JP2012172943A - Storage type hot water-supply bath device and storage type hot water-supply heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type hot water-supply bath device and a storage-type hot water-supply heating device including an indirect heat exchanger of high heat exchange efficiency in a hot water storage tank.SOLUTION: This storage type hot water-supply bath device includes: a hot water storage tank 2 constituted of a turned-down bowl-shaped upper barrel head 212, a cylindrical barrel 213 and a bowl-shaped lower barrel head 214, and storing hot water/water inside; a heating means 3 for heating hot water/water in the hot water storage tank 2; a hot water supply circuit 25 for supplying the hot water/water in the hot water storage tank 2; the indirect heat exchanger 26 disposed in the upper barrel head 212 and heating the bathtub water circulated in a heat receiving pipe 26a by utilizing heat of the hot water/water in the hot water storage tank 2; and a bath circulation circuit 27 for circulating the bathtub water in a bathtub 7 to the indirect heat exchanger 26. In the indirect heat exchanger 26, the heat receiving pipe 26a has the spiral shape a winding diameter of which is gradually reduced downward, so that the convection flow of hot water/water in the hot water storage tank 2 around the indirect heat exchanger 26 is not prevented in reheating the bathtub water, and the heat exchange efficiency in the indirect heat exchanger 26 can be improved.

Description

  The present invention relates to a hot water storage hot water bath apparatus and a hot water storage hot water heater.

  Conventionally, this type of hot water storage hot water bath apparatus has been shown in FIG. 110 is a hot water storage tank for storing hot water, 120 is a heating means for heating the hot water in the hot water storage tank 110, 130 is a hot water supply circuit for supplying hot water in the hot water storage tank 110, 140 is a bathtub, and 150 is disposed in the hot water storage tank 110. An indirect heat exchanger that heats and heats the bathtub water in the heat receiving pipe 150a with hot water in the hot water storage tank 110, 160 is a bath in which the bathtub water and the indirect heat exchanger 150 are connected in a ring shape so that the bath water can circulate. It is a circulation circuit.

  As shown in FIG. 6, the hot water storage tank 110 includes a cover-like upper end plate 111, a cylindrical body 112, and a bowl-like lower end plate 113, and a side peripheral surface of the upper end plate 111. The end of the heat receiving pipe 150a is connected to the connection hole 114 provided in the upper end of the upper end plate 111 and the connection hole 115 provided on the upper surface of the upper end plate 111, and the indirect heat having a spiral shape with the same winding diameter in the upper end plate 111 The exchanger 150 was provided.

  According to the above configuration, the bath water in the bathtub 140 is circulated through the bath circulation circuit 160 and circulated through the heat receiving pipe 150a in the hot water storage tank 110, so that the bath water in the bathtub 140 can be retreated or kept warm. There was a thing (for example, refer to patent documents 1).

JP 2003-214711 A

  However, in this conventional one, the indirect heat exchanger 150 has a spiral shape with the same winding diameter, and as shown in FIG. 7, the upper and lower adjacent heat receiving tubes 150a are arranged in a straight line so In this case, the hot water in the hot water storage tank 110 around the indirect heat exchanger 150 is cooled by heat exchange with the bath water and becomes a downward flow, and the upward flow flows in the center of the indirect heat exchanger 150 corresponding to the downward flow. However, as indicated by the downward arrows in FIG. 7, the downward flow generated by the heat exchange of the upper heat receiving pipe 150a among the upper and lower adjacent heat receiving pipes 150a is the lower heat receiving pipe 150a. Therefore, the convection of hot water in the hot water storage tank 110 due to the upward flow and the downward flow is not well formed, and the heat exchange efficiency in the indirect heat exchanger 150 may be deteriorated.

  On the other hand, in order to solve the above-mentioned drawbacks, as shown in FIG. 8, the indirect heat exchanger 151 may be formed in a spiral shape in which the winding diameter increases toward the lower direction. As shown in the figure, the high-temperature upward flow and the downward flow generated by the heat exchange of the upper heat receiving pipe 151a collide with each other inside the indirect heat exchanger 151, and the problem that the efficient heat exchange is not performed again. It was what had.

  Therefore, in order to solve the above-mentioned problems, the present invention particularly comprises a cover-like upper end plate, a cylindrical body, and a bowl-like lower end plate, and hot water is provided inside. A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a hot water supply circuit for supplying hot water in the hot water storage tank, and the heat of the hot water in the hot water storage tank provided in the upper end plate In the hot water storage hot water bath apparatus comprising an indirect heat exchanger that heats the bathtub water flowing through the heat receiving pipe and a bath circulation circuit that circulates the bathtub water in the bathtub to the indirect heat exchanger, the indirect heat exchanger includes: The heat-receiving tube has a spiral shape such that the winding diameter decreases as it goes downward.

  According to a second aspect of the present invention, the indirect heat exchanger is formed so that the inner edge portion of the upper heat receiving tube is located outside the outer edge portion of the lower heat receiving tube in the upper and lower adjacent heat receiving tubes. It was supposed to be.

  According to a third aspect of the present invention, there is provided a hot water storage tank for storing hot water and a hot water in the hot water storage tank. The hot water storage tank is configured by a cover-shaped upper end plate, a cylindrical body, and a bowl-shaped lower end plate. A heating means, a hot water supply circuit for supplying hot water in the hot water storage tank, and an indirect heat exchanger that is provided in the upper end plate and obtains heat from the hot water in the hot water storage tank and heats the circulating circulating water flowing through the heat receiving pipe And a hot water storage hot water supply / heater apparatus that circulates the heating circulating water of the hot water heating terminal to the heat receiving pipe, the winding diameter of the indirect heat exchanger decreases as the heat receiving pipe goes downward. The spiral shape was as follows.

  According to a fourth aspect of the present invention, the indirect heat exchanger is formed so that an inner edge portion of the upper heat receiving tube is located outside an outer edge portion of the lower heat receiving tube in the upper and lower adjacent heat receiving tubes. It was supposed to be.

  According to the first aspect of the present invention, the indirect heat exchanger is provided in the uppermost end panel where the hot water stored in the hot water storage tank has the highest temperature. Therefore, the indirect heat exchanger has a spiral shape in which the winding diameter decreases as it goes downward. Therefore, when the bath water is replenished, the convection of the hot water in the surrounding hot water storage tank provided with the indirect heat exchanger is performed smoothly and smoothly without colliding, so the heat exchange efficiency in the indirect heat exchanger Can be improved.

  Further, according to claim 2, the indirect heat exchanger is formed so that the inner edge portion of the upper heat receiving tube is located outside the outer edge portion of the lower heat receiving tube in the upper and lower adjacent heat receiving tubes. Thus, when the bath water is replenished, the downward flow of hot water in the hot water storage tank that is cooled by heat exchange with the bath water flowing through the upper heat receiving pipe is not hindered by the lower heat receiving pipe, In addition, there is no collision with the high temperature upward flow toward the heat receiving pipe, and the convection of hot water in the hot water storage tank is well formed, so that the heat exchange efficiency in the indirect heat exchanger can be improved.

  According to the third aspect of the present invention, since the indirect heat exchanger is provided in the uppermost end plate having the highest temperature of the hot water stored in the hot water storage tank, the heating capacity for heating is large. The indirect heat exchanger has a spiral shape with a winding diameter that decreases toward the bottom of the heat receiving pipe. As a result, hot water convection in the surrounding hot water storage tank provided with the indirect heat exchanger is well formed when heating by the hot water heating terminal, so that the heat exchange efficiency in the indirect heat exchanger can be improved. It is something that can be done.

  According to claim 4, the indirect heat exchanger is formed so that the inner edge portion of the upper heat receiving tube is located outside the outer edge portion of the lower heat receiving tube in the upper and lower adjacent heat receiving tubes. Thus, when heating by the hot water heating terminal, the downward flow of hot water in the hot water storage tank that is cooled by heat exchange with the heating circulating water flowing through the upper heat receiving pipe is not hindered by the lower heat receiving pipe. In addition, since the hot water convection in the hot water storage tank is well formed without collision with the high temperature upward flow toward the heat receiving pipe, the heat exchange efficiency in the indirect heat exchanger can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water storage type hot-water bath apparatus of one Embodiment of this invention. Sectional drawing of the hot water storage tank of the same embodiment. The principal part enlarged view of the indirect heat exchanger enclosed with the dotted line in FIG. The schematic block diagram of the hot water storage type hot-water supply heating apparatus of other embodiment. The schematic block diagram of the conventional hot water storage type hot water bath apparatus. Sectional drawing of the conventional hot water storage tank. The principal part enlarged view of the indirect heat exchanger enclosed with the dotted line in FIG. Sectional drawing of the other conventional hot water storage tank. The principal part enlarged view of the indirect heat exchanger enclosed with the dotted line in FIG.

Next, one embodiment of the hot water storage hot water bath apparatus of the present invention will be described with reference to FIGS.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a heat pump unit as a heating means for heating the hot water in the hot water storage tank 2, and 4 is hot water circulating through the hot water storage tank 2 and the heat pump unit 3. An annularly connected heating circulation circuit, 5 is a hot water tap as a hot water supply terminal provided in a kitchen or a washroom, 6 is a remote control for remotely operating the hot water storage hot water bath apparatus, and 7 is a bathtub.

  The heat pump unit 3 includes a compressor 8 that compresses the refrigerant, and a water refrigerant heat exchanger that exchanges heat between the high-temperature and high-pressure refrigerant discharged from the compressor 8 and hot water in the hot water storage tank 2 that circulates in the heating circulation circuit 4. 9, an electronic expansion valve 10 as a decompressor for decompressing the refrigerant after passing through the water refrigerant heat exchanger 9, and an air heat exchanger 11 as an evaporator for evaporating the low-temperature and low-pressure refrigerant from the electronic expansion valve 10. A heat pump cycle 12 connected in a ring shape with a refrigerant pipe, a heating circulation pump 13 provided in the middle of the heating circulation circuit 4 for circulating hot water in the hot water storage tank 2, and a heat pump for controlling an actuator such as the compressor 8 in the heat pump unit 3 And a control unit 14, and carbon dioxide is used as a refrigerant in the heat pump cycle 12 to constitute a supercritical heat pump cycle.

  A water supply pipe 15 is connected to the lower part of the hot water storage tank 2 and supplies water to the hot water storage tank 2, 16 is a pressure reducing valve provided in the middle of the water supply pipe 15 to reduce the water supply pressure to a predetermined pressure, and 17 is provided in the middle of the water supply pipe 15. A water supply temperature sensor 18 for detecting the temperature of the hot water tank 18 is connected to the upper part of the hot water storage tank 2 and takes out hot water from the upper part of the hot water storage tank 2. An overpressure relief valve with a negative pressure operation valve, 20 is a water supply bypass pipe branched from the water supply pipe 15, and 21 is a mixing valve that mixes water supplied from the water supply bypass pipe 20 and hot water from the hot water discharge pipe 18 to a hot water supply set temperature. , 22 is a hot water supply pipe that supplies hot water mixed by the mixing valve 21 to the hot water tap 5, 23 is a hot water supply temperature sensor that is provided in the hot water supply pipe 22 and detects the hot water temperature after mixing by the mixing valve 21, and 24 is a hot water supply pipe 22. Established in A hot water supply flow sensor for counting the hot water flow rate is what constitutes a hot water supply circuit 25 thereby.

  26 is an indirect heat exchanger that is provided in the hot water storage tank 2 and uses the hot water in the hot water storage tank 2 as a heat source, obtains heat from the hot water, and heats and reheats the bathtub water in the bathtub 7. The vessel 26 has a spiral shape in which the winding diameter of the stainless steel heat receiving pipe 26a through which the bath water flows is reduced as it goes downward, and the inner edge of the upper heat receiving pipe 26a in the upper and lower adjacent heat receiving pipes 26a. Is formed outside the outer edge of the lower heat receiving pipe 26a, and a gap is formed between the heat receiving pipes 26a so that the heat receiving pipes 26a do not overlap with each other in a plan view as shown in FIG. It is what is done.

  Reference numeral 27 denotes an annular bath circulation circuit comprising a bath outlet pipe 28 and a bath return pipe 29 connecting the bathtub 7 and the indirect heat exchanger 26. The bath outlet pipe 28 circulates the bathtub water of the bathtub 7 to the indirect heat exchanger 26. The bath return pipe 29 is a bath pipe that returns the bathtub water circulated through the indirect heat exchanger 26 to the bathtub 7. Also, 30 is a bath circulation pump that is provided in the bath circulation circuit 27 and circulates bathtub water, 31 is a running water sensor that detects the presence or absence of running water, 32 is a bath temperature sensor that detects the temperature of bathtub water flowing through the bath circulation circuit 27, 33 is a water level sensor which detects the water level in the bathtub 7 from the water pressure of the bathtub water.

  Reference numeral 34 denotes a bath bypass pipe that bypasses the indirect heat exchanger 26 and connects the bath outlet pipe 28 and the bath return pipe 29. A flow path switching valve 35 comprising a three-way valve connects the bath bypass pipe 34 and the bath outlet pipe 28. The flow path switching valve 35 selectively switches whether hot water flowing through the bath circulation circuit 27 flows to the indirect heat exchanger 26 or not.

  Reference numeral 36 denotes a hot water pipe that branches off from the hot water supply pipe 22 and is connected to the bath circulation circuit 27 for pouring hot water into the bathtub 7. The hot water filling pipe 36 includes hot water for starting / stopping pouring of the hot water into the bathtub 7. A tension valve 37, a bath flow sensor 38 that counts the amount of pouring water into the bathtub 7, and a double check valve 39 that prevents the bathtub water in the bathtub 7 from flowing backward are provided. is there.

  A plurality of hot water storage temperature sensors 40 serving as hot water storage temperature detecting means arranged in the vertical direction of the hot water storage tank 2, and how much heat remains in the hot water storage tank 2 based on the temperature information detected by the hot water storage temperature sensor 40. While detecting, the temperature distribution in the up-down direction in the hot water storage tank 2 is detected.

  The remote controller 6 includes a hot water supply temperature setting switch 41 for setting the hot water supply set temperature, a bath temperature setting switch 42 for setting the bath set temperature, and a hot water amount setting switch ( The bath automatic switch 43 for pouring the hot water set in step (not shown) and keeping it warm for a predetermined time, and the bath water in the bathtub 7 are circulated through the heat receiving pipe 26a constituting the indirect heat exchanger 26 to make it chase. A hot switch 44 is provided.

  Reference numeral 45 denotes a hot water storage control unit as a control means for controlling the driving of each actuator in response to the start / stop control of the heat pump unit 3, the input of each sensor in the hot water storage tank unit 1, and the input of various switches of the remote controller 6. The hot water storage control unit 45 is connected to the remote controller 6 so as to be communicable wirelessly or by wire, and is connected to the heat pump control unit 14 so as to be communicable by wire.

  Here, the hot water storage tank 2 will be described based on the cross-sectional view shown in FIG. 2. The hot water storage tank 2 has a cover-like shape formed by deep drawing a stainless steel plate and has an opening 211 for hot water extraction at the top. The upper end plate 212, a body 213 formed of a stainless steel plate in a cylindrical shape, and a bowl-shaped lower end plate 214 formed of a stainless steel plate by deep drawing, the peripheral end of the upper end plate 212 and the body 213 The upper peripheral edge is welded and the peripheral edge of the lower end plate 214 and the lower peripheral edge of the body 213 are welded.

  The upper end plate 212 is provided with a side peripheral surface connection hole 215 on the side peripheral surface thereof and an upper surface connection hole 216 on the upper surface thereof, and one end side of the heat receiving pipe 26a is connected to the side peripheral surface connection hole 215 of the upper end plate 212. Inserted and fixed by welding, and the other end side of the heat receiving pipe 26a is inserted into the upper surface connection hole 216 of the upper end plate 212 and fixed by welding, so that it is downward in accordance with the cover shape of the upper end plate 212 A spiral indirect heat exchanger 26 is provided in the upper end plate 212 such that the winding diameter decreases toward the top. As described above, since the indirect heat exchanger 26 is housed in the upper end plate 212, the hot water stored in the hot water storage tank 2 can be provided at the highest temperature, and the bath water can be reheated or kept warm. Therefore, the heating capacity for the hot water can be increased, and the heat in the hot water storage tank 2 can be effectively used. Note that one end side of the heat receiving pipe 26a fixed to the side peripheral surface connection hole 215 is connected to the bath return pipe 29 via the side peripheral surface joint 217 and the heat receiving pipe 26a fixed to the upper surface connection hole 216. The other end side is connected to the bath outlet pipe 28 via the upper surface joint 218.

Next, the operation of the hot water storage hot water bath apparatus of this embodiment will be described.
First, the boiling operation in which the hot water in the hot water storage tank 2 is heated by the heat pump unit 3 will be described. The electric power unit price of the contract electric power according to the time zone becomes an inexpensive late night electric power time zone, and the hot water temperature sensor 40 is placed in the hot water storage tank 2. When it is detected that the necessary amount of heat does not remain on the next day, the hot water storage control unit 45 instructs the heat pump control unit 14 to start a boiling operation. Upon receiving the instruction, the heat pump control unit 14 starts driving the compressor 8 and the heating circulation pump 13, and supplies the low-temperature hot water supplied from the lower part of the hot water storage tank 2 via the heating circulation circuit 4 to the water refrigerant heat exchanger 9. The water is boiled to a high temperature, returned to the upper part of the hot water storage tank 2, and the hot water is stored sequentially by stacking from the upper part of the hot water tank 2. When the hot water storage temperature sensor 40 detects that the necessary amount of heat has been stored in the hot water storage tank 2, the hot water storage control unit 45 instructs the heat pump control unit 14 to stop the boiling operation, and receives the instruction. The unit 14 stops driving of the compressor 8 and the heating circulation pump 13 and ends the boiling operation.

Next, the reheating operation of bathtub water of the hot water storage type hot water bath apparatus of this embodiment will be described.
The operation of the hot water switch 44 of the remote controller 6 gives an instruction to refill the bathtub water in the bathtub 7 or a refill instruction given every predetermined time to keep the bathtub water in the bathtub 7 at a predetermined temperature. If there exists, the hot water storage control part 45 will switch the flow-path switching valve 35 to the indirect heat exchanger 26 side, will drive the bath circulation pump 30, and will receive the bathtub water in the bathtub 7 in the hot water storage tank 2 in the hot water receiving tank 26a. The bath water is heated using the heat of the hot water in the hot water storage tank 2.

  Here, the indirect heat exchanger 26 has a heat-receiving pipe 26a through which the bath water circulates in a spiral shape such that the winding diameter decreases as it goes downward, and as shown in FIG. The inner edge of the upper heat receiving pipe 26a is formed to be outside the outer edge of the lower heat receiving pipe 26a, and between the inner edge of the upper heat receiving pipe 26a and the outer edge of the lower heat receiving pipe 26a. When a gap is formed in the horizontal direction and the bath water is replenished, the hot water in the hot water storage tank 2 around the indirect heat exchanger 26 is received by a heat receiving pipe 26 a constituting the indirect heat exchanger 26. The water is cooled by the heat exchange with the bath water flowing through the water and becomes a downward flow, and an upward flow is generated at the center of the indirect heat exchanger 26 corresponding to the downward flow.

  At this time, as indicated by the downward arrows in FIG. 4, the hot water in the hot water storage tank 2 generated by the heat exchange with the bath water flowing through the upper heat receiving pipe 26a among the upper and lower adjacent heat receiving pipes 26a. The downflow is not hindered by the high temperature heating flow toward the lower heat receiving pipe 26a, and the high temperature heating flow (upflow) indicated by the arrow from the upward direction toward the heat receiving pipe 26a in FIG. 4 and the downward flow indicated by the downward arrow. Therefore, the convection of hot water in the hot water storage tank 2 is well formed, so that the heat exchange efficiency in the indirect heat exchanger 26 can be improved.

  Further, when hot water is supplied, hot water in the hot water storage tank 2 flows out from the hot water discharge pipe 18, and hot water flows in from the lower part of the hot water storage tank 2. Become. At this time, when reheating or keeping warm of the bath water is instructed, the bath water flows into the heat receiving pipe 26a serving as the indirect heat exchanger 26 and is heated by exchanging heat with the remaining hot water in the hot water storage tank 2. However, since the indirect heat exchanger 26 is provided in the upper end plate 212 and the height position where the indirect heat exchanger 26 is attached is the uppermost part in the hot water storage tank 2, Even if the amount of hot water storage is reduced, the hot water remaining in the hot water storage tank 2 can be used to retreat or keep warm the bath water, and the heat in the hot water storage tank 2 can be used effectively. is there.

  In addition, when the amount of hot water stored in the hot water storage tank 2 is reduced while the bath water is being reheated or kept warm, the indirect heat exchanger 26 is provided with the upper end plate when the boiling operation is performed. 212. Since the height position where the indirect heat exchanger 26 is attached is the uppermost part in the hot water storage tank 2, the hot water heated up by the heat pump unit 3 and returned to the upper part of the hot water storage tank 2 is bath water. It can be used immediately as heat for reheating or keeping warm.

  Further, in the indirect heat exchanger 26, as shown in FIG. 3, a gap is formed between the heat receiving pipes 26a so that the heat receiving pipes 26a do not overlap each other in plan view. 26a is set to be smaller than the pipe diameter of the pipe 26a, so that when the bathtub water is reheated, it is cooled by heat exchange with the bathtub water flowing through the upper heat receiving pipe 26a among the upper and lower adjacent heat receiving pipes 26a. Thus, the downward flow of the hot water in the hot water storage tank 2 is not disturbed by the high temperature heating flow (upflow) from the center to the lower heat receiving pipe 26a, and does not affect the lower heat receiving pipe 26a. The hot water convection in the hot water storage tank 2 is well formed, and the indirect heat exchanger 26 can be stored compactly in the upper end plate 212 without the winding diameter of the indirect heat exchanger 26 becoming too small.

  The present invention is not limited to this embodiment, and various modifications are possible without departing from the scope of the invention. For example, the present invention can also be used for a hot water storage type hot water supply / heating device. A hot water storage type hot water supply and heating apparatus according to another embodiment will be described with reference to FIG. In addition, the same thing as previous one Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  Here, reference numeral 46 denotes a hot water heating terminal such as a floor heating panel, and the heating circulating circuit 49 having a heating circulation pump 47 and a heating temperature sensor 48 is annularly connected to the indirect heat exchanger 26 so that the heating circulating water can circulate. It is what. Reference numeral 50 denotes a hot water supply / heating control unit that controls hot water supply and heating.

  When the start of heating is instructed by a heating remote controller (not shown) connected to the hot water supply / heating control unit 50, the hot water supply / heating control unit 50 drives the heating circulation pump 47 to store the heating circulation water in the hot water storage tank 2. The heated circulating water is heated by using the heat of the hot water in the hot water storage tank 2 through the heat receiving pipe 26a provided inside. Heating is performed by this heated circulating water flowing into the hot water heating terminal 46.

  During heating by the hot water heating terminal 46, the downward flow of hot water in the hot water storage tank 2 generated by heat exchange with the heating circulating water flowing through the upper heat receiving pipe 26a among the upper and lower adjacent heat receiving pipes 26a is: The indirect heat exchanger is formed with good convection of hot water in the hot water storage tank 2 by the upflow and downflow without hindering the flow of the high-temperature heating flow (upflow) from the center to the lower heat receiving pipe 26a. The heat exchange efficiency at 26 can be improved. Further, the indirect heat exchanger 26 is provided in the upper end plate 212, and the height position where the indirect heat exchanger 26 is attached is the uppermost part in the hot water storage tank 2, so that the hottest atmosphere in the hot water storage tank 2 is obtained. As a result, the heating capacity for heating by the hot water heating terminal 46 is large, and the start-up of the heating can be accelerated.

  Further, when hot water is supplied, hot water in the hot water storage tank 2 flows out from the hot water discharge pipe 18, and hot water flows in from the lower part of the hot water storage tank 2. Become. At this time, when heating is instructed, the heating circulating water flows into the heat receiving pipe 26a serving as the indirect heat exchanger 26, and heat is exchanged with the remaining high-temperature hot water in the hot water storage tank 2 to be heated and flow out. However, since the indirect heat exchanger 26 is provided in the upper end panel 212 and the height position where the indirect heat exchanger 26 is attached is the uppermost part in the hot water storage tank 2, the amount of hot water stored is reduced by hot water supply. However, the hot water remaining in the hot water storage tank 2 can be used as a heat source for hot water heating to the end, the heating time can be extended, and the heat in the hot water storage tank 2 can be used effectively. Is.

  In addition, when the amount of hot water stored in the hot water storage tank 2 decreases during the heating by the hot water heating terminal 46 and the boiling operation is to be performed, the indirect heat exchanger 26 is placed in the upper end panel 212. Since the height position where the indirect heat exchanger 26 is installed is the uppermost part in the hot water storage tank 2, the hot water heated by the heat pump unit 3 and returned to the upper part of the hot water storage tank 2 is immediately used as the heat of heating. It can be used for.

DESCRIPTION OF SYMBOLS 2 Hot water storage tank 212 Upper end panel 213 Body 214 Lower end panel 3 Heat pump unit 7 Bath 25 Hot water supply circuit 26 Indirect heat exchanger 26a Heat receiving pipe 27 Bath circulation circuit 46 Hot water heating terminal 49 Heating circulation circuit

Claims (4)

  A hot water storage tank comprising hot water for storing hot water therein, heating means for heating the hot water in the hot water storage tank, and the hot water storage tank, comprising a cover-like upper end plate, a cylindrical body, and a bowl-like lower end plate A hot water supply circuit for supplying hot water in the interior, an indirect heat exchanger for heating the bathtub water that flows through the heat receiving pipe using the heat of the hot water in the hot water storage tank provided in the upper end plate, and the bathtub water in the bathtub In the hot water storage hot water bath apparatus provided with a bath circulation circuit that circulates in the indirect heat exchanger, the indirect heat exchanger has a spiral shape in which the winding diameter decreases toward the lower side of the heat receiving pipe. Hot water storage hot water bath equipment characterized by.   The said indirect heat exchanger is formed so that the inner edge part of the upper said heat receiving pipe may come outside the outer edge part of the lower said heat receiving pipe in the said heat receiving pipe adjacent vertically. The hot water storage hot water bath apparatus according to 1.   A hot water storage tank comprising hot water for storing hot water therein, heating means for heating the hot water in the hot water storage tank, and the hot water storage tank, comprising a cover-like upper end plate, a cylindrical body, and a bowl-like lower end plate A hot water supply circuit for supplying hot water in the water, an indirect heat exchanger for heating the circulating water that is provided in the upper end panel and obtains heat from the hot water in the hot water storage tank and circulates through the heat receiving pipe, and heating of the hot water heating terminal In the hot water storage hot water supply and heating apparatus provided with a heating circulation circuit that circulates circulating water to the heat receiving pipe, the indirect heat exchanger has a spiral shape such that the winding diameter decreases toward the lower side of the heat receiving pipe. A hot-water storage hot-water heater characterized by that.   The said indirect heat exchanger is formed so that the inner edge part of the upper said heat receiving pipe may come outside the outer edge part of the lower said heat receiving pipe in the said heat receiving pipe adjacent vertically. 3. A hot-water storage hot-water heater according to 3.

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