JP2019215092A - Water heater - Google Patents

Abstract

To provide a water heater which achieves energy saving by taking out hot water at a middle part in a hot water storage tank and inhibition of heat radiation loss of the hot water storage tank by providing a hot water outlet in the middle part.SOLUTION: A water heater includes: a hot water storage tank which stores heated hot water flowing thereinto; a heat pump which heats the hot water taken out from the hot water storage tank; an upper outlet for taking out the hot water from an upper part of the hot water storage tank; a lower outlet for taking out the hot water from a lower part of the hot water storage tank; a middle outlet which is provided between the upper outlet and the lower outlet in a vertical direction of the hot water storage tank to take out the hot water from a middle part of the hot water storage tank; a mixing valve which mixes the hot water from the upper outlet, the lower outlet, and the middle outlet; and a hot water supply terminal which is connected to the mixing valve and to which the mixed hot water is supplied. The middle outlet is formed on a side surface of the hot water storage tank and formed so that a vertical dimension is larger than a horizontal dimension.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a hot water supply apparatus, and more particularly, to a structure of an outlet of a hot water storage tank and a heat insulating material of the hot water storage tank.

  In recent years, a hot water supply system using a refrigeration cycle and a hot water storage tank for hot water supply for a house has been widely used for energy saving. In order to save energy, there has been proposed a system that not only increases the efficiency of a refrigeration cycle but also efficiently uses hot water having a different amount of heat depending on the location in a hot water storage tank (for example, see Patent Document 1). In Patent Literature 1, energy efficiency is achieved by effectively utilizing a heat called medium-temperature water of about 20 ° C. to 40 ° C. existing in the center of the tank, thereby increasing the efficiency of a refrigeration cycle during boiling. In addition, in order to suppress heat radiation from the hot water storage tank, a vacuum heat insulating material (VIP) is often provided on the tank surface.

Japanese Patent No. 5023608

  In the above-mentioned Patent Document 1, when using hot water present in the middle part of the hot water storage tank, it is necessary to provide an outlet, but heat of the hot water leaks from the vicinity of the outlet to the outside air, and heat radiation loss occurs. I was

  Further, a vacuum heat insulating material having a high heat insulating performance has a property that the heat insulating performance is low at the end face. When the vacuum heat insulating material is installed in accordance with the outlet for taking out hot water provided in the hot water storage tank, the end of the vacuum heat insulating material around the outlet is complicated in shape. Therefore, even if a vacuum heat insulating material is applied around the outlet, heat is radiated by the thermal bridge, and there is a problem that it is difficult to improve the heat insulating performance of the heat insulating structure using the vacuum heat insulating material.

  The present invention has been made in order to solve the above-described problem, and conserves energy by removing hot water from a central portion of a hot water storage tank, and provides a hot water supply device that suppresses heat radiation loss by providing a central hot water outlet. To provide.

  A hot water supply device according to the present invention is a hot water storage tank that stores heated hot water thereinto, a heat pump that heats hot water taken out of the hot water storage tank, and an upper outlet that takes out hot water from an upper portion of the hot water storage tank, A lower outlet for taking out hot water from a lower portion of the hot water storage tank, and a middle outlet for taking out hot water from a middle part of the hot water storage tank provided between the upper outlet and the lower outlet in the vertical direction of the hot water storage tank. A mixing valve for mixing hot and cold water from the upper outlet, the lower outlet, and the middle outlet, and a hot water supply terminal connected to the mixing valve and supplied with mixed hot and cold water, The mouth is formed on the side surface of the hot water storage tank, and has a vertical dimension larger than a horizontal dimension.

  According to the present invention, with the above-described configuration, since the hot water can be supplied to the hot water supply terminal from the vertical central portion of the hot water storage tank by providing the middle outlet, the efficiency of the heat pump can be improved, and energy can be saved. Become. In addition, when the heat insulating material is installed in the hot water storage tank, the central outlet is configured to be flat so that the area of the side surface of the hot water storage tank covered by the heat insulating material increases. Therefore, the amount of heat radiation from the hot water storage tank can be suppressed, and high efficiency of the hot water supply device can be realized.

It is a schematic diagram showing the whole hot water supply system composition concerning an embodiment. FIG. 3 is a control block diagram of the hot water supply apparatus according to Embodiment 1. FIG. 3 is an explanatory diagram of a temperature distribution in a hot water storage tank of the hot water supply device according to Embodiment 1. FIG. 3 is an explanatory diagram of a temperature distribution in a hot water storage tank of the hot water supply device according to Embodiment 1. FIG. 3 is an explanatory diagram of a temperature distribution in a hot water storage tank of the hot water supply device according to Embodiment 1. FIG. 4 is an explanatory diagram showing changes in the pressure and enthalpy of the refrigerant of the heat pump unit during boiling in the hot water supply apparatus according to Embodiment 1. FIG. 3 is a side view of the hot water storage tank according to the first embodiment. It is explanatory drawing of the cross-section of the hot water storage tank of FIG. It is explanatory drawing of the structure of the vacuum heat insulating material shown in FIG. 7 and FIG. FIG. 3 is a side view of a hot water storage tank as a modification of the hot water storage tank according to Embodiment 1. It is a side view of the hot water storage tank of the modification of the hot water storage tank according to Embodiment 1. It is a side view of the hot water storage tank according to Embodiment 2. It is a side view of the hot water storage tank of the modification of the hot water storage tank according to Embodiment 2. FIG. 10 is a side view of a hot water storage tank according to Embodiment 3. It is explanatory drawing of the cross-section of the hot water storage tank of FIG. It is a side view of a hot water storage tank of a modification of the hot water storage tank according to Embodiment 3.

Embodiment 1 FIG.
A hot water supply system according to Embodiment 1 will be described. FIG. 1 is a schematic diagram showing the overall configuration of the hot water supply system according to Embodiment 1. Hot water supply apparatus 100 is connected to hot water supply terminal 30 and hot water supply pipe C, and is connected to general hot water supply terminal 40 and general hot water supply pipe D. The hot water supply pipe C and the general hot water supply pipe D are connected to the hot water supply pipe A of the hot water supply apparatus 100 via the three-way valve 12. The hot water supply terminal 30 is connected to a bathtub 31. The general hot water supply terminal 40 is, for example, a faucet or a shower head installed in a cooking place, a bathroom, or the like.

  Hot water supply device 100 includes hot water storage tank 10. The hot water storage tank 10 has hot water outlets at its upper, middle, and lower portions, and is connected to an upper outlet pipe 51, a middle outlet pipe 52, and a lower outlet pipe 53, respectively. The upper outlet pipe 51, the middle outlet pipe 52, and the lower outlet pipe 53 are connected to the mixing valve 11, and can mix hot and cold water from the respective pipes. The mixing valve 11 is connected to the hot water supply pipe A, and hot water is supplied from the mixing valve 11 to the hot water supply pipe A.

  Hot water supply device 100 includes heat pump unit 20, and hot water storage tank 10 is connected to heat pump unit 20 by piping B for heating. The heating pipe B is connected so as to reach from the lower part of the hot water storage tank 10 to the upper part of the hot water storage tank 10 via the heating pump 21 and the heat pump unit 20.

  Hot water supply device 100 includes a control device 60 that controls the entire operation of hot water supply device 100, and a remote controller 70 that transmits a user's instruction to control device 60. The remote controller 70 and the control device 60 are connected by wireless or wired communication. The upper outlet pipe 51 is provided with an upper temperature sensor 1a, the middle outlet pipe 52 is provided with a middle temperature sensor 1b, and the lower outlet pipe 53 is provided with a lower temperature sensor 1c. Thereby, the temperatures of the hot and cold water in the upper, middle and lower portions of the hot water storage tank 10 are detected.

(Hot water storage tank 10)
Hot water storage tank 10 has a substantially cylindrical shape, and is made of metal such as stainless steel or resin. The outer side surface of the hot water storage tank 10 is covered with a heat insulating material (not shown). Thereby, the high temperature water in the hot water storage tank 10 can be kept warm for a long time.

  The piping of the water supply end 80 is connected to the lower part of the hot water storage tank 10. Low-temperature water is supplied from the water supply end 80 into the hot water storage tank 10. In addition, the boiling water pipe B is connected to a lower portion of the hot water storage tank 10, and the hot water storage tank 10 is connected to a heating pump 21 and a heat pump unit 20. By driving the heating pump 21, the hot water in the hot water storage tank 10 is sent to the heat pump unit 20 through the heating pipe B. The hot water that has become hot in the heat pump unit 20 is returned from the heat pump unit 20 to the hot water storage tank 10 through a heating pipe B connecting the upper part of the hot water storage tank 10. As a result, the low-temperature hot water flowing out from the lower portion of the hot water storage tank 10 undergoes heat exchange in the heat exchanger in the heat pump unit 20 to become high-temperature hot water, and is returned to the upper portion of the hot water storage tank 10. In this way, the hot water circulates through the boiling pipe B to form a boiling circuit of the hot water supply apparatus 100.

  In the upper part of the hot water storage tank 10, an upper outlet 81 for feeding the hot water in the upper part of the hot water storage tank 10 to the mixing valve 11 is provided. In the lower part of the hot water storage tank 10, a lower outlet 83 for feeding the lower hot water in the hot water storage tank 10 to the mixing valve 11 is provided. A middle outlet 82 is provided between the upper outlet 81 and the lower outlet 83, and is configured so that hot water in a vertically central portion of the hot water storage tank 10 can be sent to the mixing valve 11. The configuration of the central outlet 82 will be described later in detail.

(Heat pump unit 20)
The heat pump unit 20 is a heat pump using, for example, CO ₂ or HFC (hydrofluorocarbon) as a refrigerant. The heat pump unit 20 includes a compressor, a first heat exchanger that performs heat exchange between refrigerant and water, an expansion valve, a second heat exchanger that performs heat exchange between outside air and the refrigerant, a blower, and a temperature. It is composed of a sensor, a control board, and the like. The compressor, the heat exchanger, the expansion valve, and the second heat exchanger are connected in a ring by a refrigerant pipe to form a refrigeration cycle circuit.

(About hot water supply control)
FIG. 2 is a control block diagram of hot water supply apparatus 100 according to Embodiment 1. The control device 60 receives an operation instruction from the remote controller 70, a request from the hot water supply terminal 30, a request from the general hot water terminal 40, and a value detected by the sensors 1 a to 1 d and the flow rate sensor 2 a installed in the hot water supply device 100. Based on this, the heat pump unit 20, the mixing valve 11, the three-way valve 12, and the boiling pump 21 are controlled.

(About the use of medium-temperature water)
3 to 5 are explanatory diagrams of the temperature distribution in hot water storage tank 10 of hot water supply device 100 according to Embodiment 1. FIG. 3 to 5, the vertical axis indicates the vertical position of the hot water storage tank 10, and the horizontal axis indicates the temperature of hot water at the vertical position in the hot water storage tank 10. Hereinafter, the effect of using the medium-temperature water in the hot water storage tank 10 will be described with reference to FIGS. FIG. 3 shows a temperature distribution of hot water in hot water storage tank 10 after completion of boiling. When hot water supply device 100 performs a boiling operation, control device 60 drives boiling pump 21 and sends low-temperature water at the lower portion of hot water storage tank 10 to heat pump unit 20. The low temperature water sent to the heat pump unit 20 becomes high temperature water and returns to the upper part of the hot water storage tank 10. Therefore, as shown in FIG. 3, high-temperature water is stored in the upper part of the hot-water storage tank 10, and after the boiling is completed, high-temperature water is distributed in the upper part of the hot-water storage tank 10, and low-temperature water is stored in the lower part of the hot-water storage tank 10. It becomes a distributed state.

  Immediately after boiling, high-temperature water is distributed over a wide area in the upper portion of the hot-water storage tank 10, and low-temperature water is distributed on a part of the lower portion of the hot-water storage tank 10. Immediately after the boiling, the boundary layer A1 between the low-temperature water and the high-temperature water is at the lower part of the hot-water storage tank 10, and the boundary layer A1 is formed in a narrow region in the vertical direction of the hot-water storage tank 10. That is, the temperature distribution is such that the temperature of the hot water in the hot water storage tank 10 changes rapidly in the boundary layer A1.

  FIG. 4 shows a temperature distribution in hot water storage tank 10 immediately before boiling when hot water is supplied to at least one of hot water supply terminal 30 and general hot water supply terminal 40 from upper outlet 81 and lower outlet 83 of hot water storage tank 10. Is shown. In the following description, hot water supply terminal 30 and general hot water terminal 40 may be collectively referred to as a hot water supply terminal. FIG. 4 shows the temperature distribution of hot water storage tank 10 when hot water is not discharged from central outlet 82 arranged at the center in the vertical direction of hot water storage tank 10. That is, the temperature distribution in the hot water storage tank 10 after the relatively hot water from the upper outlet 81 and the relatively cold water from the lower outlet 83 are mixed and supplied to the hot water supply terminal.

  Hot water and low-temperature water in the hot-water storage tank 10 are simultaneously discharged from the hot-water storage tank 10 by mixing hot and cold water in the upper part and the lower part of the hot-water storage tank 10, and the normal-temperature water is supplied from the lower water supply end. Is supplied. Thereby, high-temperature water and low-temperature water are mixed in the middle part of the hot-water storage tank 10, and the boundary layer A2 is expanded. That is, the hot water at the upper part of the hot water storage tank 10 shown in FIG. Also, the temperature T2 of the uppermost hot water in the hot water storage tank 10 becomes lower than the temperature T1 of the uppermost hot water shown in FIG. The temperature of the hot water in the upper part of the hot water storage tank 10 is such that the hottest water with the highest temperature at the top is removed and mixed with the low-temperature water in the lower part, and normal temperature water is supplied from the water supply end 80 in the lower part of the hot water storage tank 10, The distribution is such that the temperature gradually decreases as going down the hot water storage tank 10. As a result, medium-temperature water is generated in the hot water storage tank 10.

  In the temperature distribution of hot water storage tank 10 shown in FIG. 4, when hot water supply device 100 shifts to the boiling operation, low-temperature water flows into heat pump unit 20 from the lower portion of hot water storage tank 10 immediately after the start of the boiling operation. However, the temperature of the hot and cold water flowing into the heat pump unit 20 gradually increases.

  FIG. 5 shows a temperature distribution in hot water storage tank 10 immediately before boiling when hot water is supplied to a hot water supply terminal from a central outlet 82 provided in hot water storage tank 10. Immediately after the boiling as shown in FIG. 3, when hot water is supplied to the mixing valve 11 from the central outlet 82, the hot water from the central outlet 82 is also at substantially the same temperature as the hot water above the hot water storage tank 10. . Therefore, when supplying hot water to the hot water supply terminal, hot water from both the central outlet port 82 and the lower outlet port 83 is often mixed and supplied by the mixing valve 11. Alternatively, hot water is supplied only from the central outlet 82. Accordingly, hot and cold water is discharged from the middle and lower portions of the hot water storage tank 10, and normal temperature water is supplied from the water supply end 80 into the hot water storage tank 10.

  When the middle and lower portions of the hot water in the hot water storage tank 10 are discharged and water is supplied from the lower water supply end 80, the lower temperature water region in the lower portion of FIG. On the other hand, the high temperature water in the upper part of the hot water storage tank 10 is not discharged from the hot water storage tank 10, so that the upper part of the hot water storage tank 10 is maintained at a relatively high temperature. As described above, when hot water is supplied from the middle outlet 82 to the hot water supply terminal, a boundary layer A3 between high-temperature water and low-temperature water is formed in a narrow vertical area of the hot-water storage tank 10. In addition, the boundary layer A3 in FIG. 5 is located at an upper part in the hot water storage tank 10 than the state shown in FIG. Thereby, when hot water is supplied from the central outlet 82 shown in FIG. 5, the proportion of low-temperature water in the hot water flowing into the heat pump unit 20 at the time of boiling is increased.

(Refrigeration cycle efficiency at boiling)
FIG. 6 is an explanatory diagram showing changes in refrigerant pressure and enthalpy of heat pump unit 20 at the time of boiling in hot water supply apparatus 100 according to Embodiment 1. That is, FIG. 6 shows a Mollier diagram of the refrigerant in the refrigeration cycle circuit of the heat pump unit 20. In the heat pump unit 20, a compressor, a first heat exchanger, an expansion valve, and a second heat exchanger are annularly connected by a refrigerant pipe to form a refrigeration cycle circuit. Hot water at the lower part of the hot water storage tank 10 is supplied to the heat pump unit 20 from the heating pipe B connected to the lower part of the hot water storage tank 10. Hot water from the hot water storage tank 10 exchanges heat with a refrigerant in a first heat exchanger in the heat pump unit 20 and is heated to high-temperature water.

  In the Mollier diagram of FIG. 6, a point P is a point indicating a state in which the refrigerant that has passed through the second heat exchanger and evaporated has been sucked into the compressor. Point Q is a point indicating a state where the refrigerant is compressed by the compressor and discharged from the compressor. Point R is a point indicating a state in which the refrigerant exchanges heat with hot water from hot water storage tank 10 and condenses in the first heat exchanger. Point S is a point indicating a state where the refrigerant is expanded through the expansion valve and flows into the second heat exchanger. That is, in the hot water supply apparatus 100, the heat exchange between the refrigerant and the hot water when the hot water is boiled by the heat pump unit 20 corresponds to the change from the point Q to the point R in FIG. Here, the work of the compressor of the refrigeration cycle circuit can be represented by the enthalpy difference h between the point P and the point Q. Therefore, in order to increase the ability to heat hot and cold water for the work of the compressor, the enthalpy difference h1 between the point Q and the point R may be increased. That is, the enthalpy difference h1 between the point Q and the point R increases as the point R moves to the left side in FIG. 6, so that the COP value of the refrigeration cycle circuit increases. Here, the COP value is represented by (h + h1) / h.

  However, the point at which the point R can be reached is limited by the temperature of the fluid that exchanges heat with the refrigerant flowing through the refrigeration cycle circuit of the heat pump unit 20. That is, the lower the temperature of the fluid in which heat exchange is performed with the refrigerant, the smaller the enthalpy is, so the enthalpy difference h1 increases and the COP value increases. In the first embodiment, as the temperature of hot water sent from hot water storage tank 10 is lower, the enthalpy is smaller, so that the efficiency of the refrigeration cycle circuit is improved.

  In FIG. 6, the temperature of the refrigerant at the point R when the hot and cold water having the temperature Ta shown in FIGS. At this time, since the hot and cold water in the hot water storage tank 10 is being sent to the heat pump unit 20, the enthalpy difference h1 is the largest and the COP value is also the largest. However, when the temperature distribution in hot water storage tank 10 is in the state shown in FIG. 4, the temperature of hot water sent to heat pump unit 20 tends to be higher than in the state in hot water storage tank 10 shown in FIG. 5. That is, since hot water having a temperature higher than Ta is supplied to the heat pump unit 20, the point R shown in FIG. 6 gradually moves toward the point R1. Therefore, the efficiency of the refrigeration cycle circuit of the heat pump unit 20 decreases.

  As shown in FIG. 4, when hot water supply apparatus 100 supplies hot water to the hot water supply terminal only from upper outlet 81 and lower outlet 83 of hot water storage tank 10, efficiency of heat pump unit 20 tends to decrease. On the other hand, as shown in FIG. 5, when hot water is supplied to the hot water supply terminal using the central outlet 82 of hot water storage tank 10, the efficiency of heat pump unit 20 can be maintained high. That is, the efficiency of the hot water supply apparatus 100 can be improved by performing the hot water supply control using the central outlet port 82.

(About the central outlet 82)
FIG. 7 is a side view of hot water storage tank 10 according to the first embodiment. FIG. 8 is an explanatory diagram of a cross-sectional structure of the hot water storage tank 10 of FIG. FIG. 8 shows a cross section taken along line MM of FIG. The hot water storage tank 10 is a tank having a substantially cylindrical shape in a vertical direction, and is connected to an upper outlet pipe 51 connected to an upper outlet 81 arranged at an upper end and to a lower outlet 83 arranged at a lower end. And a lower take-out pipe 53. A central outlet 82 is provided on a side surface of the hot water storage tank 10, and a central outlet pipe 52 is connected to the central outlet 82. The positions of the upper outlet 81, the middle outlet 82, and the lower outlet 83 are not limited to those shown in FIG. For example, the upper outlet 81 and the lower outlet 83 may be provided in any part of the end plates 15a and 15b of the hot water storage tank 10 having a hemispherical shape. Also, the middle outlet 82 may be provided above or below the illustration as long as it is the center of the hot water storage tank 10 in the vertical direction.

  Further, in addition to the lower outlet 83, a heating pipe B connected to the heat pump unit 20 and a water supply end 80 for supplying room temperature water to the hot water storage tank 10 are connected to a lower portion of the hot water storage tank 10. It is omitted in FIG.

  The central outlet 82 is provided on the side surface of the hot water storage tank 10, and is formed as a circular opening at one location on the side surface of the hot water storage tank 10 in the first embodiment. The central outlet port 82 is connected to the central outlet pipe 52. In the first embodiment, the middle outlet 82 is an opening provided on the side surface of the hot water storage tank 10, and the hot water in the hot water storage tank 10 is obtained from the opening. The opening at the tip of the pipe inserted into the opening may be used. When it is desired to obtain hot water near the center of the hot water storage tank 10, a pipe can be inserted from an opening provided on the side surface of the hot water storage tank 10 and hot water can be obtained from the tip of the pipe. In this case, the central outlet 82 is at the tip of the pipe.

  As the amount of hot water supplied to the hot water supply terminal from the central outlet 82 increases, the COP value of the heat pump unit 20 at the time of boiling increases. However, the amount of hot water discharged from the hot water supply terminal needs to be at least the same or higher, regardless of whether or not hot water is supplied from the central outlet 82. In other words, when hot water is obtained from the upper outlet 81 and the lower outlet 83 and high-temperature water and low-temperature water are mixed by the mixing valve 11 and hot water is supplied to the hot water terminal, the hot water terminal is supplied only from the central outlet 82. When supplying hot and cold water, the amount of hot water discharged from the hot water supply terminal must be equal to or more than the same. If the amount of hot water discharged from the hot water supply terminal is equal to or more than the same, the hot water filling time can be made approximately the same as in the past.

  If the hot water storage tank 10 is not provided with the central outlet 82, the hot water in the upper part of the hot water storage tank 10 and the low-temperature water in the lower part of the hot water storage tank 10 are mixed and discharged. At this time, assuming that the flow rate of the high-temperature water supplied from the upper outlet 81 is Va and the flow rate of the low-temperature water supplied from the lower outlet 83 is Vc, the amount of hot water discharged from the hot water supply terminal is Va + Vc. On the other hand, assuming that the flow rate of the middle-temperature water supplied from the middle outlet 82 is Vb, when the middle-temperature water from the middle outlet 82 and the low-temperature water from the lower outlet 83 are mixed to supply hot water to the hot water supply terminal, The amount of hot water from the hot water supply terminal is Vb + Vc. In the first embodiment, when mixing the middle-temperature water from the middle outlet 82 and the low-temperature water from the lower outlet 83 to supply hot water at a predetermined temperature to the hot water supply terminal, the high temperature supplied from the upper outlet 81 Since the temperature of medium-temperature water is lower than that of water, Vb> Va must be satisfied if the amount of hot water discharged from the hot water supply terminal is constant. For this reason, the cross-sectional area Am of the middle outlet 82 is set to be larger than the cross-sectional area At of the upper outlet 81. By making the cross-sectional area Am of the central outlet 82 larger than the cross-sectional area At of the upper outlet 81, when hot water is supplied using the central outlet 82, pressure loss when hot water flows out of the hot water storage tank 10 is reduced. It is possible to suppress the decrease in flow rate at the hot water supply terminal.

(Vacuum insulation 90)
FIG. 9 is an explanatory diagram of the structure of the vacuum heat insulating material 90 shown in FIG. 7 and FIG. FIG. 9A is a plan view of the vacuum heat insulating material 90 before being attached to the hot water storage tank 10. FIG. 9B is an explanatory view of the structure taken along the line NN of FIG. 9A. The characteristics of the vacuum heat insulating material (VIP) will be described with reference to FIG. The vacuum insulation panel (Vacuum Insulation Panel: VIP) is formed by evacuating the inside of a bag-like sheet enclosing a core material. As a conventional heat insulating material, there is a bead method polystyrene foam (Expanded Poly-Styrene: EPS), but the thermal conductivity (W / m · K) of EPS is generally about 0.0340 to 0.040. On the other hand, the thermal conductivity of the vacuum heat insulating material 90 is about 0.002, and the vacuum heat insulating material 90 has high heat insulating performance. Moreover, since the vacuum heat insulating material 90 can be formed thin, when it is installed along the side surface of the hot water storage tank 10, the installation area of the hot water storage tank 10 can be reduced. Thereby, the water heater 100 can be easily applied to various houses by reducing the installation area. Therefore, using a vacuum heat insulating material for heat insulation of the hot water storage tank 10 has a great effect in reducing the installation area of the hot water storage tank 10.

  As shown in FIG. 9B, the end portion of the vacuum heat insulating material 90 does not have a core material sealed therein, and the coating material 93 b covering the end portion of the vacuum heat insulating material 90 is provided on one surface of the vacuum heat insulating material 90. Is connected to the covering material 93c on the other surface. Therefore, the end portion of the vacuum heat insulating material 90 has no effect of improving the heat insulating performance due to the inside being evacuated. As a result, in the vacuum heat insulating material 90, heat leakage occurs in the path from the coating material 93a on one surface to the coating material 93b on the end surface and the coating material 93c on the other surface. When the vacuum heat insulating material 90 is applied to the side surface of the hot water storage tank 10, the covering material 93 a on one surface is installed so as to face the side surface of the hot water storage tank 10. With respect to the surface area of the hot water storage tank 10 covered by the vacuum heat insulating material 90, the length of the end of the vacuum heat insulating material 90, that is, the peripheral length of the vacuum heat insulating material 90 in FIG. Therefore, when applied to the side surface of hot water storage tank 10 as shown in the first embodiment, it is preferable that the number of vacuum heat insulating materials 90 is reduced and the vacuum heat insulating material 90 has a flat shape without unevenness at the end.

(Installation of vacuum insulation material 90)
As shown in FIG. 7, the shape of the hot water storage tank 10 is formed so that the tank height is larger than the tank diameter in order to reduce the installation area. Therefore, when the rectangular flat-plate-shaped vacuum heat insulating material 90 is installed so as to be wound around the side surface of the hot water storage tank 10, the long side of the vacuum heat insulating material 90 is arranged along the vertical direction of the hot water storage tank 10. Since the hot water storage tank 10 has the central outlet 82 provided on the side surface, the central outlet 82 is sandwiched between the long sides 95 of the vacuum heat insulating material 90 as shown in FIG. The long side 95 of the vacuum heat insulating material 90 is arranged as close as possible to the middle outlet 82, and is arranged along the axial direction of the hot water storage tank 10. By arranging the vacuum heat insulating material 90 in this way, the surface area of the side surface of the hot water storage tank 10 covered by the vacuum heat insulating material 90 can be maximized.

  As shown in FIG. 8, the side surface of hot water storage tank 10 according to Embodiment 1 is covered with two vacuum heat insulating materials 90a and 90b. The vacuum heat insulating materials 90a and 90b are respectively installed on the side surface 16 of the hot water storage tank 10 along the covering material 93a on one surface. The vacuum heat insulating materials 90a and 90b are arranged so that the long sides 95 are opposed to each other on the side where the middle outlet 82 is arranged and on the side opposite to the middle outlet 82 across the center of the hot water storage tank 10. .

  In addition, the vacuum heat insulating material 90 that covers the side surface of the hot water storage tank 10 may be configured by one integrated vacuum heat insulating material 90. That is, the vacuum heat insulating material 90 may be formed such that two vacuum heat insulating materials 90a and 90b divided in the circumferential direction are integrated as shown in FIG. In this case, the peripheral length of the vacuum heat insulating material 90 is shorter than the area of the side surface of the hot water storage tank 10 covered by the vacuum heat insulating material 90, which is advantageous for heat leakage. However, when the integrated vacuum heat insulating material 90 is applied to the side surface of the hot water storage tank 10, for example, it is necessary to attach the C-shaped vacuum heat insulating material 90 in the cross section shown in FIG. is there. In this case, attachment of the vacuum heat insulating material 90 becomes difficult.

  On the other hand, as shown in FIG. 8, by covering the side surface 16 of the hot water storage tank 10 with two vacuum heat insulating materials 90a and 90b, when attaching the vacuum heat insulating materials 90a and 90b to the hot water storage tank 10, the vacuum heat insulating materials 90a and 90b 90b can be attached from the side of the hot water storage tank 10, so that the attachment work is facilitated, and the breakage of the core material 92 of the vacuum heat insulating materials 90a, 90b during the attachment work can be suppressed. In addition, the vacuum heat insulating materials 90a and 90b divided and arranged in the circumferential direction on the side surface of the hot water storage tank 10 may be referred to as heat insulating members.

  The vacuum heat insulating materials 90a, 90b are formed by joining a covering material 93a covering one surface and a covering material 93c covering the other surface, and the joint 96 projects around the vacuum heat insulating materials 90a, 90b. It is provided to be. When the vacuum heat insulators 90a and 90b are installed in the hot water storage tank 10, the joint 96 is folded inward so as not to protrude from the periphery of the vacuum heat insulators 90a and 90b. Therefore, in FIGS. 7 and 8, the joint 96 is not shown. In the first embodiment, the vacuum heat insulating materials 90a and 90b are formed in a simple rectangular shape, and the folding of the joint 96 projecting from the end can be easily performed. That is, since the long sides 95 of the vacuum heat insulating materials 90a and 90b have no unevenness, the joint 96 can be folded back. Therefore, when installed in the hot water storage tank 10, the joining portion 96 is arranged at a portion where the long sides 95 of the vacuum heat insulating materials 90 a and 90 b face each other, and at a portion where the long side 95 and the middle outlet 82 are close to each other. The vacuum heat insulating materials 90a and 90b can be installed without providing a space. Eventually, since the area of the side surface of the hot water storage tank 10 covered by the vacuum heat insulating materials 90a and 90b increases, there is an advantage that the heat retention of the hot water storage tank 10 is enhanced.

  For example, when the long sides 95 of the vacuum heat insulating materials 90a and 90b are formed in a complicated uneven shape, not only the perimeter becomes long, but also the shape of the joining portion 96 becomes complicated and it becomes impossible to fold. As a result, the area of the side surface of the hot water storage tank 10 covered by the vacuum heat insulating materials 90a and 90b becomes small. Therefore, it is desirable that the vacuum heat insulating material 90 be formed by a simple rectangle like the vacuum heat insulating materials 90a and 90b described in the first embodiment. In the case where the central outlet 82 is provided as in the hot water storage tank 10, the shape of the long side 95 of the vacuum heat insulating material 90 is not adjusted to the central outlet 82, but the long side 95 is By being formed linearly along the direction, the area of the side surface of the hot water storage tank 10 to be covered can be increased.

  FIG. 10 is a side view of hot water storage tank 10a as a modified example of hot water storage tank 10 according to Embodiment 1. In the hot water storage tank 10a, the shape of the central outlet 82a is formed in an elliptical shape that is long in the vertical direction. The structure of the cross section at the center of hot water storage tank 10a is the same as that in FIG. Since the central outlet 82a is formed in an elliptical shape that is long in the vertical direction of the hot water storage tank 10a, the central outlet 82a reduces the horizontal dimension of the hot water storage tank 10a while securing a necessary cross-sectional area. Can be. Therefore, in the hot-water storage tank 10a, the distance w between the long sides 95 of the vacuum heat insulating materials 90a and 90b disposed opposite to each other can be reduced. Therefore, compared with the case where the hot water storage tank 10 is covered with the vacuum heat insulating materials 90a and 90b, the surface area of the side surface of the hot water storage tank 10a covered with the vacuum heat insulating materials 90a and 90b can be made larger.

  In FIG. 10, the central outlet 82a is shown in an elliptical shape, but may be in an elliptical shape having a straight line portion or in a rectangular shape. That is, the same effect is obtained as long as the shape is vertically long in the vertical direction of the hot water storage tank 10a.

  FIG. 11 is a side view of hot water storage tank 10b as a modification of hot water storage tank 10 according to Embodiment 1. The hot water storage tank 10a has a central outlet 82c divided into two parts. Each of the two central outlets 82b is formed to have a smaller area than the central outlet 82 of the hot water storage tank 10. The sum of the areas of the two central outlets 82b is formed to be equal to the area of the central outlet 82. The central outlet 82b is provided in parallel with the vertical direction of the hot water storage tank 10b. Therefore, the interval w between the long sides 95 of the vacuum heat insulating materials 90a and 90b, which are arranged opposite to each other similarly to the hot water storage tank 10a, can be reduced in the hot water storage tank 10b.

  In addition, in FIG. 11, two middle outlets 82 b are formed, but more openings may be provided. The middle outlet pipes 52 connected to the plurality of middle outlets 82b join before the mixing valve 11 after exiting the hot water storage tank 10b. Thus, the amount of hot water supplied from the central outlet 82b to the mixing valve 11 is equivalent to the case where one central outlet 82 is provided.

(Effect of Embodiment 1)
According to the hot water supply apparatus 100 according to Embodiment 1, since the hot water storage tanks 10, 10a, and 10b are provided with the central outlet 82, the efficiency of the heat pump unit 20 can be improved. Further, since the vacuum heat insulating materials 90, 90a, 90b are formed in a simple rectangular shape, the heat radiation from the side surfaces of the hot water storage tanks 10, 10a, 10b can be minimized. Further, by adopting the middle outlets 82a and 82b in the hot water storage tanks 10a and 10b, the surface area of the side surface of the hot water storage tank 10a covered with the vacuum heat insulating materials 90a and 90b can be further increased, so that the heat radiation amount is minimized. , While using the medium-temperature water from the central outlets 82, 82a, 82b, an energy saving effect can be obtained. Furthermore, the vacuum heat insulating material 90 applied to the hot water storage tanks 10, 10a, and 10b can be constituted by one sheet. In this case, the peripheral length of the vacuum heat insulating material 90 is minimized, and the occurrence of a thermal bridge is minimized. Therefore, it is possible to suppress a factor that lowers the heat retention performance.

Embodiment 2. FIG.
Hot water supply apparatus 200 according to the second embodiment is different from hot water supply apparatus 100 according to the first embodiment in the configuration of hot water storage tank 10. In hot water supply apparatus 200 according to Embodiment 2, a description will be given focusing on a change from Embodiment 1. Regarding each unit of hot water supply apparatus 200 according to Embodiment 2, those having the same functions in the drawings are denoted by the same reference numerals as those used in the description of Embodiment 1.

  As shown in FIG. 1, the configuration of a hot water supply system according to Embodiment 2 is the same as that of Embodiment 1. However, the configurations of hot water storage tank 210 and vacuum heat insulating material 290 are different from those of the first embodiment.

  FIG. 12 is a side view of hot water storage tank 210 according to the second embodiment. In the hot water storage tank 210 according to the second embodiment, the vacuum heat insulating material 290a is disposed on the upper side with the middle outlet 282 interposed therebetween and covers the side surface, and the vacuum heat insulating material 290b is disposed on the lower portion and covers the side surface. Both the vacuum heat insulating materials 290a and 290b cover the entire side surface of the hot water storage tank 210. In the hot water storage tank 210, vacuum heat insulating materials 290a and 290b are provided in the upper and lower regions with the middle outlet 282 as a boundary, and the gap H generated in the upper and lower portions is minimized, thereby improving the heat retaining property. The length of the hot water storage tank 210 in the vertical direction is generally longer than the peripheral length. Therefore, in the second embodiment, the area of the side surface of hot water storage tank 210 covered by vacuum heat insulating materials 290a and 290b can be made smaller than in the first embodiment.

  As shown in FIG. 12, the middle outlet 282 is formed in an elliptical shape that is long in the horizontal direction. The middle outlet 282 may be formed in a circular shape, an elliptical shape, or a rectangular shape. This reduces the gap H between the vacuum heat insulating material 290a and the vacuum heat insulating material 290b while securing the necessary cross-sectional area of the central outlet 282, and the side surface of the hot water storage tank 10a covered by the vacuum heat insulating materials 290a and 290b. Can have a larger surface area.

  FIG. 13 is a side view of a hot water storage tank 210a according to a modified example of hot water storage tank 210 according to the second embodiment. The hot water storage tank 210a is provided with a central outlet 282a divided into two parts. Each of the two central outlets 282a has a smaller area than the central outlet 282 of the hot water storage tank 210. The sum of the areas of the two central outlets 282a is formed to be equal to the area of the central outlet 282. The central outlet 282a is provided in parallel with the horizontal direction of the hot water storage tank 210a. Therefore, the interval h between the long sides 95 of the vacuum heat insulating materials 290a and 290b, which are disposed opposite to each other, similarly to the hot water storage tank 210, can also be reduced.

  In addition, in FIG. 13, two middle outlets 282 a are formed, but more openings may be provided. The middle outlet pipes 52 connected to the plurality of middle outlets 282a join before the mixing valve 11 after exiting the hot water storage tank 210a. Thereby, the amount of hot water supplied from the central outlet 282a to the mixing valve 11 is equivalent to the case where one central outlet 282 is provided.

(Effect of Embodiment 2)
According to hot water supply apparatus 200 according to Embodiment 2, it is possible to minimize the amount of heat radiated from the sides of hot water storage tanks 210, 210a from vacuum heat insulating materials 290a, 290b while improving the efficiency of heat pump unit 20. Further, the area covered by vacuum heat insulating materials 290a, 290b can be made larger than in the first embodiment depending on the vertical height of hot water storage tanks 210, 210a and the perimeter of the side surface. Further, the vacuum heat insulating materials 290a and 290b are provided over the entire circumference of the side surface at two locations above and below the hot water storage tanks 210 and 210a. Therefore, it is also possible to install a negative pressure ring for reinforcing the hot water storage tanks 210, 210a in parallel with the vacuum heat insulating materials 290a, 290b.

  The gap H between the vacuum heat insulating materials 290a and 290b is formed at the same height in the vertical direction of the hot water storage tanks 210 and 210a. Therefore, a portion where the gap H is generated is a position where the medium-temperature water is present in the hot water storage tanks 210 and 210a, and no gap between the vacuum heat insulating materials 290a and 290b is generated on the upper side of the hot water storage tanks 210 and 210a in which the high-temperature water is stored. . Therefore, as compared with the hot water supply apparatus 100 according to Embodiment 1, the temperature of the upper high temperature water is easily maintained, and when high temperature water such as reheating is required, the required amount of heat of the hot water supplied to the hot water supply terminal is reduced. The temperature control stability can be improved.

Embodiment 3 FIG.
Hot water supply apparatus 300 according to Embodiment 3 is different from hot water supply apparatus 100 according to Embodiment 1 in the configuration of hot water storage tank 10. In hot water supply apparatus 300 according to Embodiment 3, a description will be given focusing on a change from Embodiment 1. Regarding each part of the hot water supply apparatus 300 according to the third embodiment, those having the same function in each drawing are denoted by the same reference numerals as those used in the description of the first and second embodiments. And

  As shown in FIG. 1, the configuration of a hot water supply system according to Embodiment 2 is the same as that of Embodiment 1. However, the configurations of hot water storage tank 310 and vacuum heat insulating material 390 are different from those of the first embodiment.

  FIG. 14 is a side view of hot water storage tank 310 according to the third embodiment. FIG. 15 is an explanatory diagram of a cross-sectional structure of the hot water storage tank 310 in FIG. The hot water storage tank 310 is entirely covered with a vacuum heat insulating material 390 on the side surface. The central outlet 382 is provided at the tip of a central outlet pipe 352 inserted from above the hot water storage tank 310. That is, the middle outlet pipe 352 is inserted into the inside of the hot water storage tank 310 from the upper end plate 15 a of the hot water storage tank 310. The insertion portion 385 of the middle outlet pipe 352 disposed inside the hot water storage tank 310 passes through a region where high-temperature water exists at the upper portion of the hot water storage tank 310, and a tip thereof is located at a vertically central portion of the hot water storage tank 310. ing. That is, the hot water obtained from the middle outlet 382 is hot water located at the center of the hot water storage tank 310. Therefore, also in hot water supply apparatus 300 according to Embodiment 3, similarly to hot water supply apparatus 100 according to Embodiment 1, hot water from central outlet 382 can be supplied to a hot water supply terminal.

  The middle extraction pipe 352 is provided along the center axis of the substantially cylindrical hot water storage tank 310. Further, an upper extraction pipe 51 for obtaining hot water at the upper part of the hot water storage tank 310 is connected to the end plate 15a on the upper part of the hot water storage tank 310, but the upper extraction pipe 51 and the central extraction pipe 352 are separated as much as possible. It is desirable to be arranged. For example, when hot water is obtained from the upper outlet 81, the hot water near the upper outlet 8 moves, so that when the central outlet 382 is near, the temperature of the hot water obtained from the central outlet 382 also fluctuates. This is because it becomes easy to affect the accuracy of temperature control of hot water supplied to the hot water supply terminal. For example, the middle extraction pipe 352 may be arranged on the opposite side of the upper extraction pipe 351 with respect to the center axis of the hot water storage tank 310.

  In addition, when acquiring hot water from the central outlet 382, hot water having the same temperature as the high-temperature water located at the upper part of the hot water storage tank 310 may come out for a predetermined time after starting to obtain hot water from the central outlet 382. . This is because the hot water inside the insertion portion 385 is heated by the heat of the high-temperature water because the insertion portion 385 passes through the high-temperature water region above the hot water storage tank 310. In this case, for example, the temperature control may be performed on the assumption that the supplied hot water is the same as the high-temperature water located above the hot water storage tank 310 for a predetermined time after the start of obtaining hot water from the central outlet 382. In other words, the temperature detected by the middle temperature sensor 1b after the elapse of a predetermined time from the start of acquiring hot water from the middle outlet 382 is the temperature of the hot water in the center of the hot water storage tank 310.

  FIG. 16 is a side view of a hot water storage tank 310a as a modification of the hot water storage tank 310 according to Embodiment 3. In the hot water storage tank 310a, a middle extraction pipe 352a is inserted into the hot water storage tank 310a from below. The central outlet 382b is provided at the tip of a central outlet pipe 352b inserted from below the hot water storage tank 310a. The insertion portion 385 of the middle outlet pipe 352 disposed inside the hot water storage tank 310 passes through a region where the high-temperature water is present below the hot water storage tank 310a, and the tip is located at the center of the hot water storage tank 310 in the vertical direction. ing.

  The hot water storage tank 310a is provided with a lower outlet port 83 for obtaining lower hot water, and the lower outlet pipe 53 is connected thereto. In the hot water storage tank 310a, the central outlet pipe 352 and the lower outlet pipe 353 are arranged as far apart as possible. It is desirable to be done.

(Effect of Embodiment 3)
According to hot water supply apparatus 300 according to Embodiment 3, since middle outlets 383, 383a are provided on the sides other than the sides of hot water storage tanks 310, 310a, the side surfaces of hot water storage tanks 310, 310a covered by vacuum heat insulating material 390 are provided. The area can be maximized. Therefore, in addition to the effects of the first and second embodiments, it is possible to further suppress the amount of heat radiation from the side surfaces of hot water storage tanks 310 and 310a.

  1a (upper temperature) sensor, 1b (middle temperature) sensor, 1c (lower temperature) sensor, 1d sensor, 2a flow sensor, 8 upper outlet, 10 hot water storage tank, 10a hot water storage tank, 10b hot water storage tank, 11 mixing valve, 12 Three-way valve, 15a end plate, 15b end plate, 16 sides, 20 heat pump unit, 21 heating pump, 30 hot water supply terminal, 31 bathtub, 40 general hot water supply terminal, 51 upper extraction pipe, 52 middle extraction pipe, 53 lower extraction pipe , 60 control device, 70 remote controller, 80 water supply end, 81 upper outlet, 82 central outlet, 82a central outlet, 82b central outlet, 82c central outlet, 83 lower outlet, 90 vacuum insulation, 90a vacuum Insulation, 90b vacuum insulation, 2 core material, 93a covering material, 93b covering material, 93c covering material, 95 long sides, 96 joints, 100 hot water supply device, 200 hot water supply device, 210 hot water storage tank, 210a hot water storage tank, 282 middle outlet, 282a middle outlet, 290 Vacuum insulation material, 290a Vacuum insulation material, 290b Vacuum insulation material, 300 hot water supply device, 310 hot water storage tank, 310a hot water storage tank, 351 Upper take-out piping, 352 Middle take-out piping, 352a Middle take-out piping, 352b Middle take-out piping, 353 Lower take-out Piping, 382 central outlet, 382b central outlet, 383 central outlet, 383a central outlet, 385 insert, 390 vacuum insulation, A hot water supply piping, A1 boundary layer, A2 boundary layer, A3 boundary layer, Am cross-sectional area , At cross section , B boiling pipe, C hot water filling hot water supply pipe, D generally hot water supply pipe, H clearance, T1 temperature, T2 the temperature, Ta temperature, h enthalpy difference, h1 enthalpy difference.

Claims (16)

A hot water storage tank that allows heated hot water to flow in and store it inside,
A heat pump for heating the hot water taken out of the hot water storage tank,
An upper outlet for taking out hot water from the upper part of the hot water storage tank,
A lower outlet for taking out hot water from the lower part of the hot water storage tank,
In the vertical direction of the hot water storage tank, a middle outlet that is provided between the upper outlet and the lower outlet and that takes out hot water from the center of the hot water tank.
A mixing valve for mixing the hot water from the upper outlet, the lower outlet, and the middle outlet;
A hot water supply terminal connected to the mixing valve and supplied with mixed hot and cold water,
The central outlet is
A hot water supply device formed on a side surface of the hot water storage tank, wherein a vertical dimension is larger than a horizontal dimension. A heat insulating material covering the side surface of the hot water storage tank,
The thermal insulation,
The ends are arranged so as to oppose each other with the middle outlet opening interposed therebetween,
The end,
The hot water supply device according to claim 1, wherein the hot water supply device is formed linearly over the hot water storage tank in a vertical direction. The central outlet is
Formed from a plurality of openings,
The plurality of openings,
It is parallel to the vertical direction of the hot water storage tank,
The middle extraction pipe connected to each of the plurality of openings,
The hot-water supply device according to claim 1, wherein the hot-water supply device joins before being connected to the mixing valve. A hot water storage tank that allows heated hot water to flow in and store it inside,
A heat pump for heating the hot water taken out of the hot water storage tank,
An upper outlet for taking out hot water from the upper part of the hot water storage tank,
A lower outlet for taking out hot water from the lower part of the hot water storage tank,
In the vertical direction of the hot water storage tank, a middle outlet that is provided between the upper outlet and the lower outlet and that takes out hot water from the center of the hot water tank.
A mixing valve for mixing the hot water from the upper outlet, the lower outlet, and the middle outlet;
A hot water supply terminal connected to the mixing valve and supplied with mixed hot and cold water,
The central outlet is
A hot water supply device formed on a side surface of the hot water storage tank and having a horizontal dimension larger than a vertical dimension. A heat insulating material covering the side surface of the hot water storage tank,
The thermal insulation,
The ends are arranged so as to oppose each other with the middle outlet opening interposed therebetween,
The end,
The hot water supply device according to claim 4, wherein the hot water storage device is formed linearly in a horizontal direction of the hot water storage tank. The central outlet is
Divided into multiple openings,
The plurality of openings,
The hot water supply apparatus according to claim 4, wherein the hot water storage tanks are arranged in parallel in a horizontal direction. A hot water storage tank that allows heated hot water to flow in and store it inside,
A heat pump for heating the hot water taken out of the hot water storage tank,
An upper outlet for taking out hot water from the upper part of the hot water storage tank,
A lower outlet for taking out hot water from the lower part of the hot water storage tank,
In the vertical direction of the hot water storage tank, a middle outlet that is provided between the upper outlet and the lower outlet and that takes out hot water from the center of the hot water tank.
A mixing valve for mixing the hot water from the upper outlet, the lower outlet, and the middle outlet;
A hot water supply terminal connected to the mixing valve and supplied with mixed hot and cold water,
The central outlet is
A hot water supply device formed at a distal end of a central outlet pipe inserted into the hot water storage tank from a direction along a central axis of the hot water storage tank. A hot water storage tank that allows heated hot water to flow in and store it inside,
A heat pump for heating the hot water taken out of the hot water storage tank,
An upper outlet for taking out hot water from the upper part of the hot water storage tank,
A lower outlet for taking out hot water from the lower part of the hot water storage tank,
In the vertical direction of the hot water storage tank, a middle outlet that is provided between the upper outlet and the lower outlet and that takes out hot water from the center of the hot water tank.
A mixing valve for mixing the hot water from the upper outlet, the lower outlet, and the middle outlet;
A hot water supply terminal connected to the mixing valve and supplied with mixed hot and cold water,
The central outlet is
A hot-water supply device formed at a tip of a middle extraction pipe inserted into the hot-water storage tank from above or below the hot-water storage tank.   The hot water supply apparatus according to claim 7, further comprising a heat insulating material that covers a side surface of the hot water storage tank over the entire circumference. The thermal insulation,
It is divided into a plurality of heat insulating members in the circumferential direction of the side surface of the hot water storage tank,
The plurality of heat insulating members,
The hot water supply apparatus according to claim 9, wherein the hot water supply apparatuses are arranged with a gap therebetween. The middle take-out pipe,
The hot water supply device according to any one of claims 7 to 10, wherein the hot water storage device is inserted downward from an upper portion of the hot water storage tank. An upper outlet pipe connected to the upper outlet is provided,
The middle take-out pipe,
The hot water supply apparatus according to claim 11, wherein the hot water supply apparatus is disposed on a side opposite to the upper extraction pipe with respect to a center axis of the hot water storage tank.   The hot water supply device according to any one of claims 7 to 10, wherein the hot water supply device is inserted upward from a lower portion of the hot water storage tank. Comprising a lower outlet pipe connected to the upper outlet,
The middle take-out pipe,
The hot water supply apparatus according to claim 13, wherein the hot water supply apparatus is disposed on a side opposite to the lower outlet pipe with respect to a center axis of the hot water storage tank. A control device for controlling the heat pump and the mixing valve,
A middle temperature sensor for measuring the temperature of the middle extraction pipe,
The controller is
Open the mixing valve so as to obtain hot and cold water from the middle outlet pipe, the temperature measured by the middle temperature sensor after a lapse of a predetermined time as the temperature of hot water in the center of the hot water storage tank, from the upper outlet The hot water supply apparatus according to any one of claims 7 to 14, wherein the hot water and the hot water from the lower outlet control the amount of hot water flowing into the mixing valve. The cross-sectional area of the central outlet is
The hot-water supply device according to any one of claims 1 to 15, wherein the hot-water supply device has a sectional area equal to or larger than a cross-sectional area of the upper outlet.

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