JP6586017B2 - Hot water supply system for multi-family houses - Google Patents

Description

  The present invention relates to a hot water supply system for a multi-family house.

  As this type of hot water supply system, Patent Document 1 discloses a hot water supply system applied to a two-family house in which a child household and a parent household reside. FIG. 6 shows the configuration of such a hot water supply system. As shown in FIG. 6, in the hot water supply system of Patent Document 1, as a hot water supply path, a first hot water supply path 51 for supplying hot water to a child household and a second hot water supply path 52 for supplying hot water to a parent household. And are provided. The first hot water supply path 51 includes a first hot water supply unit 54 that is a hot water storage type hot water heater, and a first hot water supply pipe 55 that extends from the first hot water supply unit 54 to a child household. The first hot water supply unit 54 includes a heating device 57 that heats water supplied from the water supply pipe 56, a hot water storage tank 58 that stores the heated water as hot water, and a backup boiler 59. When hot water is used in the child household, the hot water stored in the hot water storage tank 58 is supplied to the child household via the first hot water supply pipe 55. When the temperature of the hot water in the hot water storage tank 58 is low, the hot water is preheated by the backup boiler 59, and the heated hot water is supplied to the child household.

  On the other hand, the 2nd hot water supply path 52 is provided with the 2nd hot water supply unit 61 which consists of a gas water heater, and the 2nd hot water supply pipe 62 extended from the 2nd hot water supply unit 61 to a parent household. A water supply pipe 63 is connected to the second hot water supply unit 61, and the water supply pipe 63 is connected to the first hot water supply pipe 55 via a bypass pipe 65. In this case, hot water can be introduced from the first hot water supply pipe 55 into the second water supply pipe 62 through the bypass pipe 65. Further, a flow rate adjusting valve 66 is provided at a connection portion between the water supply pipe 63 and the bypass pipe 65. The flow rate adjusting valve 66 can adjust the flow rate of hot water introduced from the first hot water supply pipe 55 to the water supply pipe 63 through the bypass pipe 65.

  In the above configuration, when hot water is used in the parent household, hot water is introduced from the first hot water supply unit 54 (hot water storage tank 58) into the water supply pipe 63 via the first hot water supply pipe 55 and the bypass pipe 65, The introduced hot water and water are mixed in the water supply pipe 63 to become mixed water. Then, the mixed water is supplied from the water supply pipe 63 to the second hot water supply unit 61, and the supplied mixed water is heated in the unit 61 (gas water heater) to generate hot water. Then, the hot water is supplied from the unit 61 to the parent household. In this case, since the hot water in the hot water storage tank 58 can be used not only by the child household but also by the parent household, the gas consumption of the entire household can be suppressed and energy saving can be achieved.

JP2013-224769A

  By the way, in the hot water supply system of Patent Document 1 described above, when hot water is used simultaneously in the child household and the parent household, hot water is supplied from the first hot water supply unit 54 to the child household, and the second hot water supply on the parent household side. The unit 61 is also supplied with hot water. Therefore, in such a case, it is assumed that the flow rate of hot water supplied from the first hot water supply unit 54 increases.

  On the other hand, there is a limit to the flow rate of hot water that can be supplied from the first hot water supply unit 54. That is, in the first hot water supply unit 54, when the temperature of the hot water stored in the hot water storage tank 58 is low or the amount of hot water is small, the hot water is heated by the backup boiler 59 and then supplied. However, if the flow rate of hot water to be supplied increases, the heating by the backup boiler 59 cannot catch up, and there is a risk that hot water cannot be supplied sufficiently. Therefore, when hot water is used simultaneously in the child household and the parent household, for example, the amount of hot water that can be supplied from the first hot water supply unit 54 to the child household is reduced. There is a risk of inconvenience for the child households using it.

  The present invention has been made in view of the above circumstances, and in a system for supplying hot water to a first household and a second household, multiple households that can save energy while ensuring the use of hot water in the first household. The main purpose is to provide a hot water supply system for a house.

  In order to solve the above-mentioned problems, a hot water supply system for a multi-family house according to a first aspect of the present invention includes a first hot water supply path for supplying hot water to a first household and a second hot water supply path for supplying hot water to a second household. The first hot water supply path includes a heating unit that heats water supplied from the first water supply pipe, a hot water storage tank that stores the heated water as hot water, and a first hot water supply unit that includes a backup boiler. And a first hot water supply pipe for supplying hot water stored in the hot water storage tank to the first household, wherein the first hot water supply unit requires hot water stored in the hot water storage tank by the backup boiler. The second hot water supply path is heated in response to the first household, and the second hot water supply path includes a second hot water supply unit including a gas water heater that heats water supplied from a second water supply pipe and generates hot water, and Produced by the second hot water supply unit A second hot water supply pipe for supplying hot water to the second household, the first hot water pipe for guiding hot water from the first hot water supply pipe to the second hot water pipe, and the first hot water pipe through the first hot water pipe. A hot water storage unit that acquires hot water storage information that is information on at least one of the temperature and amount of hot water stored in the hot water storage tank, and a flow rate adjusting unit that adjusts the flow rate of hot water introduced from the hot water supply pipe to the second water supply pipe. Information acquisition means, and control means for controlling the flow rate adjusting unit to adjust the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe based on the acquired hot water storage information. It is characterized by.

  According to the present invention, when hot water is used in the second household, the hot water stored in the hot water storage tank of the first hot water supply unit is introduced into the second water supply pipe via the first hot water supply pipe and the hot water supply pipe. The introduced hot water and water are mixed in the same water supply pipe to form mixed water. Then, the mixed water is supplied from the second water supply pipe to the second hot water supply unit, and the supplied mixed water is heated by the same unit (gas water heater) to generate hot water. Then, the hot water is supplied to the second household. In this case, since the hot water in the hot water storage tank can be used not only in the first household but also in the second household, gas consumption for the entire household can be suppressed and energy saving can be achieved.

  When hot water is used simultaneously in the first household and the second household, hot water is supplied from the first hot water supply unit to the first household and second hot water supply unit, respectively. In this case, since the flow rate of hot water supplied from the first hot water supply unit (hot water storage tank) increases, if the temperature of the hot water in the hot water storage tank is low or the amount of hot water is small, the heating of the hot water by the backup boiler catches up. There is a risk that the first household will not be able to supply enough hot water. In this regard, in the present invention, the flow rate of hot water introduced from the first hot water supply pipe to the second hot water supply pipe based on the information (hot water storage information) related to at least one of the temperature and amount of hot water stored in the hot water storage tank, that is, the first The flow rate of hot water supplied from the first hot water supply unit to the second hot water supply pipe (and thus the second hot water supply unit) via the first hot water supply pipe (and hot water supply pipe) is adjusted. In this case, when the temperature of the hot water in the hot water storage tank is low or the amount of hot water is small, the flow rate of the hot water supplied from the first hot water supply unit to the second hot water supply unit is limited, so The amount (flow rate) of hot water supplied to one household can be secured. Therefore, it is possible to save energy while ensuring the use of hot water in the first household.

  A hot water supply system for a multi-family house according to a second aspect of the present invention is the hot water supply system according to the first aspect, wherein the first hot water supply unit supplies hot water to the first household at a predetermined hot water temperature. Hot water supply capacity calculation means for calculating the maximum flow rate of hot water that can be supplied at the hot water supply temperature from the first hot water supply unit based on the acquired hot water storage information is provided, and the control means is calculated by the hot water supply capacity calculation means. Based on the maximum flow rate, the flow rate adjusting unit adjusts the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe.

  According to the present invention, based on the hot water storage information regarding the hot water in the hot water storage tank, the maximum flow rate of hot water that can be supplied from the first hot water supply unit at a predetermined hot water supply temperature is calculated, and based on the calculated maximum flow rate, the first flow rate is calculated. The flow rate of hot water supplied from the first hot water supply unit to the second hot water supply unit is adjusted. That is, in this case, the flow rate of hot water supplied from the unit to the second hot water supply unit is adjusted based on the hot water supply capacity of the first hot water supply unit. Therefore, when the hot water supply capacity of the first hot water supply unit is reduced, the amount of hot water supplied from the first hot water supply unit to the first household is secured by limiting the amount of hot water supplied from the unit to the second hot water supply unit. be able to. For this reason, use of hot water in a 1st household can be ensured suitably.

  A hot water supply system for a multi-family house according to a third aspect of the present invention is based on the second aspect, and includes a flow rate detecting means for detecting a flow rate of hot water supplied from the first hot water supply unit to the first household, and the hot water supply capacity calculating means. Based on the calculated maximum flow rate and the hot water flow rate detected by the flow rate detection means, the first hot water supply unit supplies the second hot water supply tube via the first hot water supply pipe and the hot water supply pipe. Allowable value calculation means for calculating a maximum value of the flow rate of hot water as a flow allowable value, and the control means determines the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe. It adjusts by the said flow volume adjustment part so that it may become below a value, It is characterized by the above-mentioned.

  According to the present invention, based on the maximum flow rate of hot water that can be supplied from the first hot water supply unit and the flow rate of hot water supplied from the first hot water supply unit to the first household, the first hot water supply unit to the second water supply pipe ( As a result, the maximum value of the flow rate of hot water that can be supplied to the second hot water supply unit) is calculated as the allowable flow rate. And the said flow volume is adjusted so that the flow volume of the hot water supplied to a 2nd water supply pipe | tube from a 1st hot water supply unit may become below that flow volume tolerance. In this case, since the amount (flow rate) of hot water supplied from the first hot water supply unit to the first household can be ensured, the use of hot water in the first household can be reliably ensured.

  In a hot water supply system for a multi-family house according to a fourth aspect of the present invention, in the third aspect of the invention, the control means is configured such that the hot water introduced from the first hot water supply pipe to the second water supply pipe and the water in the second water supply pipe. Temperature control processing for adjusting the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe by the flow rate adjusting unit so that the temperature of the mixed water obtained by mixing becomes a predetermined target temperature. The temperature control process is performed in a range in which the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe does not exceed the allowable flow rate.

  In the present invention, the second water supply so that the temperature of the mixed water obtained by mixing the hot water introduced from the first hot water supply pipe into the second water supply pipe and the water in the water supply pipe becomes a predetermined target temperature. A temperature control process is performed in which the flow rate of hot water introduced into the pipe is adjusted. In this case, since the water (mixed water) having a fixed temperature flows into the second hot water supply unit, it is convenient for generating hot water in the same unit.

  Further, in the present invention, in such a configuration, the temperature control process is performed in a range in which the flow rate of hot water introduced into the second water supply pipe does not exceed the allowable flow rate. Therefore, it becomes possible to ensure the use of hot water in the first household while obtaining the above-described effect produced by the control.

  A hot water supply system for a multi-family house according to a fifth aspect of the present invention includes a first hot water supply path for supplying hot water to a first household and a second hot water supply path for supplying hot water to a second household. The hot water supply path is stored in the hot water storage tank, a first hot water supply unit having a heating unit that heats water supplied from the first water supply pipe, a hot water storage tank that stores the heated water as hot water, and a backup boiler. A first hot water supply pipe for supplying hot water to the first household, wherein the first hot water supply unit heats the hot water stored in the hot water storage tank as needed by the backup boiler. The second hot water supply path is generated by a second hot water supply unit including a gas water heater that heats water supplied from a second water supply pipe and generates hot water, and the second hot water supply unit. Tayu to the second household A second hot water supply pipe for supplying water, a hot water guide pipe for guiding hot water from the first hot water supply pipe to the second hot water supply pipe, and the second hot water supply pipe from the first hot water supply pipe through the hot water supply pipe A flow rate adjusting unit that adjusts the flow rate of hot water introduced into the water, a flow rate detecting unit that detects a flow rate of hot water supplied from the first hot water supply unit to the first household, and a hot water detected by the flow rate detecting unit. Control means for controlling the flow rate adjusting unit so as to adjust the flow rate of hot water introduced from the first hot water supply pipe to the second hot water supply pipe based on the flow rate.

  According to the present invention, the flow rate of hot water supplied from the first hot water supply unit to the second hot water supply unit is adjusted based on the flow rate of hot water supplied from the first hot water supply unit to the first household. In this case, the amount of hot water supplied from the first hot water supply unit to the second hot water supply unit when the flow rate of hot water supplied from the first hot water supply unit to the first household is large, that is, when the amount of hot water used in the first household is large. The amount (flow rate) of hot water supplied from the first hot water supply unit to the first household can be secured. Therefore, it is possible to save energy while ensuring the use of hot water in the first household.

  Moreover, you may employ | adopt the structure which combined 1st invention and 5th invention. That is, based on the hot water storage information acquired by the hot water storage information acquisition means and the flow rate of hot water detected by the flow rate detection means, the control means controls the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe. You may employ | adopt the structure adjusted with an adjustment part.

The figure which shows the structure of the hot water supply system of a two-family house. The figure which shows the electrical constitution of a hot-water supply system. The flowchart which shows a hot water supply control process. The figure which shows the structure of the hot water supply system in other embodiment. The figure which shows the structure of the hot water supply system in other embodiment. The figure which shows the structure of the hot water supply system in a prior art.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a hot water supply system applied to a two-family house in which a child household and a parent household reside is embodied. FIG. 1 is a diagram illustrating a configuration of a hot water supply system for a two-family house.

  As shown in FIG. 1, the house 10 of this embodiment is a two-family house having a first household 11 and a second household 12. The first household 11 is a resident part of the child household, and the second household 12 is a resident part of the parent household. The first household 11 is provided on the second floor portion of the house 10, and the second household 12 is provided on the first floor portion.

  Next, a hot water supply system for supplying hot water to the house 10 will be described.

  The hot water supply system includes a first hot water supply path 13 for supplying hot water to the first household 11 and a second hot water supply path 14 for supplying hot water to the second household 12. The first hot water supply path 13 is connected to a first water supply pipe 15 connected to a water pipe (not shown), a first hot water supply unit 16 to which the first water supply pipe 15 is connected, and the first hot water supply unit 16. A first hot water supply pipe 17 extending to the first household 11 is provided.

  The first hot water supply unit 16 is configured by a household fuel cell cogeneration system. The first hot water supply unit 16 includes a fuel cell unit 21, a hot water storage tank 22, and a backup boiler 23. The fuel cell unit 21 heats water (water supply) using exhaust heat generated with power generation, and the heated water is stored in the hot water storage tank 22 as hot water. The fuel cell unit 21 corresponds to a heating unit.

  Specifically, a first water supply pipe 15 is connected to the hot water storage tank 22, and water is supplied from the first water supply pipe 15 to the hot water storage tank 22. The water supplied to the hot water storage tank 22 is supplied to the fuel cell unit 21 and heated, and the heated water returns to the hot water storage tank 22 and is stored as hot water. The hot water storage tank 22 is provided with a tank hot water temperature sensor 28. The tank hot water temperature sensor 28 detects the temperature of the hot water stored in the hot water storage tank 22. The tank hot water temperature sensor 28 corresponds to hot water storage information acquisition means.

  The first hot water supply pipe 17 is connected to the hot water supply terminal 19 of the first household 11. When the hot water supply terminal 19 is operated to supply hot water, the hot water stored in the hot water storage tank 22 is supplied to the hot water supply terminal 19 through the first hot water supply pipe 17. Thereby, the hot water can be used in the first household 11. A backup boiler 23 is provided in the middle of the first hot water supply pipe 17. When the temperature of the hot water stored in the hot water storage tank 22 is low, the hot water from the hot water storage tank 22 is heated (preliminary heating) by the backup boiler 23, and the heated hot water is supplied to the hot water supply terminal 19. Thereby, hot water is supplied to the hot water supply terminal 19 at a preset hot water supply temperature (for example, 60 ° C.). Examples of the hot water supply terminal 19 include a kitchen faucet and a toilet faucet.

  The first hot water supply pipe 17 is provided with a flow rate sensor 35 that detects the flow rate of hot water flowing through the hot water supply pipe 17. The flow rate sensor 35 is disposed in the first hot water supply pipe 17 on the downstream side of the hot water supply pipe 31 described later. The flow rate sensor 35 detects the flow rate of hot water supplied from the first hot water supply unit 16 (hot water storage tank 22) to the first household 11 through the first hot water supply pipe 17. The flow rate sensor 35 corresponds to the flow rate detection means.

  The second hot water supply path 14 is connected to a second water supply pipe 25 connected to a water pipe (not shown), a second hot water supply unit 26 to which the second water supply pipe 25 is connected, and the second hot water supply unit 26. A second hot water supply pipe 27 extending to the second household 12 is provided. The second hot water supply unit 26 is constituted by a gas water heater, for example, a latent heat recovery type gas water heater. Water is supplied to the second hot water supply unit 26 from the second water supply pipe 25, and the supplied water is heated in the second hot water supply unit 26 to generate hot water.

  The second hot water supply pipe 27 is connected to the hot water supply terminal 29 of the second household 12. When the hot water supply terminal 29 is operated for hot water supply, hot water is supplied from the second hot water supply unit 26 to the hot water supply terminal 29 through the second hot water supply pipe 27. Thereby, hot water can be used in the second household 12. Examples of the hot water supply terminal 29 include a kitchen faucet and a toilet faucet.

  The second hot water supply pipe 27 is provided with a flow rate sensor 37 that detects the flow rate of hot water flowing through the hot water supply pipe 27. The flow rate sensor 37 detects the flow rate of hot water supplied from the second hot water supply unit 26 to the second household 12 through the second hot water supply pipe 27.

  The hot water supply system is provided with a hot water supply path for guiding hot water stored in the hot water storage tank 22 of the first hot water supply unit 16 to the second hot water supply path 14. For this reason, in the hot water supply system, the hot water stored in the hot water storage tank 22 can be used not only in the first household 11 but also in the second household 12, and thereby the gas in the second hot water supply unit 26 can be used. Consumption can be suppressed. Hereinafter, the structure regarding this hot water supply path | route is demonstrated.

  In the hot water supply system, a hot water supply pipe 31 that connects the first hot water supply pipe 17 of the first hot water supply path 13 and the second hot water supply pipe 25 of the second hot water supply path 14 is provided as the hot water supply path. Thereby, hot water can be guided from the first hot water supply pipe 17 to the second water supply pipe 25 through the hot water supply pipe 31. The hot water guide pipe 31 is provided with an open / close valve 32. By opening and closing the on-off valve 32, introduction of hot water from the first hot water supply pipe 17 to the second water supply pipe 25 through the hot water supply pipe 31 is permitted or prohibited. Further, the hot water guide pipe 31 is provided with a flow rate sensor 38 for detecting the flow rate of hot water flowing through the hot water guide pipe 31.

  A flow rate adjustment valve 33 is provided at a connection portion of the second water supply pipe 25 to which the hot water guide pipe 31 is connected. The flow rate adjusting valve 33 adjusts the flow rate of hot water introduced from the first hot water supply pipe 17 to the second water supply pipe 25 through the hot water guide pipe 31. Specifically, the second water supply pipe 25 has an upstream pipe part 25 a upstream of the flow rate adjustment valve 33 and a downstream pipe part 25 b downstream of the flow rate adjustment valve 33. In this case, the flow rate adjusting valve 33 is supplied with water from the upstream pipe portion 25a (water flow path) and hot water from the hot water guide pipe 31 (hot water flow path). In the flow rate adjusting valve 33, the supplied water and hot water are mixed to form mixed water, and the mixed water is sent from the flow rate adjusting valve 33 to the downstream pipe portion 25b (hot water mixed flow path). It has become.

  As described above, the flow rate adjusting valve 33 has a hot water amount adjusting function for adjusting the amount of hot water supplied from the hot water guiding pipe 31. Further, the flow rate adjusting valve 33 further has a water amount adjusting function for adjusting the amount of water supplied from the upstream side pipe portion 25a. That is, the flow rate adjustment valve 33 has a hot water adjustment function capable of adjusting the amounts of hot water and water respectively supplied from the hot water guide pipe 31 and the upstream pipe portion 25a. In this hot water supply system, by using the flow rate adjustment function of the flow rate adjustment valve 33, the mixing ratio of water and hot water supplied to the adjustment valve 33 is adjusted, so that the downstream pipe portion 25b ( As a result, the temperature of the mixed water delivered to the second hot water supply unit 26) is adjusted to a preset target temperature (for example, 40 ° C.). Further, a water temperature sensor 36 that detects the temperature of the mixed water is provided in the downstream side pipe portion 25b.

  In the above-described configuration, when the hot water supply terminal 29 of the second household 12 is operated for hot water supply, the on-off valve 32 is opened, and the hot water stored in the hot water storage tank 22 of the first hot water supply unit 16 is supplied to the first hot water supply pipe 17 and It is supplied to the flow rate adjustment valve 33 through the hot water guide pipe 31. The supplied hot water is mixed with water from the upstream side pipe portion 25a to become mixed water, and the mixed water is supplied from the flow rate adjusting valve 33 to the second hot water supply unit 26 and heated in the unit 26 to become hot water. Then, the hot water is supplied from the second hot water supply unit 26 to the hot water supply terminal 29. In this case, since the hot water in the hot water storage tank 22 is used to generate hot water by the second hot water supply unit 26, the amount of heat necessary for generating hot water by the unit 26, that is, the consumption amount of gas serving as fuel is reduced. Can be suppressed.

  Next, the electrical configuration of the hot water supply system will be described with reference to FIG. FIG. 2 is a diagram illustrating an electrical configuration of the hot water supply system.

  As shown in FIG. 2, the hot water supply system includes a controller 40 as control means. The controller 40 is composed mainly of a known microcomputer such as a CPU. A tank hot water temperature sensor 28, flow rate sensors 35, 37, and 38, and a water temperature sensor 36 are connected to the controller 40. The controller 40 receives the detection results sequentially from the sensors 28 and 35 to 38.

  An open / close valve 32 is connected to the controller 40. The controller 40 controls opening / closing of the opening / closing valve 32 based on the detection result from the flow sensor 37.

  The controller 40 is connected to a flow rate adjustment valve 33. The controller 40 controls the flow rate by the flow rate adjustment valve 33 based on the detection result from the water temperature sensor 36. That is, the controller 40 has a flow rate of hot water introduced from the first hot water supply pipe 17 to the second water supply pipe 25 via the hot water supply pipe 31 so that the temperature of the mixed water detected by the water temperature sensor 36 becomes the target temperature. Is controlled by the flow regulating valve 33.

  Next, hot water control processing executed by the controller 40 of the hot water system will be described with reference to FIG. FIG. 3 is a flowchart showing hot water supply control processing. This process is repeatedly executed at a predetermined cycle.

  As shown in FIG. 3, first, in step S11, based on the detection result of the tank hot water temperature sensor 28, the temperature of hot water stored in the hot water storage tank 22 (corresponding to hot water storage information) is acquired.

  In the subsequent step S12, the hot water can be supplied from the first hot water supply unit 16 at a predetermined hot water supply temperature α (for example, 60 ° C.) based on the acquired hot water temperature in the hot water storage tank 22 and the heating capacity of the backup boiler 23 (send out). Calculate the maximum flow rate of hot water possible. That is, in this step, the hot water supply capacity of the first hot water supply unit 16 is calculated. For example, if the temperature of hot water in the hot water storage tank 22 is high, heating by the backup boiler 23 catches up even if the flow rate of hot water supplied from the first hot water supply unit 16 is large. In this case, hot water that can be supplied at the hot water supply temperature α The maximum flow rate increases. On the other hand, when the temperature of the hot water in the hot water storage tank 22 is low, the heating by the backup boiler 23 cannot catch up when the flow rate of hot water supplied from the first hot water supply unit 16 is large. The maximum flow rate of hot water is reduced.

  In step S <b> 13, the flow rate of hot water supplied from the first hot water supply unit 16 to the first household 11 is acquired based on the detection result from the flow sensor 35. In other words, the amount of hot water (per unit time) used in the first household 11 is acquired. When hot water is not used in the first household 11, the hot water flow rate is acquired as zero.

  In step S14, based on the maximum flow rate of hot water that can be supplied from the first hot water supply unit 16 calculated in step S12 and the supply flow rate of hot water from the first hot water supply unit 16 acquired in step S13 to the first household 11, The maximum value of the flow rate of hot water that can be supplied from the first hot water supply unit 16 to the second hot water supply pipe 25 via the first hot water supply pipe 17 and the hot water supply pipe 31 is calculated. Specifically, the maximum value of the flow rate of hot water that can be supplied from the first hot water supply unit 16 to the second water supply pipe 25 is calculated by subtracting the supply flow rate acquired in step S13 from the maximum flow rate calculated in step S12. To do. In other words, this maximum value is obtained from the first hot water supply unit 16 to the second water supply pipe 25 while ensuring the flow rate of hot water (hot water having a hot water supply temperature α) supplied from the first hot water supply unit 16 to the first household 11. In the case of supplying, it corresponds to the maximum value of the flow rate of hot water allowed to be supplied from the first hot water supply unit 16 to the second water supply pipe 25.

  In step S15, the maximum flow rate calculated in step S14 is set as the allowable flow rate value K.

  In step S <b> 16, based on the detection result from the flow sensor 37, it is determined whether hot water is supplied from the second hot water supply unit 26 to the second household 12. That is, it is determined whether hot water is used in the second household 12. When hot water is not used in the second household 12, the process proceeds to step S18, and the on-off valve 32 is closed. Thereby, the introduction of hot water from the first hot water supply pipe 17 to the second water supply pipe 25 through the hot water supply pipe 31 is prohibited. Thereafter, this process is terminated.

  On the other hand, when hot water is used in the second household 12, the process proceeds to step S17, and the on-off valve 32 is opened. Thereby, the introduction of hot water from the first hot water supply pipe 17 through the hot water supply pipe 31 to the second water supply pipe 25 (downstream pipe portion 25b) is allowed. In this case, hot water is supplied from the first hot water supply unit 16 to the flow rate adjustment valve 33 via the first hot water supply pipe 17 and the hot water supply pipe 31, and the supplied hot water is mixed with water in the adjustment valve 33 and mixed water and Become. Then, the mixed water is supplied to the second hot water supply unit 26 and heated in the unit 26 to become hot water, and the hot water is supplied to the second household 12.

  Incidentally, in the above step S16, it is determined whether or not hot water is used in the second household 12 based on the detection result of the flow sensor 37, but this is changed and the second hot water supply pipe 27 is connected to the inside of the pipe. A pressure sensor for detecting the pressure may be provided, and the determination may be performed based on the pressure in the pipe detected by the sensor.

  In step S19 after step S17, the flow rate of hot water introduced from the first hot water supply pipe 17 into the second hot water supply pipe 25 through the hot water supply pipe 31 is determined based on the detection result from the flow sensor 38. It is determined whether or not it exceeds. In other words, here, it is determined whether or not the flow rate of hot water supplied from the first hot water supply unit 16 to the second hot water supply pipe 25 via the first hot water supply pipe 17 and the hot water supply pipe 31 exceeds the allowable flow rate K. To do.

  When the flow rate of hot water introduced from the first hot water supply pipe 17 to the second water supply pipe 25 exceeds the allowable flow rate K, the process proceeds to step S20. In step S20, the flow rate is controlled by the flow rate adjustment valve 33 so that the flow rate of the hot water is equal to or less than the allowable flow rate K. Specifically, the flow rate control is performed so that the flow rate of the hot water becomes the same value as the allowable flow rate value K. Thereafter, this process is terminated. On the other hand, when the flow rate of hot water introduced into the second water supply pipe 25 is equal to or less than the allowable flow rate K, the process proceeds to step S21.

  In step S21, based on the detection result from the water temperature sensor 36, it is determined whether or not the temperature of the mixed water in the second water supply pipe 25 (downstream pipe section 25b) is a predetermined target temperature β. When the temperature of the mixed water is the target temperature β, this process is terminated. If the temperature of the mixed water is not the target temperature β, the process proceeds to step S22.

  In step S22, it is determined whether the temperature of the mixed water is lower or higher than the target temperature β. If the temperature of the mixed water is higher than the target temperature β, the process proceeds to step S25. In step S25, the flow rate of the hot water introduced from the first hot water supply pipe 17 to the second water supply pipe 25 is decreased by controlling the flow rate adjusting valve 33. That is, the flow rate of hot water supplied from the first hot water supply unit 16 to the second water supply pipe 25 is decreased. Thereby, the temperature of mixed water becomes low. Thereafter, this process is terminated.

  On the other hand, if the temperature of the mixed water is lower than the target temperature β, the process proceeds to step S23. In step S23, based on the detection result from the flow sensor 38, it is determined whether or not the flow rate of hot water introduced from the first hot water supply pipe 17 to the second water supply pipe 25 has reached the flow rate allowable value K. When the flow rate of the hot water reaches the allowable flow rate value K, if the flow rate is further increased, the flow rate exceeds the allowable flow rate value K, and thus this processing is terminated. Thereby, the flow volume of the hot water supplied to the 1st household 11 from the 1st hot water supply unit 16 is ensured. On the other hand, when the flow rate of the hot water does not reach the allowable flow rate value K, the process proceeds to step S24.

  In step S24, the flow rate of the hot water introduced from the first hot water supply pipe 17 to the second water supply pipe 25 is increased by controlling the flow rate adjusting valve 33. That is, the flow rate of hot water supplied from the first hot water supply unit 16 to the second water supply pipe 25 is increased. Thereby, the temperature of mixed water becomes high. Thus, in steps S21 to S24, the flow rate of the hot water introduced into the second water supply pipe 25 is adjusted by the flow rate adjustment valve 33 so that the temperature of the mixed water becomes the target temperature β. Thereafter, this process is terminated.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  Since the hot water guide pipe 31 for introducing hot water from the first hot water supply pipe 17 to the second water supply pipe 25 is provided, when hot water is used in the second household 12, the first hot water supply unit 16 (hot water storage tank 22). It is possible to supply hot water to the second water supply pipe 25 through the first hot water supply pipe 17 and the hot water supply pipe 31. In this case, mixed water in which the supplied hot water and water are mixed is supplied to the second hot water supply unit 26, and the mixed water is heated in the unit 26 to generate hot water. Then, the hot water is supplied to the second household 12. In this case, since the hot water in the hot water storage tank 22 can be used not only in the first household 11 but also in the second household 12, gas consumption for the entire household can be suppressed and energy saving can be achieved.

  Further, in such a configuration, the hot water temperature in the hot water storage tank 22 detected by the tank hot water temperature sensor 28 is introduced from the first hot water supply pipe 17 into the second water supply pipe 25 through the hot water supply pipe 31. The flow rate adjustment valve 33 controls the flow rate of hot water, that is, the flow rate of hot water supplied from the first hot water supply unit 16 to the second water supply pipe 25 (and hence the second hot water supply unit 26) via the first hot water supply pipe 17 and the hot water supply pipe 31. I adjusted it. In this case, when the temperature of the hot water in the hot water storage tank 22 is low, the flow rate of the hot water supplied from the first hot water supply unit 16 to the second hot water supply unit 26 is limited to supply the hot water from the unit 16 to the first household 11. The amount (flow rate) of hot water to be used can be secured. Therefore, it is possible to save energy while ensuring the use of hot water in the first household 11.

  Based on the temperature of the hot water in the hot water storage tank 22, the maximum flow rate of hot water that can be supplied from the first hot water supply unit 16 at the predetermined hot water supply temperature α is calculated, and the first flow rate from the first hot water supply unit 16 is calculated based on the calculated maximum flow rate. 2 The flow rate of hot water supplied to the hot water supply unit 26 is adjusted by the flow rate adjustment valve 33. That is, the hot water flow rate is adjusted based on the hot water supply capacity of the first hot water supply unit 16. In this case, when the hot water supply capacity of the first hot water supply unit 16 is reduced, the amount of hot water supplied from the unit 16 to the second hot water supply unit 26 is limited, so that the first hot water supply unit 16 moves to the first household 11. The amount of hot water supply can be secured. Therefore, the use of hot water in the first household 11 can be suitably secured.

  The flow rate of hot water supplied from the first hot water supply unit 16 to the first household 11 is detected by the flow sensor 35, and the flow rate of hot water supplied from the first hot water supply unit 16 to the second hot water supply unit 26 based on the detected flow rate. Was adjusted by the flow rate adjusting valve 33. In this case, when the flow rate of hot water supplied from the first hot water supply unit 16 to the first household 11 is large, that is, when the amount of hot water used in the first household 11 is large, the first hot water supply unit 16 to the second hot water supply. By limiting the amount of hot water supplied to the unit 26, the use of hot water in the first household 11 can be suitably secured.

  Specifically, based on the calculated maximum hot water flow rate that can be supplied from the first hot water supply unit 16 and the hot water flow rate detected by the flow rate sensor 35, the first hot water supply unit 16 to the second water supply pipe 25 (and eventually The maximum value of the flow rate of hot water that can be supplied to the second hot water supply unit 26) was calculated, and the calculated maximum value was set as the allowable flow rate value K. The flow rate was adjusted by the flow rate adjustment valve 33 so that the flow rate of hot water supplied from the first hot water supply unit 16 to the second water supply pipe 25 was equal to or less than the allowable flow rate K. In this case, since the amount (flow rate) of hot water supplied from the first hot water supply unit 16 to the first household 11 can be reliably ensured, the use of hot water in the first household 11 can be reliably ensured.

  The second water supply so that the temperature of the mixed water obtained by mixing the hot water introduced from the first hot water supply pipe 17 into the second water supply pipe 25 and the water in the water supply pipe 25 becomes a predetermined target temperature β. A temperature control process for adjusting the flow rate of hot water introduced into the pipe 25 by the flow rate adjusting valve 33 was performed. In this case, since the water (mixed water) of a fixed temperature flows into the second hot water supply unit 26, it is convenient for generating hot water in the unit 26.

  In such a configuration, the temperature control process is performed in a range where the flow rate of hot water introduced into the second water supply pipe 25 does not exceed the allowable flow rate value K. Therefore, it becomes possible to ensure the use of hot water in the first household 11 while obtaining the above-described effect by the control process.

  The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  (1) In the above embodiment, the first hot water supply unit 16 to the second hot water flow rate detected by the flow sensor 35, that is, the actual hot water flow rate supplied from the first hot water supply unit 16 to the first household 11. Although the maximum value of the flow rate of hot water that can be supplied to the two water supply pipes 25 (second hot water supply unit 26) (that is, the allowable flow rate value K) is calculated, it may be changed. For example, assuming the use amount of hot water (per unit time), for example, the average use amount when hot water is used in the first household 11, the use amount is registered (stored) in the controller 40 in advance. . Then, the allowable flow rate K may be calculated based on the registered usage data of hot water in the first household 11.

  (2) For example, in the hot water supply system of the above embodiment, the flow rate adjustment valve 33 may be omitted. In this case, the flow rate of hot water supplied from the first hot water supply unit 16 to the second hot water supply unit 26 is determined according to the amount of hot water used in the second household 12 (amount used per unit time). Therefore, in such a configuration, when the flow rate of hot water supplied from the first hot water supply unit 16 to the second hot water supply unit 26 exceeds the allowable flow rate K, the on-off valve 32 is closed to supply such hot water. Is prohibited (in other words, the hot water flow rate is set to 0). Even in this case, since the supply of hot water from the first hot water supply unit 16 to the first household 11 can be ensured, the use of hot water in the first household 11 can be reliably ensured. In this case, the on-off valve 32 corresponds to the flow rate adjusting unit.

  (3) In the above-described embodiment, the on-off valve 32 and the flow rate adjustment valve 33 are provided in the hot water supply system. However, by changing this, only one valve that integrates the functions of the valves 32 and 33 is provided. It may be. FIG. 4 shows a hot water supply system provided with such a valve. As shown in FIG. 4, in the hot water supply system of this example, an adjustment valve 49 is provided at a connection portion of the second water supply pipe 25 with the hot water guide pipe 31. The adjustment valve 49 is disposed at the same position as the flow rate adjustment valve 33 in the above-described embodiment, and has the same flow rate adjustment function as the flow rate adjustment valve 33. The adjustment valve 49 further has an opening / closing function that permits or prohibits introduction of hot water from the first hot water supply pipe 17 through the hot water supply pipe 31 to the second water supply pipe 25. Therefore, the adjusting valve 49 has both the functions of the on-off valve 32 and the flow rate adjusting valve 33 in the above embodiment. According to such a configuration, the number of valves can be reduced as compared with the configuration of the above-described embodiment. Therefore, the same effect as that of the above-described embodiment can be obtained while simplifying the configuration.

  (4) In the above embodiment, the hot water supplied from the first hot water supply unit 16 to the second hot water supply unit 26 based on the hot water temperature (hot water temperature information) in the hot water storage tank 22 detected by the tank hot water temperature sensor 28. The flow rate is adjusted, but this may be changed. For example, in the hot water storage tank 22, high temperature hot water may be stored in an upper layer and low temperature water may be stored in a lower layer. Therefore, in such a case, a hot water amount detection sensor is provided to detect how much hot water has a predetermined temperature or more in the hot water storage tank 22, and based on the amount of hot water detected by the sensor (corresponding to hot water storage information). Thus, it is conceivable to adjust the flow rate of hot water supplied from the first hot water supply unit 16 to the second hot water supply unit 26. Even when the amount of hot water in the hot water storage tank 22 is small, the hot water supply capacity of the first hot water supply unit 16 decreases as in the case where the hot water temperature in the hot water storage tank 22 is low. By limiting the amount of hot water supplied, the amount (flow rate) of hot water supplied from the first hot water supply unit 16 to the first household 11 can be secured.

  The flow rate adjustment may be performed based on both the amount of hot water detected by the hot water amount detection sensor and the hot water temperature detected by the tank hot water temperature sensor 28.

  (5) In the above embodiment, based on the detection result of the water temperature sensor 36, the second water supply pipe so that the temperature of the mixed water in the second water supply pipe 25 (downstream pipe portion 25b) becomes the predetermined target temperature β. The flow rate of hot water (and the flow rate of water) introduced into 25 (downstream pipe portion 25b) is adjusted by the flow rate adjustment valve 33, but the configuration for setting the temperature of the mixed water to the target temperature β is not necessarily required. It is not limited to the configuration.

  For example, a configuration using a thermostat type temperature adjusting valve (for example, a thermomixing valve) as the flow rate adjusting valve 33 can be considered. Specifically, the flow rate adjustment valve 33 includes a temperature sensing part that senses the temperature of the mixed water therein, and the downstream pipe part 25b (in other words, the flow rate based on the temperature of the mixed water sensed by the temperature sensing part. And a flow rate adjusting mechanism for adjusting the flow rate of hot water and water introduced into the adjusting valve 33). More specifically, the flow rate adjustment valve 33 adjusts the flow rate of hot water and water with a flow rate adjustment mechanism so that the temperature of the mixed water sensed by the temperature sensing unit does not exceed a predetermined temperature β set in advance. It has become a thing.

  Also in the above configuration, the temperature of the mixed water can be set to a predetermined target temperature β. In the above configuration, since the flow rate is adjusted using the internal mechanism (only) of the flow rate adjustment valve 33 (temperature adjustment valve), the water temperature sensor 36 can be dispensed with. The flow rate adjustment control based on the detection result can be made unnecessary.

  (6) FIG. 5 shows another embodiment of the hot water supply system. In the hot water supply system shown in FIG. 5, a flow rate adjustment valve 45 including a temperature adjustment valve is provided at a connection portion of the second water supply pipe 25 with the hot water guide pipe 31. The flow rate adjustment valve 45 is composed of, for example, the temperature adjustment valve described in (5) above. Further, in the hot water supply system of this example, an opening / closing valve 46 is provided at a connection portion of the first hot water supply pipe 17 with the hot water supply pipe 31. The on-off valve 46 opens or closes to permit or prohibit the supply of hot water from the first hot water supply pipe 17 to the hot water supply pipe 31, and as a result, from the first hot water supply pipe 17 through the hot water supply pipe 31 to the second hot water supply. The supply of hot water to the pipe 25 is permitted or prohibited. In this case, the on-off valve 46 corresponds to a flow rate adjusting unit.

  In the hot water supply system of this example, it can be considered that the controller 40 performs, for example, the following control processes (a) and (b).

(A) Based on the temperature of hot water in the hot water storage tank 22 detected by the tank hot water temperature sensor 28, the on-off valve 46 is controlled to open and close (in other words, introduced from the first hot water supply pipe 17 to the second water supply pipe 25). The flow rate of hot water is controlled to 0 or a flow rate larger than 0). Specifically, when the temperature of the hot water in the hot water storage tank 22 is equal to or lower than a predetermined temperature, the on-off valve 46 is closed (the flow rate of the hot water is 0), and the hot water temperature in the hot water storage tank 22 is the predetermined temperature. If it is higher, the control may be performed so that the on-off valve 46 is opened (the flow rate of the hot water is greater than 0).
It is possible.

  (B) Based on the flow rate of hot water detected by the flow sensor 35, the open / close valve 46 is controlled to open and close. Specifically, when the flow rate of hot water detected by the flow sensor 35 is larger than 0 (in other words, when the flow rate of hot water is detected by the flow sensor 35), the on-off valve 46 is closed, and the flow sensor When the flow rate of hot water detected by 35 is 0 (in other words, when the flow rate of hot water is not detected by the flow sensor 35), it is conceivable to control the open / close valve 46 to be opened.

  According to the control (a), the supply of hot water from the first hot water supply unit 16 to the second hot water supply unit 26 is prohibited when the temperature of the hot water in the hot water storage tank 22 is low. According to the control (b), when hot water is supplied from the first hot water supply unit 16 to the first household 11, that is, when hot water is used in the first household 11, the first hot water supply Supply of hot water from the unit 16 to the second hot water supply unit 26 is prohibited. Therefore, also in these cases, it is possible to save energy while ensuring the use of hot water in the first household 11.

  Incidentally, both of the controls (a) and (b) are not necessarily performed, and only one of the controls (a) and (b) may be performed.

  In addition, as the on-off valve 46, when the flow of the hot water toward the 1st household 11 arises in the 1st hot water supply pipe 17, the thing provided with the mechanism in which the said on-off valve 46 shifts to a closed state based on it may be used. . Even in that case, when hot water is used in the first household 11, the supply of hot water from the first hot water supply unit 16 to the second hot water supply unit 26 is prohibited, so the same effect as the control in (b) above is achieved. can get. In such a case, the flow sensor 35 can be omitted.

  In the control (a), the on / off valve 46 is controlled to open / close based on the temperature of the hot water in the hot water storage tank 22 detected by the tank hot water temperature sensor 28. As described in (4), the opening / closing valve 46 may be controlled to open / close based on the amount of hot water in the hot water storage tank 22 detected by the hot water detection sensor.

  (7) In the above embodiment, the temperature of hot water in the hot water storage tank 22 detected by the tank hot water temperature sensor 28 and the flow rate of hot water detected by the flow sensor 35 (supplied from the first hot water supply unit 16 to the first household 11). The flow rate of hot water introduced from the first hot water supply pipe 17 to the second water supply pipe 25 is adjusted by the flow rate adjustment valve 33 based on both of the hot water flow rate in the hot water storage tank 22 and The flow rate of hot water introduced from the first hot water supply pipe 17 to the second water supply pipe 25 may be adjusted based on one of the flow rates of hot water supplied to the first household 11.

  (8) In the above embodiment, the first hot water supply unit 16 is configured by a fuel cell cogeneration system having the fuel cell unit 21 (generator) as a heating unit. You may comprise by the cogeneration system which has other generators, such as an engine generator, as a heating part. Moreover, the heating part of the 1st hot water supply unit 16 does not necessarily need to be a generator, For example, things other than generators, such as a natural refrigerant heat pump type hot water heater which collects atmospheric heat and heats water, may be used. In short, the 1st hot water supply unit 16 should just be a hot water storage type hot water supply unit which has the heating part which heats water, and the hot water storage tank which stores the heated water as hot water.

  (9) In the above embodiment, the hot water supply system of the present invention is applied to a two-family house where a child household and a parent household reside. However, the present invention is applied to an apartment house such as an apartment or a condominium having a plurality of (three or more) households. The invention may be applied.

  DESCRIPTION OF SYMBOLS 10 ... Housing, 11 ... 1st household, 12 ... 2nd household, 13 ... 1st hot-water supply path, 14 ... 2nd hot-water supply path, 15 ... 1st hot-water supply pipe, 16 ... 1st hot-water supply unit, 17 ... 1st hot-water supply pipe , 21 ... Fuel cell unit as heating unit, 22 ... Hot water storage tank, 23 ... Backup boiler, 25 ... Second water supply pipe, 26 ... Second hot water supply unit, 27 ... Second hot water supply pipe, 28 ... Hot water storage information acquisition means A tank hot water temperature sensor, 31 ... a hot water supply pipe, 33 ... a flow rate adjustment valve as a flow rate adjustment unit, 35 ... a flow rate sensor as a flow rate detection means, 40 ... a controller as a control means.

Claims (5)

A first hot water supply path for supplying hot water to the first household;
A second hot water supply path for supplying hot water to the second household,
The first hot water supply path is:
A first hot water supply unit having a heating section for heating water supplied from the first water supply pipe, a hot water storage tank for storing the heated water as hot water, and a backup boiler;
A first hot water supply pipe for supplying hot water stored in the hot water storage tank to the first household;
The first hot water supply unit heats hot water stored in the hot water storage tank as needed by the backup boiler and supplies the hot water to the first household.
The second hot water supply path is
A second hot water supply unit comprising a gas water heater for heating the water supplied from the second water supply pipe to generate hot water;
A second hot water supply pipe for supplying hot water generated by the second hot water supply unit to the second household;
A hot water pipe for guiding hot water from the first hot water pipe to the second hot water pipe;
A flow rate adjusting unit for adjusting a flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe through the hot water supply pipe;
Hot water storage information acquisition means for acquiring hot water storage information that is information on at least one of the temperature and amount of hot water stored in the hot water storage tank;
Control means for controlling the flow rate adjusting unit to adjust the flow rate of hot water introduced from the first hot water supply pipe to the second hot water supply pipe based on the acquired hot water storage information;
A hot water supply system for a multi-family house. The first hot water supply unit supplies hot water to the first household at a predetermined hot water supply temperature,
Based on hot water storage information acquired by the hot water storage information acquisition means, comprising hot water supply capacity calculation means for calculating the maximum flow rate of hot water that can be supplied from the first hot water supply unit at the hot water supply temperature,
The control means adjusts the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe by the flow rate adjusting unit based on the maximum flow rate calculated by the hot water supply capacity calculating means. The hot water supply system for a multi-family house according to claim 1. A flow rate detecting means for detecting a flow rate of hot water supplied from the first hot water supply unit to the first household;
Based on the maximum flow rate calculated by the hot water supply capacity calculation means and the flow rate of hot water detected by the flow rate detection means, the first hot water supply unit and the hot water supply pipe pass through the first hot water supply pipe and the hot water supply pipe. An allowable value calculating means for calculating a maximum value of the flow rate of hot water that can be supplied to the second water supply pipe as a flow allowable value;
The said control means adjusts the flow volume of the hot water introduce | transduced into the said 2nd water supply pipe | tube from the said 1st hot water supply pipe | tube by the said flow volume adjustment part so that it may become the said flow volume allowable value or less. Hot water supply system for multi-family houses. The control means is configured so that a temperature of mixed water obtained by mixing hot water introduced from the first hot water supply pipe into the second water supply pipe and water of the second water supply pipe becomes a predetermined target temperature. In addition, a temperature control process for adjusting the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe by the flow rate adjusting unit is performed.
The multi-household according to claim 3, wherein the temperature control process is performed in a range in which a flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe does not exceed the allowable flow rate. Residential hot water supply system. A first hot water supply path for supplying hot water to the first household;
A second hot water supply path for supplying hot water to the second household,
The first hot water supply path is:
A first hot water supply unit having a heating section for heating water supplied from the first water supply pipe, a hot water storage tank for storing the heated water as hot water, and a backup boiler;
A first hot water supply pipe for supplying hot water stored in the hot water storage tank to the first household;
The first hot water supply unit heats hot water stored in the hot water storage tank as needed by the backup boiler and supplies the hot water to the first household.
The second hot water supply path is
A second hot water supply unit comprising a gas water heater for heating the water supplied from the second water supply pipe to generate hot water;
A second hot water supply pipe for supplying hot water generated by the second hot water supply unit to the second household;
A hot water pipe for guiding hot water from the first hot water pipe to the second hot water pipe;
A flow rate adjusting unit for adjusting a flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe through the hot water supply pipe;
A flow rate detecting means for detecting a flow rate of hot water supplied from the first hot water supply unit to the first household;
Control means for controlling the flow rate adjusting unit to adjust the flow rate of hot water introduced from the first hot water supply pipe to the second water supply pipe based on the flow rate of hot water detected by the flow rate detection means;
A hot water supply system for a multi-family house.

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