WO2020148887A1 - チリングユニットおよび冷温水システム - Google Patents
チリングユニットおよび冷温水システム Download PDFInfo
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- WO2020148887A1 WO2020148887A1 PCT/JP2019/001460 JP2019001460W WO2020148887A1 WO 2020148887 A1 WO2020148887 A1 WO 2020148887A1 JP 2019001460 W JP2019001460 W JP 2019001460W WO 2020148887 A1 WO2020148887 A1 WO 2020148887A1
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- Prior art keywords
- flow rate
- heat medium
- pump
- drive frequency
- heat
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
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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
- 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
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/06—Several compression cycles arranged in parallel
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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
- 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
Definitions
- the present invention relates to a chilling unit and a cold/hot water system.
- it relates to a pump for circulating a heat medium in a heat medium circulation circuit such as water.
- a cold/hot water system In buildings such as office buildings, air conditioning such as heating or cooling is performed in the target space such as a room.
- a cold/hot water system has been proposed in which the load side device heats or cools the target space by driving the pump to provide cold/hot water supplied from a chilling unit having a cold/hot heat source device through a water circulation circuit.
- the cold/hot heat source device uses a refrigeration cycle to generate cold water or hot water in a water heat exchanger that exchanges heat between a refrigerant and water.
- Patent Document 1 proposes a method of adjusting the drive frequency of the pump based on the load to improve COP (coefficient of performance: Coefficient Of Performance). Therefore, in the water circulation circuit, the pump is driven based on the temperature due to the load, but no particular consideration is given to the state of the water, such as the flow rate of water flowing through the water circulation circuit. Therefore, there is a possibility that the water passing through the water heat exchanger will be excessive or deficient depending on the condition of the piping in the water circulation circuit at the site.
- COP coefficient of performance: Coefficient Of Performance
- an object of the present invention is to obtain a chilling unit and a cold/hot water system capable of stably circulating water in a water circulation circuit.
- a chilling unit is a chilling unit that heats or cools a heat medium that is a medium that conveys heat to circulate in a heat medium circulation circuit to supply heat to a heat load.
- a heat source side device that has a pump that applies pressure to the heat medium and a heat medium heat exchanger that heats or cools the heat medium, and an upper limit flow rate and a lower limit setting of the heat medium that passes through the heat medium heat exchanger.
- a control device that sets at least one of an upper limit drive frequency and a lower limit drive frequency of the pump based on at least one of the flow rates.
- the cold/hot water system includes a plurality of chilling units described above, a load side device for supplying heat to a heat load by heat exchange with a heat medium, and a plurality of chilling units connected in parallel.
- a water header header for supplying the heated or cooled heat medium from the chilling unit to the load side device and a plurality of chilling units are connected in parallel, and multiple heat mediums from the load side device are connected. Is connected to the return water side header pipe to be distributed to the chilling unit to form a heat medium circulation circuit.
- the control device sets the upper limit drive frequency and the lower limit of the pump based on at least one of the upper limit set flow rate and the lower limit set flow rate of the heat medium passing through the heat medium heat exchanger. At least one of the driving frequencies is set. Therefore, it is possible to prevent the occurrence of freezing and the like due to the shortage of the heat medium, and to stably circulate the heat medium in the heat medium circulation circuit without passing more heat medium than necessary and deteriorating the efficiency. A chilling unit and a hot and cold water system can be obtained.
- FIG. 1 is a diagram showing the configuration of a cold/hot water system 1000 according to Embodiment 1 of the present invention.
- the configuration and the like of the cold/hot water system 1000 will be described based on FIG. 1.
- the cold/hot water system 1000 is a system for supplying heat to a target heat load by a heat medium cooled or heated in a chilling unit 100 which is a heat source side device.
- the heat medium serving as a medium for transferring heat is, for example, brine (antifreeze liquid), water, a mixed liquid of brine and water, a mixed liquid of an additive having a high anticorrosive effect and water, and the like.
- water is used as the heat medium.
- the hot/cold water system 1000 has a chilling unit 100, a forward water side header pipe 200, a return water side header pipe 300, a bypass pipe 400, a bypass valve 410, a load side device 500, a two-way valve 600 and a tank 700, and a heat medium.
- a water circulation circuit 900 serving as a circulation circuit is configured.
- the chilling unit 100 heats or cools the water circulating in the water circulation circuit 900.
- the cold/hot water system 1000 according to the first embodiment includes a plurality of chilling units 100, and the cold/hot water system 1000 in FIG. 1 includes three chilling units 100A to 100C. The configuration of the chilling unit 100 will be described later.
- the incoming water side header pipe 200 joins the water sent from each chilling unit 100 and distributes it to each load side device 500.
- the return water side header pipe 300 merges the water sent from each load side device 500, and distributes it to each chilling unit 100.
- the bypass pipe 400 is a pipe that connects the outgoing water side header pipe 200 and the returning water side header pipe 300.
- the bypass pipe 400 bypasses the water that is not sent to the load side device 500 side from the going water side header pipe 200 and sends it to the return water side header pipe 300.
- the bypass valve 410 regulates the flow rate of water passing through the bypass pipe 400.
- the load-side device 500 is a device that has a load-side heat exchanger 510 and that heats or cools the target load.
- the load side device 500 is a device such as a fan coil unit or an air handling unit, for example.
- FIG. 1 there are three load side devices 500A to 500C.
- the load-side heat exchanger 510 of the load-side device 500 exchanges heat between the passing water and the target load.
- the two-way valve 600 is a valve that controls passage or non-passage of water to the load side heat exchanger 510 of the load side device 500.
- the tank 700 stores water and supplies it when there is not enough water circulating in the water circulation circuit 900.
- the tank 700 is, for example, an open tank, a cushion tank, or a closed tank.
- FIG. 2 is a diagram showing a configuration of the chilling unit 100 of the cold/hot water system 1000 according to Embodiment 1 of the present invention.
- the chilling unit 100 according to the first embodiment includes a refrigeration cycle device 60 that constitutes a refrigerant circuit that circulates a refrigerant, and uses a refrigeration cycle to perform an operation of cooling or heating water that is a heat medium that transfers heat.
- the cold/hot water system 1000 of Embodiment 1 air-conditions the target space by the heat carried by the water. Therefore, the heating operation of the chilling unit 100 will be described as a heating operation, and the cooling operation will be described as a cooling operation.
- the chilling unit 100 has a refrigeration cycle device 60.
- the refrigeration cycle apparatus 60 connects the compressor 10, the four-way valve 20, the air heat exchanger 30, the expansion valve 40, and the water heat exchanger 50 by piping to form a refrigerant circuit.
- the chilling unit 100 also has a pump 70 installed on the side of the water circulation circuit 900.
- the chilling unit 100 has a control device 110 that controls components and the like, a storage rod 120, and an input device 130.
- the compressor 10 compresses the drawn refrigerant and discharges it.
- the compressor 10 has a compressor inverter drive device 11, for example.
- the compressor inverter drive device 11 arbitrarily changes the drive frequency of the compressor 10 based on an instruction from the control device 110, so that the capacity of the compressor 10 becomes the amount of refrigerant discharged per unit time. Can be changed.
- the four-way valve 20 serving as a flow path switching device switches the flow of the refrigerant according to the operation to be executed based on the instruction from the control device 110. For example, during the cooling operation, the four-way valve 20 allows the refrigerant to flow such that the high-temperature and high-pressure refrigerant discharged from the compressor 10 flows into the air heat exchanger 30. Further, during the heating operation, the four-way valve 20 allows the high-temperature and high-pressure refrigerant discharged from the compressor 10 to flow into the water heat exchanger 50.
- the air heat exchanger 30 has a plurality of heat transfer tubes and exchanges heat between the refrigerant passing through the heat transfer tubes and air (for example, outside air).
- the air heat exchanger 30 functions as an evaporator in the heating operation, performs heat exchange between the low-pressure refrigerant and the air flowing in from the expansion valve 40 side, and evaporates and evaporates the refrigerant. Further, in the cooling operation, it functions as a condenser, performs heat exchange between the low-pressure refrigerant flowing from the compressor 10 side and air, and condenses and liquefies the refrigerant. Further, the fan 31 sends air to the air heat exchanger 30 to promote heat exchange between the refrigerant and air.
- the water heat exchanger 50 serving as a heat medium heat exchanger performs heat exchange between the water serving as a heat medium and the refrigerant.
- the water heat exchanger 50 functions, for example, as a condenser during heating operation, performs heat exchange between the refrigerant flowing from the compressor 10 side and water, and condenses the refrigerant to liquefy or gas-liquid two-phase. , Heat the water.
- it functions as an evaporator, exchanging heat between the refrigerant flowing from the expansion valve 40 side and water, evaporating the refrigerant to vaporize it, and cools the water.
- the expansion valve 40 serving as a throttle device adjusts the pressure of the refrigerant in the water heat exchanger 50 by changing the opening degree, for example.
- the expansion valve 40 may be a temperature-sensitive expansion valve or the like that changes the opening based on the temperature of the refrigerant, but in the first embodiment, the electronic that changes the opening based on an instruction from the control device 110. Comprised of a type expansion valve.
- the pump 70 sucks the water in the water circulation circuit 900, applies pressure to it, and sends it out to circulate it. Further, the pump inverter drive device 71 can change the capacity of the pump 70 by arbitrarily changing the drive frequency based on an instruction from the control device 110.
- the chilling unit 100 includes an inflow side water temperature detecting device 150 and an outflow side water temperature detecting device 160 which are heat medium temperature detecting devices for detecting the temperature of water flowing in and out of the water heat exchanger 50. .. Further, the chilling unit 100 has an inflow side water pressure detection device 170 and an outflow side water pressure detection device 180, which serve as a heat medium pressure detection device, for detecting the pressure of water flowing in and out of the water heat exchanger 50.
- the control device 110 controls the chilling unit 100.
- the control device 110 of the present embodiment has at least an operation control device 111 and a pump flow rate determination device 112.
- the operation control device 111 controls the operation of the entire chilling unit 100.
- the pump flow rate determination device 112 according to the first embodiment performs a process of determining the upper limit drive frequency and the lower limit drive frequency of the pump 70, particularly in a trial operation including a case where the cooling operation and the heating operation are switched and performed. ..
- the storage device 120 temporarily or long-term stores various data necessary for the control device 110 to perform processing.
- the data obtained by the processing performed by the control device 110 is also temporarily or long-term stored.
- the input device 130 sends a signal related to an instruction from the operator to the control device 110.
- the operation control device 111 and the pump flow rate determination device 112 of the control device 110 can be configured with different hardware, for example.
- an arithmetic control processing device such as a computer having a CPU (Central Processing Unit)
- the processing procedure thereof may be programmed in advance and configured by software or firmware.
- the arithmetic control unit executes the program, performs the process based on the program, and realizes the process performed by each of the above devices.
- the data of these programs may be stored in the storage device 120, for example.
- the storage device 120 is a volatile storage device (not shown) such as a random access memory (RAM) capable of temporarily storing data, a hard disk, and a non-volatile auxiliary storage such as a flash memory capable of storing data for a long time. It has a device (not shown).
- RAM random access memory
- non-volatile auxiliary storage such as a flash memory capable of storing data for a long time. It has a device (not shown).
- the controller 110 of the chilling unit 100 performs an automatic test operation of the cold/hot water system 1000 at the installation location of the cold/hot water system 1000.
- the control device 110 determines and sets the drive frequency of the pump 70 corresponding to the upper and lower limits of the flow rate of water from the upper and lower limits of the flow rate of water passing through the set water heat exchanger 50.
- the pump 70 drives within the range of the set driving frequency to allow stable passage of water in the water heat exchanger 50.
- FIG. 3 is a diagram illustrating a procedure for determining a drive frequency of the pump 70 in a test operation of the cold/hot water system 1000 according to the first embodiment of the present invention.
- the control device 110 sets the upper limit and the lower limit of the drive frequency for the pump 70 included in each chilling unit 100. Based on FIG. 3, a processing procedure performed by the control device 110 in the trial operation of the cold/hot water system 1000 performed at the installation site will be described.
- the operator inputs settings for the upper limit flow rate and the lower limit flow rate of water passing through the water heat exchanger 50 when the pump 70 is driven via the input device 130.
- the control device 110 sets the upper limit set flow rate and the lower limit set flow rate as data based on the signal from the input device 130 (step S1).
- the upper limit set flow rate and the lower limit set flow rate are, in particular, the upper limit and the lower limit of the flow rate of water passing through the water heat exchanger 50 in each chilling unit 100.
- control device 110 determines whether or not the automatic test operation mode is set (step S2). When determining that the automatic test operation mode is not set, the control device 110 determines that the manual test operation mode is set, and performs the test operation based on an instruction from the operator (step S4).
- control device 110 determines that the automatic test operation mode is set, it drives the pump 70 to start water circulation in the water circulation circuit 900 (step S3).
- the control device 110 operates the pump inverter drive device 71 to increase the drive frequency of the pump 70 by a predetermined setting, and the difference between the inflow side water pressure detection device 170 and the outflow side water pressure detection device 180. Is calculated, and the flow rate of water is calculated (step S5). Then, control device 110 determines whether the calculated flow rate of water is equal to or higher than the upper limit set flow rate (step S6).
- step S6 the control device 110 determines that the calculated water flow rate is not higher than or equal to the upper limit set flow rate.
- the process returns to step S5, the pump inverter drive device 71 is operated, and the drive frequency of the pump 70 is increased to drive the pump 70. Continue until it is determined that the above.
- the control device 110 determines the drive frequency of the pump 70 at the time of determination as the upper limit drive frequency, and stores it in the storage device 120 as data. (Step S7).
- control device 110 operates the pump inverter drive device 71 to lower the drive frequency of the pump 70 by a predetermined setting, and the inflow side water pressure detection device 170 and the outflow side water pressure detection device 180. And the flow rate of water is calculated (step S8). Then, the control device 110 determines whether or not the calculated water flow rate is equal to or lower than the lower limit set flow rate (step S9). When the control device 110 determines that the calculated water flow rate is not less than or equal to the lower limit set flow rate, the process returns to step S8, the pump inverter drive device 71 is operated, and the drive frequency of the pump 70 is reduced to drive the lower limit set flow rate. Continue until the following is determined.
- step S9 When it is determined in step S9 that the calculated water flow rate is equal to or lower than the lower limit set flow rate, the control device 110 determines the drive frequency of the pump 70 at the time of determination as the lower limit drive frequency, and stores it in the storage device 120 as data. (Step S10). Then, the operation in the automatic test operation mode is ended (step S11).
- control device 110 controls the drive of the pump 70, and the upper limit drive frequency of the pump 70 corresponding to the upper limit set flow rate and the lower limit set flow rate. And the lower limit drive frequency is determined.
- control device 110 may determine at least one of the upper limit drive frequency and the lower limit drive frequency of pump 70 based on at least one of the upper limit set flow rate and the lower limit set flow rate.
- the lower limit drive frequency of the pump 70 it is possible to flow water at a lower limit set flow rate or more in the water heat exchanger 50, suppress insufficient flow rate of the water heat exchanger 50, and drive the pump 70 with energy saving. can do. Further, by setting the drive frequency of the pump 70 to be equal to or higher than the lower limit drive frequency, it is possible to prevent partial freezing of the water heat exchanger 50 caused by a decrease in the flow rate of water due to a transient change, and prevent damage to the water heat exchanger 50. You can
- the control device 110 of the chilling unit 100 performs the automatic test operation of the cold/hot water system 1000 at the installation site. Therefore, it is possible to reduce the work load such as the setting of the operator, reduce mistakes due to human error, and reduce the construction cost.
- Embodiment 2 the process of determining the upper limit drive frequency and the lower limit drive frequency of the pump 70 performed by the control device 110 in the test operation has been described.
- stains such as erosion, corrosion and impurities are generated on the equipment and piping in the water circulation circuit 900.
- resistance to water in the water circulation circuit 900 increases. Therefore, the relationship between the drive frequency of the pump 70 and the flow rate of water in the water circulation circuit 900 may be different from the relationship obtained in the test run. For example, if the flow rate of water is low with respect to the drive frequency of the pump 70, water may freeze in the water heat exchanger 50.
- FIG. 4 is a diagram illustrating a procedure for adjusting the drive frequency of the pump 70 during normal operation of the cold/hot water system 1000 according to the second embodiment of the present invention. Based on FIG. 4, a processing procedure relating to automatic adjustment of the drive frequency of the pump 70 performed by the control device 110 will be described.
- the control device 110 determines whether or not the automatic adjustment mode is set (step S21). When the control device 110 determines that the automatic adjustment mode is not set, it performs the manual mode in which the upper limit drive frequency and the lower limit drive frequency are adjusted based on the operator's instruction (step S22).
- control device 110 determines whether or not the calculated water flow rate is equal to or higher than the upper limit set flow rate (step S24).
- control device 110 controls the pump inverter drive device 71 to drive the pump 70 by lowering the drive frequency by a preset amount (step). S25). Then, the control device 110 resets the upper limit drive frequency of the pump 70 that does not exceed the upper limit set flow rate, and stores it in the storage device 120 as data (step S26).
- control device 110 determines whether the calculated water flow rate is equal to or lower than the lower limit set flow rate (step S27).
- the control device 110 controls the pump inverter drive device 71 to drive the pump 70 by increasing the drive frequency by a preset amount (step). S28).
- the control device 110 resets the lower limit drive frequency of the pump 70 which does not become less than or equal to the lower limit set flow rate, and stores it in the storage device 120 as data (step S29).
- control device 110 periodically repeats the above processing at regular time intervals (step S30).
- the length of the fixed time is not particularly limited, but is, for example, one week or one month.
- the control device 110 performs the automatic adjustment process of adjusting the upper limit drive frequency and the lower limit drive frequency of the pump 70 in the automatic adjustment mode. Therefore, it is possible to adjust the deviation of the relationship between the drive frequency of the pump 70 and the flow rate of water in the water circulation circuit 900 due to dirt such as erosion, corrosion and impurities generated in the equipment and piping in the water circulation circuit 900. Therefore, the pump 70 can be controlled within the range of not more than the upper limit set flow rate and not less than the lower limit set flow rate, and the water heat exchanger 50 can pass water without excess or deficiency.
- Embodiment 3 In the chilling unit 100 of the first embodiment described above, the control device 110 has been described as setting the upper limit set flow rate and the lower limit set flow rate in the water circulation circuit 900 as data based on the signal from the input device 130 during the test operation. .. In the third embodiment, the case where the upper limit set flow rate and the lower limit set flow rate can be set based on the intended use of the cold/hot water system 1000 will be described.
- the operation of the cold/hot water system 1000 is often decided, such as the amount of heat required, depending on the application for which it is installed. Therefore, in the chilling unit 100 according to the third embodiment, data relating to the settings of the refrigeration cycle device 60, the pump 70, and the like for a plurality of predetermined uses are stored in the storage device 120. Then, it is possible to select the optimum local system mode for performing the processing using the data. Then, when the operation in the optimum on-site system mode is selected during the test operation, the control device 110 further sets the upper limit of the pump 70 stored in the storage device 120 for the selected use application among the plurality of use applications. Perform processing based on the set flow rate and lower limit set flow rate data.
- FIG. 5 is a diagram illustrating a procedure for determining a drive frequency of the pump 70 in a test operation of the cold/hot water system 1000 according to the third embodiment of the present invention.
- control device 110 performs processing in the same procedure as described in the first embodiment.
- step S0 The operator selects and inputs via the input device 130 whether or not to make settings in the optimum local system mode.
- the controller 110 determines that the optimum local system mode is selected, the controller 110 further sets the upper limit set flow rate data and the lower limit set flow rate data in the water circulation circuit 900 based on the usage purpose selected from a plurality of usage purpose menus. Yes (step S0A).
- the control device 110 determines that the optimum local system mode is not selected, the control device 110 sets the upper limit set flow rate and the lower limit set flow rate in the water circulation circuit 900 as data based on the signal from the input device 130 (step S1).
- the cold/hot water system 1000 of the third embodiment by setting the data of the upper limit set flow rate and the lower limit set flow rate set in advance for each intended use, it does not depend on the skill level of the operator. It is possible to easily set an appropriate flow rate.
- FIG. 6 is a diagram showing the configuration of a cold/hot water system 1000 according to Embodiment 4 of the present invention.
- the cold/hot water system 1000 of the single pump system has been described, but the present invention is not limited to this. It is also applicable to the cold/hot water system 1000 of the double pump system shown in FIG.
- devices and the like denoted by the same reference numerals as in FIG. 1 and the like are the same as those described in the cold/hot water system 1000 of the first embodiment.
- the going water side header pipe 200 is divided into a plurality of going water side header pipes 200A, going water side header pipes 200B, and going water side header pipes 200C.
- the return water side header pipe 300 is divided into a plurality of return water side header pipes 300A and a return water side header pipe 300B.
- the secondary pump 800A and the secondary pump 800B pressurize the water sent from the chilling unit 100 side and send it to the load side device 500.
- the secondary pump 800A and the secondary pump 800B are pumps driven with a constant capacity.
- the differential pressure valve 810 is a valve that adjusts the flow rate of water sent to the load-side device 500.
- control device 110 determines the upper limit drive frequency and the lower limit drive frequency of the pump 70 in the trial run and the automatic adjustment process thereafter. It can be performed.
- FIG. 7 is a figure which shows the structure of the chilling unit 100 of the cold/hot water system 1000 which concerns on Embodiment 5 of this invention.
- the first embodiment described above has a configuration having one refrigerant circuit.
- the chilling unit 100 according to the fifth embodiment has a plurality of refrigeration cycle devices 60 and has a configuration in which a plurality of refrigerant circuits are connected in parallel to a water circulation circuit 900.
- two refrigeration cycle devices 60A and 60B are connected in parallel to the water circulation circuit 900.
- the chilling unit 100 has a refrigeration cycle device 60A and a refrigeration cycle device 60B.
- the refrigeration cycle device 60A has a compressor 10A, a compressor inverter drive device 11A, a four-way valve 20A, an air heat exchanger 30A, an expansion valve 40A, and a water heat exchanger 50A, and constitutes a refrigerant circuit.
- the refrigeration cycle device 60A has a fan 31A.
- the refrigeration cycle device 60B has a compressor 10B, a compressor inverter drive device 11A, a four-way valve 20B, an air heat exchanger 30B, an expansion valve 40B, and a water heat exchanger 50B, and constitutes a refrigerant circuit.
- the refrigeration cycle device 60B has a fan 31B. The operation of each device is the same as the operation performed by the device having the same reference numeral without the subscript described in the first embodiment.
- the chilling unit 100 includes an inflow side water temperature detection device 150 and an inflow side water pressure detection device 170 at positions where the temperature and pressure of the water flowing into the water heat exchanger 50A are detected. Further, an outflow-side water temperature detection device 160 and an outflow-side water pressure detection device 180 are provided at positions where the temperature and pressure of the water flowing out from the water heat exchanger 50B are detected. Therefore, with respect to both the water heat exchanger 50A and the water heat exchanger 50B, the upper limit drive frequency and the lower limit drive frequency of the pump 70 are set so that water is allowed to pass within a range of the lower limit set flow rate or more and the upper limit set flow rate or less. be able to.
- the upper limit drive frequency and the lower limit drive frequency of the pump 70 can be set even in the chilling unit 100 in which a plurality of refrigeration cycle devices 60 are connected in parallel.
- the chilling unit 100 has been described as having the pump 70, but the present invention is not limited to this.
- the cold/hot water system 1000 may be a device independent of the chilling unit 100.
- the refrigeration cycle device 60 included in the chilling unit 100 has been described as heating or cooling the water in the water circulation circuit 900, but the present invention is not limited to this. Absent. Other heating devices or cooling devices may be used as the heat source side device.
- the refrigeration cycle device 60 has the four-way valve 20, and the water heat exchanger 50 is described as being capable of heating or cooling water.
- the present invention is not limited to this.
- the chilling unit 100 dedicated to heating or cooling may be used.
- the processing relating to the automatic adjustment of the drive frequency of the pump 70 performed by the control device 110 described in the second embodiment can be applied. it can.
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Abstract
Description
図1は、この発明の実施の形態1に係る冷温水システム1000の構成を示す図である。図1に基づいて、冷温水システム1000の構成などについて説明する。冷温水システム1000は、熱源側装置となるチリングユニット100において冷却または加熱された熱媒体により、対象となる熱負荷に熱供給を行うシステムである。熱を搬送する媒体となる熱媒体は、たとえば、ブライン(不凍液)、水、ブラインと水との混合液、防食効果が高い添加剤と水との混合液などである。ここでは、水を熱媒体として用いるものとする。冷温水システム1000は、チリングユニット100、往き水側ヘッダ管200、還り水側ヘッダ管300、バイパス管400、バイパス弁410、負荷側装置500、二方弁600およびタンク700を有し、熱媒体循環回路となる水循環回路900を構成する。
実施の形態1においては、試運転において、制御装置110が行うポンプ70の上限駆動周波数および下限駆動周波数を決定する処理について説明した。たとえば、チリングユニット100を連続運転すると、水循環回路900内の機器および配管などに、エロージョン、コロージョンおよび不純物などの汚れが発生する。発生した汚れが配管に付くと、水循環回路900において水に対する抵抗が大きくなる。このため、水循環回路900におけるポンプ70の駆動周波数と水の流量との関係が、試運転において得られた関係と異なる場合がある。たとえば、ポンプ70の駆動周波数に対して水の流量が少ないと、水熱交換器50内において水の凍結などが生じる可能性がある。
前述した実施の形態1のチリングユニット100において、制御装置110は、試運転のとき、入力装置130からの信号に基づき、水循環回路900における上限設定流量および下限設定流量をデータとして設定するものとして説明した。実施の形態3においては、冷温水システム1000の使用用途に基づく上限設定流量および下限設定流量の設定を行うことができる場合について説明する。
図6は、この発明の実施の形態4に係る冷温水システム1000の構成を示す図である。前述した実施の形態1においては、単式ポンプシステムの冷温水システム1000について説明したが、これに限定するものではない。図6に示す複式ポンプシステムの冷温水システム1000についても適用することができる。図6において、図1などと同じ符号を付している機器などについては、実施の形態1の冷温水システム1000において説明したことと同様である。ここで、往き水側ヘッダ管200は、複数の往き水側ヘッダ管200A、往き水側ヘッダ管200Bおよび往き水側ヘッダ管200Cに分かれている。また、還り水側ヘッダ管300は、複数の還り水側ヘッダ管300Aおよび還り水側ヘッダ管300Bに分かれている。
図7は、この発明の実施の形態5に係る冷温水システム1000のチリングユニット100の構成を示す図である。前述した実施の形態1においては、1つの冷媒回路を有する構成であった。実施の形態5のチリングユニット100は、複数の冷凍サイクル装置60を有し、水循環回路900に対して、複数の冷媒回路を並列に接続する構成である。図6では、水循環回路900に対して、2つの冷凍サイクル装置60Aおよび冷凍サイクル装置60Bを並列に接続している。
前述した実施の形態1~実施の形態5においては、チリングユニット100がポンプ70を有するものとして説明したが、これに限定するものではない。冷温水システム1000において、チリングユニット100とは独立した装置としてもよい。
Claims (7)
- 熱を搬送する媒体となる熱媒体を加熱または冷却して熱媒体循環回路を循環させ、熱負荷に熱供給を行うチリングユニットであって、
ポンプ用インバータ駆動装置を有し、前記熱媒体に圧力を加えるポンプと、
熱媒体熱交換器を有し、前記熱媒体を加熱または冷却する熱源側装置と、
前記熱媒体熱交換器を通過する前記熱媒体の上限設定流量および下限設定流量の少なくとも一方に基づいて、前記ポンプの上限駆動周波数および下限駆動周波数の少なくとも一方を設定する制御装置と
を備えるチリングユニット。 - 前記熱源側装置は、圧縮機、空気熱交換器、膨張弁および前記熱媒体熱交換器が配管接続され、冷媒が循環する冷媒回路を有する冷凍サイクル装置である請求項1に記載のチリングユニット。
- 前記熱媒体熱交換器に流入出する圧力を検出する熱媒体圧力検出装置を備え、
前記制御装置は、
前記熱媒体圧力検出装置の検出に係る圧力から算出した前記熱媒体熱交換器に流れる前記熱媒体の流量から、前記上限駆動周波数および前記下限駆動周波数を設定する請求項1または請求項2に記載のチリングユニット。 - 前記制御装置は、前記熱媒体循環回路における試運転のときに、前記ポンプの駆動周波数を上げて前記熱媒体循環回路に前記熱媒体を循環させ、前記上限設定流量以上となったときの前記ポンプの前記駆動周波数を、前記上限駆動周波数とし、前記ポンプの前記駆動周波数を下げて前記熱媒体循環回路に前記熱媒体を循環させ、前記下限設定流量以下となったときの前記ポンプの前記駆動周波数を、前記下限駆動周波数として設定する処理を自動で行う請求項1~請求項3のいずれか一項に記載のチリングユニット。
- 前記制御装置は、前記熱媒体循環回路における運転中、前記熱媒体熱交換器を通過する前記熱媒体の流量が前記上限設定流量より多いと判定すると、前記ポンプの駆動周波数を下げて、前記上限設定流量以下となったと判定したときの前記ポンプの前記駆動周波数を、前記上限駆動周波数と再設定し、前記熱媒体熱交換器を通過する前記熱媒体の流量が前記下限設定流量より少ないと判定すると、前記ポンプの前記駆動周波数を上げて、前記下限設定流量以下となったと判定したときの前記ポンプの前記駆動周波数を、前記下限駆動周波数と再設定する処理を、一定時間毎に定期的に行う請求項1~請求項4のいずれか一項に記載のチリングユニット。
- ユニットの使用用途別の前記上限設定流量および前記下限設定流量のデータを記憶する記憶装置を備え、
前記制御装置は、選択に係る前記使用用途の前記上限設定流量および前記下限設定流量に基づいて、前記ポンプの前記上限駆動周波数および前記下限駆動周波数を設定する請求項1~請求項5のいずれか一項に記載のチリングユニット。 - 請求項1~請求項6のいずれか一項に記載の複数台のチリングユニットと、
熱媒体との熱交換により、熱負荷に熱供給を行う負荷側装置と、
複数台の前記チリングユニットが並列に接続され、前記チリングユニットからの加熱または冷却された前記熱媒体を合流させて前記負荷側装置に供給する往き水側ヘッダ管と、
複数台の前記チリングユニットが並列に接続され、前記負荷側装置からの前記熱媒体を複数台の前記チリングユニットに分配する還り水側ヘッダ管と
を接続して熱媒体循環回路を構成する冷温水システム。
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