WO2015162798A1 - Heat pump chilling system and control method therefor - Google Patents
Heat pump chilling system and control method therefor Download PDFInfo
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- WO2015162798A1 WO2015162798A1 PCT/JP2014/061795 JP2014061795W WO2015162798A1 WO 2015162798 A1 WO2015162798 A1 WO 2015162798A1 JP 2014061795 W JP2014061795 W JP 2014061795W WO 2015162798 A1 WO2015162798 A1 WO 2015162798A1
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- heat pump
- pump chilling
- devices
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- calculated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/001—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems in which the air treatment in the central station takes place by means of a heat-pump or by means of a reversible cycle
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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
- F24D17/00—Domestic hot-water supply systems
- F24D17/02—Domestic hot-water supply systems using heat pumps
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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
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2203/00—Devices or apparatus used for air treatment
- F24F2203/02—System or Device comprising a heat pump as a subsystem, e.g. combined with humidification/dehumidification, heating, natural energy or with hybrid system
Definitions
- the present invention relates to a heat pump chilling system including a plurality of heat pump chilling devices and a control method thereof.
- a heat pump chilling system including a plurality of heat source devices such as a hot water supply system for supplying hot water or cold water has been known. And the operation
- Patent Document 1 in order to accurately perform the hot water filling amount of the bathtub using hot water supplied from a plurality of heat source machines (hot water heaters), first, a plurality of heat source machines are simultaneously started to perform pouring, A connected hot water supply system is disclosed in which only one heat source machine is operated immediately before reaching the target hot water filling amount in the middle of the hot water filling control, and the operation of some heat source machines is stopped.
- Patent Document 2 the time required for boiling and the number of operating units corresponding to the required amount of hot water are stored as a data table in advance, and the number of heat source units corresponding to the data table are sequentially started while being shifted by a predetermined time.
- a hot water system is disclosed.
- Patent Document 1 since all the heat source devices are activated at the time of activation, the operation capability of the plurality of heat source devices as a whole may be excessive.
- Patent Document 2 when a plurality of heat source devices are started while being shifted by a predetermined time, a hot water supply system having a large number of heat source devices takes time until the start is completed. Therefore, when returning from a power failure, a considerable amount of time is spent until the original heating or cooling ability is restored.
- the present invention has been made to solve the above-described problems, and can start up a plurality of heat pump chilling devices in a short time without excess or deficiency depending on the required capacity regardless of the number of heat pump chilling devices. It is an object of the present invention to provide a heat pump chilling system and a control method thereof.
- the heat pump chilling system of the present invention includes a heat pump in which a plurality of heat pump chilling devices having a refrigeration cycle through which a refrigerant flows are connected in parallel to a load, and a heat medium that exchanges heat with the refrigerant in the plurality of heat pump chilling devices circulates to the load.
- An chilling system that detects the temperature of a heat medium flowing from a load into a plurality of heat pump chilling devices as an inlet temperature, and detects the temperature of water flowing from the plurality of heat pump chilling devices into a load as an outlet temperature.
- System control device having an outlet temperature sensor, a system control device that controls operations of the plurality of heat pump chilling devices based on the inlet temperature detected by the inlet temperature sensor and the outlet temperature detected by the outlet temperature sensor
- the device is a multiple heat pump chilling device For each of a plurality of heat pump chilling devices stored in the storage unit, storage unit storing the operation capability, required capacity calculation means for calculating the required capacity based on the inlet temperature or outlet temperature and the set target temperature Number calculation means for calculating the number of activated heat pump chilling devices satisfying the required capacity calculated by the required capacity calculation means based on the operating capacity, and activation for starting the heat pump chilling apparatus for the number of activations calculated by the number calculation means And a control means.
- the number of required capacities is calculated and the heat pump chilling devices are activated simultaneously. As a result, the number of heat pump chilling devices can be started in a short time without any excess or deficiency.
- FIG. 1 It is a schematic diagram which shows the heat pump chilling system which concerns on Embodiment 1 of this invention. It is a block diagram which shows an example of the system control apparatus in the heat pump chilling system of FIG. It is a flowchart which shows the operation example of the heat pump chilling system of FIG. It is a figure which shows an example of the starting time in the heat pump chilling system of FIG.1 and FIG.2. It is a figure which shows an example of the starting time in the conventional heat pump chilling system. It is a block diagram which shows an example of the system control apparatus in the heat pump chilling system which concerns on Embodiment 2 of this invention. It is a flowchart which shows the operation example of the system control apparatus in the heat pump chilling system of FIG.
- FIG. 1 is a schematic diagram showing a heat pump chilling system according to Embodiment 1 of the present invention.
- a plurality of heat pump chilling devices 2A to 2E are connected in parallel to a load 3 using an inlet pipe 4 and an outlet pipe 5, and water or antifreeze liquid that mediates the exchange of heat energy. Or the like is circulated between the plurality of heat pump chilling devices 2A to 2E and the load 3.
- the load 3 is composed of, for example, a load-side heat exchanger, and air conditioning or hot water supply is performed using the load-side heat exchanger.
- the load 3 may consist of a hot water storage tank or a cold water tank, for example, and may consist of a thermal storage tank.
- the inlet pipe 4 branches from the load 3 to the plurality of heat pump chilling devices 2A to 2E and distributes the heat refrigerant.
- the portions of the inlet pipe 4 branched to the heat pump chilling devices 2A to 2E have pumps 6A. ⁇ 6E are attached.
- the outlet pipe 5 joins the heat medium exchanged in the plurality of heat pump chilling devices 2A to 2E and distributes it to the load 3 side.
- the pumps 6A to 6E are driven, the heat medium circulates between the heat pump chilling devices 2A to 2E and the load 3 via the inlet pipe 4 and the outlet pipe 5.
- the plurality of heat pump chilling devices 2A to 2E are composed of, for example, heat pump type heat source devices, and have the same configuration and the same operation capability, for example.
- Each of the heat pump chilling devices 2A to 2E includes a refrigeration cycle including a compressor 11, a heat source side heat exchanger 12, and a refrigerant pipe 13.
- the compressor 11 compresses the refrigerant to a high temperature and a high pressure.
- the heat source side heat exchanger 12 is composed of, for example, a plate heat exchanger, and performs heat exchange between the refrigerant flowing through the refrigeration cycle and the heat medium flowing in from the inlet pipe 4.
- the plurality of heat pump chilling devices 2A to 2E are respectively provided with a control device 14 for controlling the operation of each of the heat pump chilling devices 2A to 2E.
- the control devices 14 are connected to each other via a communication network 15 so that control information and the like can be transmitted.
- one representative machine for example, the heat pump chilling device 2A in FIG. 1
- the system controller 20 controls the operations of the heat pump chilling devices 2A to 2E via the communication network 15.
- the system control device 20 may be installed as an independent device from the heat pump chilling device 2A.
- the heat pump chilling system 1 includes an inlet temperature sensor 7 that detects the water temperature immediately before distribution to the plurality of heat pump chilling devices 2A to 2E in the inlet pipe 4 as the inlet temperature Ti, and a plurality of heat pump chilling devices 2A to 2 in the outlet pipe 5. And an outlet temperature sensor 8 for detecting the water temperature immediately after joining from 2E as the outlet temperature To.
- the inlet temperature sensor 7 detects the temperature of the heat medium flowing into the load 3 as the inlet temperature Ti
- the outlet temperature sensor 8 detects the temperature of the heat medium flowing out of the load 3 as the outlet temperature To. Is.
- the system control device 20 has a function of controlling the activation of the plurality of heat pump chilling devices 2A to 2E based on the inlet temperature Ti and the outlet temperature To.
- the system control device 20 activates one heat pump chilling device 2A among the plurality of heat pump chilling devices 2A to 2E at the start of operation, and if the required capability is insufficient after that, In order to compensate for this, control is performed so that a predetermined number of heat pump chilling devices 2B to 2E are simultaneously activated.
- the heat pump chilling device 2A which is a representative machine, is one unit that starts at the start of operation will be exemplified, but the other heat pump chilling devices 2B to 2E are selected as one unit that starts at the start of operation. May be.
- FIG. 2 is a block diagram showing an example of a system control apparatus in the heat pump chilling system of FIG. 1, and the system control apparatus 20 will be described with reference to FIGS.
- the system control device 20 controls the operation of the plurality of heat pump chilling devices 2A to 2E, and particularly has a function of controlling the activation of the plurality of heat pump chilling devices 2A to 2E.
- the system control device 20 includes a required capacity calculation unit 21, a target temperature setting unit 22, an operation capability calculation unit 23, a storage unit 24, a number calculation unit 25, and an activation control unit 26.
- the required capacity calculation means 21 calculates the required capacity Tdg based on the target temperature Tref and the inlet temperature Ti. Specifically, the required capacity calculation means 21 calculates the absolute value of the difference between the target temperature Tref and the inlet temperature Ti as the required capacity Tdg.
- the target temperature Tref is set by the target temperature setting means 22.
- the target temperature setting means 22 may acquire the target temperature Tref from information input means such as a keyboard or a touch panel, for example, or may store the target temperature Tref in advance.
- the operation capability calculation means 23 calculates an operation capability indicating the capability of heating or cooling the heat medium based on the inlet temperature Ti and the outlet temperature To for the plurality of heat pump chilling devices 2A to 2E, and stores it in the storage unit 24. Is. As described above, the plurality of heat pump chilling devices 2A to 2E have the same operation capability Td, and the heat pump chilling device 2A that is activated independently at the start of operation is activated. Therefore, the driving capability calculation means 23 calculates the driving capability Td of the heat pump chilling device 2A that is started up independently at the start of the operation, and uses the calculated driving capability Td of the heat pump chilling device 2A for the operation of the other heat pump chilling devices 2B to 2E.
- the operating capacity calculating means 23 calculates the absolute value
- Tdg / Td ceiling function ceiling
- the number of activated units n ⁇ 2 which is the output value of the ceiling function. Note that when the startup number n exceeds the total installed number N of the plurality of heat pump chilling devices 2A to 2E, the number calculation means 25 sets the total number as the startup number n.
- the starting control unit 26 controls (n ⁇ 1) heat pump chilling devices 2B to 2E to start simultaneously.
- the priority order of the heat pump chilling devices 2B to 2E to be activated in the activation control means 26 may be set in advance or may be determined randomly.
- the driving capability Td is not sufficient for the required capability Tdg, the driving capability Td of the entire system can be increased, and if the driving capability Td exceeds the required capability Tdg, the driving capability Td can be decreased. Then, when the driving capability Td is not sufficient for the required capability Tdg, the number calculation means 25 plans the next driving capability of the other heat pump chilling devices 2B to 2E, and the plan is determined. By the way, the start control means 26 instructs each control device 14 to start through the communication network 15.
- FIG. 3 is a flowchart showing an operation example at the time of start-up in the heat pump chilling system 1, and an operation example of the heat pump chilling system 1 will be described with reference to FIGS.
- any one of the heat pump chilling devices 2A to 2E (for example, the heat pump chilling device 2A) is activated with the maximum capacity under the control of the activation control means 26 (step ST1).
- the inlet temperature Ti detected by the inlet temperature sensor 7 and the outlet temperature To detected by the outlet temperature sensor 8 are acquired and stored in the storage unit 24. (Step ST2).
- the operating capacity calculating means 23 calculates the absolute value of the temperature difference given by one heat pump chilling device 2A as the operating capacity Td based on the inlet temperature Ti and the outlet temperature To. Then, the operation capability Td is stored in the storage unit 24 as the operation capability Td of the plurality of heat pump chilling devices 2A to 2E (step ST3).
- the temperature difference between the target temperature Tref and the inlet temperature Ti is calculated as the required capacity Tdg and stored in the storage unit 24 (step ST4).
- the order of the calculation of the driving ability Td (step ST3) and the calculation of the required ability Tdg (step ST4) is not limited and may be performed simultaneously.
- the driving capacity Td and the required capacity Tdg are read from the storage unit 24 in the number calculating means 25, and the starting number n of the heat pump chilling devices 2B to 2E to be started is calculated (step ST5).
- the start control means 26 the calculated number n of heat pump chilling devices 2B to 2E are simultaneously started (step ST6).
- the startup number n of the heat pump chilling devices 2B to 2E necessary for the required capacity is calculated and started at the same time, even in a system having a large number of heat pump chilling devices 2A to 2E.
- the heat pump chilling devices 2A to 2E can be activated in a short time within a certain period, and the number of activated heat pump chilling devices 2A to 2E can be activated without excess or deficiency with respect to the required capacity Tdg.
- FIG. 4 is a diagram illustrating an example of the start-up time in the heat pump chilling system of FIGS. 1 and 2.
- each heat pump chilling device 2A to 2E waits for the compressor 11 to protect the compressor 11.
- the activation starts after the activation protection time tw which is in a state (for example, about 5 minutes).
- the heat pump chilling devices 2A to 2E start operation after a time ts (for example, about 3 minutes) required for activation. Therefore, each of the heat pump chilling devices 2A to 2E requires time (tw + ts) from the start of operation to the start of operation.
- one heat pump chilling device 2A is activated independently at the start of operation, and thereafter, the other heat pump chilling devices 2B to 2E are simultaneously activated.
- the activation protection time tw proceeds simultaneously for all the heat pump chilling devices 2A to 2E. Therefore, the time required for the plurality of heat pump chilling devices 2A to 2E to start the operation for obtaining the required capacity Tdg is the time (tw + ts) from the start of the operation of the one heat pump chilling device 2A to the start of the operation (tw + ts).
- a fixed time (tw + 2ts) is obtained by adding the time tw from the second to the start of activation.
- FIG. 5 is a diagram showing an example of the start-up time in the conventional heat pump chilling system.
- the activation standby time td for waiting for activation in each of the heat pump chilling devices 2B to 2E (for example, about 2 to 3 minutes) is set.
- the time required for starting the first unit is (ts + tw).
- a time of ts + tw + (n ⁇ 1) ⁇ td is required.
- the larger the number of heat pump chilling devices 2A to 2E the more necessary for the activation of a system that satisfies the required capacity. Takes a long time.
- the plurality of heat pump chilling devices 2A to 2E satisfying the required capacity Tdg can be activated in a short time.
- the driving capacities Td of the plurality of heat pump chilling devices 2B to 2E when calculating the driving capacities Td of the plurality of heat pump chilling devices 2B to 2E from the driving capacities Td of one heat pump chilling device 2A that is started up independently at the start of operation, it is based on the driving capacities Td when actually operating. Since the startup number n can be calculated, the startup number n satisfying the required capacity Tdg can be calculated with high accuracy. That is, the place where the plurality of heat pump chilling devices 2A to 2E are installed and the load 3 to be connected are various. For this reason, when the operation capability Td of the heat pump chilling devices 2A to 2E is stored in the storage unit 24 as a fixed value at the time of shipment, the actual operation capability Td and the operation capability Td stored in the storage unit 24 are shifted.
- the installation location of the heat pump chilling devices 2A to 2E is determined, and the storage unit 24 stores the operation capacity Td after the load 3 connected to the heat pump chilling devices 2A to 2E is specified. It has become. Thereby, the driving ability Td corresponding to the load 3 can be calculated with high accuracy.
- FIG. FIG. 6 is a block diagram showing Embodiment 2 of the system control apparatus in the heat pump chilling system of the present invention.
- the system control apparatus 120 in the heat pump chilling system will be described with reference to FIG. Note that, in the system control device 120 of the second embodiment, parts having the same configuration as the system control device 20 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the difference between the system control device 120 of the second embodiment and the system control device 20 of the first embodiment is that a plurality of heat pump chilling devices 2A to 2E are started simultaneously from the start of operation.
- the storage unit 24 stores the driving ability Td for each of the plurality of heat pump chilling devices 2A to 2E.
- the driving ability Td stored in the storage unit 24 is, for example, stored when the heat pump chilling device 2A is activated alone, as in the first embodiment.
- the driving capability Td may be stored in the storage unit 24 at the time of shipment.
- the number-of-units calculation means 125 is activated simultaneously to obtain the required capacity Tdg calculated by the required capacity calculation means 21 based on the operation capacity of each of the plurality of heat pump chilling devices 2A to 2E stored in the storage unit 24. n is calculated using the ceiling function ceiling (Tdg / Td). At this time, since none of the plurality of heat pump chilling devices 2A to 2E is activated, the calculated activation number n is the number that is activated simultaneously as it is. Then, the start control unit 126 controls the heat pump chilling devices 2A to 2E for the start number n calculated by the number calculation unit 125 to start simultaneously.
- FIG. 7 is a flowchart showing an operation example of the system control apparatus in the heat pump chilling system of FIG. 6, and an operation example of the system control apparatus 120 will be described with reference to FIGS.
- the operation capability (temperature difference) Td of the plurality of heat pump chilling devices 2A to 2E stored in the storage unit 24 is read (step ST11).
- the inlet temperature Ti is acquired from the inlet temperature sensor 7 and stored in the storage unit 24 (step ST12).
- the required capacity Tdg is calculated from the target temperature Tref set by the target temperature setting means 22 and the acquired inlet temperature Ti, and stored in the storage unit 24 (step ST13).
- the number-of-units calculation means 125 calculates the number of activated units n to be activated simultaneously based on the operating capabilities Td and the required capabilities Tdg of the plurality of heat pump chilling devices 2A to 2E (step ST14).
- the activation control means 126 simultaneously activates the n heat pump chilling devices 2A to 2E (step ST15).
- the startup number n of the heat pump chilling devices 2A to 2E required for the required capability Tdg is calculated based on the operation capability Td for each of the plurality of heat pump chilling devices 2A to 2E stored in the storage unit 24.
- the number n of activation can be activated simultaneously. For this reason, even a heat pump chilling system having a large number of heat pump chilling devices 2A to 2E can be activated in a shorter period of time, and can be activated without excess or deficiency with respect to the required capacity Tdg, as in the first embodiment. can do.
- FIG. FIG. 8 is a block diagram showing a third embodiment of the system controller in the heat pump chilling system of the present invention.
- the system controller 220 in the heat pump chilling system will be described with reference to FIG. Note that, in the system control device 220 of the third embodiment, parts having the same configuration as the system control device 20 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the difference between the system control device 220 of the third embodiment and the system control device 20 of the first embodiment is that the driving capability calculation means 223 learns the driving capability of the heat pump chilling devices 2A to 2E and stores it in the storage unit 224. .
- the driving capability calculation means 223 in FIG. 8 calculates the driving capability Td of the heat pump chilling device 2A activated independently at the start of operation, and the optimized driving capability Tds by optimizing the result calculated for the number of learning times. Is stored in the storage unit 224. Specifically, a predetermined value for the number of learning times is set in advance in the driving ability calculation means 223. On the other hand, the storage unit 24 stores the number of learnings already performed for each of the heat pump chilling devices 2A to 2E. For example, when the learning frequency of the heat pump chilling device 2 ⁇ / b> A activated at the start of operation reaches a specified value, the driving capability calculation unit 223 is configured to optimize the driving capability stored in the storage unit 224. The startup number n is calculated based on Tds.
- the driving ability calculation means 223 optimizes the driving ability Tds stored in the storage unit 224 when the learning count has not reached the specified value.
- the driving capability calculation means 223 calculates the driving capability Td of the heat pump chilling device 2 ⁇ / b> A that is activated independently at the start of the operation, and stores it in the storage unit 24.
- the storage unit 224 stores the average value of the driving ability Td for the number of times of learning.
- the storage unit 224 performs optimization by calculating the average value taking into account the newly calculated driving ability Td, and is stored in the storage unit 224. Update the optimized driving capability Tds.
- the activation control unit 226 controls to activate simultaneously the number n of activations that satisfy the required capability Tdg at the start of activation, as in the second embodiment.
- the activation control means 226 activates a single heat pump chilling device 2A at the start of operation so that the learning of the driving ability Td is performed when the number of learning times is equal to or less than the specified value, and then the required ability Tdg.
- the number (n ⁇ 1) of heat pump chilling devices 2B to 2E satisfying the control are controlled so as to be activated simultaneously.
- FIG. 9 is a flowchart showing an operation example of the system control apparatus in the heat pump chilling system of FIG. 8, and an operation example of the system control apparatus 220 will be described with reference to FIGS.
- the number of learning times is read from the storage unit 224 in the driving ability calculating means 223 (step ST21), and it is determined whether or not the read number of learnings satisfies the set specified value (step ST22). If the number of learning is equal to or greater than the specified value, it is determined that learning has already been completed, and the optimized driving capability Tds stored in the storage unit 224 is used as the driving capability Td of the heat pump chilling devices 2A to 2E ( Step ST23). Thereafter, the inlet temperature sensor 7 detects the inlet temperature Ti (step ST24).
- step ST25 if the number of learning is less than the prescribed value, a new learning number obtained by adding 1 to the learning number is stored again in the storage unit 24 (step ST25). Then, one heat pump chilling device 2A is activated with the maximum operation capacity by the activation control means 226 (step ST26).
- the inlet temperature sensor 7 detects the inlet temperature Ti (step ST27). Thereafter, the absolute value of the temperature difference between the inlet temperature Ti and the outlet temperature To is calculated as the driving capability Td, and the average value of the driving capability Td for the number of learning times is stored in the storage unit 224 as the optimized driving capability Tds ( Step ST28).
- the required capacity Tdg is calculated by the required capacity calculation means 21 (step ST29), and the number of activated vehicles n is calculated using the optimized driving capacity Tds by the number calculation means 225 (step ST30). Then, it is determined in the activation control means 226 whether or not one heat pump chilling device 2A has already been activated alone (step ST31). In other words, it is determined whether or not learning of the driving ability Tds has been performed.
- step ST32 When one heat pump chilling device 2A has already been activated alone (when the driving ability Tds has been learned), (n ⁇ 1) heat pump chilling devices 2B to 2E are activated (step ST32). On the other hand, when one heat pump chilling device 2A is not activated independently (when the number of learning is equal to or greater than a specified value), n heat pump chilling devices 2A to 2E are activated simultaneously (step ST33).
- the operation capability (temperature difference) Td at the maximum operation capability of one heat pump chilling device 2A is learned and stored in the storage unit 24, after completing the learning, It is possible to start up with the shortest startup time. Further, since the optimized driving capability Tds is stored in the storage unit 24, the number n of startups can be accurately calculated with little difference from the actual driving capability Td. Further, similarly to the first embodiment, the heat pump chilling devices 2A to 2E with the number n of activations that are not excessive or deficient with respect to the required capacity Tdg can be activated.
- FIG. FIG. 10 is a block diagram showing Embodiment 4 of the system control apparatus in the heat pump chilling system of the present invention.
- the system control apparatus 320 in the heat pump chilling system will be described with reference to FIG.
- the system control device 320 of the fourth embodiment parts having the same configuration as the system control device 20 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the difference between the system control device 320 of the fourth embodiment and the system control device 20 of the first embodiment is that the startup numbers ns and nf are calculated in consideration of the energy efficiency of the heat pump chilling devices 2A to 2E.
- the number calculating means 325 calculates the number of activated units ns in consideration of the capacity ratio A. Specifically, the number calculation means 325 uses the ceiling function ceiling (Tdg / (Td ⁇ A)) to start all the heat pump chilling devices 2A to 2E to be started at the capacity ratio A. Is calculated.
- the capacity ratio A at which the energy efficiency of the heat pump chilling devices 2A to 2E is best is often between 60% and 90%.
- the number calculation means 325 operates the heat pump chilling devices 2A to 2 that operate at the maximum operating capacity (capacity ratio 100%) so as to satisfy the required capacity Tdg.
- a combination of the number of startups nf of 2E and the number of startups ns of the heat pump chilling devices 2A to 2E operating at a preset capacity ratio A is calculated.
- FIG. 11 is a flowchart showing an operation example of the heat pump chilling system of FIG.
- one heat pump chilling device 2A is activated with a maximum capacity of 100% (step ST41).
- the inlet temperature Ti and the outlet temperature To immediately after the start of one heat pump chilling device 2A is detected and stored in the storage unit 24 (step ST42).
- the operation capability Td of one heat pump chilling device 2A is stored in the storage unit 24, and the other heat pump chilling devices 2B to 2E are also assumed to have the operation capability Td. (Step ST43).
- the required capacity (target temperature difference) Tdg is calculated by the required capacity calculation means 21 based on the target temperature Tref and the inlet temperature Ti set by the target temperature setting means 22 and stored in the storage unit 24 (step ST44). ).
- the number calculation means 325 calculates the number of activation ns when all the heat pump chilling devices 2A to 2E are activated at the capacity ratio A so as to obtain the necessary capacity (step ST45). Thereafter, the number calculation means 325 determines whether or not the number n of startups at the calculated capacity ratio A is larger than the total number N of installed units (step ST46).
- step ST47 When the activation number ns is equal to or less than the total installation number N, (n ⁇ 1) heat pump chilling devices 2B to 2E, which are subtracted from one already activated, are activated at the capacity ratio A (step ST47).
- the number of activated units ns at the capacity ratio A exceeds the total installed number N (ns> N)
- the number of startups nf is calculated (step ST48), and the number of startups ns to be started at the capacity ratio A is recalculated (step ST49).
- startup has already been completed under the control of the startup control means 26.
- the heat pump chilling devices 2B to 2E except for one (nf-1) are activated at the maximum capacity, and the ns heat pump chilling devices 2B to 2E are activated at the capacity ratio A (step ST49).
- the heat pump chilling system by controlling the activation of the plurality of heat pump chilling devices 2A to 2E in consideration of energy efficiency, the heat pump chilling system as a whole can be activated in an energy efficient operation state. Furthermore, as in the first embodiment, the heat pump chilling devices 2A to 2E with the number n of startups that are not excessive or insufficient with respect to the required capacity Tdg can be started up in a short time.
- FIG. 11 the case where one heat pump chilling device 2A is activated independently at the start of operation is illustrated.
- the heat pump chilling devices 2A to 2E corresponding to the required capacity Tdg are activated simultaneously. Even if it is a case where it does, you may calculate the starting number n in consideration of the capability ratio A mentioned above. Further, the required capacity stored in the storage unit 24 may be optimized as in the third embodiment.
- the required capacity calculation means 21 exemplifies a case where the absolute value of the difference between the target temperature Tref and the inlet temperature Ti is calculated as the required capacity as the required capacity Tdg, but the difference between the target temperature Tref and the outlet temperature To May be calculated as the required capacity Tdg.
- the required capacity Tdg is a positive value, it is insufficient, and if it is a negative value, it is required. It means that the capability Tdg is satisfied. Therefore, the number calculating means 25 only needs to calculate the number satisfying the shortage required capacity Tdg.
- the inlet temperature Ti and the outlet temperature To have the same value, so the same operation as that of the second embodiment described above is performed.
- FIG. 6 and FIG. 7 exemplify the case where the same driving ability Td is stored in the storage unit 24 for the plurality of heat pump chilling devices 2A to 2E, but has different driving ability Td. Also good.
- the number-of-units calculation means 25 may determine the number of activated units n so that the combination of the heat pump chilling devices 2A to 2E satisfying the required capacity.
- the activation control unit 26 activates and learns the heat pump chilling device 2A is illustrated, but among the plurality of heat pump chilling devices 2A to 2E, the activation control unit 26 is activated independently at the start of operation at random.
- a heat pump chilling device may be set.
- each heat pump chilling device 2A to 2E may be activated independently, and each driving capability Td may be calculated and stored in the storage unit 24.
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Abstract
Description
以下、図面を参照しながら本発明のヒートポンプチリングシステムについて詳細に説明する。図1は本発明の実施形態1に係るヒートポンプチリングシステムを示す模式図である。図1のヒートポンプチリングシステム1は、複数のヒートポンプチリング装置2A~2Eが負荷3に入口配管4及び出口配管5を用いて並列に接続されており、熱エネルギーを交換するのに媒介させる水や不凍液などの熱媒体が複数のヒートポンプチリング装置2A~2Eと負荷3との間に循環するものである。負荷3は例えば負荷側熱交換器からなっており、負荷側熱交換器を用いて空調もしくは給湯等が行われるようになっている。なお、負荷3が負荷側熱交換器からなる場合について例示しているが、例えば貯湯タンクもしくは冷水タンクからなっていてもよいし、蓄熱タンクからなっていてもよい。
Hereinafter, the heat pump chilling system of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a heat pump chilling system according to
図6は本発明のヒートポンプチリングシステムにおけるシステム制御装置の実施形態2を示すブロック図であり、図6を参照してヒートポンプチリングシステムにおけるシステム制御装置120について説明する。なお、実施形態2のシステム制御装置120において、実施形態1のシステム制御装置20と同一の構成を有する部位には同一の符号を付してその説明を省略する。実施形態2のシステム制御装置120が実施形態1のシステム制御装置20と異なる点は、運転開始時から複数のヒートポンプチリング装置2A~2Eを同時に起動する点である。
FIG. 6 is a block
図8は本発明のヒートポンプチリングシステムにおけるシステム制御装置の実施形態3を示すブロック図であり、図8を参照してヒートポンプチリングシステムにおけるシステム制御装置220について説明する。なお、実施形態3のシステム制御装置220において、実施形態1のシステム制御装置20と同一の構成を有する部位には同一の符号を付してその説明を省略する。実施形態3のシステム制御装置220が実施形態1のシステム制御装置20と異なる点は、運転能力算出手段223がヒートポンプチリング装置2A~2Eの運転能力を学習して記憶部224に記憶する点である。
FIG. 8 is a block diagram showing a third embodiment of the system controller in the heat pump chilling system of the present invention. The
図10は本発明のヒートポンプチリングシステムにおけるシステム制御装置の実施形態4を示すブロック図であり、図10を参照してヒートポンプチリングシステムにおけるシステム制御装置320について説明する。なお、実施形態4のシステム制御装置320において、実施形態1のシステム制御装置20と同一の構成を有する部位には同一の符号を付してその説明を省略する。実施形態4のシステム制御装置320が実施形態1のシステム制御装置20と異なる点は、各ヒートポンプチリング装置2A~2Eのエネルギー効率を考慮して起動台数ns、nfを算出する点である。
FIG. 10 is a block
Claims (12)
- 冷媒が流れる冷凍サイクルを備えた複数のヒートポンプチリング装置が負荷に並列的に接続され、前記複数のヒートポンプチリング装置において前記冷媒と熱交換された熱媒体が前記負荷へ循環するヒートポンプチリングシステムであって、
前記負荷から前記複数のヒートポンプチリング装置へ流入する熱媒体の温度を入口温度として検知する入口温度センサと、
前記複数のヒートポンプチリング装置から前記負荷へ流入する水の温度を出口温度として検知する出口温度センサと、
前記入口温度センサにおいて検知された前記入口温度と、前記出口温度センサにおいて検知された出口温度とに基づいて、前記複数のヒートポンプチリング装置の動作を制御するシステム制御装置と
を有し、
前記システム制御装置は、
前記複数のヒートポンプチリング装置毎の運転能力を記憶した記憶部と、
前記入口温度又は前記出口温度と設定された目標温度とに基づいて、要求能力を算出する要求能力算出手段と、
前記記憶部に記憶された前記複数のヒートポンプチリング装置毎の運転能力に基づいて、前記要求能力算出手段により算出された要求能力を満たす前記ヒートポンプチリング装置の起動台数を算出する台数算出手段と、
前記台数算出手段において算出された起動台数分の前記ヒートポンプチリング装置を起動させる起動制御手段と
を備えたヒートポンプチリングシステム。 A heat pump chilling system in which a plurality of heat pump chilling devices including a refrigeration cycle through which a refrigerant flows is connected in parallel to a load, and in which the heat medium exchanged with the refrigerant in the plurality of heat pump chilling devices circulates to the load. ,
An inlet temperature sensor that detects the temperature of the heat medium flowing from the load into the plurality of heat pump chilling devices as an inlet temperature;
An outlet temperature sensor that detects a temperature of water flowing into the load from the plurality of heat pump chilling devices as an outlet temperature;
A system controller that controls operations of the plurality of heat pump chilling devices based on the inlet temperature detected by the inlet temperature sensor and the outlet temperature detected by the outlet temperature sensor;
The system controller is
A storage unit that stores driving capability for each of the plurality of heat pump chilling devices;
A required capacity calculating means for calculating a required capacity based on the inlet temperature or the outlet temperature and the set target temperature;
Based on the operation capacity of each of the plurality of heat pump chilling devices stored in the storage unit, the number calculating means for calculating the number of activated heat pump chilling devices that satisfy the required capacity calculated by the required capacity calculating means,
A heat pump chilling system comprising start control means for starting up the heat pump chilling devices corresponding to the number of starts calculated by the number calculating means. - 前記起動制御手段は、運転開始時に前記台数算出手段において算出された台数の前記ヒートポンプチリング装置を同時に起動させる請求項1に記載のヒートポンプチリングシステム。 The heat pump chilling system according to claim 1, wherein the activation control unit simultaneously activates the number of the heat pump chilling devices calculated by the number calculation unit at the start of operation.
- 前記複数のヒートポンプチリング装置は、同一の運転能力を有しており、
前記起動制御手段は、運転開始時に1台の前記ヒートポンプチリング装置を単独で起動させるものであり、
1台の前記ヒートポンプチリング装置が起動した後の前記入口温度及び前記出口温度に基づいて、起動している1台の前記ヒートポンプチリング装置の運転能力を算出し、算出した運転能力を前記複数のヒートポンプチリング装置の運転能力として前記記憶部に記憶する運転能力算出手段をさらに備えた請求項1に記載のヒートポンプチリングシステム。 The plurality of heat pump chilling devices have the same operation capability,
The activation control means is to activate one heat pump chilling device alone at the start of operation,
Based on the inlet temperature and the outlet temperature after the one heat pump chilling device is activated, the operation capability of the one activated heat pump chilling device is calculated, and the calculated operation capability is calculated as the plurality of heat pumps. The heat pump chilling system according to claim 1, further comprising an operation capability calculation unit that stores the operation capability of the chilling device in the storage unit. - 前記起動制御手段は、1台の前記ヒートポンプチリング装置の起動後に、前記要求能力算出手段により算出された要求能力に応じた台数の前記ヒートポンプチリング装置を同時に起動させるものである請求項3に記載のヒートポンプチリングシステム。 The said starting control means starts the said heat pump chilling apparatus of the number according to the required capacity | capacitance calculated by the said required capacity | capacitance calculating means simultaneously after starting of the said one heat pump chilling apparatus. Heat pump chilling system.
- 前記起動制御手段は、1台の前記ヒートポンプチリング装置を最大運転能力で起動させるものである請求項3又は4に記載のヒートポンプチリングシステム。 The heat pump chilling system according to claim 3 or 4, wherein the start control means starts one heat pump chilling device with a maximum operating capacity.
- 前記運転能力算出手段は、前記入口温度と前記出口温度との差分を前記ヒートポンプチリング装置の運転能力として算出するものである請求項3~5のいずれか1項に記載のヒートポンプチリングシステム。 The heat pump chilling system according to any one of claims 3 to 5, wherein the operation capacity calculation means calculates a difference between the inlet temperature and the outlet temperature as an operation capacity of the heat pump chilling device.
- 前記運転能力算出手段は、1台の前記ヒートポンプチリング装置の起動が複数回行われた毎に算出された複数の前記運転能力に基づいて、前記記憶部に記憶された前記運転能力の最適化を行うものである請求項3~6のいずれか1項に記載のヒートポンプチリングシステム。 The driving capacity calculation means optimizes the driving capacity stored in the storage unit based on the plurality of driving capacities calculated each time the heat pump chilling device is activated a plurality of times. The heat pump chilling system according to any one of claims 3 to 6, wherein the heat pump chilling system is performed.
- 前記記憶部には、前記記憶部に記憶された前記運転能力の最適化が行われた回数を学習回数として記憶するものであり、
前記運転能力算出手段は、前記学習回数が予め設定された規定回数以下である場合、前記運転能力の最適化を行うものである請求項7のいずれか1項に記載のヒートポンプチリングシステム。 In the storage unit, the number of times that the driving ability stored in the storage unit is optimized is stored as a learning number.
8. The heat pump chilling system according to claim 7, wherein the driving ability calculating unit optimizes the driving ability when the number of times of learning is equal to or less than a predetermined number of times set in advance. - 前記起動制御手段は、前記学習回数が予め設定された規定回数以下である場合、運転開始時に1台の前記ヒートポンプチリング装置を単独で起動させた後、前記台数算出手段において最適化された前記運転能力に基づいて算出された起動台数の前記ヒートポンプチリング装置を起動させるものであり、
前記学習回数が予め設定された規定回数よりも大きい場合、運転開始時に前記台数算出手段において最適化された前記運転能力に基づいて算出された起動台数の前記ヒートポンプチリング装置を起動させるものである請求項8に記載のヒートポンプチリングシステム。 When the learning control number is equal to or less than a predetermined number of times set in advance, the start control unit starts the heat pump chilling device alone at the start of operation, and then optimizes the operation in the number calculation unit Starting the heat pump chilling device of the number of startup calculated based on the capability,
When the learning number is larger than a predetermined number of times set in advance, the number of the activated heat pump chilling devices calculated based on the driving ability optimized by the number calculating means at the start of operation is started. Item 9. The heat pump chilling system according to Item 8. - 前記台数算出手段は、前記複数のヒートポンプチリング装置が最大運転能力よりも低い予め設定された能力割合で運転した場合の起動台数を算出するものである請求項1~9のいずれか1項に記載のヒートポンプチリングシステム。 10. The number-of-units calculation means calculates the number of units to be started when the plurality of heat pump chilling devices are operated at a preset capacity ratio lower than the maximum operation capacity. Heat pump chilling system.
- 前記台数算出手段は、能力割合で運転した場合の起動台数が前記複数のヒートポンプチリング装置の総設置台数よりも大きくなった場合、前記要求能力を満たすように、最大運転能力で運転する前記ヒートポンプチリング装置の台数と予め設定された能力割合で運転する前記ヒートポンプチリング装置の起動台数との組み合わせを算出するものである請求項10に記載のヒートポンプチリングシステム。 The number calculating means is configured to operate the heat pump chilling that operates at a maximum operating capacity so as to satisfy the required capacity when the number of activated units when operating at a capacity ratio becomes larger than the total number of installed heat pump chilling devices. The heat pump chilling system according to claim 10, wherein a combination of the number of devices and the number of activated heat pump chilling devices operating at a preset capacity ratio is calculated.
- 冷媒が流れる冷凍サイクルを備えた複数のヒートポンプチリング装置と負荷とが熱媒体が循環するように並列的に接続され、前記複数のヒートポンプチリング装置が冷媒と熱媒体との間で熱交換を行うヒートポンプチリングシステムの制御方法であって、
前記負荷から前記複数のヒートポンプチリング装置へ流入する入口温度と、前記複数のヒートポンプチリング装置から前記負荷へ流入する出口温度と設定された目標温度とに基づいて、要求能力を算出し、
算出した要求能力が得られる前記ヒートポンプチリング装置の起動台数を記憶部に記憶された前記複数のヒートポンプチリング装置毎の運転能力に基づいて算出し、
算出した起動台数分の前記ヒートポンプチリング装置を起動させる
ヒートポンプチリングシステムの制御方法。 A heat pump in which a plurality of heat pump chilling devices having a refrigeration cycle through which a refrigerant flows and a load are connected in parallel so that the heat medium circulates, and the plurality of heat pump chilling devices exchange heat between the refrigerant and the heat medium A control method for a chilling system,
Based on the inlet temperature flowing into the plurality of heat pump chilling devices from the load, the outlet temperature flowing into the load from the plurality of heat pump chilling devices, and the set target temperature, the required capacity is calculated,
Calculate the number of startup of the heat pump chilling device that can obtain the calculated required capacity based on the operating capacity of each of the plurality of heat pump chilling devices stored in the storage unit,
A control method of a heat pump chilling system that activates the heat pump chilling devices for the calculated number of activated vehicles.
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CN113864973A (en) * | 2021-09-23 | 2021-12-31 | 珠海格力电器股份有限公司 | Control method, device and system for clustered heat pump unit and air conditioning equipment |
CN115900134A (en) * | 2022-11-16 | 2023-04-04 | 珠海格力电器股份有限公司 | Multi-heat-pump module unit and anti-freezing control method thereof |
CN115900134B (en) * | 2022-11-16 | 2024-06-04 | 珠海格力电器股份有限公司 | Multi-heat pump module unit and anti-freezing control method thereof |
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JPWO2015162798A1 (en) | 2017-04-13 |
EP3136013A4 (en) | 2017-12-27 |
JP6261724B2 (en) | 2018-01-17 |
EP3136013B1 (en) | 2023-02-22 |
EP3136013A1 (en) | 2017-03-01 |
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