JP2016133225A - Hot water supply system, hot water supply program and hot water supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable efficient and stable hot water supply without increasing the size of a hot water storage tank and being affected by a change in demand for hot water supply.SOLUTION: A hot water supply system includes: a hot water storage tank (tank 10) having a first water outlet (water outflow port 12-3) on the lower layer side and a second water outlet (water outflow port 12-4) on the intermediate layer side and supplying stored hot water from the upper layer side; a first temperature sensor (16-4) for detecting a temperature on the lower layer side of the hot water storage tank; a second temperature sensor (16-1) for detecting a temperature on the upper layer side of the hot water storage tank; first heating means (HP6) of which operation is started on the basis of the temperature of the lower layer side to heat water made to flow out from the first water outlet and return the heated water to the upper layer side of the hot water storage tank; and second heating means (water heater 8) of which operation is started on the basis of the temperature of the upper layer side to heat water made to flow out from the second water outlet and return the heated water to the upper layer side of the hot water storage tank.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hot water supply technique using a plurality of heat source devices such as a heat pump using electricity and a hot water heater using combustion heat of fuel gas.

  2. Description of the Related Art A hybrid hot water supply system that supplies hot water using both a heat pump hot water supply unit that uses an electric heat pump as a heat source and an auxiliary hot water supply unit that uses combustion heat is known.

In this hybrid hot water supply system, a hot water storage tank for storing hot water and supplying hot water is provided with first and second temperature sensors (for example, Patent Document 1). In this system, the hot water temperature in the hot water storage tank in which the hot water distribution is generated is detected at different positions, whereby the on / off control of the auxiliary hot water supply means is performed at the detected temperature of the first temperature sensor, and the detection of the second temperature sensor. The start / stop control of the heat pump hot water supply means is performed by the temperature.

JP 2011-17468 A

  In such a hot water supply system, the capacity of the hot water storage tank differs between home use and business use. For home use, a hot water storage tank for storing hot water of a capacity corresponding to the daily usage, for example, about 350 [liter] is used. It is common to use late-night power for hot water heating. On the other hand, for business use, even if hot water supply demand is enormous and there is a non-use time, the hot water storage tank that stores hot water in advance corresponding to the daily usage amount will be enlarged. Increasing the size of the hot water storage tank increases the installation area and is not practical. If the demand for hot water supply increases, the heating capacity of the heat pump cannot be accommodated, and there is a possibility that the amount of hot water used cannot be satisfied, or hot water supply below the set temperature may be achieved.

  Accordingly, a first object of the present invention is to realize an efficient and stable hot water supply without being affected by an increase in the size of a hot water storage tank or a change in hot water supply demand in view of the above problems.

A second object of the present invention is to realize stabilization and high efficiency of hot water supply in a small hot water storage tank without distinguishing between home use and business use in view of the above problems.

  In order to achieve the above object, according to one aspect of the hot water supply system of the present invention, a hot water storage tank provided with a first water outlet on the lower layer side and a second water outlet on the middle layer side and supplying hot water from the upper layer side, A first temperature sensor for detecting a lower layer side temperature of the hot water storage tank, a second temperature sensor for detecting an upper layer side temperature of the hot water storage tank, and an operation based on the lower layer side temperature, The first heating means that heats the water that flows out from the water outlet of the hot water and returns it to the upper layer side of the hot water storage tank, and the water that starts operation based on the upper layer side temperature and flows out of the second water outlet And a second heating means for returning the water to the upper layer side of the hot water storage tank.

  The hot water supply system may further include a third temperature sensor that detects a middle layer temperature of the hot water storage tank, and the second heating unit may stop operating based on the middle layer temperature.

  In the hot water supply system, the second heating unit may be a heat source device having a heating capability higher than that of the first heating unit.

  In the hot water supply system, any one of the first heating means and the second heating means may be a hot water heater that uses combustion heat of fuel as a heat source.

  In order to achieve the above object, according to one aspect of the hot water supply program of the present invention, there is provided a hot water storage tank provided with a first water outlet on the lower layer side and a second water outlet on the middle layer side and supplying hot water from the upper layer side. A hot water supply program for causing a computer mounted in a hot water supply system to include a first temperature sensor for detecting a lower temperature of the hot water storage tank and a second temperature sensor for detecting an upper temperature of the hot water storage tank The lower temperature is taken in from the first temperature sensor, the upper temperature is taken in from the second temperature sensor, the first heating means is operated based on the lower temperature, and the first temperature sensor is operated. The water flowing out from the water outlet is heated and returned to the upper layer side of the hot water storage tank, the second heating means is operated based on the upper layer side temperature, and the water flowing out from the second water outlet is heated. Said The ability to return to the upper side of the hot water tank is realized on the computer.

In order to achieve the above object, according to one aspect of the hot water supply method of the present invention, there is provided a hot water storage tank provided with a first water outlet on the lower layer side and a second water outlet on the middle layer side to supply hot water from the upper layer side. Installed, detected the lower layer side temperature of the hot water storage tank, detected the upper layer side temperature of the hot water storage tank, operated the first heating means based on the lower layer side temperature, and let it flow out from the first water outlet Water is heated to return to the upper layer side of the hot water storage tank, the second heating means is operated based on the upper layer side temperature, and the water discharged from the second water outlet is heated to upper the upper side of the hot water storage tank The process of returning to is included.

  According to the present invention, any of the following effects can be obtained.

  (1) If the hot water temperature in the hot water storage tank decreases due to the hot water supply demand, the water taken out from the middle layer of the hot water storage tank can be immediately heated to meet the rapidly increasing hot water supply demand.

  (2) The hot water temperature does not fluctuate even if the hot water supply demand changes, and a stable hot water temperature can be realized.

  (3) Since the hot water heating of the hot water storage tank is shared by the first and second heating means, and the complementary heating operation can be performed by the first and second heating means, the heating operation according to the hot water supply demand can be realized, The capacity of the hot water storage tank can be reduced to the required minimum capacity. Such a complementary heating operation by the first and second heating means can avoid an increase in capacity of the hot water storage tank.

  (4) Since the hot water heating of the hot water storage tank is shared by the first and second heating means, the heating capacity of the first and second heating means can be suppressed, and the hot water storage tank and each heating means can be downsized. This can be realized and the hot water supply system can be made compact.

(5) An efficient hot water supply system can be realized by using a heat source device with high heating efficiency as the first heating means and a heat source device with high heating capacity as the second heating means.

It is a figure which shows the hybrid hot-water supply system which concerns on one embodiment. It is a figure which shows the Example of a hot water storage tank. It is a figure which shows the Example of a hybrid hot-water supply system. It is a figure which shows a hybrid hot-water supply control part. It is a figure which shows an example of a hot water supply control part and a heat pump control part. It is a flowchart which shows the process sequence of hot water supply control. It is a flowchart which shows the process sequence of heat pump thermal storage control. It is a flowchart which shows the process sequence of hot water heater heat storage control. It is a figure which shows the operation | movement pattern according to a hot water storage state. It is a figure which shows the other operation | movement pattern according to a hot water storage state.

<Hybrid hot water supply system>

  FIG. 1 shows a hybrid hot water supply system according to an embodiment of the present invention. The configuration shown in FIG. 1 is an example, and the present invention is not limited to such a configuration.

  The hybrid hot-water supply system (hereinafter simply referred to as “hot-water supply system”) 2 includes a tank unit 4, a heat pump (hereinafter referred to as “HP”) 6 as first heating means, and a hot water heater 8 as second heating means. It is.

  The tank unit 4 includes a hot water storage tank (hereinafter simply referred to as “tank”) 10, receives hot water W, supplies hot water HW heated by the HP 6 and the hot water heater 8, and responds to hot water supply demand. Hot water HW is supplied.

  HP 6 causes the lower layer water of the tank 10 to flow out and heats it, and returns it to the upper layer side of the tank 10. On the other hand, the water heater 8 causes the middle layer water of the tank 10 to flow out and heats it, and returns it to the upper layer side of the tank 10.

  In such a configuration, the hot water HW heated by the HP 6 and the hot water heater 8 is stored in the tank 10 to perform hot water supply according to the hot water supply demand. For example, if the HP 6 is operated based on the lower layer side temperature of the tank 10 and the water heater 8 is operated based on the upper layer side temperature of the tank 10, the following operation is possible.

  At all times, the hot water HW in the tank 10 is stored according to the heating capacity of the HP 6. When the hot water supply demand increases and the upper layer side temperature of the hot water HW decreases, the hot water heater 8 is operated, and the temperature of the hot water HW is raised by the heating by the hot water heater 8 to meet the hot water demand. That is, the shortage of the heating capacity of the HP 6 is supplemented by the heating capacity of the water heater 8.

  Further, since there is no demand for hot water supply, a temperature distribution is generated in the hot water stored in the tank 10, and the hot water heater 8 is operated even when the upper layer side temperature is lowered, and the temperature of the hot water HW is increased by heating by the hot water heater 8. Thereby, it is possible to respond quickly to a rapid hot water supply demand that far exceeds the normal hot water supply demand. Also in this case, the shortage of the heating capacity of the HP 6 is supplemented by the heating capacity of the water heater 8.

  By utilizing such a complementary function of the water heater 8, the hot water storage capacity of the tank 10 can be reduced in combination with supplementing the heating capacity of the HP 6. In other words, the shortage of the heating capacity of the HP 6 with respect to the increase and decrease of the hot water supply demand when the hot water storage capacity of the tank 10 is reduced can be buffered by the heating capacity of the water heater 8.

<Tank 10>

  FIG. 2 shows an example of the tank 10. The tank 10 is, for example, a long cylindrical container, and the tank capacity is, for example, about 90 [liter]. This value is an example and is not limited to this value.

  This tank 10 is provided with a tapping port 12-1 at the top on the upper layer side, a water supply port 12-2 at the bottom, a water outflow port 12-3 at the bottom, a water outflow port 12-4 at the middle, and an upper layer. Hot water return ports 12-5 and 12-6 are provided along with the hot water outlet port 12-1.

  The hot water outlet port 12-1 discharges hot water HW from the tank 10 from the upper layer portion of the hot water storage water. In conjunction with this hot water supply, water is supplied to the tank 10. The water supply port 12-2 is an example of a water supply port, and the clean water W is supplied into the tank 10 from the water supply port 12-2. As a result, a predetermined amount of hot water is maintained in the tank 10.

  The water outflow port 12-3 is an example of a first water outflow port, and lower layer water is outflowed from the water outflow port 12-3 and heated by HP6. The warm water HW obtained by the HP 6 is returned to the upper layer portion of the tank 10 through the warm water return port 12-5.

  The water outflow port 12-4 is an example of a second outflow port, and the middle layer water is outflowed from the water outflow port 12-4 and heated by the water heater 8. The hot water HW obtained by the hot water heater 8 is returned to the upper layer of the tank 10 through the hot water return port 12-6.

  In this way, hot water is supplied from the upper layer side of the tank 10 and water is supplied from the lower layer side, and the heated hot water HW is returned to the upper layer side, so that the temperature distribution of the hot water is increased from the lower layer side toward the upper layer side. A hierarchical heat storage area is established. In this embodiment, a nine-layer heat storage region is assumed. Broken lines indicate virtual heat storage regions I, II, III... IX.

  And in this tank 10, the 1st baffle plate 14-1 is arrange | positioned at the lowest layer side, and the 2nd baffle plate 14-2 is arrange | positioned at the uppermost layer side. The baffle plate 14-1 has a curved shape that protrudes upward, and the baffle plate 14-2 has a curved shape that protrudes downward. Therefore, the baffle plate 14-1 prevents turbulence of the tiered heat storage due to the water supply on the heat storage region I side, and the baffle plate 14-2 prevents turbulence of the tiered heat storage on the heat storage region IX side due to hot water return and warm water return. That is, the baffle plates 14-1 and 14-2 are protection means for the tiered heat storage region, and thereby a stable heat storage region is secured in the tank 10.

  In the tank 10, four sets of temperature sensors 16-1, 16-2, 16-3, and 16-4 are arranged as a plurality of temperature sensors. The temperature sensor 16-4 is an example of a first temperature sensor that detects the lower layer side temperature of the hot water storage tank 10, and the temperature sensor 16-1 is an example of a second temperature sensor that detects the upper layer side temperature. The sensor 16-2 is an example of a third temperature sensor that detects the middle layer side temperature.

  The temperature sensor 16-1 measures the heating start temperature of the water heater 8. The temperature sensor 16-1 measures the boundary temperature between the heat storage region VIII and the heat storage region IX that is not affected by the heat of the hot water HW due to the return of hot water from the HP 6 or the water heater 8.

  The temperature sensor 16-2 measures the heating stop temperature of the water heater 8. In this example, the water outflow port 12-4 is arranged at the boundary between the heat storage region VI and the heat storage region VII. In this temperature sensor 16-2, for example, the upper temperature is measured from the boundary between the heat storage region VI and the heat storage region VII as the upper side from the water outflow port 12-4.

  The temperature sensor 16-3 measures the temperature in the heat storage state. In this example, for example, the boundary temperature between the heat storage region IV and the heat storage region V is measured.

  The temperature sensor 16-4 measures the heating start temperature of the HP 6. In this example, the boundary temperature between the heat storage region III and the heat storage region II is measured.

  Since the tank 10 includes the baffle plates 14-1 and 14-2, a certain amount of heat storage is ensured in the heat storage region IX of the upper layer DH in consideration of turbulent hot water due to the return of hot water from the water heater 8. . In the heat storage regions I and II of the lower layer DL, a heat storage state in which the start and stop of the HP 6 is not repeated within a short time is secured. Further, in the heat storage regions VII and VIII of the middle upper layer DM, a heat storage state in which the hot water heater 8 is not repeatedly started and stopped within a short time is ensured.

<Example of hot water storage system 2>

  FIG. 3 shows an embodiment of the hot water storage system 2.

  The tank unit 4 may be provided with a case common to the HP 6 or the water heater 8 or may be provided with a separate case. This housing is provided with a temperature sensor 16-5. This temperature sensor 16-5 detects the outside air temperature.

  A hot water outlet 18-1 is connected to the hot water outlet port 12-1 of the tank 10, and the upper layer water of the tank 10 is supplied from the hot water outlet 18-1 to a hot water demand point. For example, a hot water tap is provided at the demand point, and the hot water is started by opening the hot water tap. The hot water outlet 18-1 is provided with a pressure relief valve 20-1, temperature sensors 16-6 and 16-7, and a mixed water regulating valve 20-2 from the tank 10 side (upstream side) toward the downstream side. . A bypass path 18-3 is branched from the hot water path 18-1, and is connected to the water supply path 18-2.

  The pressure relief valve (vacuum breaker built-in) 20-1 releases the pressurized state of the tank 10 to the outside air through the hot water outlet 18-1, and also functions as a pressure breaking valve. The temperature sensor 16-6 detects the temperature of the tapping water discharged from the tank 10. The temperature sensor 16-7 detects the temperature of the mixed water of the clean water W and the warm water HW from the bypass 18-3. The mixed water regulating valve 20-2 regulates the flow rate of the mixed water to be discharged based on the opening degree.

  A water supply path 18-2 is connected to the water supply port 12-2 of the tank 10, and the tap water W is supplied according to the hot water from the tank 10. In this water supply path 18-2, the temperature sensor 16-8, the pressure reducing valve 20-3, the water supply check valve 20-4, the water amount sensor 22-1, the mixing valve 20- from the upstream side to the downstream side of the clean water W. 5 and a tank check valve 20-6. The temperature sensor 16-8 detects the feed water temperature of the clean water W. The pressure reducing valve 20-3 is used for reducing the water pressure. The water supply check valve 20-4 is an example of an edge cutting means with the water source side of the clean water W. For example, when the water supply upstream side becomes negative pressure at the time of water outage, the hot water storage tank 10 does not become a sudden negative pressure. Function. The water amount sensor 22-1 detects the water flow, hot water supply, or water supply flow rate during hot water supply. The mixing valve 20-5 adjusts the amount of water to flow to the bypass 18-3 side according to the opening. The temperature of the mixed water is adjusted to a predetermined tapping temperature by adjusting the amount of water supplied to the bypass 18-3 side. The tank check valve 20-6 prevents a reverse flow from the tank 10 to the clean water W side.

  A heat pump circulation path (hereinafter simply referred to as “circulation path”) 24 is connected to the water outflow port 12-3 and the hot water return port 12-5 as a first circulation path, and HP 6 is connected thereto. An HP pump 26-1 and a temperature sensor 16-9 are provided on the return pipe 24-1 side of the circulation path 24, and a temperature sensor 16-10 and a heating water switching valve 20-7 are provided on the return pipe 24-2. A bypass path 24-3 is formed in the forward pipe 24-1 and the return pipe 24-2 through the heating water switching valve 20-7. When the hot water stored in the tank 10 is heated, the HP pump 26-1 is driven to cause the lower layer water in the tank 10 to flow out and circulate from the circulation path 24 to the HP 6. The arrows attached to the forward pipe 24-1 and the return pipe 24-2 indicate the circulation direction of the circulating water.

  The temperature sensor 16-9 detects the temperature of the lower layer water that has flowed out of the tank 10. The temperature sensor 16-10 detects the temperature of the hot water HW heated by the HP 6. The heated water switching valve 20-7 causes the warm water HW of the return pipe 24-2 to flow to the warm water return port 12-5 when the stored water in the tank 10 is heated, and when the stored water in the tank 10 is not heated, the return pipe 24- No. 2 hot water HW is switched to the forward pipe 24-1 side.

  A water heater circulation path (hereinafter simply referred to as “circulation path”) 28 is connected to the water outflow port 12-4 and the hot water return port 12-6 as a second circulation path, and the water heater 8 is connected thereto. A hot water supply pump 26-2 is provided on the outgoing pipe 28-1 side of the circulation path 28. When heating the hot water stored in the tank 10, the hot water supply pump 26-2 is driven, and the middle layer water of the tank 10 is caused to flow out and circulate in the hot water supply device 8.

The HP 6 includes an HP circuit 30, an HP heat exchanger 32, and a temperature sensor 16-11. In the HP circuit 30, CO ₂ is circulated as a refrigerant for HP 6. The HP heat exchanger 32 performs heat exchange between the refrigerant circulating in the HP circuit 30 and the circulating water in the circulation path 24 and heats the circulating water with the heat of the refrigerant. The temperature sensor 16-11 detects the temperature of the circulating water after heat exchange. In addition to the HP heat exchanger 32, for example, a CO ₂ refrigerant cycle including an expansion valve, an air heat exchanger, and a compressor is used for the HP circuit 30. In the air heat exchanger, the refrigerant absorbs heat from the atmosphere, and in the compressor, the refrigerant is compressed by electric power.

  The water heater 8 is provided with a heat exchanger 34 for heating the circulating water in the circulation path 28. The heat exchanger 34 exchanges heat between the combustion heat of the burner 36 and the circulating water in the circulation path 28 to heat the circulating water. The burner 36 may be a burner that burns fuel gas, but a burner that uses liquid fuel such as kerosene or solid fuel as the fuel may be used.

  An outgoing pipe 28-1 of the circulation path 28 is connected to the entrance side of the heat exchanger 34, and a return pipe 28-2 is connected to the exit side thereof. By operating the hot water supply pump 26-2, the middle layer water of the tank 10 is circulated to the heat exchanger 34. The arrows attached to the forward pipe 28-1 and the return pipe 28-2 indicate the circulation direction of the circulating water.

  A temperature sensor 16-12, a water amount sensor 22-2, and a mixing valve 20-8 are provided on the outgoing pipe 28-1 side. The temperature sensor 16-12 detects the temperature of the circulating water that enters the heat exchanger 34 from the tank 10. The water amount sensor 22-2 detects the presence / absence of circulating water and the circulating flow rate. The mixing valve 20-8 circulates circulating water from the forward pipe 28-1 to the return pipe 20-2 from the forward pipe 28-1 according to the opening degree. The bypass path 28-3 branches the return pipe 28-2 and is connected to the forward pipe 28-1 via the mixing valve 20-8.

  On the return pipe 28-2 side, a temperature sensor 16-13, a mixed water regulating valve 20-9, and a temperature sensor 16-14 are provided. The temperature sensor 16-13 detects the temperature of the circulating water after heat exchange. The mixed water regulating valve 20-9 regulates the flow rate of circulating water by mixing before and after heat exchange according to the opening degree. The temperature sensor 16-14 detects the temperature of the circulating water on the return pipe 28-2 side, which is mixed water before and after heat exchange.

<Hybrid control unit>

  The hot water supply system 2 includes a hybrid control unit 38. 4 and 5 show an example of the hybrid control unit 38. FIG.

  The hybrid control unit 38 includes a tank control unit 38-1, an HP control unit 38-2, a water heater control unit 38-3, and a remote control unit 38-4. The tank control unit 38-1 is provided in the tank unit 4 and controls each functional unit including the HP pump 26-1 and the hot water supply pump 26-2 of the tank unit 4 based on the detected temperatures of the respective units.

  The HP control unit 38-2 is provided in the HP 6, and controls the functional unit of the HP 6. The water heater control unit 38-3 is provided in the water heater 8, and controls each functional unit including the mixing valve 20-8 based on the temperature detected by each unit. The remote control unit 38-4 is provided in the remote control device 48, and is linked to the tank control unit 38-1, the HP control unit 38-2, and the water heater control unit 38-3, and gives instructions to each control unit and from each control unit. Control information display.

  As shown in FIG. 4, the tank control unit 38-1 is configured by a computer, and includes a processor 40-1, a memory unit 42-1, a system communication unit 44-1, and an input / output unit (I / O) 46-1. It is done. The processor 40-1 executes a program stored in the memory unit 42-1, and performs information processing such as function control of the tank unit 4 and information display. The memory unit 42-1 stores a program and control information obtained by information processing. The memory unit 42-1 may be a recording medium such as a hard disk or a semiconductor memory, and a non-volatile memory may be used as the recording medium. The memory unit 42-1 includes a ROM (Read-Only Memory) and a RAM (Random-Access Memory).

  The system communication unit 44-1 is linked to the HP control unit 38-2, the water heater control unit 38-3 and the remote control unit 38-4 by the communication cable 50 under the control of the processor 40-1. Responsible for sending and receiving. Although the communication cable 50 is illustrated by a single line, actually, the tank control unit 38-1 is communicated with three systems of an HP control unit 38-2, a water heater control unit 38-3, and a remote control unit 38-4. The circuit is configured.

  The I / O 46-1 receives detection signals from a plurality of temperature sensors 16-1, 16-2,. A control output is output from this I / O 46-1 to functional units such as the HP pump 26-1 and the hot water supply pump 26-2.

  As shown in FIG. 5, the HP control unit 38-2 is configured by a computer, and includes a processor 40-2, a memory unit 42-2, a system communication unit 44-2, and an I / O 46-2. The processor 40-2 executes a program stored in the memory unit 42-2, and performs information processing such as function control of the HP 6. The memory unit 42-2 stores a program and control information obtained by information processing. The memory unit 42-2 may be a recording medium such as a hard disk or a semiconductor memory, and a non-volatile memory may be used as the recording medium. The memory unit 42-2 includes a ROM and a RAM.

  The system communication unit 44-2 is linked to the tank control unit 38-1, the water heater control unit 38-3, and the remote control unit 38-4 by the communication cable 50 under the control of the processor 40-2. Responsible for sending and receiving.

  Detection signals are taken into the I / O 46-2 from a plurality of temperature sensors 16-11 and the like. A control output is output from this I / O 46-2 to the functional unit of HP6.

  The water heater control unit 38-3 is configured by a computer, and includes a processor 40-3, a memory unit 42-3, a system communication unit 44-3, and an I / O 46-3. The processor 40-3 executes a program stored in the memory unit 42-3, and performs information processing such as function control of the water heater 8. The memory unit 42-3 stores a program and control information obtained by information processing. The memory unit 42-3 may be a recording medium such as a hard disk or a semiconductor memory, and a non-volatile memory may be used as the recording medium. The memory unit 42-3 includes a ROM and a RAM.

  The system communication unit 44-3 is linked to the tank control unit 38-1, the HP control unit 38-2, and the remote control unit 38-4 by the communication cable 50 under the control of the processor 40-3, and transmits and receives control information between the units. In charge.

  Detection signals are taken into the I / O 46-3 from a plurality of temperature sensors 16-12,. A control output is output from this I / O 46-3 to the functional unit of the water heater 8.

  The remote control unit 38-4 is configured by a computer, and includes a processor 40-4, a memory unit 42-4, a system communication unit 44-4, and an I / O 46-4. The processor 40-4 executes a program stored in the memory unit 42-4 and performs information processing such as function control and display control of the remote control device 48. The memory unit 42-4 stores a program and control information obtained by information processing. The memory unit 42-4 may be a recording medium such as a hard disk or a semiconductor memory, and a non-volatile memory may be used as the recording medium. The memory unit 42-4 includes a ROM and a RAM.

  The system communication unit 44-4 is linked to the tank control unit 38-1, the HP control unit 38-2, and the water heater control unit 38-3 by the communication cable 50 under the control of the processor 40-4. Responsible for sending and receiving.

  An input switch (SW) 52, an operation display unit 54, an LED display 56, and the like are connected to the I / O 46-4. The SW 52 is an example of an operation input unit, and performs power-on, input of a set temperature, and the like. The operation display unit 54 displays input information and control information and warning information received from the tank unit 4, HP 6 or hot water heater 8 received by the remote control device 48. This display is displayed by an image, for example. The LED display 56 performs display functions such as an emergency display and a display indicating that driving is in progress. For example, a touch sensor may be used as the operation display unit 54.

<Processing procedure>

  The control of the hot water supply system 2 includes hot water supply control (FIG. 6), heat storage control of the HP 6 (FIG. 7), and heat storage control of the water heater 8 (FIG. 8).

  FIG. 6 shows a processing procedure for hot water supply control. This processing procedure is an example of processing executed by the hot water supply program and a hot water supply method.

  At the time of hot water supply, the presence or absence of water supply is determined (S101). The presence or absence of this water supply or hot water supply may be performed by detection of the water amount sensor 22-1. This water supply is linked to the hot water supply, and the water is supplied to the tank 10 during the hot water supply. If there is no water supply (NO in S101), the process waits until there is water supply.

  If there is water supply (YES in S101), feed forward (FF) control is executed in the tank unit 4 (S102). In this FF control, the detected temperature of the temperature sensors 16-6 and 16-8 is referred to, and the opening ratio of the mixing valve 20-5 is adjusted according to the hot water supply set temperature. The temperature sensor 16-6 detects the hot water temperature T6 of the hot water HW discharged from the tank 10, and the temperature sensor 16-8 detects the water supply temperature T8 of the clean water W with respect to the tank 10.

  After the start of the FF control, the completion of the operation of the mixing valve 20-5 is waited (S103). In response to the completion of the operation of the mixing valve 20-5, feedback (FB) control is executed (S104). In this FB control, the detected temperature of the temperature sensor 16-7 is referred to, and the opening ratio of the mixing valve 20-5 is adjusted according to the hot water supply set temperature. The temperature sensor 16-7 detects a mixed water temperature T7 of hot water HW and water W discharged from the tank 10.

  The presence or absence of water supply is again determined (S105). If there is water supply (YES in S105), the FB control (S104) is continued and the water supply is continuously determined in order to meet the demand for hot water supply.

  And if water supply is complete | finished (NO of S105), it will return to S101 about completion | finish of hot water supply, and will perform each process of S101-S105 continuously.

  FIG. 7 shows the processing procedure of the heat storage control of HP6. In this processing procedure, an instruction to drive the HP 6 is determined (S201). If there is a drive instruction (YES in S201), it is determined whether the detected temperature T4 of the temperature sensor 16-4 is lower than the lower limit reference temperature TM (T4 <TM) (S202). The lower limit reference temperature TM is a temperature lower by, for example, −3 [° C.] than the temperature at which the HP 6 is overheated, and TM = 45 [° C.] is set.

  If T4 <TM (YES in S202), the heating water switching valve 20-7 is switched to the return (bypass passage 24-3) side, and the rotational speed Nf of the HP pump 26-1 is set to a constant rotational speed. 2000 [rpm] is set, and the HP 6 is activated (S203).

  After the activation of the HP 6, it is determined whether the detected temperature T10 of the temperature sensor 16-10 is equal to or higher than a certain temperature TL (T10 ≧ TL) (S204). In this example, the temperature is lower by, for example, −5 [° C.] as a constant temperature from the temperature at which HP 6 overheats, and TL = 43 [° C.] is set. If T10 ≧ TL is not satisfied (NO in S204), the process returns to S201, and the processes of S201 to S204 are executed.

  If T10 ≧ TL (YES in 204), the heating water switching valve 20-7 is switched to the tank 10 side (S205), and the detected temperature T10 of the temperature sensor 16-10 or the detected temperature T11 of the temperature sensor 16-11 is constant. It is determined whether the temperature is higher than TH (T10 ≧ TH or T11 ≧ TH) (S206). In this case, if the system hot water supply set temperature, which is the temperature of the hot water outlet 18-1, is 60 [° C.] or less as a predetermined temperature, for example, TH = 65 [° C.] is set. = Set system hot water supply temperature +5 [° C]. Any of the temperature sensors 16-10 and 16-11 used for this temperature determination may be used, but if the response of the HP 6 is emphasized, the detected temperature T11 of the temperature sensor 16-11 may be used.

  If T10 ≧ TH or T11 ≧ TH (YES in S206), the rotational speed of the HP pump 26-1 is increased (S207). If T10 ≧ TH or T11 ≧ TH is not satisfied (NO in S206), the rotational speed of the HP pump 26-1 is decreased, and the rotational speed of the HP pump 26-1 is decreased to the minimum rotational speed, for example, 500 [rpm]. (S208).

  After the increase / decrease in the rotation speed of the HP pump 26-1, it is determined whether the detected temperature T9 of the temperature sensor 16-9 is equal to or higher than TM (T9 ≧ TM) (S209). In this case, the temperature is lower by, for example, −3 ° C. than the temperature at which HP 6 overheats, and TM = 45 ° C.

  If T9 ≧ TM (NO in S209), it is determined whether there is an instruction to drive HP6 (S210). If there is a driving instruction for HP6 (YES in S210), the process returns to S206 and the processes of S206 to S210 are continued.

  In S201 and S210, if there is no instruction to drive HP6 (NO in S201, NO in S210), if T4 <TM is not satisfied in S202 (NO in S202), T9 ≧ TM is satisfied in S209 (YES in S209). ), The heating water switching valve 20-7 is switched to the return (bypass path 24-3) side, the HP pump 26-1 is stopped, the HP 6 is stopped (S211), and the process returns to S201.

  FIG. 8 shows a processing procedure for heat storage control of the water heater 8. In this processing procedure, it is determined whether the remote control device 48 is operating (S301). If the remote control device 48 is operating (YES in S301), it is determined whether the detected temperature T1 of the temperature sensor 16-1 is, for example, less than 63 [° C.] (T1 <TS1) as the comparison temperature TS (S302).

  In this case, if the hot water supply set temperature is, for example, 60 [° C.] or less, TS1 = 63 [° C.] is set, and otherwise, the hot water set temperature is set to a constant temperature, for example, +3 [° C.]. The water heater 8 is heated to a predetermined temperature, for example, 10 [° C.] higher than the set temperature of the hot water supply, and the maximum temperature of the water heater 8 is 80 [° C.].

  Therefore, the system hot water supply set temperature is set to 60 [° C.] or less, 65 [° C.], 70 [° C.], or 75 [° C.], for example. In the determination of the detected temperature T1 of the temperature sensor 16-1, if the system hot water supply set temperature is 60 [° C.] or less, TS1 = 63 [° C.], and if the system hot water set temperature is 65 [° C.], TS1 = 68. If [C], the system hot water supply set temperature is 70 [C], TS1 = 73 [C], and if the system hot water set temperature is 75 [C], TS1 = 78 [C].

  If T1 <TS1 (YES in S302), it is determined whether water supply has occurred on the tank 10 side (S303). The presence or absence of tank water supply can be determined based on the detected flow rate of the water amount sensor 22-1 and the distribution ratio of the mixing valve 20-5. If tank water supply is not occurring (NO in S303), the hot water supply pump 26-2 is reduced to a rotational speed that secures the minimum hot water heater combustion flow rate, for example, 3 [liter / min] (S304). Thereby, the operation time of the water heater 8 can be secured, and the combustion amount of the water heater 8 can be suppressed to the minimum combustion amount.

  If water supply has occurred on the tank 10 side (YES in S303), the hot water supply pump 26-2 is controlled to the set rotational speed (S305).

  The set number of rotations of the hot water supply pump 26-2 may be calculated by calculating the amount of water supplied to the tank 10 based on the amount of water detected by the water amount sensor 22-1 and the distribution ratio of the mixing valve 20-5. What is necessary is just to control the rotation speed of the hot water supply pump 26-2 so that it may become the flow volume on the basis of this calculated value. Thereby, the flow volume for hot-water supply use is securable.

  After the process of S304 or S305, it is determined whether the detected temperature T2 of the temperature sensor 16-2 is equal to or higher than the comparison temperature TS2 (T2 ≧ TS2) (S306). In this case, if the system hot water set temperature TH described above is set to, for example, 60 [° C.] or less, 65 [° C.], 70 [° C.], or 75 [° C.], the return pipe 28-2 of the water heater 8 is set. The hot water set temperature is set to TH = 60 [° C.] or less: 70 [° C.], TH = 65 [° C.]: 75 [° C.], TH = 70 or 75 [° C.]: 80 [° C.]. Thereby, in the determination of the detection temperature T2 of the temperature sensor 16-2, if the system hot water supply set temperature is 60 [° C.] or less, TS2 = 63 [° C.], and if the system hot water supply set temperature is 65 [° C.], If TS2 = 68 [° C.], the system hot water supply set temperature is 70 [° C.], TS2 = 73 [° C.], and if the system hot water set temperature is 75 [° C.], TS2 = 78 [° C.] Good. In this embodiment, TS1 = TS2.

  If T2 ≧ TS2 (NO in S306), the process returns to S303, and the processes in S303 to S306 are continued.

  If T2 ≧ TS2 (YES in S306), the hot water supply pump 26-2 is stopped, the process returns to S301, and the process is continued.

<Operation pattern of hot water supply control>

  FIG. 9A shows a case where the hot water stored in the tank 10 is in a high temperature state. All the hot water stored in the tank 10 is maintained in a high temperature state by the heat storage control by the HP 6 and the heat storage control by the hot water heater 8.

  FIG. 9B shows a state in which the hot water stored in the tank 10 has been lowered in temperature as a result of the hot water supply. In FIG. 9B, B1 indicates a high temperature water area, and B2 indicates a low temperature water area. In this case, by driving HP6, the lower layer water is heated by HP6 and the high-temperature water area is expanded.

  FIG. 9C shows a state in which the hot water in the tank 10 is lowered as a result of leaving the high temperature tank 10 shown in FIG. 9A. In C of FIG. 9, C1 is a high temperature water area, C2 is a medium temperature water area, and C3 is a low temperature water area. In this case, the HP 6 and the water heater 8 are driven. The lower layer water is heated by the HP 6, and the middle layer water is heated by the water heater 8, whereby the high temperature water area is expanded.

  FIG. 9D shows a state in which the high-temperature water area is expanded by heating from the state of FIG. 9C. The water heater 8 has a higher heating capacity than the HP 6, and the high-temperature water area by the water heater 8 is rapidly expanded. In D of FIG. 9, D1 is a high temperature water area, D2 is a medium temperature water area, and D3 is a low temperature water area. Since the high temperature water area D1 exceeds the detection area of the temperature sensor 16-2, the heat storage control of the water heater 8 is stopped. From this state, only the heat storage control of the HP 6 is performed.

  FIG. 10A shows a state in which hot water is supplied from the state of FIG. 9A. In this case, in A of FIG. 10, A1 is a high temperature water area, and A2 is a low temperature water area. The temperature sensor 16-4 detects a low-temperature water area, but the HP 6 is in a stopped state. Thereby, the power loss by HP6 can be suppressed.

  FIG. 10B shows a state in which the temperature of the tank 10 is decreasing due to being left from the state shown in FIG. In FIG. 10B, B1 is a high temperature water area, B2 is a medium temperature water area, and B3 is a low temperature water area. In this state, since the medium hot water area has reached the detection area of the temperature sensor 16-2, the heat storage control by the hot water heater 8 is started. That is, HP 6 is stopped and heat storage control only for hot water heater 8 is started.

  C in FIG. 10 shows a state in which the heat storage control by the hot water heater 8 is performed from the state shown in FIG. 10B and the temperature of the tank 10 is increasing. In C of FIG. 10, C1 is a high temperature water area and C2 is a low temperature water area. The middle temperature water area (B2 in FIG. 10B) has been eliminated and has expanded to the high temperature water area C1. Since the low temperature water area C2 is outside the defense range of the water heater 8, heating by the heat storage control of the water heater 8 is not performed.

<Effect of Example>

  According to the above embodiment, the following effects can be obtained.

  (1) If the hot water temperature of the tank 10 decreases due to demand for hot water supply, the lower layer water of the tank 10 is circulated to the HP 6 to heat it, and the high temperature range of the tank 10 can be expanded by the heat storage control of the HP 6. Further, the middle layer water of the tank 10 can be circulated and heated in the hot water heater 8, and the high temperature range of the tank 10 can be expanded by the heat storage control of the hot water heater 8. Thereby, the temperature fall of the tank 10 by hot water supply and water supply can be eliminated, and the hot water supply demand which increases rapidly can be met.

  (2) Since the heating capacity of the HP 6 can be supplemented by the heat storage control of the hot water supply device 8, the hot water temperature does not fluctuate even if the hot water supply demand changes, and a stable hot water temperature can be realized.

  (3) Warm water heating of the tank 10 can be shared by the HP 6 and the water heater 8, and a complementary heating operation can be performed by both. In the water heater 8, the middle layer water is discharged from the tank 10 and heated, so that the heating operation according to the hot water supply demand can be realized, the capacity of the tank 10 can be suppressed to the necessary minimum capacity, and the HP 6 and the water heater 8 are complementary. The large capacity of the tank 10 can be avoided by a simple heating operation.

  (4) Since the hot water heating of the tank 10 is shared by the HP 6 and the water heater 8, the heating capacity of the HP 6 and the water heater 8 can be suppressed, and the tank 10, the HP 6 and the water heater 8 can be reduced in size and capacity. The hot water supply system 2 can be made compact.

  (5) The hot water heater 8 has a higher heating capacity than the HP 6, and the HP 6 has a higher heating efficiency than the hot water heater 8. Therefore, the high efficiency of the hot water system 2 can be realized by complementing these characteristics. .

  (6) In the above embodiment, if the upper layer side temperature of the hot water storage tank 10 suddenly drops due to hot water supply or the upper layer side temperature of the hot water storage tank 10 fluctuates due to the operation of the HP 6 corresponding thereto, this corresponds to the lowering of the upper layer side temperature. Then, the hot water heater 8 is operated to increase the upper layer side temperature of the hot water storage tank 10, thereby realizing a stable hot water supply temperature. In this case, water can be supplied to the hot water storage tank 10 in accordance with the amount of hot water supplied, the insufficient heat amount can be compensated by the HP 6, and the insufficient heating amount of the HP 6 can be compensated by hot water supply by the water heater 8. That is, the amount of heat deficient due to the hot water supply can be compensated by the cooperative operation of the HP 6 and the hot water heater 8, and the hot water supply temperature can be stabilized.

<Other Examples and Effects>

  (1) Regarding the circulation flow rate of the water heater 8:

  In the above embodiment, the operation period of the water heater 8 is controlled by the detected temperature. After the operation is started by the detected temperature, the circulating flow rate of the water heater 8 is operated according to the detected water amount of the water amount sensor 22-1. It is good also as control which complete | finishes.

  (2) About the operating time of the water heater 8:

  In the above embodiment, the operation period of the water heater 8 is controlled by the detected temperature. However, after the operation is started by the detected temperature, the operation time of the water heater 8 is determined by using the timer function of the processor 40-1. It is good also as control which complete | finishes operation | movement according to the circulation time of water.

[Other Embodiments]

  a) In the above embodiment, the single HP 6 and the water heater 8 are used, but a plurality of water heaters may be used in combination. The hot water heater 8 may be a high efficiency hot water heater that recovers the latent heat of the combustion exhaust.

  b) In addition to the HP 6 and the heat source device of the water heater 8 of the above embodiment, a heat exchanger using electric heat may be used in combination.

As described above, the most preferred embodiment of the technology of the present invention has been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the embodiments for carrying out the invention. It goes without saying that such modifications and changes are included in the scope of the present invention.

INDUSTRIAL APPLICABILITY The present invention is useful because it can realize a hot water supply system having a highly efficient and stable hot water supply capability by combining the heating capability of a heat source device such as a heat pump and the heating capability of a heat source device such as a hot water heater.

2 Hybrid hot water supply system 4 Tank 6 Heat pump (HP)
8 Water heater 10 Hot water storage tank (tank)
12-1 Hot water outlet port 12-2 Water supply port 12-3, 12-4 Water outflow port 12-5, 12-6 Warm water return port 14-1 First baffle plate 14-2 Second baffle plate 16-1, 16-2, 16-3, 16-4, 16-5, 16-6, 16-7, 16-8, 16-9, 16-10, 16-11, 16-12, 16-13, 16- DESCRIPTION OF SYMBOLS 14 Temperature sensor 18-1 Hot water supply path 18-2 Water supply path 18-3 Bypass path 20-1 Pressure relief valve 20-2 Mixed water control valve 20-3 Pressure reducing valve 20-4 Water supply check valve 20-5 Mixing valve 20 -6 Tank check valve 20-7 Heating water switching valve 20-8 Mixing valve 20-9 Mixed water regulating valve 22-1 Water quantity sensor 24 Heat pump circulation path (circulation path)
24-1 Outgoing pipe 24-2 Return pipe 24-3 Bypass path 26-1 HP pump 28 Water heater circulation path (circulation path)
28-1 Outward pipe 28-2 Return pipe 28-3 Bypass path 30 HP circuit 32 HP heat exchanger 34 Heat exchanger 36 Burner 38 Hybrid control section 38-1 Tank control section 38-2 HP control section 38-3 Water heater Control unit 38-4 Remote control unit 40-1, 40-2, 40-3 Processor 42-1, 42-2, 42-3 Memory unit 44-1, 44-2, 44-3 System communication unit 46-1 , 46-2, 46-3 Input / output unit (I / O)
48 Remote control device 50 Communication cable 52 Input switch (SW)
54 Operation display 56 LED indicator

Claims (6)

A hot water storage tank provided with a first water outlet on the lower layer side, a second water outlet on the middle layer side, and supplying hot water from the upper layer side;
A first temperature sensor for detecting a lower layer side temperature of the hot water storage tank;
A second temperature sensor for detecting an upper layer side temperature of the hot water storage tank;
A first heating means that starts operation based on the lower layer side temperature, heats the water discharged from the first water outlet, and returns the water to the upper layer side of the hot water storage tank;
A second heating means that starts operation based on the upper layer side temperature, heats the water discharged from the second water outlet and returns the water to the upper layer side of the hot water storage tank;
A hot water supply system comprising: Furthermore, a third temperature sensor for detecting the middle layer temperature of the hot water storage tank;
The hot water supply system according to claim 1, wherein the second heating unit stops operating based on the intermediate layer side temperature.   3. The hot water supply system according to claim 1, wherein the second heating unit is a heat source unit having a heating capability higher than that of the first heating unit.   4. The water heater according to claim 1, wherein one of the first heating unit and the second heating unit is a water heater that uses combustion heat of fuel as a heat source. Hot water system. A first water flow outlet on the lower layer side, a second water flow outlet on the middle layer side, a hot water storage tank for supplying hot water from the upper layer side, a first temperature sensor for detecting a lower layer side temperature of the hot water storage tank, A hot water supply program for causing a computer mounted on a hot water supply system to include a second temperature sensor for detecting an upper layer side temperature of a hot water storage tank,
Taking in the lower layer side temperature from the first temperature sensor,
The upper layer side temperature is taken in from the second temperature sensor,
Operating the first heating means based on the lower layer side temperature, heating the water flowing out from the first water outlet and returning it to the upper layer side of the hot water storage tank;
Operating the second heating means based on the upper layer side temperature, heating the water flowing out from the second water outlet and returning it to the upper layer side of the hot water storage tank;
A hot water supply program for causing the computer to realize a function. A first water outlet on the lower layer side, a second water outlet on the middle layer side, and a hot water storage tank for supplying hot water from the upper layer side,
Detecting the lower temperature of the hot water tank,
Detecting the upper layer side temperature of the hot water storage tank,
Operating the first heating means based on the lower layer side temperature, heating the water flowing out from the first water outlet and returning it to the upper layer side of the hot water storage tank;
Operating the second heating means based on the upper layer side temperature, heating the water flowing out from the second water outlet and returning it to the upper layer side of the hot water storage tank;
The hot water supply method characterized by including a process.

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