JP6681896B2 - Refrigeration system - Google Patents

Description

  The present invention relates to a refrigeration system that uses a heat pump chiller as a heat source.

  As a refrigeration system using a heat pump chiller as a heat source device, there is an air conditioning system provided with a water circuit for circulating water as a heat medium in a building or a building such as a large-scale commercial facility. In this type of air conditioning system, the water in the water circuit is passed through a fan coil unit or an air handling unit that is a load side device, and the heat of the water is used for cooling and heating.

  It is common to use multiple heat pump chillers and load side devices for each water circuit, and after merging the water from each load side device at the header, distribute it to each heat pump chiller and circulate the water. I am trying to let you.

  To save power, it is effective to use a heat pump chiller compressor and a water circulation pump that support inverters.To control these inverters, measure the water temperature in the header and perform optimal control for the load. I'm building.

  Further, in an air conditioning system having a plurality of heat pump chillers, not only inverter control but also the number of operating heat pump chillers are controlled to realize power saving.

  Then, as a prior example of measuring the water temperature in the header and controlling the operating number of heat pump chillers for power saving, there is Patent Document 1. This patent document 1 discloses an air conditioning system that measures the water temperature in the header and controls so that only the minimum necessary number of units are operated.

Japanese Patent No. 3320631

  The conventional air conditioning system described in Patent Document 1 controls the number of operating heat pump chillers based on only the water temperature in the header, and the water temperature in the header alone is insufficient as circulating water information for the load side device. . Therefore, the current heat quantity of the load side apparatus, that is, the current heat quantity that can be supplied from the load side apparatus to the air conditioning load cannot be accurately grasped. Therefore, there is a possibility that the heat pump chiller is operated so as to supply an excessive amount of heat to the load side device, which causes a decrease in the efficiency of the entire air conditioning system.

  The present invention has been made to solve the above problems, and provides a refrigeration system capable of improving the efficiency of the refrigeration system by accurately grasping the current amount of heat of the load side device. With the goal.

A refrigeration system according to the present invention is a load including a plurality of heat source units having a heat source side heat exchanger and a compressor for exchanging heat between a refrigerant and a heat medium, and a fan coil having a load side heat exchanger and a fan. Side device, the heat source side heat exchanger and the load side heat exchanger of the load side device are connected by piping, the heat medium is circulated by a pump, and the heat medium circuit that conveys the amount of heat supplied by the heat source device to the load side device , A heat medium temperature sensor for detecting the temperature of the heat medium, a heat medium pressure sensor for detecting the pressure of the heat medium, and a temperature of the intake air to the fan coil as a load index for judging the load in the load side device. To the values obtained from each of the heat medium temperature sensor, the heat medium pressure sensor, and the suction temperature sensor, and the motorized valve that adjusts the flow rate of the heat medium that flows into the heat exchanger on the load side of the fan coil. On the basis of And a control unit for controlling the respective operation of the compressor and the pump, control unit, now the heat between the heat medium and the load side air is heat to heat exchange in the load-side heat exchanger of the load-side apparatus, the load Calculated based on the temperature of the heat medium at the inlet and outlet of the side heat exchanger and the pressure of the heat medium at the inlet and the outlet of the load side heat exchanger, and set the suction temperature detected by the suction temperature sensor to the target temperature. If the difference between the required heat quantity, which is the heat quantity required to achieve this, and the current heat quantity is less than the preset heat quantity, change the operating conditions of the compressor and pump so that the necessary heat quantity is obtained. Without controlling the opening of the motorized valve, if the difference is larger than the set heat amount, the operation of the compressor and the pump is controlled so that the required heat amount is obtained.When controlling the compressor, compression Using the information indicating the relationship between the load factor and the compressor efficiency of the compressor, the number of compressors and the number of compressors operating so that the compressors of multiple heat source units are operated at the load factor that maximizes the compressor efficiency. When determining the operating capacity and controlling the pump, the pump is controlled to obtain the circulating amount of the heat medium optimized so that the temperature of the heat medium at the outlet of the heat source side heat exchanger is maintained at the set temperature. To do.

  According to the present invention, it is possible to obtain a refrigeration system capable of improving the efficiency of the refrigeration system by accurately grasping the current amount of heat of the load side device.

It is a block diagram which shows the structure of the air conditioning system which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the air conditioning system which concerns on Embodiment 1 of this invention. It is a figure showing the relation between the load factor of a compressor and compressor efficiency. It is a schematic block diagram of the hot water supply system which concerns on Embodiment 2 of this invention. 5 is a flowchart showing an operation of the hot water supply system according to Embodiment 2 of the present invention.

Embodiment 1.
As an example of the refrigeration system, the air-conditioning system will be described here as a first embodiment.

  FIG. 1 is a block diagram showing a configuration of an air conditioning system according to Embodiment 1 of the present invention. The air conditioning system has a heat pump chiller 1 which is a heat source device installed outdoors, a load side device 2 which is an indoor unit installed indoors, and a pump 3, and a heat medium in which water as a heat medium circulates. And a water circuit 4 which is a circuit. The water circuit 4 is a circuit that connects the heat pump chiller 1 and the load side device 2 with piping and circulates water by the pump 3 to convey the amount of heat supplied by the heat pump chiller 1 to the load side device 2. Although FIG. 1 illustrates the case where two heat pump chillers 1 and two load side devices 2 are installed, the number of installed units is not limited.

  The heat pump chiller 1 includes a compressor 11 whose operating capacity is variable by an inverter, and a water-refrigerant heat exchanger 12 as a heat source side heat exchanger for heating or cooling circulating water to a target temperature by heat of a refrigerant such as CFC. It has and. The heat pump chiller 1 has a refrigerant circuit (not shown) including a compressor 11, a pressure reducing device, and a heat exchanger, and the refrigerant in the refrigerant circuit in which the refrigerant circulates and the circulating water in the water circuit 4 are water refrigerants. By exchanging heat with the heat exchanger 12, it functions as a heat source device that supplies the heat of the refrigerant to the load side device 2. The water circuit 4 circulates water between the water-refrigerant heat exchanger 12 of the heat pump chiller 1 and a load side heat exchanger 21a of a fan coil 21 of the load side device 2 described later.

  The load side device 2 includes a fan coil 21 and a motor-operated valve 22. The fan coil 21 includes a load side heat exchanger 21a and a fan 21b that allows air to pass through the load side heat exchanger 21a. The fan coil 21 exchanges heat between the circulating air of the water circuit 4 and the load-side heat exchanger 21a to cool the load-side air, and cools the load-side air into the room, and the load-side air. A heating operation is performed in which the circulating water in the water circuit 4 and the load side heat exchanger 21a exchange heat to heat and the heated load side air is supplied into the room. The motor-operated valve 22 adjusts the amount of circulating water flowing into the load-side heat exchanger 21a in the water circuit 4.

  The load side device 2 further includes a temperature sensor 23 (23a, 23b) that is a heat medium temperature sensor, a pressure sensor 24 (24a, 24b) that is a heat medium pressure sensor, and a suction temperature sensor 25 that is a load index sensor. And a humidity sensor 26.

  The temperature sensor 23a is arranged in the water inlet pipe of the load side heat exchanger 21a and detects the temperature of the circulating water at the inlet of the load side heat exchanger 21a. The temperature sensor 23b is arranged in the water outlet pipe of the load side heat exchanger 21a and detects the temperature of the circulating water at the outlet of the load side heat exchanger 21a.

  The pressure sensor 24a is arranged in the water inlet pipe of the load side heat exchanger 21a and detects the pressure of the circulating water at the inlet of the load side heat exchanger 21a. The pressure sensor 24b is arranged in the water outlet pipe of the load side heat exchanger 21a and detects the pressure of the circulating water at the outlet of the load side heat exchanger 21a.

  The intake temperature sensor 25 is arranged on the windward side of the fan 21b of the fan coil 21, and detects the temperature of the intake air that is the load side air. Like the temperature sensor, the humidity sensor 26 is also arranged on the windward side of the fan 21b of the fan coil 21, and detects the humidity of the intake air.

  Detection signals of these sensors 23 to 26 are output to a load side control device 27 described later.

  The load side device 2 further includes a load side control device 27 that receives the detection signals of the sensors 23 to 26, and a central control device 50 that controls the entire air conditioning system.

  The load-side control device 27 transmits signals of the sensors 23 to 26 in the load-side device 2 to the central control device 30 described later via the control signal line 31, and calculates the amount of heat required by the load-side device 2. To do The load-side control device 27 can be configured by hardware such as a circuit device that realizes its function, or can be configured by an arithmetic device such as a microcomputer and a CPU and software executed on the arithmetic device. it can.

  The central controller 30 calculates optimum operating conditions based on the information obtained from each of the heat pump chiller 1, the pump 3, and the load side device 2 connected by the control signal line 31, and the heat pump chiller 1 and the pump 3 are connected to each other. The operation instruction is output to and controlled. The central control device 30 can be configured by hardware such as a circuit device that realizes its function, or can be configured by an arithmetic device such as a microcomputer and a CPU and software executed on the arithmetic device. .

  In addition, here, the configuration is shown in which the operation control of the entire air conditioning system is performed by the data communication between the load-side control device 27 and the central control device 30 to perform cooperative processing. The configuration may be such that the central controller 30 also controls the operation of the entire air conditioning system by providing the function of 27. The load side control device 27 and the central control device 30 form a control device according to the present invention.

FIG. 2 is a flowchart showing the operation of the air conditioning system according to Embodiment 1 of the present invention.
In the air conditioning system configured as above, the temperature and humidity of the intake air are detected using the intake temperature sensor 25 and the humidity sensor 26 (S1). Then, the load-side control device 27 determines whether the suction air temperature detected by the suction temperature sensor 25 matches the target temperature (S2). The intake air temperature detected by the intake temperature sensor 25 corresponds to a load index for determining the current load on the load side. Then, if the intake air temperature does not match the target temperature, the load-side control device 27 determines the amount of heat required to bring the intake air temperature to the target temperature by using the intake air sensor 25 and the humidity sensor 26. The calculation is performed based on the temperature and humidity (S3).

  In calculating the "required heat quantity", more accurate heat quantity can be calculated by using the intake air humidity in addition to the intake air temperature. That is, for example, when cooling a place where the temperature and humidity are high, it is necessary to remove heat including latent heat in order to cool the air while changing the water vapor in the air into water. Therefore, when the humidity is high, more cooling capacity is required than when the humidity is low. By taking latent heat into consideration in this way, a more accurate “required heat quantity” can be calculated. From the above viewpoint, it is preferable to use the suction air humidity when calculating the “required heat quantity”, but at least the suction air temperature may be used.

  Next, the load-side control device 27 detects the water temperature and water pressure of the circulating water using the temperature sensor 23 and the pressure sensor 24, and determines the “current heat quantity that can be supplied from the load-side heat exchanger 21a to the air conditioning load”. Calculate (S4). Hereinafter, the information on the water temperature and the water pressure of the circulating water may be referred to as load-side control information.

  Then, the load-side control device 27 determines whether or not the "required heat amount" can be obtained by adjusting the opening degree of the motor-operated valve 22 and changing the flow rate of the circulating water flowing through the load-side heat exchanger 21a. Yes (S5). This determination is made by comparing the difference between the "necessary heat quantity" and the "current heat quantity that can be supplied from the load side heat exchanger 21a to the air conditioning load" with a preset heat quantity. That is, when the difference between the "required heat quantity" and the "current heat quantity that can be supplied from the load side heat exchanger 21a to the air conditioning load" is smaller than the set heat quantity, the opening degree of the electrically operated valve 22 is adjusted to adjust the load side heat quantity. It is determined that the "required heat quantity" can be obtained by changing the flow rate of the exchanger 21a. On the other hand, when the difference between the "required heat amount" and the "current heat amount that can be supplied from the load side heat exchanger 21a to the air conditioning load" is larger than the set heat amount, the load side control device 27 causes the opening degree of the motor-operated valve 22 to open. It is judged that the "necessary amount of heat" cannot be obtained by adjustment.

  When the load side control device 27 determines that the "necessary heat amount" can be obtained by adjusting the opening amount of the electric valve 22, the load side control device 27 adjusts the opening amount of the electric valve 22 according to the "necessary heat amount" (S6), It returns to step S4.

  On the other hand, when the load-side control device 27 determines that the "necessary heat amount" cannot be obtained by adjusting the opening degree of the motor-operated valve 22, the load-side control device 27 controls the information indicating that, that is, the information indicating that the operating condition needs to be changed. It is transmitted to the central control unit 30 via the signal line 31. Here, when the information indicating that the operating condition needs to be changed is transmitted from the load side control device 27 to the central control device 30, the current load side control obtained by the load side device 2 is added to this information. Information (water temperature and pressure of circulating water) is also transmitted.

  The processes of steps S1 to S6 described above are performed by each of the load-side control devices 27. Therefore, the information (including the load side control information) indicating that it is necessary to change the operating condition from some or all of the load side control devices 27 according to the heat quantity situation in each of the load side control devices 27 is in the center. It will be collected in the control device 30.

  Then, the central control device 30 is based on the operation information obtained from the heat pump chiller 1 and the pump 3 and the load side control information (circulation water temperature and water pressure) obtained from each load side control device 27 of the load side device 2. And controls the operation of each heat pump chiller 1 and pump 3. That is, the optimal operating conditions are calculated based on the operating information and the load-side control information, and operating instructions are output to each of the heat pump chillers 1 and the pump 3 (S7). Note that the operation information obtained from the heat pump chiller 1 and the pump 3 specifically corresponds to, for example, the current operation capacity.

  Here, since the efficiency of the compressor 11 most affects the realization of the power saving of the air conditioning system, the central control device 30 determines the operation instruction to operate the plurality of compressors 11 at the efficient load factor. To do. FIG. 3 below shows the load factor of the compressor 11.

  FIG. 3 is a diagram showing the relationship between the load factor of the compressor and the compressor efficiency. In the case of the compressor 11 having the relationship shown in FIG. 3, the efficiency is around 50% when the load factor in rated operation is 100%. Therefore, for example, 10 heat pump chillers 1 are installed, and if all 10 are operated at a load factor of 100%, the operation demand is 100%. It can be handled by operating at a rate of 100%. However, since the compression efficiency of this compressor 11 is better when it is operated at a load factor of 50% than when it is operated at a load factor of 100%, 10 compressors 11 are operated at a load factor of 50%. Further, when the operation request is 40%, eight compressors may be operated at a load factor of 50%.

  The operation request rate is obtained by calculating operation information obtained from the heat pump chiller 1 and the pump 3 and load side control information (circulating water temperature and water pressure) obtained from the load side device 2 in the central controller 30. The compressor 11 is controlled so that the load factor of the compressor 11 is optimized from the operation request rate, depending on the required heat quantity required.

  The compressor 11 of the heat pump chiller 1 is operated with the operating number and operating capacity optimized based on the above concept. That is, the central control device 30 operates under the optimum operating condition (operation of the compressor 11) so that the compressor 11 operates within a set load ratio range including a load ratio (here, 50%) that maximizes the compressor efficiency. The number of units and the operating capacity of the compressor 11) are determined.

  Further, the central control device 30 maintains the minimum water circulation amount required for operation in the water circuit 4 based on the water pressure obtained from the pressure sensor 10 of the load side device 2, while the outlet water temperature of the heat pump chiller 1 becomes the set water temperature. The operating capacity of the pump 3 is controlled so that a water circulation amount optimized to be maintained is obtained.

  As described above, according to the first embodiment, the amount of heat on the load side, that is, the “current amount of heat that can be supplied from the load side heat exchanger 21a to the air conditioning load” can be grasped using the water temperature and water pressure of the circulating water. Therefore, it is possible to grasp more accurately than in the conventional case where only the water temperature of the circulating water is used.

  Then, the operating capacity of the compressor 11 and the amount of circulating water are optimized based on the "required heat amount", the operating information of the heat pump chiller 1 and the pump 3, and the load side control information (water temperature and water pressure of the circulating water). Therefore, the effect of improving the efficiency of the entire air conditioning system can be obtained.

  Further, in calculating the "required heat quantity", the heat quantity can be calculated more accurately by using the suction air temperature detected by the humidity sensor 26 in addition to the suction air temperature detected by the suction temperature sensor 25. In this way, by performing the calculation of the "required heat quantity" using the humidity during cooling, it is possible to perform comfortable air conditioning in consideration of the humidity with high efficiency.

  If the difference between the "required heat quantity" and the "current heat quantity that can be supplied from the load side heat exchanger 21a to the air conditioning load" is smaller than the set heat quantity, change the operating conditions of the compressor 11 and the pump 3. It is possible to obtain the "necessary amount of heat" by controlling the motor-operated valve 22.

  Further, based on the water pressure detected by the pressure sensor 24, the pump is operated so that the outlet water temperature of the load side heat exchanger 21a is maintained at the set water temperature while maintaining the minimum circulation amount required for operation in the water circuit 4. 3 can be controlled.

  Further, by adding a user interface to the central controller 30 to prepare a monitoring environment, there is an effect that energy management and system monitoring for surely improving the efficiency of the entire air conditioning system can be performed.

  In the first embodiment, the heat medium circulating in the water circuit 4 is water, but it can be replaced with brine or the like in which water is mixed with an additive that lowers the freezing point.

Embodiment 2.
Although the air conditioner system was mentioned as an example of the refrigeration system in the above-mentioned Embodiment 1, Embodiment 2 explains an example of a hot water supply system.

FIG. 4 is a schematic configuration diagram of a hot water supply system according to Embodiment 2 of the present invention.
The hot water supply system includes a heat pump chiller 41 which is a heat source device functioning as a hot water supply device, a closed tank 42 which is a hot water storage tank for storing water heated by the heat pump chiller 41, and water heated by the heat pump chiller 41. Is stored in the closed tank 42, and a water circuit 44 that is a hot water supply circuit that supplies the hot water to the hot water supply terminal 43. The sealed tank 42 corresponds to the load side device of the present invention.

  The water circuit 44 includes a water circuit 44a and a water circuit 44b. The water circuit 44a is a circuit that connects the heat pump chiller 41 and the hermetically sealed tank 42 with a pipe and circulates water by the pump 49 to convey the amount of heat supplied by the heat pump chiller 1 to the hermetically sealed tank 42. The water circuit 44b is a circuit in which the closed tank 42 and the hot water supply terminal 43 are connected by a pipe, and water is circulated by a pump 45 which is a hot water supply terminal side pump.

  The hot water supply terminal 43 is, for example, a shower or a Karan. Although FIG. 4 shows the case where three heat pump chillers 1 are installed and one closed tank 42 is installed, the number of installed units is not limited.

  The configuration of the heat pump chiller 41 is the same as that of the heat pump chiller 1 according to the first embodiment shown in FIG. 1, and the compressor 11 whose operating capacity is variable by an inverter and the heat of the refrigerant such as CFC heats water to a target temperature. And a water-refrigerant heat exchanger 12 for The heat pump chiller 41 has a refrigerant circuit (not shown) including the compressor 11, a pressure reducing device, and a heat exchanger, and the refrigerant of the refrigerant circuit in which the refrigerant circulates and the water of the water circuit 44a are water refrigerant heat. By exchanging heat with the exchanger 12, it functions as a heat source unit that supplies the heat of the refrigerant to the sealed tank 42.

  The water circuit 44b is provided with a temperature sensor 46 (46a, 46b) that is a heat medium temperature sensor and a pressure sensor 47 (47a, 47b) that is a heat medium pressure sensor.

  The temperature sensor 46 a is arranged in the water inlet pipe of the sealed tank 42 and detects the temperature of the circulating water at the inlet of the sealed tank 42. The temperature sensor 46b is arranged in the water outlet pipe of the sealed tank 42 and detects the temperature of the circulating water at the outlet of the sealed tank 42. The temperature sensor 46b constitutes the load index sensor of the present invention.

  The pressure sensor 47 a is arranged in the water inlet pipe of the sealed tank 42 and detects the pressure of the circulating water at the inlet of the sealed tank 42. The pressure sensor 47b is arranged in the water outlet pipe of the sealed tank 42 and detects the pressure of the circulating water at the outlet of the sealed tank 42.

  The detection signals of these sensors 46 and 47 are output to a load side control device 48 described later.

  The hot water supply system further includes a load-side control device 48 that receives detection signals from the sensors 46 and 47, and a central control device 50 that controls the entire hot water supply system.

  The load-side control device 48 transmits the signals of the respective sensors 46 and 47 to the central control device 50 via the control signal line 51, and controls the amount of heat required to maintain the temperature in the sealed tank 42 at the target water temperature. To calculate. A pump 45 is connected to the load side control device 48. The load-side control device 48 can be configured by hardware such as a circuit device that realizes its function, or can be configured by an arithmetic device such as a microcomputer and a CPU and software executed on the arithmetic device. it can.

  The central control device 50 is connected to the heat pump chiller 41 and the load side control device 48 by the control signal line 51, and is optimal based on the information obtained from each of the heat pump chiller 41, the pump 45, and the load side control device 48. The operating condition is calculated and the operating instruction is output to the heat pump chiller 41 and the pump 45. The central control device 50 can be configured by hardware such as a circuit device that realizes its function, or can be configured by an arithmetic device such as a microcomputer or a CPU and software executed on the arithmetic device. .

  Here, the operation control of the entire hot water supply system is shown by performing the data communication between the load side control device 48 and the central control device 50 to perform cooperative processing, but the central control device 50 controls the load side control device. It is also possible to provide the functions of 48 and control the operation of the entire hot water supply system by the central controller 50. The load side control device 48 and the central control device 50 constitute the control device according to the present invention.

FIG. 5 is a flowchart showing an operation of the hot water supply system according to Embodiment 2 of the present invention.
In the hot water supply system thus configured, the temperature sensor 46 and the pressure sensor 47 are used to detect the water temperature and water pressure of the circulating water (S11). Then, the load-side control device 48 determines whether the outlet water temperature of the sealed tank 42 detected by the temperature sensor 46b matches the target water temperature (S12). The outlet water temperature detected by the temperature sensor 46b corresponds to a load index for determining the current load on the load side. Then, if the outlet water temperature does not match the target water temperature, the load-side control device 48 determines the “necessary heat amount” required to maintain the outlet water temperature at the target temperature based on the detection results of the temperature sensor 46 and the pressure sensor 47. Calculate (S13). The "necessary heat quantity" is also calculated in consideration of the "current heat quantity that can be supplied from the closed tank 42 to the hot water supply load". Specifically, the load-side control device 48 calculates based on the temperature difference between the outlet water temperature and the target water temperature and the detection results of the temperature sensor 46 and the pressure sensor 47.

  The heat quantity required to maintain the water temperature in the closed tank 42 at the target water temperature is also affected by the heat quantity flowing out from the hot water supply terminal 43, but the influence appears in the values of the temperature sensor 46 and the pressure sensor 47. Therefore, by using the values of the temperature sensor 46 and the pressure sensor 47, the amount of heat required to maintain the water temperature in the sealed tank 42 at the target water temperature, in consideration of the amount of heat flowing out from the hot water supply terminal 43, is set. Can be calculated.

  Then, the load-side control device 48 transmits the calculated “necessary heat amount” information to the central control device 50 via the control signal line 51.

  The central controller 50 calculates optimum operating conditions based on the “necessary amount of heat” transmitted from the load side controller 48 and the operating information of the heat pump chiller 41, and the compressor 11 and the pump 49 of each heat pump chiller 41. A driving instruction is output to (S14) to control each driving capacity. The concept of determining the number of operating compressors 11 of each heat pump chiller 41 and the operating capacities of the compressors 11 and the pumps 49 is the same as that of the first embodiment.

  Further, the load-side control device 48 detects a pressure drop in the water circuit 44b due to the use of the hot water supply terminal 43, by the pressure sensor 47 arranged in the water circuit 44b. Then, the load-side control device 48 controls the operating capacity of the pump 45 based on the detected water pressure so that a water circulation amount optimized to maintain the water pressure of the hot water supply terminal 43 at the set water pressure is obtained.

  Further, even when the hot water supply terminal 43 is not used, it is necessary to circulate the water up to the vicinity of the hot water supply terminal 43 so that hot water can be immediately supplied at the time of use. At that time, the load-side control device 48 operates the pump 45 to the minimum necessary so as to keep the temperature difference of the temperature sensor 46 at the inlet / outlet of the sealed tank 42 constant.

  As described above, according to the second embodiment, the current heat quantity and the necessary heat quantity that can be supplied from the closed tank 42 to the hot water supply load are calculated using the water temperature and pressure of the circulating water and the load index. It is possible to accurately grasp these heat quantities as compared with the conventional case where only the water temperature is used. As a result, the operating capacity and the amount of circulating water can be optimally adjusted, and the effect of improving the efficiency of the entire air conditioning system can be obtained.

  Further, by arranging the pressure sensor 47 in the water inlet pipe and the water outlet pipe of the closed tank 42 and issuing an operation instruction to the pump 45, a hot water supply system capable of maintaining the water pressure of the hot water supply terminal 43 can be realized. When the hot water supply terminal 43 is not used, the temperature sensor 46 is arranged in the water inlet pipe and the water outlet pipe of the hermetically sealed tank 42, and the pump 45 is operated at a necessary minimum, so that the temperature of the water circuit 44b during the warming operation is reduced. Power saving can be realized.

  By the way, the system described in the first and second embodiments is a system in which a heat pump chiller having a heat exchanger for heating or cooling water to a target temperature by heat of a refrigerant such as CFC is used as a heat source device. However, the refrigeration system of the present invention is not limited to the one using the above heat pump chiller as the heat source device. Needless to say, the present invention can be applied to other chillers, boilers, and systems using electric water heaters as heat sources.

1 heat pump chiller, 2 load side device, 3 pump, 4 water circuit, 5 control signal line, 6 control device, 7 relay board, 10 pressure sensor, 11 compressor, 12 water refrigerant heat exchanger, 21 fan coil, 21a load Side heat exchanger, 21b fan, 22 electric valve, 23 (23a, 23b) temperature sensor (heat medium temperature sensor), 24 (24a, 24b) pressure sensor (heat medium pressure sensor), 25 suction temperature sensor, 26 humidity sensor , 27 load side control device, 30 central control device, 31 control signal line, 41 heat pump chiller, 42
Closed tank, 43 hot water supply terminal, 44 (44a, 44b) water circuit, 45 pump, 46 (46a, 46b) temperature sensor (heat medium temperature sensor), 47 (47a, 47b) pressure sensor (heat medium pressure sensor), 48 load side control device, 49 pump, 50 central control device, 51 control signal line.

Claims (6)

A plurality of heat source units having a heat source side heat exchanger and a compressor that perform heat exchange between the refrigerant and the heat medium,
A load side device including a fan coil having a load side heat exchanger and a fan;
The heat source-side heat exchanger and the load-side heat exchanger of the load-side device are connected by piping to circulate the heat medium by a pump, and the heat supplied by the heat-source device is transferred to the load-side device. A medium circuit,
A heat medium temperature sensor for detecting the temperature of the heat medium,
A heat medium pressure sensor for detecting the pressure of the heat medium,
As a load index for determining the load in the load side device, a suction temperature sensor for detecting the temperature of the suction air to the fan coil,
An electric valve that adjusts the flow rate of the heat medium flowing into the load-side heat exchanger of the fan coil,
A heat medium temperature sensor, a control device for controlling the operation of each of the compressor and the pump based on the values obtained from each of the heat medium pressure sensor and the suction temperature sensor,
The control device is
Wherein in the load-side heat exchanger of the load-side apparatus and the heat medium of the current amount of heat is a heat load and air heat exchange, and the temperature of the heat medium in each of the inlet and outlet of the load-side heat exchanger Calculated based on the pressure of the heat medium at each inlet and outlet of the load side heat exchanger ,
If the difference between the required heat quantity that is the heat quantity necessary to bring the suction temperature detected by the suction temperature sensor to the target temperature and the current heat quantity is less than the preset heat quantity, then the necessary heat quantity In order to obtain the above, the operating conditions of the compressor and the pump are controlled to be widened without changing the operating conditions,
When the difference is larger than the set heat amount, the operation of the compressor and the pump is controlled so as to obtain the required heat amount,
When controlling the compressor, using the information indicating the relationship between the load factor of the compressor and the compressor efficiency, the compressors of the plurality of heat source units operate at the load factor that maximizes the compressor efficiency. As described above, the number of operating compressors and the operating capacity of the compressor are determined, and when controlling the pump, the temperature of the heat medium at the outlet of the heat source side heat exchanger is maintained at the set temperature. A refrigeration system that controls the pump to obtain a circulation amount of the heat medium optimized as described above. The control device includes a first device included in the load-side device, and a second device that controls the entire refrigeration system,
When the difference is larger than the set heat quantity, the first device transmits load-side control information including a temperature detected by the heat medium temperature sensor and a pressure detected by the heat medium pressure sensor to the second device. And request a change in the operating conditions,
The refrigeration system according to claim 1, wherein the second device controls the operation of the compressor and the pump in response to the request. The heat medium temperature sensor is a temperature sensor for detecting the temperature of the heat medium at the inlet and outlet of the load side heat exchanger,
The refrigeration system according to claim 1 or 2, wherein the heat medium pressure sensor is a pressure sensor that detects a pressure at an inlet / outlet of the heat medium of the load side heat exchanger . Further comprising a humidity sensor for detecting the humidity of the air drawn into the fan coil,
The refrigeration system according to any one of claims 1 to 3, wherein the control device further controls the operation of the compressor and the pump by further using the humidity detected by the humidity sensor.   The control device controls the operation of the compressor and the pump using the humidity detected by the humidity sensor, and the heat exchange between the heat medium and air is performed by the fan coil to cool the air and supply it to the room. The refrigeration system according to claim 4, which is performed during cooling.   The control device, based on the pressure detected by the heat medium pressure sensor, in operation in the heat medium circuit, while maintaining the minimum required circulation amount, the outlet water temperature of the load side heat exchanger to the set water temperature. The refrigeration system according to claim 1, wherein the operation of the pump is controlled so as to be maintained.

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