JP2005300079A - Storage type hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type hot water supply system that can prevent early hot water exhaustion and prevent a reduction in the operating efficiency of heating means by delivering intermediate temperature supply water positively to a hot water supply line. <P>SOLUTION: The storage type hot water supply system has a heating heat exchanger 30 for developing heat exchange between supply water stored in hot water storage tanks 10 and 11 and a secondary fluid, and a hot water supply mixing valve 18 for mixing the supply water flowing into one side and city water flowing into the other side to control the mixture to a preferred outlet water temperature. The hot water supply mixing valve 18 is configured to take in, at the one side, high temperature supply water, intermediate temperature supply water including the supply water subjected to heat exchange in the heating heat exchanger 30, or both of the high temperature and intermediate temperature supply water out of the supply water stored in the hot water storage tanks 10 and 11. This can prevent early hot water exhaustion and prevent a reduction in the operating efficiency of a heat pump unit 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water storage type hot water supply apparatus including a hot water storage tank that stores hot water supply water heated by a heating means, and more particularly to consumption of medium temperature hot water supply water among hot water supply water stored in the hot water storage tank.

  Conventionally, as this type of hot water storage type hot water supply apparatus, a hot water storage tank for storing hot water supply water and a heat pump cycle, heating means for heating by exchanging heat between the high pressure refrigerant and the hot water supply water in the hot water storage tank, Heating water exchanger that heats the hot water stored in the primary side and heats the secondary fluid that flows to the secondary side, and heat exchange between the heated secondary fluid and the heated fluid or heated object There is known a hot water storage type hot water supply apparatus that uses the stored hot water supply water for the purpose of hot water supply, and uses the hot water supply water as a heat source for heating purposes such as floor heating and bathroom heating ( For example, see Patent Document 1.)

Furthermore, a reheating heat exchanger is provided in a hot water storage tank for storing hot water for hot water supply, and a reheating apparatus for retreating the bath water by circulating the bath water in the bathtub through the reheating heat exchanger. There is known a hot water storage type hot water supply apparatus that is used for the purpose of replenishing bath water using the stored hot water supply water for the purpose of hot water supply and using the hot water supply water as a heat source (see, for example, Patent Document 2). .
JP 2003-194347 A Japanese Patent Laid-Open No. 2003-19497

  However, according to Patent Document 1 and Patent Document 2, when heat energy of hot water for hot water stored in a hot water storage tank is exchanged with a heat exchanger for heating or a heat exchanger for reheating, an intermediate temperature (for example, The hot water supply water (about 20 to 45 ° C.) is returned to the hot water storage tank. There is a problem that the hot water supplied at a medium temperature (for example, about 20 to 45 ° C.) returned to the hot water storage tank has a lowered hot water temperature to be used again for the purpose of hot water supply.

  Moreover, when a large amount of hot water for hot water supply (for example, about 20 to 45 ° C.) is stored in the hot water storage tank, the hot water supply water layer moves upward in the hot water storage tank, causing hot water to run out early. There is. By the way, in a hot water storage type hot water supply device that uses midnight power with a low charge for the power supply of the heating means, when the hot water runs out early, the heating means operates in the daytime hours other than midnight hours, and the boiling operation is performed. . This increases the running cost.

  By the way, as a heating means, for example, in a heat pump type heating means comprising a heat pump cycle, when heating hot water to a target temperature (for example, 65 to 90 ° C.), hot water supply having an intermediate temperature (for example, about 20 to 45 ° C.) When a large amount of water is stored in the hot water storage tank, there is a problem that the higher the hot water temperature of the hot water before heating, the higher the high pressure, and the lower the operating efficiency (COP = heating capacity / power consumption).

  Accordingly, an object of the present invention is to take the above-mentioned points into consideration, and by preventing the hot water supply at an intermediate temperature from being actively discharged into the hot water supply path, the hot water can be prevented from running out quickly and the operating efficiency of the heating means can be improved. An object of the present invention is to provide a hot water storage type hot water supply device capable of preventing a decrease.

In order to achieve the above object, the technical means described in claims 1 to 9 are employed. That is, in the first aspect of the present invention, a hot water storage tank (10, 11) that is connected to at least two or more and stores hot water supply water therein and a heat pump cycle includes a high-pressure refrigerant and a hot water storage tank (10, 11) In a hot water storage type hot water supply apparatus provided with a heating means (20) for exchanging heat with hot water for hot water inside,
The hot water stored in the hot water storage tank (10, 11) was stored in the heat exchanger (30, 35) for exchanging heat with the fluid to be heated and the hot water storage tank (10, 11) flowing into one side. First hot water supply temperature adjusting means (18, 18a) for mixing hot water supply water and tap water flowing into the other side to adjust to a desired hot water temperature is provided,
The first hot water supply temperature adjusting means (18, 18a) is a hot water supply water stored in the hot water storage tank (10, 11) or hot water supplied by a heat exchanger (30, 35). It is characterized in that it is configured such that medium temperature hot water supply water containing water or both high temperature and medium temperature hot water supply water flow into one side.

  According to the first aspect of the present invention, the hot water is exchanged with the fluid to be heated by the heat exchanger (30, 35), and the hot water having a medium temperature is kept in the hot water storage tank (10, 11). However, the medium-temperature hot water supply water is actively used for hot water supply by being configured to flow into the one side of the first hot-water supply temperature adjusting means (18, 18a). Can be consumed. As a result, hot water shortage is prevented at an early stage, and low-temperature hot water supply water can be sucked and heated, so that it is possible to prevent a decrease in operating efficiency of the heating means (20) during the boiling operation.

  In the invention according to claim 2, the hot water storage tank (10, 11) is provided with a high temperature extraction pipe (12) for extracting hot water for hot water supply and an intermediate temperature extraction pipe (13) for extracting medium temperature hot water for water supply, The first hot water supply temperature adjusting means (18, 18a) is supplied from a high temperature hot water supply water taken out from the high temperature take-out pipe (12), a medium hot water supply water taken out from the intermediate temperature take-out pipe (13), or a high temperature take-out pipe (12). The hot water supply water to be taken out and the medium temperature hot water supply water to be taken out from the intermediate temperature extraction pipe (13) are both introduced into one side.

  Specifically, according to the second aspect of the present invention, the first hot water supply water having a low hot water temperature, which has been heat-exchanged by the heat exchanger (30, 35), is taken out from the intermediate temperature take-out pipe (13). By being configured to flow into one side of the hot water supply temperature adjusting means (18, 18a), the medium temperature hot water supply water can be actively consumed for the purpose of hot water supply, as in the first aspect. Therefore, premature hot water shortage can be prevented, and a decrease in the operating efficiency of the heating means (20) during the boiling operation can be prevented.

  In the invention described in claim 3, the hot water supply water taken out from the high temperature take-out pipe (12) and the medium temperature hot water supply water taken out from the intermediate temperature take-out pipe (13) are mixed to adjust the hot water temperature to a predetermined temperature. The second hot water supply temperature adjusting means (17) is provided, and the first hot water supply temperature adjusting means (18, 18a) is a hot water supply water whose temperature is adjusted to a predetermined temperature by the second hot water supply temperature adjusting means (17). It is characterized by flowing into the side.

  More specifically, according to the third aspect of the present invention, by providing the second hot water supply temperature adjusting means (17), the medium temperature hot water supply water stored in the hot water storage tanks (10, 11) is positively supplied. Can be easily taken out.

  In the invention according to claim 4, a water temperature sensor (55) for detecting the hot water temperature of the hot water supply water is provided in the vicinity of the upstream end of the intermediate temperature extraction pipe (13), and the second hot water supply temperature adjusting means (17) includes: Based on the temperature information detected by the water temperature sensor (55), the hot water for hot water taken out from the high temperature take-out pipe (12), the hot water for hot water taken out from the medium temperature take-out pipe (13), or the high-temperature take-out pipe (12 ) And hot water supply water taken out from the intermediate temperature extraction pipe (13) are allowed to flow into the primary side of the first hot water supply temperature adjusting means (18, 18a).

  According to the invention described in claim 4, by providing the water temperature sensor (55), it is possible to reliably take out the medium temperature hot water supply water from the hot water supply water stored in the hot water storage tank (10, 11). it can.

  In the invention according to claim 5, the heat exchanger (30, 35) is a reheating heat exchanger for exchanging heat between the hot water stored in the hot water storage tank (10, 11) and the bath water in the bathtub. (30, 35). According to the fifth aspect of the present invention, since the hot-water supply water heat-exchanged by the heat exchanger (30, 35) by reheating the bath water is a hot-water supply water having a medium temperature of about the bath water temperature, It is suitable to be configured to take out water for use in hot water supply. As a result, premature hot water shortage can be prevented, and a decrease in operating efficiency of the heating means (20) during the boiling operation can be prevented.

  In the invention described in claim 6, the reheating heat exchanger (35) is disposed in a portion of the hot water storage tank (10, 11) where hot water for hot water supply is stored, and the hot water storage tank (10, 11). It is characterized by comprising heat exchange with both the hot water supply water inside and the bath water in the bathtub circulating inside.

  According to the sixth aspect of the present invention, for example, by arranging the reheating heat exchanger (35) formed in a spiral shape in the hot water storage tank (10, 11), heat exchange with the bath water is performed. Thus, the medium-temperature fluid is stored in the hot water storage tank (10, 11), but it is preferable that the medium-temperature hot water supply water is taken out for the purpose of hot water supply as in the sixth aspect. . As a result, premature hot water shortage can be prevented, and a decrease in operating efficiency of the heating means (20) during the boiling operation can be prevented.

  In the invention according to claim 7, the heat exchanger (30) is configured such that the primary side and the secondary side are opposed to each other, and the hot water supply water in the hot water storage tank (10, 11) is circulated to the primary side. A heat exchanger that heats the secondary fluid that flows to the secondary side and heat exchanges between the heated secondary fluid and either the heated fluid or the heated object (60, 70).

  According to the seventh aspect of the present invention, as in the fifth and sixth aspects, the hot water supply water that is heat-exchanged by the heat exchanger (30) by being combined with the heating device (60, 70). Is an approximately medium temperature hot water supply water. Therefore, it is preferable that the intermediate temperature hot water supply water be taken out for use in hot water supply. As a result, premature hot water shortage can be prevented, and a decrease in operating efficiency of the heating means (20) during the boiling operation can be prevented.

  In the invention described in claim 8, the intermediate temperature take-out pipe (13) is provided with a plurality of at least two or more, and the first hot water temperature adjusting means (18, 18a) is configured to be distributed to the primary side. According to the eighth aspect of the present invention, the portion where the intermediate temperature hot water supply water is stored is not uniform in the vertical direction of the hot water storage tank (10, 11), so that a plurality of intermediate temperature extraction pipes (13) are provided. It is possible to positively and actively take out hot water for medium temperature hot water.

  In the invention according to claim 9, the heating means (20) is a supercritical heat pump in which the high-pressure side pressure of the refrigerant is equal to or higher than the critical pressure, and is stored in the hot water storage tank (10, 11) by the refrigerant whose pressure is increased to the critical pressure or higher. The hot water supply water is heated.

  According to the ninth aspect of the present invention, in the supercritical heat pump cycle, when the hot water is heated to a target temperature (for example, 65 to 90 ° C.), the lower the hot water temperature of the hot water before heating, the higher the pressure. The cycle efficiency (COP = heating capacity / power consumption) is improved by lowering. Therefore, by heating the low-temperature hot water supply water in the supercritical heat pump cycle, cycle efficiency is improved and power saving operation can be performed.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Hereinafter, a hot water storage type hot water supply apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing the overall configuration of a hot water storage type hot water supply apparatus to which the present invention is applied. Hot water stored in hot water storage tanks 10 and 11 is used for a hot water supply function to a kitchen, washroom, bathroom, etc. Using the stored hot water supply water as a heat source, the secondary fluid is heated and used for the heating function.

  First, as shown in FIG. 1, the hot water supply function includes two hot water storage tanks 10 and 11 for storing hot water supply water therein, and the lowermost (low temperature) hot water supply water in these hot water storage tanks 10 and 11. 11, a fluid heating passage 21 to be sent to the uppermost part of the inside 11, a heat pump unit 20 which is a heating means for heating hot water flowing through the fluid heating passage 21, and tap water is introduced into the hot water storage tanks 10, 11. A hot water supply pipe 16, a high temperature discharge pipe 12 for deriving hot water supply water in the hot water storage tanks 10, 11, an intermediate temperature discharge pipe 13, hot water supply pipes 14, 15, and a control device (hot water supply control unit) for controlling the operation of this hot water supply system 41, a heat source control unit 42).

  And the heating function is provided adjacent to the first circulation part 30a through which hot water for hot water in the hot water storage tanks 10, 11 circulates and the second circulation part 30b through which the secondary side fluid circulates. The heating heat exchanger 30 that is a heat exchanger that exchanges heat between the two fluids and the hot water in the hot water storage tanks 10 and 11 are circulated to the first circulation part 30a. A primary-side circulation circuit 31 for returning the hot-water supply water subjected to heat exchange into the hot water storage tanks 10 and 11, a secondary-side circulation circuit 32 for circulating the secondary-side fluid through the second circulation part 30b, and a heating device Are a floor heating unit 60, a heating unit 70, and a control device (hot water supply control unit 41) for controlling the primary side circulation circuit 31 and the secondary side circulation circuit 32.

  The components constituting the hot water supply function will be described more specifically. The hot water storage tanks 10 and 11 of the present embodiment are obtained by connecting two vertically long tanks in series. The lower part 10 c and the uppermost part 11 c of the second hot water storage tank 11 are connected by a communication pipe 19.

  The hot water storage tanks 10 and 11 are formed of a metal (for example, stainless steel) container having excellent corrosion resistance, and a heat insulating material (not shown) is disposed on the outer periphery so that hot water for hot water can be kept warm for a long time. It has become. In addition, an inlet 11b is provided on the bottom surface on the second hot water storage tank 11 side, and a water supply pipe 16 that is a water supply path is connected to the inlet 11b.

  The water supply pipe 16 is provided with a water supply thermistor 51 that detects the temperature of the water supply, and temperature information in the water supply pipe 16 is output to a hot water supply control unit 41 described later. Further, the water supply pipe 16 is provided with a pressure reducing check valve (not shown) that adjusts the water pressure of the tap water introduced into the introduction port 11b to a predetermined pressure and prevents the back flow of hot water in the case of water breakage or the like. Yes. Further, the downstream end of the water supply pipe 16 is connected to one inlet side of a hot water supply mixing valve 18 which is a first hot water supply temperature adjusting means, which will be described later, in addition to the introduction port 11b, and the hot water storage tanks 10 and 11 and the hot water mixing tank. Tap water is introduced into the valve 18.

  On the other hand, a lead-out port 10b is provided at the top of the first hot water storage tank 10, and hot water for leading out hot water for hot water out of the hot water stored in the first hot water storage tank 10 is provided in the lead-out port 10b. A high-temperature take-out pipe 12 as a path is connected. A discharge pipe 12a provided with an air relief valve 58 is connected in the middle of the route of the high temperature take-out pipe 12, and when the pressure in the hot water storage tanks 10 and 11 rises above a predetermined pressure, The hot water supply water in the tanks 10 and 11 is discharged to the outside so that the hot water storage tanks 10 and 11 are not damaged.

  Further, a lead-out port 11d is provided above the second hot water storage tank 11, and a hot water supply path for leading out the hot water for hot water stored in the second hot water storage tank 11 to the lead-out port 11d. The intermediate temperature extraction pipe 13 is connected. A high / middle temperature water mixing valve 17 serving as a second hot water supply temperature adjusting means is provided at the junction of the high temperature extraction pipe 12 and the intermediate temperature extraction pipe 13, and a mixed hot water path is provided downstream of the high / middle temperature water mixing valve 17. Hot water supply pipes 14 and 15 are connected, and a hot water supply mixing valve 18 serving as a first hot water supply temperature adjusting means is provided in the middle of the hot water supply pipes 14 and 15.

  The hot water supply pipes 14 and 15 are provided with hot water thermistors 52 and 53 for detecting the hot water temperature of the hot water supply water and a flow rate counter 54 for detecting the flow information of the hot water for the hot water supply pipe 15. The temperature information and the flow rate information detected by the hot water thermistors 52 and 53 and the flow rate counter 54 are output to the hot water supply control unit 41 described later.

  In addition, the downstream end of the hot water supply pipe 15 leads to a hot water tap, a shower tap, etc. (not shown) arranged in a kitchen, a bathroom, a bathroom, etc., and when those hot water taps and shower taps are opened. The hot water supply water adjusted to the set temperature set by the user is discharged. When the flow rate counter 54 detects the flow of hot water in the hot water supply pipe 15, hot water is being used in either a hot water tap or a shower tap.

  The high / medium-temperature hot water mixing valve 17 is a temperature control valve that adjusts the hot water temperature of hot water supplied to the hot water supply pipe 14, that is, the hot water supply mixing valve 18, and has an opening area on the high temperature extraction pipe 12 side and the intermediate temperature extraction pipe 13 side. By adjusting the ratio, the mixing ratio of the hot water supply water extracted from the high temperature extraction pipe 12 and the medium temperature hot water supply water extracted from the intermediate temperature extraction pipe 13 is adjusted.

  Similarly, the hot water supply mixing valve 18 is a temperature control valve that adjusts the hot water temperature of the hot water supplied to the hot water supply pipe 15, and the opening area ratio between the hot water supply pipe 14 side and the hot water supply pipe 16 side is adjusted. By adjusting, the mixing ratio between the hot water supply water adjusted by the high / medium temperature water mixing valve 17 and the tap water introduced from the water supply pipe 16 is adjusted. That is, the temperature is adjusted so that the set temperature is set by the user.

  These mixing valves 17 and 18 are electrically connected to a hot water supply control unit 41 described later, and are based on temperature information detected by the hot water thermistors 52 and 53, the water supply thermistor 51 and the hot water storage thermistor 55 described later. Controlled. Incidentally, the high / medium-temperature hot water mixing valve 17 is taken out from the high-temperature take-out pipe 12 when the hot water temperature of hot water supplied by the hot water storage thermistor 55 (near the intermediate temperature take-out pipe 13) is lower than a predetermined temperature (for example, 30 ° C.). The hot water supply water is controlled to be led out to the hot water supply pipe 14.

  However, the high / medium-temperature water mixing valve 17 at this time is controlled so as to be led out to the hot water supply pipe 14 side without temperature adjustment. On the other hand, when the hot water temperature of the hot water supply water detected by the hot water storage thermistor 55 (in the vicinity of the intermediate temperature extraction pipe 13) is equal to or higher than a predetermined temperature (for example, 30 ° C.), the medium temperature hot water supply water extracted from the intermediate temperature extraction pipe 13 or the intermediate temperature Control is performed so that both the medium-temperature hot-water supply water taken out from the take-out pipe 13 and the high-temperature hot-water supply water taken out from the high-temperature take-out pipe 12 are led out to the hot-water supply pipe 14 side.

  Specifically, the temperature of the hot water supplied to the hot water supply pipe 14 side is adjusted to a predetermined temperature (for example, about a set temperature + 5 ° C.) so that medium temperature hot water is positively extracted. ing. The mixing valves 17 and 18 are controlled so as to perform feedback control based on temperature information detected by the hot water thermistors 52 and 53.

  In addition, a plurality of hot water storage thermistors 55 (in this example, 10 locations) which are water temperature sensors for detecting the amount of hot water for storing hot water or the temperature of hot water are provided on the outer wall surfaces of the hot water storage tanks 10 and 11 in the vertical direction ( The temperature information at each water level in the hot water storage tanks 10 and 11 is arranged at substantially equal intervals in the tank height direction) and is output to the hot water supply control unit 41 described later.

  Therefore, the hot water supply control unit 41, based on the temperature information from the plurality of hot water storage thermistors 55, the heated hot water in the upper part of the first hot water storage tank 10, and before the hot water in the hot water storage tanks 10, 11 are heated up. A boundary position with low-temperature hot water supply water can be detected, and hot water temperature of hot water supply water at each water level can be detected. Of the plurality of hot water storage thermistors 55, the hot water storage thermistor 55 provided at the uppermost part has a function of detecting the temperature of hot water discharged from the hot water supply water.

  Next, the heat pump unit 20 that heats the hot water supply water in the hot water storage tanks 10 and 11 uses a supercritical heat pump cycle in which, for example, carbon dioxide gas is used as a refrigerant, so that the refrigerant pressure on the high pressure side becomes equal to or higher than the critical pressure of the refrigerant. I am using it. As is well known, this heat pump cycle includes refrigeration cycle functional parts such as a compressor, a heat storage heat exchanger, an expansion valve, an evaporator, and an accumulator (not shown). Incidentally, the compressor (not shown) is driven by a built-in electric motor (not shown), compresses the gaseous refrigerant sucked from the accumulator to a critical pressure or more, and discharges it.

  A heating heat exchanger (not shown) exchanges heat between refrigerant and hot water supply water. For example, a refrigerant passage (not shown) through which refrigerant flows and a heating fluid passage (not shown) through which hot water flows flow. This is a counterflow heating heat exchanger (not shown) provided in the heavy pipe structure and configured so that the flow direction of the refrigerant and the flow direction of the hot water supply water face each other. The expansion valve (not shown) depressurizes the refrigerant flowing out from the heating heat exchanger and supplies it to the evaporator (not shown). An evaporator (not shown) evaporates the refrigerant decompressed by an expansion valve (not shown) by heat exchange with the atmosphere. An accumulator (not shown) gas-liquid separates the refrigerant flowing out of the evaporator, sucks only the gas-phase refrigerant into the compressor, and stores excess refrigerant in the cycle.

  Further, a heating fluid passage (not shown) of the heating heat exchanger is connected to the hot water storage tanks 10 and 11 via the fluid heating passage 21 described above, and an electric pump (not shown) is operated, whereby the hot water storage tank. The hot water supply water in 10 and 11 circulates. The upstream end of the fluid heating channel 21 is connected to the bottom 11 a of the second hot water storage tank 11, and the downstream end of the fluid heating channel 21 is connected to the upper portion 10 a of the first hot water storage tank 10. Thereby, the hot water supply water heated by the heat exchange with the refrigerant in the heating heat exchanger (not shown) is sent to the upper portion 10a of the first hot water storage tank 10, so that the second hot water from the upper side of the first hot water storage tank 10 is second. Heat is sequentially stored in the hot water supply water toward the lower side of the hot water storage tank 11.

  The heat pump unit 20 is operated by a control signal from a heat source control unit 42 to be described later, and outputs an operating state to the heat source control unit 42. In addition, the AC power is used as the power source, and the heat storage operation for boiling the hot water in the hot water storage tanks 10 and 11 is performed mainly using the midnight power in the midnight time zone where the charge setting is the cheapest. Even in the time zone, when the hot water temperature of the hot water supply decreases, the boiling operation is controlled. Incidentally, according to the supercritical heat pump cycle, hot water supply water having a temperature higher than that of a general heat pump cycle (for example, 85 to 90 ° C.) can be stored therein.

  Next, the components constituting the heating function will be described. First, the primary-side circulation circuit 31 distributes the hot water in the hot water storage tanks 10 and 11 to the first distribution unit 30a of the heating heat exchanger 30 to perform heating. This is a circulation circuit for returning the hot water supply water having a substantially intermediate temperature (for example, about 20 to 45 ° C.) heat-exchanged by the heat exchanger 30 to the hot water storage tanks 10, 11. 1 circulation pump 38 is comprised.

  The upstream pipe 33 has an upstream end connected to the upper part 10e of the first hot water storage tank 10 and a downstream end connected to the first circulation part 30a. The return pipe 34 has an upstream end connected to the first circulation part 30 a and a downstream end connected to the vicinity of the outlet 11 d of the intermediate temperature extraction pipe 13 of the second hot water storage tank 11. The 1st circulation pump 38 is arrange | positioned in the middle of the return pipe 34, and is a pump which distribute | circulates the hot water supply water in the hot water storage tanks 10 and 11 to the 1st distribution part 30a.

  And it is electrically connected to the hot water supply control part 41 mentioned later so that a rotation speed may be controlled based on the temperature information detected by the thermistor 56 after heat exchange mentioned later. Incidentally, the first circulation pump 38 controls the rotation speed so that the hot water temperature after the heat exchange of the secondary side fluid becomes a predetermined temperature.

  In the heat exchanger 30 for heating, the upstream end of the first circulation part 30a is connected to the forward pipe 33 and the downstream end is connected to the return pipe 34, the upstream end of one second circulation part 30b is connected to the forward pipe 36, and the downstream end is Connected to the return pipe 37. Therefore, the heating heat exchanger 30 has a flow direction of hot water for hot water flowing from the top to the bottom through the first circulation part 30a and a second circulation part 30b from the bottom as shown by arrows in FIG. It is a counterflow type heat exchanger with which the flow direction of the secondary side fluid which flows toward is opposed.

  The secondary-side circulation circuit 32 is a circulation circuit that circulates the secondary-side fluid exchanged by the heating heat exchanger 30 to the floor heating unit 60 and the heating unit 70, and includes an outgoing pipe 36, a return pipe 37, and a bypass passage. 32a, the second circulation pump 39, and the thermistor 56 after heat exchange. The forward pipe 36 is a forward side circuit for guiding the secondary side fluid exchanged by the heating heat exchanger 30 to the floor heating unit 60 and the heating unit 70, and the return pipe 37 is the floor heating unit 60 and the heating unit. 70 is a return side circuit for returning the secondary fluid heat-exchanged in 70 to the second circulation part 30b, and the bypass passage 32a is used for floor heating when a thermal valve 62 and an on-off valve 73 described later are all closed. This is a bypass circuit that bypasses the unit 60 and the heating unit 70.

  The second circulation pump 39 is a pressure feeding means for circulating the secondary fluid from the second circulation part 30b to the floor heating unit 60 and the heating unit 70. Based on the number of floor heating units 60 and the number of heating units 70 used, The number of rotations is controlled by a hot water supply control unit 41 described later. The post-heat exchange thermistor 56 is a sensor that detects the hot water temperature of the secondary-side fluid that circulates in the second flow part 30b, and the temperature information detected by the post-heat exchange thermistor 56 is supplied to the hot water supply control part 41 described later. It is designed to output.

  The floor heating unit 60 is, for example, a heating device that is installed on a floor such as a washroom or a kitchen, and heats the floor panel 61 that is an object to be heated by circulating a secondary side fluid through a pipe 61a in the floor panel 61. A thermal valve 62 that opens and closes the secondary fluid flowing through the pipe 61a, a water temperature sensor (not shown) that detects the outlet water temperature of the floor panel 61, and a thermal valve that is based on the outlet water temperature detected by the water temperature sensor. It is comprised from the floor warming control part (not shown) which controls 62. In the present embodiment, only one floor heating unit 60 is installed. However, two or more plural units may be provided in parallel to the heating heat exchanger 30.

  The heating unit 70 is, for example, a heating device that sucks in indoor air that is a fluid to be heated in a bathroom or a washroom and heats it with a radiator 71, blows out warm air, and heats the room. A blower 72, an on-off valve 73 for opening and closing the secondary fluid flowing through the radiator 71, a suction temperature sensor (not shown) for detecting the suction temperature, and the blower 72 based on the suction temperature detected by the suction temperature sensor A heating control unit (not shown) for controlling the on-off valve 73 is configured. In the present embodiment, only one heating unit 70 is installed, but two or more plural units may be provided in parallel to the heating heat exchanger 30.

  Next, the hot water supply control unit 41 is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset control program, and each of the thermistors 51 to 53, 55, and 56 Temperature information, flow rate information from each flow rate counter 54, operation signal from an operation switch provided on an operation panel (not shown), etc., high temperature extraction pipe 12, intermediate temperature extraction pipe 13, hot water supply pipes 14, 15, primary It is configured to control various actuators in the side circulation circuit 31 and the secondary side circulation circuit 32.

  Similarly to the hot water supply control unit 41, the heat source control unit 42 is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset control program, not shown. The actuators in the heat pump unit 20 are controlled based on temperature information from various thermistors. In this heat source control unit 42, a hot water storage thermistor (topmost part) 55 that detects the temperature of the hot water supply water after heating in order to keep the hot water temperature of the hot water supplied by a heating heat exchanger (not shown) at a constant temperature. The rotational speed of an electric pump (not shown) is controlled based on the detected temperature.

  In the present embodiment, one intermediate temperature extraction pipe 12 for extracting intermediate temperature hot water supply water is provided in the second hot water storage tank 11. However, the present invention is not limited to this, and as shown in FIG. May be provided above the vicinity of the downstream end of the return pipe 34 and a switching valve 59 for selecting any one of them may be provided. According to this, medium-temperature hot water supply water can be easily detected and taken out of the hot water supply water stored in the hot water storage tank 10. Furthermore, although the intermediate temperature extraction pipe 12 is provided only in the second hot water storage tank 11, the present invention is not limited thereto, and may be provided in a lower portion of the first hot water storage tank 10.

  Next, the operation of the hot water storage type hot water supply apparatus having the above configuration will be described. First, when a power switch (not shown) is turned on, for example, when a midnight time zone is reached, the heat source control unit 42 causes the heat pump cycle parts (not shown) in the heat pump unit 20 and actuators such as an electric pump (not shown) to be connected. The hot water supply water in the hot water storage tanks 10 and 11 is heated under control to store hot water supply water at a high temperature (for example, 85 ° C.).

  The hot water stored in the hot water storage tanks 10 and 11 is supplied to the kitchen, washroom, bathroom, etc. for hot water supply, and the secondary fluid is heated using the stored hot water for hot water as a heat source. The floor heating unit 60 and the heating unit 70 are used for heating. Therefore, the operation of the apparatus when the floor heating unit 60 or the heating unit 70 is operated will be described. When the operation switch (not shown) is operated in the floor warming unit 60, the thermal valve 62 is opened, and the second circulation pump 39 is operated. Thereby, a secondary side fluid distribute | circulates to the piping 61a.

  In the heating unit 70, when an operation switch (not shown) is operated, the on-off valve 73 is opened, the secondary fluid is circulated through the radiator 71, and then the blower 72 is activated so that the indoor air is discharged from the radiator 71. Heated. Then, when the secondary side fluid flows, the first circulation pump 38 is operated, and the hot water for hot water in the first hot water storage tank 10 is circulated to the first circulation portion 30a, and the secondary side fluid is circulated in the first circulation portion 30a. The hot water supply water exchanged with the water is returned to the second hot water storage tank 11.

  Here, the rotation speed of the first circulation pump 38 and the second circulation pump 39 is controlled so that the hot water temperature of the secondary fluid detected by the thermistor 56 after heat exchange becomes a predetermined temperature. As a result, the flow rate flowing in the primary side circulation circuit 31 is set, and the flow rate of the secondary side fluid flowing in the secondary side circulation circuit 32 is set. Incidentally, the predetermined temperature of the hot water of the secondary fluid detected by the thermistor 56 after heat exchange is set to be different between the floor heating unit 60 and the heating unit 70, for example, when the floor heating unit 60 is operating. Is about 60 ° C., or about 80 ° C. when only the heating unit 70 is in operation. This is done so as not to exceed the hot water temperature in the temperature range that is optimal for floor heating.

  As a result, the substantially hot water supply water that has been heat-exchanged by the secondary fluid flowing through the second flow passage 30b is returned into the second hot water storage tank 11. Therefore, in the present embodiment, the hot water for hot water returned to the second hot water storage tank 11 when used for hot water supply is taken out from the intermediate temperature take-out pipe 13, and specifically, hot water supply (not shown). When the faucet or the shower faucet is opened and flow rate information is output from the flow counter 54 to the hot water supply control unit 41, the high / middle temperature water mixing valve 17 and the hot water supply mixing valve 18 are controlled to adjust the temperature of the hot water supply water.

  Specifically, when the hot water temperature in the hot water storage tanks 10, 11 detected by the hot water storage thermistor 55 is equal to or higher than a predetermined temperature (for example, 30 ° C.) in the high / medium temperature water mixing valve 17, the hot water is extracted from the intermediate temperature extraction pipe 13. More than a predetermined temperature (for example, set temperature + 5 ° C.) by mixing from both the medium temperature heat storage fluid or the medium temperature hot water supply water extracted from the medium temperature extraction pipe 13 and the high temperature water supply water extracted from the high temperature extraction pipe 12 The hot water supply water at the hot water temperature is controlled to flow through the hot water supply pipe 14.

  As a result, a large amount of medium-temperature hot-water supply water is circulated through the hot-water supply pipe 14, whereby low-temperature tap water is introduced into the lower portion of the second hot water storage tank 11 from the water-supply pipe 16. For example, immediately after boiling by the heat pump unit 20 or when the floor heating unit 60 or the heating unit 70 is not operated, the temperature of the hot water in the hot water storage tanks 10 and 11 detected by the hot water storage thermistor 55 is the predetermined temperature ( For example, it may be less than 30 ° C. At this time, the hot water supply water extracted from the high temperature extraction pipe 12 is controlled to flow through the hot water supply pipe 14 as it is.

  Then, in the hot water supply mixing valve 18, the hot water supply water and the tap water from the water supply pipe 16, whose temperature is adjusted by the high / middle temperature water mixing valve 17, based on the temperature information detected by the hot water thermistor 51 and the hot water thermistors 52 and 53. The hot water supply water mixed and adjusted to the set temperature is discharged. When the hot water supply water is discharged from the hot water supply pipe 15 and the consumption of the medium temperature hot water is small, the medium temperature hot water supply water in the hot water storage tanks 10 and 11 has a specific gravity difference over time. As a result, an intermediate layer (medium temperature) is formed between the upper temperature and the lower temperature.

  According to the hot water storage type hot water supply apparatus according to the first embodiment described above, the hot water for the hot water is exchanged with the secondary side fluid by the heat exchanger 30 for heating, and the hot water having a substantially medium temperature with a low hot water temperature is stored in the hot water storage tanks 10 and 11. The hot water mixing water 18 stored in the hot water storage tanks 10 and 11 is added to the hot water supply water stored in the hot water storage tanks 10 and 11, or the heat exchanger 30 for heating. It is configured to flow in either hot water for medium temperature including hot water for which heat has been exchanged by hot water or hot water for high temperature and medium temperature. Can be consumed. As a result, hot water shortage is prevented at an early stage, and low-temperature hot water supply water can be sucked and heated, so that a reduction in operating efficiency of the heat pump unit 20 during the boiling operation can be prevented.

  Further, specifically, it is configured such that the substantially hot water having a low hot water temperature exchanged by the heat exchanger 30 for heating is taken out from the medium temperature take-out pipe 13 and flows into one side of the hot water mixing valve 18. As a result, the medium-temperature hot water supply water can be actively consumed for the purpose of hot water supply, so that early hot water shortage can be prevented and a decrease in operating efficiency of the heat pump unit 20 during the boiling operation can be prevented.

  More specifically, second hot water supply temperature adjusting means for mixing hot water for hot water taken out from the high temperature take-out pipe 12 and medium-temperature hot water for hot water taken out from the medium-temperature take-out pipe 13 to adjust to a predetermined hot water temperature. By providing the high / medium temperature water mixing valve 17, it is possible to easily take out the medium temperature hot water supply water stored in the hot water storage tanks 10, 11.

  Further, a hot water storage thermistor 55 that is a water temperature sensor for detecting the hot water temperature of the hot water supply water is provided in the vicinity of the upstream end of the intermediate temperature extraction pipe 13, and the high / medium temperature water mixing valve 17 is provided with temperature information detected by the hot water storage thermistor 55. On the basis of the hot water supply water, the medium temperature hot water supply water, or both the high temperature hot water supply water and the medium temperature hot water supply water to the primary side of the hot water mixing valve 18, Among the hot water supply water stored in, medium temperature hot water supply water can be reliably taken out.

  The heating heat exchanger 30 is configured such that the primary side and the secondary side are opposed to each other, and the hot water in the hot water storage tanks 10 and 11 is circulated to the primary side and circulated to the secondary side. A heat exchanger that heats the secondary fluid, and includes a floor warming unit 60 and a heating unit 70 that exchange heat between the heated secondary fluid and either the fluid to be heated or the object to be heated. By combining heating devices such as the floor warming unit 60 and the heating unit 70, the hot water supplied by the heat exchanger 30 for heating is an approximately medium temperature hot water supply water. It is suitable to be configured to take out. As a result, premature hot water shortage can be prevented, and a decrease in operating efficiency of the heat pump unit 20 during the boiling operation can be prevented.

  Further, the intermediate temperature take-out pipe 13 is provided with a plurality of at least two or more, and is configured so that any one of the medium temperature hot water supply water is selected and distributed to the primary side of the hot water supply mixing valve 18. Since the portion where the intermediate temperature hot water supply water is stored is not uniform in the vertical direction of the hot water storage tanks 10 and 11, the intermediate temperature hot water supply water can be positively and positively extracted.

  The heat pump unit 20 is a supercritical heat pump in which the high-pressure side pressure of the refrigerant is equal to or higher than the critical pressure, and supercritical water is heated by heating the hot water in the hot water storage tanks 10 and 11 with the refrigerant whose pressure is increased to the critical pressure or higher. In the heat pump cycle, when heating hot water to a target temperature (for example, 65 to 90 ° C.), the lower the hot water temperature of the hot water before heating, the lower the high-pressure pressure, thereby reducing the cycle efficiency (COP = heating capacity / (Power consumption) is improved. Therefore, by heating the low-temperature hot water supply water in the supercritical heat pump cycle, cycle efficiency is improved and power saving operation can be performed.

(Second Embodiment)
In the first embodiment described above, the hot water stored in the hot water storage tanks 10 and 11 is used for a hot water supply function to a kitchen, a washroom, a bathroom, and the like, and the stored hot hot water is used as a heat source. However, the present invention is not limited to this, and it may be used for a function of chasing bath water in addition to the heating function.

  In this embodiment, hot water stored in the hot water storage tanks 10 and 11 is used for a hot water supply function to a kitchen, a washroom, a bathroom, etc., and the hot water stored in the hot water tank and the hot water supply to the bathtub are used as a heat source. It also has a function of chasing bath water filled with hot water. FIG. 3 is a schematic diagram showing the overall configuration of the hot water storage type hot water supply apparatus in the present embodiment. Here, the same components as those in the first embodiment are denoted by the same reference numerals and the description of the components is omitted.

  As shown in FIG. 1, the hot water storage type hot water supply apparatus of the present embodiment is provided with a component for hot water filling to the bathtub and a component for chasing the bath water in the bathtub in the hot water supply function configuration. It is. First, the components in the hot water filling function will be described. This hot water filling function is to mix hot water supply water and tap water through the hot water supply pipes 14a and 15a and discharge to the bathtub so that hot water and hot water including hot water filling can be provided. Yes. Specifically, the hot water supply pipes 14 a and 15 a branched from the hot water supply pipe 14 are connected to a branch point 82 a provided in the bath water circulation circuit 81.

  A hot water filling mixing valve 18a, which is a first hot water supply temperature adjusting means, is provided at the junction of the downstream end of the hot water supply piping 14a and the water supply piping 16, and the hot water supply piping is provided at the outlet side of the hot water filling mixing valve 18a. 15a is connected. The hot water supply pipe 15a is provided with a hot water supply thermistor 53a, a hot water on / off valve 57, a hot water flow rate counter 54a, and a check valve 80 in this order from the upstream side.

  The hot water filling mixing valve 18a is a temperature control valve that adjusts the hot water temperature of hot water to be discharged from the hot water supply pipe 15a in the same manner as the hot water supply mixing valve 18 described above, and adjusts the ratio of the respective opening areas. Thus, the mixing ratio between the hot water for which the temperature is adjusted by the high / middle temperature water mixing valve 17 and the tap water introduced from the water supply pipe 16 is adjusted to be adjusted to the set temperature. Furthermore, the hot water filling mixing valve 18a is electrically connected to a hot water supply control unit 41, which will be described later, and the temperature of hot water supply water detected by the above-described hot water supply thermistor 51, hot water thermistor 52, and hot water hot water supply thermistor 53a. Control based on information.

  The hot water filling on / off valve 57 is an electromagnetic valve that is controlled by a hot water supply control unit 41, which will be described later, and opens and closes the mixed hot water flowing through the hot water supply pipe 15a. The hot water flow rate counter 54a detects the mixed hot water flow rate flowing in the hot water supply pipe 15a, and outputs the flow rate information detected by the hot water flow rate counter 54a to the hot water supply control unit 41 described later. Yes. The check valve 80 is a valve for preventing the bath water in the bath water circulation circuit 81 from flowing into the hot water supply pipe 15a.

  When the hot water filling on / off valve 57 is opened to fill the bathtub with hot water, hot water, or hot water, the on / off valve 86, which will be described later, is also controlled to open and detected by the water pressure switch 85. When the set water level reaches a predetermined level, the hot water on / off valve 57 and the on / off valve 86 are closed, and the set hot water is filled in the bathtub. Further, the hot water and the hot water are controlled so that the mixed hot water of a predetermined flow rate is discharged based on the flow rate information detected by the hot water flow rate counter 54a.

  Next, the component parts of the tracking function will be described. The bath water circulation circuit 81 is a circulation circuit for circulating the bath water in the bathtub to the reheating heat exchanger 35 that is a heat exchanger. The reheating heat exchanger 35, the forward pipe 82, the return pipe 83, and the bypass It consists of a tube 84. Further, the forward pipe 82 is provided with a water pressure switch 85, an on-off valve 86, a third circulation pump 87, a bath water temperature thermistor 88, a flowing water switch 89, and a reheating three-way valve 90 in order from the upstream side. Further, the return pipe 83 is provided with a reflow thermistor 91 on the downstream side.

  The reheating heat exchanger 35 according to the present embodiment is, for example, a heat exchanger constituted by pipes formed in a spiral shape and disposed above the first hot water storage tank 10. According to this, the hot water supply water in the first hot water storage tank 10 and the bath water are subjected to heat exchange. The water pressure switch 85 is a sensor that detects the amount of hot water in the bathtub filled with hot water, in other words, the water pressure for determining the water level in the bathtub. The on-off valve 86 is an electromagnetic valve that opens and closes the bath water circulation circuit 81, and the third circulation pump 87 is an electric pump that pumps the bath water in the bathtub to the reheating heat exchanger 35. The bath water temperature thermistor 88 is a water temperature sensor that detects the hot water temperature of the bath water flowing through the forward pipe 82.

  The flowing water switch 89 is a flowing water sensor for detecting whether bath water and hot water supply water to be described later are circulating in the direction of the follow-up three-way valve 90. The reheating three-way valve 90 is a switching valve for switching the flow direction to either one of the bypass pipe 84 that causes the bath water to flow to the reheating heat exchanger 35 or bypasses the reheating heat exchanger 35. . The reheating thermistor 91 is a water temperature sensor that detects the hot water temperature of the bath water flowing through the return pipe 93, and is the bath water temperature returned to the bathtub.

  The water pressure switch 85, the flowing water switch 89, the bath water temperature thermistor 88, and the reheating thermistor 91 are configured to output volume information, flowing water information, and temperature information to the hot water supply control unit 41, which will be described later. The three-circulation pump 87 and the reheating three-way valve 90 are controlled by a hot water supply control unit 41 described later. Further, when detecting the temperature of the bath water in the bathtub after filling with hot water, the flow direction of the reflow three-way valve 90 is switched to the bypass pipe 84 side and the third circulation pump 87 is operated, so that the bath in the bathtub is operated. Water is circulated in the order of the forward pipe 82, the bypass pipe 84, the return pipe 83, and the bathtub, and the bath water temperature thermistor 88 detects the bath water temperature.

  Further, when reheating, the flow direction of the reflowing three-way valve 90 is switched to the reheating heat exchanger 35 side, so that the bath water in the bathtub flows in the forward pipe 82, the reheating heat exchanger 35, and the return pipe. 83. The bath water is circulated in this order, and is controlled to circulate until the bath water temperature detected by the bath water temperature thermistor 88 reaches a predetermined temperature.

  Next, the operation of chasing the bath water of the hot water storage type hot water supply apparatus having the above configuration will be described. When the reheating switch (not shown) is operated, the bath water temperature is detected every predetermined time, and if the bath water temperature does not reach the reheating set temperature, the bath water is heated. To do. That is, the hot water control unit 41 activates the follow-up three-way valve 90, the on-off valve 86, and the third circulation pump 87 after a predetermined time to circulate the bath water in the bathtub in the order of the forward pipe 82, the bypass pipe 84, and the return pipe 83. Let

  At this time, the bath water temperature is detected by the bath water temperature thermistor 88. If the detected bath water temperature is equal to or lower than the reheating set temperature, the flow direction of the reheating three-way valve 90 is switched to the reheating heat exchanger 35 side, and the bath water is circulated to the reheating heat exchanger 35. As a result, the bath water is heated by receiving hydrothermal energy for hot water supply. When the bath water temperature reaches the set temperature, the flow direction of the follow-up three-way valve 90 is switched to the bypass pipe 84 side, the on-off valve 86 is closed, and the third circulation pump 87 is stopped. Thus, the bath water is kept warm so as to maintain the set temperature.

  By replenishing the bath water, hot water having a medium temperature that is almost the same as the bath water temperature is stored in the first hot water storage tank 10, but this medium temperature hot water has a difference in specific gravity with time. As a result, an intermediate layer (medium temperature) is formed between the upper temperature and the lower temperature. Therefore, when hot water is supplied, the medium-temperature hot-water supply stored is actively taken out from the intermediate-temperature take-out pipe 13, whereby low-temperature tap water is introduced into the lower part of the second hot-water tank 11 from the water supply pipe 16. The As a result, medium-temperature hot water supply water is not sucked during the boiling operation.

  Moreover, in this embodiment, the hot water for hot water stored in the hot water storage tanks 10 and 11 can be actively consumed by filling the bathtub with hot water. The operation when hot water is filled in the bathtub will be described. By operating a hot water filling switch (not shown), the hot water supply control unit 41 opens the hot water filling on-off valve 57 and the on-off valve 86. As a result, the water faucet at the upstream end of the hot water supply pipe 15a is opened. Therefore, when the flow rate information is output to the hot water supply control unit 41 by the flow rate counter 54a, the high / middle temperature water mixing valve 17 and the reheating water supply valve are used. The mixing valve 18a is controlled to adjust the temperature of the hot water supply water.

  Specifically, as in the first embodiment, when the hot / cold hot water temperature in the hot water storage tanks 10 and 11 detected by the hot water storage thermistor 55 is equal to or higher than a predetermined temperature (for example, 30 ° C.) in the high / middle temperature water mixing valve 17. Is mixed with both a medium temperature heat storage fluid taken out from the medium temperature takeout pipe 13 or a medium temperature hot water supply water taken out from the medium temperature takeout pipe 13 and a high temperature hot water supply water taken out from the high temperature takeout pipe 12 (for example, The hot water supply water having a hot water temperature equal to or higher than the preset temperature + 5 ° C. is controlled to flow through the hot water supply pipes 14 and 14a.

  As a result, a large amount of medium-temperature hot-water supply water is circulated through the hot-water supply pipes 14, 14 a, so that low-temperature tap water is introduced into the lower portion of the second hot water storage tank 11 from the water-supply pipe 16. Next, in the refueling mixing valve 18a, hot water supply water whose temperature has been adjusted by the high / middle temperature water mixing valve 17 based on the temperature information detected by the water supply thermistor 51 and the hot water thermistors 52 and 53a, and the water supply from the water supply pipe 16. Water is mixed to replenish hot water supply water adjusted to a preset temperature.

  According to the hot water storage type hot water supply apparatus of the second embodiment described above, by replenishing the bath water with the reheating heat exchanger 35, the hot water having a substantially intermediate temperature with the low temperature of the heat exchanged is stored in the hot water storage tank 10, 11 is stored in the hot water supply and hot water filling, the hot water supply is actively consumed to prevent early hot water shortage as in the first embodiment, and the low temperature hot water supply water is sucked and heated. Therefore, the operating efficiency of the heat pump unit 20 can be prevented from being lowered during the boiling operation.

  In the present embodiment, the reheating heat exchanger 35 is disposed in the first hot water storage tank 10. However, the present invention is not limited to this, and the hot water storage tank is similar to the heating heat exchanger 30 of the first embodiment. 10 and 11 may be installed outside and the bath water may be circulated to the second circulation part 30b.

(Other embodiments)
In the above embodiment, the hot water storage tanks 10 and 11 are divided into two and configured in series. However, the present invention is not limited to this, and the hot water storage tanks 10 and 11 may be divided into two or more and connected. In the first embodiment, the heating unit 70 is constituted by a hot air heater, but in addition to these, the heating unit 70 can be applied to a bathroom dryer and a clothes dryer.

  In addition, the present invention is applied to the hot water storage type hot water supply apparatus in which the hot water supply function and the heating function are combined in the first embodiment, and the hot water storage function and the hot water filling and reheating function are combined in the second embodiment. Further, the present invention may be applied to a hot water storage type hot water supply apparatus that combines a heating function with hot water filling and reheating functions. Furthermore, in the above embodiment, the heat pump unit 20 using carbon dioxide as the refrigerant has been described as a heat source device. However, the present invention is not limited to this, and a general heat pump cycle using a refrigerant such as Freon or alternative Freon may be used.

It is a schematic diagram which shows the whole structure of the hot water storage type water heater in 1st Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type water heater in the modification of 1st Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type water heater in 2nd Embodiment of this invention.

Explanation of symbols

10 ... 1st hot water storage tank (hot water storage tank)
11 ... Second hot water storage tank (hot water storage tank)
12 ... High temperature extraction pipe 13 ... Medium temperature extraction pipe 17 ... High / medium temperature water mixing valve (second hot water supply temperature adjusting means)
18 ... Mixing valve for hot water supply (first hot water supply temperature adjusting means)
18a ... Remixing valve (first hot water supply temperature adjusting means)
20 ... Heat pump unit (heating means)
30 ... Heat exchanger for heating (heat exchanger)
35 ... Reheating heat exchanger (heat exchanger)
55 ... Hot water storage thermistor (water temperature sensor)

Claims (9)

A hot water storage tank (10, 11) that is connected to at least two or more and stores hot water supply water therein, and a heat pump cycle, and exchanges heat between the high pressure refrigerant and the hot water supply water in the hot water storage tank (10, 11). In a hot water storage type hot water supply apparatus comprising a heating means (20) for heating,
A heat exchanger (30, 35) for exchanging heat between hot water stored in the hot water storage tank (10, 11) and the fluid to be heated;
First hot water temperature adjusting means (18, 18a) for adjusting hot water temperature stored in the hot water storage tanks (10, 11) flowing into one side and tap water flowing into the other side to a desired hot water temperature. ) And
The first hot water supply temperature adjusting means (18, 18a) exchanges heat with hot water supply water out of the hot water supply water stored in the hot water storage tank (10, 11) or the heat exchanger (30, 35). A hot water storage type hot water supply apparatus configured to flow into one side of medium temperature hot water supply water including hot water supply water or high temperature and medium temperature hot water supply water. The hot water storage tanks (10, 11) are provided with a high temperature extraction pipe (12) for extracting hot water for hot water supply and an intermediate temperature extraction pipe (13) for extracting medium temperature hot water for water supply,
The first hot water supply temperature adjusting means (18, 18a) is a hot water supply water extracted from the high temperature extraction pipe (12), a medium temperature hot water supply water extracted from the intermediate temperature extraction pipe (13), or the high temperature extraction pipe. The high temperature hot water supply water taken out from (12) and the medium temperature hot water supply water taken out from the intermediate temperature extraction pipe (13) are configured to flow into one side. Hot water storage water heater. Second hot water supply temperature adjusting means for adjusting the hot water temperature to a predetermined temperature by mixing the hot water for hot water taken out from the high temperature take-out pipe (12) and the medium-temperature hot water for hot water taken out from the intermediate temperature take-out pipe (13) 17)
The first hot-water supply temperature adjusting means (18, 18a) flows hot water supply water whose temperature is adjusted to a predetermined temperature by the second hot-water supply temperature adjusting means (17) into one side. Item 3. A hot water storage type hot water supply apparatus according to Item 2. A water temperature sensor (55) for detecting the hot water temperature of the hot water supply water is provided in the vicinity of the upstream end of the intermediate temperature extraction pipe (13),
The second hot water supply temperature adjusting means (17) is configured to supply hot water for hot water extracted from the high temperature extraction pipe (12) or the intermediate temperature extraction pipe (13) based on the temperature information detected by the water temperature sensor (55). The first hot water supply temperature adjusting means is used for the medium temperature hot water supply water taken out from the high temperature hot water supply pipe (12) and the intermediate temperature hot water supply water taken out from the intermediate temperature discharge pipe (13). The hot water storage type hot water supply device according to claim 3, wherein the hot water supply device is made to flow into a primary side of (18, 18a).   The heat exchanger (30, 35) is a reheating heat exchanger (30, 35) for exchanging heat between the hot water stored in the hot water storage tank (10, 11) and the bath water in the bathtub. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4, wherein the hot water storage type hot water supply apparatus is provided.   The reheating heat exchanger (35) is disposed in a portion of the hot water storage tank (10, 11) where hot hot water supply water is stored, and the hot water supply water in the hot water storage tank (10, 11) is disposed inside. 6. The hot water storage type hot water supply apparatus according to claim 5, wherein the hot water storage type hot water supply apparatus is configured to exchange heat with both bath water in a circulating bathtub.   The heat exchanger (30) is configured so that the primary side and the secondary side are opposed to each other, and the hot water in the hot water storage tank (10, 11) is circulated to the primary side and circulated to the secondary side. And a heating device (60, 70) for exchanging heat between the heated secondary fluid and either the heated fluid or the heated object. The hot water storage type hot water supply device according to any one of claims 1 to 6, wherein the hot water storage type hot water supply device is provided.   The intermediate temperature take-out pipe (13) is provided with a plurality of at least two, and one of the medium temperature hot water supply water is selected and distributed to the primary side of the first hot water supply temperature adjusting means (18, 18a). The hot water storage type hot water supply device according to any one of claims 1 to 7, wherein the hot water storage type hot water supply device is configured.   The heating means (20) is a supercritical heat pump in which the high-pressure side pressure of the refrigerant is equal to or higher than the critical pressure, and heats hot water in the hot water storage tank (10, 11) with the refrigerant whose pressure is increased to the critical pressure or higher. The hot water storage type hot water supply apparatus according to any one of claims 1 to 8, characterized in that:

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