JP6942575B2 - Heat source water control method and heat source water control device - Google Patents

Description

Embodiments of the present invention relate to a heat source water control method and a heat source water control device.

Conventionally, heat source water (cold water or hot water) generated by a heat source machine is used for air conditioning equipment such as multiple air handling units (hereinafter referred to as "air han") and equipment on the user side such as industrial machines that require temperature control. There is a heat source system that feeds water with a water pump. The heat source water sent to the user-side equipment is heat-exchanged by the user-side heat load such as a heat exchanger, and then returned to the heat source machine.

The heat source machine controls a compressor that cools or heats the heat source water so that the water supply temperature (also referred to as outflow temperature) of the heat source water to be sent to the user-side equipment is within a preset range. In addition, the heat source machine changes the operating state of the compressor according to the heat load state of the equipment on the user side. For example, when the heat load state of the equipment on the user side is low, the heat source machine reduces the number of compressors in operation, lowers the number of revolutions of the compressor, or stops the operation. The heat source machine sends heat source water to the user side equipment in order to detect the heat load state of the user side equipment, and detects the temperature (return water temperature) when the heat source water is returned from the user side equipment to the heat source unit. The heat source machine can detect the forward water temperature and the return water temperature by operating the water supply pump.

The user-side device has a valve that adjusts the amount of heat source water supplied to the user-side device, and controls the valve opening degree of the valve according to the heat load state. The user-side equipment closes the valve to stop the supply of heat source water when there is no heat load condition or when it is extremely small. If the valve is closed and the supply of heat source water to the equipment on the user side is stopped, the heat source water sent from the water supply pump will be passed through the bypass pipe and pressure relief valve, which is wasted due to the operation of the water supply pump. Power was sometimes generated. Further, by operating the water supply pump, the pump generates heat and raises the temperature of the heat source water, so that the power of the compressor may be increased during cooling.

International Publication No. 2010/09916

An object to be solved by the present invention is to provide a heat source water control method and a heat source water control device capable of reducing the power of the heat source machine.

In the heat source water control method of the embodiment, the heat source water control device executes a stop information acquisition step, an operation state acquisition step, a valve opening degree acquisition step, and an operation switching step. The stop information acquisition step acquires information on whether or not the compressor of the heat source machine whose operation is controlled based on the water temperature of the heat source water sent from the heat source machine to the heat load on the user side has been stopped. The operating state acquisition step acquires the operating state of the heat source machine side pump whose rotation speed is controlled based on the amount of heat source water sent to the user side heat load. The valve opening degree acquisition step acquires the valve opening degree of the valve that adjusts the supply amount of the heat source water to be supplied to the heat load on the user side. The operation switching step is based on the information on whether or not the compressor acquired in the stop information acquisition step is stopped, the operation state acquired in the operation state acquisition step, and the valve opening degree acquired in the valve opening degree acquisition step. , Switch between the operating state and the stopped state of the heat source machine side pump.

The figure which shows an example of the heat source water control system of embodiment. The figure which shows an example of the software structure of the heat source water control device of embodiment. The figure which shows an example of the hardware composition of the heat source water control apparatus of embodiment. The flowchart which shows an example of the operation of the heat source water control device of embodiment.

Hereinafter, the heat source water control method and the heat source water control device of the embodiment will be described with reference to the drawings. In each of the figures shown below, the same reference numerals are given to the same configurations.

First, an example of the heat source water control system of the embodiment will be described with reference to FIG.

In FIG. 1, the heat source water control system 1 includes a central monitoring device 10, a heat source machine 12, a free bypass circuit 13, a forward water temperature sensor 15, a water meter 16, a return water temperature sensor 17, an air han 20 which is a user-side device, and a valve. It has 21, a thermometer 22, an indicator controller 23, a secondary side water supply pump (load side water supply pump) 31, and a pressure relief circuit 32. The heat source water control system 1 sends the heat source water generated by the heat source machine 12 to one or more air hans 20. Although FIG. 1 shows two air hans 20, an air han 20a and an air han 20b, the number of air hans 20 may be one or three or more. The valve 21, the thermometer 22, and the indicator controller 23 are installed for each of the air hans 20. A valve 21a, a thermometer 22a, and an indicator controller 23a are installed in the air han 20a, and a valve 21b, a thermometer 22b, and an indicator controller 23b are installed in the air han 20b.

Further, the heat source water control system 1 has a heat source water control function for controlling the operating state of the primary side water supply pump 123 exemplified as the heat source machine side pump. In the heat source water control system 1, a device having a heat source water control function (hereinafter referred to as “heat source water control device”) is not limited to a specific device. Therefore, although a specific heat source water control device is not specified in FIG. 1, for example, a module controller (Module Controller: MC) 121, a group controller (Group Controller: GC) 122, a central monitoring device 10, and the like are heat source water control devices. Can be. Details of the heat source water control device will be described later with reference to FIGS. 2 to 4.

The heat source machine 12 includes, for example, a plurality of heat source modules 120 which are module type chilling units including a plurality of refrigeration cycle devices and a primary side water pump (heat source machine side pump) 123, and controls the plurality of heat source modules 120. The module controller (MC) 121 is provided. The module controller 121 is communicably connected to a group controller (GC) 122 that further controls a plurality of heat source machines 12.

The module controller 121 controls the number of operating units of each heat source module 120 of the heat source machine 12, and controls the water pressure or the amount of the heat source water sent from the heat source machine 12. For example, the module controller 121 sends a control signal to each heat source module 120 so as to make the water supply pressure or the amount of water supply constant, and the primary side water supply pump 123 of each heat source module 120 is controlled based on the control signal. The water supply pressure and the water supply amount can be controlled by, for example, the number of operating units and the number of revolutions of the primary side water supply pump 123. The rotation speed of the primary side water supply pump 123 can be controlled, for example, by the frequency output from an inverter device (not shown) included in the heat source module 120. The module controller 121 transmits the operating status such as the number of operating units and the number of revolutions of the primary side water supply pump 123 to the group controller 122. The water supply pressure is measured by, for example, a differential pressure gauge (not shown) that measures the differential pressure between the outgoing water sent from the heat source machine and the returned water returned to the heat source machine. Further, the water supply amount is calculated based on, for example, the pressure loss of the heat source water supplied from the primary side water supply pump 123. Here, the amount of heat source water may be measured by a water meter separately provided in the pipe.

The group controller 122 gives a set temperature instruction to the module controller 121 of the heat source machine 12, and the water temperature of the heat source water sent from the heat source machine 12 is controlled according to the set temperature. The heat source module 120 has four air heat exchangers, two water heat exchangers (not shown), and one primary side water pump 123. The heat source module 120 uses two water heat exchangers to compress and expand the refrigerant by four independent refrigeration cycle devices equipped with a compressor (not shown) connected to each air heat exchanger by a refrigerant pipe. Heat source water is generated by heat exchange. The generated heat source water is sent by the primary side water supply pump 123. The water temperature of the heat source water may be measured by, for example, the outgoing water temperature sensor 15. The heat source module 120 controls an operating state such as the number of compressors in operation, the number of revolutions of the compressor, or the compression rate so that the temperature of the heat source water becomes a predetermined temperature. The rotation speed of the compressor can be controlled by a frequency output from an inverter device (not shown) included in the heat source module 120. For example, in cooling, the heat source water is cooled by driving a compressor. When the number of revolutions of the compressor is increased, the temperature of the heat source water decreases. The heat source module 120 may stop the operation of the compressor when the temperature of the heat source water becomes equal to or lower than a predetermined temperature. The group controller 122 outputs the operating state including the stop of the compressor to the central monitoring device 10. The rotation speed of the compressor is output, for example, with a current output of 4 to 20 mA and a voltage output of 0 to 5 V. Further, the operation or stop of the compressor may be output by a relay output with or without contact.

The outgoing water temperature sensor 15 measures the water temperature of the heat source water sent to the air han 20a and the air han 20b. The measured water supply temperature is input to the group controller 122. The return water temperature sensor 17 measures the return water temperature of the heat source water returned from the air han 20a and the air han 20b to the heat source machine 12.

The difference between the water supply temperature and the return water temperature changes depending on the amount of heat exchange (heat load) in the air han 20. The measured return water temperature is input to the group controller 122 via the module controller 121. The group controller 122 detects that the heat load of the air han 20 has changed based on the change in the input water supply temperature and the return water temperature, and transmits the compressor to each heat source module 120 via the module controller 121. A control signal that changes the operating state may be transmitted. For example, when the water supply temperature is at a predetermined temperature and there is no difference between the water supply temperature and the return water temperature, the group controller 122 or the module controller 121 instructs the heat source module 120 to stop the operation and operates the compressor. You may stop. This makes it possible to reduce the power of the compressor. The module controller 121 notifies the central monitoring device 10 that the operation of the compressor has been stopped via the group controller 122. Further, the group controller 122 compresses when the difference between the water supply temperature and the return water temperature becomes large even when the water supply temperature is at a predetermined temperature when the compressor operation is stopped. The operation of the aircraft may be resumed. As a result, by restarting the operation of the compressor early in response to an increase in the heat load, it is possible to improve the water responsiveness of the water temperature control and stabilize the water supply temperature.

The water meter 16 measures the amount of heat source water sent to the air han 20a and the air han 20b. The amount of water sent is the total amount of heat source water sent to the plurality of air hans 20. The measured water supply amount is input to the central monitoring device 10 via the module controller 121 and the group controller 122.

The secondary side water supply pump 31 supplies heat source water to the air han 20a and the air han 20b. The secondary side water supply pump 31 can control the number of operating units and the number of rotations.

The valve 21 adjusts the flow rate of the heat source water supplied to the air han 20 according to the valve opening degree. The valve 21 changes the flow rate according to the change in the valve opening degree. The characteristic of the change in flow rate with respect to the change in valve opening is called the flow rate characteristic of the valve. As a valve for adjusting the flow rate, a valve having a linear characteristic or an equal percent characteristic is often used. The linear characteristic is a flow rate characteristic in which the flow rate changes in proportion to the valve opening degree. The equal percent characteristic is a characteristic in which the amount of change in the flow rate is the same as the flow rate before the change regardless of the position where the valve opening changes. That is, in the equal percent characteristic, the rate of change of the flow rate is proportional to the flow rate.

The thermometer 22 measures the state of the heat load of the air han, which is a user-side device, by measuring the temperature of the air han 20. The thermometer 22 can be composed of one or more sensors. The temperature measured by the thermometer 22 is input to the indicator controller 23.

The indicator controller 23 adjusts the valve opening degree of the valve 21 and the operating state of the secondary side water supply pump 31 based on the indicated temperature and the temperature of the air han 20 measured by the thermometer 22. For example, in the case of cooling, when the temperature measured by the thermometer 22 is higher than that of the indicator controller 23 and the difference between the temperature measured by the thermometer 22 and the indicated temperature is large, the indicator controller 23 uses the valve 21. The valve opening degree of the secondary side water supply pump 31 is increased, and the number of operating units and the number of rotations of the secondary side water supply pump 31 are increased. On the other hand, when the difference between the temperature measured by the thermometer 22 and the indicated temperature is small, the indicator controller 23 reduces the valve opening degree of the valve 21 and operates and rotates the secondary side water pump 31. Reduce the number. Further, when the temperature measured by the thermometer 22 reaches the indicated temperature, the indicator controller 23 closes the valve of the valve 21 (sets the valve opening to 0) and causes the secondary side water supply pump 31 to operate. Operate with minimal power. When the valve 21 (valve 21a and valve 21b) is closed, the flow rate of the heat source water supplied to the air han 20 becomes 0, so that the heat source water sent by the secondary side water supply pump 31 is bypassed by the pressure relief circuit 32. It is returned to the secondary side water supply pump 31. The indicator controller 23 outputs valve opening information to the central monitoring device 10. The valve opening information is output, for example, with a current output of 4 to 20 mA and a voltage output of 0 to 5 V.
Further, the central monitoring device 10 outputs valve opening information of the valves 21a and the valve 21b that control the amount of water supplied to the air han 20a and the air han 20b to the group controller 122, and the group controller 122 outputs the valve opening information to the module controller 121. Can be output.

As described above, the secondary side water supply pump 31 is operated according to the state of the heat load of the air han 20a and the air han 20b, which are the equipment on the user side. At this time, the secondary side water supply pump 31 is operated independently of the primary side water supply pump 123. For example, when heat source water is supplied from one heat source machine 12 to a plurality of user-side loads, the load state of the user-side load and the required heat source water supply amount may be different from each other. Further, the water pressure of the heat source water at each user side load varies depending on the amount of heat source water supplied to the other user side loads. By operating the secondary side water supply pump 31 independently of the primary side water supply pump 123. It is possible to supply stable heat source water by reducing the influence of fluctuations in water pressure due to other load conditions on the user side.

The free bypass circuit 13 is a bypass pipe that connects the outlet side and the inlet side of the primary side water supply pump 123 of the heat source machine 12. As described above, since the primary side water supply pump 123 and the secondary side water supply pump 31 are operated independently, there is a difference between the water supply amount of the primary side water supply pump 123 and the water supply amount of the secondary side water supply pump 31. The free bypass circuit 13 adjusts the difference between the water supply amount of the primary side water supply pump 123 and the water supply amount of the secondary side water supply pump 31. For example, when the amount of water supplied by the primary side water supply pump 123 is larger than the amount of water supplied by the secondary side water supply pump 31, heat source water flows through the free bypass circuit 13 from left to right in FIG. On the other hand, when the amount of water supplied by the primary side water supply pump 123 is smaller than the amount of water supplied by the secondary side water supply pump 31, heat source water flows through the free bypass circuit 13 from right to left in FIG. By providing the free bypass circuit 13, even if there is a difference between the water supply amount of the primary side water supply pump 123 and the water supply amount of the secondary side water supply pump 31, the water supply amount in each pump can be secured.

Next, the configuration of the software of the heat source water control device of the embodiment will be described with reference to FIG.

In FIG. 2, the heat source water control device has the functions of a stop information acquisition unit 51, an operation state acquisition unit 52, a valve opening degree acquisition unit 53, a water temperature acquisition unit 54, and an operation switching unit 55.

The stop information acquisition unit 51, the operating state acquisition unit 52, the valve opening degree acquisition unit 53, and the water temperature acquisition unit 54 of the heat source water control device have a function of acquiring predetermined information from the outside of the heat source water control device. The operation switching unit 55 is a function of executing control to the outside of the heat source water control device based on the acquired information. In the present embodiment, each of these functions will be described as being realized by executing software (program). That is, FIG. 2 shows one aspect of a heat source water control program that causes the heat source water control device to execute the heat source water control process.
For example, in the heat source water control system 1 shown in FIG. 1, this heat source water control program is incorporated in any one of the module controller 121, the group controller 122, and the central monitoring device 10.

In the present embodiment, a case where a heat source water control program is incorporated in the module controller 121 and functions as a heat source water control device will be described. That is, in this case, the module controller 121 includes a stop information acquisition unit 51, an operation state acquisition unit 52, a valve opening degree acquisition unit 53, a water temperature acquisition unit 54, and an operation switching unit 55.
The stop information acquisition unit 51 acquires information on whether or not the compressor of the heat source machine 12 has been stopped. The operation of the compressor is controlled based on the temperature of the heat source water sent from the heat source machine 12 to the air han 20 exemplified as the heat load on the user side. Information on whether or not the compressor has been stopped can be obtained from the group controller 122. The heat source module 120 stops the operation of the compressor when there is no difference between the water supply temperature and the return water temperature when the water supply temperature is at a predetermined temperature. The stop information acquisition unit 51 can confirm that the heat load of the air han 20 has been reduced by acquiring information on whether or not the compressor has been stopped.

The operation state acquisition unit 52 acquires the operation state of the primary side water supply pump 123. The primary side water supply pump 123 is an example of a heat source machine side pump whose rotation speed is controlled based on the amount of heat source water sent to the air han 20 exemplified as a user side heat load. The operating state of the primary side water supply pump 123 is, for example, the rotation speed of the primary side water supply pump 123. The rotation speed of the primary side water supply pump 123 can be obtained by acquiring the output frequency from the inverter that drives the primary side water supply pump 123 and the measured value measured by the tachometer installed on the rotation shaft of the pump. .. In the present embodiment, the information related to the output frequency may include information related to the rotation speed of the primary side water supply pump 123 rotating at that frequency. Information on the output frequency can be obtained, for example, with a current output of 4 to 20 mA and a voltage output of 0 to 5 V. The operation state acquisition unit 52 can confirm the load status of the primary side water supply pump 123 by acquiring the operation state of the primary side water supply pump 123.

The valve opening degree acquisition unit 53 acquires the valve opening degree of the valve 21. The valve 21 is an example of a valve that adjusts the supply amount of heat source water supplied to the air han 20 exemplified as a user-side heat load. The valve opening degree of the valve 21 can be obtained, for example, by the output from the indicator controller 23 to the valve 21. The valve opening degree of the valve 21 may be obtained directly from the valve 21, for example, when the valve 21 has a communication function and can output the valve opening degree by a callback according to a predetermined command.

The water temperature acquisition unit 54 acquires the water temperature of the heat source water sent from the heat source machine 12 to the air han 20 exemplified as the user-side heat load. The water temperature of the heat source water can be acquired based on, for example, a measured value measured by at least one of the forward water temperature sensor 15 and the return water temperature sensor 17. That is, the water temperature acquisition unit 54 may acquire the measured values measured by one or a plurality of water temperature sensors. Further, the water temperature of the heat source water acquired by the water temperature acquisition unit 54 may be the water temperature difference of the water temperature measured by a plurality of water temperature sensors such as the water temperature difference between the outgoing water temperature sensor 15 and the return water temperature sensor 17.

The operation switching unit 55 includes information on whether or not the compressor acquired by the stop information acquisition unit 51 has been stopped, the operation state of the primary side water pump 123 acquired by the operation state acquisition unit 52, and the valve opening degree acquisition unit. Based on the valve opening degree of the valve 21 acquired in 53, the operating state and the stopped state of the primary side water supply pump 123 are switched. Switching between the operating state and the stopped state is switching from the operating state to the stopped state or switching from the stopped state to the operating state.

The operating state of the primary side water supply pump 123 means a state in which the primary side water supply pump 123 is generating power. Therefore, the operating state of the primary side water supply pump 123 may include a state in which a low frequency is applied to the primary side water supply pump 123 and the pump is not rotating due to a rotational load or a brake. The operation switching unit 55 makes it a condition for stopping the heat source machine side pump that the information related to the output frequency is information indicating that the output frequency is equal to or lower than the preset frequency. The information indicating the preset frequency or lower may include information indicating that the rotation speed of the primary side water supply pump 123 at the preset frequency is equal to or lower than the preset rotation speed.

The operation switching unit 55 sets the information related to the output frequency of the primary side water supply pump 123 as a condition for stopping the primary side water supply pump 123, thereby reducing the change in the water supply pressure due to the stoppage of the primary side water supply pump 123. Can be done. Further, the operation switching unit 55 reduces the change in the water temperature of the heat source water due to the stoppage of the primary side water supply pump 123 by making the condition that the compressor is stopped as a condition for stopping the primary side water supply pump 123. be able to.

By the way, the operation switching unit 55 estimates that the load on the user side device is light because the compressor is stopped and the rotation speed of the primary side water supply pump 123 is equal to or lower than the preset rotation speed. can do. However, the timing at which the operation or stop of the compressor is switched and the timing at which the rotation speed of the primary side water supply pump 123 changes include a predetermined time lag after the load state of the user side device changes. For example, when the load state of the user-side device changes, the opening degree of the valve 21 increases. When the valve 21 is in the closed state, the water pressure generated by the secondary side water pump 31 is bypassed by the pressure relief circuit 32, so that the heat source water is actually supplied to the air han 20 after increasing the opening degree of the valve 21. A predetermined time lag will occur until this is done. Further, a predetermined time lag occurs from the time when the heat source water is supplied to the air han 20 until the measured value of the outgoing water temperature sensor 15 or the return water temperature sensor 17 changes. Therefore, a considerable time lag will occur from the change in the load state of the user side device to the start / stop of the compressor or the change in the rotation speed of the primary side water supply pump 123. In the present embodiment, the operation switching unit 55 further sets the information on the valve opening degree of the valve 21 as a condition for stopping the primary side water supply pump 123, so that the primary side water supply pump when the air han 20 is unloaded The power of the 123 can be reduced, and the above-mentioned time lag can be absorbed to improve the responsiveness of the heat source machine 12 to a change in the load state.

As described above, the functions of the stop information acquisition unit 51, the operation state acquisition unit 52, the valve opening degree acquisition unit 53, the water temperature acquisition unit 54, and the operation switching unit 55 of the module controller 121 are realized by software. Explained as a thing. However, at least one or more of the above-mentioned functions of the module controller 121 may be realized by hardware.

Further, any of the above-mentioned functions of the module controller 121 may be executed by dividing one function into a plurality of functions. Further, any two or more of the above functions of the module controller 121 may be integrated into one function.

Further, the module controller 121 may be a device realized by one housing, or may be a system realized by a plurality of devices connected via a network or the like. For example, the module controller 121 may be a virtual device such as a cloud service provided by a cloud computing system. Further, the module controller 121 may be a general-purpose computer such as a server device, or may be a dedicated device having limited functions.

Further, at least one or more of the above-mentioned functions of the module controller 121 may be realized in another device. That is, the module controller 121 does not have to have all the above functions, and may have some functions.

Next, the hardware configuration of the module controller 121 will be described.

The module controller 121 includes a CPU 101, a RAM (Random Access Memory) 102, a ROM (Read Only Memory) 103, an HDD (Hard Disk Drive) 104, an operation unit 105, a display unit 106, and a communication I / F (Interface) 107. ..

As the module controller 121, a general-purpose computer such as a desktop PC (Personal Computer) or a server device can be used. Further, as the module controller 121, a control device dedicated to the heat source machine or an industrial control device such as a PLC (Programmable Logic Controller) may be used. Further, the module controller 121 may share hardware with the central monitoring device 10 or the group controller 122. The module controller 121 executes the heat source water control program described with reference to FIG.

The CPU 101 controls the module controller 121 by executing a heat source water control program stored in the RAM 102, the ROM 103, or the HDD 104. The heat source water control program is acquired from, for example, a recording medium on which the heat source water control program is recorded, a server that provides the program via a network, or the like, is installed in the HDD 104, and is readable and stored in the RAM 102 from the CPU 101.

The operation unit 105 is, for example, a keyboard, a mouse, a switch, or the like that enables operation input to the module controller 121. The display unit 106 has a display function for displaying information, for example, a liquid crystal display, a lamp, or the like. The operation unit 105 and the display unit 106 may be, for example, a touch panel or the like having an operation display function, or may be another external interface connected by communication.

The communication I / F 107 controls communication with other devices via wireless LAN (Local Area Network) communication, wired LAN communication, infrared communication, short-range wireless communication, and the like. The communication I / F 107 controls communication with the cloud server 19 via, for example, the heat source module 120, the group controller 122, or the network 9. The heat source module 120 cools or heats the refrigerant by a plurality of refrigeration cycle devices including a compressor 125, and generates heat source water by heat exchange with water. The module controller 121 controls the primary side water supply pump 123. The group controller 122 controls the compressor 125 provided in each refrigeration cycle of the heat source module 120. The cloud server 19 monitors or records, for example, the operating state of the central monitoring device 10.

Next, the operation of the module controller 121 of the embodiment will be described with reference to FIG. The operation of the flowchart illustrated in FIG. 4 is an operation by each function of the module controller 121 functioning as the heat source water control device described in FIG. 2, and is realized by the CPU 101 executing the heat source water control program. Can be done. Each operation will be described as being executed by the module controller 121.

In FIG. 4, the module controller 121 determines whether or not the compressor is stopped (step S11). Information on whether or not the compressor is stopped can be obtained from, for example, the module controller 121 from the group controller 122. When it is determined that the compressor 125 is not stopped (step S11: NO), the module controller 121 does not change the operating state of the primary side water supply pump 123. Here, it is assumed that the primary side water supply pump 123 is in the operating state at the start of the flowchart.

On the other hand, when it is determined that the compressor 125 is stopped (step S11: YES), the module controller 121 determines whether or not the frequency of the inverter driving the primary side water supply pump 123 is equal to or lower than the set value (step S11: YES). Step S12). Information on the frequency of the inverter can be obtained from, for example, the module controller 121 from the heat source module 120. When it is determined that the frequency of the inverter is not equal to or lower than the set value (step S12), the module controller 121 does not change the operating state of the primary side water supply pump 123.

On the other hand, when it is determined that the frequency of the inverter is equal to or less than the set value (step S12), the module controller 121 determines whether or not the valve opening degree of the valve 21 is equal to or less than the set value (step S13). Information on the valve opening degree can be obtained from, for example, the indicator controller 121 by the module controller 121. When it is determined that the valve opening degree is not equal to or less than the set value (step S13; NO), the module controller 121 does not change the operating state of the primary side water supply pump 123.

On the other hand, when it is determined that the valve opening degree is equal to or less than the set value (step S13; YES), the module controller 121 determines whether or not the water temperature is equal to or less than the temperature T1 exemplified as the preset first condition. Judgment (S step S14). The water temperature can be obtained from, for example, the measured value of the outgoing water temperature sensor 15 or the returning water temperature sensor 17. When it is determined that the water temperature is equal to or lower than the temperature T1 (step S14: YES), the module controller 121 stops the operation of the primary side water supply pump 123 (step S15). By stopping the operation of the primary side water supply pump 123, the power of the primary side water supply pump 123 can be reduced.

On the other hand, when the water temperature is higher than the temperature T1 (step S14: NO), the module controller 121 determines whether or not the water temperature is equal to or higher than the temperature T2, which is exemplified as the preset second condition (S step S16). ). Here, temperature T2> temperature T1. When it is determined that the water temperature is equal to or higher than the temperature T2 (S step S16: YES), the module controller 121 operates the primary side water supply pump 123 (step S17). By setting the temperature T2> the temperature T1, the hunting operation of the primary side water supply pump 123 can be prevented.

On the other hand, when it is determined that the water temperature is lower than the temperature T2 (S step S16: NO), the module controller 121 does not change the operating state of the primary side water supply pump 123. That is, the stopped state of the primary side water supply pump 123 is continued.

After executing the process of step S15, after executing the process of step S17, or when it is determined as NO in the process of steps S11 to S13, the module controller 121 ends the control of the primary side water supply pump 123. It is determined whether or not to do so (step S18). Whether or not the control is terminated can be determined, for example, by acquiring information on whether or not the operation of the heat source module 120 has been terminated. When it is determined that the control is not terminated (step S18: NO), the module controller 121 returns to the process of step S11 and repeats the processes of steps S11 to S18. On the other hand, when it is determined that the control is terminated (step S18: YES), the module controller 121 ends the operation of the flowchart.

As described above, in the present embodiment, the heat source water control method is that the heat source water control device is a compressor of the heat source machine whose operation is controlled based on the water temperature of the heat source water sent from the heat source machine to the heat load on the user side. A stop information acquisition step for acquiring information on whether or not the valve has been stopped, and an operation state acquisition step for acquiring the operating state of the heat source machine side pump whose rotation speed is controlled based on the amount of heat source water sent to the user side heat load. And the valve opening acquisition step of acquiring the valve opening of the valve that adjusts the supply amount of heat source water supplied to the heat load on the user side, and the information on whether or not the compressor acquired in the stop information acquisition step has been stopped. , The operation switching step for switching between the operating state and the stopped state of the heat source machine side pump is executed based on the operating state acquired in the operating state acquisition step and the valve opening acquired in the valve opening degree acquisition step. As a result, the power of the heat source machine can be reduced.

Further, in the heat source water control method in the present embodiment, the heat source water control device acquires information related to the output frequency of the inverter that drives the heat source machine side pump as the operating state in the operating state acquisition step, and in the operation switching step, The heat source pump is stopped when the information related to the output frequency is information indicating that the output frequency is equal to or lower than the preset frequency. As a result, the heat source machine side pump can be stopped when the load of the heat source machine side pump is small.

Further, in the heat source water control method in the present embodiment, the heat source water control device stops the heat source machine side pump when the valve opening degree is equal to or less than a preset opening degree in the operation switching step. As a result, the heat source machine side pump can be stopped when the heat load of the user side device is small.

Further, in the heat source water control method in the present embodiment, the heat source water control device further executes the water temperature acquisition step of acquiring the water temperature, and the acquired water temperature satisfies the preset first condition in the operation switching step. When becomes, the heat source machine side pump is switched from the operating state to the stopped state, and when the acquired water temperature changes from the state where the first condition is satisfied to the state where the second condition is satisfied, the heat source machine side pump is operated from the stopped state. Switch to the state. This makes it possible to prevent the hunting operation of the heat source machine side pump.

Further, in the present embodiment, the heat source water control device operates or stops the heat source machine side pump by the heat source water control method described in any of the above. As a result, the power of the heat source machine can be reduced.

According to at least one embodiment described above, in the heat source water control method, the heat source water control device executes a stop information acquisition step, an operation state acquisition step, a valve opening degree acquisition step, and an operation switching step. As a result, the power of the heat source machine can be reduced.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention.

For example, in the above embodiment, the heat source water control system having the primary side water supply pump, the secondary side water supply pump, and the free bypass circuit has been described, but the heat source water control system is not limited to this embodiment. For example, the secondary side water supply pump may not be provided, and the bypass circuit may have a bypass valve to adjust the flow rate of the heat source water.

These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... heat source water control system, 10 ... central monitoring device, 12 ... heat source machine, 120 ... heat source module, 121 ... module controller (MC) (heat source water controller), 101 ... CPU (Central Processing Unit), 102 ... RAM (Random Access Memory), 103 ... ROM (Read Only Memory), 104 ... HDD (Hard Disk Drive), 105 ... Operation unit, 106 ... Display unit, 107 ... Communication I / F (Interface), 51 ... Stop information Acquisition unit, 52 ... Operating state acquisition unit, 53 ... Valve opening degree acquisition unit, 54 ... Water temperature acquisition unit, 55 ... Operation switching unit, 122 ... Group controller (GC), 120 ... Heat source module, 123 ... Primary side Water supply pump, 125 ... Compressor, 13 ... Free bypass circuit, 15 ... Outflow temperature sensor, 16 ... Water meter, 17 ... Return water temperature sensor, 20 ... Air han, 21 ... Valve, 22 ... Thermometer, 23 ... Instruction adjustment Total, 31 ... secondary side water supply pump, 32 ... pressure relief circuit, 9 ... network, 19 ... cloud server

Claims (4)

The heat source water control device
The stop information acquisition step for acquiring information on whether or not the compressor of the heat source machine whose operation is controlled based on the water temperature of the heat source water sent from the heat source machine to the heat load on the user side is stopped, and
An operation state acquisition step of acquiring the operation state of the heat source machine side pump whose rotation speed is controlled based on the amount of heat source water sent to the user side heat load, and
A valve opening acquisition step of acquiring a valve opening degree of a valve for adjusting the supply amount of the heat source water supplied to the user side heat load, and a valve opening degree acquisition step.
Information on whether or not the compressor has been stopped acquired in the stop information acquisition step, the operating state acquired in the operating state acquisition step, and the valve opening degree acquired in the valve opening degree acquisition step. Based on the operation switching step for switching between the operating state and the stopped state of the heat source machine side pump,
The water temperature acquisition step for acquiring the water temperature and
The execution,
In the operation switching step, when the acquired water temperature meets the preset first condition, the heat source machine side pump is switched from the operating state to the stopped state, and the heat source machine side pump is put into the stopped state. After switching, when the acquired water temperature changes from the state of satisfying the first condition to the state of satisfying the second condition, the heat source machine side pump is switched from the stopped state to the operating state.
Heat source water control method. The heat source water control device
In the operation switching step, information on the output frequency of the inverter that drives the heat source machine side pump is acquired as the operation state.
In the operation switching step, information relating to the output frequency, Ri information der having the following frequencies the output frequency is set in advance, and, in a first condition is satisfied state in which the water temperature obtained is set in advance Oh the heat source-side pump is stopped to Rutoki,
The heat source water control method according to claim 1. The heat source water control device
In the operation switching step, the valve opening is preset opening less der is, and, the heat source-side pump to the first condition is satisfied state der Rutoki said temperature obtained is set in advance To stop
The heat source water control method according to claim 1 or 2. The heat source machine side pump is started or stopped by the heat source water control method according to any one of claims 1 to 3.
Heat source water control device.

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