JPH0625640B2 - Absorption chiller / heater diagnostic method - Google Patents

Description

The present invention relates to a method for diagnosing an absorption chiller-heater, and more particularly to a plurality of performance and failure points based on temperature information of various points of the chiller-heater in operation. The present invention relates to a suitable absorption chiller-heater diagnostic method for diagnosing.

[Conventional technology]

A conventional absorption chiller-heater of this type, as shown in FIG.
A high temperature regenerator 1 that introduces a dilute solution and heats it, a separator 2 that separates the high temperature steam heated by the high temperature regenerator 1 and boiled and an intermediate concentrated solution, and an intermediate that is separated by the separator 2. The concentrated solution is introduced into the high temperature side heat exchanger 9 through the inlet pipe 13, the temperature is lowered by heat exchange with the dilute solution in the high temperature side heat exchanger 9, and then the concentrated solution is introduced through the outlet pipe 14 and this introduction The intermediate concentrated solution thus prepared is heated by the high temperature steam taken into the refrigerant circuit 50 from the separator 2 to concentrate the intermediate concentrated solution and at the same time generate a refrigerant vapor, and the intermediate concentrated solution is heated from the low temperature regenerator 3. In the condenser 4 and the condenser 4, the liquid refrigerant that has been deprived of heat and condensed by the refrigerant vapor and the intermediate concentrated solution generated by taking in the liquid refrigerant is cooled and condensed by the cooling water flowing in the cooling water coil 601. Dispersed condensed refrigerant 70 and evaporator 5 for evaporating by spraying onto cold heat transfer coil 80 via the concentrated solution through the inlet pipe 15 from the low-temperature regenerator 3 to the low temperature side solution heat exchanger 8,
After introducing and lowering the temperature, the coil 60 is passed through the outlet pipe 16.
2 is sprayed on the evaporator 5 to absorb the refrigerant vapor evaporated in the evaporator 5 to form a diluted solution, and the diluted solution is sent from the absorber 6 to the heat exchangers 8 and 9 through the outlet pipe 10. , And a solution circulation pump 7 that sends the heat from the heat exchanger to the high temperature regenerator 1 via the outlet pipe 12, and these form a circulation system. In addition, 11 is a dilute solution outlet pipe, 22 is a fuel supply pipe,
Reference numeral 23 is an age controller, 24 is a combustion burner, and 25 is a flue.

By the way, conventionally, a person who was enthusiastic about the absorption chiller-heater measured and recorded the temperature, flow rate, pressure, or solution concentration of each part of the chiller-heater using various expensive measuring instruments, and recorded the temperature. Performance of chiller-heater,
We have conducted diagnostics such as failure points and the need for preventive maintenance.
For example, in diagnosing the refrigerating capacity, the temperature difference (dT) between the inlet pipe 20 and the outlet pipe 21 of the cold / hot water and the pressure loss (dP) are measured, and the obtained pressure loss is used to measure the individual pressures shown in FIG. Using the "Cold and hot water pressure loss characteristic" diagram that is unique to hot and cold water machines,
The flow rate (q) is graphically obtained, and the obtained flow rate (q) is multiplied by the previously measured temperature difference (dT) to obtain the refrigerating capacity (= q ×
dT) was sought. As a method for diagnosing the degree of vacuum, a pressure detector (compound meter, manometer, pressure sensor, etc.) is attached to the pressure detection valve of the evaporator 5 or the absorber 6, and the inside of the connecting pipe is evacuated. After that, the pressure detection valve was opened to guide the internal pressure of the hot and cold water machine, and the judgment was made from the value indicated by the detector. As another method, the refrigerant liquid temperature of the evaporator 5 is measured, and the saturated vapor pressure of the refrigerant is calculated (or plotted) from the temperature and the absorber outlet 10 of the absorbing liquid.
Obtained by calculating the saturated vapor pressure of the solution (or the solution diagram) from the temperature and its concentration (using a vacuum pump from the sampling valve), measuring the concentration, and measuring the concentration and temperature. The degree of vacuum was diagnosed by comparing with.

In addition, the mixed cooling capacity Q (kcal /
H) is calculated, and then the refrigerant generation amount D (kg / H) is calculated by the enthalpy difference h (kcal / kg) between the refrigerant vapor and the refrigerant liquid at the evaporator temperature at that time, and the refrigerant capacity Q (kcal / H). Divided by. That is, D = Q / h. On the other hand, the diluted solution and the concentrated solution are sampled from the main body of the cold / hot water machine, and the concentration Xd (%) of the diluted solution and the concentration Xc (%) of the concentrated solution are measured by a densitometer or the like. In the absorption chiller-heater, the relationship between the solution circulation amount G (kg / H), the refrigerant generation amount D (kg / H) and the concentrations Xd (%) and Xc (%) is G = [Xc / (Xc-Xd )] × D (kg / H), and the solution circulation amount was determined by substituting the value obtained above into the above equation.

Further, as one method for diagnosing the cold / hot water flow rate, the cold / hot water flow rate (q) is graphically obtained as described in the diagnosis of the refrigerating capacity. As another method, there is a method of measuring the flow rate (q) of cold / hot water with a flow meter, but in the conventional known technology, there are many cases where the flow meter is not installed. Even if they are installed in the water, if there are multiple hot / cold water heaters connected, there are few cases where a flow meter is installed in each cold / hot water heater, and even if the total flow rate is known, it is flowing to each machine. I do not know the flow rate. An ultrasonic flow meter is also conceivable, but it is not popular because it is expensive and not versatile.

Further, as one method for diagnosing the input, the secondary pressure of the supplied fuel was checked, and the secondary pressure was calculated by comparing it with the value indicated on the nameplate equipped with the chiller / heater. As another method, there is a method of measuring the consumed fuel amount by a fuel flow meter, but it has the same problem as described in the section of diagnosis of cold / hot water flow rate.

[Problems to be solved by the invention]

However, the conventional known techniques have the following problems.

(1) Work requires heat kneading.

(2) Highly accurate and expensive measuring equipment and equipment such as vacuum pumps are required. In addition, it is difficult to carry in and out these devices to the site.

(3) Since the valves (pressure detection, sample collection) of the refrigerator are opened and closed during work, there is a risk of breaking the vacuum.

(4) Generally, the solution of the absorption chiller-heater is highly corrosive, which may damage the equipment or cause corrosion (rust) due to the scattering of the solution during work.

(5) It is difficult to judge the stable state of the chiller / heater, and there is a possibility of making an incorrect judgment from incomplete data.

(6) In the absorption chiller-heater, the condition of each part is affected by several factors, and therefore one judgment factor easily causes an error in the diagnosis result.

(7) The time and cost required for inspection are large.

An object of the present invention is to make a judgment based on only the temperature information of the components of the water chiller / heater and the temperature of the pipe system connecting each element, and make a judgment based on a plurality of judgment elements, and weight each judgment element to derive a diagnosis result. It is to provide a method for diagnosing the chilled water heater.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is a detection means for detecting the temperature of the components of the absorption chiller-heater and the pipe system connecting each element, and the obtained signals (cooling water inlet temperature, cold / hot water outlet). Temperature value), a judgment value calculation means for calculating a judgment value for each judgment element necessary for diagnosis, an actual measurement calculation means for processing the signal to calculate an actual measurement value for each judgment element, a determined judgment value, an actual measurement Judgment element comparison means for comparing a plurality of judgment elements whose values are determined in advance by diagnostic items, weight addition means for adding weight amounts decided according to the result of comparison, weight comparison means for comparing the added weights, weight comparison The diagnostic result is derived from the result.

[Action]

According to the above configuration, temperature data of each part of the chiller / heater is taken in, and the operating state is determined based on this data. In the case of a transient state, the incorporation of data into the subsequent diagnosis processing means is blocked so that the diagnosis is not performed until stable operation is achieved. When a stable condition is reached, a standard judgment value for each judgment element that represents the ideal state of the chiller / heater at the present time is obtained from the cooling water inlet temperature and the cold / hot water outlet temperature, while the temperature data is processed and measured for each judgment element. Value is required. Then, after comparing the measured value with the judgment value, if the comparison result is abnormal, the weighting coefficient determined for each judgment element is added to the abnormal weighting coefficient, and if normal, to the normal weighting coefficient. From this addition result, the sum of normal weighting factors and the sum of abnormal weighting factors are compared, and the larger coefficient is output as the result of the diagnostic item.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a flowchart of the diagnostic method of the present invention. FIG. 2 shows a double-effect absorption type chiller / heater A according to the diagnostic method of the present invention.
It is a block diagram when implementing in. As shown in the figure, the cold / hot water machine A has temperature sensors S attached to its constituent elements, for example, the evaporator 54 and the pipe system connecting the respective elements, and the detection signals of the respective temperature sensors are input to the diagnostic device B. It

As shown in FIG. 3, the diagnostic device B includes an input unit 501 for A / D converting a detection signal from the temperature sensor S, a microcomputer 502 for performing a calculation necessary for diagnosis based on temperature data, and a key operation. The key input unit 503 for instructing change of the model of the water chiller / heater, diagnostic items, etc., the RAM 504 for temporarily storing the data of the processing process, the program necessary for the diagnosis and the data for each diagnostic item and for each model are stored. ROM 505, display circuit 506 for operating display 507, output unit 507 for outputting data to the outside
It consists of and.

Next, the diagnostic method of the present invention will be described. (See Fig. 1)
Key in the model (model) of the chiller / heater to be diagnosed before diagnosing. When a key for diagnosing is pressed, temperature data, which is a detection signal, is taken into the arithmetic unit at certain time intervals (for example, every 5 minutes) (step 100). For the taken data, the judgment value of each judgment element determined for each diagnostic item is obtained (step 110), and then the actually measured value is obtained (step 120). Here, the judgment value is a numerical representation of the state of the chiller / hot water machine, which should be the original condition, and is corrected by the cooling water inlet temperature (TCO1) and the cold / hot water outlet temperature (TCH2) of the obtained detection signals. And ask.

Jn = fKn * (TCO1, TCH2) where Jn is a judgment value and Kn is a coefficient for each element.

On the other hand, the actual measurement value is a value in which the obtained detection signal is expressed in the form of a temperature or a temperature difference for each judgment element.

The obtained actual measurement value and judgment value are compared in magnitude for each judgment element determined by the diagnostic item (step 130). If the comparison result is abnormal, the abnormal weighting coefficient is added to the abnormal weighting coefficient, and the normal weighting coefficient is added to the normal weighting coefficient (step 140). Based on the addition result, the total of normal weighting factors and the total of abnormal weighting factors are compared, and the larger coefficient is output as the result of the diagnostic item (step 150). This diagnostic result is displayed on the display screen by the display 507, and an alarm is issued if necessary.

FIG. 4 shows an example of diagnosis of the refrigerating capacity and the input of the double-effect absorption chiller-heater.

The temperature detection sensor S includes a cooling water inlet pipe 17, a cooling water absorber outlet pipe 18, a cooling water outlet pipe 19, a hot and cold water inlet pipe 20,
It is attached to each of the cold / hot water outlet pipe 21, the evaporator 5, and the exhaust gas smoke pipe 25 to obtain temperature information.

In the absorption chiller-heater, when the refrigerating capacity decreases, the temperature difference between the hot and cold water inlet and outlet (DTCH = TCH1-TCH2) becomes small. As the refrigerant evaporation amount in the evaporator 5 decreases, the absorption heat amount in the absorber 6 decreases, and the cooling water absorber inlet / outlet temperature difference (DT
COA = TCO2-TCO1) becomes small. Removal heat quantity (Qa) in the absorber 6 and removal heat quantity (Q
c) (R = Qc / Qa = (TCO3-TCO2)
/ (TCO2-TCO1)) becomes large. Evaporator temperature (TE) is typically higher. The above four phenomena are used as the judgment factors for the refrigeration capacity diagnosis.

On the other hand, the increase / decrease in the input appears as the increase / decrease in the refrigeration capacity and the increase / decrease in the amount of heat removed to the cooling water.
1), cooling water condenser inlet / outlet temperature difference (DTCOC = TC
O3-TCO1), cold / hot water inlet / outlet temperature difference (DTCH =
The four of TCH1-TCH2) are used as the judgment elements of the input diagnosis.

Judgment values (J1, J2, J3, J4, J5a, J5b, J6) are obtained from the temperature information obtained for each of these judgment elements.
a, J6b, J7a, J7b, J8a, J8b), measured values (DTCH, DTCOA, R, TE, DTCO, DT)
COC). Here, the actual measurement value is obtained by processing the obtained temperature information for each judgment element into a temperature, a temperature difference, a ratio of the temperature difference, and the like. On the other hand, the judgment value is corrected by a calculation formula obtained in advance from the cooling water inlet temperature (TCO1), the cold / hot water outlet temperature (TCH2), and the combustion state (N),
This is a value obtained by numerically determining the normal state of the chiller / heater in consideration of the tolerance and determining each judgment element.

If each judgment value is Jn, Jn = fKn (TCO1, TCH2, N) ± An where Kn is a constant. An is an allowable value. n is a parameter of the judgment element. Next, a comparison is made for each judgment element.

<Diagnosis of refrigerating capacity> First, J1 and DTCH are compared, and if J1> DTC
If H, it is suspected that the refrigerating capacity is lowered, so the coefficient ELC (E
LC adds the weight W1C to the coefficient of reduction in refrigeration capacity).
If J1 ≦ DTCH, it is considered that there is a refrigerating capacity, so the weight W1C is added to the coefficient EGC (EGC is a coefficient with a refrigerating capacity). Subsequently, J2 is compared with DTCOA, and if J2> DTCOA, it is suspected that the refrigerating capacity is deteriorated, so the weight W2C is added to the coefficient ELC. If J2 ≦ DTCOA, it is considered that there is a refrigerating capacity, so the weight W2C is added to the coefficient EGC. continue,
By comparing J3 and R, if J3 <R, it is suspected that the refrigerating capacity is deteriorated. Therefore, the coefficient ELC is weighted W3C is weighted W3.
Add C. If J3 ≧ R, it is considered that there is a refrigerating capacity, so the weight W3C is added to the coefficient EGC.
Subsequently, J4 is compared with TE, and if J4 <TE, it is suspected that the refrigerating capacity is deteriorated, so the coefficient ELC is weighted by W4.
Add C. If J4 ≧ TE, it is considered that there is a refrigerating capacity, so the weight W4C is added to the coefficient EGC. Finally, even if the total value of ELC and the total value of EGC are compared, if ELC> EGC, there is a high possibility that the refrigerating capacity is deteriorated. On the contrary, if EGC ≧ ELC, it is determined that there is a refrigerating capacity.

<Input Diagnosis> J5a and DTCO are compared, and if DTCO> J5a, it is suspected that there are many inputs, so the weight W1I is added to the coefficient EHI (EHI is a coefficient of excessive input). Also, comparing J5b and DTCO, if DTCO <J5b, there is doubt that there is little input, so the coefficient ELI (EL
I is the coefficient of input shortage) and the weight W1I is added.

If J5a ≧ DTCO ≧ J5b, it is determined that the input is appropriate and the coefficient EGI (EGI is the coefficient for the input appropriate)
W1I is added to.

Then, comparing J6a and DTCOA, DTCOA>
If it is J6a, it is suspected that there are many inputs, so the coefficient EH
The weight W2I is added to 1. Further, J6b is compared with DTCOA, and if DTCOA <J6b, it is suspected that the input is small, so the weight W2I is added to the coefficient EL1.
If J6a ≧ DTCOA ≧ J6b, it is determined that the input is appropriate and W2I is added to the coefficient EGI.

Then, comparing J7a and DTCOC, DTCOC>
If it is J7a, it is suspected that there are many inputs, so the coefficient EH
The weight W3I is added to I. Also, comparing J7b and DTCOC, if DTCOC <J7b, it is suspected that the input is small, so the weight W3I is added to the coefficient ELI.
If J7a ≧ DTCOC ≧ J7b, it is determined that the input is appropriate and W3I is added to the coefficient EGI.

Subsequently, the determination based on the difference between the hot and cold water inlet and outlet temperatures (DTCH) is affected by the refrigerating capacity. Therefore, the ratio between the heat of absorption removal to the cooling water and the heat of condenser removal described above (R = TCO3-T
CO2) / TCO2-TCO1) is taken into consideration. That is, only when J3 ≧ R, J8a and DTCH are compared, and if DTCH> J8a, it is suspected that there are many inputs, so the weight W4I is added to the coefficient EHI. See J
8b and DTCH are compared, and if DTCH <J8b, it is suspected that the input is small, so the weight W4 is added to the coefficient ELI.
Add I. If J8a ≧ DTCH ≧ J8b, it is determined that the input is appropriate and W4I is added to the coefficient EGI.

Finally, ELI, EHI, and EGI are compared to determine the input diagnostic result with the largest coefficient.

<Diagnosis of Solution Circulation Volume> FIG. 5 shows an example of diagnosis of the solution circulation volume of the absorption type absorption chiller-heater. If the operation is normal, IH (T
The heat exchanger temperature efficiency (IH) defined by the formula Y4-TY5) / (TY4-TY2) falls within a certain range.
(Here, TY2, TY4, and TY5 are detected temperatures in the outlet pipe 11, the inlet pipe 13, and the outlet pipe 14). However, for some reason in the absorption chiller / heater, for example, a malfunction of the solution circulation pump, or abnormal concentration of the solution (crystal breakage of the solution)
When the solution circulation becomes abnormal due to such factors as temperature efficiency (I
H) decreases. Focusing on this point, the solution circulation amount diagnosis of the present invention first calculates the temperature efficiency (IH) from the detected temperature. Next, the temperature efficiency (IH) obtained by the calculation is compared with a preset normal data value (J1),
If IH <J1, there is a lot of suspicion that the solution circulation amount is poor, so it is judged that the solution circulation amount is abnormal as a diagnosis result. For example, in the case of a liquid crystal screen, "Solution circulation amount defect" is displayed or a lamp is displayed. In such a case, the lamp can be turned on and an alarm can be issued. If the solution circulation rate is abnormal, use that signal to stop the water heater and
It is possible to avoid problems caused by poor solution circulation. On the contrary, if IH ≧ J1, it is determined that the solution circulation amount is normal.

<Diagnosis of Cold / Hot Water Flow Rate> FIG. 6 shows an example of diagnosis of the cold / hot water flow rate of the absorption chiller / heater. If the refrigeration capacity is constant if the cold / hot water flow rate (FCH) changes, the cold / hot water inlet / outlet temperature difference (DTCH = TCH1
-TCH2, where TCH1 is the cold / hot water inlet temperature, TCH
2 is the cold / hot water outlet temperature) and is inversely proportional to the flow rate (FCH) (DTCH ← 1 / FCH). However, since the determination factor based only on the difference between the hot and cold water inlet and outlet temperatures (DTCH) is affected by the change in the refrigerating capacity and a diagnostic error is likely to occur, the refrigerating capacity is first diagnosed and the diagnostic result is used as another determining factor.

The hot and cold water inlet / outlet temperature difference (DTC
H), and the judgment value (J1, J2, J3, J4, J5
a, J5b) and measured values (DTCH, DTCOA, R, T
Compare with E).

First, comparing J5b and DTCH, DTCH> J5
If b, it is suspected that the flow rate of cold and hot water is insufficient, so the coefficient ELF
The weight W1F is added to (ELF is a coefficient of insufficient flow rate of cold / hot water). Then, compare J5a and DTCH, and if DT
If CH <J5a, it is suspected that the flow rate of cold / hot water is excessive. Therefore, the coefficient EHF (EHF is a coefficient of flow rate of cold / hot water) is weighted by W1.
Add F. If J5a ≦ DTCH ≦ J5b, it is considered that the cold / hot water flow rate is appropriate, so the weight W1F is added to the coefficient EGF (EGF is a coefficient for the cold / hot water flow rate is appropriate).

Next, the results obtained by the above-mentioned refrigerating capacity diagnosis are linked and compared. When there is a difference in temperature between the hot and cold water inlets and outlets despite no refrigerating capacity, that is, ELC> EGC and J5a ≦ D
If TCH ≦ J5b, it is suspected that the cold / hot water flow rate is insufficient, so the weight W2F is added to the coefficient ELF. When there is a refrigerating capacity and there is a difference between the hot and cold water inlet and outlet temperatures, that is, ELC ≤ EGC
If J5a ≦ DTCH ≦ J5a, it is considered that the cold / hot water flow rate is appropriate. Therefore, the weight W2F is added to the coefficient EGF. If there is a refrigerating capacity and there is no difference between the hot and cold water inlet and outlet temperatures,
That is, if ELC ≦ EGC and DTCH <J5a, it is considered that the flow rate of cold / hot water is too large, so the weight W2F is added to the coefficient EHF.

Finally, the above three coefficients (ELF, EGF, EHF) are compared, and the coefficient with the largest value is used as the diagnosis result of the cold / hot water flow rate. As in the case of diagnosing the solution circulation amount, the result can be displayed on the liquid crystal screen as "insufficient cold / hot water flow rate" or a lamp can be turned on to give an alarm. Further, if the value of the weight added to the diagnosis result in the diagnosis process is used, the stochastic expression of the diagnosis accuracy can be obtained.

<Vacuum Degree Diagnosis> FIG. 7 shows an example of the vacuum degree diagnosis of the absorption chiller-heater. When the degree of vacuum decreases, the vapor pressure of the evaporator 5 rises, the evaporator temperature (TE) rises, and the cold / hot water outlet temperature (TCH
2), the temperature difference (DE = TCH2-T)
E) becomes smaller. In a cold / hot water machine without a refrigerant pump, the amount of refrigerant evaporated in the evaporator 5 is reduced, and the corresponding amount of the refrigerant liquid mixes with the absorbing liquid to generate dilution heat. This heat raises the temperature (TY1) of the dilute solution leaving the absorber 6 without the opportunity to be wasted into the cooling water. Therefore, the temperature of the diluted solution absorber outlet (T
Y1) and cooling water inlet temperature (TCO1) temperature difference (DA =
TY1-TCO1), and diluted solution absorber outlet temperature (TY
1) and the temperature difference (DA1) between the cooling water outlet temperature (TCO3)
= TY1-TCO3), the degree of vacuum diagnosis can be performed using the above three determination factors.

Judgment values (J1, J2, J3) and measured values (DE, DA, D) are obtained from the temperature information obtained for each of these judgment elements.
Find A1). Next, the judgment value for each judgment element and the measured value are compared.

First, J1 is compared with DE, and if DE <J1, it is suspected that the degree of vacuum is lowered, so the weight W1V is added to the coefficient ELV (ELV is a coefficient of vacuum degree reduction). If DE ≧ J1, the degree of vacuum is considered to be good, so the coefficient EGV (EGV
Is a coefficient of good vacuum) and a weight W1V is added. Subsequently, J2 is compared with DA, and if DA> J2, it is suspected that the degree of vacuum is lowered, so the weight W2V is added to the coefficient ELV. If DA ≦ J2, the degree of vacuum is considered to be good, so the weight W2V is added to the coefficient EGV. Then, J3
And DA1 are compared with each other, and if DA1> J3, it is suspected that the degree of vacuum is lowered. Therefore, the weight W3V is added to the coefficient ELV. If DA1 ≦ J3, the degree of vacuum is considered to be good, and the weight W3V is added to the coefficient EGV. Finally, ELV and EGV are compared and a vacuum degree diagnosis result is obtained with a large coefficient. Then, the result can be displayed as "vacuum defect" in the case of a liquid crystal screen as described above, or the corresponding lamp can be turned on in the case of a lamp display. Further, if the value of the weight added to the diagnosis result in the diagnosis process is used, the stochastic expression of the diagnosis accuracy can be obtained.

It should be noted that, when the diagnosis of the decrease in the degree of vacuum is made, the signal can be used to operate the bleeding device. Further, in a water heater having a refrigerant pump, the dilute solution and the refrigerant solution are not mixed due to the decrease of the refrigerant evaporation amount in the evaporator 5, and the absorption heat in the absorber 6 is simply reduced. Therefore, contrary to the above, the outlet temperature (TY1) of the diluted solution absorber decreases. As described above, the diluted solution absorber outlet temperature (TY1) exhibits the opposite phenomenon depending on whether the refrigerant pump is provided or not, so that diagnosis can be performed by reversing the determination. That is, in a chiller-heater having a refrigerant pump, the determination signs of the vapor determination elements DA and DA1 may be reversed.

As described above, the diagnosis method of the present invention compares the judgment values and the actual measurement values of a plurality of judgment factors to perform one diagnosis item, and if the comparison result is abnormal, the weighting coefficient of the abnormality is used. The weight amount determined for each determination element is added to the normal weight coefficient (or to the appropriate weight coefficient that is large, small, or appropriate). From this addition result, the sum of normal weight coefficients and the sum of abnormal weight coefficients are compared, and the larger coefficient is used as the result of the diagnostic item (or the sum of the larger weight coefficients and the smaller weight coefficients). And the sum of the appropriate weighting factors are compared, and the highest weighting factor is used as the result of the diagnostic item). These weightings (determination of weighting amount) can be obtained by using the rate of change of each judgment factor from the experimental data that has been done in advance, or by using a simulation model of a chiller / heater when experiments are difficult. You can do it by the method you ask

As an example, a weighting method for cooling water flow rate diagnosis will be described. There are three judgment factors for the cooling water flow rate diagnosis: the cooling water inlet / outlet temperature difference (DTCO = TCO3-TCO1), the diluted solution absorber outlet temperature (TY1) and the cooling water inlet temperature (TCO).
1) temperature difference (DA = TY1-TCO1), diluted solution absorber outlet temperature (TY1) and cooling water outlet temperature (TCO)
3) and the temperature difference (DA1 = TY1-TCO3).
Table 1 (a) shows the experimental data of the respective changes in the cooling water flow rate changes of these three elements.

Each change rate (ΔTi = dΔti / dFCO) with respect to the change in the cooling water flow rate is obtained from these data, and the weight amount Wi = (ΔTi / ΣΔTi) × of each element is obtained from each obtained change rate.
Ask for 100. Here, the subscript i is the i-th judgment element,
dΔti is the change amount of the determination factor, ΔFCO is the change amount of the cooling water flow rate, and ΔTi is the change rate.

Specifically, from the data in Table 1 (a), 3 of cooling water flow rate diagnosis
When the weight amount for each of the determination factors is calculated, the weight amount W1 of the determination factor for the cooling water inlet / outlet temperature difference (DTCO) is dΔt1 =
From 7.6, ΔT1 = 0.076, ΣT1 = 0.191, W1 = 40. Similarly, dilute solution absorber outlet temperature (TY
Temperature difference (DA) between 1) and cooling water inlet temperature (TCO1)
The weight amount W2 of the determination element is W2 = 39, and the weight amount W of the determination element of the temperature difference (DA1 = TY1-TCO3) between the diluted solution absorption outlet temperature (TY1) and the cooling water outlet temperature (TCO3).
3 has W3 = 21 (see Table 1 (b)).

Next, a weighting method for vacuum degree diagnosis will be described. As described above, there are three judgment factors for the vacuum degree diagnosis, that is,
Temperature difference between cold / hot water outlet temperature (TCH2) and evaporator temperature (TE) (DE = TCH2-TE), temperature difference between dilute solution absorber outlet temperature (TY1) and cooling water inlet temperature (TCO1) (DA = TY1) -TCO1), a temperature difference (DA1 = TY1-TCO3) between the diluted solution absorption outlet temperature (TY1) and the cooling water outlet temperature (TCO3). Table 2 (a) shows the experimental data of the respective changes in the vacuum degree of these three elements.

From these data, the rate of change (ΔT
i = dΔti / dmol) is calculated, and each weight amount Wi = (ΔTi / ΣΔTi) × 100 is calculated from the calculated change rate. Specifically, from the data in Table 2 (a), 3 of vacuum degree diagnosis
When the weighted amount for each of the determination factors is obtained, the temperature difference (DE) between the cold / hot water outlet temperature (TCH2) and the evaporator temperature (TE)
The weighting amount W1 of the determination element is dΔt1 = 2.7, ΔT1
= 0.343 and ΣΔT1 = 2.48, W1 = 14. Similarly, the weight amount W2 of the determination factor of the temperature difference (DA) between the diluted solution absorber outlet temperature (TY1) and the cooling water inlet temperature (TCO1) is W2 = 40, and the diluted solution absorber outlet temperature (TY).
1) and the temperature difference (DA1) between the cooling water outlet temperature (TCO3)
= TY1-TCO3), the weight amount W3 of the determination factor is W3 =
46 (see Table 2 (b)).

Note that the temperature change (Δ
When the element of t) and the element of temperature efficiency (η = Δt / Δt) coexist, the dimensioning is different, which causes inconvenience in weighting. In this case, the numerator or denominator for which the temperature efficiency is calculated has a larger temperature change. Then, the dimension of each element may be the same and weighting may be performed. As an example thereof, a weighting method for refrigerating capacity diagnosis will be described.

There are four judgments for the refrigerating capacity diagnosis as described above, and the ratio (R = Qc / Qa = (Evaporator temperature (TE), the ratio of heat removed by the absorber (Qa) to the cooling water) and the heat removed by the condenser (Qc) (R = Qc / Qa = ( TC
O3-TCO2) / (TCO2-TCO1)), cold / hot water inlet / outlet temperature difference (DTCH), cooling water absorber inlet / outlet temperature difference (DTCOA = TCO2-TCO1). The quantity of heat removed by the absorber to the cooling water (Q
The ratio R between a) and the amount of heat removed by the condenser (Qc) may be determined as the rate of change by taking the larger denominator or numerator temperature change because the dimensions of the other three determination factors are different.

Also, if it is difficult to find the tendency of the judgment factor in experiments, it is difficult to find it due to the effect of dirt on the heat transfer surface of the heat exchanger (cooling water coil, hot / cold water coil, solution heat exchanger). It can be obtained by using a simulation model of a chiller / heater. As an example, in order to obtain the weight of the cooling water coil contamination diagnosis in Table 3 (a), the condenser temperature (TC) and the cooling water outlet temperature (TCO3), which are the judgment factors of the cooling water coil contamination diagnosis, are shown. Temperature difference (DC = TC-TCO3), dilute solution absorber outlet temperature
(TY1) and cooling water inlet temperature (TCO1) temperature difference (DA
= TY1-TCO1), diluted solution absorber outlet temperature (TY
1) and the temperature difference (DA1) between the cooling water outlet temperature (TCO3)
= TY1-TCO3), the temperature difference between the condenser temperature (TC) and the cooling water inlet temperature (TCO1) (DC1 = TC = TC
The simulation result of the change amount with respect to the cooling water coil dirt of O1) is shown. Based on the obtained result, weighting may be performed for each judgment element as in the above method. The obtained weighting results are shown in Table 3 (b).

[Advantages of the Invention] As described above, according to the present invention, only one piece of temperature information of the chiller-heater is used to make a judgment based on a plurality of judgment factors for one diagnosis, and each judgment factor is weighted to derive a diagnosis result. Therefore, diagnostic accuracy is high, stochastic expression is possible, and inspection efficiency is improved.

[Brief description of drawings]

FIG. 1 is a flowchart of the diagnostic method of the present invention, FIG. 2 is a diagram showing application to a known double-effect absorption chiller-heater, and FIG.
FIG. 4 is a block diagram of a diagnostic device, FIG. 4 is a flowchart of refrigerating capacity and input diagnosis of the chiller-heater of FIG. 2, and FIG. 5 is a flowchart of solution circulation amount diagnosis of the chiller-heater of FIG.
FIG. 6 is a flowchart of cold / hot water flow rate diagnosis of the second cold / hot water machine, FIG. 7 is a flowchart of vacuum degree diagnosis of the second cold / hot water machine, and FIG. 8 is a cold / hot water pressure loss characteristic diagram.

Claims (1)

[Claims] 1. A detection means for detecting the temperature of a constituent element of an absorption chiller-heater and a pipe system connecting each element, and a diagnosis by correcting from the obtained signals (cooling water inlet temperature, cold / hot water outlet temperature). Judgment value calculation means for calculating a judgment value for each necessary judgment element, actual measurement value calculation means for processing the signal to calculate the actual measurement value for each judgment element, the determined judgment value, the actual measurement value is determined in advance by the diagnostic item. Judgment element comparison means for comparing a plurality of judgment elements, weight addition means for adding a weight amount determined according to the result of comparison, weight comparison means for comparing the added weights, and deriving a diagnosis result from the result of weight comparison A method for diagnosing an absorption chiller-heater characterized by.