JP2014102042A - Hot-water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water supply system which enables a general hot-water supply route to be bifurcated into two hot-water supply routes and can simultaneously supply hot water at different temperatures to respective hot-water supply routes.SOLUTION: A hot-water supply system controls: a hot-water circulation pump P1 on the basis of a temperature of a main hot-water temperature sensor T6 so that a temperature of hot water is adjusted to a set temperature of a main hot-water supply terminal 60; and an opening of a sub hot-water mixing valve 54 on the basis of the temperature of a sub hot-water temperature sensor T7 so that the temperature of the hot water is adjusted to the set temperature of a sub hot-water supply terminal 70. The hot-water supply system also controls: the hot-water circulation pump P1 on the basis of the temperature of the sub hot-water temperature sensor T7 so that the temperature of the hot water is adjusted to the set temperature of the sub hot-water supply terminal 70; and the opening of a main hot-water mixing valve 53 on the basis of the main hot-water temperature sensor T6 so that the temperature of the hot water is adjusted to the set temperature of the main hot-water supply terminal 60.

Description

  The present invention relates to a hot water supply system including a tank type hot water supply machine.

  Conventionally, various tank-type water heaters have been proposed that have one bathtub hot water supply path (hot water path) for supplying hot water to the bathtub terminal and one general hot water supply path for supplying hot water to the general hot water terminal (for example, , See Patent Document 1).

JP 2011-242088 A

  However, in the above-described conventional water heater, one path for supplying hot water to the bathtub terminal and one path for supplying hot water to the general hot water terminal (including kitchen, washroom, toilet, etc.) are provided for one water heater. Yes, it was not possible to branch the general hot water supply terminal into two paths and control each path at different temperatures. For example, in a two-family house, it is required to make the hot water temperature used by a child household different from the hot water temperature used by a parent household.

  The present invention provides a hot water supply system capable of branching a general hot water supply path into two hot water supply paths and simultaneously supplying hot water to the respective hot water supply paths at different temperatures.

  A first invention is a tank for storing a heat medium, a heating means for heating the heat medium in the tank, a hot water supply heat exchange for exchanging heat between a high-temperature heat medium taken out of the tank and low-temperature water at a lower temperature than that. A hot water circulation pump that circulates the high-temperature heat medium between the hot water supply heat exchanger and the tank, a general hot water supply path for supplying hot water to a general hot water supply terminal, a bathtub hot water supply path for supplying hot water to a bathtub terminal, A hot water supply device including the first hot water temperature set at the first hot water supply terminal and a second hot water supply temperature set at the second hot water terminal pass through the general hot water supply path. A distribution unit that distributes the hot water by branching to a second flow path that flows, wherein the distribution unit mixes at least the hot water flowing through the first flow path and the low-temperature water. A hot water supply mixing valve, hot water flowing through the second flow path, and the low A second hot water supply mixing valve for mixing water, a first temperature detecting means for detecting a first temperature of hot water flowing through the first flow path, and a second temperature of the hot water flowing through the second flow path. And a second temperature detecting means for detecting the hot water circulation pump or the first hot water supply mixing valve so as to be the first hot water supply temperature based on the first temperature, and the second temperature detecting means Control means for controlling the hot-water supply circulation pump or the second hot-water supply mixing valve so that the temperature becomes 2 hot-water supply temperatures.

  The second invention is a tank for storing a heat medium, a heating means for heating the heat medium in the tank, a hot water supply mixing valve for mixing a high-temperature heat medium taken out from the tank and low-temperature water having a temperature lower than that, A water heater including a pressure reducing valve for reducing the low-temperature water introduced to the hot water mixing valve to a predetermined pressure, a general hot water supply path for supplying hot water to a general hot water supply terminal, and a bathtub hot water supply path for supplying hot water to a bathtub terminal; A first flow path through which hot water having a first hot water temperature set in the first hot water supply terminal flows and a second flow path through which hot water having a second hot water temperature set in the second hot water terminal pass through the general hot water supply path. A distribution unit that distributes the hot water by branching to the first flow path, and the distribution unit mixes at least the hot water flowing through the first flow path and the low-temperature water reduced to the predetermined pressure. 1 hot water mixing valve, hot water flowing through the second flow path and the place A second hot-water supply mixing valve for mixing the low-temperature water whose pressure has been reduced to a pressure, a first temperature detecting means for detecting a first temperature of hot water flowing through the first flow path, and a flow through the second flow path. Second temperature detecting means for detecting a second temperature of flowing hot water, controlling the hot water supply circulation pump or the first hot water supply mixing valve so as to be the first hot water supply temperature based on the first temperature; Control means for controlling the hot-water supply circulation pump or the second hot-water supply mixing valve so as to reach the second hot-water supply temperature based on two temperatures.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water supply system which can branch a general hot water supply path into two hot water supply paths, and can supply hot water to each hot water supply path simultaneously at different temperature can be provided.

It is a whole lineblock diagram showing the hot-water supply system concerning a 1st embodiment. It is a flowchart explaining operation | movement of the hot water supply system which concerns on 1st Embodiment. It is a flowchart explaining operation | movement of the hot water supply system which concerns on 1st Embodiment. It is a whole lineblock diagram showing the hot-water supply system concerning a 2nd embodiment. It is a whole block diagram which shows the hot water supply system which concerns on 3rd Embodiment. It is a whole block diagram which shows the hot water supply system which concerns on 4th Embodiment.

(First embodiment)
Hereinafter, the hot water supply system according to the first embodiment will be described in detail with reference to FIGS. 1 to 3. FIG. 1 is an overall configuration diagram showing a hot water supply system according to the first embodiment, and FIGS. 2 and 3 are flowcharts for explaining the operation of the hot water supply system according to the first embodiment. First, the overall configuration of the hot water supply system 100A will be described with reference to FIG. This embodiment is applied to, for example, a two-family house (a child household on the first floor, a parent household on the second floor), the main remote controller R1 is provided in the kitchen on the first floor, and the sub remote controller R3 is provided on the second floor. Will be described as an example.

  As shown in FIG. 1, a hot water supply system 100A includes a hot water heater 1A, a distribution unit 50A, a main hot water supply terminal 60 (first hot water supply terminal), a sub-hot water supply terminal 70 (second hot water supply terminal), and a bathtub 80 (tub terminal). It consists of The first embodiment is a case where the water heater 1A and the distribution unit 50A are configured separately and the distribution unit 50A is provided outside the water heater 1A.

  The hot water heater 1A includes a hot water storage unit 2, a heat pump unit 3 (heating means), and a control device 4A. Note that the main remote controller (kitchen remote controller) R1, the bath remote controller R2, and the sub remote controller R3 are also included in the water heater 1A.

  The hot water storage unit 2 includes a hot water storage tank 11 (tank) for holding hot water (heat medium), a general hot water supply path 20, and a bathtub hot water supply path 30. The hot water storage unit 2 is accommodated in a square box type case (not shown) with the hot water storage tank 11 covered with a heat insulating material, and a general hot water supply path 20 is formed in a gap between the inner wall of the case and the hot water storage tank 11. And the piping, valve, etc. which comprise the bathtub hot-water supply path | route 30 are arrange | positioned and comprised. In addition, 50 A of distribution units are arrange | positioned in the vicinity of the case (not shown) in which the hot water storage unit 2 is accommodated, for example, and are connected with the hot water storage unit 2 via required piping.

  The heat pump unit 3 is used for boiling water taken out from the lower part of the hot water storage tank 11 and can be constituted by a known technique. For example, the heat pump unit 3 includes a compressor that compresses a refrigerant (for example, carbon dioxide) to a high temperature and a high pressure, and a condenser that heats water (low temperature water) from the hot water storage tank 11 with a high temperature refrigerant from the compressor. (Water heat exchanger), a decompression device that expands (depressurizes) the refrigerant from the condenser, and an evaporator (air heat exchanger) that absorbs heat in the atmosphere and evaporates the refrigerant. ing.

  The hot water storage tank 11 is made of a material such as stainless steel, for example, by combining three members of a cylindrical body plate, an upper end plate covering an upper opening of the body plate, and a lower end plate covering a lower opening of the body plate. Composed.

  The lower part of the hot water storage tank 11 is connected to the inlet 3a of the heat pump unit 3 through the pipe 12a. The outlet 3b of the heat pump unit 3 is connected to the upper part of the hot water storage tank 11 via a pipe 12b. In addition, a three-way valve 13 is provided in the middle of the pipe 12a, and a pipe 12c branched from the middle of the pipe 12b is connected to the three-way valve 13 to constitute a flow path that bypasses the hot water storage tank 11.

  Incidentally, the temperature of the hot water in the hot water storage tank 11 is, for example, a relatively low temperature, medium temperature, and high temperature distribution from the lower part to the upper part of the hot water storage tank 11, and the temperature of the entire hot water in the hot water storage tank 11 is high. become. In addition, although high temperature water (high temperature water, high temperature heat medium) means the thing of the temperature range of 65 to 90 degreeC, for example, it is not limited to an above described temperature range.

  Thereby, the hot water (for example, low temperature water) taken out from the lower part of the hot water storage tank 11 is heated by the heat pump unit 3 via the pipe 12a to become hot water (for example, high temperature water), and then via the pipe 12b. Hot water is stored in the hot water storage tank 11 from the upper part of the hot water storage tank 11.

  Further, in the hot water storage tank 11, a plurality of tank temperature sensors T1 for detecting the temperature of the hot water stored in the vertical direction (the vertical direction in FIG. 1) are arranged at intervals from the upper part to the lower part. A detection signal indicating the temperature of the hot water in the hot water storage tank 11 detected by the tank temperature sensor T1 is output to the control device 4A and used for various controls of the hot water supply system 100A.

  In addition, a hot water supply pipe 15 is connected to the upper part of the hot water storage tank 11 to take out the high temperature water and return it to the lower part of the hot water storage tank 11 via the hot water supply heat exchanger 17. The hot water supply pipe 15 is provided with a hot water supply heat exchanger 17, a hot water supply circulation pump P1, and a check valve CV3 in order from the upstream side. The hot water supply pipe 15 is connected between a lower part of the hot water storage tank 11 and a check valve CV3 by branching a drain pipe 15a having a drain valve (not shown). The hot water supply pipe 15 is connected to a pipe 15b provided with a relief valve (not shown) for maintaining the pressure in the hot water storage tank 11 at a predetermined pressure between the upper part of the hot water storage tank 11 and the hot water supply heat exchanger 17. Has been.

  In addition, a water supply pipe 14 connected to a water supply source (water supply) is connected to the lower part of the hot water storage tank 11. In addition, as a water supply source, it is not limited to a tap water, Well water etc. may be sufficient.

  The water supply pipe 14 is provided with a strainer ST, a check valve CV1, a pressure reducing valve RV, and a check valve CV2 in order from the upstream side. Further, the water supply pipe 14 is provided with a water supply temperature sensor T2 between the check valve CV1 and the pressure reducing valve RV. Further, the water supply pipe 14 branches in the middle of the upstream of the strainer ST, and is connected to the distribution unit 50A, the main hot water supply terminal 60, and the sub hot water supply terminal 70.

  Further, the water supply pipe 14 branches between the water supply temperature sensor T2 and the pressure reducing valve RV and is connected to an inlet on the secondary side (side receiving heat) of the hot water supply heat exchanger 17 described later. Further, the water supply pipe 14 is connected with a water supply pipe 35 which will be described later in a branched manner between the pressure reducing valve RV and the check valve CV2.

  The general hot water supply path 20 is used to supply hot water to a general hot water supply terminal (main hot water supply terminal 60, sub hot water supply terminal 70) such as a faucet or a shower in the kitchen, washroom, bath room, etc., and is completed by using the supplied hot water once. It means that the usage form.

  Moreover, the general hot water supply path 20 is a direct water supply type that supplies tap water from the water supply pipe 14 to a general hot water supply terminal (main hot water supply terminal 60, sub hot water supply terminal 70) without reducing the pressure with a pressure reducing valve. A hot water supply pipe 21 connected to the outlet on the secondary side (side receiving heat) of the heat exchanger 17 is provided. The hot water supply pipe 21 is provided with an accumulator 22, and a hot water supply temperature sensor T3 and a hot water supply flow rate sensor FS1 are provided between the hot water supply heat exchanger 17 and the accumulator 22. The hot water supply pipe 21 communicates with the outside of the hot water heater 1A through the outlet 20a.

  The hot water supply heat exchanger 17 heats the tap water (low temperature water) supplied from the water supply pipe 14 by exchanging heat with high temperature water taken out from the upper part of the hot water storage tank 11. The temperature of the high-temperature water heat-exchanged by the hot-water supply heat exchanger 17 decreases and returns from the lower part of the hot water storage tank 11 to the hot water storage tank 11.

  The hot water supply circulation pump P1 controls the rotational speed of the motor of the hot water supply circulation pump P1 so as to be the hot water supply temperature set by the main remote controller R1 (bath remote control R2) based on the hot water supply temperature detected by the hot water supply temperature sensor T3 ( Increase, decrease). In addition, it is detected by the hot water supply flow sensor FS1 that hot water supply is started from the general hot water supply terminal.

  The bathtub hot water supply path 30 has a hot water circuit 31 for hot water filling the bathtub 80 and a chasing circuit 41 for chasing the bathtub water stored in the bathtub 80.

  The hot water beam circuit 31 has a bath pipe 33, one end of the bath pipe 33 is connected to one of the adapters 80 a of the bathtub 80, and the other end is between the hot water storage tank 11 of the hot water supply pipe 15 and the hot water supply heat exchanger 17. It is connected. In the bath piping 33, a second bath mixing valve V2, a first bath mixing valve V1, a bath electromagnetic valve V3, a check valve CV4, and a check valve CV5 are provided in this order from the upstream side during hot water filling. Also, the bath pipe 33 is provided with a bath flow sensor FS2 between the check valve CV4 and the check valve CV5. Further, a backflow prevention device 34 for preventing a backflow from the secondary side (tub 80 side) to the primary side (hot water storage tank 11 side) is connected to the bath pipe 33. Further, a bottom return temperature sensor T4, a water level sensor LS, and a water flow switch FSW are provided in order from the upstream side in the bottom piping 33 on the downstream side of the check valve CV5.

  The water flow switch FSW is a switch provided with a mechanism that outputs an ON signal when a fluid (for example, bath water) flows, and turns OFF when the fluid does not flow. The ON signal at this time is output to the control device 4A. The water level sensor LS has a function of detecting the water level of the bathtub 80.

  The first bath mixing valve V1 is set by the bath remote control R2 by controlling the mixing ratio of the hot water from the hot water storage tank 11 and the water (cold water) from the water supply pipe 35 decompressed by the pressure reducing valve RV. The temperature is controlled to be the bath temperature. The water supply pipe 35 is provided with a check valve CV6.

  The second bath mixing valve V <b> 2 controls the mixing ratio between the high temperature water from the hot water storage tank 11 and hot water (for example, medium temperature water) taken out from the intermediate extraction pipe 36 connected to the middle of the hot water storage tank 11. The efficiency (COP: Coefficient Of Performance) of the heat pump unit 3 can be improved by actively taking out and reducing the medium temperature water during hot water filling.

  The bath solenoid valve V3 is an electromagnetically operated ON / OFF valve (shutoff valve) that is opened when the hot water is poured.

  As described above, in the hot water beam circuit 31, by directly using the hot water in the hot water storage tank 11, the thermal efficiency can be improved as compared with the case of supplying hot water by heat exchange.

  The chase circuit 41 is configured by connecting one end of a pipe 43 to the introduction port 42a of the chase heat exchanger 42 and connecting one end of the pipe 44 to the outlet port 42b. The other end of the pipe 43 is connected to one outlet port of the circulation adjustment valve V4.

  The follow-up heat exchanger 42 is configured by being wound in a coil shape, and is disposed in the upper part of the hot water storage tank 11 and bath water flowing in the follow-up heat exchanger 42 and the hot water storage tank 11. Heat exchange with hot water (hot water).

  The circulation adjustment valve V4 has a function of adjusting the flow rate to the piping 45 side (side bypassing the follow-up heat exchanger 42) and the flow rate to the follow-up heat exchanger 42 side by adjusting the opening degree. doing.

  The other outlet port of the circulation adjustment valve V4 is connected to the other end of the adapter 80a of the bathtub 80 through the pipe 45. The introduction port of the circulation adjustment valve V4 is connected between the check valve CV5 of the bath pipe 33 and the bath return temperature sensor T4 via the pipe 46. The pipe 46 is provided with a bath circulation pump P2 for discharging bathtub water (or hot water from the hot water storage tank 11 side) toward the circulation adjustment valve V4. The other end of the pipe 44 is connected to the pipe 45. The pipe 44 is provided with a tracking temperature sensor T5.

  In the present embodiment, the case where the tracking circuit 41 includes the tracking heat exchanger 42 has been described as an example. However, the present invention is not limited to this, and the tracking circuit 41 is replaced with the tracking heat exchanger 42. It may be provided with another heating device such as a heater.

  Note that the check valves CV1 to CV6 shown in FIG. 1 are valves that allow only the flow in the direction indicated by the arrow in the drawing (the same applies to FIGS. 4, 5, and 6).

  The control device 4A includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface, and the like, and various operation signals from the main remote controller R1, the sub-remote controller R3, and the bottom remote controller R2. The tank internal temperature (detection value) detected by each tank temperature sensor T1, the feed water temperature sensor T2, the hot water supply temperature sensor T3, the return temperature sensor T4, and each temperature (detection value) detected by the follow-up temperature sensor T5, Each flow rate (detected value) from the hot water supply flow rate sensor FS1 and the bath flow rate sensor FS2, the ON signal from the water flow switch FSW, and the water level of the bathtub 80 from the water level sensor LS are acquired. Further, the control device 4A controls the first bath mixing valve V1, the second bath mixing valve V2, the bath electromagnetic valve V3, the circulation adjusting valve V4, the hot water supply circulation pump P1, and the bath circulation pump P2. In FIG. 1, illustration of signal lines and control lines electrically connected to the control device 4A is omitted (the same applies to FIGS. 4 to 6 described later).

  In the bathtub hot water supply path 30 configured as described above, during the hot water operation, the control device 4A opens the bath electromagnetic valve V3 and the first bath mixing so that the bath temperature set by the bath remote control R2 is reached. The mixing ratio of each of the valve V1 and the second bath mixing valve V2 is controlled. During hot water operation, the high temperature water in the upper part of the hot water storage tank 11 is not necessarily required. Therefore, the intermediate temperature water is taken out from the intermediate extraction pipe 36 of the hot water storage tank 11 and the hot water in the hot water storage tank 11 is taken out. Are mixed at a predetermined mixing ratio in the second bath mixing valve V2.

  And the hot water mixed by the 2nd bath mixing valve V2 is mixed with the tap water from the water supply pipe 35 in the 1st bath mixing valve V1. The hot water mixed by the first bath mixing valve V1 is supplied to the bathtub 80 from one end of the adapter 80a through a part of the bath piping 33, and the bath circulation pump P2 is driven to pass through the piping 46, 45. It is supplied to the bathtub 80 from the other side of the adapter 80a. Thereby, the time required for hot water can be shortened. Whether or not a predetermined amount of hot water (the amount set by the bath remote controller R2) has been supplied to the bathtub 80 is determined by the control device 4A detecting the flow rate of the bath flow sensor FS2. Then, the control device 4A closes the bath solenoid valve V3 after supplying a predetermined amount of hot water.

  Further, during the follow-up operation, the bath circulation pump P2 is driven by the control device 4A, and the hot water in the bathtub 80 becomes a part of the bath pipe 33, the circulation adjustment valve V4, the pipe 43, the follow-up heat exchanger 42, and the pipe 44. Then, a part of the pipe 45 is sequentially passed back to the bathtub 80. Further, the control device 4A controls the flow rate from the circulation adjusting valve V4 to the pipe 43 and the flow rate to the pipe 45 based on the temperature of the tracking temperature sensor T5.

  By the way, when chasing, the temperature of the hot water in the hot water storage tank 11 is lowered to generate intermediate temperature water. When the intermediate temperature water (for example, hot water of about 50 ° C.) is boiled by the heat pump unit 3, it is efficiently produced. It is not preferable. Therefore, the efficiency (COP: Coefficient Of Performance) of the heat pump unit 3 can be improved by actively taking out the medium temperature water during hot water operation and reducing the amount of medium temperature water in the hot water storage tank 11.

  The main remote controller R1 can set the hot water temperature supplied from the main hot water supply terminal 60, and includes an operation unit (not shown) for setting the hot water temperature, a display unit (not shown) for displaying the set hot water temperature, and the like. . Note that the hot water supply temperature set by the main remote controller R1 corresponds to the set temperature (first hot water supply temperature) of the main remote controller R1.

  The bath remote controller R2 can set the bath hot water temperature to be supplied to the bathtub 80, and includes an operation unit (not shown) for setting the bath hot water temperature, a display unit (not shown) for displaying the set bath hot water temperature, and the like. . The bath remote controller R2 can also set the hot water temperature supplied from the main hot water supply terminal 60.

  The sub remote controller R3 can set the hot water temperature supplied from the sub hot water supply terminal 70, and includes an operation unit (not shown) for setting the hot water temperature, a display unit (not shown) for displaying the set hot water temperature, and the like. . It should be noted that the hot water temperature set by sub remote controller R3 corresponds to the set temperature (second hot water temperature) of sub remote controller R3.

  As shown in FIG. 1, distribution unit 50 </ b> A is connected between hot water heater 1 </ b> A, main hot water supply terminal 60, and sub hot water supply terminal 70. That is, when the distribution unit 50A is not required, that is, when hot water is supplied from both the main hot water supply terminal 60 and the sub hot water supply terminal 70, the main hot water supply terminal 60 and the sub hot water supply terminal 70 are connected to the hot water heater 1A. By simply connecting the hot water supply pipe 21 of the path 20 via a branch pipe (not shown), it can be used as a normal hot water supply system. Since the distribution unit 50A is not attached, the initial cost (initial investment cost) can be kept low.

  Further, when the distribution unit 50A is required, that is, when hot water is supplied from the main hot water supply terminal 60 and the sub hot water supply terminal 70, it is easy to connect the distribution unit 50A to the water heater 1A as an option. It can correspond to. In this way, by configuring the distribution unit 50A separately from the water heater 1A (by disposing the distribution unit 50A outside the water heater 1A), the user can easily switch to the usage mode desired by the user. it can. Details of the distribution unit 50A will be described below with reference to FIG.

  The distribution unit 50A includes a hot water supply branch pipe 51, a water supply branch pipe 52, a main hot water supply mixing valve 53 (first hot water supply mixing valve), and a sub hot water supply mixing valve that branch the general hot water supply path 20 (one hot water supply pipe 21) into two paths. 54 (second hot water supply mixing valve), main hot water supply pipe 55, sub hot water supply pipe 56, control device 57, main hot water supply temperature sensor T6 (first temperature detection means), main hot water supply flow rate sensor FS3 (first flow rate detection means), sub A hot water supply temperature sensor T7 (second temperature detection means) and a sub-hot water supply flow rate sensor FS4 (second flow rate detection means) are included.

  The hot water supply branch pipe 51 includes a hot water supply introduction pipe 51a connected to the outlet 20a of the general hot water supply path 20 of the water heater 1A, a main hot water supply branch pipe 51b that branches from the hot water supply introduction pipe 51a to the main hot water supply terminal 60, and hot water introduction. A sub hot water supply branch pipe 51c that branches from the pipe 51a to the sub hot water supply terminal 70 side.

  The water supply branch pipe 52 includes a water supply introduction pipe 52a connected to the outlet 14b of the water supply pipe 14a branched from the water supply pipe 14 of the water heater 1A, and a main water supply branch pipe branched from the water supply introduction pipe 52a to the main hot water supply terminal 60 side. 52b and a sub water supply branch pipe 52c that branches from the water supply introduction pipe 52a to the sub hot water supply terminal 70 side.

  In the main hot water supply mixing valve 53, one introduction port is connected to the main hot water supply branch pipe 51b, and the other introduction port is connected to the main hot water branch pipe 52b. The hot water from the main hot water branch pipe 51b and the main hot water branch pipe 52b are connected. The control unit 57 controls the mixing ratio with the water (cold water) from the hot water supply temperature set by the main remote controller R1.

  In the sub hot water supply mixing valve 54, one introduction port is connected to the sub hot water supply branch pipe 51c, the other introduction port is connected to the sub water supply branch pipe 52c, and the hot water from the sub hot water branch pipe 51c and the sub water supply branch pipe 52c. The control unit 57 controls the mixing ratio with water from the water (low temperature water) to be the hot water supply temperature set by the sub remote controller R3.

  One end of the main hot water supply pipe 55 is connected to the outlet port of the main hot water supply mixing valve 53, and the other end is connected to a pipe 60 a connected to the main hot water supply terminal 60. The main hot water supply terminal 60 is connected to a pipe 60b branched from a water supply branch pipe 14c connected to the water supply pipe 14.

  One end of the sub hot water supply pipe 56 is connected to the outlet port of the sub hot water supply mixing valve 54, and the other end is connected to a pipe 70 a connected to the sub hot water supply terminal 70. In addition, a pipe 70b branched from the water supply branch pipe 14c is connected to the sub-hot water supply terminal 70.

  The main hot water supply temperature sensor T6 detects the hot water supply temperature (first temperature) after hot water and water are mixed by the main hot water supply mixing valve 53, and is provided in the main hot water supply pipe 55 on the downstream side of the main hot water supply conjoint valve 53. It has been.

  The main hot water supply flow rate sensor FS3 detects the hot water supply flow rate (first flow rate) after the hot water and water are mixed by the main hot water supply mixing valve 53, and is provided downstream of the main hot water supply temperature sensor T6 in the main hot water supply pipe 55. It has been. The control device 57 to be described later determines that hot water is being supplied from the main hot water supply terminal 60 when the detection value (flow rate ≠ 0) is acquired from the main hot water supply flow rate sensor FS3.

  The sub hot water temperature sensor T7 detects the hot water temperature (second temperature) after the hot water and water are mixed by the sub hot water mixing valve 54, and is provided in the sub hot water supply pipe 56 on the downstream side of the sub hot water mixing valve 54. It has been.

  The sub hot water flow rate sensor FS4 detects the hot water flow rate (second flow rate) after the hot water and water are mixed by the sub hot water mixing valve 54, and is provided downstream of the sub hot water temperature sensor T7 in the sub hot water supply pipe 56. It has been. The control device 57 to be described later determines that hot water is being supplied from the sub hot water supply terminal 70 when the detection value (flow rate ≠ 0) is acquired from the sub hot water supply flow rate sensor FS4.

  The control device 57 includes a CPU, a ROM, a RAM, an input / output interface, and the like, controls the main hot water supply mixing valve 53 and the sub hot water supply mixing valve 54, and detects temperatures (detection) from the main hot water supply temperature sensor T6 and the sub hot water supply temperature sensor T7. Value), the flow rate (detected value) from the main hot water supply flow rate sensor FS3 and the sub hot water supply flow rate sensor FS4.

  The control device 57 includes a communication unit that communicates with the control device 4A. When the distribution unit 50A is connected to the water heater 1A and the control device 4A and the control device 57 are connected, the distribution unit 50A is connected. A signal (such as a flag) indicating that the operation has been performed is transmitted to the control device 4A. Further, control device 57 outputs a signal consisting of each temperature (each detected value) of main hot water supply temperature sensor T6 and sub hot water supply temperature sensor T7, and each flow rate (each detected value) of main hot water supply flow rate sensor FS3 and sub hot water supply flow rate sensor FS4. Transmit to the control device 4A. Control device 4A that has received the signal from control device 57 transmits a signal for controlling main hot water supply mixing valve 53 and sub-hot water supply mixing valve 54. In this way, the distribution ratio of hot water and water of the main hot water supply mixing valve 53 and the sub hot water supply mixing valve 54 is controlled based on the information sent from the distribution unit 50A to the hot water heater 1A.

  Further, the control device 57 mixes the main hot water supply so as to be the hot water supply temperature (set temperature) set by the main remote controller R1, based on the temperature (hot water supply temperature, first hot water supply temperature) detected by the main hot water supply temperature sensor T6. The valve 53 is controlled. In addition, when the temperature of hot water falls from the distribution unit 50A to the main hot water supply terminal 60 due to heat radiation from the pipe 60a when hot water flows through the pipe 60a, the temperature detected by the main hot water supply temperature sensor T6 is The main hot water supply mixing valve 53 is controlled by the control device 57 so as to reach a temperature obtained by adding a temperature drop (α) to the set temperature of the main remote controller R1.

  Similarly, control device 57 uses the sub hot water supply temperature (set temperature) set by sub remote controller R3 based on the temperature (hot water supply temperature, second hot water supply temperature) detected by sub hot water supply temperature sensor T7. The mixing valve 54 is controlled. In addition, when the temperature of hot water decreases from the distribution unit 50A to the sub hot water supply terminal 70 due to heat radiation from the pipe 70a when hot water flows through the pipe 70a, the temperature detected by the sub hot water supply temperature sensor T7 is The sub hot water supply mixing valve 54 is controlled by the control device 57 so as to reach a temperature obtained by adding the temperature drop (β) to the set temperature of the sub remote controller R3.

  2 and 3 are flowcharts for explaining the operation of the hot water supply system according to the first embodiment. In the following description, for example, the case where the kitchen remote controller installed in the kitchen is the main remote controller R1 will be described as an example. However, instead of the kitchen remote controller, the bath remote controller R2 capable of setting the hot water supply temperature of a general hot water supply terminal is used as the main remote controller. It is good.

  As shown in FIG. 2, when the hot water supply of only the main hot water supply terminal 60, only the sub hot water supply terminal 70, or both the main hot water supply terminal 60 and the sub hot water supply terminal 70 is started, the control device 4A It is determined whether 50A (control device 57, control board) is connected to water heater 1A.

  In step S1, when the controller 4A determines that the distribution unit 50A is not connected to the water heater 1A (No), when the flow rate (≠ 0) is detected by the hot water supply flow sensor FS1 of the water heater 1A. In addition, it is determined that the hot water supply is started from the main hot water supply terminal 60 and / or the sub hot water supply terminal 70.

  In step S1, if the controller 4A determines that the distribution unit 50A is connected to the hot water heater 1A (Yes), the flow rate (≠ 0) is detected by the main hot water supply flow rate sensor FS3. When it is determined that the hot water supply of the main hot water supply terminal 60 is started and the flow rate (≠ 0) is detected by the sub hot water supply flow rate sensor FS4, it is determined that the hot water supply of the sub hot water supply terminal 70 is started, and the main hot water supply flow rate sensor FS3. When the flow rate (≠ 0) is detected by both the hot water supply flow sensor FS4 and the sub hot water supply flow sensor FS4, it is determined that the hot water supply of both the main hot water supply terminal 60 and the sub hot water supply terminal 70 has started.

  In Step S1, when it is determined that the distribution unit 50A is not connected (No), the control device 4A proceeds to Step S2. When the distribution unit 50A is not connected to the water heater 1A, the control device 4A cannot communicate with the control device 57 of the distribution unit 50A, so it is determined that the distribution unit 50A is not connected.

  In step S2, control device 4A determines whether or not the hot water supply temperature is the same as the set temperature. The hot water supply temperature is a temperature detected by a hot water supply temperature sensor T3. The set temperature is a temperature last set by the main remote controller R1 and the sub remote controller R3 (or the main remote controller R1, the bottom remote controller R2, and the sub remote controller R3). That is, since the distribution unit 50A is not connected, the set temperature of the main remote controller R1 and the set temperature of the sub-remote controller R3 are the same, and the hot water having the same temperature is present in both the main hot water supply terminal 60 and the sub hot water supply terminal 70. Will be supplied. In this case, the rotational speed of the hot water supply circulation pump P1 is set to a temperature set by the main remote control R1 (sub remote control R3) based on the temperature detected by the hot water supply temperature sensor T3 provided in the hot water supply pipe 21. To control.

  In step S2, when it is determined that the hot water supply temperature is the same as the set temperature (Yes), the control device 4A returns, and when it is determined that the hot water supply temperature is different from the set temperature (No), step S3. Proceed to

  In step S3, control device 4A determines whether or not the hot water temperature is higher than the set temperature, and if it is determined that the hot water temperature is higher than the set temperature (Yes), the process proceeds to step S4, where the hot water temperature is the set temperature. If determined to be lower (No), the process proceeds to step S5.

  In step S4, control device 4A decreases the rotational speed of hot water supply circulation pump P1. As the rotational speed of the hot water supply circulation pump P1 decreases, the heat exchange rate between the high temperature water and the low temperature water in the hot water supply heat exchanger 17 decreases, and the hot water supply heat exchanger 17 leads to the general hot water supply path 20 (hot water supply pipe 21). The temperature of the hot water will be lowered.

  In step S5, control device 4A increases the rotational speed of hot water supply circulation pump P1. As the rotational speed of the hot water supply circulation pump P1 increases, the heat exchange rate between the high temperature water and the low temperature water in the hot water supply heat exchanger 17 increases, and the hot water supply heat exchanger 17 leads to the general hot water supply path 20 (hot water supply pipe 21). The temperature of the hot water rises.

  In steps S2 and S3, the determination may be made in consideration of the heat dissipation loss from the pipes 60a and 70a.

  On the other hand, when it is determined in step S1 that the water heater 1A and the distribution unit 50A are connected (Yes), the control device 4A proceeds to step S6. In step S6, control device 4A determines whether or not the set temperature (first hot water temperature) of main remote controller R1 is the same as the set temperature (second hot water temperature) of sub remote controller R3.

  In Step S6, when it is determined that the temperature is the same (Yes), the control device 4A proceeds to Step S7, and when it is determined that the temperature is different (No), the control device 4A proceeds to Step S11 in FIG.

  In step S7, control device 4A determines whether or not the hot water supply temperature (main remote control R1 and sub remote control R3) is the same as (set temperature + α). Note that “+ α” is a temperature that is added in the case of considering a heat dissipation loss in the pipe sections (pipes 60a and 70a). For example, the control device 4A automatically sets “α” to 1 ° C., 2 ° C., 5 ° C., for example, based on the outside air temperature of an outside air temperature sensor (not shown) provided outside the water heater 1A. To calculate. In winter, “α” is set higher, and in summer, “α” is set lower. In this way, by making “α” variable according to the season and the like, it becomes possible to reduce energy consumption (energy saving), compared with the case where “α” is always set to a high value throughout the year.

  In step S7, when controller 4A determines that the hot water supply temperature (main remote control R1 and sub remote control R3) is the same as (set temperature + α), it repeats the process of step S7, and hot water supply temperature (main remote control R1). If it is determined that the sub-remote controller R3) is different from (set temperature + α), the process proceeds to step S8.

  In step S8, control device 4A determines whether or not hot water supply temperature (main remote control R1 and sub remote control R3) is higher than (set temperature + α), and hot water supply temperature (main remote control R1 and sub remote control R3) is set to (set temperature). If it is determined that the temperature is higher than (+ α) (Yes), the process proceeds to step S9. If it is determined that the hot water supply temperature (main remote control R1 and sub remote control R3) is lower than (set temperature + α) (No), step S10 is performed. Proceed to Step S9 is the same as step S4 described above, and step S10 is the same as step S5 described above.

  When the main hot water supply terminal 60 and the sub-hot water supply terminal 70 are used at the same time, more hot water (flow rate) is required than when used at one place, so “α” is used at one place. It is preferable to set larger than the case of doing.

  In step S11 shown in FIG. 3, control device 4A compares the set temperature of main remote controller R1 with the set temperature of sub remote controller R3, and determines whether the set temperature of main remote controller R1 is higher than the set temperature of sub remote controller R3. Determine whether. In step S11, when the control device 4A determines that the set temperature of the main remote controller R1 is higher than the set temperature of the sub-remote controller R3 (Yes), the process proceeds to step S13, where the set temperature of the main remote controller R1 is the sub-remote controller R3. If it is determined that the temperature is lower than the set temperature (No), the process proceeds to step S12.

  In step S13, control device 4A determines whether or not the hot water supply temperature detected by main hot water supply temperature sensor T6 is the same as (set temperature + α) of main remote controller R1. In step S13, when controller 4A determines that the hot water supply temperature is the same as (set temperature + α) of main remote controller R1 (Yes), it repeats the process of step S13, and the hot water supply temperature is ( If it is determined that the temperature is different from the set temperature + α) (No), the process proceeds to step S14.

  In step S14, control device 4A determines whether or not the hot water supply temperature is higher than (set temperature + α) of main remote controller R1. In step S14, when controller 4A determines that the hot water supply temperature is higher than (set temperature + α) of main remote controller R1 (Yes), it proceeds to step S15, and the hot water supply temperature is (set temperature + α) of main remote controller R1. If determined to be lower (No), the process proceeds to step S16. Step S15 is the same as step S4, and step S16 is the same as step S5.

  As described above, when the processes of steps S11, S13, S14, S15, and S16 are executed, when the sub hot water supply terminal 70 is supplying hot water together with the main hot water supply terminal 60, the hot water supply temperature of the sub hot water supply terminal 70 is the main hot water supply temperature. The opening degree of the sub-hot-water supply mixing valve 54 is adjusted so as to be lower than the hot-water supply temperature of the terminal 60, and is controlled to be (set temperature + β (described later)) of the sub-remote controller R3.

  On the other hand, when the set temperature of the sub remote controller R3 is higher than the set temperature of the main remote controller R1 (S11, No), in step S12, the control device 4A determines whether or not the sub hot water supply terminal 70 is currently supplying hot water. In step S12, when control device 4A determines that sub hot water supply terminal 70 is supplying hot water (Yes), it proceeds to step S17. On the other hand, if it is determined that sub hot water supply terminal 70 is not supplying hot water, (No), go to step S13.

  In step S17, control device 4A determines whether or not the hot water temperature detected by sub hot water temperature sensor T7 is the same as (set temperature + β) of sub remote controller R3. “Β” is set in the same manner as “α”. Further, “β” may be set to the same value (temperature difference) as “α” depending on the installation conditions of the main hot water supply terminal 60 and the sub hot water supply terminal 70, and “β” may be set to a value different from “α” ( (Temperature difference) may be set. For example, when the heat dissipation loss in the pipe 70a is larger than the heat dissipation loss in the pipe 60a, “β”> “α” is set. Conversely, the heat dissipation loss in the pipe 60a is larger than the heat dissipation loss in the pipe 70a. In this case, “α”> “β”.

  In step S17, when controller 4A determines that the hot water temperature detected by sub hot water temperature sensor T7 is the same as (set temperature + β) of sub remote controller R3 (Yes), it repeats the process of step S17. If the hot water temperature detected by the sub hot water temperature sensor T7 is different from (set temperature + β) of the sub remote controller R3 (No), the process proceeds to step S18.

  In step S18, control device 4A determines whether or not the hot water temperature detected by sub hot water temperature sensor T7 is higher than (set temperature + β) of sub remote controller R3. In step S18, when controller 4A determines that the hot water temperature detected by sub hot water temperature sensor T7 is higher than (set temperature + β) of sub remote controller R3 (Yes), it proceeds to step S19, and sub hot water temperature is reached. If it is determined that the hot water temperature detected by the sensor T7 is lower than (set temperature + β) of the sub-remote controller R3, the process proceeds to step S20. Step S19 is the same as step S4, and step S20 is the same as step S5.

  As described above, when the processes of steps S11, S12, S17, S18, S19, and S20 are executed, when the main hot water supply terminal 60 is supplying hot water together with the sub hot water supply terminal 70, the hot water supply temperature of the main hot water supply terminal 60 is The opening degree of the main hot water supply mixing valve 53 is adjusted so as to be lower than the hot water supply temperature of the sub hot water supply terminal 70, and is controlled to be (set temperature + α) of the main remote controller R1.

  In step S12, when the sub hot water supply terminal 70 is not supplying hot water (No), only the main hot water supply terminal 60 is supplying hot water, so the process proceeds to step S13, and the hot water supply temperature from the main hot water supply terminal 60 is The rotation speed of the hot water supply circulation pump P1 is controlled so as to be (set temperature + α) of the main remote controller R1 (S13, S14, S15, S16).

  Although not shown in the flow, when the distribution unit 50A is connected and hot water is supplied from the main hot water supply terminal 60, when the flow rate from the main hot water supply flow rate sensor FS3 is determined to be 0, the main hot water supply terminal 60 is provided. It is determined that the hot water supply from has stopped. Further, when hot water is supplied from the sub hot water supply terminal 70, when the flow rate from the sub hot water supply flow sensor FS4 is determined to be 0, it is determined that the hot water supply from the sub hot water supply terminal 70 is stopped.

  As described above, the hot water supply system 100A of the first embodiment includes the hot water storage tank 11 for storing hot water (heat medium), the heat pump unit 3 for heating the hot water in the hot water storage tank 11, and the hot water extracted from the hot water storage tank 11. A general hot water supply path for supplying hot water to the hot water supply heat exchanger 17, the main hot water supply terminal 60 (general hot water supply terminal) and the sub-hot water supply terminal 70 (general hot water supply terminal) for exchanging heat between the (heat medium) and the low-temperature water having a temperature lower than that. 20, a hot water heater 1A including a hot water supply passage 30 for supplying hot water to the bathtub 80, a main hot water supply branch pipe 51b on the main hot water supply terminal 60 side, and a sub hot water supply branch pipe 51c on the sub hot water supply terminal 70 side. A distribution unit 50A for branching and distributing hot water, and the distribution unit 50A is a main unit for mixing hot water flowing through the main hot water supply branch pipe 51b with low-temperature water. A hot water mixing valve 53, a sub hot water mixing valve 54 that mixes hot water flowing through the sub hot water branch pipe 51c and low temperature water, and a main hot water temperature sensor T6 that detects the temperature of hot water flowing through the main hot water branch pipe 51b. And a hot water supply temperature so as to be a set temperature of the main hot water supply terminal 60 based on the temperature detected by the main hot water supply temperature sensor T6 and the temperature detected by the main hot water supply temperature sensor T6. The heat exchange rate in the exchanger 17 and the mixing rate in the main hot water supply mixing valve 53 are controlled, and the hot water supply heat exchanger is set to the set temperature of the sub hot water supply terminal 70 based on the temperature detected by the sub hot water supply temperature sensor T7. And a control means (control device 4A and control device 57) for controlling the heat exchange rate at 17 and the mixing rate of the sub-hot water mixing valve 54.

  According to hot water supply system 100A configured in this manner, the temperature of hot water supplied to main hot water supply terminal 60 and the temperature of hot water supplied to sub hot water supply terminal 70 can be set to different hot water supply temperatures. Become. In other words, until now, only one hot water supply temperature of the set temperature of the main remote controller R1 (set temperature of the remote remote controller R2) or the set temperature of the sub remote controller R3 can be set in the hot water heater 1A. By connecting distribution unit 50A, main hot water supply terminal 60 can supply hot water at the set temperature of main remote control R1, and sub hot water supply terminal 70 can supply hot water at the set temperature of sub remote control R3 (a temperature different from the set temperature of main remote control R1). become able to. Therefore, what can be dealt with at only two temperatures in the conventional hot water supply and the bathtub hot water supply can be handled by the hot water supply system 100A at three temperatures in the general hot water supply and the bathtub hot water supply.

(Second Embodiment)
FIG. 4 is an overall configuration diagram showing a hot water supply system according to the second embodiment. The hot water supply system 100B according to the second embodiment is configured by integrating the hot water heater 1A and the distribution unit 50A according to the first embodiment, in other words, inside the case (not shown) of the hot water storage unit 2. 50B is incorporated and constituted. Moreover, in 2nd Embodiment, the control apparatus 57 in 1st Embodiment is integrated in 4 A of control apparatuses, and it is set as the control apparatus 4B (control means). In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted. The operation of the hot water supply system 100B is the same as that in the first embodiment.

  As shown in FIG. 4, the distribution unit 50 </ b> B is incorporated into the hot water storage unit 2 to form the water heater 1 </ b> B, so that the temperature of hot water supplied to the main hot water supply terminal 60 and the hot water supplied to the sub hot water supply terminal 70 are increased. It is possible to set the temperature and the hot water supply temperature different from each other. In addition, since the control board (corresponding to the control device 57 in the first embodiment) can be configured by a common board with the control device 4B, a plurality of control devices are not required, and as in the first embodiment. In addition, the manufacturing cost can be kept lower than the case where the hot water heater 1A and the distribution unit 50A are separated, and the installation work of the hot water system 100B can be simplified as compared with the case where the distribution unit is separate. Moreover, since the determination that the distribution unit 50B is connected can be made unnecessary, the control can be simplified.

(Third embodiment)
FIG. 5 is an overall configuration diagram showing a hot water supply system according to the third embodiment. The hot water supply system 100C of the third embodiment is a mixing valve type (pressure reducing valve type), and supplies hot water mixed by the hot water supply mixing valve V6 to the general hot water supply terminals (the main hot water supply terminal 60 and the sub hot water supply terminal 70). is there. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The hot water supply system 100C includes a hot water heater 1C, a distribution unit 50C, a main hot water supply terminal 60 (first hot water supply terminal), a sub hot water supply terminal 70 (second hot water supply terminal), and a bathtub 80 (tub terminal). In the third embodiment, the water heater 1C and the distribution unit 50C are configured separately.

  The hot water heater 1C includes a hot water supply pipe 18, a water supply pipe 19, a hot water supply mixing valve V6, check valves CV7, CV8, and the like as a general hot water supply path 20. The hot water supply pipe 21 downstream of the hot water supply mixing valve V6 is the same as the hot water supply pipe 21 downstream of the hot water supply heat exchanger 17 of the first embodiment.

  One end of the hot water supply pipe 18 is connected to the hot water supply pipe 15 connected to the upper part of the hot water storage tank 11, and the other end is connected to one introduction port of the hot water supply mixing valve V6. The hot water supply pipe 18 is provided with a check valve CV7.

  One end of the water supply pipe 19 is connected to the water supply pipe 14 between the lower part of the hot water storage tank 11 and the pressure reducing valve RV1, and the other end is connected to the other introduction port of the hot water supply mixing valve V6. The water supply pipe 19 is provided with a check valve CV8. In this way, water (low temperature water) that has been decompressed to a predetermined value by the decompression valve RV1 flows through the water supply pipe 19. The predetermined value is set based on the pressure resistance of the hot water storage tank 11 and the like.

  The hot water supply mixing valve V6 adjusts the mixing ratio between the hot water (high temperature water) in the upper part of the hot water storage tank 11 and water (low temperature water) and guides it to the general hot water supply path 20 through the outlet port.

  The distribution unit 50C is obtained by adding a pressure reducing valve RV2 to the distribution unit 50A of the first embodiment. The pressure reducing valve RV2 is provided in the water supply introduction pipe 52a of the water supply branch pipe 52, and reduces the water pressure of the water supply source to a predetermined value. The pressure reducing valve RV2 is configured such that the pressure of the water (low temperature water) decompressed by the pressure reducing valve RV2 is equal (substantially equal) to the pressure after the pressure is reduced by the pressure reducing valve RV1. Thereby, since the pressure from the hot water supply pipe 14a can be prevented from becoming higher than the pressure from the hot water supply pipe 21, the hot water supply branch pipe 51 and the hot water supply branch pipe 52 are connected via the main hot water supply mixing valve 53 and the sub hot water supply mixing valve 54. In addition, it is possible to prevent problems such as the reverse flow of water and the supply of only water to the main hot water supply terminal 60 and the sub hot water supply terminal 70.

  Regarding the operation of hot water supply system 100C, in place of steps S4 and S9 shown in FIG. 2 and steps S15 and S19 shown in FIG. 3, the mixing ratio of hot water (high temperature water) introduced from hot water supply pipe 18 into hot water supply mixing valve V6. 2 is performed, and instead of steps S5 and S10 shown in FIG. 2 and steps S16 and S20 shown in FIG. 3, the mixing ratio of hot water (hot water) introduced from the hot water supply pipe 18 to the hot water supply mixing valve V6 is changed. Control to increase is performed. Other operations are the same as those in the first embodiment.

  According to the third embodiment, similarly to the first embodiment, the temperature of hot water supplied to the main hot water supply terminal 60 and the temperature of hot water supplied to the sub hot water supply terminal 70 are set to different hot water supply temperatures. Is possible.

  In the third embodiment, the configuration including the pressure reducing valves RV1 and RV2 has been described as an example. However, the configuration is not limited thereto, and is upstream of the connection point to which the water supply pipe 14a of the water supply pipe 14 is connected. A pressure reducing valve may be provided on the side. Thereby, it can respond with a single pressure-reducing valve. In this case, the strainer ST is arranged on the upstream side of the pressure reducing valve.

(Fourth embodiment)
FIG. 6 is an overall configuration diagram showing a hot water supply system according to the fourth embodiment. A hot water supply system 100D according to the fourth embodiment includes electric heaters 90A and 90B instead of the heat pump unit 3 as a heating unit.

  The hot water supply system 100D includes a hot water heater 1D, a distribution unit 50A, a main hot water supply terminal 60 (first hot water supply terminal), a sub hot water supply terminal 70 (second hot water supply terminal), and a bathtub 80 (tub terminal). In the fourth embodiment, the water heater 1D and the distribution unit 50A are configured separately.

  In the hot water storage tank 11 of the water heater 1D, an electric heater 90A is provided at the lower part, and an electric heater 90B is provided at the upper part. The electric heaters 90A and 90B are composed of a sheathed heater or the like.

  When boiling water (low temperature water) in the hot water storage tank 11, the lower electric heater 90A is turned on by the control device 4A. When the water in the lower part is warmed by the electric heater 90A, it moves to the upper part, and the water moves to the lower part. When convection occurs in the hot water storage tank 11 in this way, the entire water in the hot water storage tank 11 is boiled and becomes high temperature water. When a small amount of hot water is used, the upper electric heater 90B is turned on to heat only the upper portion of the hot water storage tank 11 and use it for hot water supply.

  According to the fourth embodiment, similarly to the first embodiment, the temperature of hot water supplied to the main hot water supply terminal 60 and the temperature of hot water supplied to the sub hot water supply terminal 70 are set to different hot water supply temperatures. Is possible.

  Moreover, according to 4th Embodiment, it can replace with the heat pump unit 3, and can use manufacturing heater 90A, 90B, and can suppress manufacturing cost. Moreover, like the heat pump unit 3, when boiling water is put from the upper part of the hot water storage tank 11, the hot water is cooled. However, the electric heaters 90A and 90B are advantageous in boiling water.

  In addition, you may apply the electric heaters 90A and 90B of 4th Embodiment to 1st Embodiment thru | or 3rd Embodiment.

  The present invention is not limited to the above-described embodiment, and the configuration can be changed as appropriate without departing from the spirit of the present invention. For example, in the hot water supply system 100C of the third embodiment, the hot water heater 1C and the distribution unit 50C may be configured integrally as in the second embodiment. In the hot water supply system 100D of the fourth embodiment, The machine 1D and the distribution unit 50A may be configured integrally as in the second embodiment.

  In each embodiment, only a single main hot water supply terminal 60 is illustrated as the first hot water supply terminal. However, a plurality of first hot water supply terminals are provided by appropriately branching the downstream side of the distribution units 50A, 50B, and 50C. You may make it connect. The same applies to the second hot water supply terminal.

100A, 100B, 100C, 100D Hot water supply system 1A, 1B, 1C, 1D Hot water heater 2 Hot water storage unit 3 Heat pump unit (heating means)
4. Control device (control means)
11 Hot water storage tank (tank)
17 Hot water supply heat exchanger 20 General hot water supply path 30 Bath hot water supply path 50A, 50B, 50C Distribution unit 51b Main hot water supply branch pipe (first flow path)
51c Sub hot water supply branch pipe (second flow path)
53 Main hot water mixing valve (1st hot water mixing valve)
54 Sub hot water mixing valve (second hot water mixing valve)
55 Main hot water supply pipe (first flow path)
56 Sub hot water supply pipe (second flow path)
57 Control device (control means)
60 Main hot water supply terminal (first hot water supply terminal)
70 Sub hot water terminal (second hot water terminal)
80 Bathtub (tub terminal)
90A, 90B Electric heater FS1 Hot water supply flow rate sensor FS3 Main hot water supply flow rate sensor FS4 Sub hot water supply flow rate sensor P1 Hot water supply circulation pump R1 Main remote control R2 Sub remote control R3 Sub remote control T6 Main hot water supply temperature sensor (first temperature detection means)
T7 Sub-hot-water temperature sensor (second temperature detection means)
RV1, RV2 Pressure reducing valve V6 Hot water supply mixing valve

Claims (4)

Tank for storing heat medium, heating means for heating the heat medium in the tank, hot water supply heat exchanger for exchanging heat between the high temperature heat medium taken out from the tank and low temperature water at a lower temperature, and hot water heat exchange A hot water supply circulation pump that circulates the high-temperature heat medium between a tank and the tank, a general hot water supply path for supplying hot water to a general hot water supply terminal, and a bathtub hot water supply path for supplying hot water to a bathtub terminal;
A first flow path through which hot water at a first hot water supply temperature set in at least a first hot water supply terminal flows and a second flow through which hot water at a second hot water temperature set in a second hot water supply terminal flows through the general hot water supply path. A distribution unit that branches into a road and distributes the hot water,
The dispensing unit is at least
A first hot water mixing valve for mixing the hot water flowing through the first flow path and the low-temperature water;
A second hot water mixing valve for mixing the hot water flowing through the second flow path and the low temperature water;
First temperature detecting means for detecting a first temperature of hot water flowing through the first flow path;
Second temperature detection means for detecting a second temperature of hot water flowing through the second flow path;
The hot water supply circulation pump or the first hot water supply mixing valve is controlled so as to be the first hot water supply temperature based on the first temperature, and the hot water supply circulation is set so as to be the second hot water supply temperature based on the second temperature. Control means for controlling the pump or the second hot water supply mixing valve;
A hot water supply system characterized by including. Introduced into the tank for storing the heat medium, heating means for heating the heat medium in the tank, the hot water mixing valve for mixing the high temperature heat medium taken out from the tank and the low temperature water at a lower temperature, and the hot water mixing valve A water heater including a pressure reducing valve for reducing the low temperature water to a predetermined pressure, a general hot water supply path for supplying hot water to a general hot water supply terminal, and a bathtub hot water supply path for supplying hot water to a bathtub terminal;
A first flow path through which hot water at a first hot water supply temperature set in at least a first hot water supply terminal flows and a second flow through which hot water at a second hot water temperature set in a second hot water supply terminal flows through the general hot water supply path. A distribution unit that branches into a road and distributes the hot water,
The dispensing unit is at least
A first hot water supply mixing valve for mixing hot water flowing through the first flow path and the low-temperature water reduced to the predetermined pressure;
A second hot water supply mixing valve for mixing hot water flowing through the second flow path and the low temperature water reduced to the predetermined pressure;
First temperature detecting means for detecting a first temperature of hot water flowing through the first flow path;
Second temperature detection means for detecting a second temperature of hot water flowing through the second flow path;
The hot water supply circulation pump or the first hot water supply mixing valve is controlled so as to be the first hot water supply temperature based on the first temperature, and the hot water supply circulation is set so as to be the second hot water supply temperature based on the second temperature. Control means for controlling the pump or the second hot water supply mixing valve;
A hot water supply system characterized by including.   The hot water supply system according to claim 1 or 2, wherein the distribution unit is configured integrally with the hot water heater.   The hot water supply system according to any one of claims 1 to 3, wherein the heating means is an electric heater provided inside the tank.

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