JP6636390B2 - Hot water supply system and hot water supply control program - Google Patents

Description

The present invention relates to a hot water supply technology for supplying hot water using a plurality of heat source devices, such as a heat pump and a hot water supply device for heating hot water by the combustion heat of fuel gas.

  There is known a hybrid hot water supply system for supplying hot water by using a heat pump hot water supply means using an electric heat pump as a heat source and an auxiliary hot water supply means using combustion heat.

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, by detecting the hot water temperature in the hot water storage tank at which the hot water distribution occurs at different positions, the start / stop 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 is performed. The start / stop control of the heat pump hot water supply means is performed at the temperature.

JP 2011-17468 A

  By the way, the heat source device for heating the hot water in the tank may be newly installed when the hot water supply system is introduced, for example, or may be a heat source device already installed at the installation destination of the hot water supply system. In the hot water supply system, it is preferable to set the hot water storage tank and the water heater close to each other, for example, in order to improve the responsiveness of the hot water supply and to prevent the temperature of the hot water from dropping during hot water supply.

  However, in order to bring the tank and the heat source device close to each other, it is necessary to secure a wide space for disposing the hot water supply system. In addition, when an existing heat source unit is used, a newly installed tank or heat pump must be arranged near the water heater. There is a problem that such a condition hinders introduction of a hot water supply system.

  In a hot water supply system, it is important whether or not the amount of hot water in the tank is sufficient for the hot water supply request. When the tank and the heat source device are set apart from each other, there is a possibility that the hot water in the tank may be used up before the hot water heated by the heat source device reaches the tank. Further, since the pipe from the heat source unit to the tank is long, hot water having a capacity corresponding to the length of the pipe stays between the outlet side of the heat source unit and the inlet side of the tank. When there is a hot water supply request to the heat source unit, the accumulated hot water does not pass through the heat source unit and flows into the upper layer of the hot water storage tank in a large amount without being heated to the set temperature. Such inflow of unheated hot water may affect the temperature of hot water from the tank. The drop in temperature during hot water supply gives the user discomfort and reduces the reliability of the hot water supply system.

Therefore, an object of the present invention is to stably continue a hot water supply process irrespective of an installation distance between an auxiliary heat source and a hot water storage tank in view of the above-described problem.

In order to achieve the above object, one aspect of the hot water supply system of the present invention is a hot water supply system for supplying hot water using a plurality of heat source devices in combination, wherein a tank for storing hot water and a lower layer of hot water or water in the tank are heated. A first heat source device, a second heat source device for heating middle water in the tank to supply hot water to an upper layer side of the tank, and a second heat source for taking in hot water in the tank. A heating pipe including a return pipe for flowing hot water heated by the second heat source unit to the tank, a heating pipe including a return pipe for flowing hot water heated by the second heat source device to the tank, and a communication between the return pipe and the flow pipe; A bypass pipe for circulating hot water heated by the second heat source device in the heating pipe, and a flow destination of the hot water heated by the second heat source device to the tank side or the bypass pipe. Switching means for switching to any of the roadside, and the return A first temperature sensor for detecting a hot water temperature, a second temperature sensor installed at a predetermined height in the tank, the temperature detected by the first temperature sensor is less than the first temperature and wherein when the detected temperature of the second temperature sensor is less than the second temperature, switching the switching means to said bypass pipe roadside, Rutotomoni timer to preheat the hot water of the heating conduit in the second heat source unit Is started, a timer value is read out when the temperature detected by the first temperature sensor becomes equal to or higher than the first temperature after the start of the preheating, and the first temperature is read when the timer value is shorter than a predetermined time. Even if the detected temperature of the sensor is lower than the first temperature and the detected temperature of the second temperature sensor is lower than the second temperature, the setting is changed so that the preheating is not performed, and the timer value is set to a predetermined time. Be long While maintaining the setting of the preheating, and a control unit wherein Ru to end the pre-heating.

In the hot water supply system, further comprising a pumping means for pumping hot water before Symbol heating conduit, wherein, when the detected temperature of the second temperature sensor is lower than said second temperature, said pumping The means may be operated to execute the preheating.

In the above hot water supply system, the control unit may switch the switching unit to the tank when the temperature detected by the first temperature sensor is equal to or higher than the first temperature.

In order to achieve the above object, one aspect of the hot water supply system of the present invention is a hot water supply system for supplying hot water by using a plurality of heat source devices in combination, wherein a tank for storing hot water and a lower layer of hot water or water in the tank are heated. A first heat source device, a second heat source device for heating middle water in the tank to supply hot water to an upper layer side of the tank, and a second heat source for taking in hot water in the tank. A heating pipe including a return pipe for flowing hot water heated by the second heat source device to the tank, a heating pipe including a return pipe for flowing the hot water heated by the second heat source device to the tank, and a communication between the return pipe and the flow pipe; A bypass pipe for circulating hot water heated by the second heat source device in the heating pipe, and a flow destination of the hot water heated by the second heat source device to the tank side or the bypass pipe. Switching means for switching to any of the roadside, and the return A first temperature sensor for detecting a hot water temperature,
In the tank, a third temperature sensor installed at a position higher than the second temperature sensor installed at a predetermined height in the tank to monitor the temperature of hot water ,
When the detected temperature of the first temperature sensor is lower than a predetermined temperature, the switching unit is switched to the bypass pipe side, and the hot water in the heating pipe is preheated by the second heat source unit, and the third heat source is heated . If less than the reference temperature detected by the temperature sensor is set temperature, and a control unit Ru to start supplying hot water heated by the second heat source unit from the heating conduit.

  In the above hot water supply system, further, information indicating the volume from the installation height of the third temperature sensor to the level of the hot water stored in the tank, or the volume of hot water required for flowing the hot water at a predetermined flow rate. A storage unit that stores reference time information, and a timer that measures the time that hot water flows in the return pipe, the control unit controls the elapsed time until the hot water in the return pipe reaches the tank measured by the timer And the reference time information stored in the storage unit, and whether or not to perform the preheating may be determined based on the comparison result.

In order to achieve the above object, one aspect of the hot water supply control program of the present invention is a hot water supply comprising a tank for storing hot water, and a first heat source device and a second heat source device for heating hot water or water in the tank. A hot water supply program to be executed by a computer mounted on the system, wherein the temperature of hot water in a return pipe of a heating pipe through which hot water heated by the second heat source device flows into the tank is taken from a first temperature sensor, The detection temperature of a second temperature sensor installed at a predetermined height in the tank is taken in, and the detection temperature of the first temperature sensor is lower than the first temperature and the detection temperature of the second temperature sensor is If the temperature is lower than the second temperature, the switching means is switched to a bypass pipe side for communicating the return pipe with the outgoing pipe of the heating pipe, and hot water circulating in the heating pipe is reserved by the second heat source unit. Let it heat The timer is started with the the detected temperature of the first temperature sensor from the start of preheating is equal to or greater than the first temperature reading the timer value, the first if the timer value is shorter than the predetermined time If the detected temperature of the temperature sensor is lower than the first temperature and the detected temperature of the second temperature sensor is lower than the second temperature, the setting is changed so that the preliminary heating is not performed, and the timer value is set to a predetermined value. If it is longer than the time, the setting of the preheating is maintained, and the function of terminating the preheating is realized by the computer.

In the hot water supply control program, when the detection temperature before Symbol second temperature sensor is lower than said second temperature, to operate the pumping means for pumping hot water of the heating conduit, to execute the pre-heating function May be included.

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

  (1) Hot water can be supplied at the required temperature without draining the high-temperature water to the upper layer of the tank, and the convenience of the hot water supply system is improved.

  (2) High-temperature hot water can be supplied from the heat source device regardless of the arrangement distance between the tank and the heat source device, and the degree of freedom of installation of the hot water supply system including the first heat source device, the tank, and the second heat source device is increased.

  (3) Before receiving the hot water supply instruction to the heat source unit, the hot water in the pipeline between the heat source unit and the tank is pre-heated to prevent the temperature of the hot water in the tank from dropping, and the hot water supply by the heat source unit Responsiveness can be improved.

Other objects, features and advantages of the present invention will become more apparent by referring to the accompanying drawings and each embodiment.

It is a figure showing the example of composition of the hot water supply system concerning one embodiment. It is a flowchart which shows an example of hot-water supply control by a hot-water supply system. It is a figure showing an example of a hot water supply system. It is a figure showing the example of composition of a tank. It is a figure which shows the preliminary heating process with respect to the hot water in a pipeline. It is a figure showing the example of composition of a tank control part. FIG. 3 is a diagram illustrating a configuration example of a control unit. It is a flowchart which shows an example of the preliminary heating process by a water heater. 9 is a flowchart illustrating an example of water heater control according to the second embodiment. It is a flowchart which shows an example of water heater control in a normal mode. It is a flowchart which shows an example of water heater control in an energy saving mode. It is a flowchart which shows an example of the water heater control in an off mode. It is a flowchart which shows an example of a hot-water supply process. It is a flow chart which shows an example of operation control processing of a heat pump.

  [One embodiment]

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

  The hot water supply system 2 includes a tank unit 4, a first heat source unit 6, and a second heat source unit 8. Hot water heated by these heat source units 6, 8 is stored in the tank unit 4, and the hot water is supplied to the hot water supply load side. This is an example of a so-called hybrid hot water supply system. The hot water supply system 2 includes a control unit 10 that controls, for example, the state of heat storage in the tank unit 4 and the operation of the heat source units 6 and 8.

  The tank unit 4 includes a hot water storage tank (hereinafter, simply referred to as a “tank”) 12, and is supplied with clean water W, and is filled with high-temperature hot water HW, hot water MW, and low-temperature hot water CW. In the tank unit 4, tap water W or low-temperature hot / cold water CW flows toward the first heat source device 6, and stores the hot water HW heated by the heat generated by the first heat source device 6. Further, the tank unit 4 takes in the hot water heated by the second heat source device 8 in accordance with the amount of stored hot water or a hot water supply request. As described above, the tank unit 4 stores the hot water HW using the plurality of heat source devices 6 and 8 in combination, and supplies the hot water HW according to the hot water supply demand.

  The tank 12 is supplied with, for example, tap water W on the lower layer side. Then, the tank 12 is heated by the heat source devices 6 and 8 to cool the high temperature water W, the lower level water CW and the middle level water MW, and takes in the high temperature hot water HW from the upper side. Thus, in the tank 12, the temperature of the hot and cold water decreases from a high temperature to a low temperature from the upper layer side to the lower layer side.

  The first heat source unit 6 is an example of a heating unit that takes in low-temperature clean water W or low-temperature hot and cold water CW on the lower layer side of the tank 12 and heats it. The first heat source device 6 is a main heating means for heating processing according to the state of hot water in the tank 12 or for heating water W in response to a hot water supply request.

  The second heat source unit 8 is an example of an auxiliary heating unit of the hot water supply system 2, and is a heating unit that takes in hot water MW in the middle layer of the tank 12, heats it, and supplies it to the upper layer of the tank 12. The second heat source device 8 operates, for example, for additional heating of hot water in response to a hot water supply request, or for hot water when the first heat source device 6 is not operating.

  In the hot water supply system 2, for example, the first heat source unit 6 uses a device having a higher heating efficiency than the second heat source unit 8, and the second heat source unit 8 uses a device with a higher heating capacity than the first heat source unit 6. are doing. By making the first heat source device 6 and the second heat source device 8 have different capacities in this way, for example, heat is stored in the hot water HW of the tank 12 by the first heat source device 6 having high heating efficiency. When the demand for hot water is increased and the temperature of the upper layer side of the hot water HW is decreased, the temperature of the hot water HW on the upper layer side is increased by the second heat source device 8 having a high heating capacity, and the operation is performed according to the hot water supply demand. Therefore, the heating capacity may be complemented by the first heat source device 6 and the second heat source device 8.

  <Configuration and Function of Second Heat Source Unit 8>

  The second heat source unit 8 is provided with a pipe 14 that takes in hot water from the tank 12, heats the hot water and returns it to the inside of the tank 12. The pipe 14 is an example of a heating pipe of the present disclosure, and is connected to a middle layer of the tank 12 and connected to an inlet of the second heat source unit 8 and a second heat source unit 14A. A return pipe 14 </ b> B for flowing the hot water HW heated in 8 to the upper layer side of the tank 12 is provided. The pipe 14 may be provided with a pumping means such as a pump (not shown).

  For example, a switching valve 16 is provided in the pipe 14 at a position near the tank 12 on the return pipe 14B, and a bypass pipe 18 connected to one of the switching valves 16 is provided. The switching valve 16 is an example of switching means of the present disclosure, and switches the flow path of the return pipe 14B between the tank 12 side and the bypass pipe 18 side. The bypass pipe 18 connects the return pipe 14B and the outgoing pipe 14A, and allows hot water or the like in the return pipe 14B to flow to the outgoing pipe 14A by bypassing the tank 12. That is, the pipeline 14 can circulate the hot water in the going pipe 14A and the return pipe 14B to the second heat source device 8 without using the hot water in the going pipe 14A and the return pipe 14B by using the bypass pipe 18. Then, the second heat source device 8 performs a heating process according to the temperature of the hot water flowing in.

  This allows the second heat source device 8 to perform preheating for heating the hot water in the pipe 14 when the hot water HW is not being supplied to the tank 12.

  The return pipe 14 </ b> B of the pipe 14 is provided with a temperature sensor 20 that detects the temperature of the hot water HW on the outlet side of the heat source device 8. The temperature sensor 20 is an example of a first temperature sensor according to the present disclosure, and detects a temperature of hot water supplied to the tank 12 and a temperature of hot water during preheating. The control unit 10 may determine the execution and termination of the preheating process based on, for example, the temperature detected by the temperature sensor 20, and may control the switching of the switching valve 16 and the on / off of a pump (not shown).

  <Regarding the configuration on the tank 12 and the first heat source unit 6 side>

  The tank 12 is provided with a temperature sensor 22 at the height of the middle layer, for example, to detect the temperature of hot and cold water in the tank 12. The temperature sensor 22 is an example of the second temperature sensor of the present disclosure, and the detected temperature may be used as the start or stop timing of the preheating process on the first heat source device 6 side.

  The tank 12 is provided with a pipeline 24 including a feed pipe 24A for flowing hot and cold water with the first heat source unit 6 and a return pipe 24B. The outgoing pipe 24A is connected to, for example, the bottom or lower layer side of the tank 12, and the return pipe 24B is connected to the ceiling or upper layer side of the tank 12. The pipe line 24 of the first heat source unit 6 and the pipe line 14 of the second heat source unit 8 may be arranged so as not to be in contact with each other so that heat is not transferred by hot water flowing inside.

  <Hot water supply control>

  FIG. 2 is a flowchart illustrating an example of hot water supply control by the hot water supply system. The processing contents and processing procedures shown in this flowchart are merely examples, and the present invention is not limited to such contents.

  This hot water supply control is an example of the hot water supply control program of the present disclosure, and includes preliminary heating of the second heat source device 8 side.

  The hot water supply system 2 starts operation by executing, for example, power-on, setting operation, hot water supply requesting operation, and the like (S1). At the start of the operation, the control unit 10 operates the switching valve 16 to set the flow path of the return pipe 14B to the tank 12 side (S2). By setting the switching valve 16 on the tank 12 side, the responsiveness of hot water supply when auxiliary heating is required immediately can be improved.

  The control unit 10 captures the temperature detected by the temperature sensor 20 and monitors the temperature (TR) of the hot water in the return pipe 14B (S3). It is determined whether the temperature (TR) of the hot water in the return pipe 14B is lower than the storage temperature (TH) (S4). As the storage temperature (TH), for example, the lowest temperature of hot water HW on the upper layer side of tank 12 or the hot water supply temperature set in heat source device 8 is set.

  This storage temperature (TH) is used as an example of the monitoring temperature of the hot and cold water staying in the return pipe 14B. That is, if the hot and cold water staying in the return pipe 14B directly flows into the upper layer of the tank 12 at the start of the auxiliary heating, the temperature of the hot water HW stored in the tank 12 is affected. Therefore, the control unit 10 monitors whether the hot water in the return pipe 14B is lower than the hot water storage temperature TH in the tank 12, and prevents low-temperature hot water from being mixed into the tank 12.

  When the temperature (TR) of the hot and cold water in the return pipe 14B is lower than the storage temperature (TH) (YES in S4), the switching valve 16 is switched to the bypass pipe 18 side for performing preheating (S5), and the pump is started. (S6). For the second heat source device 8, a circulation path is formed in the pipe line 14 through the bypass pipe 18. When the hot water in the pipe 14 flows into the second heat source device 8 by starting the pump, the heat source device 8 is burned so as to have a temperature equal to or higher than the storage temperature (TH) (S7), and the hot water in the pipe 14 is reserved. Let it heat.

  When the temperature (TR) of the hot water in the return pipe 14B becomes equal to or higher than the storage temperature (TH) (NO in S4), the switching valve 16 is switched to the tank 12 side (S8). When the instruction of the auxiliary heating to the second heat source device 8 is issued, the operation of the pump and the heat source device 8 is continued, and when the instruction of the auxiliary heating is not issued, the pump and the combustion process are stopped. Just do it.

  <About the temperature state in the tank 12 and the execution processing of the preheating>

  The control unit 10 may perform a preliminary heating process of the second heat source device 8 based on, for example, the temperature state of the hot and cold water in the tank 12, and when the detected temperature of the temperature sensor 22 becomes lower than the predetermined temperature. The hot water in the pipeline 14 may be heated by switching the switching valve 16. By using the temperature of the hot water in the tank 12 as a trigger for the preheating, the hot water HW stored in the tank 12 is consumed by the execution of the hot water supply, so that the hot water is supplied before the amount of stored heat becomes insufficient. You can get ready.

  The temperature sensor 22 may use a sensor for detecting a temperature at a set height in the tank 12, or may be a sensor dedicated to preheating. In order to perform preheating before starting the auxiliary heating by the second heat source device 8, the temperature sensor 22 may be disposed on a lower layer side than a temperature sensor (not shown) serving as a reference for starting the auxiliary heating.

  In addition, in the hot water supply system 2, for example, the first heat source device 6 and the second heat source device 8 are operated in an operation mode according to the state of use of hot water supply by the user, or each of the heat source devices 6 and 8 is dissipated in the tank 12. It is also possible to set an operation mode in consideration of a loss reduction or the like, and to execute the operation control of the heat source units 6 and 8 based on the operation mode.

  <Effects of One Embodiment>

  According to such a configuration, the following effects can be obtained.

  (1) By circulating the hot water stored in the pipe 14 to the second heat source unit 8 side by the bypass path 18 and heating it, low-temperature hot water does not flow into the upper layer side of the tank 12 and the hot water supply system 2 It is possible to prevent the temperature of hot water from being supplied from lowering.

  (2) By heating the hot water stored in the pipeline 14 to a predetermined temperature or higher, it is possible to quickly respond to the auxiliary hot water supply instruction.

  (3) The hot water supply process can be performed at the required temperature without draining the high-temperature hot water to the upper layer side of the tank 12, and the convenience of the hot water supply system 2 is improved.

  (4) Since the temperature of the hot water in the pipe line 14 is raised at the time of the hot water supply request to the second heat source device 8, even if the tank 12 and the second heat source device 8 There is no mixing of cold water.

  (5) In the hot water supply system 2 of the present invention, the auxiliary heating can be quickly performed by the preliminary heating, so that the heat source unit 8 and the tank 12 can be arranged separately, and the degree of freedom of arrangement of the hot water supply system is increased.

  <Hot water supply system 30>

  FIG. 3 is a diagram illustrating an embodiment of the hot water supply system. The configuration shown in FIG. 3 is an example. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

  Hot water supply system 30 includes tank 12 that stores heated hot water, and includes tank unit 4 that supplies hot water to a hot water supply load, heat pump 32, and water heater 34. The tank unit 4 recovers and stores heat of the heat pump 32, which is an example of the first heat source device 6, and also has an example of the second heat source device 8 as an auxiliary heating means for responding to a temperature corresponding to a hot water supply request. The heat is stored using the hot water supply device 34. Further, in this hot water supply system 30, a preliminary heating process of heating the hot water in the pipe 14 connecting the hot water heater 34 and the tank 12 to a predetermined temperature before starting the auxiliary heating by the hot water heater 34 is performed.

  <About the configuration of the tank unit 4>

  In the tank unit 4, a tank 12 is installed in a housing, and a water supply line 36 and a tapping line 38 are installed for the tank 12. The water supply line 36 is connected to, for example, the bottom side of the tank 12, and the tap water or other water supply means is supplied with clean water W. The tapping pipe 38 is an example of a pipe that is connected to, for example, the upper side of the tank 12 and that flows the hot water HW toward the hot water supply load side. Further, the water supply pipe 36 is connected to a mixing pipe 40 that branches off upstream of the tank 12 and merges with the tapping pipe 38. A mixing valve 42 for setting the flow path of the clean water W at a predetermined ratio between the tank 12 and the tapping line 38 is provided at a connection portion between the water supply line 36 and the mixing line 40. . Further, the water supply pipe 36 may be provided with a pressure reducing valve 44, check valves 46 and 48, a water flow sensor 50 for monitoring a water supply state, and the like. The tapping line 38 is provided with a mixed water regulating valve 52 for adjusting the tapping amount of hot water mixed with the hot water HW and the tap water W.

  The tank 12 serves as a pipeline 24 connected to the heat pump 32, a hot water HW obtained by collecting heat of the heat pump 32 and a forward pipeline 24 </ b> A for flowing hot water CW and clean water W on the lower layer side of the tank 12 to the heat pump 32. A return line 24B for flowing to the upper layer side is provided. The return pipe 24B includes, for example, a branch pipe 54 that is branched at a position close to the tank 12 and is connected to the going pipe 24A. A switching valve 56 is provided at a branch portion between the branch pipe 54 and the return pipe 24B, and switches hot water flowing through the return pipe 24B to the tank 12 side or the forward pipe 24A side.

  In addition, a pump 58 for flowing hot and cold water into the pipeline 24 is installed in the going pipe 24A.

  As described above, the outgoing pipe 14A and the return pipe 14B are connected to the tank 12 as the pipe 14 connected to the water heater 34. The return pipe 14B includes a switching valve 16 and a bypass pipe 18. The outgoing pipe 14A may include a pump 60 for pumping hot water into the pipe line 14.

  The inside of the tank 12 is vertically divided into a plurality of regions, for example, from the upper layer to the lower layer, and temperature sensors 62-1, 62-2, 62-3, and 62-4 for monitoring a temperature state for each region. It has.

  Further, in the tank unit 4, a temperature sensor 62-5 is provided in the housing to detect the outside air temperature.

  A temperature sensor 62-6 for detecting the temperature of hot water from the tank 12, for example, and a temperature sensor 62-7 for detecting the temperature of the hot water HW mixed with the clean water W and adjusted to the required hot water supply temperature are provided on the hot water pipe 38. Is installed. The water supply line 36 is provided with a temperature sensor 62-8 for detecting a water supply temperature.

  The pipeline 24 connected to the heat pump 32 is provided with a temperature sensor 62-9 for detecting the temperature taken out of the tank 12 on the side of the outgoing pipe 24A and a temperature sensor 62-10 for detecting the temperature of the return pipe 24B.

  Further, the pipeline 14 connecting the water heater 34 and the tank 12 is provided with a temperature sensor 64 for detecting, for example, the temperature of hot water flowing or staying in the return pipe 14B. The temperature sensor 64 is an example of the first temperature sensor according to the present disclosure, and the detection result is based on a start or stop condition of the pre-heating process of the hot water on the water heater 34 side.

  <About heat pump 32>

The heat pump 32 includes, for example, a heat pump circuit 66 and a heat exchanger 68. In the heat pump circuit 66, for example, CO ₂ is circulated as a refrigerant for a heating device (not shown). In the heat exchanger 68, the refrigerant circulated in the heat pump circuit 66 exchanges heat recovered from the heat generating device with hot water flowing through the pipe 24. In addition, the heat pump circuit 66 may include an expansion valve (not shown), an air heat exchanger, and a compressor, which may form a CO ₂ refrigerant cycle. Further, a temperature sensor 62-11 for detecting the temperature of the hot water HW after the heat exchange is provided on the return pipe 24B side.

  <About water heater 34>

  Water heater 34 includes, for example, a burner 70 and a heat exchanger 72 in a combustion chamber. The burner 70 emits combustion exhaust by burning, for example, fuel gas. The heat exchanger 72 is connected to the pipe line 14, and heats by passing hot and cold water therein and exchanging heat with the combustion exhaust gas of the burner 70.

  The water heater 34 is provided with a water flow sensor 74 and a temperature sensor 62-12 on the side of the outgoing pipe 14A for taking in the hot water MW. The water heater 34 includes, for example, a control unit (not shown), and controls the combustion of the burner 70 in accordance with the set temperature and the flow rate detected by the water flow sensor 74. The water heater 34 is provided with a bypass 76 that bypasses the burner 70 and connects the going pipe 14A and the return pipe 14B, and a mixing valve 78 that switches the flow rate of the bypass 76 and distributes the flow.

  The return pipe 14B has a temperature sensor 62-13 for detecting the temperature of the hot water after the heat exchange in the heat exchanger 72 and a temperature sensor 62-14 for detecting the temperature of the hot water after the low-temperature hot and cold water is mixed through the bypass passage 76. Is provided.

  <Example of configuration of tank 12>

  FIG. 4 shows a configuration example of the tank. The tank 12 is formed of, for example, a cylindrical container that is long in the height direction. The tank 12 may have a capacity of, for example, about 90 [liter].

  The tank 12 is supplied with clean water W from a water supply pipe 36 connected to the lower layer according to, for example, the amount of hot water from the hot water pipe 38. Thus, a predetermined amount of hot and cold water is stored in the tank 12.

  The tank 12 supplies hot water from the upper layer side and water from the lower layer side, and the heated hot water HW is returned to the upper layer side. Therefore, the temperature distribution of hot water has a plurality of layers of heat storage areas in which the temperature increases from the lower layer side to the upper layer side. Be built. In this embodiment, for example, nine layers of heat storage areas I, II, III,... IX are assumed.

  The tank 12 includes a baffle plate 80 on the upper layer side and a baffle plate 82 on the lower layer side, for example. Each of the baffle plates 80 and 82 has a curved shape that is convex toward the middle layer side of the tank 12. The baffles 80 and 82 have curved concave portions directed toward the ceiling side or the bottom side of the tank 12, so that generation of a vortex due to tapping or water supply and rapid flow of hot water can be suppressed. This is an example of a means for preventing the hierarchical heat storage from being disturbed.

  The four temperature sensors 62-1, 62-2, 62-3, and 62-4 installed in the tank 12 detect the temperature of the hot and cold water areas, respectively, and are used for monitoring the temperature state of each area. In addition, it is used as a trigger of hot water supply control of the hot water supply system 2 and operation control of the heat pump 32 and the water heater 34.

  The temperature sensor 62-1 measures the boundary temperature between the heat storage region VIII and the heat storage region IX as a region not affected by the heat of the hot water HW flowing from the heat pump 32 or the water heater 34, for example. The temperature detected by the temperature sensor 62-1 is used as a heating start temperature of the heat pump 32 and the water heater 34.

  Temperature sensor 62-2 measures, for example, the temperature above the boundary between heat storage area VI and heat storage area VII. In this embodiment, an outgoing pipe 14A for flowing hot and cold water into the water heater 34 is disposed at the boundary between the heat storage area VI and the heat storage area VII. The temperature detected by the temperature sensor 62-2 is used as the starting temperature of the preheating process of the water heater 34.

  Temperature sensor 62-3 measures, for example, the temperature at the boundary between heat storage area IV and heat storage area V.

  The temperature sensor 62-4 measures, for example, the temperature at the boundary between the heat storage region II and the heat storage region III, and the detected temperature is used as the heating start temperature of the heat pump 32.

  In the tank 12, by providing the baffle plate 80, the disturbance of the hot water due to the hot water supply from the water heater 34 can be reduced in the upper portion DH, and the heat storage amount can be secured. Further, the baffle plate 82 prevents the low-temperature clean water W supplied in the heat storage regions I and II from entering the heat storage regions I and II with respect to the lower layer portion DL. Is suppressed, and the heat storage state can be secured without operating the heat pump 32 frequently.

  For example, as a first mode of operation control for heat pump 32 and water heater 34, water heater system 30 starts heat pump 32 based on the lower-layer detected temperature and starts water heater 34 based on the upper-layer detected temperature. You may make it do. Further, as a second mode of operation control, the heat pump 32 and the water heater 34 may be started based on the detected temperature of the upper layer, and the heat pump 32 may be stopped when the heat storage condition of the upper layer is satisfied.

  <Preliminary heating for hot and cold water in line 14>

  The hot water supply system 30 performs, for example, a preheating process of circulating hot water staying in the pipeline 14 on the side of the hot water supply device 34 for heating as hot water supply control. This preliminary heating process is performed before the auxiliary heating of the tank 12 by the water heater 34 is performed. The tank controller (not shown) determines the start of the preheating process, for example, when the detected temperature T2 of the temperature sensor 62-2 in the tank 12 becomes lower than the predetermined temperature.

  In the preheating process, as shown in FIG. 5, by setting the switching valve 16 from the tank 12 side to the return side, the return pipe 14B is connected to the bypass path 18 side. Thus, a circulation path is formed on the water heater 34 side by the going pipe 14A, the return pipe 14B, and the bypass pipe 18. That is, the preliminary heating process is a process of heating at least the hot water staying in the return pipe 14B from the hot water heater 34 to the switching valve 16, and prevents the hot water not heated by the hot water heater 34 from flowing into the tank 12. .

  In the hot water supply system 30, for example, the determination as to whether or not to perform the preheating process is made based on the length of the pipe 14 between the tank 12 and the water heater 34 and the amount of hot water staying in the pipe 14. do it. As a specific execution determination, for example, a time required from a start instruction of the auxiliary heating by the water heater 34 to a time when hot water is supplied into the tank 12 is compared with a time until the hot water HW in the upper layer in the tank 12 is consumed. May be. That is, by comparing the time required for hot water supply from hot water supply device 34, it can be determined whether or not the volume of heat storage region IX of hot water HW in tank 12 is larger than the volume (V1 + V2) of return pipe 14B. .

  By performing the preheating process, at least a volume V1 of the return pipe 14B up to the switching valve 16 can be heated to a predetermined temperature. This prevents the hot water HW in the tank 12 from being consumed at the start of the auxiliary heating by the water heater 34, and also prevents a large amount of unheated hot water from flowing into the tank 12. From the above points, it is preferable that the installation position of the switching valve 16 and the bypass pipe 18 in the pipeline 14 be a position close to the tank 12.

  Note that the condition for determining whether to perform the preheating process is not limited to the detected temperature T2 of the temperature sensor 62-2. For example, in addition to whether or not the tank unit 4 is supplying hot water, whether or not the heating process is being performed by the heat pump 32, and the like. May be set in combination.

  <Configuration of control unit of hot water supply system 30>

  FIG. 6 is a diagram illustrating a configuration example of a tank control unit. The configuration shown in FIG. 6 is an example.

  The control unit 84 is an example of the control unit of the present disclosure, and in addition to the hot water supply control of the hot water supply system 30, performs a control instruction for the tank unit 4, a control instruction including a heating process for the heat pump 32 and the water heater 34, and the like.

  The control unit 84 may include, for example, functional units such as a tank control unit 90, a heat pump control unit 102, a water heater control unit 112, and a remote control control unit 122.

  The tank control unit 90 controls the functional units such as the pumps 58 and 60 based on the detection information from each of the temperature sensors 62-1 to 62-10 installed in the tank unit 4, for example. The tank control unit 90 is formed of, for example, a microcomputer, and includes a processor 92, a memory unit 94, a system communication unit 96, a timer 98, an input / output (I / O) 100, and the like. The processor 92 arithmetically processes the operation control program of the tank unit 4 stored in the memory unit 94, controls hot water supply by the tank 12, monitors the hot water HW in the tank 12, heats the heat pump 32 and the water heater 34, An execution process of the preheating process is performed. The memory unit 94 is an example of a storage unit. The memory unit 94 stores an operation control program, and stores temperature information detected by the temperature sensors 62-1, 62-2,..., 62-10 installed in the tank unit 4. Remember. The memory unit 94 is configured by a recording medium such as a hard disk or a semiconductor memory, for example, as a ROM (Read Only Memory). Further, the memory unit 94 includes a RAM (Random Access Memory) functioning as a processing area for performing arithmetic processing of a program by the processor 92.

  The system communication unit 96 is a functional unit that communicates with the heat pump control unit 102, the water heater control unit 112, and the remote control unit 122 under the control of the processor 92, and transmits and receives control information by wire or wirelessly. The I / O 100 is an example of an interface for connecting to each functional unit of the tank unit 4 and captures detection information and outputs a control instruction with the tank control unit 90.

  The heat pump control unit 102 is an example of a unit that is installed in, for example, the heat pump 32 and that controls the operation of a heating unit (not shown) and the circulation of a heat medium. The heat pump control unit 102 is configured by a computer, for example, as shown in FIG. 7, and includes a processor 104, a memory unit 106, a system communication unit 108, and an I / O 110. The processor 104 executes a program stored in the memory unit 106, and performs information processing such as function control of the heat pump 32. The memory unit 106 stores programs and control information obtained by information processing. The system communication unit 108 is a functional unit that is connected to the tank control unit 90, the water heater control unit 112, and the remote control unit 122 under the control of the processor 104, and transmits and receives control information. The I / O 110 is connected to the temperature sensor 62-11 and takes in temperature detection information.

  The water heater control unit 112 is an example of a control unit that controls the operation of the water heater 34 including, for example, burner combustion control and fuel gas supply control. The water heater control unit 112 is configured by a computer, and includes a processor 114, a memory unit 116, a system communication unit 118, and an I / O 120. With such a configuration, hot water supply control unit 112 has an auxiliary heating process of heating hot water in tank 12 based on a control instruction from tank control unit 90 or a preliminary heating process of heating hot water staying in pipeline 14, for example. Execute The memory unit 116 stores an operation control program for operating the water heater 34, and also stores temperature information of the temperature sensors 62-12, 62-13, and 62-14 taken in through the I / O 120.

  Remote control unit 122 is an example of a control unit of a remote control device to which a setting operation for hot water supply system 30 is input. This remote control device performs input such as setting of a hot water supply request temperature and setting of an operation mode for the heat pump 32 and the water heater 34, as well as a status display function such as an operation state of the entire hot water supply system 30 and a set temperature, and an alarm. A notification function may be provided.

  The remote controller control unit 122 is configured by a microcomputer, and includes a processor 124, a memory unit 126, a system communication unit 128, and an I / O 130. The remote control unit 122 is connected to the tank control unit 90, the heat pump control unit 102, and the water heater control unit 112 through the system communication unit 128, and transmits input information and receives operation state information of each functional unit. The remote control control unit 122 is connected to the input means (SW) 132, the operation display unit 134, and the LED 136 of the remote control device via the I / O 130, and performs input operation capture, a display instruction of a driving state, an alarm, and a light emission instruction. .

  <Hot water heater pre-heating treatment>

  FIG. 8 is a flowchart showing an example of a preheating process by a water heater. The processing illustrated in FIG. 8 is an example.

  This preheating process is an example of the hot water supply control program according to the present disclosure, and the hot water in the pipeline 14 is caused to flow through the hot water supply device 34 to be heated.

  The tank controller 90 takes in the detected temperature T15 of the temperature sensor 64 to monitor the temperature of the hot and cold water in the return pipe 14B, and determines whether or not the detected temperature T15 is less than, for example, 65 ° C. as the storage temperature TH. (S11). The storage temperature TH may be set to, for example, the same temperature as the lowest temperature of the hot water HW stored in the upper layer of the tank 12. If hot water having a temperature lower than the temperature in the tank 12 is supplied, the temperature in the tank 12 is reduced. Therefore, the process may be shifted to the preheating treatment.

Here, an example of the temperature condition of the hot water supply system will be described.
(1) System hot water supply set temperature (Tset): a set value of the hot water supply temperature from the hot water supply system 30, and the maximum temperature is set to, for example, 75 ° C.
(2) Storage temperature of the tank 12: the temperature after heating of the heat pump 32, which is (Tset + 5 [° C.]). The lowest temperature of the storage temperature is, for example, 65 ° C.
(3) Temperature after water heater heating: (Tset + 10 ° C.), for example, the minimum temperature is set to 70 ° C. and the maximum temperature is set to 80 ° C.
(4) Reference temperature for starting auxiliary heating by water heater 34: temperature T1 detected by temperature sensor 62-1 may be set to (Tset + 3 [° C.]).
(5) Auxiliary heating stop reference temperature: The detection temperature T2 of the temperature sensor 62-2 may be set to (Tset + 3 [° C.]).
(6) The overheat temperature of the heat pump 32 is, for example, 48 ° C.
(7) As a reference for starting heating by the heat pump 32, the temperature T4 detected by the temperature sensor 62-4 may be set to, for example, (48 ° C-3 ° C) = 45 ° C.
(8) As a reference for stopping the heating by the heat pump 32, the detection temperature T9 of the temperature sensor 62-9 in the outflow pipe 24A for flowing hot water into the heat pump 32 is, for example, (48 ° C.-3 ° C.) = 45 ° C. Should be set to.

  When the detected temperature T15 is lower than the storage temperature TH (YES in S11), it is determined whether the temperature of the hot water in the tank 12 is lower than the reference temperature TS2, for example, 63 [° C.] as the reference temperature TS2. Is determined (S12). When the detected temperature T15 is equal to or higher than the storage temperature TH (NO in S11), the temperature is sufficient to supply hot water to the tank 12, and thus the preheating process may be terminated. When the detected temperature T2 of the temperature sensor 62-2 is lower than the reference temperature TS2 (YES in S12), preheating is started. When the detected temperature T2 is equal to or higher than the reference temperature T2 (NO in S12), the preheating process may be terminated.

  In the start determination of the preheating process, an auxiliary heating process for supplying hot water to the tank 12 is performed, for example, when the hot water in the tank 12 is being consumed, or when the temperature has dropped without performing the heating process. It is determined whether the possibility is high. In other words, when the temperature in the lower region than the installation position of the temperature sensor 62-1 which is one of the criteria for determining the start of the auxiliary heating has been lowered, the detected temperature T1 is not increased to the start temperature of the auxiliary heating. Preheating is performed.

  The tank control unit 90 sets the switching valve 16 on the return side, that is, on the bypass pipe 18 side (S13), and forms a circulation path on the water heater 34 side. Then, the timer 98 is started to measure the length of the water heater piping (S14). The hot water supply pump 60 is set to a predetermined rotation speed, and is set to, for example, 3 [liters / minute], which is the minimum flow rate for the water heater 34 to start combustion (S15). The number of rotations of the pump 60 may be set according to the length of the pipe 14 and the volume of hot and cold water.

  Temperature monitoring is continued until the temperature T15 detected by the temperature sensor 64 in the return pipe 14B becomes equal to or higher than the storage temperature TH (YES in S16).

  For example, the tank control unit 90 may determine whether or not to perform the pre-heating process by comparing the capacity of the pipeline 14 with the capacity of the upper layer of the tank.

  When the detected temperature T15 becomes equal to or higher than the storage temperature TH (NO in S16), the timer 98 reads out the time measurement result, and determines the timer value for the water heater pipe length measurement (S17).

  The amount of hot and cold water in the pipeline 14 can be calculated by, for example, “flow rate at preheating × pipe length measurement timer value”. Here, in the auxiliary heating by the water heater 34, the rotation speed of the pump 60 for flowing the hot water to the water heater 34 side is set to be equal to the consumption flow rate of the hot water in the tank 12. Therefore, by comparing the consumption time of the hot water HW on the upper layer with the time required for preheating, it can be determined whether or not the hot water in the tank 12 is supplied from the water heater 34 before it is consumed. May be used as a criterion for determining whether or not the information is necessary.

  Thus, it is determined whether the measured timer value is shorter than a predetermined time (S18). The predetermined time to be compared with the timer value is a pipe length determination timer value. The pipe length determination timer value is calculated by (volume of upper part of tank) / (minimum combustion flow rate of water heater). Assuming that the upper layer volume is about 10 [liter], the minimum combustion flow rate of the water heater is 3 [liter / minute] as the same value as the pump flow rate at the time of preheating, so that the pipe length determination timer value is about 3 minutes. Become.

  If the measured timer value is shorter than the predetermined time (YES in S18), “short” of the water heater pipe length flag is set in the tank controller 90 (S19). In this case, it is determined that the capacity of the hot water in the pipeline 14 is smaller than the capacity of the upper part of the tank 12, and for example, in the hot water supply process of the hot water supply system 30, it may be set not to perform the preheating.

  If the measured timer value is longer than the predetermined time (NO in S18), it is determined that preheating is necessary from the volume of the pipeline 14, and the setting of preheating is maintained.

  After the determination of the necessity of the preheating based on the measurement timer value, the pump 60 is stopped, and the preheating process ends (S20).

  It should be noted that whether or not the preheating is to be performed, for example, based on a user setting for hot water supply system 30, and the frequency thereof may be determined. Further, in the hot water supply system 30, when the setting is made to perform the preheating, the processing of the pipe length measurement based on the measured timer value may not be performed.

  Further, in determining the execution of the preheating, the upper layer volume cannot be uniformly grasped because it is determined by the overall capacity of the tank 12, the installation position of the temperature sensor 62-1 and the like. Therefore, as a preparatory operation at the start of the operation of the hot water supply system 30, the heating process is performed only by the hot water heater 34 until the temperature T1 detected by the temperature sensor 62-1 reaches a predetermined temperature, and the hot water supply capability of the hot water heater 34 is self-learned. Thus, it may be determined whether or not preheating is necessary.

  <Effect of Embodiment 1>

  (1) During the continuation of hot water supply, the temperature state of the middle layer in the tank 12 is monitored, and based on the temperature change, it is determined whether or not the auxiliary heating by the water heater 34 is necessary. Heat treatment can be minimized to save energy and increase efficiency.

  (2) By performing the process of determining the length of the pipe 14 in the preheating process, the necessity of the preheating for each hot water supply system 30 can be grasped.

  (3) By performing the pipe length determination process, execution setting information of the preheating process according to the installation conditions and operating conditions of the hot water supply system 30 can be obtained.

  (4) It is possible to automatically set whether or not to perform preheating by the determination process of the pipe length, thereby facilitating the installation process and the setting process of the hot water supply system 30.

  (5) By heating the hot water stored in the pipeline 14 to a predetermined temperature or more, it is possible to quickly respond to the auxiliary hot water supply instruction.

  (6) It is possible to avoid running out of hot water in the tank 12 during hot water supply before the auxiliary heating from the water heater 34 is started.

  FIG. 9 is a flowchart illustrating an example of water heater control according to the second embodiment. The processing contents and processing procedure shown in FIG. 9 are an example. In this hot water supply process, heat storage control of the tank 12 using the water heater 34 is performed.

  The tank controller 90 sets the switching valve 16 to the return side (S31), and sets the water heater pipe length flag, which is the setting information of the preheating process, to “long” (S32).

  It is determined whether or not the remote control device is ON (S33). If the remote control device is ON (YES in S33), the process proceeds to a determination as to whether or not preheating is to be performed on the water heater 34 side. When the water heater pipe length flag is set to "long" (YES in S34), the above-described pre-heating processing of the water heater pipe (FIG. 8) is performed (S35).

  In the preheating process, if the water heater pipe length flag is determined to be "short" by the pipe length measurement, the preheating may not be performed in the next and subsequent hot water supply processes.

  After the preheating process, the tank controller 90 determines whether or not the operation mode set as the heat storage and heat treatment of the hot water supply system 30 is “normal” (S36). If the operation mode is “normal” (YES in S36), A normal operation process is performed (S37). If the operation mode is not "normal" (NO in S36), it is determined whether the operation mode is "energy saving" (S38). If "energy saving" is set (YES in S38), energy saving operation processing is performed (S39). If the mode is not the "energy saving" mode (NO in S38), an OFF mode operation process is executed (S40).

  Here, the “normal” mode is an example of an operation mode in which hot water HW entirely heated from the upper portion DH to the lower portion DL of the tank 12 is stored and stored, and is executed when hot water consumption is high. What is necessary is just to increase the heating ratio of the heat pump 32 having a higher heating efficiency than the water heater 34. This mode may be set, for example, during a time period when hot water consumption is high.

  The “energy saving” mode is an example of an operation mode in which hot water HW heated in the upper portion DH and the middle upper portion DM of the tank 12 is stored and stored, for example. Heat loss from the side can be suppressed. This operation mode may be executed, for example, during a time period when it is not assumed that hot water consumption will occur.

  The “off” mode is an example of an operation mode in which, for example, hot water HW is not stored and the heat loss from the tank 12 is suppressed, and the water heater 34 is operated to cope with hot water consumption. This operation mode may be executed, for example, in a time period when it is not assumed that hot water consumption will occur, similarly to the energy saving mode.

  <About normal mode>

  FIG. 10 is a flowchart illustrating an example of water heater control in the normal mode.

  The tank control unit 90 determines whether the detected temperature T1 of the temperature sensor 62-1 is, for example, lower than 63 ° C. as the comparative temperature TS1 (S3701). If the detected temperature T1 is lower than the comparative temperature TS1 (YES in S3701), It is determined whether water supply has occurred on the 12th side (S3702). In this case, since the temperature of the hot water HW does not reach the set temperature (comparative temperature TS1) on the upper layer side of the tank 12, auxiliary heating by the water heater 34 is executed. Also. If the detected temperature T1 is equal to or higher than the comparison temperature TS1 (YES in S3701), the process returns to step S33 and waits until a hot water supply request is issued.

  When water is supplied to the tank 12 (YES in S3702), the number of rotations of the pump 60 is set as auxiliary heating by setting the number of rotations of the pump 60 for hot water supply at, for example, a flow rate corresponding to the flow rate of hot water supply ( S3704). When water is not generated in the tank 12 (NO in S3702), for example, to heat the water in the tank 12 using the water heater 34, "3 liters" which is an example of the minimum combustion rotation speed of the water heater 34 is used. / Min ”may be set to the rotation speed of the pump 60.

  During the auxiliary heating of the water heater 34, it is determined whether or not the detected temperature T15 of the temperature sensor 64 installed on the return pipe 14B is lower than the storage temperature TH, for example, 65 [° C.] (S3705). If the detected temperature T15 is lower than the storage temperature TH (YES in S3705), the switching valve 16 is set to the return side (S3706). If the detected temperature T15 is equal to or higher than the storage temperature TH (NO in S3705), the switching valve 16 is set to the tank. (S3708). That is, the control unit 90 operates the switching valve 16 when the temperature of the hot water in the return pipe 14B is sufficient.

  When the setting process of the switching valve 16 is completed, it is determined whether the detected temperature T2 of the temperature sensor 62-2 is equal to or higher than the comparison temperature TS2 (S3707). The auxiliary heating process is continued until the detected temperature T2 becomes equal to or higher than the comparative temperature TS2 (NO in S3707). When the detected temperature T2 is equal to or higher than the comparison temperature TS2 (YES in S3707), as preparation for ending the auxiliary heating of the water heater 34, the pump 60 is stopped (S3709), and the switching valve 16 is set to the return side (S3710). It returns to S33.

  <About energy saving mode>

  FIG. 11 is a flowchart illustrating an example of water heater control in the energy saving mode.

  It is determined whether the detected temperature T1 of the temperature sensor 62-1 is lower than the above-described comparison temperature TS1 (S3901). If the detected temperature T1 is lower than the comparison temperature TS1 (YES in S3901), it is determined whether or not water has been supplied to the tank 12 (S3902). In this case, since the temperature of the hot water HW does not reach the set temperature (comparative temperature TS1) on the upper layer side of the tank 12, the auxiliary heating by the water heater 34 is executed. Also. If the detected temperature T1 is equal to or higher than the comparison temperature TS1 (YES in S3701), the process returns to step S33 and waits until a hot water supply request is issued.

  If water is supplied to the tank 12 (YES in S3902), the number of revolutions of the pump 60 is set as auxiliary heating as the set number of revolutions of the pump 60, for example, so that the flow can be made at a flow rate corresponding to the flow rate of hot water supply (S3903). While the auxiliary heating of the water heater 34 is being performed, it is determined whether or not the detected temperature T15 of the temperature sensor 64 installed on the return pipe 14B is lower than the storage temperature TH, for example, 65 [° C.] (S3904).

  When the detected temperature T15 is lower than the storage temperature TH (YES in S3904), the switching valve 16 is set on the return side (S3905). When the detected temperature T15 of the temperature sensor 64 is higher than the storage temperature TH (NO in S3904), The switching valve 16 is set on the tank 12 side (S3906).

  When the setting process of the switching valve 16 is completed, it is determined whether the detected temperature T2 of the temperature sensor 62-2 is equal to or higher than the comparison temperature TS2 (S3907). The auxiliary heating process is continued until the detected temperature T2 becomes equal to or higher than the comparison temperature TS2 (NO in S3907). When the detected temperature T2 is equal to or higher than the comparison temperature TS2 (YES in S3907), as preparation for ending the auxiliary heating of the water heater 34, the pump 60 is stopped (S3908), and the switching valve 16 is set to the return side (S3909). It returns to S33.

  <Off mode>

  FIG. 12 is a flowchart illustrating an example of water heater control in the off mode.

  The tank control unit 90 determines whether the detected temperature T1 of the temperature sensor 62-1 is, for example, lower than 63 ° C. as the comparative temperature TS1 (S4001), and if the detected temperature T1 is lower than the comparative temperature TS1 (YES in S4001), It is determined whether water supply has occurred on the 12th side (S4002). In the off mode, since the heat pump 32 is stopped and the heat is not sufficiently stored in the tank 12, auxiliary heating by the water heater 34 is performed.

  Then, when water supply occurs in the tank 12 (YES in S4002), an additional rotation speed is set for the hot water supply pump 60 (S4003). As the additional rotation speed, for example, a rotation speed + N rotation speed corresponding to a flow rate corresponding to the hot water supply flow rate is set. If water is not being supplied to the tank 12 (NO in S3702), the pump 60 is stopped (S4008).

  During the auxiliary heating of the water heater 34, it is determined whether or not the detected temperature T15 of the temperature sensor 64 installed on the return pipe 14B is lower than the storage temperature TH, for example, 65 [° C.] (S4004). When the detected temperature T15 is lower than the storage temperature TH (YES in S4004), the switching valve 16 is set to the return side (S4005). When the detected temperature T15 is equal to or higher than the storage temperature TH (NO in S4004), the switching valve 16 is set to the tank. (S4006). That is, the control unit 90 operates the switching valve 16 when the temperature of the hot water in the return pipe 14B is sufficient.

  When the setting process of the switching valve 16 is completed, it is determined whether the detected temperature T2 of the temperature sensor 62-2 is equal to or higher than the comparison temperature TS2 (S4007). The auxiliary heating process is continued until the detected temperature T2 becomes equal to or higher than the comparative temperature TS2 (NO in S4007). When the detected temperature T2 is equal to or higher than the comparative temperature TS2 (YES in S4007), the pump 60 is stopped (S4008) and the switching valve 16 is set to the return side as preparation for ending the auxiliary heating of the water heater 34 (S4009). It returns to S33.

  <Hot water supply system 2>

  FIG. 13 is a flowchart illustrating an example of the hot water supply process.

  The tank control unit 90 determines the presence or absence of water supply based on, for example, the detection information of the water flow sensor 50 (S51), and when the supply of water is confirmed (YES in S51), starts the hot water supply process for the hot water supply load.

  The tank controller 90 performs a hot water supply process by FF control (S52). That is, in the hot water supply process, the hot water supply is started by adjusting the opening of the mixing valve 42 based on the detected temperatures T6 and T8 of the temperature sensors 62-6 and 62-8 and the set hot water supply temperature. When the instruction of the hot water supply process is output, the completion of the operation of the mixing valve 42 is waited (S53), and the hot water supply process by the FB control is performed (S54). In this hot water supply process, for example, the detected temperature T7 of the temperature sensor 62-7 on the hot water supply side is compared with a set hot water supply temperature, and the opening of the mixing valve 42 is adjusted. In the hot water supply process, for example, the hot water supply temperature may be different from the required temperature depending on the temperature state of the hot water in the tank 12, the distance to the hot water supply, and the operation mode of the heat pump 32 and the water heater 34. adjust.

  Since this hot water supply control is performed as long as the water supply, that is, the hot water supply request continues, the presence or absence of water supply by the water flow sensor 50 is constantly monitored (S55).

  <Operation control of heat pump 32>

  FIG. 14 is a flowchart illustrating an example of an operation control process of the heat pump.

  In the heat storage control of the tank 12 using the heat pump 32, when there is a driving instruction to the heat pump 32 (YES in S61), it is determined whether the operation mode is set to “normal” (S62). If the operation mode is “normal” (YES in S62), it is determined whether or not the detected temperature T4 of the temperature sensor 62-4 is lower than the lower limit reference temperature TM, for example, 45 [° C.] (S63). The lower-limit reference temperature TM may be set to a temperature which is lower by about -3 [deg.] C. than the temperature at which the heat pump 32 is assumed to overheat.

  When the detected temperature T4 is lower than the lower-limit reference temperature TM (YES in S63), the switching valve 56 installed in the return pipe 24B is set to the return side, and the switching is performed to the branch pipe 54 side, and the rotation speed Nf of the pump 58 is set to the predetermined rotation speed. For example, it is set to 2000 [rpm], and the heat pump 32 is started (S64).

  After the activation of the heat pump 32, if the detected temperature T10 of the temperature sensor 62-10 is equal to or higher than the predetermined temperature TL (YES in S65), the switching valve 56 is switched to the tank 12 side (S66). The rotational speed of the pump 58 is controlled so that the detected temperature T10 of the temperature sensor 62-10 becomes equal to the storage temperature TH (T10 = TH) (S67). In this case, if the temperature T7 of the hot water flowing through the tapping line 38 is, for example, 60 ° C. or lower, TH = 65 ° C. is set; otherwise, TH = system hot water set temperature + 5 [ ° C].

  The detected temperature T9 of the temperature sensor 62-9 is read, and it is determined whether or not the detected temperature T9 is equal to or higher than the lower-limit reference temperature TM (S68). The lower limit reference temperature TM is set, for example, to a temperature lower than the temperature at which the heat pump 32 overheats by about −3 ° C., for example, TM = 45 ° C.

  If the detected temperature T9 is not equal to or higher than the lower-limit reference temperature TM (NO in S68), it is determined whether a drive instruction for the heat pump 32 has been received (S69), and if there is a drive instruction (YES in S69), the process returns to S67. .

  If there is no drive instruction for the heat pump 32 (NO in S69), the switching valve 56 is switched to the return side, the pump 58 is stopped, and the heat pump 32 is stopped (S70).

(Energy saving mode)

  When the setting of the operation mode of the heat pump 32 is not “normal” (NO in S62) and is set to “energy saving” (YES in S71), the detection temperature T1 of the temperature sensor 62-1 is compared with the comparison temperature TS1. For example, it is determined whether it is less than 63 [° C.] (S72).

  When the detected temperature T1 is lower than the comparison temperature TS1 (YES in S72), monitoring of the temperature in the tank 12, setting of the switching valve 56, control of the rotation speed of the pump 58, monitoring of the temperature of hot and cold water in the return pipe 24B, and the like are performed. (S73-S78). Such processing may be performed in the same manner as the processing shown in steps S63 to S68.

  If the detected temperature T9 of the hot and cold water flowing to the heat pump 32 side is lower than the lower limit reference temperature TM (NO in S78), and if the detected temperature T2 of the temperature sensor 62-2 is not higher than the comparison temperature TS2 (NO in S79), the heat pump 32 Is determined (S80).

  (Off mode)

  If the operation mode is not “energy saving” (NO in S71), the operation mode is the off mode, and the heat pump 32 is not started.

  <Effect of Embodiment 2>

  (1) In the hot water supply process by the hot water supply system 30, a preliminary heating process by the hot water heater is set in advance, and by obtaining the hot water supply time information and the like, it is possible to determine whether or not the preheating is necessary, and to perform the preliminary heating process. An execution decision can be made.

  (2) By heating the hot water stored in the pipeline 14 to a predetermined temperature or higher, it is possible to quickly respond to the auxiliary hot water supply instruction.

  (3) Running out of hot water in the tank 12 during hot water supply can be avoided before the auxiliary heating from the water heater 34 is started.

  (Modification)

  Next, modified examples of the configuration and processing content described in the above embodiment or example will be described.

  (1) In the above embodiment, regarding whether or not to perform the preheating treatment, the case where the water heater 34 is operated to measure the pipe length and whether or not to perform the preheating based on the measurement result is determined. Although shown, it is not limited to this. The setting of the preheating may be performed by hardware using a dip switch or the like in the tank control unit 90 of the tank unit 4 when the hot water supply system 30 is installed, for example.

  (2) The preheating process of the hot water supply system 2 may be linked to an operation mode set to the heat storage and heat treatment by the heat pump 32 and the heat storage and heat treatment by the water heater 34. For example, hot water supply system 30 may execute the preheating process in the normal mode or the energy saving mode, and may not execute the preheating in the off mode. In the off mode, the temperature of the hot water in the tank 12 is low, and since the hot water is not discharged at the start of hot water supply, it is unlikely that the temperature of the hot water drops during hot water supply. Or only the hot water supply by the water heater 34 may be performed. Thereby, the number of times of the preliminary heating process can be limited, and energy saving can be achieved.

  (3) In the above embodiments and examples, the case where the preheating is started based on the temperature detected by the temperature sensor installed in the tank 12 has been described, but the present invention is not limited to this. The start timing of the preheating process may be set or adjusted in consideration of, for example, a hot water supply capacity and a distance condition between the water heater 34 and the tank 12.

  (4) In the preheating and auxiliary heating processes, the hot water supply flow rate and the rotation speed of the pump 60 flowing to the hot water supply device 34 are set to be equal, but the present invention is not limited to this. The rotation speed of the pump 60 may be larger than the hot water supply amount. Thereby, the preliminary heating process can be completed more quickly, and in the auxiliary heating process, heat can be stored in the hot and cold water in the tank 12, so that the hot water HW in the upper layer of the tank 12 can be prevented from being exhausted.

  (5) The preheating process and the auxiliary heating process are not limited to the case where the switching valve 16 installed in the return pipe 14B is switched to either the tank 12 side or the bypass pipe 18 side. Hot water may be supplied to both of the tubes 18. Thereby, warm water can always be circulated in the pipeline 14. In addition, in the preheating treatment, the flow of unheated hot water into the tank 12 can be reduced, and the hot water can be supplied into the tank 12 immediately after the start of the preheating, so that the responsiveness to a request for auxiliary heating can be improved.

As described above, the most preferred embodiment of the hot water supply system 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 detailed description. It goes without saying that such modifications and changes are included in the scope of the present invention.

In the hot water supply system and the hot water supply control program according to the present invention, the hot water in the tank is exhausted by preheating the hot water staying in the pipeline between the water heater and the tank as the second heat source device. This is useful because it is possible to prevent the unheated hot water from flowing into the tank during the auxiliary heating by the hot water supply device, and to stabilize the hot water supply temperature and improve the reliability of the hot water supply system.

2, 30 Hot water supply system 4 Tank unit 6 First heat source unit 8 Second heat source unit 10, 84 Control unit 12 Tank 14, 24 Pipe line 14A, 24A Outgoing pipe 14B, 24B Return pipe 16, 56 Switching valve 18, 76 Bypass pipes 20, 22, 62, 62-1 ... 62-14, 64 Temperature sensor 32 Heat pump 34 Water heater 36 Water supply line 38 Hot water supply line 40 Mixing line 42 Mixing valve 50, 74 Water flow sensor 52 Mixed water regulation Valve 54 Branch pipe 58, 60 Pump 66 Heat pump circuit 68, 72 Heat exchanger 70 Burner 78 Mixing valve 80, 82 Baffle plate 90 Tank control unit 98 Timer 102 Heat pump control unit 112 Water heater control unit 122 Remote control control unit 132 Input means 134 Operation display section 136 LED

Claims (7)

A hot water supply system that uses a plurality of heat source units in combination to supply hot water,
A tank for storing hot water,
A first heat source unit for heating lower water or water supply in the tank;
A second heat source unit that heats the middle layer of hot water in the tank and supplies hot water to the upper layer side of the tank;
A heating pipe including a feed pipe that takes in hot water in the tank and flows to the second heat source device side, and a return pipe that flows hot water heated by the second heat source device to the tank;
A bypass pipe that communicates the return pipe with the outgoing pipe, bypasses the tank, and circulates the hot water heated by the second heat source device in the heating pipe;
Switching means for switching an inflow destination of hot water heated by the second heat source unit to either the tank side or the bypass pipe side;
A first temperature sensor for detecting a temperature of hot water in the return pipe;
A second temperature sensor installed at a predetermined height in the tank;
When the temperature detected by the first temperature sensor is lower than the first temperature and the temperature detected by the second temperature sensor is lower than the second temperature, the switching unit is switched to the bypass pipe side, and the hot water in the road starts a Rutotomoni timer is pre-heated in the second heat source unit, when the detected temperature of the from the start of the pre-heating the first temperature sensor is equal to or greater than the first temperature timer value If the timer value is shorter than a predetermined time, the detection temperature of the first temperature sensor is lower than the first temperature and the detection temperature of the second temperature sensor is lower than the second temperature. said change in setting is not performed preheating, the timer value is to maintain the setting of the preheating longer than the predetermined time, the Ru to end the pre-heating control unit,
A hot water supply system comprising: Further comprising a pumping hands stage for pumping hot water before Symbol heating conduit,
Wherein, when the detected temperature of the second temperature sensor is lower than said second temperature, said pumping means is operated, characterized in that to execute the preliminary heating, according to claim 1 Hot water supply system. 3. The control device according to claim 1, wherein the control unit switches the switching unit to the tank when the temperature detected by the first temperature sensor is equal to or higher than the first temperature. 4. Hot water supply system. A hot water supply system that uses a plurality of heat source units in combination to supply hot water,
A tank for storing hot water,
A first heat source unit for heating lower water or water supply in the tank;
A second heat source unit that heats the middle layer of hot water in the tank and supplies hot water to the upper layer side of the tank;
A heating pipe including a feed pipe that takes in hot water in the tank and flows to the second heat source device side, and a return pipe that flows hot water heated by the second heat source device to the tank;
A bypass pipe that communicates the return pipe with the outgoing pipe, bypasses the tank, and circulates the hot water heated by the second heat source device in the heating pipe;
Switching means for switching an inflow destination of hot water heated by the second heat source unit to either the tank side or the bypass pipe side;
A first temperature sensor for detecting a temperature of hot water in the return pipe;
In the tank, a third temperature sensor installed at a position higher than the second temperature sensor installed at a predetermined height in the tank to monitor the temperature of hot water ,
When the detected temperature of the first temperature sensor is lower than a predetermined temperature, the switching unit is switched to the bypass pipe side, and the hot water in the heating pipe is preheated by the second heat source unit, and the third heat source is heated . When the detected temperature of the temperature sensor is lower than the set reference temperature, a control unit that starts supply of hot water heated by the second heat source device from the heating pipeline ,
Hot water supply system that is characterized in that it comprises. Further, information indicating the volume from the installation height of the third temperature sensor to the surface of the hot water stored in the tank, or reference time information required for flowing the hot water of this volume at a predetermined flow rate is stored. Storage unit to
A timer that measures the time that hot water flows in the return pipe,
With
The control unit compares the elapsed time until the hot and cold water in the return pipe reaches the tank measured by the timer with the reference time information stored in the storage unit, and based on the comparison result, performs the preheating. The hot water supply system according to claim 4, wherein it is determined whether or not to execute. A hot water supply program to be executed by a computer mounted on a hot water supply system including a tank for storing hot water and a first heat source device and a second heat source device for heating hot water or water in the tank.
Taking in the temperature of the hot water in the return pipe of the heating pipe from the first temperature sensor, in which the hot water heated by the second heat source device flows into the tank;
Taking in the detected temperature of a second temperature sensor installed at a predetermined height in the tank,
When the detected temperature of the first temperature sensor is lower than the first temperature and the detected temperature of the second temperature sensor is lower than the second temperature, the return pipe communicates with the going pipe of the heating pipeline. Switch the switching means to the bypass pipeline side to be
Preheating the hot and cold water circulating in the heating conduit by the second heat source unit and starting a timer ,
When the temperature detected by the first temperature sensor becomes equal to or higher than the first temperature after the start of the preheating, a timer value is read out. When the timer value is shorter than a predetermined time, the temperature detected by the first temperature sensor is detected. Is changed to a setting in which the preheating is not performed even if the temperature detected by the second temperature sensor is lower than the second temperature and lower than the first temperature, and if the timer value is longer than a predetermined time, Maintaining the preheating setting and terminating the preheating,
A hot water supply control program for causing the computer to realize the functions. If the detected temperature before Symbol second temperature sensor is lower than said second temperature, to operate the pumping means for pumping hot water of the heating conduit, to execute the preliminary heating,
The hot water supply control program according to claim 6, further comprising a function.

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