JP2014142108A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply system capable of preventing a hot water supply source supplying hot water to a hot water load from being offset to a specific hot water supply source even if the number of simultaneous hot water supply portions increases.SOLUTION: A hot water supply system includes: first hot water supply sources 1a and 1b of a plurality of systems; a header pipe 3; a pressure sensor 6; and a control device 4. Each of the first hot water supply sources 1a and 1b of the plurality of systems includes: a hot water tank 11 storing hot water; and a heat pump 12 heating the hot water in the hot water tank 11. The first hot water supply sources 1a and 1b are connected in parallel to the header pipe 3 through a pipeline L2, the hot water from the first hot water supply sources 1a and 1b of the respective systems is merged together and fed to a hot water supply load side. The pressure sensor 6 measures a pressure of the hot water fed from the header pipe 3 to the hot water supply load side. The control device 4 sequentially actuates the heat pumps 12 of the systems selected in order if a measured value of the pressure sensor 6 is equal to or smaller than a predetermined first threshold V1 depending on use of the hot water by the hot water supply load.

Description

  The present invention relates to a hot water supply system.

  Conventionally, there has been a hot water supply system in which hot water heated by a heat pump type hot water heater is stored in a hot water storage tank, and hot water is supplied from the hot water storage tank to a hot water supply load (see, for example, Patent Document 1).

JP 2011-149651 A

  In the hot water supply system disclosed in Patent Document 1, hot water is supplied from the hot water storage tank to the hot water supply load. However, since the internal pressure of the hot water storage tank is limited to a predetermined upper limit or less, the number of loads that can be supplied with hot water simultaneously. There were restrictions.

  In general households, there are about 3 simultaneous hot water supply locations, but there is a desire to have about 20 simultaneous hot water supply locations in a larger system. In order to increase the number of hot water supply locations, it is conceivable to connect hot water sources including a heat pump type hot water heater and a hot water storage tank in parallel to supply hot water to a hot water supply load. In this case, if the amount of hot water used in the hot water supply load is large, the hot water is evenly supplied from a plurality of hot water sources. On the other hand, when the amount of hot water used in the hot water supply load is small, hot water is supplied from a hot water source with a small pressure loss due to the piping up to the hot water load, and the operating time of the hot water source varies depending on the magnitude of the pressure loss. It has occurred.

  For this reason, there is a problem that the hot water supply source having a smaller pressure loss due to piping up to the hot water supply load has a longer operation time and a shorter life.

  The present invention has been made in view of the above problems, and the object of the present invention is to prevent a hot water supply source for supplying hot water to a hot water supply load from being biased to a specific hot water supply source even when the number of simultaneous hot water supply locations is increased. It is to provide a hot water supply system.

  The hot water supply system of the present invention includes a plurality of first hot water supply sources, a header pipe, a pressure sensor, and a controller. Each of the first hot water supply sources of the plurality of systems includes a hot water storage tank that stores hot water and a heat pump that warms the hot water in the hot water storage tank. The header pipe is connected in parallel with each of a plurality of first hot water sources, and the hot water from the first hot water sources of each system is joined and sent to the hot water load side. The pressure sensor measures the pressure of hot water sent from the header pipe to the hot water supply load side. The controller controls the operation of the heat pump. When the measured value of the pressure sensor falls below a predetermined first threshold value according to the use of hot water in the hot water supply load, the controller sequentially operates the heat pumps of the systems selected in order. Here, the order in which the heat pumps are selected may be a fixed order set in advance, or may be determined based on the numbers generated by generating random numbers.

  In this hot water supply system, the controller has measuring means for measuring the amount of water supplied from the water supply source to the hot water storage tanks of all systems, and when the measured value of the measuring means falls below a predetermined second threshold, the controller selects in order. It is also preferable to sequentially stop the heat pump of the system.

  In this hot water supply system, a combustion type second hot water supply source is connected to the header pipe in parallel with the first hot water source of a plurality of systems, and the measured value of the pressure sensor is measured with the heat pumps of all systems operating. It is also preferable that the controller starts the operation of the second hot water supply source when the first threshold value or less is reached.

  In this hot water supply system, it is also preferable that a measuring means for measuring the amount of water supplied from the water supply source to the hot water storage tanks of all systems is provided, and the controller performs the following control based on the measurement value of the measuring means. When the measurement value of the measurement unit is equal to or lower than the predetermined third threshold value, the controller stops the second hot water supply source, and when the measurement value of the measurement unit is equal to or lower than the predetermined second threshold value lower than the third threshold value, the controller The heat pumps of the systems selected in order are stopped sequentially.

  According to the present invention, a plurality of systems of first hot water sources are connected in parallel to the header pipe, and at a necessary pressure (predetermined pressure equal to or higher than the first threshold) from the plurality of systems of first hot water sources via the header pipe. Hot water can be supplied to the hot water supply load. Therefore, the amount of hot water that can be supplied to the hot water supply load can be increased, and even when the amount of hot water used in the hot water supply load increases due to an increase in the number of hot water supply locations, it becomes difficult for hot water to run out. Further, when the measured value of the pressure sensor becomes equal to or less than the first threshold value, the controller sequentially operates the heat pumps of the systems selected in order, so that the first hot water supply of the other system is the first hot water supply source of the specific system. It is possible to suppress the operation time from protruding beyond the source. Therefore, the operating time can be averaged by a plurality of heat pump type first hot water supply sources, and the life can be extended as a whole.

It is a system configuration figure of the hot-water supply system of this embodiment. (A) is a figure which shows the time change of the pressure inside a header pipe, (b) is a figure which shows the time change of the amount of water supply from a water supply source.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a system configuration diagram of a hot water supply system. The hot water supply system of the present embodiment includes heat pump type first hot water sources 1a and 1b, a combustion type second hot water source 2, a header pipe 3, and a control device 4.

  Since the first hot water sources 1a and 1b having a plurality of systems have the same configuration, the configuration of the first hot water source will be described by taking the first hot water source 1a as an example, and the description of the first hot water source 1b will be omitted. . The first hot water supply source 1 a includes a plurality of (for example, four) hot water storage tanks 11 for storing hot water and a plurality of (for example, four) heat pumps 12 for warming the hot water in the hot water storage tank 11. In the following description, when describing each of the first hot water sources, the first hot water source 1a and the first hot water source 1b are used. When explaining the common to the first hot water sources 1a and 1b, the first hot water source is used. Indicated as Source 1.

  The hot water storage tank 11 is a sealed tank. A pipe L <b> 1 from the water supply source 5 is connected to the lower part of the hot water storage tank 11, and a pipe L <b> 2 to the header pipe 3 is connected to the upper part of the hot water storage tank 11.

  An electric valve 13 is connected in the middle of the pipe L <b> 2, and the electric valve 13 is opened and closed by the control device 4. When the motor-operated valve 13 is opened by the control device 4, hot water is sent from the hot water storage tank 11 to the header pipe 3 via the pipe L <b> 2 due to the water supply pressure from the water supply source 5. Further, the hot water storage tank 11 is filled with water from the water supply source 5 through the pipe L1, so that the hot water storage tank 11 is filled with hot water.

  When the controller (not shown) of the heat pump 12 detects the flow of hot water from the hot water storage tank 11 to the header pipe 3 with a flow rate sensor (not shown), it starts the operation of heating the hot water stored in the hot water storage tank 11. To do. Since the heat pump 12 is well known in the art, the description thereof is omitted.

  As described above, the hot water in the hot water storage tank 11 is warmed by the heat pump 12, and the temperature distribution of the hot water stored in the hot water storage tank 11 is lower at the lower side and higher at the upper side. Further, a temperature sensor 14 for measuring the hot water temperature is provided in the pipe line from the hot water storage tank 11 to the electric valve 13.

  In this embodiment, each of the two first hot water sources 1a and 1b is composed of four hot water storage tanks 11 and four heat pumps 12. However, the number of simultaneous hot water supply points, the instantaneous hot water supply amount, It can be changed as appropriate according to the required specifications such as the height difference of the location. In this embodiment, the heat pump type hot water supply sources 1a and 1b are provided with two systems. However, the number of hot water supply sources is adjusted according to required specifications such as the number of simultaneous hot water supply points, the amount of instantaneous hot water supply, and the height difference of the hot water supply points. Changes can be made as appropriate.

  The second hot water source 2 is a combustion type hot water source that warms water with the heat of combustion caused by the combustion of fuel. In the present embodiment, the second hot water supply source 2 includes a gas water heater 21, and water is supplied to the gas water heater 21 from the water supply source 5 through the pipe L <b> 3. Hot water heated by the gas water heater 21 is sent to the header pipe 3 via the pipe L4. A pressure reducing valve 23 is connected in the middle of the pipe L3, and the pressure of the hot water discharged from the second hot water source 2 and the first hot water source are reduced by the pressure reducing valve 23 reducing the pressure of the water supply from the water source 5. The pressures of hot water discharged from 1a and 1b are set to the same level. In addition, an electric valve 22 is connected in the middle of the pipe L4, and the electric valve 22 is opened and closed by the control device 4. When the motor-operated valve 22 is opened by the control device 4, water flows from the water supply source 5 through the path of the pipe L3 → the gas water heater 21 → the pipe L4 due to the feed water pressure. A controller (not shown) of the gas water heater 21 monitors the flow rate passing through the gas water heater 21, and when the flow rate exceeds a predetermined set value, heats the water flowing in via the pipe L3, Hot water is supplied to the header pipe 3 through the pipe L4.

  A plurality of systems of first hot water sources 1a and 1b are connected to the header pipe 3 in parallel via pipes L2 (branch pipes), respectively. In addition, a pipe L4 from the second hot water supply source 2 is connected to the header pipe 3 in parallel with the multiple systems of the first hot water supply sources 1a and 1b. Here, the header pipe 3 is connected to the pipe L2 from the first hot water supply sources 1a and 1b so that the hot water flows evenly from the multiple hot water supply sources 1a and 1b and the second hot water supply source 2 into the header pipe 3. The pipe diameter is set to be larger than the pipe L4 from the second hot water supply source 2. A pipe L5 to which a hot water supply load (not shown) is connected is connected to the header pipe 3, and the hot water merged in the header pipe 3 is sent to the hot water supply load via the pipe L5.

  Here, examples of the hot water supply load include a water supply hot water tap installed in a kitchen, a washroom, a bathroom, and the like, and a dishwasher connected to the water supply hot water tap. A return pipe L6 from the hot water supply load side is connected to the header pipe 3. A circulation pump 8 and a heating device 9 are connected in the middle of the return pipe L6. Hot water that has not been consumed by the hot water supply load is sent to the heating device 9 by the circulation pump 8, and then is heated to a predetermined temperature by the heating device 9. And then returned to the header tube 3.

  The control device 4 has a measurement value of a pressure sensor 6 that measures the pressure of hot water inside the header pipe 3 and a measurement value of a water meter 7 that measures the amount of water supplied from the water supply source 5 (water supply amount). Have been entered.

  Based on the measured value of the pressure sensor 6 and the measured value of the water meter 7, the control device 4 includes the electric valve 13 provided in each of the first hot water supply sources 1 a and 1 b and the electric valve 22 provided in the second hot water supply source 2. Controls opening and closing. The pressure sensor 6 measures the pressure of the hot water inside the header pipe 3, but may measure the pressure of the hot water in the pipe L <b> 5 connected to the header pipe 3.

  Here, when the control device 4 opens the motor-operated valve 13, hot water flows from the hot water storage tank 11 to the header pipe 3, so that the controller of the heat pump 12 starts a boiling operation based on the detection result of the flow sensor as described above. To do. On the other hand, when the control device 4 closes the motor-operated valve 13, hot water does not flow from the hot water storage tank 11 to the header pipe 3, so the controller of the heat pump 12 stops the boiling operation based on the detection result of the flow sensor. Thus, the control device 4 controls the operation of the heat pump 12 by controlling the opening and closing of the motor-operated valve 13 that sends hot water from the hot water storage tank 11 to the header pipe 3. The control device 4 controls the operation of the heat pump 12 by controlling the opening and closing of the electric valve 13, but the operation of the heat pump 12 may be controlled by other methods. For example, the control device 4 may directly control the operation of the heat pump 12 by outputting a control signal to the controller of the heat pump 12.

  The operation of this system will be described below with reference to FIG. 2A is a diagram showing the time change of the pressure measured by the pressure sensor 6, and FIG. 2B is a diagram showing the time change of the water supply amount measured by the water meter 7.

  In the state where hot water is not used in the hot water supply load, the pressure inside the header pipe 3 becomes substantially the same as the set pressure of hot water supplied from the first hot water supply sources 1a and 1b and the second hot water supply source 2, respectively. The control device 4 sets the first threshold value P1 to a pressure lower than the above set pressure. If the measured value of the pressure sensor 6 exceeds the first threshold value P1, all the motor-operated valves 13 and 22 are closed, All of the heat pump 12 and the gas water heater 21 of the first hot water source 1a, 1b are stopped.

  On the other hand, when hot water is used in a hot water supply load, the pressure of the hot water inside the header pipe 3 is reduced. When the measured value of the pressure sensor 6 becomes equal to or less than the first threshold value P1 (time t1 in FIG. 2), the control device 4 first stops the last hot water source of the two systems of the first hot water sources 1a and 1b. 1 motor valve 13 is opened, and heat pump 12 of first hot water supply source 1 that was stopped last time is operated. For example, if the first hot water source 1 that was stopped last time is the first hot water source 1a, the control device 4 opens the electric valve 13 of the first hot water source 1a this time, and the heat pump of the first hot water source 1a. 12 is activated first. When the electric valve 13 of the first hot water supply source 1a is opened, hot water is sent from the hot water storage tank 11 of the first hot water supply source 1a to the header pipe 3 via the pipe L2, and from the header pipe 3 to the hot water supply load via the pipe L5. Hot water is supplied. At this time, hot water is supplied from the hot water storage tank 11 of the first hot water supply source 1a to the header pipe 3, whereby the pressure of the hot water inside the header pipe 3 rises, and the measured value of the pressure sensor 6 exceeds the first threshold value P1. . If the hot water supply capacity of the first hot water supply source 1a exceeds the amount of hot water used by the hot water supply load, the pressure of the hot water inside the header pipe 3 is maintained at a predetermined set pressure.

  Thereafter, the amount of hot water used in the hot water supply load increases due to an increase in the number of hot water supply locations for simultaneous hot water supply, and the pressure in the header pipe 3 decreases when the hot water supply capability is insufficient with only the first hot water supply source 1a of one system. When the measured value of the pressure sensor 6 becomes equal to or less than the first threshold value P1 (time t2 in FIG. 2), the control device 4 opens the motor-operated valve 13 of the stopped first hot water supply source 1b and the first hot water supply source 1b. The heat pump 12 is operated. Thereby, hot water is supplied to the hot water supply load from both of the first hot water supply sources 1a and 1b. At this time, when hot water is supplied to the header pipe 3 from the hot water storage tank 11 of the first hot water supply source 1a and the hot water storage tank 11 of the first hot water supply source 1b, the pressure of the hot water inside the header pipe 3 rises, and the pressure sensor The measured value of 6 exceeds the first threshold value P1. If the hot water supply capacity of the first hot water supply sources 1a and 1b exceeds the amount of hot water used by the hot water supply load, the hot water pressure in the header pipe 3 is maintained at a predetermined set pressure.

  After that, the amount of hot water used in the hot water supply load is further increased by increasing the number of hot water supply locations for simultaneous hot water supply. If the hot water supply capacity is insufficient with only the heat pump type first hot water source 1a, 1b, the pressure inside the header pipe 3 is increased. Decreases. And when the measured value of the pressure sensor 6 becomes below 1st threshold value P1 (time t3 of FIG. 2), the control apparatus 4 will open the motor operated valve 22, and will operate the gas water heater 21. FIG. Thus, hot water is supplied to the hot water supply load from the two heat pump type first hot water supply sources 1a and 1b and the combustion type second hot water supply source 2. Then, hot water is supplied to the header pipe 3 from the hot water storage tank 11 of the first hot water supply source 1a, the hot water storage tank 11 of the first hot water supply source 1b, and the gas hot water supply 21, thereby increasing the pressure inside the header pipe 3. The measured value of the pressure sensor 6 exceeds the first threshold value P1. Here, if the total hot water supply capacity of the first hot water supply sources 1a and 1b and the second hot water supply source 2 exceeds the amount of hot water used by the hot water supply load, the pressure of the hot water in the header pipe 3 becomes a predetermined set pressure. Maintained.

  On the other hand, when the amount of hot water used in the hot water supply load decreases due to a decrease in the number of hot water supply points for simultaneous hot water supply, the pressure of the hot water inside the header pipe 3 does not change. It cannot be detected that the amount of hot water used in the load has decreased. Therefore, the control device 4 obtains the amount of hot water used in the hot water supply load based on the amount of water supplied by the water meter 7. When the control device 4 determines that the amount of water used in the hot water supply load is equal to or less than the predetermined threshold value V1 based on the measured value of the water meter 7 (time t4 in FIG. 2), the motor-operated valve 22 is first closed. Then, the gas water heater 21 is stopped.

  Thereafter, when the amount of hot water used in the hot water supply load is further reduced due to a decrease in the number of hot water supply locations for simultaneous hot water supply, the measured value of the water supply amount measured by the water dispenser 7 is decreased along with the decrease in the amount of hot water used in the hot water supply load. descend. When the measured value of the water meter 7 becomes equal to or lower than the predetermined second threshold value V2 (time t5 in FIG. 3), the control device 4 is operated first among the two systems of the first hot water supply sources 1a and 1b. The electric valve 13 of the first hot water source 1a is closed, and the heat pump 12 of the first hot water source 1a is stopped.

  In addition, when the amount of hot water used in the hot water supply load is further reduced due to a decrease in the number of hot water supply locations for simultaneous hot water supply, the measurement result of the water meter 7 is lowered as the amount of hot water used in the hot water supply load is reduced. When the measured value of the water meter 7 becomes equal to or lower than the predetermined second threshold value V3 (time t6 in FIG. 3), the control device 4 closes the electric valve 13 of the first hot water supply source 1b in operation, The heat pump 12 of the hot water supply source 1b is stopped.

  When the first hot water source 1a, 1b is activated when the hot water is used in the hot water supply load next time, the control device 4 operates the first hot water source 1b, which was stopped last time, first. Of the first hot water sources 1a and 1b in the system, the first hot water sources 1a and 1b to be operated first can be sequentially changed.

  As described above, the hot water supply system of the present embodiment includes a plurality of systems of the first hot water supply sources 1a and 1b, the header pipe 3, the pressure sensor 6, and the control device 4 (controller). Each of the first hot water sources 1a and 1b having a plurality of systems includes a hot water storage tank 11 for storing hot water and a heat pump 12 for heating the hot water in the hot water storage tank 11. The header pipe 3 is connected in parallel to each of a plurality of first hot water sources 1a, 1b via a pipe L2, and the hot water from the first hot water sources 1a, 1b of each system is joined to the header pipe 3. It is sent to the hot water supply load side. The pressure sensor 6 measures the pressure of hot water sent from the header pipe 3 to the hot water supply load side. The control device 4 controls the operation of the heat pump 12 provided in the first hot water supply sources 1a and 1b of each system. When the measured value of the pressure sensor 6 falls below a predetermined first threshold value V1 in accordance with the use of hot water in the hot water supply load, the control device 4 sequentially operates the heat pumps 12 of the systems selected in order.

  Thus, in the hot water supply system of this embodiment, since the multiple hot water supply sources 1a and 1b are connected in parallel to the header pipe 3, the header pipe 3 is connected to the multiple hot water supply sources 1a and 1b. Hot water can be supplied to the hot water supply load at a necessary pressure (a predetermined pressure equal to or higher than the first threshold value). Accordingly, the amount of hot water that can be supplied to the hot water supply load can be increased, and even when the amount of hot water used in the hot water supply load increases, it becomes difficult for hot water to run out. Further, when the first hot water supply sources 1a and 1b of a plurality of systems are connected in parallel to the header pipe 3, the pressure loss differs depending on the distance (pipe length) from the first hot water supply source 1 to the hot water supply load. It becomes easy to supply hot water from the 1st hot water supply source 1 with less. Therefore, the operation time of the specific 1st hot water supply source 1 may become long, and the lifetime may be shortened. In the present embodiment, when the measured value of the pressure sensor 6 becomes equal to or less than the first threshold value P1 according to the use of hot water in the hot water supply load, the control device 4 sequentially operates the heat pumps 12 of the systems selected in order. The hot water supply source for supplying hot water to the hot water supply load is less likely to be biased toward the first hot water supply source 1 of a specific system. Therefore, the operation time can be averaged by a plurality of heat pump type first hot water supply sources 1a, 1b, and the life of the hot water supply system as a whole can be extended.

  In the present embodiment, the heat pump type first hot water supply source 1 has only two systems, but three or more heat pump type first hot water supply sources 1 may be provided. In that case, the controller sets in advance the order in which the first hot water supply source 1 having a plurality of systems is operated, shifts the order one by one each time, and sequentially changes the first hot water supply source 1 to be operated first. The operation time of the first hot water supply source 1 having a plurality of systems can be averaged. For example, when there are four heat pump type first hot water sources 1 (referred to as the first hot water source 1a, the first hot water source 1b, the first hot water source 1c, and the first hot water source 1d), If the order in which the hot water source 1 is operated is the first hot water source 1a → the first hot water source 1b → the first hot water source 1c → the first hot water source 1d, this time, the operating order is shifted one by one. Each first hot water source 1 is operated in the order of hot water source 1b → first hot water source 1c → first hot water source 1d → first hot water source 1a. Here, the order in which the control device 4 (controller) sequentially operates the first hot water supply sources 1 having a plurality of systems is not limited to a fixed order set in advance, and for example, based on numbers generated by generating random numbers. In addition, the system or machine number of the first hot water supply source 1 to be operated next may be determined.

  Moreover, the control apparatus 4 (controller) makes the order which stops the 1st hot water supply source 1 which has multiple systems the same as the order which operates the 1st hot water supply source 1 which has multiple systems. Thereby, the operation time of the 1st hot-water supply source 1 which has multiple systems can be averaged by shifting the order which stops the 1st hot-water supply source 1 which has multiple systems one each time.

  Moreover, the hot water supply system of the present embodiment includes a water meter 7 (measuring means) that measures the amount of water supplied from the water supply source 5 to the hot water storage tank 11 provided in the first hot water supply source 1 of all systems. . And if the measured value of the water meter 7 becomes below a predetermined 2nd threshold value (above threshold value V2, threshold value V3), the control apparatus 4 (controller) will stop the heat pump 12 of the system | strain selected in order sequentially. .

  Accordingly, when the amount of hot water used in the hot water supply load is reduced, the heat pumps 12 of the first hot water supply sources 1a and 1b are sequentially stopped. The life of one hot water source 1 can be extended.

  In addition, the hot water supply system of the present embodiment includes a combustion-type second hot water supply source 2 connected in parallel to the header pipe 3 in a plurality of systems of the first hot water supply sources 1a and 1b. And when the measured value of the pressure sensor 6 becomes below 1st threshold value P1 in the state which is operating the heat pump 12 of all the systems, the control apparatus 4 (controller) has started operation | movement of the 2nd hot-water supply source 2. .

  As a result, when the amount of hot water supply is insufficient with the heat pump type first hot water supply source 1a, 1b, the hot water supply amount can be backed up with the combustion type second hot water supply source 2, and hot water shortage is less likely to occur. Further, since the operation of the second hot water supply source 2 is not started until the amount of hot water supply is insufficient in the heat pump type first hot water supply source 1a, 1b, the second hot water supply having a higher operating cost than the heat pump type first hot water supply source 1. The running cost can be reduced by making the source 2 not move as much as possible.

  Moreover, in this embodiment, when the measured value of the water meter 7 (measuring means) becomes equal to or lower than a predetermined third threshold value (the above threshold value V1), the control device 4 (controller) stops the second hot water supply source, When the measured value of the vessel 7 becomes equal to or lower than a predetermined second threshold (the above thresholds V2 and V3) lower than the third threshold, the control device 4 sequentially stops the heat pumps 12 of the systems selected in order.

  As described above, when the amount of hot water used is reduced due to the hot water supply load, the second hot water source is first stopped, so that the operation time of the second hot water source, which is higher in operating cost than the first hot water source, can be shortened as much as possible. The running cost of the hot water supply system can be reduced.

  In the present embodiment, the gas water heater 21 is illustrated as the second hot water supply source 2, but a combustion type hot water source that heats water with heat when a fuel other than gas (for example, oil) is burned may be used. Needless to say.

1a, 1b 1st hot water source 2 2nd hot water source 3 Header pipe 4 Control device (controller)
6 Pressure sensor 11 Hot water storage tank 12 Heat pump L2 Piping V1 First threshold

Claims (4)

A plurality of first hot water sources each having a hot water storage tank for storing hot water and a heat pump for heating the hot water in the hot water storage tank;
Each of the first hot water supply sources of a plurality of systems are connected in parallel, and the header pipe that joins the hot water from the first hot water supply source of each system and sends it to the hot water supply load side,
A pressure sensor for measuring the pressure of hot water sent from the header pipe to the hot water supply load side;
A controller for controlling the operation of the heat pump,
When the measured value of the pressure sensor falls below a predetermined first threshold according to the use of hot water in the hot water supply load, the controller sequentially operates the heat pumps of the systems selected in order. system. Measuring means for measuring the amount of water supplied from the water supply source to the hot water storage tanks of all systems,
2. The hot water supply system according to claim 1, wherein when the measured value of the measuring unit becomes equal to or less than a predetermined second threshold value, the controller sequentially stops the heat pumps of the systems selected in order. Combustion-type second hot water source connected in parallel to the first hot water source of multiple systems with respect to the header pipe,
The controller starts the operation of the second hot water supply source when the measured value of the pressure sensor becomes the first threshold value or less in a state where the heat pumps of all systems are operating. Or the hot-water supply system in any one of 2. Measuring means for measuring the amount of water supplied from the water supply source to the hot water storage tanks of all systems,
When the measured value of the measuring means is equal to or lower than a predetermined third threshold, the controller stops the second hot water supply source,
4. The controller according to claim 3, wherein the controller sequentially stops the heat pumps of the systems selected in order when a measurement value of the measuring unit becomes equal to or lower than a predetermined second threshold value lower than the third threshold value. Hot water system.

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