JPH0697126B2 - Absorption chiller / heater diagnostic device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a diagnostic apparatus for an absorption chiller-heater, and 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 diagnostic device for an absorption chiller-heater suitable for diagnosing.

[Conventional technology]

A conventional absorption chiller-heater of this type, as shown in FIG.
A high temperature regenerator 1 for introducing a dilute solution and heating it, a separator 2 for separating high temperature steam heated by the high temperature regenerator 1 and boiling and an intermediate concentrated solution, and a separator 2 The intermediate 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 intermediate concentrated solution is introduced through the outlet pipe 14. A low temperature regenerator 3 for heating the introduced intermediate concentrated solution from the separator 2 by the high temperature steam taken into the refrigerant circuit 50 to condense the intermediate concentrated solution and at the same time generate a refrigerant vapor, and a low temperature regenerator 3
A condenser 4 that takes in the liquid refrigerant that has been deprived of heat by the refrigerant vapor generated by heating the medium-concentration solution and the medium-concentration solution and condensed it, and cools and condenses it by the cooling water flowing in the cooling water coil 601. An evaporator 5 for evaporating and condensing the refrigerant condensed in the condenser 4 onto the cold water heat transfer coil 80 through the dispersion part 70, and the low temperature regenerator 3 to the inlet pipe 15
The concentrated solution is introduced into the low temperature side solution heat exchanger 8 via the to cool the solution, and then sprayed on the coil 602 via the outlet pipe 16 to absorb the refrigerant vapor evaporated in the evaporator 5 and Absorber 6 as a solution, and a solution circulation pump that sends the dilute solution from absorber 6 to heat exchangers 8 and 9 via outlet pipe 10 and from this heat exchanger to high temperature regenerator 1 via outlet pipe 12. 7 and 7, which form a circulatory system. In addition, 22 is a fuel supply pipe, 23 is a fuel controller, 24 is a combustion burner, and 25 is a flue.

By the way, conventionally, a person who is familiar with the absorption chiller-heater measures the temperature, flow rate, pressure, or solution concentration of each part of the chiller-heater using various expensive measuring instruments, and records the temperature. The performance of the chiller / heater depends on the machine's instruction manual and experience.
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) and the pressure loss (dP) between the cold and hot water inlet pipe (20) and the outlet pipe (21) are measured, and the sixth is determined from the obtained pressure loss. The flow rate (q) is graphically determined using the "Cold / hot water pressure loss characteristic" diagram unique to each chiller / heater shown in the figure, and the calculated flow rate (q)
And the temperature difference (dT) measured previously are multiplied to obtain the refrigerating capacity (= q
XdT) 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 detecting valve of the evaporator (5) or the absorber (6), and the inside of the connecting pipe is attached. After evacuating, 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 a diagram) from that temperature and the absorber outlet (10) temperature of the absorbing liquid. Then, the solution was sampled (using a vacuum pump from the sample valve) to measure the concentration, and the saturated vapor pressure of the solution was calculated from the concentration and temperature (or the diagram of the solution). The degree of vacuum was diagnosed by comparing.

[Problems to be solved by the invention]

However, the conventional known techniques have the following problems.

(1) Work requires skill.

(2) Highly accurate and expensive measuring equipment and equipment such as vacuum pumps are required. In addition, the delivery of those devices to the site
Carrying out is difficult.

(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) In general, the solution of the absorption chiller-heater is highly corrosive, which may damage the equipment or cause corrosion (rust) due to 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 unsafe data.

(6) In the absorption chiller-heater, the state of each part is affected by several factors, and 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 provide a chiller-heater diagnosing device that enables various diagnoses based only on temperature information of components of the chiller-heater and pipe systems connecting the respective components.

[Means for solving problems]

In order to achieve the above object, the diagnostic device for an absorption chiller-heater of the present invention is a regenerator, a condenser, which constitutes the absorption chiller-heater,
An evaporator, a detector that detects the temperature of the components such as the absorber and the pipe system that connects each element, and a stability determiner that determines the stable state of the water chiller from the signal obtained by the detector,
As a result of the stability judgment, if the cold / hot water machine is in a transient state, a blocking unit that blocks the diagnosis, among the signals obtained by the detection unit, the inlet temperature of the cooling water flowing into the absorber, the outlet of the cold / hot water flowing out from the evaporator A judgment value calculation unit that corrects the temperature and the temperature of the exhaust gas discharged from the regenerator to calculate the judgment value for each judgment element necessary for each diagnosis, and the judgment value calculation unit that processes the signal obtained by the detection unit An actual measurement value calculation unit that calculates the actual measurement value, a determination element comparison unit that compares the determined determination value and the actual measurement value for each of multiple determination elements that are determined by diagnostic items, and a weight that weights the result of the comparison for each determination element. The addition unit, the weight comparison unit that sorts and compares the weighted comparison results normally or abnormally, the display unit that displays the diagnosis results that are normally or abnormally sorted and compared, and the Settings and display An operation unit for the operation, is intended to include a.

[Action]

According to the above configuration, the temperature data of each part of the chiller-heater is fetched, and the operating condition is judged by the stability judging part based on this data. In this case, in the case of a transient state, the diagnosis blocking unit prohibits data acquisition to the subsequent diagnosis processing means so that diagnosis is not performed until stable operation is achieved. When the stable state is reached, the judgment value calculation unit finds the judgment value for each standard judgment element that represents the ideal state of the chiller-heater at the present time based on the cooling water inlet temperature, the cold / hot water outlet temperature, and the exhaust gas temperature, and then calculates the measured value. In the section, the temperature data is processed to obtain an actual measurement value for each judgment element. Then, the judgment value and the measured value are compared by the judgment element comparison unit for each disconnection element, the result of the comparison for each judgment element is weighted by the weight addition unit, and the weighted comparison result is normal or abnormal by the weight comparison unit. The results of the diagnosis are displayed on the display unit.

〔Example〕

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

FIG. 1 is a block diagram constituting a diagnostic device of the present invention. FIG. 2 is a configuration diagram when the diagnostic device of the present invention is applied to a double-effect absorption chiller-heater A. As shown in the figure, in the chiller / heater A, temperature sensors S are attached to constituent elements, for example, the evaporator 4 and a pipe system connecting the respective elements,
The detection signal of each temperature sensor is input to the diagnostic device B. As shown in FIG. 3, the diagnostic device B includes a display unit 401 such as a liquid crystal panel for displaying the measured temperature and the diagnostic result on the operation surface.
And a key operation unit 402 for changing the diagnostic items and display contents, and instructing the model of the chiller / heater to be diagnosed, the connection unit 405 of the temperature sensor S on the back side and the connector for transferring the diagnostic data to the outside. It is provided and is configured to be portable and portable. The diagnostic data is used for centralized management of a plurality of water coolers by using a telephone line or the like.
Further, the diagnostic device B includes a detection unit 100 that detects the temperature information of the components of the water chiller / heater obtained by each temperature sensor S and the pipe system that connects the respective components, and an input unit 110 that receives the temperature detection signal.
And a stability determination unit 120 that determines whether or not the operating state of the water heater is transient based on the temperature information,
A diagnosis blocking unit 130 that takes in temperature information to instruct the execution of diagnosis and a combustion state determination unit 140 that determines the combustion state based on the exhaust gas temperature on condition that the water heater is in a stable operation state.
And the judgment value by the combustion state judgment unit and the cold / hot water outlet temperature and the cooling water inlet temperature are used to correct the numerical value for each predetermined judgment factor for each model to determine the judgment value as the diagnostic reference for the cold / hot water machine to be diagnosed. Judgment value calculation unit 150 for each judgment element, measured value calculation unit 160 for obtaining temperature information or temperature difference for each judgment element, comparison unit 170 for comparing judgment value and actual measurement value for each judgment element, comparison Weight adder 180 for weighting results
A weight comparison unit 190 that compares the weights of normal and abnormal weights to obtain a diagnosis result, a diagnosis result display unit 200 that displays an evaluation for each judgment element, and a judgment element for each predetermined model type. And a model setting unit 220 for setting the model of the chiller / heater.

Next, the operation of the present invention will be described. Before diagnosing, the model (model) of the hot and cold water machine that is first diagnosed by the model setting unit 220
Key in. When the model is entered, the constant storage section
From 210, constants related to the model of the chiller / heater are selected. When a key prompting diagnosis is pressed, the detection signal A / D converted by the input unit 110 is taken into the calculation unit at a certain time interval (for example, every 5 minutes). The stability determination unit 120 determines whether the transient state of the operating condition of the chiller / heater is stable based on the detection signal taken in. In the transient state, the temperature distribution of the chiller-heater is unstable, so diagnosis is not performed and the process waits until the next signal is input. When the stable state is determined, the combustion state of the chiller-heater is detected from the exhaust gas temperature in the detection signal, and the constant relating to the combustion state is selected from the constant storage unit 210 based on this.

Next, the judgment values and the actual measurement values of the judgment elements determined for each diagnostic item are calculated by the respective calculation units 150 and 160. Here, the judgment value is
The original state of the chiller / heater is quantified for each judgment factor, and the cooling water inlet temperature (TC0
1), corrected by hot / cold water outlet temperature (TCH2) and combustion state (N).

Jn = fKn * (TC01, TCH2, N) where Jn is the judgment value and Kn is the 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 comparator 170 compares the obtained measured value and judgment value with each other for each judgment element determined by the diagnostic item. Then, the weight addition unit 180 adds the weight amount determined for each determination element to the abnormal weight coefficient when the comparison result is abnormal and the normal weight coefficient when the comparison result is normal. Based on this addition result, weight comparison section 190 compares the sum of normal weight coefficients with the sum of abnormal weight coefficients and outputs the larger coefficient as the result of the diagnostic item. The diagnosis result is displayed on the display screen by the display unit 200, and an alarm is issued if necessary.

Also, when there is a request from an external personal computer, the request data is sent to the external output port for transfer.

FIG. 4 is an example of a specific refrigerating capacity diagnosis of the cooling / heating machine. When the refrigerating capacity decreases, the temperature difference between the hot and cold water inlet and outlet (DT
CH = TCH1-TCH2) becomes smaller. As the refrigerant evaporation amount in the evaporator decreases, the absorption heat amount in the absorber decreases, and the cooling water absorber inlet / outlet temperature difference (DTCOA = TC02-TC01) becomes smaller.
Heat removal (Qa) at absorber and heat removal (Qc) at condenser
Ratio (R = Qc / Qa = (TC03-TC02) / (TC02 / TC01))
Grows larger. Note that TC03 is the temperature of the cooling water at the outlet of the condenser 4. Evaporator temperatures are generally higher. Above 4
The measured value and the judgment value for each of these elements are obtained from the detection signals obtained using the two phenomena as the judgment elements, and the magnitudes are compared. At this time, the amount of weight is determined in advance for the above four determination factors from the degree of influence of the reduction in refrigerating capacity and added to the corresponding coefficient according to the comparison result. Finally, the total value of the respective coefficients (coefficient with capacity and coefficient without capacity) is compared, and the larger coefficient is used as the diagnosis result, and for example, "cooling capacity drop" is displayed on the display screen.

Next, another embodiment of the present invention will be described.

FIG. 5 is a configuration diagram when a microcomputer performs functions such as stability determination, diagnosis prevention, combustion state determination, determination value and actual value calculation, and comparison.

As shown in FIG. 5, the diagnostic device includes an input unit 501 for A / D converting a detection signal from a temperature sensor, and a microcomputer 502 for performing calculation necessary for diagnosis based on temperature data.
And a key input unit 503 for A / D converting the signal operated by the key
A RAM 504 for temporarily storing data of a process, a ROM 505 in which a program necessary for diagnosis and data for each diagnostic item or model type are stored, a display circuit 506 for operating the display unit 401, and data externally. And an output unit 507 for outputting to.

〔The invention's effect〕

As described above, according to the present invention, it is possible to determine the normality and abnormality of a plurality of determination elements such as the refrigeration capacity from the temperature information of the predetermined components of the chiller / heater and the pipe system connecting the respective components. The effect of is expected.

(1) Even a person who does not have knowledge of a water heater can easily make a diagnosis.

(2) Since the data for each model is stored in the storage unit in advance, it can be applied to various types of water heaters.

(3) Avoid diagnosing the transient state of the chiller / heater, have multiple judgment factors for one diagnostic item, and correct the reference value as the judgment value by the cooling water inlet temperature, the chilled water outlet temperature, and the exhaust gas temperature. However, since the result of comparison between the judgment value and the actually measured value is weighted by experience to make a comprehensive diagnosis, it is possible to make a diagnosis with high accuracy.

(4) Since the diagnosis result is displayed on the liquid crystal display screen, appropriate and detailed information can be obtained and correct processing can be performed. As a result, the chiller-heater can be secured in an appropriate state, and the chiller-heater can be operated with the highest efficiency, and economical running costs can be expected. In addition, it is possible to avoid excessive stress on the chiller / heater, which extends the life of the chiller / heater.

(5) The device can be reduced in size and weight.

[Brief description of drawings]

FIG. 1 is a block diagram of a diagnostic device of the present invention, and FIG.
Figure is a diagram for explaining the application to a known double-effect absorption chiller-heater, and Figure 3 is an external view of the diagnostic device.
(B) is a view showing the back side, FIG. 4 is a flow chart of refrigerating capacity diagnosis, FIG. 5 is a configuration diagram using a microcomputer as another embodiment of the diagnostic device of the present invention, and FIG. 6 is cold / hot water pressure loss. It is a characteristic diagram. 100 ... Detection unit, 120 ... Stability determination unit, 130 ... Diagnostic block unit, 150 ... Judgment value calculation unit, 160 ... Actual measurement value calculation unit, 170 ... Comparison unit, 200 ... Display unit.

Claims (1)

[Claims] 1. A regenerator, a condenser, which constitutes an absorption chiller-heater,
An evaporator, a detector that detects the temperature of the components such as the absorber and the pipe system that connects each element, and a stability determiner that determines the stable state of the water chiller from the signal obtained by the detector,
As a result of the stability determination, if the cold / hot water machine is in a transient state, a blocking unit that blocks the diagnosis, an inlet temperature of the cooling water flowing into the absorber among the signals, an outlet temperature of the cold / hot water flowing out from the evaporator, and the A judgment value calculation unit that calculates the judgment value for each judgment element necessary for each diagnosis by correcting it from the temperature of the exhaust gas discharged from the regenerator, and an actual measurement that processes the signal and calculates the actual measurement value for each judgment element A value calculation unit, the determined judgment value obtained, a judgment element comparison unit that compares the measured value for each of a plurality of judgment elements determined by a diagnostic item, and a weight addition unit that weights the result of the comparison for each judgment element, A weight comparison unit that classifies and compares the weighted comparison results normally and abnormally, a display unit that displays the diagnosis results that are classified and compared normally or abnormally, and the setting of the model of the water heater Display screen operation Diagnostic apparatus for the absorption chiller, comprising an operation unit, a for the.