JP4707562B2 - Connected chiller / heater and its operation method - Google Patents

Description

  The present invention relates to a connected chiller / heater including a plurality of commercial-power-driven chiller / heater units and inverter-driven chiller / heater units connected to a common chilled water pipe via a header, and an operation method thereof.

  A connected chiller / heater system, in which multiple chiller / heater units are connected to a common chilled water pipe via a header, can control the number of units in response to fluctuations in load capacity, and can be operated efficiently. It is. As the chiller / heater used in the plurality of chiller / heaters constituting the coupled chiller / heater in this way, there are a commercial power supply-driven chiller / heater and an inverter-driven chiller / heater. The commercial power supply driven chiller / heater is a chiller / heater operated by supplying electric power of frequency 60 Hz (or 50 Hz) from the commercial power supply to the drive motor, and controlling the capacity by controlling the slide valve. An inverter-driven chiller / heater is operated by supplying power from a commercial power supply to the drive motor through the inverter while changing its voltage / frequency, and capacity control is performed by voltage / frequency control by the inverter. is there.

  As shown by a curve A in FIG. 4, the commercial power supply chiller / heater has a characteristic that the efficiency (COP) is good at the maximum load (100% load) but the efficiency is poor at the partial load. On the other hand, since the inverter-driven chiller / heater is controlled by voltage / frequency control of the drive power supplied to the motor, as shown by the curve B in FIG. Although it is less efficient than (curve A), it has a characteristic that efficiency is good at partial load. In addition, the inverter-driven chiller / heater has an initial cost that is higher than that of a commercial power supply-driven chiller / heater because the inverter is provided.

If all of the multiple chiller / heater units that make up the connected chiller / heater unit are commercial power-driven chiller / heater units, the initial cost is low, but there is a problem that efficient operation is not possible in the unit operation, and the running cost is reduced accordingly. Get higher. Further, if all of the plurality of chiller / heater units are inverter-driven chiller / heater units, the number of units can be efficiently operated and the running cost can be reduced, but the initial cost is increased.
JP 2004-144457 A

  The present invention has been made in view of the above-described points, and the chiller / heater of the connected chiller / heater is composed of at least one commercial power supply-driven chiller / heater and at least one inverter-driven chiller / warmer. An object of the present invention is to provide a connected chiller / heater that can be operated at high efficiency (COP) according to the load, and an operation method thereof, while reducing the initial cost of the chiller / cooler.

In order to solve the above-mentioned problem, the invention described in claim 1 is characterized in that at least one commercial power source is driven by supplying commercial power from a commercial power source connected to a common cold water pipe to a drive motor without frequency conversion. This is an operation method of a connected chiller / heater equipped with a chiller / heater and at least one inverter-driven chiller / heater that converts the frequency of commercial power from a commercial power source through an inverter and supplies the drive power to the drive motor. In the freezing operation, each chilled water heater controls each chilled water outlet temperature to a predetermined constant temperature , and is optimally operated every fixed time according to the number of connected chilled water heaters, the chilled water inlet / outlet set temperature difference, and the chilled water inlet temperature. Calculate the number of units, and by comparing the optimal number of operating units with the number of operating units, if the actual number of operating chilled water heaters is greater than a predetermined value than the optimal number of operating units, decrease the number of operating chilled water heaters by one, In fact If the number of operating chilled water heaters is less than a predetermined value below the optimum operating number, the number of chilled water heaters is increased by one and the chilled water heaters are operated so that the number of operating chilled water heaters is the optimum operating number. When the number of operating units increases, the inverter-driven chiller / heater is operated with priority, and when the number of operating units decreases, the commercial power source-driven chiller / heater is prioritized and stopped, and the chilled water outlet temperature setting temperature of the chiller / heater In comparison with the inverter-driven chiller / heater, the commercial-power-driven chiller / heater reduces the set temperature of the chilled water by a constant value or gives a load signal to the compressor to increase the load. It is characterized by.

  In addition, the cold / hot water machine here does not indicate only a device that can be used for both freezing and hot water, but also includes a simple refrigerator that has only a function of taking out cold water and is not intended to take out hot water.

According to a second aspect of the present invention, there is provided at least one commercial power source driven chiller / heater for supplying commercial power from a commercial power source connected to a common hot water pipe to a drive motor without frequency conversion, A method for operating a connected chiller / heater comprising at least one inverter-driven chiller / heater that converts commercial power from a power source through an inverter and supplies it to a drive motor for driving. The machine controls the temperature of each hot water outlet to a predetermined constant temperature during hot water operation, calculates the optimum number of units to be operated at regular intervals based on the number of connected cold water heaters, the temperature difference between the hot water inlet and outlet, and the hot water inlet temperature. By comparing the optimum number of operating units with the number of operating units, if the actual number of operating chilled water heaters is larger than the optimum operating number by a predetermined value or more, the number of operating chilled water heaters is decreased by one, and the actual chilled water heaters Cab Is operated as number of operating said chiller by the chiller is increased one smaller than a predetermined value than the optimum number of operating units is the optimum number of operating units, during operation number increases in the chiller is The inverter-driven chiller / heater is operated with priority, and when the number of operating units decreases, the commercial power supply-driven chiller / heater is prioritized and stopped, and the hot water outlet set temperature of the chiller / heater can be cascade-controlled, the commercial power supply driven chiller compared to the inverter driver cold water heater, characterized in that as the hot water set temperature put a lot of load giving load signal to or compressor raises certain value.

The invention according to claim 3 is a connected chiller / heater in which a plurality of chiller / heaters are connected to a common chilled water pipe, and the plurality of chiller / heaters is frequency-converted from commercial power from a commercial power source. at least one of the commercial power source driving Dohiya water heater is supplied to the drive motor for driving without, at least one of the commercial power supply to the drive motor and frequency conversion through the inverter drive from the commercial power source and an inverter driving Dohiya water heater, said at each chiller refrigeration operation, controls the coolant outlet temperature of each predetermined constant temperature, connection speed of the cold temperature water machine, cold water inlet and outlet set temperature difference, the cold water inlet temperature If the actual number of chilled water heaters is greater than the optimum number of units by comparison between the optimum number of units and the number of units operated, the operation of the chilled water heaters is calculated. Decrease the number of units, As the number of operating units of the chiller number of operating said chiller is smaller than a predetermined value the number of operating the chiller is increased one than the optimum number of operating time becomes the optimum number of operating e Bei operation control means for operating, the operation control means, when the number of operating units increase in the chiller heater is operated with priority the inverter drive chiller, when the number of operating units reduced the commercial power supply chiller The chilled water outlet temperature of the plurality of chilled water heaters can be cascade controlled, and the commercial power supply chilled water heater lowers the chilled water temperature by a certain value compared to the inverter driven chiller water heater. Alternatively , it is characterized in that a load signal is given to the compressor to increase the load .

The invention according to claim 4 is a connected chiller / heater in which a plurality of chiller / heaters are connected to a common chilled water pipe, and the plurality of chiller / heaters is frequency-converted from commercial power from a commercial power source. At least one commercial power supply driven chiller / heater that is supplied to the drive motor without driving, and at least one inverter that converts the commercial power from the commercial power supply through the inverter and supplies it to the drive motor for driving Each of the hot and cold water heaters controls each hot water outlet temperature to a predetermined constant temperature during the hot water operation, and is controlled at a certain time depending on the number of connected hot water heaters, the hot water inlet / outlet temperature difference, and the hot water inlet temperature. If the actual number of operating chilled water heaters is greater than the optimum number of operating units by comparing the optimal number of operating units with the number of operating units, the number of operating chilled water heaters is one. Reduced and actual If the number of operating chilled water heaters is smaller than the optimum operating number below a predetermined value, the number of operating chilled water heaters is increased by 1 so that the number of operating chilled water heaters becomes the optimum operating number. The operation control means prioritizes the inverter-driven chiller / heater when the number of chilled water heaters increases, and prioritizes the commercial power supply chiller / heater when the number of operators decreases. The hot water outlet set temperature of the plurality of cold water heaters can be cascade-controlled, and the commercial power source driven cold water heater can lower the hot water set temperature by a certain value compared to the inverter driven cold water heater Alternatively, it is characterized in that it is provided with a function of applying a load by giving a load signal to the compressor.

According to the invention described in claim 1, each chiller during freezing operation, controls the coolant outlet temperature of each predetermined constant temperature, coupling number chiller, chilled water inlet and outlet set temperature difference, the cold water inlet temperature By calculating the optimum number of units to be operated at regular intervals, and comparing the optimum number of units with the number of units to be operated, if the actual number of chilled water heaters is larger than the optimum number of units operated, If the actual number of chilled water heaters is less than the optimum number of units, the number of chilled water heaters is increased by one so that the number of chilled water heaters becomes the optimum number of units. When the number of water machines is increased, the inverter-driven chiller / heater is prioritized, and when the number is decreased, the commercial power-driven chiller / heater is prioritized and stopped, and the chilled water outlet temperature setting temperature of the chiller / heater is set. Enable cascade control and commercial Source driving chiller as compared with the inverter-driven chiller. Thus apply much load giving load signal chilled water set temperature constant Drops Ru or compressor, over a partial load from the maximum load efficiency The operation cost can be reduced and the running cost can be reduced, and the total cost of the connected chilled water heater can be kept low and the efficiency can be improved compared to the case where all the units are composed of inverter driven chiller water heaters. A method for operating a water-cooled / hot water machine can be provided.

According to the second aspect of the present invention, during the hot water operation , each chilled water heater controls the temperature of each hot water outlet to a predetermined constant temperature, the number of connected chilled water heaters, the hot water inlet / outlet set temperature difference, and the hot water inlet temperature. By calculating the optimum number of units to be operated at regular intervals, and comparing the optimum number of units with the number of units to be operated, if the actual number of chilled water heaters is larger than the optimum number of units operated, Reduce the number of units, and if the actual number of chilled water heaters is smaller than the optimum number of units operated, the number of chilled water heaters is increased by one and the chilled water heaters are operated to the optimum number. during operation number increases of the machine is operated with priority inverter drive chiller, when the number of operating units decreases to stop in favor of the commercial power supply driven chiller, hot water outlet set temperature of the chiller can cascade control So that commercial power supply cold Machine as compared with the inverter-driven chiller. Thus the hot water set temperature put a lot of load giving load signal to or compressor raises certain value, efficient operation over a partial load from the maximum load possible with the running cost can be reduced, the total number of suppressing the initial cost of the whole connecting chiller compared when an inverter drive chiller and connected chiller can improve efficiency Can provide driving methods.

According to the invention described in claim 3 , each chiller / heater controls the chilled water outlet temperature to a predetermined constant temperature during the refrigeration operation, the number of chilled water heaters connected, the chilled water inlet / outlet set temperature difference, and the chilled water inlet temperature. To calculate the optimal number of chilled water heaters at regular intervals, and if the actual number of chilled water heaters is greater than a predetermined value by the comparison of the optimal number of operatable units Decrease by 1 unit, and if the actual number of chilled water heaters is less than a predetermined value below the optimum number of operated units, increase the number of chilled water heaters by one so that the number of chilled water heaters becomes the optimum number The operation control means prioritizes inverter-driven chiller / heater when the number of chilled water heaters increases, and prioritizes commercial power-driven chiller / heater when the number of chilled water heaters decreases. Stop and use multiple water heaters Capable of cascade control of the chilled water outlet temperature, and the commercial power supply hot water heater has a function of lowering the chilled water temperature by a constant value or giving a load signal to the compressor to increase the load compared to the inverter driven chiller / heater. As a result, it is possible to operate efficiently from the maximum load to a partial load, reducing running costs, and the initials of the whole connected chiller / heater compared to the case where all units are composed of inverter-driven chiller / heaters. It costs less, and kill the connecting chiller can improve the efficiency in provision.

According to the fourth aspect of the present invention, each hot / cold water heater controls each hot water outlet temperature to a predetermined constant temperature during the hot water operation, depending on the number of connected hot / cold water heaters, the hot water inlet / outlet temperature difference, and the hot water inlet temperature. Calculate the optimum number of units to be operated at regular intervals and compare the optimum number of units with the number of units to be operated. If the actual number of chilled water heaters is greater than the optimum number If the actual number of chilled water heaters is smaller than the optimum number of units, the number of chilled water heaters is increased by one so that the number of chilled water heaters becomes the optimum number When the number of chilled water heaters increases , the operation control means gives priority to inverter-driven chiller water heaters, and when the number of chilled water heaters decreases, the commercial power source chilled water heaters stop. together, out of the hot water of a plurality of hot and cold water machine The set temperature to allow cascade control, line power chiller as compared with the inverter-driven chiller, so put more load giving load signal hot water set temperature constant Drops Ru or compressor functions As a result, it is possible to operate efficiently from the maximum load to a partial load, reducing running costs, and the initials of the whole connected chiller / heater compared to the case where all units are composed of inverter-driven chiller / heaters. It is possible to provide a connected chiller / heater that can keep costs low and improve efficiency.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the following description mainly demonstrates the form of the freezing operation which uses a cold / hot water machine as a refrigerator. FIG. 1 is a diagram showing a configuration example of a connected chiller / heater according to the present invention. As shown in FIG. 1, this connected chiller / heater includes one master chiller / heater 11 and two slave chillers 12-1 and 12-2. The parent machine cold / hot water machine 11, the child machine cold / hot water machine 12-1, and the child machine cold / hot water machine 12-2 are connected to the cold water pipe 14 by the reverse ring water method via the header 13. The cold water W is configured to flow evenly from the main device cold / hot water machine 11, the child machine cold / hot water machine 12-1, and the child machine cold / hot water machine 12-2.

  Here, the parent / cooling / hot water machine 11 and the child's cooling / heating machine 12-1 are commercial power source driven cold / hot water machines that are driven by directly supplying commercial power from a commercial power source (without frequency conversion). The chiller / heater 12-2 is an inverter-driven chiller / heater that drives the electric power from a commercial power source by converting the voltage and frequency through an inverter and supplying the converted electric power to the drive motor. In addition, this connected chiller / heater can connect up to four slave chillers 12.

  A chilled water inlet temperature sensor 16 is attached to the chilled water inlet pipe 15 of the parent chiller / hot water machine 11, and each of the parent chiller / hot water machine 11, the child chiller / hot water machine 12-1, and the child machine chiller / heater 12-2. A cold water outlet temperature sensor 18 is attached to the cold water outlet pipe 17. An operation panel 19 is provided in each of the parent machine cold / hot water machine 11, the child machine cold / hot water machine 12-1, and the child machine cold / hot water machine 12-2, and a CPU (not shown) is incorporated therein. Each operation panel 19 is connected by an inter-module communication wiring 20, and the inlet temperature is set by cold water from the parent machine cooling / heating machine 11 to the child machine cooling / heating machines 12-1, 12-2, the child machine cooling / heating machine 12-1. Data transmission is performed from 12-2 to the main unit cold / hot water machine 11. In addition, the parent / cooling / hot water machine 11 is remotely controlled via a remote signal line 23.

  The control panel 19 of the master chiller / heater 11 has a chilled water inlet temperature detected by the chilled water inlet temperature sensor 16, a chilled water outlet temperature detected by the junction chilled water outlet temperature sensor 22, and a remote control signal S from the remote signal line 23. Is entered. The operation panel 19 of each chiller / heater is provided with a temperature controller 24 so that the output of the chilled water outlet temperature sensor 18 is input. Further, a temperature setting control unit 25 is provided in the parent / cooling / hot water machine 11 so as to control the set temperature of each cooling / heating machine.

  Each of the main unit cold / hot water machine 11, the sub-unit cold / hot water machine 12-1, and the sub-unit cold / hot water machine 12-2 changes the suction air volume of the compressor to control the cold water outlet temperature to a constant value. Further, in the operation panel 19 of the main unit chiller / heater 11, in order to control the average temperature of each chiller / heater outlet temperature or the temperature of the junction, the chilled water or outlet set temperature of each chiller / heater is cascade controlled. Yes. Reference numeral 21 denotes a chilled water pump, and the chilled water W from the chilled water pump 21 passes through the chilled water pipe 14, the header 13, and the chilled water inlet pipes 15, 15, and 15, and the master chiller / heater 11 and the slave chiller / heater 12-1. And the cold water of each evaporator 33 are discharged through the cold water outlet pipes 17, 17, 17 and merge with the cold water pipe 14 on the outlet side.

  FIG. 2 is a diagram illustrating a configuration example of a parent machine cooling / heating machine 11 and a child machine cooling / heating machine 12-1, which are commercial power supply driven cooling / heating machines. The commercial power supply driven chiller / heater includes a compressor 30, a condenser 31, an expansion valve 32, and an evaporator 33, and these devices are connected by a refrigerant pipe 34. Refrigerant vapor evaporated in the evaporator 33 is sucked into the compressor 30 and compressed into high-temperature and high-pressure refrigerant vapor, cooled in the condenser 31 with cooling water passing through the cooling water pipe 35, and becomes refrigerant condensed liquid. The refrigerant condensate is depressurized to a low pressure and a low temperature by the expansion valve 32, enters the evaporator 33 and evaporates, and cools the cold water passing through the cold water inlet pipe 15.

  A commercial power supply (AC) is supplied to the drive motor 39 of the compressor 30 via the wiring breaker 37 and the star-Δ contactor 38, and the compressor rotor 44 is operated by rotating the compressor rotor 44 at about 3600 rpm at 60 Hz. ing. The cold water outlet temperature detected by the cold water outlet temperature sensor 18 provided at the outlet of the cold water outlet pipe 17 is sent to the temperature controller 24. The temperature regulator 24 opens and closes the capacity electromagnetic valve 41, and the piston 42 is operated to slide. The valve 43 is moved to control the suction air volume continuously and continuously so that the cold water outlet temperature is constant.

  FIG. 3 is a diagram showing a configuration example of a slave unit chiller / heater 12-2 that is an inverter-driven chiller / heater. The inverter-driven chiller / heater includes a compressor 30, a condenser 31, an expansion valve 32, and an evaporator 33, and these devices are connected by a refrigerant pipe 34. Refrigerant vapor evaporated in the evaporator 33 is sucked into the compressor 30 and compressed into high-temperature and high-pressure refrigerant vapor, cooled in the condenser 31 with cooling water passing through the cooling water pipe 35, and becomes refrigerant condensed liquid. The refrigerant condensate is depressurized to a low pressure and a low temperature by the expansion valve 32, enters the evaporator 33 and evaporates, and cools the chilled water passing through the chilled water inlet pipe 15 in the same manner as the commercial power supply driven chiller / heater shown in FIG. is there.

  The commercial power supply (AC) is supplied to the inverter 46 through the wiring breaker 37, and is supplied to the drive motor 39 of the compressor 30 by changing the voltage and frequency. The cold water outlet temperature detected by the cold water outlet temperature sensor 18 provided at the outlet of the cold water outlet pipe 17 is sent to the temperature controller 24, and the inverter 46 is controlled by the temperature controller 24 to increase or decrease the rotational speed of the drive motor 39. Thus, the cold water outlet temperature is controlled to be constant by changing the amount of air sucked into the compressor 30.

  FIG. 4 shows the partial load characteristics of the commercial power supply driven chiller / heater that is the slide valve control and the inverter driven chiller / heater that is the rotational speed control. In FIG. 4, a curve A shows a partial load characteristic of a commercial power supply driven chiller / heater, and a curve B shows a partial load characteristic of an inverter driven chiller / heater. As shown in the figure, in the vicinity of the maximum load (100%), in the inverter-driven chiller / heater, the efficiency of the inverter 46 is reduced by 2-4% compared to the commercial power-driven chiller / heater, but the partial load is reduced. Then, the inverter-driven chiller / heater can operate more efficiently.

As described above, the connected cold / hot water machine 11 is a combination of the parent / cooling / hot water machine 11 and the child machine / cooling / heating machine 12-1, which are commercial power supply-driven cooling / heating machines, and the child machine cooling / heating machine 12-2, which is an inverter-driven cooling / heating machine. In the water machine, high efficiency operation is possible by controlling the number of commercial power source driven chiller / heater units and inverter driven chiller / heater units according to the load. Here, the number N of chilled / hot water units set in the main unit chiller / hot water device 11, the chilled water inlet / outlet set temperature difference is DT (when 100% load is set), the chilled water outlet set temperature Sv, and the actual load. Obtain the optimum number of units (required number of units) r from the following formula using the cold water inlet temperature Ti,
r = {N × (Ti−Sv)} / DT
From the difference from the number of operating units R, maintaining the number of operating units at the current state or increasing / decreasing the number of units at a certain time and operating with the optimal number of units enables high-efficiency operation of the entire connected chiller / heater.

  FIG. 5 is a diagram showing a unit operation flow during cooling in the connected chiller / heater. It is determined whether or not [r + 1 + α] <R continuously for a predetermined time (3 minutes in the present embodiment) (step ST1). If YES, the operation of the commercial power supply chiller / heater is reduced by one, that is, The commercial power supply chiller / heater is preferentially stopped (step ST2), and if NO, it is determined whether or not R <[r−α] continuously for a predetermined time (in this embodiment, 3 minutes) (step ST3). If YES, the number of inverter-driven chiller / heaters is increased by one, that is, the inverter-driven chiller / heater is operated with priority (step ST4). If NO, the process returns to step ST1 and the process is repeated.

  FIG. 6 is a diagram showing a calculation result of the number of cooling units during cooling. In FIG. 6, the horizontal axis indicates the chilled water temperature [° C.] and the required number r of chilled water heaters, and the ordinate indicates the number R of operating water. Here, a case where the cold water outlet temperature of the cold / hot water machine is maintained and controlled at a constant temperature of 7 ° C. is shown. As shown in the figure, in the operation of one or two chiller / heaters, when the chilled water inlet temperature decreases by α, one chiller / heater is stopped, and when α rises, one additional chiller / heater is operated.

  By calculating the optimal number of chilled water heaters at regular intervals and maintaining the current number of chilled water heaters or increasing or decreasing them one by one, the change in the chilled water outlet temperature at the merging section during unit operation can be reduced. Since the chilled water W can be supplied at a stable temperature and at the same time the chiller / heater is not started at the same time, the influence of the starting current on the power supply system can be reduced. Furthermore, when the cold water outlet temperature falls by 2 ° C. below a predetermined value, it is automatically stopped to prevent the outlet temperature of the cold / hot water from dropping too much.

  FIG. 7 is a diagram showing a partial load characteristic during a connected operation of a connected chiller / heater equipped with a plurality of chiller / heaters. In FIG. 7, a curve A indicates two commercial power source driven chiller / heaters (master chiller / heater 11 and slave chiller / heater 12-1) and one inverter-driven chiller / heater (child slave) according to the present embodiment. The partial load characteristics of a connected chiller / heater consisting of a chiller / heater 12-2), curve B shows the partial load characteristics of all three chiller / heaters, and curve C shows the chill / cooler All water machines show the partial load characteristics of commercial power supply chilled / hot water machines.

  As shown by the curve A, in the connected chiller / heater according to the present embodiment, the commercial power supply chiller / warm water machine (the master chiller / heater 11 and the slave chiller / heater 12-1) sets the chilled water outlet temperature to (1). Reduce the temperature by 5 ° C to 5.5 ° C so that the load is applied, and the inverter-driven chiller / heater 12-2 has a higher chilled water outlet set temperature than the commercial power-driven chiller / heater. By operating at a partial load, a high COP at a large load of the commercial power supply driven chiller / heater and a high COP at a partial load of the inverter driven chiller / heater can be used effectively. The COP can be increased while keeping the initial cost increase to a minimum value compared to the driving chiller / heater. In addition, even when the entire curve B is near 100% and near the minimum load even when compared to the inverter-driven chiller / heater, high-efficiency operation can be performed, and the initial cost can be kept low.

  Commercial power-driven chiller / heater (master chiller / heater 11 and slave chiller / heater 12-1) is operated by lowering the chilled water outlet temperature set temperature or by applying a load by giving a load signal, and the remaining load is invertered By performing partial load operation with the driving chiller / heater (here, the slave chiller / heater 12-2), it is possible to reduce the initial cost of the coupled chiller / heater as a whole and improve the efficiency.

  In the above embodiment, the mode of the refrigeration operation has been mainly described, but the details of the piping and the like are illustrated even when operated as a hot water machine that takes out the fluid at the outlet of the condenser as hot water by switching the flow path of cold water or cooling water. Is omitted, but can be controlled similarly. Similar to that shown in FIG. 6, the number control based on the number of connections N, the inlet / outlet set temperature difference DT, the outlet set temperature Sv, and the inlet temperature Ti (the temperature in this case is the hot water temperature) is possible. In addition, commercial power supply chilled water heaters are operated by raising the hot water outlet temperature set temperature or by applying a load by giving a load signal, and by operating the remaining load partly with an inverter driven chiller water heater. The initial cost of the entire water machine can be reduced and the efficiency can be improved as in the case of operating the refrigerator.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

It is a figure which shows the structural example of the connection type cold / hot water machine which concerns on this invention. It is a figure which shows the structural example of the commercial power source drive cold / hot water machine used for the connection type cold / hot water machine which concerns on this invention. It is a figure which shows the structural example of the inverter drive cold / hot water machine used for the connection type cold / hot water machine which concerns on this invention. The partial load characteristics of commercial power supply driven chilled water heaters and inverter driven chilled water heaters are shown. It is a figure which shows the number operation flow at the time of cooling of the connection type cold / hot water machine which concerns on this invention. It is a figure which shows the unit operation calculation result at the time of cooling of the connection type | mold cold / hot water machine which concerns on this invention. It is a figure which shows the partial load characteristic at the time of the connection driving | operation of a connection type | mold cold / hot water machine.

Explanation of symbols

11 Chiller / Hot Water Machine 12 Child Machine Chiller / Heater 13 Header 14 Chilled Water Pipe 15 Chilled Water Inlet Pipe 16 Chilled Water Inlet Temperature Sensor 17 Chilled Water Outlet Pipe 18 Chilled Water Outlet Temperature Sensor 19 Operation Panel 20 Module Communication Wiring 21 Chilled Water Pump 22 Merged Port Chilled Water Outlet temperature sensor 23 Remote signal line 24 Temperature controller 25 Temperature setting control unit 30 Compressor 31 Condenser 32 Expansion valve 33 Evaporator 34 Refrigerant piping 35 Cooling water piping 38 Star-Δ contactor 39 Drive motor 41 Capacitance solenoid valve 42 Piston 43 Slide valve 44 Compressor rotor 46 Inverter

Claims (4)

Commercial power from a commercial power source connected to a common chilled water pipe is supplied to and driven by a drive motor without frequency conversion, and commercial power from the commercial power source is supplied via an inverter. A method of operating a connected chiller / heater comprising at least one inverter-driven chiller / heater that converts the frequency and supplies the drive motor to the drive motor ,
Wherein when the chiller is freezing operation, controls the coolant outlet temperature of each predetermined constant temperature, coupling number of the chiller, the cold water inlet and outlet set temperature difference, the optimal number of operating at regular intervals by the cold water inlet temperature By calculating and comparing the optimum number of operating units with the number of operating units, if the actual number of operating chilled water heaters is larger than the optimum operating number by a predetermined value or more, the number of operating chilled water heaters is decreased by one, If the number of chilled water heaters is less than a predetermined value below the optimum operating number, the number of chilled water heaters is increased by one and the number of chilled water heaters is operated to be the optimum number of operations,
When the number of operating chilled water heaters is increased, the inverter driven chilled water heater is prioritized, and when the operating number is decreased, the commercial power driven chilled water heater is prioritized and the chilled water outlet of the chilled water heater is Enables cascade control of temperature setting temperature,
Compared with the inverter-driven chiller / heater, the commercial power-driven chiller / heater is configured to reduce the set temperature of the chilled water by a certain value or to provide a load signal to the compressor to increase the load. How to drive a water machine. Commercial power from a commercial power source connected to a common hot water pipe is supplied to and driven by a drive motor without frequency conversion, and commercial power from the commercial power source is supplied via an inverter. A method of operating a connected chiller / heater comprising at least one inverter-driven chiller / heater that converts the frequency and supplies the drive motor to the drive motor ,
During the hot water operation, each of the hot / cold water heaters controls the temperature of each hot water outlet to a predetermined constant temperature, and selects the optimum number of units to be operated at fixed time intervals depending on the number of connected hot / cold water heaters, the hot water inlet / outlet set temperature difference, and the hot water inlet temperature. By calculating and comparing the optimum number of operating units with the number of operating units, if the actual number of operating chilled water heaters is larger than the optimum operating number by a predetermined value or more, the number of operating chilled water heaters is decreased by one, If the number of chilled water heaters is less than a predetermined value below the optimum operating number, the number of chilled water heaters is increased by one and the number of chilled water heaters is operated to be the optimum number of operations,
When the number of operating chilled water heaters increases, the inverter driven chilled water heater is prioritized, and when the operating number decreases, the commercial power supply chilled water heater is prioritized and stopped, and the hot water outlet of the chilled water heater Enables cascade control of the set temperature,
Compared with the inverter-driven chiller / heater, the commercial power-driven chiller / heater increases the set temperature of the hot water by a constant value or gives a load signal to the compressor to increase the load. How to drive a water machine. It is a connected chiller / heater with multiple chiller / heaters connected to a common chilled water pipe,
At least one of the commercial power source driving Dohiya water heater driving said plurality of chiller the commercial electric power from commercial power supplied to the drive motor without a frequency converter, an inverter and the commercial electric power from commercial power supply through the at least one inverter drive Dohiya water heater driving is supplied to the drive motor and frequency conversion,
Wherein when the chiller is freezing operation, controls the coolant outlet temperature of each predetermined constant temperature, connection speed of the cold temperature water machine, cold water inlet and outlet set temperature difference, the optimal number of operating units by cold water inlet temperature at predetermined time intervals When the actual number of chilled water heaters is greater than a predetermined value by the comparison of the optimum number of operated units and the number of operated units, the number of chilled water heaters is decreased by one, If the number of chilled water heaters is less than a predetermined value below the optimum operating number, the number of chilled water heaters is increased by one so that the number of chilled water heaters is equal to the optimum number. comprising operation control means for,
The operation control means prioritizes the inverter-driven chiller / heater when the number of chilled / hot water machines is increased, and prioritizes and stops the commercial power-driven chiller / heater when the number of operated units decreases, The chilled water outlet temperature of a plurality of chilled water heaters can be cascade-controlled, and the commercial power supply chilled water heater lowers the chilled water temperature or gives a load signal to the compressor as compared with the inverter driven chiller water heater. The connected chiller / heater is equipped with a function to increase the load . It is a connected chiller / heater with multiple chiller / heaters connected to a common chilled water pipe,
At least one commercial power supply driven chiller / heater that drives the plurality of chiller / heaters by supplying commercial power from a commercial power supply to a drive motor without frequency conversion, and commercial power from the commercial power supply via an inverter And at least one inverter-driven chiller / heater that converts the frequency and supplies it to the drive motor for driving.
Each hot / cold water heater controls each hot water outlet temperature to a predetermined constant temperature during hot water operation, and calculates the optimum number of units to be operated at fixed time intervals based on the number of connected hot / cold water heaters, hot water inlet / outlet temperature difference, and hot water inlet temperature. Then, by comparing the optimum number of operating units with the number of operating units, if the actual number of operating chilled water heaters is larger than the optimum operating number by a predetermined value or more, the number of operating chilled water heaters is decreased by one, If the number of chilled water heaters is less than a predetermined value below the optimum operating number, the number of chilled water heaters is increased by one so that the number of chilled water heaters is equal to the optimum number. With control means,
The operation control means prioritizes the inverter-driven chiller / heater when the number of chilled / hot water machines is increased, and prioritizes and stops the commercial power-driven chiller / heater when the number of operated units decreases, a plurality hot water outlet set temperature of the hot and cold water machine to be able to cascade control, the line power chiller as compared to the inverter drive chiller, whether or compressor load signal Ru constant Drops hot water set temperature A connected chiller / heater characterized by the ability to apply and load more.

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