WO2018025382A1 - Heat source system - Google Patents
Heat source system Download PDFInfo
- Publication number
- WO2018025382A1 WO2018025382A1 PCT/JP2016/073000 JP2016073000W WO2018025382A1 WO 2018025382 A1 WO2018025382 A1 WO 2018025382A1 JP 2016073000 W JP2016073000 W JP 2016073000W WO 2018025382 A1 WO2018025382 A1 WO 2018025382A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- heat source
- fluid
- heat exchanger
- flow rate
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 138
- 238000010257 thawing Methods 0.000 claims abstract description 83
- 239000003507 refrigerant Substances 0.000 claims abstract description 62
- 230000006837 decompression Effects 0.000 claims abstract description 6
- 238000007710 freezing Methods 0.000 claims description 79
- 230000008014 freezing Effects 0.000 claims description 79
- 238000001704 evaporation Methods 0.000 claims description 64
- 230000008020 evaporation Effects 0.000 claims description 63
- 238000013459 approach Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 115
- 239000002609 medium Substances 0.000 description 74
- 238000010438 heat treatment Methods 0.000 description 25
- 230000007423 decrease Effects 0.000 description 14
- 238000001816 cooling Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002528 anti-freeze Effects 0.000 description 1
- 238000002194 freeze distillation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/136—Defrosting or de-icing; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/215—Temperature of the water before heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/219—Temperature of the water after heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/227—Temperature of the refrigerant in heat pump cycles
- F24H15/231—Temperature of the refrigerant in heat pump cycles at the evaporator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/335—Control of pumps, e.g. on-off control
- F24H15/34—Control of the speed of pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/375—Control of heat pumps
- F24H15/38—Control of compressors of heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
- F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/242—Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/281—Input from user
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- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/003—Indoor unit with water as a heat sink or heat source
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- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/029—Control issues
- F25B2313/0294—Control issues related to the outdoor fan, e.g. controlling speed
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- 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
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- 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
- F25B2600/13—Pump speed control
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- 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
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2116—Temperatures of a condenser
- F25B2700/21161—Temperatures of a condenser of the fluid heated by the condenser
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2116—Temperatures of a condenser
- F25B2700/21162—Temperatures of a condenser of the refrigerant at the inlet of the condenser
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the temperature determination means 52 acquires temperature information from the inlet temperature sensor 16 and determines whether the water temperature is high or low. Specifically, during the defrosting operation, it is determined whether or not the inlet temperature Twi measured by the inlet temperature sensor 16 is lower than the first set temperature T1, and the determination result is transmitted to the operation control means 51. Further, during the defrosting operation, it is determined whether or not the measured inlet temperature Twi is lower than the second set temperature T2, and the determination result is transmitted to the operation control means 51 or the freezing determination means 53 according to the determination result.
- the temperature determination unit 52 refers to the first set temperature T1 and the second set temperature T2 stored in the storage unit 54.
- the storage means 54 is composed of a memory such as a ROM, for example, and stores the first set temperature T1, the second set temperature T2, and the freezing threshold information T3 in advance.
- the first set temperature T1 is an inlet temperature at a boundary at which a decrease in the water temperature of the hydrothermal medium delivered from the heat source system 100 becomes noticeable, for example, when the heat source unit 1 performs a defrosting operation.
- the first set temperature T1 may be configured to be automatically set based on the cooling capacity of the refrigerant circuit, the target outlet temperature, the normal water flow rate, and the like.
- the second set temperature T2 is a temperature lower than the first set temperature, for example, and higher than the normal freezing temperature of the heat medium side heat exchanger 8.
- the operation control means 51 receives the notification from the temperature determination means 52, and when the inlet temperature Twi is equal to or lower than the first set temperature T1 (step ST102; YES), increases the supplied water flow rate FR (step ST103). ). Specifically, the rotational speed of the fluid pump 20 is increased to “maximum” (for example, 60 Hz) via the pump control device 21 to suppress a decrease in the outlet temperature Two relative to the inlet temperature Twi. On the other hand, when the inlet temperature Twi is higher than the first set temperature T1, the operation control means 51 sets the supplied water flow rate FR as the normal water flow rate (step ST104). After performing step ST103 or step ST104, the operation control means 51 returns to step ST101 and repeats the fluid flow rate control in steps ST101 to ST104. When the heating operation ends, the operation control means 51 ends the fluid flow control.
- “maximum” for example, 60 Hz
- the operation control means 51 determines that the heat medium side heat exchanger 8 is not frozen and continues the defrosting operation (step). ST115).
- the operation control means ends or continues the defrosting operation in step ST114 or step ST115, and then returns to step ST111 to repeat the freezing control.
- the operation control means ends the freezing control when the heating operation ends.
- the heat source system 100 includes the heat source unit 1 that heats and cools the fluid and the control device 50 that controls the heat source unit 1.
- the heat source unit 1 includes the compressor 3.
- the refrigerant circuit 2 in which the refrigerant flow switching device 4, the air-side heat exchanger 5, the decompression device 7, and the heat medium-side heat exchanger 8 are connected via the refrigerant pipe 11, and the heat medium-side heat exchanger 8.
- the threshold value freeze evaporation temperature Tf
- Tf freeze evaporation temperature
- the operation control means 51 adjusts the drive frequency of the corresponding fluid pump 20 to change the supplied fluid flow rate FR.
- the supplied fluid flow rate FR is increased, the operation frequency of the fluid pump 20 is increased. Is increased and the fluid flow rate FR to be supplied is decreased, the drive frequency of the fluid pump 20 is decreased.
- the control device 50 can change the water flow rate FR in multiple stages by transmitting a control signal corresponding to the target water flow rate. Can do.
- the operation control means 51 sets the water flow rate FRa of the heat source unit 1a during defrosting to a small water flow rate (step ST205). . Specifically, the operation control means 51 makes the drive frequency of the fluid pump 20a small (for example, 30 Hz). Moreover, the operation control means 51 makes the water flow rates FRb and FRc of the heat source units 1b and 1c that are not defrosted to a large flow rate (step ST206). Specifically, the operation control means 51 increases the drive frequency of the fluid pumps 20b and 20c (for example, 50 Hz). In step ST204, step ST206, or step ST207, the operation control means 51 sets the flow rate of each fluid pump, and then returns to step ST201 to repeat the fluid flow rate control. When the heating operation ends, the operation control means 51 ends the fluid flow control.
- the operation control means 51 ends the fluid flow control.
- step ST204 the operation control means 51 sets the water flow rates FRb and FRc of the heat source units 1b and 1c not being defrosted to the normal water flow rate, but is not limited thereto. For example, if the water flow rates FRb and FRc are increased, the heat source unit 1a can be backed up. In step ST203, since the heat source unit 1a also has the maximum water flow rate, there is a concern that the total water amount increases when the heat source units 1b and 1c are operated at a large water flow rate. Therefore, the operation control means 51 may be configured to set the water flow rates FRb and FRc of the heat source units 1b and 1c to a low water flow rate in step ST204.
- the heat source system 100 includes a plurality of heat source units 1a to 1c, and the plurality of heat source units 1a to 1c are connected in parallel to the fluid pipings 22a to 22c.
- the operation control means 51 includes a plurality of heat source units.
- Each of the heat source units 1a to 1c further includes outlet temperature sensors 17a to 17c for measuring the outlet temperature of the fluid flowing out from the heat medium side heat exchangers 8a to 8c, and the operation control means 51 includes the second heat source unit 1b. , 1c, the frequency of the compressor 3 of the second heat source units 1b, 1c is adjusted so that the outlet temperature Two measured at 1c approaches the set target temperature.
- the end timing of the defrosting operation may be controlled by the freezing determination for each of the plurality of heat source units 1a to 1c as in the first embodiment.
- the load side device is an air conditioner
- a floor heating system or a hot water supply system may be used.
- a storage tank is provided between the heat source system and the load side equipment, and the water heat medium is circulated between the heat source system and the storage tank and between the storage tank and the load side equipment. May be.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Computer Hardware Design (AREA)
- Air Conditioning Control Device (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
(熱源システム100の構成)
図1は、本発明の実施の形態1に係る熱源システムの暖房運転時の概略構成図である。図2は、本発明の実施の形態1に係る熱源システムの除霜運転時の概略構成図である。図1及び図2に基づいて、以下に熱源システム100の構成について説明する。
(Configuration of heat source system 100)
FIG. 1 is a schematic configuration diagram of the heat source system according to
水熱媒を加熱する暖房運転において、空気側熱交換器5に着霜が検知されると、制御装置50は、冷媒回路2の冷媒の流れを切り替えて、付着した霜を冷媒の熱により融解する。空気側熱交換器5の着霜検出は、例えば、温度センサを空気側熱交換器5に設けて冷媒温度を測定し、測定された温度が、予め設定された閾値温度以下となった場合に着霜を検出する。空気側熱交換器5の除霜運転では、図2に示すように、空気側熱交換器5は凝縮器になり、熱媒体側熱交換器8は蒸発器になる。したがって、熱媒体側熱交換器8には低温の冷媒が流入するため、水熱媒は熱媒体側熱交換器8において冷却される。 (Operation of
In the heating operation for heating the water heating medium, when frost formation is detected in the air-
図3は、本発明の実施の形態1に係る制御装置の機能ブロック図である。図3に基づき、制御装置50について説明する。制御装置50は、運転制御手段51と温度判定手段52と凍結判定手段53と記憶手段54とを備えている。 (Function of control device 50)
FIG. 3 is a functional block diagram of the control apparatus according to
図4は、本発明の実施の形態1に係る流体流量制御のフローチャートを示したものである。除霜運転中には、冷媒は冷房運転と同じ方向に流れるため、入口温度Twiに対して出口温度Twoが低下する。そのため、除霜運転中には、熱源システム100の供給水温の低下、及び熱媒体側熱交換器8の凍結等が懸念される。これに対して、図4の流体流量制御では、流体ポンプ20の駆動周波数を変化させて水流量FRを変化させている。冷媒回路2の冷却能力は、水流量FRと、入口温度Twi及び出口温度Twoの差との積によって規定される。したがって、冷却能力及び入口温度Twiが一定である場合には、水流量FRが多い方が、水流量FRが低い方と比較して出口温度Twoの低下は抑制される。 (Pump control during defrosting)
FIG. 4 shows a flowchart of fluid flow control according to the first embodiment of the present invention. During the defrosting operation, the refrigerant flows in the same direction as the cooling operation, so the outlet temperature Two decreases with respect to the inlet temperature Twi. Therefore, during the defrosting operation, there is a concern about a decrease in the supply water temperature of the
ところで、水量の増加は出口温度Twoの低下抑制に加えて、熱媒体側熱交換器8の凍結抑制にも効果がある。図5は、入口温度と凍結する蒸発温度との関係を示すグラフである。入口温度Twiが高いと凍結する蒸発温度は低下し、一方、入口温度Twiが低いと凍結する蒸発温度は上昇する。例えば、水流量FRと、冷媒回路2の冷却能力としての蒸発温度Teとが一定の場合、水熱媒の入口温度Twiが低いと、その分、出口温度Twoも低くなるため凍結し易い状態となる。 (Freeze evaporation temperature Tf)
By the way, the increase in the amount of water is effective in suppressing freezing of the heat medium
実施の形態2では、熱源システム100は、実施の形態1の熱源ユニット1と同一構成の熱源ユニット1a~1cを複数台備えている。複数の熱源ユニット1a~1cは、流体配管22a~22cが熱媒体側熱交換器8a~8cの上流側及び下流側で互いに合流するよう並列接続されている。貯湯タンクから熱源システム100に供給された水熱媒は、上流側の合流点で各熱源ユニット1a~1cに分岐して流れ、各熱媒体側熱交換器8a~8cで加熱又は冷却された後に下流側の合流点で再び合流し、熱源システム100から送出されて貯湯タンクに戻る。以下、暖房運転中の熱源システム100において、複数の熱源ユニット1a~1cのうち、熱源ユニット1aは除霜運転中であり、残りの熱源ユニット1b,1cは除霜運転を行っていない場合について説明する。
In the second embodiment, the
実施の形態2では、制御装置50は、除霜運転中の熱源ユニット1aにおいて入口温度Twiが所定の温度より高い場合には、熱源ユニット1aの流体ポンプ20aが熱媒体側熱交換器8aに供給する水流量FRaを少なくする。これより、冷却された熱媒体の送水量が抑えられ、貯湯タンクに送出される水温の低下を抑制している。複数の熱源ユニット1a~1cで構成される熱源システム100では、除霜中でない熱源ユニット1b,1cが温水を供給することができるため、単体の熱源ユニットで構成された熱源システムの場合よりも低い温度まで、除霜中の熱源ユニット1aの水流量FRaを低下させることができる。 (Pump control during defrosting)
In
Claims (8)
- 流体の加熱及び冷却を行う熱源ユニットと前記熱源ユニットを制御する制御装置とを備える熱源システムにおいて、
前記熱源ユニットは、
圧縮機と冷媒流路切替装置と空気側熱交換器と減圧装置と熱媒体側熱交換器とが冷媒配管を介して接続された冷媒回路と、
前記熱媒体側熱交換器により前記冷媒回路の冷媒と熱交換される前記流体が流れる流体配管と、
前記流体配管に設けられ、前記流体を前記熱媒体側熱交換器に供給する流体ポンプと、
前記熱媒体側熱交換器に流入する前記流体の温度を測定する入口温度センサと、を備え、
前記制御装置は、
前記空気側熱交換器が凝縮器になり前記熱媒体側熱交換器が蒸発器になる除霜運転時に、前記熱媒体側熱交換器に供給される前記流体の流量が前記入口温度センサにより測定された流体温度に応じて変化するように、前記流体ポンプを制御する運転制御手段を備える
熱源システム。 In a heat source system comprising a heat source unit that heats and cools a fluid, and a control device that controls the heat source unit,
The heat source unit is
A refrigerant circuit in which a compressor, a refrigerant flow switching device, an air side heat exchanger, a decompression device, and a heat medium side heat exchanger are connected via a refrigerant pipe;
A fluid pipe through which the fluid exchanged with the refrigerant in the refrigerant circuit flows by the heat medium side heat exchanger;
A fluid pump provided in the fluid piping and supplying the fluid to the heat medium side heat exchanger;
An inlet temperature sensor for measuring the temperature of the fluid flowing into the heat medium side heat exchanger,
The control device includes:
During the defrosting operation in which the air side heat exchanger becomes a condenser and the heat medium side heat exchanger becomes an evaporator, the flow rate of the fluid supplied to the heat medium side heat exchanger is measured by the inlet temperature sensor. A heat source system comprising operation control means for controlling the fluid pump so as to change in accordance with the measured fluid temperature. - 前記制御装置は更に、
前記除霜運転時に、前記測定された流体温度が第1設定温度より低いか否かを判定する温度判定手段を備え、
前記運転制御手段は、前記除霜運転時に、前記測定された流体温度が前記第1設定温度より低いと判定された場合に、前記供給される流体流量を通常流量より多くする請求項1記載の熱源システム。 The control device further includes:
A temperature determining means for determining whether or not the measured fluid temperature is lower than a first set temperature during the defrosting operation;
The said operation control means makes the said supplied fluid flow volume more than a normal flow volume, when it determines with the said measured fluid temperature being lower than the said 1st preset temperature at the time of the said defrost operation. Heat source system. - 前記熱源ユニットを複数備え、前記複数の熱源ユニットは前記流体配管が互いに並列接続されており、
前記運転制御手段は、
前記複数の熱源ユニットのうち第1熱源ユニットが除霜運転中であり第2熱源ユニットが除霜運転中でない場合であって、前記第1熱源ユニットの前記測定された流体温度が前記第1設定温度より高いと判定された場合に、前記第1熱源ユニットの前記供給される流体流量を通常流量より少なくし、前記第2熱源ユニットの前記供給される流体流量を通常流量より多くするものである請求項2記載の熱源システム。 A plurality of the heat source units are provided, and the plurality of heat source units have the fluid pipes connected in parallel to each other,
The operation control means includes
The first heat source unit among the plurality of heat source units is in the defrosting operation and the second heat source unit is not in the defrosting operation, and the measured fluid temperature of the first heat source unit is the first setting. When it is determined that the temperature is higher than the temperature, the supplied fluid flow rate of the first heat source unit is made smaller than the normal flow rate, and the supplied fluid flow rate of the second heat source unit is made larger than the normal flow rate. The heat source system according to claim 2. - 前記各熱源ユニットは更に、
前記熱媒体側熱交換器から流出する前記流体の出口温度を測定する出口温度センサを備え、
前記運転制御手段は、前記第2熱源ユニットにおいて前記測定された出口温度が設定された目標温度に近づくよう、前記第2熱源ユニットの前記圧縮機の周波数を調整する請求項3記載の熱源システム。 Each of the heat source units further includes
An outlet temperature sensor for measuring an outlet temperature of the fluid flowing out of the heat medium side heat exchanger;
The heat source system according to claim 3, wherein the operation control means adjusts the frequency of the compressor of the second heat source unit so that the measured outlet temperature approaches the set target temperature in the second heat source unit. - 前記各熱源ユニットは更に、
前記冷媒の蒸発温度を測定する蒸発温度センサを備え、
前記制御装置は更に、
前記除霜運転時に、前記供給される流体流量と前記測定された流体温度と前記測定された蒸発温度とに基づいて、前記熱媒体側熱交換器が凍結するか否かを判定する凍結判定手段を備え、
前記運転制御手段は、前記熱媒体側熱交換器が凍結しないと判定されているときには、前記除霜運転を継続する請求項1~4のいずれか一項記載の熱源システム。 Each of the heat source units further includes
An evaporation temperature sensor for measuring the evaporation temperature of the refrigerant;
The control device further includes:
Freezing determination means for determining whether or not the heat medium side heat exchanger is frozen based on the supplied fluid flow rate, the measured fluid temperature, and the measured evaporation temperature during the defrosting operation. With
The heat source system according to any one of claims 1 to 4, wherein the operation control means continues the defrosting operation when it is determined that the heat medium side heat exchanger does not freeze. - 前記制御装置は更に、
前記除霜運転時に、前記測定された流体温度が第2設定温度より低いか否かを判定する温度判定手段を備え、
前記凍結判定手段は、前記除霜運転時に、前記測定された流体温度が前記第2設定温度より低いと判定された場合に、前記熱媒体側熱交換器が凍結するか否かを判定する請求項5記載の熱源システム。 The control device further includes:
A temperature determining means for determining whether or not the measured fluid temperature is lower than a second set temperature during the defrosting operation;
The freezing determination means determines whether or not the heat medium side heat exchanger is frozen when it is determined that the measured fluid temperature is lower than the second set temperature during the defrosting operation. Item 6. The heat source system according to Item 5. - 前記凍結判定手段は、前記供給される流体流量及び前記測定された流体温度に応じた凍結蒸発温度を算出し、前記測定された蒸発温度が前記算出された凍結蒸発温度より低い場合には凍結すると判定し、前記測定された蒸発温度が前記算出された凍結蒸発温度より高い場合には凍結しないと判定する請求項5又は6記載の熱源システム。 The freezing determination means calculates a freeze evaporation temperature according to the supplied fluid flow rate and the measured fluid temperature, and freezes when the measured evaporation temperature is lower than the calculated freeze evaporation temperature. The heat source system according to claim 5 or 6, wherein the heat source system is determined and determined not to freeze when the measured evaporation temperature is higher than the calculated freeze evaporation temperature.
- 前記運転制御手段は、対応する前記流体ポンプの駆動周波数を調整して前記供給される流体流量を変化させるものであって、前記供給される流体流量を多くするときには前記流体ポンプの駆動周波数を大きくし、前記供給される流体流量を少なくするときには前記流体ポンプの駆動周波数を小さする請求項1~7のいずれか一項記載の熱源システム。 The operation control means adjusts the driving frequency of the corresponding fluid pump to change the supplied fluid flow rate, and increases the driving frequency of the fluid pump when increasing the supplied fluid flow rate. The heat source system according to any one of claims 1 to 7, wherein when the flow rate of the supplied fluid is reduced, the drive frequency of the fluid pump is decreased.
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