WO2024062531A1 - 熱源システム、空調システム、制御方法およびプログラム - Google Patents

熱源システム、空調システム、制御方法およびプログラム Download PDF

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Publication number
WO2024062531A1
WO2024062531A1 PCT/JP2022/035005 JP2022035005W WO2024062531A1 WO 2024062531 A1 WO2024062531 A1 WO 2024062531A1 JP 2022035005 W JP2022035005 W JP 2022035005W WO 2024062531 A1 WO2024062531 A1 WO 2024062531A1
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Prior art keywords
heat source
source device
capacity
controller
heat
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Ceased
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PCT/JP2022/035005
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English (en)
French (fr)
Japanese (ja)
Inventor
暁 三枝
哲爾 藤野
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Mitsubishi Heavy Industries Thermal Systems Ltd
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Mitsubishi Heavy Industries Thermal Systems Ltd
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Publication date
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Priority to PCT/JP2022/035005 priority Critical patent/WO2024062531A1/ja
Priority to EP22959495.7A priority patent/EP4589209A4/en
Priority to JP2024547972A priority patent/JPWO2024062531A1/ja
Publication of WO2024062531A1 publication Critical patent/WO2024062531A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—Component parts or details not otherwise provided for in this subclass
    • F25B2400/06—Several compression cycles arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/23—Time delays

Definitions

  • the present disclosure relates to a heat source system, an air conditioning system, a control method, and a program.
  • an air conditioning system that includes a heat source system having a plurality of heat source devices and a user-side unit that performs air conditioning using a heat medium supplied from the heat source system (for example, see Patent Document 1).
  • number control is performed to control the number of operating heat source devices according to the required capacity requested by the user side unit.
  • the operating heat source device is switched at predetermined time intervals so that the load does not concentrate on the operating heat source device due to long-term operation of a specific heat source device.
  • the stop-side heat source machine When switching the heat source machine to be operated, if the heat source machine that has been in operation (hereinafter referred to as the "stop-side heat source machine") is stopped, the heat source machine can be stopped relatively quickly. On the other hand, when starting a heat source device that has been stopped until now (hereinafter referred to as “starting side heat source device”), it takes a relatively long time until the output becomes stable. For this reason, when switching between operating heat source devices, there is a temporary shortage of output compared to the required capacity.
  • the present disclosure has been made in view of these circumstances, and aims to provide a heat source system, an air conditioning system, a control method, and a program that can reduce the insufficient output of cooling and heating capacity when switching heat source devices. purpose.
  • a heat source system is a heat source system that supplies a heat medium to a user unit, and includes a plurality of heat source devices and a heat source system according to a required capacity required by the user unit. and a controller for controlling a plurality of the heat source devices, the controller providing a protective startup period in which a newly started first heat source device is operated at a constant output at the time of switching the operating heat source devices, After the protection start period has elapsed, the second heat source device to be switched is stopped.
  • An air conditioning system includes the above heat source system and an air handling unit to which a heat medium is supplied from the heat source system.
  • a method of controlling a heat source system is a method of controlling a heat source system that includes a plurality of heat source devices and supplies a heat medium to a user unit, the heat source device being operated.
  • a protection start period is provided in which the newly started first heat source device is operated at a constant output, and after the protection start period has elapsed, the second heat source device to be switched is stopped.
  • a program according to one aspect of some embodiments of the present disclosure is a program for causing a computer to function as the controller.
  • FIG. 1 is a diagram showing an overall schematic configuration of an air conditioning system according to an embodiment of the present disclosure.
  • 1 is a diagram showing a schematic configuration of a heat source system according to an embodiment of the present disclosure.
  • 1 is a diagram illustrating a configuration example of a refrigerant circuit of a heat source device according to an embodiment of the present disclosure.
  • 1 is a diagram schematically showing the overall configuration of a control system that controls an air conditioning system according to an embodiment of the present disclosure. It is a diagram showing an example of the hardware configuration of a heat source device controller according to an embodiment of the present disclosure.
  • FIG. 2 is a functional block diagram showing an example of functions included in a heat source device controller according to an embodiment of the present disclosure.
  • FIG. 3 is an example diagram of control for keeping the output capacity of a heat source device constant in rotation control of a heat source system according to an embodiment of the present disclosure.
  • 13 is an example diagram showing the transition of target capacity transmitted to each heat source unit in rotation control according to an embodiment of the present disclosure.
  • FIG. 3 is an example diagram of changes in output capacity of each heat source device in rotation control according to an embodiment of the present disclosure.
  • FIG. 1 is a diagram showing the overall schematic configuration of an air conditioning system according to an embodiment of the present disclosure.
  • the air conditioning system 1 includes a direct expansion air handling unit (hereinafter referred to as "AHU") 2 and a heat source system 3.
  • AHU direct expansion air handling unit
  • the AHU 2 will be described as an example of the user unit, but the usage side unit is not limited to this.
  • the user unit may be another type of air handling unit, such as a cold/hot water type air handling unit.
  • the user-side unit is not limited to an air handling unit, and may be any system that performs air conditioning using a heat medium supplied from a heat source system.
  • the AHU 2 performs air conditioning and ventilation of an air-conditioned space (for example, indoor R in FIG. 1) in various buildings such as offices, commercial buildings, hospitals, and factories.
  • the AHU 2 includes, for example, a total heat exchanger (not shown), a heat exchanger 21 (21a, 21b, 21c), a temperature sensor 22 (22a, 22b, 22c), a fan 23, and a temperature sensor 24. It is equipped with The heat exchanger 21 (21a, 21b, 21c), the temperature sensor 22 (22a, 22b, 22c), the fan 23, and the temperature sensor 24 are arranged in the housing 7, for example.
  • the total heat exchanger exchanges heat between the air taken in from outside and the air taken in from indoors R.
  • the air that has undergone heat exchange with the air from the room R in the total heat exchanger is sent to the heat exchanger 21.
  • the heat exchanger 21 exchanges heat between air and a heat medium (in this embodiment, a refrigerant) supplied from the heat source system 3. Air cooled or heated by heat exchange with the heat medium is sucked into the fan 23 .
  • the fan 23 sends out the sucked air.
  • the air sent out from the fan 23 is sent to the room R, which is the air-conditioned space, after passing through the pipes.
  • a temperature sensor 22 is provided in the heat exchanger 21. Note that the installation position of the temperature sensor 22 is not limited to this example, and may be any position that can detect the temperature of the air after heat exchange in the heat exchanger 21.
  • the system controller 10 calculates the required capacity based on the difference between the set temperature set by the remote controller (not shown) and the temperature detected by the temperature sensor 24, and outputs the calculated capacity to the heat source system 3. For example, the system controller 10 calculates the required capacity by performing feedback control based on the difference between the set temperature and the detected temperature. Note that the calculation of the required capacity is publicly known, and various publicly known techniques may be adopted as appropriate.
  • system controller 10 controls the rotation speed of the fan 23. Note that for control by the system controller 10, a known technique may be adopted, and detailed description thereof will be omitted here.
  • the heat source system 3 includes heat source device controllers 8 (8a, 8b, 8c), and for example, the heat source device controller (controller) 8a is used as a master device.
  • the heat source device controller 8a controls the operating conditions and output capacity of each heat source device 5 (5a, 5b, 5c) via each heat source device controller 8.
  • the heat source device controller 8 may control the operating conditions and output capacity of each heat source device 5 based on input information input by the remote controller 29.
  • the heat source system 3 includes a plurality of heat source devices 5 (see FIG. 2), and supplies a heat medium to the AHU 2.
  • FIG. 2 is a diagram showing a schematic configuration of the heat source system 3.
  • the heat source system 3 includes a plurality of heat source machines (outdoor units) 5a, 5b, and 5c.
  • the heat exchanger 21 included in the AHU 2 has, for example, a configuration in which a plurality of heat exchangers 21a, 21b, and 21c are integrated.
  • the heat source device 5a is configured to individually supply a heat medium to the heat exchanger 21a, the heat source device 5b to the heat exchanger 21b, and the heat source device 5c to the heat exchanger 21c.
  • the correspondence between the heat source device 5 and the heat exchanger 21 is not limited to this example, and a known refrigerant connection form can be adopted as appropriate.
  • heat source machines 5a, 5b, etc. when it is necessary to distinguish between the heat source machines 5a, 5b, etc., they are referred to as heat source machines 5a, 5b, etc., and when there is no need to distinguish them, they are simply referred to as heat source machine 5.
  • other configurations will be treated in the same manner.
  • FIG. 3 shows an example of the configuration of the refrigerant circuit of the heat source unit 5a.
  • the refrigerant circuits of the heat source units 5b and 5c also have the same configuration.
  • the heat source device 5a is a heat pump type heat source device and includes a compressor 11 that compresses refrigerant.
  • the compressor 11 is, for example, a variable rotation speed compressor driven by an inverter motor (not shown).
  • the output of the heat source device 5a is controlled by controlling the frequency (rotational speed) of the inverter motor of the compressor 11 by a heat source device controller 8a, which will be described later.
  • the compressor 11 is not limited to this example, and may be a fixed speed compressor with a fixed rotation speed, for example.
  • the heat source device 5a also includes a heat exchanger 13 that exchanges heat between the refrigerant and the outside air, a fan 14, an electronic expansion valve 16 that expands the refrigerant, and the like. Furthermore, the heat source device 5a may include a switching valve (for example, a four-way switching valve) 12 that switches the circulation direction of the refrigerant. By providing the switching valve 12, it becomes possible to support both cooling and heating. Further, the heat source device 5a may include an accumulator 15 provided on the suction side piping of the compressor 11 for the purpose of separating refrigerant into gas and liquid.
  • a switching valve for example, a four-way switching valve
  • the heat exchanger 21a included in the AHU 2 shares a refrigerant pipe with the heat source device 5a, and is configured to be directly supplied with refrigerant from the heat source device 5a.
  • refrigerant circulating in refrigerant piping is a slightly flammable refrigerant with a low GWP (global-warming potential).
  • alternative refrigerants in general under HFC refrigerant regulations to prevent global warming for example, R1234yf [4], R1234ze (E) [4], R1233zd (E) [5], R32 [675], etc.
  • the number in square brackets indicates the GWP (100-year value)
  • a refrigerant having a GWP (100-year value) equivalent to that for example, R1234yf [4], R1234ze (E) [4], R1233zd (E) [5], R32 [675], etc.
  • the number in square brackets indicates the GWP (100-year value)
  • a refrigerant having a GWP (100-year value) equivalent to that for example, R1234yf [4], R1234ze (E) [4], R1233zd (E) [
  • Fig. 4 is a diagram showing an overall configuration of a control system for controlling the air conditioning system according to the present embodiment.
  • the air conditioning system 1 includes a system controller 10 and heat source unit controllers 8 (8a, 8b, 8c).
  • the system controller 10 and the heat source unit controllers 8 (8a, 8b, 8c) are connected to each other via a communication line and are configured to be capable of two-way communication.
  • the heat source device controller 8a which is a master device, controls the heat source system 3. For example, the heat source device controller 8a performs number control to control the number of operating heat source devices 5 according to the required capacity required by the AHU 2 and/or input information from the remote controller 29. Further, the heat source device controller 8a may perform capacity distribution control to allocate output capacity to the heat source devices 5.
  • the heat source device controller 8a transmits, for example, a start command, a stop command, and a target capacity command to each heat source device controller 8.
  • the heat source device controller 8 controls the drive of the compressor 11 etc. (see FIG. 3) based on the required capacity required by the AHU 2 received from the system controller 10. Further, the rotation speed of the compressor 11 is controlled based on the target capacity command.
  • the heat source equipment controller 8 has an arithmetic expression or table for converting a target capacity command into a frequency command for the compressor 11, and uses this information to control the rotation speed of the compressor 11 according to the target capacity command. I do.
  • capacity control output control
  • FIG. 5 is a diagram showing an example of the hardware configuration of the heat source device controller 8.
  • the heat source device controller 8 includes, for example, a CPU (Central Processing Unit) 31, a main memory 32, a secondary storage 33, a communication interface 34, etc. It is equipped with These units are connected to each other directly or indirectly via a bus, and cooperate with each other to execute various processes.
  • a CPU Central Processing Unit
  • the CPU 31 controls the entire heat source system using an OS (Operating System) stored in a secondary storage device 33 connected via a bus, and also executes various programs stored in the secondary storage device 33. By doing so, various processes are executed.
  • OS Operating System
  • One or more CPUs 31 may be provided and may cooperate with each other to realize processing.
  • the main storage device 32 is composed of a writable memory such as a cache memory and a RAM (Random Access Memory), and is used as a work area for reading an execution program of the CPU 31, writing processing data by the execution program, etc. .
  • the secondary storage device 33 is a non-transitory computer readable storage medium.
  • the secondary storage device 33 is, for example, a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Examples of the secondary storage device 33 include ROM (Read Only Memory), HDD (Hard Disk Drive), SSD (Solid State Drive), and flash memory.
  • the secondary storage device 33 includes, for example, an OS, BIOS (Basic Input/Output System), and peripheral devices for controlling the entire heat source system such as Windows (registered trademark), iOS (registered trademark), and Android (registered trademark). It stores various device drivers for operating the hardware, various application software, and various data and files.
  • the secondary storage device 33 stores programs for implementing various processes and various data required for implementing various processes.
  • a plurality of secondary storage devices 33 may be provided, and the above programs and data may be stored in each secondary storage device 33 in a divided manner.
  • the secondary storage device 33 may be provided on the cloud, and some programs and data stored in the secondary storage device 33 may be provided on the cloud.
  • the communication interface 34 functions as an interface for communicating with other devices via a communication line and transmitting and receiving information.
  • the communication interface 34 communicates with other devices by wire or wirelessly.
  • wireless communication include communication through lines such as Bluetooth (registered trademark), Wi-Fi, mobile communication systems (3G, 4G, 5G, 6G, LTE, etc.), and wireless LAN.
  • wired communication is communication through a line such as a wired LAN (Local Area Network).
  • system controller 10 is also a computer, and has the same configuration as the heat source device controller 8 described above.
  • FIG. 6 is a functional block diagram showing an example of functions provided in the heat source machine controller 8a.
  • the heat source machine controller 8a includes a memory unit 41, a number control unit 42, and a capacity allocation unit 43.
  • the storage unit 41 includes operation priority information (for example, an operation priority table) in which operation priorities for each heat source device 5a, 5b, and 5c are set, and rated capacities for each heat source device 5a, 5b, and 5c.
  • rated capacity information for example, a rated capacity table
  • a start threshold for starting each heat source device and a stop threshold for stopping the heat source device are stored.
  • the storage unit 41 stores a rate (rate of change) at which the target ability is increased or decreased, which will be described later.
  • the priorities are set in the order of heat source devices 5a, 5b, and 5c, and a startup threshold for starting the heat source device 5b, a startup threshold for starting the heat source device 5c, and a startup threshold for starting the heat source device 5c.
  • a stop threshold for stopping the heat source device 5b and a stop threshold for stopping the heat source device 5b are set.
  • Each start threshold value and each stop threshold value are appropriately set in consideration of the rated capacity and start priority order of each heat source device 5.
  • the driving priority set in the driving priority information may be changed at predetermined time intervals. This makes it possible to reduce the deviation in cumulative operating time of each heat source device.
  • the number control unit 42 controls the number of heat source devices 5. For example, if it is necessary to start up a plurality of heat source devices 5 to satisfy the required capacity required by the AHU 2, the number control unit 42 controls the number of heat source devices 5 until the number of activated heat source devices 5 reaches the required number determined from the required capacity. , the heat source device 5 is started in stages.
  • the number control unit 42 increases the target capacity for controlling the heat source system 3 from zero to the required capacity at a predetermined rate, and starts the heat source equipment 5 based on this target capacity.
  • the number control unit 42 increases or decreases the target capacity at a predetermined rate up to the changed required capacity, and controls the number of heat source units based on the target capacity. Controls the start or stop of 5.
  • the predetermined rate may be a fixed value or a value that is dynamically changed. Furthermore, the predetermined rate may be set for each heat source device, for example, depending on the rated capacity of each heat source device.
  • the capacity allocation unit 43 refers to the rated capacity information stored in the memory unit 41 and allocates capacity so as not to exceed the rated capacity of each heat source unit 5.
  • Various capacity allocation methods have been proposed, so publicly known technology may be adopted. Examples of allocation methods include a method in which, when multiple heat source units 5 are in operation, the target capacity command of one of the heat source units 5 is changed according to fluctuations in the required capacity and the remaining heat source units 5 are operated at their rated capacity, a method in which capacity is evenly distributed to multiple heat source units 5, and a method in which information on the optimal capacity rate range in which the coefficient of performance (COP) of each heat source unit 5 is equal to or greater than a predetermined value is set in advance for each heat source unit 5, and capacity is allocated so that the capacity rate of each heat source unit 5 falls within its respective optimal capacity rate range.
  • COP coefficient of performance
  • system controller 10 when the system controller 10 serves as a master machine that controls the heat source system 3, the system controller 10 may have the same function as the heat source machine controller 8a. In that case, each heat source device controller 8 is a slave device that operates according to instructions from the system controller 10. Moreover, when the heat source system 3 is controlled by the system controller 10, the system controller 10 is equipped with the structure and function for implement
  • FIG. 7 is a diagram for explaining rotation control of the heat source system according to this embodiment.
  • the following explanation assumes that the required capacity is 80% of the rated capacity of one heat source device, the output capacity of each heat source device is the same, and the priority is set in the order of heat source devices 5a, 5b, and 5c. This will be explained with an example.
  • state 1 in FIG. 7 is a diagram showing the state before switching the heat source device. In state 1, 80% of the target capacity is assigned to the heat source device 5a, so that the required capacity of the user unit is covered by the heat source device 5a. In this state, the heat source devices 5b and 5c are in a stopped state.
  • state 2 in FIG. 7 is a diagram showing a state at the time of switching the heat source device, specifically, a state during the protection start period.
  • the capacity distribution unit 43 determines the target capacity of each heat source device 5a, 5b by distributing the required capacity to the heat source device 5a, 5b, and both heat source devices 5a, 5b. Drive both 5b.
  • the capacity allocation unit 43 allocates a certain target capacity to the newly activated heat source device 5b (first heat source device). For example, the capacity allocation unit 43 allocates the minimum capacity of 25% to the heat source device 5b.
  • the capacity allocation unit 43 also adjusts the heat source so that the sum of the target capacities assigned to the heat source machines 5a and 5b matches the target capacity assigned to the heat source machine 5a (second heat source machine) immediately before the heat source machine switching. Assign the target capability of aircraft 5a. Further, the controller 8a sets the priority of the heat source device controller 8a corresponding to the heat source device 5a to be stopped to the lowest priority, and sets the priority of the heat source device controller 8b corresponding to the heat source device 5b to be newly started to the highest priority. Set to .
  • State 3 in FIG. 7 is a diagram showing the state after switching the heat source device.
  • state 3 80% of the target capacity is assigned to the heat source device 5b, so that the required capacity of the user unit is covered by the heat source device 5b.
  • FIG. 8 is an example diagram of changes in target capacity assigned to each heat source machine in rotation control.
  • FIG. 9 is an example diagram of the transition of the output capacity of each heat source device in rotation control.
  • the broken line is the target capacity or output capacity corresponding to the heat source device 5a.
  • the dashed-dotted line is the target capacity or output capacity corresponding to the heat source device 5b.
  • the solid line is the target capacity or output capacity corresponding to the heat source device 5c.
  • the rotation control in this embodiment will be described below with reference to FIG. 8 and FIG.
  • the required capacity of the user side units is covered by allocating a target capacity of 80% to the heat source unit 5a.
  • the heat source unit 5a operates at an output capacity of 80% based on a target capacity of 80% until the rotation time t1.
  • the heat source device controller 8a transmits a start command to the heat source device controller 8b. Then, the heat source device controller 8b starts the heat source device 5b based on the startup command. Further, at the rotation time t1 in FIG. 8, the capacity allocation unit 43 allocates 25%, which is the minimum capacity, to the heat source device 5b as the target capacity to the newly activated heat source device 5b. The capacity allocation unit 43 also assigns a target capacity to the heat source machine 5a so that the sum of the target capacities assigned to the heat source machines 5a and 5b matches 80% of the target capacity assigned to the heat source machine 5a before the rotation time t1. Assign 55% capacity.
  • the target capacities of the heat source devices 5a and 5b are kept constant, and furthermore, the sum of these target capacities is equal to the target capacity of the heat source device 5a before the rotation time t1. be done. Thereby, it is possible to suppress a decrease in the output capacity of the heat source system.
  • the heat source device controllers 8a, 8b control the driving frequency of the compressors of the heat source devices 5a, 5b based on the target capacity allocated to each of the heat source devices 5a, 5b. As a result, as shown in FIG. 9, the output capacity of the heat source device 5a decreases at a predetermined rate toward the target capacity of 55%, and the output capacity of the heat source device 5b increases at a predetermined rate toward the target capacity of 25%. .
  • the heat source device controller 8a After time t2, that is, at the end of the protection start period, the heat source device controller 8a reduces the drive frequency of the heat source device 5a at a constant rate of change based on the stop command, and stops the heat source device 5a.
  • the capacity allocation unit 43 allocates 80% of the target capacity, which was the target capacity of the heat source machine 5a before the rotation time t1, to the heat source machine 5b.
  • the heat source machine controller 8a increases the drive frequency of the heat source machine 5b at a constant rate of change, and makes the output capacity of the heat source machine 5b 80% of the target capacity.
  • the heat source device controllers 8a and 8b ensure that the sum of the output capacities of the heat source devices 5a and 5b matches the required capacity of the user unit during a period in which the output capacities of the heat source devices 5a and 5b change at a constant rate of change.
  • the heat source devices 5a and 5b may be operated so as to.
  • the heat source device controller 8a controls the heat source device controller 8c as in the case of switching the operation of the heat source device 5a and the heat source device 5b.
  • the heat source device 5c is activated by the heat source device controller 8c.
  • the priority of the newly started heat source device 5 is updated to the highest priority, and the priority of the heat source device to be stopped is updated to the lowest priority. This makes it possible to reduce the deviation in cumulative operating time of each heat source device.
  • the heat source machine controller 8a controls each heat source machine controller 8 according to the required capacity of the user unit
  • a plurality of heat source devices 5 may be newly activated via the above process.
  • the timing to start switching the heat source devices may be when a certain period of time has elapsed since the heat source device 5 was started, or when the cumulative operating time of the heat source devices has reached a predetermined time. .
  • the target capacity of the heat source device 5 before the protection start period is the minimum capacity of the heat source device 5 to be stopped and the heat source device 5 to be newly started. If the total capacity is lower than the sum of the minimum capacities, the heat source device controller 8a operates the stop-side heat source device and the start-side heat source device at their respective minimum capacities via each heat source device controller 8. Such control can prevent the output capacity of the heat source device 5 from becoming insufficient with respect to the required capacity of the user unit when the heat source device 5 is switched.
  • the target capacity of the heat source device 5 before the protection startup period that is, the required capacity of the user unit
  • the required capacity of the user unit is extremely low, for example, if it is below the minimum capacity of the heat source device 5 to be newly started, the heat source to be stopped.
  • the machine 5 may be stopped during the protective start period. In this way, if the minimum capacity of the heat source device 5 to be newly started is not insufficient for the required capacity of the user unit, energy efficiency can be improved by stopping the heat source device to be stopped during the protective start period. can be improved.
  • the controller 8 controls the first heat source device 5b to be newly activated when switching the operating heat source device 5.
  • a protective start period is provided during which the heat source device 5a is operated at a constant output, and the second heat source device 5a to be switched is stopped after the protective start period has elapsed.
  • the heat source machine controller 8a controls the start and stop of the heat source machine 5 and allocates the target capacity, but this is not limited to the example.
  • the system controller 10 may control the start and stop of the heat source machine 5 and allocate the target capacity based on the calculated required load. That is, the system controller 10 may have the functions of the number control unit 42 and capacity allocation unit 43 shown in FIG. 6.
  • a heat source system (3) is a heat source system that supplies a heat medium to a user unit (2), and includes a plurality of heat source devices (5) and a heat source that is required by the user unit (2).
  • a controller (8) that controls the number of operating heat source devices according to the required capacity, and the controller controls the number of newly activated first heat source devices (5b ) is operated at a constant output, and after the protection start period has elapsed, the second heat source device (5a) to be switched is stopped.
  • the state in which the first heat source machine and the second heat source machine are operated can be maintained during the protection startup period. Therefore, it becomes possible to suppress a decrease in cooling and heating capacity.
  • the controller may be arranged such that the sum of the target capacities assigned to the first heat source device and the second heat source device is determined before the protection start period.
  • a target capacity may be assigned to each of the first heat source machine and the second heat source machine during the protection startup period so as to match the target capacity assigned to the two heat source machines.
  • the sum of the target capacities assigned to the first heat source machine and the second heat source machine during the protection start period matches the target capacity assigned to the second heat source machine before the protection start period. This makes it possible to prevent a significant drop in output when switching between heat source devices.
  • the controller has a minimum capacity that is the minimum output capacity that the first heat source device can output during the protection start period. It is also possible to assign .
  • the controller allocates the minimum capacity, which is the minimum output capacity that one heat source device can output, during the protection startup period. Thereby, by allocating the minimum output capacity to the first heat source device, the remaining capacity can be covered by the unit that stops without impairing the required capacity.
  • the target capacity assigned to the second heat source device before the protection start period is the same as that of the first heat source device and the second heat source device. If it is less than the sum of the respective minimum capacities, during the protection start period, the minimum capacity is assigned to the first heat source machine and the second heat source machine, or the minimum capacity is assigned to the heat source machine and the second heat source machine is It is also possible to stop the heat source device.
  • the output capacity of the heat source machine before the protection start period is less than or equal to the sum of the respective minimum capacities of the first heat source machine and the second heat source machine
  • the output capacity of the first heat source machine and the second heat source machine Assign the minimum capacity to the heat source machine. This makes it possible to avoid insufficient output capacity when switching heat source devices.
  • the output capacity assigned to the heat source device before the protection start period is close to the minimum capacity of the second heat source device, even if the second heat source device is stopped, the entire heat source system will be The output does not change much. Therefore, in such a case, energy efficiency can be improved by stopping the second heat source device.
  • a heat source system in any one of the first to fourth aspects, is provided with a heat source device that is provided corresponding to each of the plurality of heat source devices and that controls the corresponding heat source device.
  • a controller may be provided, and any one of the heat source device controllers may include the controller.
  • An air conditioning system (1) includes a heat source system (3) of the present disclosure, and air to which a heat medium is supplied from the heat source system, in any of the first to fifth aspects.
  • a method for controlling a heat source system (3) is a method for controlling a heat source system that includes a plurality of heat source devices (5) and supplies a heat medium to a user unit (2), At the time of switching the heat source device, a protection start period is provided in which the newly started first heat source device is operated at a constant output, and after the protection start period has elapsed, the second heat source device to be switched is stopped.
  • a program according to an eighth aspect of the present disclosure is a program for causing a computer to function as the controller in any of the first to fifth aspects.
  • Air conditioning system 2 AHU (direct expansion air handling unit) (user side unit) 3: Heat source system 5: Heat source machine 5a: Heat source machine 5b: Heat source machine 5c: Heat source machine 7: Housing 8: Heat source machine controller 8a: Heat source machine controller (master) 8b: Heat source machine controller (slave 1) 8c: Heat source machine controller (slave 2) 10: System controller 11: Compressor 12: Switching valve 13: Heat exchanger 14: Fan 15: Accumulator 16: Electronic expansion valve 21: Heat exchanger 21a: Heat exchanger 21b: Heat exchanger 21c: Heat exchanger 22: Temperature sensor 22a: Temperature sensor 22b: Temperature sensor 22c: Temperature sensor 23: Fan 24: Temperature sensor 29: Remote controller 31: CPU 32: Main storage device 33: Secondary storage device 34: Communication interface 41: Storage unit 42: Number of units control unit 43: Capacity distribution unit

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
PCT/JP2022/035005 2022-09-20 2022-09-20 熱源システム、空調システム、制御方法およびプログラム Ceased WO2024062531A1 (ja)

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PCT/JP2022/035005 WO2024062531A1 (ja) 2022-09-20 2022-09-20 熱源システム、空調システム、制御方法およびプログラム
EP22959495.7A EP4589209A4 (en) 2022-09-20 2022-09-20 HEAT SOURCE SYSTEM, AIR CONDITIONING SYSTEM, CONTROL METHOD AND PROGRAM
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS599442A (ja) * 1982-07-08 1984-01-18 Yamatake Honeywell Co Ltd 熱源機器の制御方法
JPS599440A (ja) * 1982-07-08 1984-01-18 Yamatake Honeywell Co Ltd 熱源機器の制御方法
JP2017062109A (ja) * 2017-01-11 2017-03-30 株式会社Ｎｔｔファシリティーズ 台数制御装置および台数制御方法
JP2021139512A (ja) 2020-03-02 2021-09-16 株式会社富士通ゼネラル 空気調和装置および空気調和方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3306612B2 (ja) * 1995-03-24 2002-07-24 株式会社山武 熱源機の運転台数制御方法
JP7017406B2 (ja) * 2017-12-27 2022-02-08 三菱重工サーマルシステムズ株式会社 制御装置、冷凍機システム、制御方法及びプログラム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS599442A (ja) * 1982-07-08 1984-01-18 Yamatake Honeywell Co Ltd 熱源機器の制御方法
JPS599440A (ja) * 1982-07-08 1984-01-18 Yamatake Honeywell Co Ltd 熱源機器の制御方法
JP2017062109A (ja) * 2017-01-11 2017-03-30 株式会社Ｎｔｔファシリティーズ 台数制御装置および台数制御方法
JP2021139512A (ja) 2020-03-02 2021-09-16 株式会社富士通ゼネラル 空気調和装置および空気調和方法

Non-Patent Citations (1)

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Title
See also references of EP4589209A4

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