JPH07324850A - Malfunction deciding device for absorption type hot and chilled water generator - Google Patents

Abstract

PURPOSE:To accurately decide the abnormal concentration of absorbing solution based on the measurement of a thermometer without using a pressure sensor in an absorption type hot and chilled water generator. CONSTITUTION:An absorbing solution temperature, a refrigerant condensing temperature and a cooling water temperature are measured by a sensor group 7. The refrigerant condensing temperature correcting unit 81 of an arithmetic processor 8 calculates temperature correction data based on the measured cooling water temperature, and corrects the refrigerant condensing temperature according to the temperature correction data. The unit 81 estimates the concentrated solution concentration based on the corrected refrigerant condensing temperature and the absorbing solution temperature. A concentrated solution concentration abnormality detector 83 decides the occurrence of the abnormality based on the estimated value of the concentrated solution concentration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption chiller / heater,
In particular, the present invention relates to a device for determining an abnormal concentration of absorbing liquid.

[0002]

2. Description of the Related Art As shown in FIG. 8, an absorption chiller-heater has an upper body (1) including a condenser (11) and a low temperature regenerator (12), and an evaporator.
Lower body (2) consisting of (21) and absorber (22), high temperature regenerator (3) with built-in burner (31), high temperature heat exchanger (4), low temperature heat exchanger (5), etc. The refrigeration cycle is realized by connecting piping and circulating the absorbing liquid between the high temperature regenerator (3), the low temperature regenerator (12) and the absorber (22) by the absorbing liquid pump (6). In the absorption chiller-heater, the opening of the gas valve (32) is controlled to supply the fuel gas to the burner (31) in order to keep the temperature of the chilled water supplied from the evaporator (21) at the target value. The amount is adjusted.

By the way, in the cooler / heater for the absorber, the concentration (concentration of the lithium bromide solution) of the absorbing liquid (lithium bromide solution) supplied from the low temperature regenerator (12) through the low temperature heat exchanger (5) to the absorber (22) is increased. (Liquid concentration)
If the value exceeds a certain value, the absorption liquid will crystallize and the operation will be hindered. Therefore, conventionally, there is provided a safety device that constantly monitors the concentration of the absorbing liquid and stops the operation of the chiller-heater when the concentration of the concentrated liquid exceeds a certain value.

Since an expensive densitometer is required to measure the concentration of the concentrated liquid, conventionally, the saturated vapor temperature Tcon in the condenser (11) has been utilized by utilizing the Duhring diagram shown in FIG.
d and the absorption liquid temperature Ts_h at the low temperature regenerator (12) outlet
The concentration of the concentrated liquid is estimated based on the measured value of i. That is,
On the Duhring diagram, the intersection of the saturation pressure Ps of water corresponding to the saturation vapor temperature Tcond and the absorption liquid temperature Ts_hi is obtained, and the concentration Ds at the intersection is read to obtain the concentration of the concentrated liquid.

Here, the saturated vapor temperature Tcond is the upper body
(1) With the method of directly measuring the temperature of the steam flowing inside, it is not possible to obtain accurate measurement results.
The pressure in (1) is measured, and the saturated vapor temperature Tco is calculated by the following equation 1 which represents the water curve on the Duhring diagram of FIG.
Calculate nd.

[Equation 1] Tcond = [-b + {b ² -4 ・ c ・ (a-log Pup)} ^0.5 ] / {2 ・
(a-log Pup)}-273.0

Further, the concentrated liquid concentration Ds can be calculated by the empirical formula of the following equation 2.

## EQU2 ## Ds = (Ts_hi + 280.0) × 139.0 / (Tcond + 273.0) -102.4 By comparing the concentrated liquid concentration Ds thus obtained with the reference value, the concentration abnormality can be determined.

[0007]

However, the upper body
Also in the method of calculating the saturated vapor temperature Tcond from the pressure Pup in (1), the pressure sensor is more expensive than the thermometer and there is a problem that maintenance is difficult. On the other hand, an operation monitoring device has been proposed that calculates the concentration of the concentrated liquid in the theoretical cycle based on the temperature measurement value of each part (JP-A-63-297970 [F25B15 / 00]), but the device is based on the theoretical cycle. Therefore, there is a problem that there is a large difference from the concentration of the concentrated liquid in the actual machine, and it is difficult to accurately determine the concentration abnormality. An object of the present invention is to accurately determine an abnormal concentration of the absorbing liquid based on the measurement using a thermometer without using a pressure sensor.

[0008]

A first abnormality determination device for an absorption chiller-heater according to the present invention is (a) the temperature of an absorbing liquid flowing toward an absorber (22) and a condenser (11). Sensor means for detecting the condensing temperature of the refrigerant in the refrigerant and the temperature of the cooling water flowing through the absorber (22) and the condenser (11), and (b) saturation of the condenser (11) with the cooling water temperature as a variable. Temperature correction data corresponding to the difference between the vapor temperature and the refrigerant condensing temperature is derived from the storage means that is stored in advance and (c) the cooling water temperature obtained from the sensor means to derive the temperature correction data from the storage means. , Based on the temperature correction means for correcting the refrigerant condensation temperature obtained from the sensor means by the temperature correction data, (d) the refrigerant condensation temperature corrected by the temperature correction means, and the absorbing liquid temperature obtained from the sensor means , Concentration estimating means for estimating the concentration of the absorbing liquid (concentration of concentrated liquid), (e) An abnormality determining means for determining the occurrence of abnormality based on the estimated value of the concentrated liquid concentration obtained from the concentration estimating means.

In a concrete configuration, the abnormality determining means includes a calculating means for deriving a normal value of the concentrated liquid concentration based on the refrigerating load and the cooling water temperature, and an estimated value of the concentrated liquid concentration obtained from the concentration estimating means. Diagnostic data representing the degree of abnormality is created and output according to the magnitude of the difference between the concentrated concentration and the normal value.

A second abnormality determining apparatus according to the present invention is (a)
Sensor means for detecting the refrigeration load and the temperature of the cooling water flowing through the absorber (22) and the condenser (11); and (b) the absorber (2
Concentration detecting means for detecting the concentration of the absorbing liquid flowing toward 2) (concentration of concentrated liquid) by measurement including actual measurement or estimation, and (c)
The freezing load and the cooling water temperature obtained from the storing means (d) the sensor means in which the concentrated liquid concentration characteristic representing the change in the concentrated liquid concentration during the normal operation is stored in advance using the freezing load and the cooling water temperature as variables. Calculating means for deriving a normal value of the concentrated liquid concentration from the concentrated liquid concentration characteristic of the storing means,
An abnormality determination means is provided for comparing the concentration of the concentrated liquid detected by the concentration detection means with a normal value of the concentration of the concentrated liquid derived by the calculation means, and determining the occurrence of an abnormality based on the comparison result. .

In a concrete configuration, the sensor means further detects the condensation temperature of the refrigerant in the condenser (11), and
The concentration detecting means (f) is a storage means in which temperature correction data corresponding to the difference between the saturated vapor temperature of the condenser (11) and the refrigerant condensing temperature is stored in advance using (f) the cooling water temperature as a variable, and (g)
Temperature correction means for deriving temperature correction data from the storage means based on the cooling water temperature obtained from the sensor means, and correcting the refrigerant condensing temperature by the temperature correction data;
(h) Concentration estimating means for estimating the concentration of the concentrated liquid based on the refrigerant condensing temperature corrected by the temperature correcting means and the absorbing liquid temperature detected by the sensor means.

[0012]

In the first abnormality determination device, the condenser (1
In order to detect the saturated steam temperature in 1), two measurement principles are adopted. The first measurement principle is that the saturated vapor temperature is substantially the same as the refrigerant condensation temperature, and the second measurement principle is that the difference between the saturated vapor temperature and the refrigerant condensation temperature changes according to the cooling water temperature. That is, although the saturated vapor temperature is almost equal to the refrigerant condensing temperature, the vapor generated in the high temperature regenerator (3) is condensed and flows into the condenser (11). There is a difference in. By the way, in the absorption chiller-heater, the operating state changes greatly with the change of the cooling water temperature, and the temperature change and pressure change of each part at this time are
It is considered that it can be approximated by a function with the cooling water temperature as a variable. Therefore, similarly, the difference between the saturated steam temperature and the refrigerant condensation temperature is also specified in advance as a function of the cooling water temperature, and the difference between the saturated steam temperature and the refrigerant condensation temperature is derived from the measured value of the cooling water temperature. It corrects the temperature.

In the first abnormality determining device, the temperature of the cooling water flowing into the absorber (22) is previously in a normal operating state.
(Cooling water inlet temperature), or the temperature of cooling water flowing from the absorber (22) to the condenser (11) (cooling water intermediate temperature), or the condenser (1
While changing the temperature of the cooling water flowing out from 1) (cooling water outlet temperature), the difference between the saturated vapor temperature of the condenser (11) and the refrigerant condensation temperature is measured, and the result is stored in the storage means as temperature correction data. To be done. At the time of abnormality determination, the temperature correction data is derived from the storage means based on the cooling water temperature obtained from the sensor means, and the temperature correction data is added to the refrigerant condensation temperature obtained from the sensor means to correct the refrigerant condensation temperature. To be done. As a result, an accurate saturated steam temperature can be obtained.

By using the refrigerant condensing temperature corrected in this way, that is, the accurate saturated vapor temperature and the actual measured value of the absorbing liquid temperature, it is possible to accurately estimate the concentrated liquid concentration from, for example, a Duhring diagram. Is. Then, by comparing the estimated value of the concentrated concentration with the threshold value, the presence or absence of an abnormality and the degree of the abnormality are determined.

Here, since the normal value of the concentrated liquid concentration changes depending on the refrigerating load and the cooling water temperature, if the normal value of the concentrated liquid concentration is made into a function with the refrigerating load and the cooling water temperature as variables in advance, It is possible to calculate the normal value of the concentrated liquid concentration based on the actual measurement values of the refrigeration load and the cooling water temperature. Therefore, in the above specific configuration, diagnostic data indicating the degree of abnormality is created according to the magnitude of the difference between the estimated value of the concentrated liquid concentration and the normal value of the concentrated liquid concentration. This enables more accurate abnormality determination.

In the second abnormality judging device, the concentration of the absorption type liquid is measured or measured by the same estimation as in the first abnormality judging device. On the other hand, the normal value of the concentration of the concentrated liquid is derived from the concentration characteristic of the concentrated liquid having the variables of the refrigeration load and the cooling water temperature, as in the specific configuration of the first abnormality determination device.

Here, when estimating the concentration of the concentrated liquid, the same two measuring principles as those of the first abnormality determining device can be adopted. That is, at the time of abnormality determination, the temperature correction data is derived based on the measured value of the cooling water temperature, and by adding the temperature correction data to the refrigerant condensation temperature, the refrigerant condensation temperature is corrected and the accurate saturated vapor temperature is calculated. It The concentrated liquid concentration is accurately estimated based on the measured values of the accurate saturated vapor temperature and the absorbed liquid temperature.

[0018]

EFFECT OF THE INVENTION In the abnormality determining apparatus for the absorption chiller-heater according to the present invention, since the operation data of the actual machine is made into a function and the concentration of the concentrated liquid is calculated from the temperature measurement data, the accurate concentration of the concentrated liquid can be obtained. In addition, the pressure measurement is not required, and the simple configuration enables highly reliable and accurate determination of the concentration abnormality.

[0019]

EXAMPLE An example in which the present invention is applied to the absorption chiller-heater of FIG. 8 will be described in detail below with reference to the drawings. First Embodiment As shown in FIG. 1, a group of sensors arranged in the main body of the water cooler / heater.
By (7), the temperature Ts_hi at the outlet of the low temperature regenerator (12) of the absorbing liquid, the temperature Tco_out at the outlet of the condenser (11) of the cooling water, and the refrigerant condensing temperature Tv_ at the condenser (11).
The cond is measured, and these measurement data are supplied to the arithmetic processing circuit (8) including a microcomputer.

In the arithmetic processing circuit (8), the cooling water outlet temperature T
Based on the measured value of co_out, the refrigerant condensing temperature Tv_
Refrigerant condensing temperature correction unit (81) for correcting the measured value of cond
Is provided. In the refrigerant condensing temperature correction unit (81), the refrigerant condensing temperature Tv_cond
A procedure for adding the correction amount g (Tco_out) of the refrigerant condensing temperature with the cooling water outlet temperature Tco_out as a variable to derive the refrigerant condensing temperature correction value mTv_cond is registered.

[Equation 3] mTv_cond = Tv_cond + g (Tco_out)

Refrigerant condensing temperature correction amount g (Tco_out)
Is experimentally obtained in advance. That is, in a normal operating state of the absorption chiller-heater, the difference between the upper body saturated vapor temperature and the refrigerant condensation temperature is measured while changing the cooling water outlet temperature as shown in FIG. Then, regression analysis is performed on these measurement results, and the difference between the upper body saturated vapor temperature and the refrigerant condensation temperature is made into a function with the cooling water outlet temperature as a variable. For example, the following Expression 4 is obtained from FIG.

[Equation 4] g (Tco_out) = − 2.98 + 0.154 ・ Tco_out−2.12 × 1
0 ^-3・ Tco_out ²

The refrigerant condensation temperature correction amount can be defined as a function g (Tco_in) of the cooling water inlet temperature or a function g (Tco_mid) of the cooling water intermediate temperature. In this case, the refrigerant condensation temperature correction unit (81) has the following formula 5
Alternatively, the correction formula shown in Formula 6 is registered.

[0023]

[Equation 5] mTv_cond = Tv_cond + g (Tco_in)

[Equation 6] mTv_cond = Tv_cond + g (Tco_mid)

Correction amount g (Tco_in) of the refrigerant condensing temperature,
g (Tco_mid) is experimentally obtained in advance. That is, in a normal operating state of the absorption chiller-heater, while changing the cooling water inlet temperature as shown in FIG. 3 or changing the cooling water intermediate temperature as shown in FIG. And measure the difference in refrigerant condensation temperature. Then, a regression analysis is performed on these measurement results, and the difference between the upper body saturated vapor temperature and the refrigerant condensation temperature is made into a function. For example, the following Expression 7 is obtained from FIG.

[Equation 7] g (Tco_in) = -0.752 + 1.35 x 10 ^-2 · Tco_in + 1.7
7 x 10 ^-4 / Tco_in ²

The following equation 8 is obtained from FIG.

[Equation 8] g (Tco_mid) = − 3.16 + 0.173 ・ Tco_mid−2.52 × 1
0 ^-3・ Tco_mid ²

The refrigerant condensing temperature mTv_cond corrected by the refrigerant condensing temperature correcting section (81) in FIG.
Supplied to (82). The concentrated liquid concentration estimating unit (82) calculates the concentrated liquid concentration Ds from the following equation 9 based on the refrigerant condensing temperature mTv_cond and the low temperature regenerator outlet temperature Ts_hi of the absorbing liquid obtained from the sensor group (7).

[0027]

[Equation 9] Ds = (Ts_hi + 280.0) × 139.0 / (mTv_cond + 273.
0) −102.4 In addition, the above equation 9 is the saturated vapor temperature Tcond of the upper body in the conventionally known empirical equation of the above equation 2.
Is the corrected refrigerant condensation temperature mTv_cond.

The concentrated liquid concentration Ds calculated by the concentrated liquid concentration estimating unit (82) is sent to the concentrated liquid concentration abnormality detecting unit (83), and diagnostic data representing the degree of abnormality is prepared based on the following equation 10, for example. To be done. Further, the diagnostic data is output to a notification device (9) such as a display and an alarm device. Here, if the diagnostic data is abnormal, the safety device operates and the operation of the absorption chiller-heater is stopped.

[0029]

[Formula 10] if Ds> 65% then diagnostic data = abnormal if 64.5% <Ds <65% then diagnostic data = caution if Ds <64.5% then diagnostic data = normal

According to the above-mentioned abnormality judging device, the concentration of the concentrated liquid can be accurately estimated based on the measurement using only the thermometer, and as a result, the accurate abnormality judgment can be carried out.

Second Embodiment In the first embodiment described above, the estimated value of the concentration of the concentrated liquid is compared with a fixed reference value to determine the abnormality.
It aims to realize more accurate abnormality determination based on the normal value of the concentration of the concentrated liquid.

By the way, in the absorption chiller-heater, the operating state of each part changes depending on the cooling water temperature, and many state quantities such as temperature and pressure can be approximated as a function of the cooling water temperature. Therefore, as shown in FIG. 7, when the concentration of the concentrated liquid is measured while the cooling water inlet temperature is kept constant and the refrigeration load is changed, a constant relationship along a quadratic curve is shown as shown by the solid line in the figure. Is obtained. Also, as the cooling water inlet temperature decreases,
The relationship between the freezing load and the quadratic curve of the concentrated liquid concentration changes to the low concentration side. Therefore, if the relationship between the refrigerating load and the concentrated liquid concentration is made into a function in advance under normal operating conditions using the cooling water inlet temperature as a parameter, the concentrated liquid concentration can be calculated based on the measured values of the cooling water inlet temperature and the refrigerating load. The normal value of can be calculated.

In the present embodiment, as shown in FIG. 6, the temperature sensor Ts_hi at the outlet of the low temperature regenerator (12) for the absorbing liquid and the condenser (1
Refrigerant condensing temperature Tv_cond in 1) and cold water flow rate Vc
, Cold water outlet temperature Tc_out, and cold water inlet temperature Tc_
in and the cooling water inlet temperature Tco_in are measured, and these measured data are supplied to the arithmetic processing circuit (8) including a microcomputer.

The arithmetic processing circuit (8) is provided with a refrigerating load calculating section (84) for calculating the refrigerating load Lc by the following equation 11 from the cold water flow rate Vc, the cold water outlet temperature Tc_out and the cold water inlet temperature Tc_in.

[Equation 11] Lc = Vc × (Tc_in−Tc_out)

Further, the arithmetic processing circuit (8) is provided with an absorption liquid low temperature regenerator outlet temperature Ts_hi and a refrigerant condensing temperature Tv_con.
From d, a concentrated liquid concentration estimating unit (85) for calculating the concentrated liquid concentration Ds by the following equation 12 is provided.

[Equation 12] Ds = (Ts_hi + 280.0) × 139.0 / (Tv_cond + 27
3.0) -102.4

The above equation 12 is the saturated vapor temperature Tco of the upper shell in the conventionally known empirical equation of the equation 2.
Although the refrigerant condensing temperature Tv_cond is substituted as nd, the corrected refrigerant condensing temperature mTv_cond can be calculated and substituted as in the first embodiment.

Refrigeration load Lc obtained from the refrigeration load calculation unit (84) and cooling water inlet temperature Tc obtained from the sensor group (7)
o_in is supplied to the concentrated concentration normal value calculation unit (86),
The normal concentration Ds_n of the concentrated liquid is calculated. As shown by the solid line in FIG. 7, the normal concentration of concentrated liquid value calculation unit (86) has a plurality of different cooling water inlet temperatures, each of which has a different concentration curve representing the change in the normal concentration value with the refrigeration load as a variable. It is functionalized and stored as a parameter. The following Expression 13 is a quadratic approximation of the concentrated liquid concentration curve at a specific cooling water inlet temperature.

[0038]

[Equation 13] Ds_n = a × Lc ² + b × Lc + c Here, the constants a, b and c are determined by applying the least squares method to the actual measurement values shown in the graph of FIG. 7.

The normal concentration of concentrated liquid value calculating section (86) further stores a procedure for executing an interpolation process for an arbitrary cooling water inlet temperature Tco_in which is not included in the parameters. The normal value of the concentration of the concentrated liquid corresponding to the measured value is calculated with high accuracy.

As shown in FIG. 6, an evaluation value Ds_m of the concentrated liquid concentration calculated by the concentrated liquid concentration estimating unit (85) and a normal value Ds of the concentrated liquid concentration calculated by the normal concentration liquid concentration calculating unit (86).
_N is supplied to the concentrated concentration deviation calculation unit (87), and the concentration difference dDs between the two is calculated from the following equation (14).

DDs = Ds_m-Ds_n

The calculated density difference dDs is sent to the notification device (9), the following diagnostic data is created according to the magnitude of the density difference dDs, and is notified to the operation supervisor. dDs <t1: normal dDs> t1: attention to crystallization where t1 is a preset constant.

According to the above-described embodiment, it is possible to accurately detect an abnormality in the concentrated liquid concentration of the absorption chiller-heater regardless of the refrigerating load and the temperature of the cooling water. In particular, attention is paid to the crystallization of the absorbing liquid even when the load is low or the cooling water temperature is low, so in preparation for high load such as in summer, a preliminary inspection should be performed at an appropriate time to eliminate the cause of the abnormality. It is possible.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims. For example, when the data shown in FIGS. 3 to 5 and FIG. 7 is made into a function, not only a quadratic curve but an arbitrary regression curve can be adopted.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an abnormality determination device for an absorption chiller-heater according to the present invention.

FIG. 2 is a graph showing an excerpt of a part of a Duhring diagram.

FIG. 3 is a graph showing changes in the difference between the saturated steam temperature and the cooling condensing temperature with the cooling water inlet temperature as a variable.

FIG. 4 is a graph of the same as above, where the intermediate temperature of cooling water is used as a variable.

FIG. 5 is a graph of the same as above, where the cooling water outlet temperature is a variable.

FIG. 6 is a block diagram showing a second configuration example of the abnormality determination device.

FIG. 7 is a graph showing the relationship between the refrigerating load and the concentration of concentrated liquid with the cooling water inlet temperature as a parameter.

FIG. 8 is a diagram showing a configuration of an absorption chiller-heater.

[Explanation of symbols]

 (1) Upper body (11) Condenser (12) Low temperature regenerator (2) Lower body (21) Evaporator (22) Absorber (7) Sensor group (8) Arithmetic processing circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Yasuda 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. The temperature of the absorbing liquid flowing toward the absorber (22), the condensation temperature of the refrigerant in the condenser (11), and the temperature of the cooling water flowing in the absorber (22) and the condenser (11). The sensor means for detecting and the temperature correction data with the cooling water temperature as a variable, the temperature correction data corresponding to the difference between the saturated vapor temperature of the condenser (11) and the refrigerant condensing temperature are stored in advance in the storage means and the sensor means. Based on the obtained cooling water temperature, temperature correction data is derived from the storage means, and the temperature correction data corrects the refrigerant condensation temperature obtained from the sensor means, and the refrigerant corrected by the temperature correction means. Based on the condensing temperature and the absorption liquid temperature obtained from the sensor means, based on the concentration estimating means for estimating the concentration of the absorbing liquid (concentration of concentrated liquid) and the estimated value of the concentration of concentrated liquid obtained from the concentration estimating means, Abnormality to determine the occurrence of abnormality Abnormality determination device of an absorption chiller-heater equipped with a constant section. 2. The abnormality determining means comprises a calculating means for deriving a normal value of the concentrated liquid concentration based on the refrigeration load and the cooling water temperature, and the estimated value of the concentrated liquid concentration obtained from the concentration estimating means and the concentrated liquid. The abnormality determination device according to claim 1, wherein diagnostic data representing the degree of abnormality is created and output according to the magnitude of the difference from the normal value of the concentration. 3. Refrigeration load, absorber (22) and condenser (11)
A sensor means for detecting the temperature of the cooling water flowing through, a concentration detecting means for detecting the concentration (concentrated liquid concentration) of the absorbing liquid flowing toward the absorber (22) by measurement including actual measurement or estimation, and a refrigeration load and Based on the refrigeration load and the cooling water temperature obtained from the storing means and the storing means, the concentrated liquid concentration characteristic representing the change in the concentrated liquid concentration during normal operation is set based on the cooling water temperature as a variable. Computation means for deriving a normal value of the concentration of concentrated liquid from the concentration characteristic of concentrated liquid, means for comparing the concentration of concentrated liquid detected by the concentration detection means, and the normal value of concentration of concentrated liquid derived by the calculation means,
An abnormality determination device for an absorption chiller-heater, comprising: abnormality determination means for determining the occurrence of abnormality based on the comparison result. 4. The sensor means further detects the condensing temperature of the refrigerant in the condenser (11), and the concentration detecting means uses the cooling water temperature as a variable, and the saturated vapor temperature and the refrigerant condensing temperature of the condenser (11). The temperature correction data corresponding to the difference between the storage means and the storage means pre-stored, the temperature correction data is derived from the storage means based on the cooling water temperature obtained from the sensor means, and the refrigerant condensation temperature is derived from the temperature correction data. Based on the temperature correction means for correcting, the refrigerant condensation temperature corrected by the temperature correction means, and the absorption liquid temperature detected by the sensor means,
The abnormality determination device according to claim 3, further comprising concentration estimating means for estimating the concentration of the concentrated liquid.