JP2005265319A - Storage type hot water supplying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type hot water supplying device equipped with a high degree of utility and allowing a discharge of cold water and also water supply at a temperature equal to or below the cold water discharged. <P>SOLUTION: The storage type hot water supplying device to discharge the cold in order for a supply water heating device 2 to boil the supply water is furnished with a cold water storage tank 5 to receive the supply water Wf and configured so that part of a cold water circulating circuit 55 in which the water in the tank 5 is sucked out from a suction hole 53 and returned again to the tank 5 from a return hole 54, is fed to a heat-exchanger for cooling to make heat exchange with the cold discharged by the supply water heating device 2, and the water sucked out from the suction hole 53 is cooled and returned to the tank 5 from the return hole 54. Cold water discharge piping 65 is provided to discharge the cold water returned from the return hole 54 and stored in the tank 5. At the outlet from the cold water discharge piping 65, a cold water discharge port 73 is provided to allow a person to use the cold water. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot water supply hot water supply device that operates a water supply heating device such as a heat pump unit by electric power, heats the water supply until a target heat storage amount commanded by a control device is reached, and stores it in a hot water storage tank. The present invention relates to a hot water storage type hot water supply apparatus that effectively uses cold heat released from the outside.

  2. Description of the Related Art Conventionally, there is a hot water storage type hot water supply device that stores high temperature hot water heated by an electric power operated heat pump unit in a hot water storage tank. In particular, as this type of hot water supply device, the lowest water in the hot water storage tank is heated by a heat pump unit and sent as hot hot water to the uppermost part in the hot water storage tank. It is known that hot water is stored in the upper side of the tank so as not to mix with the water in the lower side of the hot water storage tank. When the hot water in the hot water storage tank is output (for example, the tap is opened and the hot water is consumed outside the hot water storage tank), hot water is supplied from the hot water outlet pipe connected to the uppermost part of the hot water storage tank. Water is supplied into the hot water storage tank from the connected water supply pipe.

  Such a hot water storage type hot water supply device also generally has a function as a heating heat source. For example, high-temperature hot water in a hot water storage tank is circulated outside the hot water storage tank, and used as a heat source for floor heating, bathroom heating, indoor fan heating, etc. After use, it is returned to the hot water storage tank again. Naturally, when such heating is performed, the heat stored by the heating is used, that is, the amount of heat stored in the tank is reduced accordingly.

  However, since commercial water is supplied to the feed water heating system, midnight power is used as much as possible, heat is stored in the midnight time zone (currently from 23:00 to 7:00 on the next day), and the daytime is high. In order to avoid heat storage as much as possible during this time period, many are devised to store the amount of heat used on that day in the midnight time period. Naturally, it is necessary to predict the amount of heat to be used the next day after the midnight time period, and conventionally, the amount of heat stored is averaged by the amount of heat used by hot water every day for a certain period, and if necessary, this is slightly The amount of heat used for hot water supply is added by adding this amount, and this is added to the amount of heat used for heating (this is also averaged by the amount of heat used for hot water every day for a certain period, and if necessary, a slight increase is added) The target heat storage amount was set at midnight so that this amount of heat could be stored during the midnight hours.

On the other hand, in order to further utilize the hot water storage type hot water supply apparatus with considerable power consumption in this way, in view of the fact that the feed water heating apparatus must overheat the feed water, cold heat must be discharged to the outside, for example, the following patent As can be seen in Document 1, there have also been attempts to use such cold energy for cooling.
Japanese Patent Laid-Open No. 06-159845

  As described above, there are various types of hot-water storage water heaters that also have a cooling function, in addition to the above-mentioned Patent Document 1, so that the wasteful energy consumption in the water heater can be effectively utilized to some extent. It was preferable. However, no matter what the conventional device configuration is, there is nothing that can supply cold water to the user, and usually the upper limit value (for example, 60 ° C) at 35 ° C or higher and 1 ° C step or several ° C step. Even if it is possible to supply hot water of any temperature set by the user within the range up to the above, by mixing boiling water and cold water, for example, 5 ° C or 10 ° C, etc. There was no one that could supply water at any desired temperature even within the range below the temperature of the water supply (generally tap water). In particular, if water can be supplied at such a temperature in summer, the convenience is extremely high.

  The present invention has been made in view of this point, pursuing further convenience of the hot water storage type hot water supply device, and can store cold water or supply water at any desired temperature below the water temperature at that time. A hot water supply system is to be provided.

In order to achieve the above object, the present invention
The water heater is operated by electric power, the water is boiled and stored in the hot water storage tank until the target heat storage amount commanded by the control device is reached, and the stored hot water is used for hot water or heating by the user. A hot water storage hot water supply device in which the heating device on the other hand releases cold energy to spring water supply;
A cold water storage tank for receiving water supply, and a cold water circulation circuit for sucking out the water in the cold water storage tank from the suction port and returning it to the cold water storage tank from the return port;
A part of this chilled water circulation circuit is passed through a cooling heat exchanger that exchanges heat with the cold heat discharged from the feed water heating device, cooling the water sucked from the suction port and returning it to the cold water storage tank from the return port ;
A cold outlet pipe for discharging cold water in the cold water storage tank returned from the return port;
A hot water storage type hot water supply apparatus is proposed in which a cold water output port through which a user can use cold water is provided at the outlet of the cold water discharge pipe.

  The present invention also satisfies the above basic configuration, and is provided with a mixing valve in the middle of the cold water discharge pipe to mix with the feed water, so that the temperature of the cold water output from the cold water output port is equal to or lower than the temperature of the feed water. A hot water storage type hot water supply device that can be adjusted in the temperature range is also proposed. Of course, the cold water outlet may be provided independently, but the cold outlet pipe may be connected to the hot water outlet stored in the hot water storage tank so that the cold water outlet serves as the outlet. . Of course, it may also have a cooling function. The cooling water storage tank is connected to a cooling circuit that returns from the cooling water storage tank and returns to the cooling water storage tank. It is also possible to provide cooling via this.

  According to the present invention, cold water can be provided to the user as a new function that has not been recognized so far, even as an accessory function of the hot water storage type hot water supply apparatus. This is also a very convenient function in summer. By flowing it thinly, it becomes possible to cool beer cans and watermelons with good atmosphere, or to give cold water to visitors for the time being. It is also suitable to wet the towel when the head is cooled by unexpected heat generation. Furthermore, according to a specific aspect of the present invention, water having a desired temperature can be obtained even in a range below the temperature of the feed water, and this can also be used conveniently. In any case, the present invention provides a new possibility for this type of hot water storage type hot water supply device as an embodiment that effectively uses the cold energy that has been wasted from the electric power supply type hot water supply heating device. .

  FIG. 1 shows a configuration example of a hot water storage type hot water supply apparatus configured by applying the present invention. First of all, starting with a description of the existing configuration, the hot water storage tank 1 is usually made of a metal having excellent corrosion resistance (for example, stainless steel), a heat insulating material (not shown) is arranged on the outer periphery, and the hot water supply water is hot. Can be kept warm for a long time. The hot water storage tank 1 is generally vertically long and has an introduction port 11 on the bottom surface. A water supply pipe 12 for introducing water supply (generally tap water) Wf to the lowermost part of the hot water storage tank 1 is provided in the introduction port 11. It is connected.

  The water supply pipe 12 is provided with a water supply thermistor 31 which is a water supply temperature detecting means, and outputs temperature information in the water supply pipe 12 to the control device 3. In order to supply water to a bypass pipe 15 branched from the introduction pipe 12 and connected to a mixing valve 16 to be described later and a cold water storage tank 5 to be described later downstream from the position where the water supply thermistor 31 of the water supply pipe 12 is provided. The branch pipe 51 is connected.

  A lead-out port 13 is provided at the uppermost part of the hot water storage tank 1, and a lead-out pipe 14, which is a hot water supply path for leading the hot water in the hot water storage tank 1, is connected to the lead-out port 13. The mixing valve 16 provided in the middle of the path can adjust the mixing ratio between the hot water from the outlet pipe 14 and the tap water Wf supplied from the bypass pipe 15 by adjusting the opening area ratio. It has become. In general, the mixing valve 16 is an electric valve that adjusts the opening degree of each path by driving a valve body by a drive source (not shown) such as a servomotor, and is operated by a control signal from the control device 3. The state is also returned to the control device 3.

  The outlet side of the mixing valve 16 is connected to a hot water supply pipe 17 which is a mixed hot water path to a hot water outlet 73 of a faucet, a shower, a bath, etc. A flow rate counter 72 as a means is provided, and the hot water thermistor 71 outputs temperature information in the pipe 17, and the flow rate counter 72 outputs flow information in the pipe 17 to the control device 3. In accordance with one embodiment of the present invention, the outlet of the cold outlet water pipe 65 is also connected to the outlet hot water pipe 17, which will be described later.

  The lower part of the hot water storage tank 1 is provided with a suction port 18 for sucking the lowermost water in the hot water storage tank 1, and the hot water is discharged toward the uppermost part of the hot water storage tank 1 toward the uppermost part of the hot water storage tank 1. A discharge port 19 is provided for this purpose. The suction port 18 and the discharge port 19 are connected by a circulation circuit 30 (for convenience in the present embodiment, this is also referred to as a first circulation circuit 30), and a part of the circulation circuit 30 is controlled by the control device 3. The feed water heater 2 is generally disposed in the heat pump unit 2.

  A heat exchanger 22 for heating as shown in FIG. 2 is provided in the portion of the first circulation circuit 30 disposed in the heat pump unit 2, and the refrigerant that has become hot due to being compressed by the compressor 21, Desirably, the water in the hot water storage tank 1 sucked from the suction port 18 is heated by heat exchange with the carbon dioxide refrigerant, and is returned to the hot water storage tank 1 from the discharge port 19 so as to boil the water in the hot water storage tank 1. It has become. When carbon dioxide is used as the refrigerant of the heat pump unit 2, the refrigerant discharge temperature from the compressor 21 can be increased by using the supercritical region, and hot water can be boiled more efficiently than the case where the refrigerant is used. be able to. The hot water heated by the heat pump unit 2 can be returned to the suction port 18 side as needed via the bypass three-way valve 33.

  A plurality of (six in this embodiment) water level thermistors Th01 to Th06 are arranged on the outer wall surface of the hot water storage tank 1 at substantially equal intervals in the vertical direction (the height direction of the hot water storage tank 1) and are filled in the hot water storage tank 1. The temperature information at each water level is output to the control device 3. Therefore, the control device 3 can detect the boundary position between the hot water heated up in the hot water storage tank 1 and the water before the hot water heated down in the hot water storage tank 1 based on the temperature information from each water level thermistor.

  The water level thermistor Th01 provided on the uppermost outer wall surface of the hot water storage tank 1 is the temperature of the uppermost water in the hot water storage tank 1 that is the temperature of hot water that is output from the outlet 13 and the suction port 41 described later. It also has a tank output hot water temperature thermistor function to detect

  In addition to the above-described suction port 41 at the upper part of the hot water storage tank 1, a discharge port 42 for discharging hot water into the hot water storage tank 1 is provided at the lower part of the hot water storage tank 1, and these suction port 41 and discharge port 42 is connected to a circulation circuit 43 (for convenience, it may be referred to as a second circulation circuit 43 in this embodiment), and a part of this circulation circuit 43 is placed in a heat exchanger 81 as heat exchange means. Has been placed. The heat exchanger 81 is, for example, a counterflow type heat exchanger, and is a heat medium (for example, a heated fluid that flows through a circulation circuit 82 serving as a third circulation circuit described later and high-temperature hot water flowing through the second circulation circuit 43 (for example, It is possible to exchange heat with water.

  A water pump 47 for circulating hot water in the circulation circuit 43 and a thermistor 48 serving as circulating hot water temperature detecting means are provided downstream of the portion of the second circulation circuit 43 where the heat exchanger 81 is provided. The thermistor 48 outputs the temperature information of the hot water after heat exchange by the heat exchanger 81 in the second circulation circuit 43 to the control device 3.

  In the third circulation circuit 82 described above, for example, an external heat release device 83 such as a bathroom heating heat exchanger unit, a floor heating heat exchanger unit, and an indoor fan is provided, and the heat heated by the heat exchanger 81 is provided. Heating can be performed with heating fluid. A water pump 84 for circulating the heat medium in the circulation circuit 82 is also provided in the third circulation circuit 82, and the thermistors 85, 86 is provided, and the temperature information of the heat medium flowing into the heat exchanger 81 and the heat medium flowing out from the heat exchanger 81 in the circulation circuit 82 is output to the control device 3.

  The control device 3 receives information from the outside temperature thermistor 32 which is an outside temperature detecting means provided in the heat pump unit 2 and the like in addition to the tapping flow rate information from each thermistor and the flow counter 72 described so far. The heat pump unit 2, the mixing valve 16, the water pumps 47 and 84, and the like are controlled based on signals from operation switches provided on an operation panel (not shown). Note that an operation panel (not shown) is generally installed in the vicinity of a place where a user uses hot water, such as in a bathroom or kitchen, and the operation panel other than the operation panel is usually installed in an appropriate place such as outdoors.

  When the power switch (not shown) of the hot water supply device is turned on, the control device 3 detects temperature information from each thermistor provided in the hot water storage tank 1, time information set by an operation panel (not shown), etc. Based on the above, the heat pump unit 2 is actuated appropriately to heat the water in the hot water storage tank 1 to a high temperature hot water (for example, 90 ° C. hot water). An external temperature thermistor 32 that detects the temperature of the outside air as described above is also provided at an appropriate location such as the heat pump unit 2, and the above bypass three-way is used to prevent the first circulation circuit 30 from freezing due to a temperature drop. By switching the valve 33 to the suction port 18 side, a pump (not shown) in the heat pump 2 can be driven to perform a freeze prevention operation.

  When various heating switches such as a floor heating switch provided in an operation panel (not shown) are turned on (including a case where the switch is turned on by a heating reservation timer), the control device 3 is connected to the water pump 47, 84 is operated, high-temperature hot water is sucked into the second circulation circuit 43 from the suction port 41 from the uppermost part in the hot water storage tank 1, and the heat medium is circulated in the third circulation circuit 82.

  Thereby, for example, floor heating is performed via the floor heating heat exchanger unit 83 by the heat medium in the third circulation circuit 82 heat-exchanged with the hot water flowing through the second circulation circuit 43 in the heat exchanger 81, etc. Can exhibit a heating function. At this time, the control device 3 uses the water pump 47 so that the heat exchange in the heat exchanger 81 and the floor heating heat exchanger unit 83 is favorably performed based on the temperature information of the water level thermistor 31, the thermistors 48, 85, 86, and the like. , 84 are controlled.

  Further, when the flow rate counter 72 detects the flow of water (hot water) in the hot water piping 17, it means that the user has used hot water through the hot water outlet 73. Therefore, at this time, the control device 3 controls the opening area ratio of the mixing valve 16 based on the temperature information from the feed water thermistor 31, the water level thermistor Th01, and the hot water thermistor 71 according to the set temperature at that time, so that the set temperature is reached. Try to get hot water at a near temperature. That is, when the set temperature is equal to or lower than the detected temperature of the water level thermistor Th01, the control device 3 first sets the mixing valve 16 in the communication state between the bypass pipe 15 and the pipe 17 and shuts off the pipe 14 direction, The ratio of the opening area of the mixing valve 16 is roughly adjusted from the detected temperature of the water supply thermistor 31 and the detected temperature of the water level thermistor Th01, and then the mixing valve is set so that the hot water supply temperature becomes the set temperature based on the temperature information from the hot water thermistor 71 The aperture area ratio of 16 is finely controlled.

  The basic control mode related to the original hot water supply and heating functions of the hot water storage type hot water supply apparatus is as described above, but the following description will be made on the cold water discharge function according to the present invention and, if necessary, the cooling function used together.

  First, there is a cold water storage tank 5 that receives the water supply wf from the discharge port 58 provided in the upper part through the above-described branch pipe 51. It is desirable that the cold water storage tank 5 also has a heat retaining structure. The branch pipe 51 is also provided with an on-off valve 68 that can completely shut off the water passing therethrough when the cold water discharge function is not used at all. The cold water storage tank 5 preferably has a suction port 53 for sucking out water in the tank 5 and preferably a return port 54 at the lower part of the tank. These suction port 53 and the return port 54 are in the fourth circulation. It is connected by a cold water circulation circuit 55 which is a circuit.

  A part of the cold water circulation circuit 55 passes through the heat pump 2 which is a feed water heating device, and the heat generated in the heat pump 2 is transmitted to the water in the cold water circulation circuit 55 according to the present invention. A cooling heat exchanger 24 is provided. In other words, the refrigerant 21 is compressed and heated by the compressor 21 in the refrigerant circulation path 27 and expands the refrigerant such as carbon dioxide that heats the water in the first circulation circuit 30 through the heat exchanger 22 as described above. While the cold heat generated when the valve 23 is expanded is normally simply dissipated into the atmosphere by the fan 26 or the like, in the present invention, the cooling heat exchanger 24 is interposed here, and the cold water storage tank 5 The sucked-out water is cooled and returned to the cold water storage tank 5 from the return port 54.

  The chilled water in the chilled water storage tank 5 returned from the return port 54 is preferably output to the chilled water piping 65 from the discharge port 61 provided at the lower part of the tank 5. The outlet of this cold water pipe 65 is connected to a dedicated cold water outlet as it is, for example, as a normal faucet form, if twisted, cold water may be provided to the user as it is, In this embodiment, the control system may be the same as the mixing valve 16 for hot water supply described earlier for the output cold water and the feed water Wf obtained through the branch pipe 67 that further branches the bypass pipe 15. After the mixing valve 62 that can control the mixing ratio according to 3 can be mixed, the tap 73 for hot water is shared, and this is used as the cold outlet 73. However, it is also possible that the cold outlet is often easier to use.

  The cold water discharge pipe 65 has a cold water discharge thermistor 63 as a cold water temperature sensor that detects the temperature of the cold water discharged around the outlet of the mixing valve 62, and a cold water discharge flow rate that detects the flow rate of the output cold water. A counter (sensor) 64 is provided, and the detected information is given to the control device 3.

  In addition, a plurality of (six in this embodiment) water level thermistors Th11 to Th16 are arranged on the outer wall surface of the cold water storage tank 5 at substantially equal intervals in the vertical direction. The temperature information at is output to the control device 3. Therefore, the control device 3 can detect the boundary position between the cooled water below the inside of the cold water storage tank 5 and the water that has been supplied based on the temperature information from each water level thermistor. In particular, the water level thermistor TH16 provided at the lowermost part of the tank 5 also functions as a sensor for detecting the temperature of the tank output cold water output from the discharge port 61.

  In such a configuration, when the flow counter 64 detects the flow of cold water in the cold outlet water pipe 65, it can be considered that the user has used cold water through the faucet 73. Therefore, at this time, the control device 3 uses the temperature information from the water supply thermistor 31, the water level thermistor Th16, and the cold water thermistor 63 according to the cold water set temperature set in advance by the user via an operation panel (not shown). Based on this, the opening area ratio control of the mixing valve 62 is performed so that cold water having a temperature as close as possible to the set temperature is output. That is, when the set temperature is equal to or higher than the detected temperature of the water level thermistor Th16, the control device 3 first brings the mixing valve 62 into communication with the bypass pipe 67 and the cold outlet 73, and the direction of the cold outlet pipe 65 is changed. Next, the ratio of the opening area of the mixing valve 16 is loosely adjusted from the detected temperature of the feed water thermistor 31 and the detected temperature of the water level thermistor Th16, and then the cold water temperature is set based on the temperature information from the cold water thermistor 63. The opening area ratio of the mixing valve 62 is finely controlled so as to reach the temperature.

  In the present invention, by providing such a mixing valve 62, it is possible to adjust the temperature of the chilled water output from the chilled water output port 73 even in a temperature range equal to or lower than the temperature of the feed water Wf as a function that has not existed until now. Up to now, the temperature adjustment of the hot water is 35 ° C or higher, for example, 1 ° C step or several ° C step, etc. Any temperature output above the temperature of the feed water Wf is possible anyway. There was nothing that could be supplied. As mentioned above, this is a very convenient function and greatly enhances the convenience for the user.

  The hot water storage type hot water supply apparatus of this embodiment can also exhibit a cooling function. In the cold water storage tank 5, the cold water sucked from a suction port 56, which is preferably provided below the cold water storage tank, is returned to the tank 5 through a discharge port 57 which is preferably provided above the cold water storage tank 5. A cooling circuit 58, which is a fifth circuit, is also connected, and a heat exchanger 81 for providing cooling to the outside is provided in the middle of the circuit. In the illustrated embodiment, the heat exchanger 81 is also used as the above-described heat exchanger 81 used for heating, but may of course be a dedicated one. Also in this cooling circuit 58, under the instruction of the control device 3, a water pump 59 for circulating cold water inside, and the cold water in the circulation circuit 58 are detected on the outlet side of the heat exchanger 81 and controlled. A circulating cold water thermistor 66 is provided as a circulating cold water temperature detection sensor for sending detected temperature information to the device 3.

  The heat exchanger 81 is passed through a sixth cooling circuit 82 for cooling, which may be the same circulation circuit as the third circulation circuit 82 for heating, and an internal heat medium (for example, water) circulated by the water pump 84. Can be cooled by exchanging heat with the cold water in the cooling circuit 58.

  Here, when a cooling switch provided in an operation panel (not shown) is turned on (including a case where the switch is turned on by a cooling reservation timer), the control device 3 operates the water pumps 59 and 84 to store hot water. Cold water is circulated in the cooling circuit 58 connected to the tank 5, and the heat medium is circulated in the sixth circulation circuit 82 on the output side of the heat exchanger 81.

  As a result, the sixth circulation circuit 82 provided with cold in the heat exchanger 81 is, for example, an external heat release device that is an appropriate cold heat release means, for example, in the same unit 83 as the floor heating heat exchanger unit 83 described above. If it passes, the floor heating heat exchanger unit 83 works as the floor cooling heat exchanger unit 83 at this time, and it is possible to cool the indoor floor appropriately and comfortably. Of course, both the heat exchanger 81 and the cold heat release means 83 may be devices provided exclusively for cooling. For example, the cold heat release means 83 may be an indoor fan. At this time, the control device 3 performs heat exchange in the heat exchanger 81 and the cold heat release means 83 based on temperature information of the water level thermistor Th16, the thermistor 66, and the thermistors 85 and 86 provided in the sixth circulation circuit. The operation of the water pumps 59 and 84 is controlled so as to be performed well.

  As described in detail above, according to the present invention, cold water at a temperature lower than the feed water temperature can be provided to the user, and the temperature can be controlled, and a cooling function can also be provided. Various modifications can be conceived by those skilled in the art based on the gist of the present invention that exhibits such effects, and modifications thereof are free.

It is a schematic block diagram of one Embodiment of the hot water storage type hot water supply apparatus which concerns on this invention. It is a schematic block diagram inside the heat pump used for one Embodiment of this invention.

Explanation of symbols

1 Hot water storage tank 2 Heat pump unit 3 Control device 5 Cold water storage tank
11 Introduction
12 Water supply piping
13 Outlet
14 Outlet tube
15 Bypass piping
16 Mixing valve
17 Hot spring piping
18 Suction port
19 Discharge port
20 First circuit
21 Compressor
22 Heat exchanger for heating
23 Inflator
24 Heat exchanger for cooling
32 outside temperature thermistor
41 Suction port
42 Discharge port
43 Second circuit
51 Branch pipe 51
52 Discharge port
53 Suction outlet
54 Return port
55 Fourth circuit (Cooling water circuit)
56 Suction port
57 Discharge port 57
58 Fifth circuit (cooling circuit)
61 Discharge port
62 Mixing valve
65 Cold outlet piping
73 Cold water output port
81 heat exchanger
82 Third circuit (sixth circuit)
83 External heat release equipment (cool heat release means)

Claims (4)

The water heating device is operated by electric power, the water is boiled and stored in the hot water storage tank until the target heat storage amount commanded by the control device is reached, and the stored hot water is used for hot water or heating by the user, A hot water storage hot water supply device in which the water heating device releases cold heat to spring the water supply;
A cold water storage tank that receives the water supply, and a cold water circulation circuit that sucks out water in the cold water storage tank from the suction port and returns the water from the return port to the cold water storage tank;
A part of the circulation circuit for the cold water is passed through a cooling heat exchanger that exchanges heat with the cold heat discharged from the feed water heating device, the water sucked out from the suction port is cooled, and the water is sucked out from the return port to the cold water storage tank. As well as to bring it back;
Providing a cold discharge pipe for discharging cold water in the cold water storage tank returned from the return port;
A chilled water output port is provided at the outlet of the chilled water piping to allow the user to use chilled water;
Hot water storage type hot water supply device characterized by The hot water storage type hot water supply apparatus according to claim 1;
A mixing valve is provided in the middle of the cold water supply pipe, and the temperature of the cold water output from the cold water output port is adjusted in a temperature range equal to or lower than the temperature of the water supply by mixing with the water supply;
Hot water storage type hot water supply device characterized by The hot water storage type hot water supply apparatus according to claim 1;
The cold water discharge pipe is connected to a hot water outlet stored in the hot water storage tank, and the cold water output port also serves as the hot water outlet;
Hot water storage type hot water supply device characterized by The hot water storage type hot water supply apparatus according to claim 1;
Also connected to the cold water storage tank is a cooling circuit that exits the cold water storage tank and returns to the cold water storage tank;
A heat exchanger for applying cold to the outside is provided in the middle of the cooling circuit;
Hot water storage type hot water supply device characterized by

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