JPH1183126A - Controller for air conditioning facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for an air conditioning facility where the pressure of a forward header may not go up excessively when the load of air conditioning corresponding to a plurality of freezers has dropped suddenly. SOLUTION: In the case that the number of units ordered to stop all at once out of a plurality of air conditioners 6-10 arranged as load of air conditioning corresponding to plural freezers 1 and 2 is over the specified number of units of the air conditioners 6-10, where the pressure rise of the forward header 5 by all-round stoppage of the air conditioners 6-10 is not over the tolerable pressure, the operation of the specified number of units of air conditioners 6-10 is continued out of the number of units for all-round stop order of the air conditioners 6-10. As a result, the excessive pressure rise of a cold water circuit is suppressed, which prevents the abnormal stoppage by the pressure abnormality of the freezers 1 and 2, and prevents the life drop of pumps 3 and 4 by pressure abnormality, and prevents the occurrence of cold water leakage at the joint of pipes by pressure abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner which controls an air conditioner group in accordance with an air conditioner load condition.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show, for example, "Equipment and management".
FIG. 5 is a diagram showing a control device of a conventional air conditioner described in the January, 1994 issue, p. 35, FIG. 5 is an overall configuration diagram of a control device showing arrangement and connection of various devices, and FIG. 6 is a control diagram of FIG. It is a graph which shows the relationship between the air-conditioning load in a device and the number of operating refrigerators. In the figure, reference numerals 1 and 2 denote a plurality of refrigerators for generating cold and hot water, and reference numerals 3 and 4 denote a plurality of pumps connected to the refrigerators 1 and 2 for transporting the cold and hot water.

[0003] 5 is an outgoing header for mixing cold and hot water conveyed by the pumps 3 and 4, and 6 to 10 are air conditioners, each of which generates cold and hot air by the cold and hot water conveyed through the outgoing header 5. 11 to 15 are two-way valves,
It controls the flow rate of cold and hot water that is provided and supplied corresponding to each of the air conditioners 6 to 10. 16 is a return header for mixing cold and hot water from the two-way valves 11 to 15, 17 is an outgoing header 5
And a differential pressure measuring device for measuring a differential pressure between the return header 16 and the return header 16.

[0004] Reference numeral 18 denotes a header bypass valve provided in a conduit between the two, which is controlled by the operation of a regulator 19 which receives a differential pressure measured by a differential pressure measuring device 17 to set a predetermined differential pressure between the two. Keep at the value. Reference numeral 20 denotes a heat source control device that controls the number of operating refrigerators 1 and 2 according to the air conditioning loads of the air conditioners 6 to 10. Reference numeral 21 denotes a central monitoring device that outputs start / stop to the air conditioners 6 to 10 and a heat source control device. The operation of the pumps 3 and 4 and the refrigerators 1 and 2 is monitored via 20.

[0005] The conventional control device for air conditioning equipment is constructed as described above, and the twin of the combination of the refrigerator 1 and the pump 3 and the combination of the refrigerator 2 and the pump 4 are controlled by the heat source control device 20 to form the above. Both or one of the twins is started and stopped. Then, the cold and hot water generated in the refrigerators 1 and 2 is conveyed by the corresponding pumps 3 and 4 and mixed in the forward header 5.

Next, energy of the cold and hot water is consumed by the air conditioners 6 to 10 to generate a temperature difference between the forward temperature and the return temperature, mixed at the return header 16 and returned to the refrigerators 1 and 2 by the pumps 3 and 4. I do. In addition, the corresponding two-way valves 11 to 15 are controlled by the respective air conditioning loads of the air conditioners 6 to 10, and the temperature detector (not shown) controls each air conditioning load, that is, the temperature of the cold and hot water so that each room has a predetermined temperature. The flow rate is controlled as described below.

That is, for example, if the temperature of the room is high during heating, the correspondingly arranged two-way valve is tightened to reduce the flow rate of hot water, and if the temperature of the room is low, the correspondingly disposed two-way valve is opened. The flow rate of hot water increases. In general, the air conditioning load value is determined by the flow rate flowing through the air conditioners 6 to 10 by the heat source control device 20 via a flow meter or a water temperature meter (not shown), or the flow rate is determined by the outgoing water temperature and the return water temperature. It is determined by measuring and calculating the amount of heat consumed multiplied by the temperature difference between.

Then, the number of refrigerators 1 and 2 corresponding to the obtained air conditioning load value is started and stopped by the heat source control device 20. The relationship between the air conditioning load value and the number of operating chillers 1 and 2 will be described with reference to FIG. That is, when increasing the number of the refrigerators 1 and 2, one of the refrigerators 1 and 2 is operated when the air conditioning load is 50% or less, and the operation of the refrigerators 1 and 2 is performed when the air conditioning load exceeds 50%. Is increased to two units.

On the other hand, when the number of stages is reduced, for example, when two refrigerators 1 and 2 are operated, the air conditioning load is reduced by 45%.
%, The stages of the refrigerators 1 and 2 are reduced to one-unit operation. In order to prevent a hunting operation in which the operation of one of the refrigerators 1 and 2 and the operation of the two units are repeated in a short cycle in such an increase / decrease stage, the threshold value A at the time of the stage increase is set.
And a threshold value B at the time of step-down.

The flow rate and water temperature measured by the above-mentioned flow meter or water temperature gauge are determined based on whether an average value or a threshold value over a certain period of time has exceeded a certain period of time. Fluctuations exceeding the value for a moment are controlled so as not to change the increase / decrease stage of the refrigerators 1 and 2.

The operation relating to the pressure control of the control device of the air conditioner is performed as described below. That is, the opening degrees of the two-way valves 11 to 15 are controlled by the air conditioning loads of the air conditioners 6 to 10. For example, the two-way valve 11
When the closing operation is continued as it is when the closing operation starts, the pressure of the forward header 5 increases.

On the other hand, the differential pressure measuring device 17 measures the differential pressure between both the forward header 5 and the return header 16, and the differential pressure is received by the controller 19, and the differential pressure becomes a predetermined value. The header bypass valve 18 is controlled as described above. It should be noted that the header bypass valve 18 normally operates when the pumps 3, 4
The specified flow rate for one unit has a diameter that can be circulated.
That is, when two refrigerators 1 and 2 are operated, the two-way valves 11 to 15 are responsible for a flow rate equal to or greater than the specified flow rate for one pump 3 and 4, and the header bypass valve 18 is connected to one of the pumps 3 and 4. The flow rate will be less than the specified flow rate for each vehicle.

When the air conditioners 6 to 10 are operating at a flow rate of 100%, the two-way valves 11 to 15 are fully opened, and the two chillers 1, 2 and the pumps 3, 4 are operated. The header bypass valve 18 is fully closed. In this state, when three of the five air conditioners 6 to 10 are stopped from the central monitoring device 21, the two-way valves 11 to 13 of the two-way valves 11 to 15 are fully closed, and the air conditioning load is reduced. It becomes 40%.

That is, the flow rate of cold and hot water is 1
It drops sharply from 00% to 40%. At this time, although the heat source control device 20 detects a sudden decrease in the flow rate,
, The stop command cannot be issued to the refrigerators 1 and 2 for at least five minutes for determining the increase / decrease stage.

Even after the stop command is output to the chillers 1 and 2, if the chillers 1 and 2 are absorption chillers, the solidification of the absorbent is maintained even after the chillers 1 and 2 are stopped. Pumps 3 and 4 for 5 to 15 minutes by dilution operation to prevent
Need to drive. For this reason, the flow capacity of the header bypass valve 18 with respect to the flow rate of the cold / hot water flowing through the two-way valves 11 to 15, that is, the flow rate corresponding to a flow rate difference of 60% when the air conditioning load becomes 40% from the flow rate of 100%. Is 5
Since it is 0%, the pressure of the outgoing header 5 increases.

[0016]

In the above-described conventional air conditioner control device, when a large number of two-way valves 11 to 15 are rapidly closed, the opening of the header bypass valve 18 is reduced to 100%. Before the two-way valves 11 to 15 are fully closed, the pressure of the forward header 5 increases. Then, the refrigerators 1 and 2 are brought to an abnormal pressure due to the abnormal pressure rise of the going header 5, causing an emergency stop of the refrigerators 1 and 2, a shortening of the life of the pumps 3 and 4, and a problem of cold / hot water leakage at a joint of the pipeline. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a first object of the present invention is to control an air-conditioning system in which the pressure of an outgoing header does not increase when the air-conditioning load of a refrigerator is rapidly reduced. To get the equipment. A second object of the present invention is to provide a control device for an air conditioner which does not freeze during a dilution operation of a refrigerator which prevents solidification of an absorbent.

[0018]

In a control device for an air conditioner according to the present invention, a plurality of refrigerators for generating cold and hot water, and a plurality of pumps respectively connected to the refrigerator and transporting the cold and hot water are provided. , A forward header that mixes cold and hot water conveyed by these pumps, a plurality of air conditioners that respectively generate cold and hot air by the cold and hot water conveyed via the forward header, and a plurality of air conditioners corresponding to these air conditioners, respectively. A two-way valve that controls the flow rate of the supplied and supplied cold and hot water, a return header that mixes the cold and hot water from these two-way valves, and a differential pressure measurement that measures the differential pressure between the forward header and the return header , A header bypass valve provided in the pipeline between the outgoing header and the return header and controlled by the operation of the differential pressure measuring device to maintain the differential pressure at a predetermined value, and the number of refrigerators operated by the air conditioning load of the air conditioner. To A central monitoring device that outputs a start / stop to a heat source control device, an air conditioner, and monitors the operation of a pump and a refrigerator through the heat source control device, and a start / stop output for the air conditioner by the central monitoring device. Air conditioner control means for limiting the number of stopped air conditioners when the number of operated air conditioners suddenly decreases to suppress over-pressurization of the cooling / heating water circuit.

In the control device for an air conditioner according to the present invention, the air conditioner control means may determine that a plurality of air conditioners are simultaneously stopped, and that the pressure increase of the forward header due to the simultaneous stop of the air conditioners exceeds the allowable pressure. A function is provided for immediately opening the header bypass valve when the number exceeds the predetermined number.

In the control apparatus for an air conditioner according to the present invention, the control means for the air conditioner may be configured such that the number of air conditioners simultaneously stopped is such that the pressure rise of the forward header due to the simultaneous stop of the air conditioners exceeds the allowable pressure. When the number of air conditioners exceeds the predetermined number, the function of immediately opening the header bypass valve and the function of continuing the operation of the predetermined number of air conditioners out of the plurality of air conditioners simultaneously stopped are provided.

In the control device for an air conditioner according to the present invention, after the operation of all the plurality of pumps is stopped at the end of the operation of the air conditioner, a command is issued to stop the air conditioner that was last stopped. Termination stop command means is provided.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 and 2 are views showing an example of an embodiment of the present invention. FIG. 1 is an overall configuration diagram of a control device showing arrangement and connection of various devices, and FIG. 2 explains the operation of the control device of FIG. FIG. In the figure, reference numerals 1 and 2 denote a plurality of refrigerators for generating cold and hot water, and reference numerals 3 and 4 denote a plurality of pumps connected to the refrigerators 1 and 2 for transporting the cold and hot water.

5 is an outgoing header for mixing the cold and hot water conveyed by the pumps 3 and 4, and 6 to 10 are air conditioners, each of which generates cold and hot air by the cold and hot water conveyed through the outgoing header 5. 11 to 15 are two-way valves,
It controls the flow rate of cold and hot water that is provided and supplied corresponding to each of the air conditioners 6 to 10. 16 is a return header for mixing cold and hot water from the two-way valves 11 to 15, 17 is an outgoing header 5
And a differential pressure measuring device for measuring a differential pressure between the return header 16 and the return header 16.

Reference numeral 18 denotes a header bypass valve provided in a conduit between the two, which is controlled by the operation of a controller 19 which receives a differential pressure measured by a differential pressure measuring device 17 to set a predetermined differential pressure between the two. Keep at the value. Reference numeral 20 denotes a heat source control device that controls the number of operating refrigerators 1 and 2 according to the air conditioning loads of the air conditioners 6 to 10. Reference numeral 21 denotes a central monitoring device that outputs start / stop to the air conditioners 6 to 10 and a heat source control device. The operation of the pumps 3 and 4 and the refrigerators 1 and 2 is monitored via 20.

Numeral 22 denotes an air conditioner control means, which receives a start / stop command from the central monitoring device 21 to the air conditioners 6 to 10 and responds to the stop command to the air conditioners 6 to 10 by a header bypass valve 18. Outputs a fully open command. If the number of operating air conditioners 6 to 10 suddenly decreases beyond a predetermined value due to a stop command to the air conditioners 6 to 10 by the central monitoring device 21, the number of air conditioners 6 to 10 exceeding the predetermined value is reduced. Temporarily disable the stop operation.

In the control device for the air conditioning equipment configured as described above, the twins formed by combining the refrigerator 1 and the pump 3 and the refrigerator 2 and the pump 4 are controlled by the heat source control device 20 to form the twin. Both or one of them is started / stopped. Then, the cold and hot water generated in the refrigerators 1 and 2 is conveyed by the corresponding pumps 3 and 4 and mixed in the forward header 5.

Next, the cold and hot water is consumed in the air conditioners 6 to 10 to generate a temperature difference between the forward temperature and the return temperature, and is mixed in the return header 16 and returned to the refrigerators 1 and 2 by the pumps 3 and 4. I do. In addition, the corresponding two-way valves 11 to 15 are controlled by the respective air conditioning loads of the air conditioners 6 to 10, and the temperature detector (not shown) controls each air conditioning load, that is, the temperature of the cold and hot water so that each room has a predetermined temperature. The control of the air-conditioning equipment such as the control of the flow rate is performed in the same manner as the control device of the air-conditioning equipment in FIGS.

The control relating to the start / stop of the air conditioners 6 to 10 is performed according to the flowchart shown in FIG. That is, although not shown, the central monitoring device 21
The number N of the air conditioners 6 to 10 to be simultaneously stopped is input by a push button or a symbol on the screen provided on the man-machine portion of the air conditioner. Then, in step 101, if the number N of simultaneous stops is larger than the predetermined number K in which the pressure increase of the forward header 5 due to the simultaneous stoppage of the air conditioners 6 to 10 does not exceed the allowable pressure, the process proceeds to step 102; Proceed to.

Thus, in step 103, the N air conditioners 6 to 10 are controlled to stop according to the simultaneous stop command. In step 102, a forced full opening of the header bypass valve 18 is commanded. Next, step 104
To the number of air conditioners 6 to
Only 10 is controlled to stop. Then, the process proceeds to step 105, at which a wait is performed until the header bypass valve 18 is fully opened.

After the elapse of the waiting time in step 105, the process proceeds to step 106, in which the remaining air conditioners 6 to 10 instructed to be simultaneously stopped, that is, the number of air conditioners 6 to 10 obtained by subtracting the predetermined number K from the number of simultaneously stopped N. Is controlled to stop.
Next, the routine proceeds to step 107, where the header bypass valve 18
Is returned to the normal state.

As described above, when the number N of the air conditioners 6 to 10 that are simultaneously stopped is greater than the predetermined number K that does not exceed the allowable pressure, the pressure increase of the forward header 5 due to the simultaneous stop of the air conditioners 6 to 10 is performed. Immediately, the header bypass valve 18 is forcibly and fully opened. For this reason, since the header bypass valve 18 is fully opened at an early stage, abnormal pressure increase of the forward header 5 can be suppressed.

Therefore, due to abnormal pressure increase of the forward header 5, that is, excessive pressure increase in the circuit of the cold and hot water, the refrigerators 1, 2
Can be prevented from occurring due to an emergency pressure, a reduction in the life of the pumps 3 and 4, and a leakage of cold and hot water at the seam of the pipeline. In addition, a predetermined number of air conditioners 6 to 10 of the plurality of air conditioners 6 to 10 at the same time are continuously operated. As a result, excessive pressure increase in the cold / hot water circuit is suppressed, so that an emergency stop due to abnormal pressure of the refrigerators 1 and 2 can be prevented, and a reduction in the life of the pumps 3 and 4 can be prevented.

The device configuration corresponding to the operation of the flowchart of FIG. 2 can be formed by a dedicated H / W, and can also be executed by a program using a CPU and a memory. Further, instead of instructing the header bypass valve 18 to fully open, a configuration in which the header bypass valve 18 is instructed to fully open via the adjuster 19 is also possible.

In the embodiment shown in FIGS. 1 and 2, the refrigerators 1 and 2, ie, two air conditioners and five air conditioners 6 to 10 are installed. Even in an air conditioner in which a plurality of machines 6 to 10 are appropriately installed, the same operation as the embodiment of FIGS. 1 and 2 can be obtained.

Embodiment 2 By applying the above-described embodiment of FIGS. 1 and 2, a control device for an air conditioner can be easily configured as described below. That is, the air conditioner control means 22 is controlled by the simultaneous stop number N of the air conditioners 6 to 10.
When the pressure increase of the forward header 5 due to the simultaneous stoppage of the air conditioners 6 to 10 is larger than the predetermined number K which does not exceed the allowable pressure, the header bypass valve 18 is forcibly and fully opened immediately.

Thus, if the number N of the air conditioners 6 to 10 that are simultaneously stopped is greater than the predetermined number K, the header bypass valve 18 is fully opened early, so that abnormal pressure increase of the forward header 5 is suppressed. be able to. Therefore, although detailed description is omitted, the same operation as in the embodiment of FIGS. 1 and 2 can be obtained in the second embodiment.

Embodiment 3 By applying the above-described embodiment of FIGS. 1 and 2, a control device for an air conditioner can be easily configured as described below. That is, the air conditioner control means 22 is controlled by the simultaneous stop number N of the air conditioners 6 to 10.
When the pressure increase of the outgoing header 5 due to the simultaneous stoppage of the air conditioners 6 to 10 is larger than the predetermined number K which does not exceed the allowable pressure, the header bypass valve 18 is forcibly and fully opened immediately, and a plurality of units are simultaneously controlled. Air conditioners 6-1 of the number of stopped units N
A configuration is made so that the operation of a predetermined number out of 0 is continued.

Thus, when the number N of air conditioners 6 to 10 to be simultaneously stopped is larger than the predetermined number K, the header bypass valve 18 is fully opened early and the air conditioning of the plurality of simultaneously stopped number N is performed. Some operations of the machines 6 to 10 are continued. For this reason, abnormal pressure rise of the outgoing header 5 can be suppressed. Therefore, although detailed description is omitted, the same operation as in the embodiment of FIGS. 1 and 2 can be obtained in the third embodiment.

Embodiment 4 3 and 4 are views showing an example of another embodiment of the present invention. FIG. 3 is an overall configuration diagram of a control device showing arrangement and connection of various devices, and FIG.
4 is a flowchart illustrating the operation of the control device of FIG. In the figure, the same reference numerals as those in FIGS.
Reference numeral 3 denotes an end stop command means for instructing the stoppage of the air conditioners 6 to 10 which were last stopped after the operation of all the pumps 3 and 4 is stopped at the end of the operation of the air conditioner.

In the control device for the air-conditioning equipment configured as described above, the control of the air-conditioning equipment such as the control of the flow rate of the cold and hot water is performed in the same manner as the control device for the air-conditioning equipment in FIGS. Will be And the air conditioners 6 to 10
The control relating to the start / stop of the operation is performed according to the flowchart shown in FIG. That is, although not shown, the number N of the air conditioners 6 to 10 to be simultaneously stopped is input by a push button provided on the man-machine portion of the central monitoring device 21 or a symbol on the screen.

In step 201, if the number N of simultaneous stops is larger than the predetermined number K in which the pressure increase of the forward header 5 due to the simultaneous stoppage of the air conditioners 6 to 10 does not exceed the allowable pressure, the process proceeds to step 202, and if the number N is small. If so, proceed to step 203. Thus, the N air conditioners 6 to 10 are controlled to stop in step 203 according to the simultaneous stop command. In step 202, a command is issued to forcefully open the header bypass valve 18.

Next, the routine proceeds to step 204, where only the air conditioners 6 to 10 corresponding to the predetermined number K are controlled to be stopped. Then, the routine proceeds to step 205, where a wait is performed until the header bypass valve 18 is fully opened. Then, after the elapse of the waiting time in Step 205, Step 2
06 and the remaining air conditioners 6-1 that were commanded to shut down all at once
0, that is, the number of air conditioners 6 to 10 obtained by subtracting the predetermined number K from the simultaneously stopped number N is controlled to be stopped. Next, the routine proceeds to step 207, where the pressure control of the header bypass valve 18 is returned to the normal state.

Next, proceeding to step 208, if all the pumps 3 and 4 have stopped, proceed to step 210, otherwise proceed to step 209. Then, in step 209, the stop command of the air conditioners 6 to 10 last stopped is canceled, and the process returns to step 208. Further, the air conditioners 6 to 1 that were last stopped in step 210
Stop 0.

As described above, when the number N of the air conditioners 6 to 10 which are simultaneously stopped is larger than the predetermined number K at which the pressure increase of the forward header 5 due to the simultaneous stop of the air conditioners 6 to 10 does not exceed the allowable pressure. Immediately, the header bypass valve 18 is forcibly and fully opened. For this reason, since the header bypass valve 18 is fully opened at an early stage, abnormal pressure increase of the forward header 5 can be suppressed.

Therefore, due to the abnormal pressure increase of the outgoing header 5, that is, the excessive pressure increase of the cold / hot water circuit, the refrigerators 1, 2
Can be prevented from occurring due to an emergency pressure, a reduction in the life of the pumps 3 and 4, and a leakage of cold and hot water at the seam of the pipeline. In addition, since the operation of a predetermined number of the plurality of air conditioners 6 to 10 is continued,
Emergency stop and pumps 3 and 4 due to abnormal pressure in refrigerators 1 and 2
Can be prevented from being shortened.

If the refrigerators 1 and 2 are in a dilution operation for preventing the solidification of the absorbent, that is, if at least one of the pumps 3 and 4 is operated, the air conditioner last stopped is operated. The operation of the machines 6 to 10 is continued. Thereby, the air conditioning load of one of the air conditioners 6 to 10 is maintained, so that a problem caused by freezing occurring during the dilution operation of the refrigerators 1 and 2 can be prevented beforehand.

[0047]

As described above, the present invention provides a plurality of refrigerators for generating cold and hot water, a plurality of pumps respectively connected to the refrigerators for transporting the cold and hot water, and a plurality of pumps transported by these pumps. Header that mixes cold and hot water, a plurality of air conditioners that generate cold and hot air respectively by the cold and hot water conveyed through the header, A two-way valve that controls the flow rate of water, a return header that mixes cold and hot water from these two-way valves, a differential pressure gauge that measures the differential pressure between the outgoing header and the return header, A header bypass valve provided in a conduit between the headers and controlled by the operation of the differential pressure measuring device to maintain the differential pressure at a predetermined value;
A heat source control device that controls the number of refrigerators operated according to the air conditioning load of the air conditioner, and outputs start / stop to the air conditioner,
A central monitoring device that monitors the operation of pumps and refrigerators via a heat source control device, and limits the number of air conditioners that stop when the number of air conditioners suddenly decreases due to the start / stop output of the air conditioners by the central monitoring device. And air-conditioning equipment control means for suppressing over-pressurization of the cold / hot water circuit.

With this, if the number of air-conditioner simultaneous stop commands is larger than a predetermined number of which the pressure increase of the forward header due to the simultaneous stop of the air-conditioner does not exceed the allowable pressure, the function of the air-conditioning equipment control means is used. The operation of a predetermined number of air conditioners out of the simultaneous stop command number is continued. As a result, excessive pressure increase in the cold / hot water circuit is suppressed, so that there is an effect of preventing an emergency stop due to a pressure abnormality of the refrigerator, a shortening of the service life of the pump, and a leak of cold / hot water at a seam of the pipeline.

As described above, according to the present invention, the air-conditioning equipment control means is controlled by a plurality of air-conditioners simultaneously stopped.
The header bypass valve is fully opened immediately when the pressure increase of the outgoing header due to the simultaneous stoppage of the air conditioner is larger than a predetermined number that does not exceed the allowable pressure.

Thus, if the number of air-conditioner simultaneous stop commands is greater than a predetermined number of which the pressure increase of the forward header due to the simultaneous stop of the air conditioner does not exceed the allowable pressure, the function of the air-conditioning equipment control means immediately The header bypass valve is fully opened. As a result, excessive pressure increase in the cold / hot water circuit is suppressed, so that there is an effect of preventing an emergency stop due to a pressure abnormality of the refrigerator, a shortening of the service life of the pump, and a leak of cold / hot water at a seam of the pipeline.

As described above, according to the present invention, a plurality of air conditioners are simultaneously stopped by the air conditioner control means.
When the pressure rise of the outgoing header due to the simultaneous stoppage of the air conditioner is larger than the predetermined number that does not exceed the allowable pressure, the header bypass valve is fully opened immediately. It is configured to continue operation of a part number.

With this, if the number of air-conditioner simultaneous stop commands is greater than the predetermined number of which the pressure increase of the forward header due to the simultaneous stop of the air conditioner does not exceed the allowable pressure, the function of the air-conditioning equipment control means immediately The header bypass valve is fully opened, and a part of the air conditioners whose number is simultaneously stopped is operated. As a result, excessive pressure increase in the cold / hot water circuit is suppressed, so that there is an effect of preventing an emergency stop due to a pressure abnormality of the refrigerator, a shortening of the service life of the pump, and a leak of cold / hot water at a seam of the pipeline.

As described above, according to the present invention, after the operation of all the plurality of pumps is stopped at the end of the operation of the air conditioner, the end stop command for instructing the stop of the air conditioner that was last stopped is provided. Means are provided.

Accordingly, when the refrigerator is in the dilution operation for preventing the solidification of the absorbent, that is, when at least one pump is operating, the operation of the air conditioner that was last stopped is operated. Is continued. Thus, the air conditioning load of the air conditioner is maintained at the end of the operation of the air conditioner, so that there is an effect of preventing a problem caused by freezing occurring during the dilution operation of the refrigerator.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, and is an overall configuration diagram of a control device showing arrangement and connection of various devices.

FIG. 2 is a flowchart illustrating the operation of the control device in FIG. 1;

FIG. 3 is a diagram showing the second embodiment of the present invention, and is an overall configuration diagram of a control device showing arrangement and connection of various devices.

FIG. 4 is a flowchart illustrating the operation of the control device in FIG. 3;

FIG. 5 is a diagram showing a conventional control device for air conditioning equipment, and is an overall configuration diagram showing the arrangement and connection of various devices.

FIG. 6 is a graph showing the relationship between the air conditioning load and the number of operating refrigerators in the control device of FIG. 5;

[Explanation of symbols]

1, 2 refrigerators, 3, 4 pumps, 5 headers, 6
-10 air conditioner, 11-15 two-way valve, 16 return header, 17 differential pressure measuring instrument, 18 header bypass valve, 2
0 Heat source control device, 21 Central monitoring device, 22 Air conditioning equipment control means, 23 Termination stop command means.

Claims (4)

[Claims] 1. A plurality of refrigerators for generating cold and hot water, a plurality of pumps respectively connected to the refrigerator for transporting the cold and hot water, and the cold and hot water transported by these pumps are mixed. An outgoing header, a plurality of air conditioners that respectively generate cold and hot air by the cold and hot water conveyed through the outgoing header, and a flow rate of the cold and hot water that is provided and supplied corresponding to each of the air conditioners is controlled. A two-way valve, a return header that mixes cold and hot water from these two-way valves, a differential pressure measuring device that measures the differential pressure between the forward header and the return header, A header bypass valve that is provided in the pipeline and is controlled by the operation of the differential pressure measuring device to maintain the differential pressure at a predetermined value; and a heat source control device that controls the number of operating the refrigerators by the air conditioning load of the air conditioner. , A central monitoring device that outputs a start / stop to the air conditioner and monitors the operation of the pump and the refrigerator via the heat source control device, and a start / stop output for the air conditioner by the central monitoring device. An air-conditioning equipment control device comprising: air-conditioning equipment control means for limiting the number of stopped air-conditioners when the number of air-conditioning units suddenly decreases to suppress over-pressurization of the cooling / heating water circuit. 2. The air-conditioning equipment control means, if the number of simultaneously stopped air conditioners of a plurality of air conditioners is greater than a predetermined number of which does not exceed an allowable pressure by a rise in pressure of an outgoing header due to the simultaneous stop of the air conditioners, 2. The control device for an air conditioning system according to claim 1, wherein the control device has a function of fully opening the bypass valve. 3. The air-conditioning equipment control means, when the number of simultaneously stopped air conditioners of a plurality of air conditioners is larger than a predetermined number of which does not exceed a permissible pressure increase in the forward header due to the simultaneous stop of the air conditioners. The control device for an air conditioner according to claim 1, wherein the control device has a function of fully opening a bypass valve and a function of continuing operation of a predetermined number of the plurality of air conditioners. 4. An end stop command means for instructing a stop of the air conditioner which was last stopped after all the plurality of pumps have stopped operating at the end of the operation of the air conditioner. The control device for an air conditioner according to claim 1.