JP2008224209A - Storage type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide economical equipment matching to Japanese housing conditions, efficiently utilizing hot water in a plurality of hot water storage tanks connected in series to one another for reheating a bath. <P>SOLUTION: This storage type hot water supply device comprises a hot water heat exchanger 25 using hot water in a tapping side hot water storage tank 6 located on the most downstream side of the plurality of hot water storage tanks storing hot water heated by a heating means 8 and connected in series to one another, for heating bathtub water, a bath circulation pump 23 for circulating bathtub water in the hot water heat exchanger 25, and a water supply side hot water storage tank 2 located on the most upstream side of the plurality of hot water storage tanks and connected to a water supply pipe 3, wherein the hot water heat-exchanged with the hot water heat exchanger 25 is guided into the water supply side hot water storage tank 2 so that high-temperature hot water can be reliably supplied into the tapping side hot water storage tank 6. Thus, the storage type hot water supply device has improved user-friendliness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus mainly equipped with a heating function for bath water.

  This type of conventional hot water storage type hot water supply apparatus is a hot water storage tank that is supplied with water from the bottom and discharged from the top, a heater provided in the upper part of the hot water storage tank, and water taken from the hot water storage tank above the heater. A circulation pump that circulates to the lower part of the basin, and a circulation circuit of the circulation pump that has a bath heat exchanger that exchanges heat between the water taken out of the hot water tank and the water in the bathtub. In addition, there is one that realizes a bath chasing function using one heater (for example, see Patent Document 1).

  In addition, the hot water heater body is thinned and heated in a series of pipes connected in series with heating elements at the bottom so that it can be installed in a space that cannot be installed with a single hot water tank. Temperature detection means for detecting hot water temperature and feed water temperature, hot water temperature setting means for setting boiling water temperature, power supply detection means for detecting presence or absence of power supply for midnight power, temperature detection means, hot water temperature setting means and power supply Calculation means for calculating an energization start time for moving the energization to the latter half of the midnight power time zone based on the output of the detection means, and heating element control means for controlling energization to the heating element based on the output of the calculation means (For example, refer to Patent Document 2).

  However, there is no one that realizes a bath reheating function by combining an electric water heater composed of a plurality of hot water storage tanks and a bath heat exchanger.

  Therefore, when an electric water heater with a bath reheating function is configured by combining the above-described conventional techniques, it is as shown in FIG.

Hereinafter, the configuration will be described with reference to the drawings. In FIG. 5, reference numeral 41 denotes an electric water heater product, and 42 is a cylindrical water supply side hot water storage tank. Water is supplied from a water supply pipe 43 and water is heated by a water supply side heater 44. A cylindrical hot water storage tank 45 connected in series with a water supply hot water storage tank 42 and a connecting pipe 46 heats water with a hot water heater 47 and discharges from a hot water pipe 48. Reference numeral 49 denotes a bathtub, and the electric water heater 41 and the bathtub circulation port 50 are connected to each other by an outgoing pipe 51 and a return pipe 52 to fill the bathtub 49 and reheat it. Inside the electric water heater 41, the return pipe 52 is connected via the bath circulation pump 53 through the heat exchange pipe 55 built in the hot water heat exchanger 54 and returned to the forward pipe 51 to form a bath circulation circuit. is doing. The hot water heat exchanger 54 is connected by a hot water storage tank 45, a forward pipe 57, and a return pipe 58, and the hot water of the hot water storage tank 45 is guided by a reheating heating pump 59, and bath water is contained therein. By exchanging heat with the heat exchange pipe 55 that circulates, the bath water is reheated.
JP 05-106915 A JP 2001-108292 A

  In recent years, in the case of hot-water storage water heaters such as electric water heaters and heat pump water heaters, there has been an increasing demand not only for hot water supply functions for baths but also for reheating bath water. In addition, the hot water storage capacity has become larger and the outer dimensions of the products tend to be larger, but considering the housing situation in Japan, a thin main body with a small depth of the equipment body that can be installed in a narrow passage around the house is desired. Yes.

  However, connecting a plurality of hot water storage tanks having a small body diameter in series enables the device body to be thinned, but the amount of hot water stored per hot water storage tank is reduced. Therefore, if the bath water is reheated using the hot water of the tapping water tank, and the low temperature water after the bath water heating is returned to the tapping water tapping tank again, the bath water is reheated several times. However, the hot water storage tank is filled with low-temperature water, and the hot water in the hot water storage tank is hot, but the bath water cannot be reheated.

  The expectation of users who use electric water heaters and heat pump water heaters is to use hot water heated by cheap late-night power as efficiently as possible and try to produce benefits at running cost. Reheating the low-temperature water in the tapping hot water storage tank using electric power has the problem that the contribution rate of hot water heated using midnight electric power becomes zero and does not necessarily meet the user's expectations. It was.

  In order to solve the above-mentioned problems, the present invention provides a tank unit configured by connecting a plurality of hot water storage tanks that store hot water heated by heating means in series, and a tapping hot water storage tank located on the most downstream side of the tank unit. A hot water heat exchanger that reheats the bath water using hot water, a bath circulation path through which the bath water circulates via the hot water heat exchanger, and a bath circulation that circulates the bath water through the bath circulation path A pump and a water supply-side hot water storage tank that is located on the most upstream side of the tank unit and connected to a water supply pipe, and guides the hot water in the hot water storage-side hot water tank after heat exchange by the hot water heat exchanger to the water supply-side hot water storage tank In addition to the configuration, a heat exchange pipe for forming the bath circulation path is provided in the hot water heat exchanger.

  According to the above invention, hot water in a plurality of hot water storage tanks can be efficiently used without waste, an installation form suitable for Japanese housing circumstances can be provided, and equipment that meets user expectations can be provided. .

  According to the hot water storage type hot water supply apparatus of the present invention, even if the hot water storage capacity is increased, a plurality of hot water storage tanks are connected in series, so that the hot water storage capacity can be increased without increasing the depth of the device body. It can correspond to. Furthermore, since the hot water in the tapping water storage tank after the heat exchange with the hot water heat exchanger is guided to the hot water storage tank, the downstream tapping water storage tank has hot water used for reheating the bathtub water. The amount of hot water equal to the amount used for hot water supply or hot water supply is supplied from the upstream hot water storage tank, hot water can be reliably supplied to the hot water storage tank, and hot water can be used efficiently without waste. We can provide economical equipment that matches the housing situation in Japan.

  The hot water storage type hot water supply apparatus according to claim 1 is a tank unit configured by connecting a plurality of hot water storage tanks for storing hot water heated by heating means in series, and a tapping hot water storage tank located on the most downstream side of the tank unit. A hot water heat exchanger that reheats the bath water using hot water, a bath circulation path through which the bath water circulates via the hot water heat exchanger, and a bath that circulates the bath water through the bath circulation path A circulation pump and a water supply-side hot water storage tank located at the most upstream side of the tank unit and connected to a water supply pipe, and the hot water of the tapping hot water storage tank after heat exchange by the hot water heat exchanger is supplied to the water supply-side hot water storage tank In addition to the guiding structure, a heat exchange pipe for forming the bath circulation path is provided in the hot water heat exchanger.

And by connecting a plurality of hot water storage tanks in series, it is not necessary to increase the depth dimension of the device body even if the hot water storage capacity is increased. Furthermore, since the hot water in the hot water storage tank after the heat exchange with the hot water heat exchanger is guided to the hot water storage tank, the downstream hot water storage tank has hot water used to reheat the bath water. The amount of hot water equal to the amount used for hot water supply or hot water supply is supplied from the upstream hot water storage tank, allowing high-temperature hot water to be used efficiently without waste, and is economical and suitable for Japanese housing conditions Can be provided.

  The hot water storage type hot water supply apparatus described in claim 2 is configured to guide the hot water in the tapping hot water storage tank after heat exchange with the hot water heat exchanger to the lower part of the hot water supply hot water storage tank.

  And since the low temperature water after heat exchange with the hot water heat exchanger is guided to the lower part of the water supply side hot water storage tank, the hot water and the low temperature water in the water supply side hot water storage tank are mixed, and the temperature of the hot water is not lowered. Only the hot water in the hot water storage tank can be reliably supplied to the hot water storage tank. In addition, because hot water can be used reliably, the heat exchange efficiency of the hot water heat exchanger can be improved, the bath water can be replenished in a short time, and the hot water heat exchanger can be downsized. Space-saving and easy-to-use equipment can be provided.

  In the hot water storage type hot water supply apparatus according to claim 3, since the hot water for hot water supply uses the hot water of the hot water supply side hot water storage tank, the hot water of the hot water is kept downstream until the hot water of the hot water supply side hot water storage tank runs out. Hot water that is supplied to the hot water storage tank and boiled up can be used without waste.

  The hot water storage type hot water supply apparatus described in claim 4 is configured such that the hot water heat exchanger is connected to the hot water storage tank by piping, so that hot water remains downstream until there is no hot water in the upstream hot water storage tank. It is possible to provide an easy-to-use device that is supplied to the tank and is less likely to run out of water due to reheating of the bathtub water.

  The hot water storage type hot water supply apparatus described in claim 5 uses a heat pump unit as a heating means and heats low temperature water led from the lower part of the hot water storage tank, so that COP (energy consumption efficiency) can be improved. It is possible to provide a high-efficiency device that can provide benefits at a running cost that meets the user's expectations.

  In the hot water storage type hot water supply apparatus according to claim 6, since the hot water heated by the heat pump unit is supplied to the tapping hot water storage tank or the hot water supply hot water storage tank by the hot water supply flow path switching means, High temperature hot water can be efficiently secured for use or hot water supply, there is no worry of temporary hot water out, easy-to-use equipment can be provided, and only the hot water storage tank is supplied by the hot water supply channel switching means The hot water storage tank has high temperature hot water, but when most of the hot water storage tank is low temperature water, it is possible to boil hot water efficiently in a short time. Can provide economical equipment.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
1 is a system configuration diagram of a hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a partial cross-sectional perspective view of the hot water storage type hot water supply apparatus.

1 and 2, 1 is an electric water heater product, 2 is a cylindrical water supply side hot water storage tank, 3 is a water supply pipe, 4 is a pressure reducing valve for reducing the water pressure, 5 is a water pipe, and 6 is a cylindrical shape. The hot water supply side hot water storage tank 7 is a connecting pipe that connects the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 in series. The water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 form a tank unit. 8A is a heater serving as a hot water side heating means attached so as to face the hot water side hot water storage tank 6, 8B is a water supply side heater serving as a heating means attached so as to face the water supply side hot water storage tank 2, 9 Opening ratio of a valve body (not shown) that is connected to a hot water supply pipe 10 and a water pipe 5 that are connected to a hot water storage tank 6 by an electric mixing valve and that is built in according to a set temperature. It is set as the structure which obtains mixed water of desired temperature by controlling. Reference numeral 11 denotes an incoming thermistor which is a temperature detector for detecting the temperature of the mixed water, and reference numeral 12 denotes a hot water outlet pipe which is connected to a currant 13 which is a hot water supply port. A bath pouring open / close valve 14 is connected to a bath pipe 15 branched from the hot water pipe 12. Reference numeral 16 denotes a bathtub, which is connected to the electric water heater 1 and has a bathtub circulation port 17 for performing hot water filling and reheating to the bathtub 16. Reference numeral 18 is a forward pipe, 19 is a return pipe, 20 is a forward pipe connection port, and 21 is a return pipe connection port. In addition, the electric water heater 1 passes through a cylindrical hot water heat exchanger 25 having a built-in heat exchange pipe 24 via a bath thermistor 22 that detects the temperature of the bath water from the return pipe connection port 21 and a bath circulation pump 23. It connects so that it may return to the outgoing pipe connection port 20, and the path | route of a bath circulation is formed. The hot water heat exchanger 25 is connected by a return pipe 26 and a return pipe 27 connected to the hot water storage tank 6, and the forward pipe 26 is connected to the upper part of the hot water storage tank 6, and the return pipe. A circulation pump 28 is attached to the hot water storage tank 25 so that the hot water in the hot water storage tank 6 is introduced into the hot water heat exchanger 25 and the low temperature water after heat exchange with the heat exchange pipe 24 is returned to the lower part of the hot water storage tank 2. ing. Reference numeral 29 denotes a bath pouring branch pipe, one of which is connected to the bath circulation pump 23 by piping, and the other is connected to the heat exchange pipe 24 so as to fill the bathtub 16 through the bath circulation path.

  Next, the operation will be described with the above configuration. First, when boiling is performed, the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 are filled with water, and the water is heated by the hot water supply side heater 8A and the water supply side heater 8B using midnight power. Start. When the hot water temperature in the hot water supply side hot water storage tank 6 and the hot water supply side hot water storage tank 2 reaches a predetermined temperature and the boiling is completed, energization to the hot water supply side heater 8A and the hot water supply side heater 8B is stopped.

  Next, when hot water is supplied, when the currant 13 is opened, the hot water temperature detected by the incoming water thermistor 11 is compared with the set temperature, and the hot water in the hot water storage tank 6 is heated by the mixing valve 9 so that the set temperature is reached. Tap water from the water pipe 5 is mixed. On the other hand, hot water is discharged from the hot water storage tank 6 into the hot water storage tank 2, and at the same time, tap water is supplied from the water supply pipe 3 to the hot water storage tank 2 through the water pipe 5, and simultaneously at the water supply side. Hot water in the upper part of the hot water storage tank 2 is supplied to the hot water storage tank 6 through the connecting pipe 7. That is, as long as there is hot water in the water supply side hot water storage tank 2, hot water is always supplied to the hot water outlet side hot water storage tank.

  Next, when filling the bathtub 16, when an automatic filling switch (not shown) of the bath remote controller is turned on, the bath pouring on / off valve 14 is turned on and the filling is started. The hot water mixed at the set temperature by the mixing valve 9 passes through the bath pipe 15 and is supplied to the bath circulation path from the bath pouring on / off valve 14 which is in the valve open state. When the hot water filling is completed, the bath pouring on / off valve 14 is turned off and the valve is closed. When the hot water is filled in the bathtub 16, the tap water is supplied from the water supply pipe 3 through the water pipe 5 into the water supply side hot water storage tank 2 and simultaneously supplied with water as in the case where hot water is supplied from the curan 13. Hot water in the upper part of the side hot water storage tank 2 is supplied to the hot water storage hot water storage tank 6 through the connecting pipe 7. That is, as long as there is hot water in the water supply side hot water storage tank 2, the hot water is always supplied to the hot water supply side hot water storage tank 6.

Next, the bath water reheating operation will be described. Bath water is driven by the bath circulation pump 23 at regular intervals and returned from the return pipe 19 to the bathtub 16 through the hot water heat exchanger 25 and from the outgoing pipe 18. During this time, the temperature of the bath water is detected by the bath thermistor 21, and if it is lower than the set temperature, the circulation pump 28 is driven to circulate the hot water in the hot water storage hot water tank 6 into the hot water heat exchanger 25 and the heat exchange pipe 24 The water is heated. The hot water led from the hot water storage tank 6 exchanged by the hot water heat exchanger 25 becomes low temperature water and is led to the lower part of the hot water storage tank 2, and at the same time the hot water in the upper part of the hot water storage tank 2 is connected to the connecting pipe 7. The hot water is supplied to the hot water storage tank 6 through the hot water. That is, as long as there is hot water in the water supply side hot water storage tank 2, hot water necessary for reheating the bathtub water is always supplied to the hot water supply side hot water storage tank. When the bath water recovers to the set temperature, the bath circulation pump 23 and the circulation pump 28 are stopped, and the reheating heating operation is completed.

  In this embodiment, the case where two hot water storage tanks, ie, the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 are connected in series, has been described. The same operation can be performed by connecting hot water storage tanks in series.

(Embodiment 2)
FIG. 3 is a system configuration diagram of a hot water storage type hot water supply apparatus in Embodiment 2 of the present invention.

  In FIG. 3, 30 is an upper connecting pipe that pipe-connects the top of the water supply-side hot water storage tank 2 and the top of the hot-water supply-side hot water storage tank 6, and 31 is a pipe connection between the lower part of the hot-water supply-side hot water storage tank 6 and the lower part of the water-supply-side hot water storage tank 2. A boiling pump 32 is attached to the lower connecting pipe 31 in the middle of the lower connecting pipe 31 so that hot water is circulated between the hot water storage tank 6 and the hot water storage tank 2. M is a hot water temperature thermistor for detecting the hot water temperature in the hot water storage tank 6. Reference numeral 33 denotes a built-in heat exchange pipe that exchanges heat in the hot water storage tank 6 and reheats the bath water. In this built-in heat exchange pipe 33, the primary side pipe 33 </ b> A is connected to the bath pouring branch pipe 29, and the secondary side pipe 33 </ b> B is connected to the outgoing pipe 18. Further, a bypass circulation pipe 35 connected to the secondary side pipe 33B is connected to the primary side pipe 33A via a flow path switching valve 34. The flow path switching valve 34 controls whether the bath water led to the primary side pipe 33A is heated in the hot water storage hot water storage tank 6 or flows through the bypass circulation pipe 35 to the secondary side pipe 33B. ing. That is, inside the electric water heater 1, the bath pouring branch pipe 29, the primary side pipe 33 </ b> A, and the bypass circulation pipe 35 are connected via the bath thermistor 22 that detects the temperature of the bath water from the return pipe connection port 21 and the bath circulation pump 23. Streets are connected so as to return to the forward pipe connection port 20 to form a bath circulation path.

  Next, the operation will be described with the above configuration. First, when boiling is performed, water is supplied to the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 to fill the water, and heating of the water by the heater 8 is started using midnight power. At the same time, the boiling pump 32 is driven to circulate the water in the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 through a route passing through the upper connection pipe 30 and the lower connection pipe 31, and the hot water temperature reaches a predetermined temperature and is heated. When is completed, energization of the heater 8 and driving of the boiling pump 32 are stopped.

  Next, when hot water is supplied, when the currant 13 is opened, the hot water temperature detected by the incoming water thermistor 11 is compared with the set temperature, and the hot water in the hot water storage tank 6 is heated by the mixing valve 9 so that the set temperature is reached. Tap water from the water pipe 5 is mixed. On the other hand, hot water is discharged from the hot water storage tank 6 into the hot water storage tank 2, and at the same time, tap water is supplied from the water supply pipe 3 to the hot water storage tank 2 through the water pipe 5, and simultaneously at the water supply side. Hot hot water at the upper part of the hot water storage tank 2 is supplied to the hot water storage tank 6 through the upper connecting pipe 30. At the same time, a small amount of water in the lower part of the water supply side hot water storage tank 2 enters the hot water supply side hot water storage tank 6 through the lower connecting pipe 31. Since the boiling pump 32 is attached in the middle of the lower connecting pipe 31, the flow resistance is large, and the amount of water flowing from the water supply side hot water storage tank 2 to the hot water supply side hot water storage tank 6 is small. Therefore, as long as there is hot water in the water supply side hot water storage tank 2, the hot water is always supplied to the hot water supply side hot water storage tank 6.

Next, when filling the bathtub 16 with hot water, the same as in the first embodiment, when the automatic hot water filling switch (not shown) of the bath remote control is turned on, the bath pouring on / off valve 14 is turned on to open the hot water. Tensioning starts. The hot water mixed at the set temperature by the mixing valve 9 passes through the bath pipe 15 and is supplied to the bath circulation path from the bath pouring on / off valve 14 which is in the valve open state. When the hot water filling is completed, the bath pouring on / off valve 14 is turned off and the valve is closed. When the hot water is filled in the bathtub 16, hot water is always supplied to the hot water supply side hot water storage tank 6 as long as hot water is supplied to the hot water supply side hot water storage tank 2 as in the case where hot water is supplied from the currant 13.

  Next, the bath water heating operation heating will be described. Bath water is driven by the bath circulation pump 23 at regular intervals, and returned from the return pipe 19 to the bathtub 16 through the bypass circulation pipe 35. During this time, the temperature of the bath water is detected by the bath thermistor 21. If the temperature is lower than the set temperature, the flow path switching valve 34 is driven to flow the bath water to the built-in heat exchange pipe 33 side. It is designed to heat up and heat up. When the bath water recovers to the set temperature, the bath circulation pump 23 stops and the reheating heating operation is completed. On the other hand, the hot water in the hot water storage tank 6 that has exchanged heat with the built-in heat exchange pipe 33 becomes low temperature water and falls to the lower part of the hot water storage tank 6. When the hot water thermistor M detects that the amount of low temperature water in the hot water storage tank 6 reaches a predetermined amount, the boiling pump 32 is driven to connect the low temperature water below the hot water storage tank 6 to the lower part. The pipe 31 is moved to the lower part of the water supply side hot water storage tank 2. At the same time, hot hot water at the top of the water supply side hot water storage tank 2 is supplied to the hot water supply side hot water storage tank 6 through the upper connecting pipe 30. That is, as long as there is hot water in the water supply side hot water storage tank 2, hot water necessary for reheating the bathtub water is always supplied to the hot water supply side hot water storage tank 6.

  In this embodiment, the case where two hot water storage tanks, ie, the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 are connected in series, has been described. The same operation can be performed by connecting hot water storage tanks in series.

  Further, the heating heater 8 may be provided in each of the hot water storage tank 6 and the hot water storage tank 2, or the heater 8 may be provided in all the hot water storage tanks connected in series.

(Embodiment 3)
FIG. 4 is a system configuration diagram of a hot water storage type hot water supply apparatus according to Embodiment 3 of the present invention. Although Example 1 was a system that uses a heater as a heating means to boil hot water, Example 3 is greatly different in that a heat pump unit is used as the heating means.

  In FIG. 4, reference numeral 36 denotes a heat pump unit that collects atmospheric heat into a refrigerant and heats water through a heat exchanger, and is a boiling unit attached in the middle of a water supply pipe 37 connected to the lower part of the hot water storage tank 2. Water is supplied via the pump 32. A heating pipe 38 supplies the hot water heated by the heat pump unit 36 to the hot water storage tank 6 or the hot water storage tank 2. A hot water supply channel switching means 39 is attached in the middle of the boiling pipe 38 so as to switch whether the hot water heated by the heat pump unit flows to the outlet hot water storage tank 6 side or the hot water supply hot water storage tank 2 side. It has become. A hot water supply branch pipe 38 </ b> A connects the hot water supply flow path switching means 39 and the water supply side hot water storage tank 2 by piping.

  Next, the operation will be described with the above configuration. First, when the first boiling is performed after the equipment is installed, the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 are filled with water, and the heat pump unit 36 starts heating the water using midnight power. To do. At the same time, the boiling pump 32 is driven to circulate the water in the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6. When the hot water temperature reaches a predetermined temperature and the boiling is completed, heating in the heat pump unit 36 and driving of the boiling pump 32 are stopped.

Next, when the hot water is supplied, when the hot water is filled in the bathtub 16 and when the hot water is reheated, the operation is exactly the same as that of the first embodiment. In particular, after the reheating is performed, boiling is always performed using the low temperature water led to the lower part of the water supply side hot water storage tank 2, so that the efficiency of heat exchange with the refrigerant gas heated to a high temperature is improved. The merit of using the heat pump unit 36 as the heating means can be obtained.

  Next, the operation when boiling the hot water in the hot water storage tank is described again. First, almost all of the hot water in the water supply side hot water storage tank 2 and the hot water supply side hot water storage tank 6 is used up for hot water supply, or the bath water is reheated several times, and the water supply side hot water storage tank 2 becomes low temperature water. In the case where boiling is performed from a state where most or all of the tank 6 is also low-temperature water, the hot water supply channel switching means 39 is controlled so as to guide the hot water heated by the heat pump unit 36 to the hot water storage tank 6 side. It is designed to efficiently supply high-temperature water that can be used for reheating bath water and hot water supply.

  Next, after almost all the hot water in the hot water supply side hot water storage tank 6 has been used up for hot water supply or after the bath water has been reheated, the hot water supply side hot water storage tank 6 is filled with hot water, and the hot water supply side hot water storage tank 2 side When heating is performed from a state in which almost all is low-temperature water, the hot water supply channel switching means 39 is controlled so that heating by the heat pump unit 36 can be performed only on the water supply side hot water storage tank 2 side. By forming a path that circulates through the tank 2, the water supply pipe 37, the heat pump unit 36, and the boiling pipe 38, the boiling is efficiently performed in a short time.

  In the present embodiment, the case where two hot water storage tanks, ie, a water supply side hot water storage tank and a hot water supply side hot water storage tank are connected in series, has been described. The same operation can be performed by connecting hot water storage tanks in series.

  Further, the hot water heated by the heat pump unit 36 can be controlled by providing a plurality of hot water supply channel switching means 39 in the boiling pipe 38 so that the hot water can be supplied to each of the plurality of hot water storage tanks as required.

The system block diagram of the hot water storage type hot-water supply apparatus in Example 1 of this invention Partial sectional perspective view of the hot water storage type hot water supply apparatus The system block diagram of the hot water storage type hot-water supply apparatus in Example 2 of this invention The system block diagram of the hot water storage type hot-water supply apparatus in Example 3 of this invention System configuration diagram of a conventional hot water storage hot water supply system

Explanation of symbols

2 Water supply side hot water storage tank 3 Water supply pipe 6 Hot water outlet side hot water storage tank 8 Heating means 16 Bathtub 23 Bath circulation pump 25 Hot water heat exchanger

Claims (6)

Reheating bath water using a tank unit configured by connecting in series a plurality of hot water storage tanks that store hot water heated by heating means, and hot water of a hot water storage tank located on the most downstream side of the tank unit. A hot water heat exchanger, a bath circulation path through which the bath water circulates via the hot water heat exchanger, a bath circulation pump that circulates the bath water in the bath circulation path, and the most upstream side of the tank unit. A hot water storage tank that is positioned and connected to the hot water supply pipe, and is configured to guide the hot water of the tapping hot water storage tank after the heat exchange with the hot water heat exchanger to the hot water storage tank, and in the hot water heat exchanger A hot water storage type hot water supply apparatus characterized in that a heat exchange pipe for forming the bath circulation path is provided in the hot water storage system. The hot water storage type hot water supply apparatus according to claim 1, wherein the hot water of the tapping hot water storage tank after the heat exchange with the hot water heat exchanger is guided to the lower part of the hot water storage hot water storage tank. The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein hot water for hot water supply is configured to use hot water of a tapping hot water storage tank. The hot water storage hot water supply apparatus according to any one of claims 1 to 3, wherein the hot water heat exchanger is configured to be connected to a hot water storage tank by piping. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4, wherein a heat pump unit is used as a heating means to heat low temperature water led from a lower part of a water supply side hot water storage tank. 6. The hot water storage type hot water supply apparatus according to claim 5, wherein the hot water heated by the heat pump unit is supplied to the hot water storage hot water storage tank or the hot water supply hot water storage tank by the hot water supply flow path switching means.

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