JP2011163608A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater for efficiently using hot water by effectively using medium temperature water, achieving the improvement of usability and high power saving. <P>SOLUTION: The water heater is provided with a first tapping pipe 3 connected to an upper part of a hot water storage tank 1, a water supply pipe 18 connected to a lower part, a second tapping pipe 4 connected between the first tapping pipe 3 and the water supply pipe 18 in the vertical direction of hot water storage tank 1, and a hot-water supply opening 24 connected to an outlet side of a mixing valve 22. On the basis of detected temperatures of a first hot water temperature detection means 30 for detecting the temperature of hot water in the hot water storage tank 1 near the first tapping pipe 3 and a second hot water temperature detection means 31 for detecting the temperature of hot water in the hot water storage tank 1 near the second tapping pipe 4 and a hot-water supply set temperature supplied from the hot-water supply opening 24, action of a flow-controlling valve 20 provided at the second tapping pipe 4 and the mixing valve 22 to an entrance side of which a tapping pipe junction pipe 21, where the first tapping pipe 3 and the second tapping pipe 4 are connected and joined, and a water supply branch pipe 19 diverged from the water supply pipe 18 are connected are controlled. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus that stores hot water in a hot water storage tank and uses the hot water.

  Conventionally, this kind of hot water supply apparatus has a thing like FIG. 7, for example (for example, refer patent document 1).

  FIG. 7 shows a conventional hot water supply apparatus described in Patent Document 1. As shown in FIG. As shown in FIG. 7, a hot water tank 1, a heating means 2 for heating the hot water in the hot water tank 1, a first outlet pipe 3 connected to the upper part of the hot water tank 1, and an intermediate portion of the hot water tank 1 A second outlet pipe 4 connected, a three-way valve 5 for switching whether the hot water from the hot water storage tank 1 is discharged through the first outlet pipe 3 or the second outlet pipe 4, and a second outlet pipe 4 is provided with hot water temperature detecting means 6 for detecting the hot water temperature in the hot water tank 1 at the position to which 4 is connected, and hot water temperature setting means 7 for setting the hot water temperature, and the hot water temperature detected by the hot water temperature detecting means 6 The flow of the three-way valve 5 is such that if it is equal to or higher than the hot water supply temperature set by the hot water supply temperature setting means 7, the hot water is discharged from the second hot water discharge pipe 4, and if it is lower than the hot water supply set temperature, the hot water is discharged from the first hot water discharge pipe 3. Switch the path.

JP 2003-161518 A

  However, in the conventional configuration in which the hot water from the upper part of the hot water tank 1 and the hot water from the intermediate part are switched, the remaining hot water in the hot water tank 1 and the hot water from the lower part of the hot water tank 1 are supplied by heat conduction and convection in the process of using hot water. Only the hot water of the part that is higher than the hot water supply set temperature in the layer (hereinafter referred to as the intermediate temperature layer) that is at an intermediate temperature between the replenishing water supply and the hot water of the intermediate temperature layer that is lower than the hot water supply set temperature can be used. Moves to the upper part of the hot water tank 1 as it is.

  Here, this operation will be described in detail with reference to FIGS. First, FIG. 8 explains the intermediate temperature layer, and shows the temperature distribution with the horizontal axis representing temperature and the vertical axis representing hot water tank 1 height. The hot water tank 1 in use is in a state in which high temperature hot water 8 and low temperature water 9 are stacked, but the intermediate temperature between the high temperature hot water 8 and the low temperature water 9 due to heat conduction and heat convection. The intermediate temperature layer 10 that grows grows with time.

  As a difference in the amount of hot water that can be used depending on the size of the intermediate temperature layer 10, the temperature distribution of 11 is a state in which the intermediate temperature layer 10a is small, and 12 is a state in which the intermediate temperature layer 10b is large. In this case, the difference in the amount of heat that can be used corresponds to the region 13. That is, as the middle temperature layer 10 becomes larger, hot water runs out more easily, and that the amount of heat that can be used in the hot water stored in the hot water storage tank 1 is small, that is, energy saving is low.

  Therefore, the hot water in the hot water storage tank 1 is discharged from the second hot water discharge pipe 4 to reduce the intermediate temperature layer 10, and this operation will be described with reference to FIG. A hot water discharge position from the second hot water discharge pipe 4 is schematically indicated by an arrow 14, and a temperature distribution 15 is a time point when the upper end of the intermediate temperature layer 10 reaches the position of the second hot water discharge pipe 4. The size of the intermediate temperature layer 10 is indicated by 10c.

Thereafter, the hot water of the intermediate temperature layer 10 is discharged through the second hot water discharge pipe 4, so that the temperature distribution is 1
6 and the size of the intermediate temperature layer 10 is reduced to 10d. When the hot water temperature in the hot water storage tank 1 falls below the lower limit temperature ts of hot water that can be used for hot water supply at the position of the second hot water discharge pipe 4, the three-way valve 5 is switched to discharge hot water from the first hot water discharge pipe 3. As it goes to the upper part of the hot water tank 1 as it is, the temperature distribution becomes 17 and does not decrease and increases with time as shown in 10e.

  Thus, in the case of the conventional configuration, since the effect of reducing the intermediate temperature layer 10 is limited, the amount of hot water in the hot water tank 1 cannot be effectively used, and at the next boiling, the intermediate temperature layer This means that water having a relatively high temperature as shown in Fig. 10 has to be heated, and when a heat pump is used as the heating means 2, the water efficiency is high due to the characteristic that the operation efficiency is lowered. There is a problem of disturbing proper driving.

  That is, in the configuration in which the hot water position is switched, there are problems of a reduction in the amount of hot water that can be used due to the fact that hot water in the mixed layer cannot be discharged, and a reduction in efficiency when boiling with a heat pump.

  The present invention solves the above-mentioned conventional problems, and can effectively use hot water in the middle temperature layer, and can obtain high heating efficiency when the heating means is a heat pump. Then, it aims at providing the hot water supply apparatus which implement | achieves an improvement of usability and high energy saving property.

  In order to solve the conventional problem, a hot water supply apparatus of the present invention includes a hot water storage tank, a first hot water pipe connected to the upper part of the hot water tank, a water supply pipe connected to the lower part of the hot water tank, A second hot water discharge pipe connected between a position where the first hot water discharge pipe is connected and a position where the water supply pipe is connected in the vertical direction of the hot water storage tank, and a water supply branch branched from the water supply pipe A pipe, a flow control valve provided in the second tapping pipe, a tapping pipe joining pipe formed by connecting the first tapping pipe and the second tapping pipe, and the tapping pipe joining pipe And a water supply branch connected to the outlet side of the mixing valve, a hot water supply port connected to the mixed water pipe, and the first outlet pipe are connected. The first hot water temperature detecting means for detecting the hot water temperature in the vicinity of the hot water storage tank and the second hot water discharge pipe are connected. A second hot water temperature detecting means for detecting a hot water temperature in the vicinity of the hot water storage tank; a hot water supply temperature setting means for setting a hot water supply temperature to be supplied from the hot water outlet; and a control means; and the hot water temperature setting means. The operation of the flow control valve and the mixing valve is controlled based on the hot water set temperature set in step 1 and the detected temperatures of the first and second hot water temperature detecting means.

  Thereby, the hot water of the middle temperature layer lower than the hot water supply set temperature can be effectively used through the second hot water discharge pipe.

  According to the present invention, hot water can be used efficiently by effectively using hot water in the middle temperature layer. Further, when the heating means is a heat pump, high heating efficiency can be obtained, which improves usability. A hot water supply device that achieves energy saving can be provided.

Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Control block diagram of the water heater Flow chart of flow control Figure showing the temperature distribution in the hot water tank when using the hot water The block diagram of the hot-water supply apparatus in Embodiment 2 of this invention Flow chart of flow control Configuration diagram of conventional hot water supply equipment Explanatory drawing of the middle temperature layer in the hot water tank The figure which showed temperature distribution in the hot water storage tank of the hot water supply device

  1st invention WHEREIN: The hot water storage tank, the 1st hot water pipe connected to the upper part of the said hot water storage tank, the water supply pipe connected to the lower part of the said hot water storage tank, and the said 1st in the up-down direction of the said hot water storage tank A second hot water pipe connected between a position where the hot water pipe is connected and a position where the water pipe is connected, a water branch pipe branched from the water pipe, and a second hot water pipe The flow control valve, the first hot water pipe and the second hot water pipe connected to join together, the hot water pipe joint pipe, the hot water pipe joint pipe and the feed water branch pipe connected to the inlet side The mixing valve, the mixing water pipe connected to the outlet side of the mixing valve, the hot water supply port connected to the mixing water pipe, and the hot water temperature in the vicinity of the hot water storage tank connected to the first hot water discharge pipe. First hot water temperature detecting means for detecting and hot water temperature in the vicinity of the hot water storage tank connected to the second hot water discharge pipe are detected. Hot water temperature detection means, hot water supply temperature setting means for setting hot water supply set temperature to be supplied from the hot water outlet, and control means, and the hot water supply set temperature set by the hot water supply temperature setting means and the first and second On the basis of the detected temperature of the hot water temperature detecting means, the operation of the flow control valve and the mixing valve is controlled.

  As a result, by effectively discharging the hot water in the middle temperature layer from the middle part of the hot water tank, the amount of heat of the stored hot water can be effectively used to the maximum and the decrease in boiling efficiency can be prevented. There is an effect that usability and high energy saving can be realized.

  In the second invention, the value obtained based on the temperature detected by the first and second hot water temperature detecting means is higher than the hot water supply set temperature set by the hot water supply temperature setting means, and the temperature difference is a predetermined temperature. In the above case, the flow control valve provided in the second outlet pipe is opened, and when the temperature difference is less than a predetermined temperature difference, the flow control valve is closed, and the outlet temperature of the mixing valve is set to the hot water supply temperature. Control is performed so as to approach the set temperature, and there is an effect that hot water in the middle temperature layer can be effectively used while maintaining controllability of the hot water supply temperature.

  According to a third aspect of the present invention, at least one additional hot-water supply port is provided in addition to the hot-water supply port, and the hot-water supply temperature setting means can set an additional hot-water supply set temperature for each additional hot-water supply port. Connecting the outlet hot water pipe joining pipe branch pipe branched from the joining pipe, the second feed water branch pipe branched from the feed water branch pipe, the outlet hot water joining pipe branch pipe and the second feed water branch pipe to the inlet side And an additional mixed water pipe connected to an outlet side of the additional mixing valve, the hot water supply set temperature set by the hot water supply temperature setting means, the additional hot water set temperature, and the first and second hot water. The operation of the flow control valve, the mixing valve, and the additional mixing valve is controlled based on the detected temperature of the temperature detecting means, and the operation of the flow control valve, the mixing valve, and the additional mixing valve Multiple hot water outlets There is an effect that can be effectively utilized the hot water of the medium-temperature layer even in the case that.

  In the fourth invention, the value obtained based on the temperature detected by the first and second hot water temperature detecting means is the highest among the hot water supply set temperature and the additional hot water set temperature set by the hot water supply temperature setting means. When the temperature difference is higher than the value and the temperature difference is equal to or higher than the predetermined temperature, the flow regulating valve provided in the second tapping pipe is opened, and when the temperature difference is less than the predetermined temperature difference, the flow regulating valve is closed. The outlet temperature of the mixing valve and the additional mixing valve is controlled so as to approach the hot water supply set temperature and the additional hot water set temperature, respectively, and ensures controllability when a plurality of hot water outlets are provided. However, there is an effect that the hot water in the middle temperature layer can be used effectively.

According to a fifth aspect of the present invention, a hot water supply presence / absence detecting means for detecting the presence or absence of hot water supply is provided in the mixed water pipe and the additional mixed water pipe, and the hot water supply port and / or the additional hot water supply port detected by the hot water supply presence / absence detection means. On the other hand, the value obtained based on the temperature detected by the first and second hot water temperature detection means is higher than the highest value among the hot water supply set temperature and the additional hot water supply set temperature set by the hot water supply temperature setting means. If the temperature difference is equal to or higher than the predetermined temperature, the flow regulating valve provided in the second tapping pipe is opened, and if the temperature difference is less than the predetermined temperature difference, the flow regulating valve is closed. The outlet temperature of the mixing valve and the additional mixing valve is controlled so as to approach the hot water supply set temperature and the additional hot water supply set temperature, respectively. Medium control with fine control There is an effect of improving the utilization effect of the hot water of the layers.

  In addition, even when hot water is supplied from a plurality of hot water outlets simultaneously, there is an effect that hot water in the middle temperature layer can be used effectively while maintaining controllability of the hot water temperature.

  In the sixth aspect of the invention, the flow control valve is a two-way valve, and a desired effect can be obtained with a simple configuration and control.

  7th invention is provided with the heating means which heats the water in a hot water tank, The said heating means was made into the heat pump cycle, and it is low by being able to utilize the calorie | heat amount of the hot water in a hot water tank effectively. As a result of applying the boiling temperature, high efficiency characteristics can be maximized.

  The eighth invention is characterized in that the heat pump cycle is configured to heat water with a refrigerant whose high side pressure is increased to a critical pressure or higher during operation, and the boiling temperature can be increased. The increase in the amount of heat that can be used and the ability to prevent running out of hot water can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a hot water supply apparatus according to the first embodiment of the present invention.

  In FIG. 1, a hot water tank 1, a heat pump unit 2 as a heating means for heating the water in the hot water tank 1, a first outlet pipe 3 connected to the upper part of the hot water tank 1, and a lower part of the hot water tank 1. Branches from the connected water supply pipe 18, between the position where the first hot water supply pipe 3 and the water supply pipe 18 are connected, that is, to the second hot water supply pipe 4 connected to the body of the hot water tank 1, and from the water supply pipe 18. Of the water supply branch pipe 19, the two-way valve 20 provided in the middle of the second hot water pipe 4, and the hot water pipe joining the first hot water pipe 3 and the second hot water pipe 4. A pipe 21, a mixing valve 22 connected to the outlet pipe joining pipe 21 and the feed water branch pipe 19 on the inlet side, a mixing water pipe 23 connected to the outlet side of the mixing valve 22, and the mixing water pipe 23 Hot water supply port 24, hot water pipe merging pipe branch pipe 25 branched from hot water pipe merging pipe 21, and water supply branch pipe 9, an additional mixing valve 27 in which a second feed water branch pipe 26 branched from the outlet 9, a tapping pipe joining pipe branch pipe 25 and a second feed water branch pipe 26 are connected to the inlet side, and an outlet side of the additional mixing valve 27 An additional mixed water pipe 28 connected to the additional mixed water pipe 28 and an additional hot water supply port 29 connected to the additional mixed water pipe 28 are provided.

  Moreover, the 1st hot water temperature detection means 30 which detects the hot water temperature in the hot water storage tank 1 in the position where the 1st hot water discharge pipe 3 was connected, and the hot water storage tank 1 in the position where the 2nd hot water discharge pipe 4 was connected. The second hot water temperature detecting means 31 for detecting the hot water temperature of the hot water, the hot water supply temperature setting means 7 for setting the hot water supply temperature of the hot water supply port 24 and the additional hot water supply port 29, the first hot water temperature detecting means 30 and the second hot water. A control device 33 having a control means 32 for controlling the operation of the two-way valve 20, the mixing valve 22 and the additional mixing valve 27 based on the output of the temperature detecting means 31 and the setting of the hot water supply temperature setting means 7 is provided. Yes.

  A mixing valve outlet hot water temperature detecting means 34 and an additional mixing valve outlet hot water temperature detecting means 35 for controlling the hot water temperature are provided on the outlet side of the mixing valve 22 and the additional mixing valve 27.

  FIG. 2 shows a block diagram of the control. Based on the outputs of the first hot water temperature detecting means 30 and the second hot water temperature detecting means 31 and the setting of the hot water temperature setting means 7, the two-way valve 20, the mixing valve 22, It comprises control means 32 for controlling the additional mixing valve 27.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As a basic operation, the hot water tank 1 is filled with a lot of low-temperature water before boiling, and when the operation is started, the water in the hot water tank 1 is sent to the heat pump unit 2 where it is heated and heated to hot water. Is returned to the hot water tank 1. As a result, hot water is stored in the hot water tank 1.

  When using hot water after boiling, the mixing valve 22 and the additional mixing valve 27 supply hot water from the hot water tank 1 discharged through the first and second tapping pipes 3 and 4 and the water supplied from the water supply pipe 18. It is mixed with each hot water supply set temperature and supplied to hot water supply port 24 or additional hot water supply port 29. Further, water corresponding to the amount of hot water used for hot water supply flows from the lower part of the hot water tank 1 through the water supply pipe 18.

  Here, the operation when using the hot water supply will be described in detail with reference to FIGS. The hot water supply temperature is set for each hot water supply port 24 and additional hot water supply port 29 by the hot water supply temperature setting means 7 as a hot water supply set temperature and an additional hot water supply set temperature, respectively, and the higher value thereof is the set temperature ts. Here, ts is the hot water supply set temperature of the hot water supply port 24. Moreover, the pressure loss of each flow path is designed so that the flow rate of the hot water flowing through the first hot water discharge pipe 3 and the second hot water discharge pipe 4 when the two-way valve 20 is opened becomes equal. This flow rate ratio can be designed arbitrarily.

  FIG. 3 is a flowchart of control. t1 and t2 are measured values by the first hot water temperature detecting means 30 and the second hot water temperature detecting means 31, respectively, and the control means 32 determines whether or not these average values are higher than the set temperature ts. (Step 1) If it is high, the two-way valve 20 is opened (Step 2), and the hot water is discharged from both the first hot water discharge pipe 3 and the second hot water discharge pipe 4. The temperature of the hot water flowing through the tapping pipe joining pipe 21 becomes an average value of t1 and t2, and the control means 32 controls the mixing valve 22 to mix this hot water and the feed water from the feed water branch pipe 19 to mix the hot water at the mixing valve outlet. The flow rate ratio is adjusted so that the temperature detection means 34 becomes the set temperature ts (step 3).

  When the average value of t1 and t2 is equal to or lower than the set temperature ts in step 1, the two-way valve 20 is shut off by the control means 32 (step 4), and the mixing valve 22 supplies hot water and water from the first outlet pipe 3. The feed water from the branch pipe 19 is mixed (step 3). Hot water adjusted to the set temperature ts is supplied from the hot water supply port 24 through the mixed water pipe 23. In this description, the temperature difference between the set temperature ts and the average value of the measured values by the first hot water temperature detecting means 30 and the second hot water temperature detecting means 31 is controlled with 0 ° C. as a threshold value. In consideration of the controllability of the mixing valve 22 and the temperature drop in the piping, an arbitrary value may be added to ts in the expression of Step 1.

  FIG. 4 is a diagram showing changes in the temperature distribution in the hot water tank 1. The horizontal axis indicates the temperature, and the vertical axis indicates the height of the hot water tank 1, and the temperature distribution 36 indicates that the upper end of the intermediate temperature layer 10 is at the connection position with the hot water tank 1 of the second outlet pipe 4, that is, the intermediate temperature. It is a state just before the hot water supply use of the layer 10 is started. As described above, while the average hot water temperature between the upper end of the hot water storage tank 1 which is the connection position of the first hot water discharge pipe 3 and the connection position of the second hot water discharge pipe 4 is higher than ts, hot water is discharged from both, 10 moves down the hot water tank 1 while being reduced.

  At this time, hot water is discharged from the second hot water discharge pipe 4 to the hot water temperature obtained by subtracting the temperature difference between the temperature at the upper end of the hot water storage tank 1 and ts from ts. When the average hot water temperature becomes equal to or lower than ts, the hot water from the second hot water pipe 4 is stopped and the hot water tank 1 is moved as it is. As a result, the size of the intermediate temperature layer 10 is initially 10 f but is reduced to 10 g. 37 is a temperature distribution at the time when the intermediate temperature layer 10g passes the connection position of the second hot water discharge pipe 4.

  In the case of this embodiment, the control of the two-way valve 20 is performed based on ts even when the hot water is supplied from the additional hot water supply port 29 having a lower set temperature.

  As described above, according to the first embodiment of the present invention, the higher one of the hot water supply set temperature of the hot water supply port 24 set by the hot water supply temperature setting means 7 and the additional hot water supply set temperature of the additional hot water supply port 29. The medium temperature layer 10 is simply configured to open and close the two-way valve 20 provided in the second hot water discharge pipe 4 based on the measured value and the measured value of the first hot water temperature detecting means 30 and the second hot water temperature detecting means 31. Therefore, it is possible to reduce the amount of available hot water and to prevent the boiling efficiency of the heat pump unit 2 from being lowered. Therefore, it is possible to realize good usability and high energy saving.

  Furthermore, the refrigeration cycle of the heat pump unit 2 preferably uses carbon dioxide as a refrigerant and is operated at a pressure exceeding the critical pressure. Since the boiling temperature can be increased by using carbon dioxide as a refrigerant, the hot water temperature in the hot water tank 1 can be freely controlled.

(Embodiment 2)
FIG. 5 is a diagram showing a configuration of a hot water supply apparatus according to the second embodiment of the present invention. In addition to the configuration of the first embodiment, the mixed water pipe 23 and the additional mixed water pipe 28 are respectively provided with a first flow meter 38 and a second flow meter 39 as hot water supply presence / absence detection means. Thereby, since the valve is controlled based on the set temperature at which hot water is actually supplied, the effect of reducing the intermediate temperature layer 10 is higher.

  FIG. 6 is a flowchart of the operation. A method for determining the set temperature ts based on the outputs of the first flow meter 38 and the second flow meter 39 is shown. First, the hot water supply set temperature ts1 at the hot water supply port 24 and the additional hot water supply set temperature ts2 at the additional hot water supply port 29 are compared (step 11), and the higher value is set as the set temperature ts (step 12, step 13).

  Next, when the first flow meter 38 detects hot water supply from the hot water supply port 24 (step 14) and the second flow meter 39 also detects hot water supply from the additional hot water supply port 29 (step 15), hot water supply setting is performed. The temperature ts1 and the additional hot water supply set temperature ts2 are compared (step 16), and the higher value is set as the set temperature ts (step 17 and step 18). If there is no hot water supply from the additional hot water supply port 29 (step 15), the hot water supply set temperature ts1 is set as the set temperature ts (step 19). If hot water supply from the hot water supply port 24 is not detected in step 14 and hot water supply is detected in the additional hot water supply port 29 (step 20), the additional hot water supply set temperature ts2 is set as the set temperature ts (step 21).

  When no hot water supply is detected at the hot water supply port 24 or the additional hot water supply port 29 (steps 14 and 20), the values employed in step 12 or step 13 are used as they are. Based on the set temperature ts thus determined, the same operation as the valve control (FIG. 3) described in the first embodiment is performed (step 22).

  As described above, according to the second embodiment of the present invention, the valve is finely controlled according to the hot water supply state, the effect of reducing the intermediate temperature layer 10 is further increased, and the usability and energy saving are further increased. Excellent in properties.

  As described above, the hot water supply apparatus according to the present invention minimizes the decrease in the amount of hot water that can be supplied when using the heat of hot water in the hot water storage tank, so that it can be applied to the above-mentioned domestic hot water supply apparatuses. It can also be applied to large-scale applications such as business use in a system having a heat source and a hot water tank, and can provide excellent energy saving.

1 Hot water tank 2 Heating means (heat pump unit)
3 First hot water pipe 4 Second hot water pipe 7 Hot water supply temperature setting means 18 Water supply pipe 19 Water supply branch pipe 20 Two-way valve (flow control valve)
21 Hot water outlet pipe confluence pipe 22 Mixing valve 23 Mixed water pipe 24 Hot water outlet 25 Hot water outlet confluence pipe branch pipe 26 Second water supply branch pipe 27 Additional mixing valve 28 Additional mixed water pipe 29 Additional hot water outlet 30 First hot water temperature detecting means 31 2 hot water temperature detection means 32 control means 38 hot water supply presence / absence detection means (first flow meter)
39 Hot water supply presence / absence detection means (second flow meter)

Claims (8)

A hot water storage tank, a first hot water pipe connected to the upper part of the hot water tank, a water supply pipe connected to the lower part of the hot water tank, and the first hot water pipe connected in the vertical direction of the hot water tank A second hot water discharge pipe connected between a position and a position where the water supply pipe is connected; a water supply branch pipe branched from the water supply pipe; and a flow control valve provided in the second hot water discharge pipe; , A tapping pipe joining pipe joined by joining the first tapping pipe and the second tapping pipe, a mixing valve connected to the inlet side of the tapping pipe joining pipe and the feed water branch pipe, A first detecting the hot water temperature near the position of the hot water storage tank connected to the mixed water pipe connected to the outlet side of the mixing valve, the hot water supply port connected to the mixed water pipe, and the first hot water outlet pipe. Second hot water temperature detecting means for detecting a hot water temperature in the vicinity of the hot water storage tank to which the hot water temperature detecting means and the second hot water discharge pipe are connected. A hot water supply temperature setting means for setting a hot water supply temperature to be supplied from the hot water supply port, and a control means, and the hot water supply set temperature set by the hot water supply temperature setting means and the first and second hot water temperature detections A hot water supply apparatus that controls operations of the flow control valve and the mixing valve based on a detected temperature of the means. When the value obtained based on the temperature detected by the first and second hot water temperature detecting means is higher than the hot water supply set temperature set by the hot water supply temperature setting means and the temperature difference is equal to or higher than the predetermined temperature, the first value is obtained. 2 is opened, and when the temperature difference is less than a predetermined temperature difference, the flow control valve is closed so that the outlet temperature of the mixing valve approaches the hot water supply set temperature. The hot water supply device according to claim 1, wherein the hot water supply device is controlled. In addition to the hot water supply port, at least one additional hot water supply port is provided, and the hot water supply temperature setting means can set an additional hot water supply set temperature for each of the additional hot water supply ports, and is branched from the outlet pipe joining pipe for each of the additional hot water supply ports. A hot water pipe joining pipe branch pipe, a second feed water branch pipe branched from the feed water branch pipe, an additional mixing valve connecting the hot water pipe join pipe branch pipe and the second feed water branch pipe to the inlet side, An additional mixed water pipe connected to the outlet side of the additional mixing valve, and the hot water set temperature set by the hot water temperature setting means, the additional hot water set temperature, and the detected temperature of the first and second hot water temperature detecting means The hot water supply device according to claim 1, wherein operations of the flow control valve, the mixing valve, and the additional mixing valve are controlled based on The value obtained based on the temperature detected by the first and second hot water temperature detecting means is higher than the highest value among the hot water supply set temperature set by the hot water supply temperature setting means and the additional hot water supply set temperature. When the difference is equal to or higher than the predetermined temperature, the flow control valve provided in the second tapping pipe is opened, and when the temperature difference is less than the predetermined temperature difference, the flow control valve is closed and added to the mixing valve. The hot water supply apparatus according to claim 3, wherein the outlet temperature of the mixing valve is controlled so as to approach the hot water supply set temperature and the additional hot water supply set temperature, respectively. Hot water supply presence / absence detection means for detecting presence / absence of hot water supply is provided in the mixed water pipe and the additional mixed water pipe, and a first hot water supply port and / or an additional hot water supply port detected by the hot water supply presence / absence detection means are provided for the first time. The value obtained based on the temperature detected by the second hot water temperature detecting means is higher than the highest value among the hot water supply set temperature set by the hot water supply temperature setting means and the additional hot water set temperature, and the temperature difference is When the temperature is higher than the predetermined temperature, the flow control valve provided in the second tapping pipe is opened, and when the temperature difference is less than the predetermined temperature difference, the flow control valve is closed, and the mixing valve and the additional mixing valve The hot water supply apparatus according to claim 4, wherein the outlet temperature is controlled so as to approach the hot water supply set temperature and the additional hot water set temperature, respectively. The hot water supply apparatus according to any one of claims 1 to 5, wherein the flow control valve is a two-way valve. The hot water supply apparatus according to any one of claims 1 to 6, wherein heating means for heating water in the hot water tank is provided, and the heating means is a heat pump cycle. The hot water supply apparatus according to claim 7, wherein the heat pump cycle is configured to heat water with a refrigerant whose high side pressure is increased to a critical pressure or more during operation.

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