43 stores a water saturation line and a During diagram of the absorption chiller / heater.
Further, an actual logarithmic mean temperature difference of the low-temperature regenerator 6 is obtained from the above-mentioned saturated drain temperature T4, the saturation temperature T5 of the low-temperature regenerator 6 and the thick absorbing solution temperature T6 which is the absorbent outlet temperature of the low-temperature regenerator 6. Is the expression

[0025]

(Equation 2)

Has been stored. Then, during the operation of the absorption chiller / heater, the saturated drain temperature T4 is obtained from the pressure P1 of the high-temperature regenerator 4 detected by the first pressure detector 53 based on the water saturation line as shown in FIG. Further, the concentration of the intermediate absorbent flowing out of the high-temperature regenerator 4 is obtained from the pressure P1 of the high-temperature regenerator 4 and the temperature T7 of the high-temperature regenerator 4. Then, the pressure P of the condenser 7 detected by the second pressure detector 54
The saturation temperature T5 of the low-temperature regenerator 6 is determined from FIG. 2 and the concentration of the intermediate absorbing solution as shown in FIG. Further, the actual logarithmic average temperature of the low-temperature regenerator 6 is substituted by substituting the rich-absorbent temperature T6, the saturated drain temperature T4, and the saturation temperature T5 of the low-temperature regenerator 6 detected by the high-absorbent liquid temperature detector 41 into the above equation (2). Find the difference. Here, the pressure P1 of the high-temperature regenerator 4 detected by the first pressure detector 53 is, for example, 542 mmHg, the saturated drain temperature is 90.8 ° C., and the temperature T4 of the high-temperature regenerator 4 is, for example, 140 ° C. When the concentration of the absorbing solution is 60%, the pressure P2 of the condenser 7 is, for example, 44 mmHg, and the saturation temperature T6 of the low temperature regenerator 6 obtained from this pressure and the concentration of the intermediate absorbing solution is, for example, 80 ° C., Substituting each temperature into 2, the actual logarithmic average temperature difference of the low temperature regenerator 6 becomes 8.7 ° C. If the actual logarithmic average temperature difference is higher than the abnormal line shown in FIG. 2, an abnormality signal is output from the abnormality detector 43 to the notification device 44. Then, ALARM is displayed on the display device 45 of the notification device 44 and a buzzer is displayed.
46 is sounded to notify the abnormality of the absorber 2.

As described above, when the saturation temperature T6 of the low-temperature regenerator 6, that is, the saturation temperature of the intermediate absorbent, is obtained from the pressure P2 of the condenser 7 and the concentration of the intermediate absorbent,
The same operation and effect can be obtained as in the case where the temperature of the intermediate absorbent is detected, and the actual logarithmic average temperature difference is calculated using the temperature of the intermediate absorbent detected by the intermediate absorbent temperature detector 40. The actual logarithmic average temperature difference can be obtained more accurately than in the case of obtaining the temperature, and the accuracy of the abnormality detection of the low-temperature regenerator 6 can be further improved.

Further, as shown in the above embodiment, the actual logarithmic average temperature difference of the low temperature regenerator 6 or the average value of the temperature difference is obtained. Then, the logarithmic average temperature difference or the ratio of the cold water load to the average value of the temperature difference is calculated. For example, the cold water load is 60%, the actual log average temperature difference is 8.7 ° C, and the ratio of the load to the log average temperature difference is 0.10 ° C /
In the case where the abnormality detection device 43 outputs an abnormality signal when the ratio exceeds a predetermined value, for example, 0.13 ° C./%, the same operation and effect as in the above embodiment can be obtained. Can be.

Further, the ratio of the actual log average temperature difference or the average value of the temperature difference to the ideal log average temperature difference or the average value of the temperature difference is calculated. Then, when this ratio exceeds a predetermined value, the abnormality detector 43 outputs an abnormality signal.
For example, if the load is 60% and the actual log average temperature difference is 8.7
When the ideal logarithmic average temperature difference is 6.2 ° C., the above ratio is 8.7 / 6.2 = 1.4, which is a predetermined value (for example, 1.
3) In the above case, the abnormality detector 43 outputs an abnormality signal. Further, the actual heat transmission coefficient which is the reciprocal of the above ratio is calculated, and when the heat transmission coefficient becomes a predetermined value (for example, 80%) or less, the abnormality detector 43 outputs an abnormality signal. Can obtain the same effect.

Although the above embodiment has been described based on the absorption type chiller / heater capable of supplying cold or hot water, the absorption type chiller which supplies only cold water may be provided with an abnormality detector similarly to the above embodiment. Thereby, the same operation and effect can be obtained.

[0031]

According to the present invention, there is provided an abnormality detecting device for an absorption refrigerator configured as in the above embodiment, in which a chilled water inlet temperature and an outlet temperature of an evaporator are detected by a chilled water temperature output device, respectively. The inlet temperature and the outlet temperature of the low-temperature regenerator are respectively detected by the absorbent temperature detector, and the refrigerant temperature detector that detects the inlet temperature or the outlet temperature of the low-temperature regenerator of the refrigerant is detected.
Calculate the chilled water load from the difference between the detected temperature of each chilled water temperature detector and the chilled water inlet / outlet temperature difference at the time of 100% load, and from the detected temperature of each absorbent temperature detector and the refrigerant temperature detector, and
The actual logarithmic average temperature difference between the absorbent and the refrigerant in the low-temperature regenerator is calculated from the temperatures detected by each of the absorbent temperature detector and the refrigerant temperature detector.
Calculate the ideal logarithmic mean temperature difference and actual
Outputs an abnormal signal by comparing with the number average temperature difference.
Logarithmic mean temperature difference to compare the logarithmic mean temperature difference
Without actually performing an experiment etc.
It can easily calculate the low-temperature regenerator capacity, and can reliably detect the low-temperature regenerator abnormality even when the absorption chiller is partially loaded. As a result, maintenance of the absorption chiller can be performed at an early stage, and the suspension of the absorption chiller can be avoided.

Further, a chilled water temperature detector for detecting a chilled water inlet temperature and an outlet temperature of the evaporator is detected, a pressure of the high temperature regenerator is detected by a first pressure detector, and a temperature of the high temperature regenerator is regenerated. The temperature inside the upper body is detected by the second pressure detector, the temperature of the absorbent on the outlet side of the low-temperature regenerator is detected by the absorbent temperature detector, and the first pressure detector detects The saturated drain temperature is determined from the detected pressure, and the concentration of the absorbent flowing into the low-temperature regenerator is determined from the pressure detected by the first pressure detector and the temperature of the high-temperature regenerator detected by the regenerator temperature detector. concentration and determine the saturation temperature of the low temperature regenerator and a second pressure that the pressure detector detects the cold from the cold water inlet and outlet temperature difference during differential 100% load of the detected temperature of the chilled water temperature detector
Calculate the water load, and calculate the actual logarithmic average temperature difference between the absorbent and the refrigerant in the low-temperature regenerator from the saturated drain temperature, the saturation temperature of the low-temperature regenerator, and the detection temperature of the absorbent temperature detector ,
Ideal log average temperature difference and actual log average temperature for chilled water load
The abnormality detector outputs an abnormality signal by comparing the temperature difference with the temperature difference, so that the temperature of the saturated drain of the refrigerant and the temperature of the intermediate absorbent, which is the temperature of the absorbent flowing into the low-temperature regenerator, can be accurately obtained. An abnormal condition of the low-temperature regenerator can be detected more accurately while the refrigerator is operating , and the actual logarithmic average temperature
The ideal logarithmic mean temperature difference to be compared
Easier with simulation, for example
And the partial load of the absorption refrigerator
Even at low temperatures, it is possible to more accurately detect abnormalities in the low-temperature regenerator.
Can be.

[0033]

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an absorption refrigerator showing one 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 illustrating the operation of the abnormality detection device.

FIG. 5 is a schematic configuration diagram of an absorption refrigerator showing a second embodiment of the present invention.

FIG. 6 is a diagram showing the relationship between the temperature of the high-temperature regenerator, the saturation temperature of the low-temperature regenerator or the saturated drain temperature of the refrigerant, and the pressure of the high-temperature regenerator or the pressure of the condenser.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 4 High temperature regenerator 6 Low temperature regenerator 36 Cold water temperature detector 37 Cold water temperature detector 38 Refrigerant temperature detector 40 Intermediate absorption liquid temperature detector 41 Rich absorption liquid temperature detector 43 Abnormality detector

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-146966 (JP, A) JP-A-3-67966 (JP, A) JP-A-61-15468 (JP, U) (58) Survey Field (Int. Cl. ⁷ , DB name) F25B 15/00, 49/04

Claims (2)

(57) [Claims] 1. A high-temperature regenerator, a low-temperature regenerator, a condenser, and an evaporator, in which an absorbing liquid from which a refrigerant has been separated by the high-temperature regenerator flows in, and the refrigerant vapor is separated by heating the absorbing liquid with the refrigerant vapor from the high-temperature regenerator. Chiller temperature detector that detects the chilled water inlet temperature and outlet temperature of the evaporator, and the inlet temperature and outlet temperature of the absorbent low-temperature regenerator, respectively. An absorption liquid temperature detector for detecting, a refrigerant temperature detector for detecting an inlet temperature or an outlet temperature of the low temperature regenerator of the refrigerant, a difference between detection temperatures of the respective chilled water temperature detectors, and a difference between the chilled water inlet / outlet temperatures at 100% load. And the actual logarithmic average temperature difference between the absorbent and the refrigerant in the low-temperature regenerator from the detected temperatures of each of the absorbent temperature detector and the refrigerant temperature detector.
An abnormality detection device for an absorption refrigerator, comprising: an abnormality detector that compares an imaginary log average temperature difference with an actual log average temperature difference and outputs an abnormality signal. 2. A high-temperature regenerator, a low-temperature regenerator and a condenser in which an absorbing liquid from which a refrigerant has been separated by the high-temperature regenerator flows in, and the absorbing liquid is heated by the refrigerant vapor from the high-temperature regenerator to separate the refrigerant vapor. In an absorption refrigerator in which a condenser and a low-temperature regenerator are housed, an evaporator and an absorber are connected by piping, a chilled water temperature detector that detects a chilled water inlet temperature and an outlet temperature of the evaporator, A first pressure detector for detecting the pressure of the high temperature regenerator, a regenerator temperature detector for detecting the temperature of the high temperature regenerator, a second pressure detector for detecting the pressure in the upper body, and a low temperature regenerator An absorption liquid temperature detector for detecting the outlet side absorption liquid temperature, and a relationship between the pressure of the high-temperature regenerator and the saturated drain temperature, and obtain a saturated drain temperature from the pressure detected by the first pressure detector. Pressure detected by pressure sensor 1 and regenerator temperature detection The concentration of the absorbent flowing into the low-temperature regenerator is determined from the temperature of the high-temperature regenerator detected by the regenerator, and the saturation temperature of the low-temperature regenerator is determined from the concentration and the pressure detected by the second pressure detector. Difference between temperature detected by temperature detector and 1
The chilled water load is calculated from the chilled water inlet / outlet temperature difference at the time of the 00% load, and the absorption at the low temperature regenerator is performed based on the saturated drain temperature, the saturation temperature of the low temperature regenerator, and the outlet side absorption liquid temperature detected by the absorption liquid temperature detector. Calculate actual logarithmic average temperature difference between liquid and refrigerant
And the ideal logarithmic mean temperature difference and the actual logarithmic
An abnormality detector for comparing the average temperature difference with the abnormality temperature and outputting an abnormality signal.