JP4207867B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage hot water supply apparatus including two hot water storage tanks for storing hot water for heating heated by a heating means, and in particular, when the stored hot water for water is subjected to heat exchange and output to an application such as heating. It relates to the consumption of hot water for medium hot water.

  Conventionally, as this type of hot water storage type hot water supply apparatus, a hot water storage tank that stores hot water supply water and a heat pump cycle, heating means that heats the high temperature refrigerant and the hot water supply water in the hot water storage tank by heat exchange, 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 In addition to the purpose of hot water supply, the hot water storage type hot water supply device used for heating purposes such as floor heating and bathroom heating is known in addition to the purpose of hot water supply using the stored hot water supply water ( For example, see Patent Document 1.)

In addition, 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 reheating 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 chasing bath water using the stored hot water supply water as a heat source in addition to the purpose of supplying hot water supply water (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 temperature of the hot water returned to the inside of the hot water storage tank is lowered in order to use it 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 period other than the midnight time zone, 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 boiling hot water to a target hot water storage temperature (for example, 65 to 90 ° C.), a medium temperature (for example, about 20 to 45 ° C.) is used. When a large amount of hot water supply water is stored in the hot water storage tank, the higher the hot water storage temperature of the hot water supply water before heating, the higher the high-pressure pressure, and the lower the operating efficiency (COP = heating capacity / power consumption).

  In addition, when hot water is stored in two hot water storage tanks and one of the hot water storage tanks is output by the heat exchanger described above, the hot hot water stored in the other hot water storage tank is heated to the medium temperature. The hot water supply may be hindered by relaxing with hot water for hot water supply.

  Accordingly, an object of the present invention is to take the above-mentioned points into consideration, and when two hot water storage tanks are provided, hot water supply water is stored on the first hot water storage tank side, and medium temperature hot water supply water is actively used as a hot water supply path. An object of the present invention is to provide a hot water storage type hot water supply apparatus that can prevent hot water shortage and prevent a decrease in operating efficiency of the heating means by being configured to discharge hot water.

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 invention, the first hot water storage tank (10) for storing hot water supply water and the upper part (11C) communicate with the lower part (10C) of the first hot water storage tank (10), and the lower part ( 11b) a second hot water storage tank (11) for internally storing hot water supply water from a water supply pipe (16) connected to 11b), and a low temperature hot water supply water stored in the second hot water storage tank (11). A heating means (20) for exchanging heat with the refrigerant and boiled and pumped to the upper part (10a) of the first hot water storage tank (10); and hot water for hot water stored in the first hot water storage tank (10); A hot water storage type hot water supply apparatus comprising a heat exchanger (30, 35) for exchanging heat with a fluid to be heated and converting high temperature hot water stored in the first hot water storage tank (10) into medium temperature hot water. In
When the hot water storage temperature in the first hot water storage tank (10) decreases due to the output of the heat exchanger (30, 35), the hot hot water supply water in the second hot water storage tank (11) and the first hot water storage tank (10) A means for replacing the medium-temperature hot water supply water in the inside is provided, and the means for replacing the temperature is such that the upper hot water storage temperature in the first hot water storage tank (10) is higher than the upper hot water storage temperature in the second hot water storage tank (11). When the temperature drops, the hot water for hot water in the upper part (11C) of the second hot water storage tank (11) flows into the upper part (10f) of the first hot water storage tank (10), and the first hot water storage tank (10). The hot water supply water in the middle temperature is made to flow into the second hot water storage tank (11), and the hot water supply water in the first hot water storage tank (10) is placed in an intermediate portion of the first hot water storage tank (10). Hot water supply pipe leading to the hot spring terminal ( Medium-temperature takeout pipe of 4,15) (13) is characterized in that it is connected.

According to the first aspect of the present invention, the hot water for the hot water is exchanged with the fluid to be heated by the heat exchanger (30, 35), and the hot water for the hot water having a low hot water temperature is stored in the first hot water tank (10). Although it is returned and increases, the high-temperature hot water supply water in the second hot water storage tank (11) is replaced with the first hot water storage tank (10) from the top, so that the high temperature in the second hot water storage tank (11) is increased. The hot water supply water can be used for hot water supply without being moderated by medium temperature hot water supply water.
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.
Also, take out the medium-temperature hot water supply water whose temperature is low, which has been heat-exchanged by the heat exchanger (30, 35), from the medium-temperature extraction pipe (13), and actively consume the medium-temperature water supply water for the purpose of hot water supply. Therefore, it is possible to prevent the hot water from running out at an early stage and to prevent the operating efficiency of the heating means (20) from being lowered during the boiling operation.

According to the second aspect of the present invention, the second hot water temperature adjusting means (17) for adjusting the hot water supply water flowing into the one side and the medium temperature hot water flowing into the other side to adjust to the predetermined temperature hot water supply water. When,
First hot water temperature adjusting means for adjusting a desired hot water temperature by mixing hot water for hot water having a predetermined temperature adjusted by the second hot water temperature adjusting means (17) flowing into one side and tap water flowing into the other side. (18, 18a) are provided,
The second hot water supply temperature adjusting means (17) allows hot water for hot water in the first hot water storage tank (10) to flow into one side, and an intermediate temperature hot water supply in the first hot water storage tank (10) to the other side. It is characterized by being configured to allow irrigation water to flow in.

According to the second aspect of the present invention, it is possible to actively consume medium-temperature hot water for use in hot water supply. 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 described in claim 3, the second hot water supply temperature adjusting means (17) includes a medium temperature hot water supply water in the first hot water storage tank (10) on the other side, and an inside of the second hot water storage tank (11). It is characterized by flowing in hot water for hot water .

According to the third aspect of the present invention, the hot water for medium temperature hot water in the first hot water storage tank (10) and the hot water for medium temperature hot water in the second hot water storage tank (11) generated by the switching means are both hot water. Can be actively consumed for use. 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 4, the first hot water storage tank (10) is provided with a high temperature extraction pipe (12) for taking out hot water for hot water supply , and the first hot water storage tank (10) and the second hot water storage tank ( 11) is provided with an intermediate temperature extraction pipe (13) for taking out hot water for hot water supply, and the second hot water supply temperature adjusting means (17) is connected to the high temperature extraction pipe (12) on one side and the other side. The side is connected to the intermediate temperature extraction pipe (13).

  Specifically, according to the fourth aspect of the present invention, the second 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 connecting to the other side of the hot water supply temperature adjusting means (17), the medium temperature hot water supply water can be actively consumed for the purpose of hot water supply. A decrease in the operating efficiency of the heating means (20) can be prevented.

  In the invention according to claim 5, at least two or more intermediate temperature extraction pipes (13) are provided, and any one of the medium temperature hot water supply water is selected to select second hot water supply temperature adjustment means (17). It is characterized in that it is configured to circulate on the other side.

  According to the fifth 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 first and second hot water storage tanks (10, 11), so that a plurality of intermediate temperature extraction pipes (13) are provided. By providing, it is possible to positively and positively take out hot water for hot water supply accurately and positively.

  In the invention according to claim 6, the heat exchanger (30, 35) is a reheating heat exchanger (35) for exchanging heat between hot water in the first hot water storage tank (10) and bath water in the bathtub. It is characterized by being.

  According to the sixth aspect of the present invention, since the hot water supplied by the heat exchanger (30, 35) by the reheating of the bath water is a hot water supply water having an intermediate 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 according to claim 7, the reheating heat exchanger (35) is disposed in a portion of the first hot water storage tank (10) where the hot water for hot water is stored, and the hot water for hot water is provided therein. It is characterized by being configured to exchange heat with both the bath water in the circulating bathtub.

  According to the seventh aspect of the present invention, for example, the reheating heat exchanger (35) formed in a spiral shape is disposed in the first hot water storage tank (10), thereby exchanging heat with the bath water. Accordingly, the hot water supply water having a substantially intermediate temperature is stored in the first hot water storage tank (10). It is preferable that the intermediate temperature hot water supply water is taken out for the purpose of 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 according to claim 8, 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 first hot water storage tank (10) 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 eighth aspect of the present invention, since the hot water supply water exchanged by the heat exchanger (30) is a substantially hot water supply water by combining with the heating device (60, 70), the intermediate temperature hot water supply is provided. 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 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 FIG. FIG. 1 is a schematic diagram showing an overall configuration of a hot water storage type hot water supply apparatus to which the present invention is applied. The hot water storage type hot water supply apparatus of the present embodiment uses hot water stored in the first and second hot water storage tanks 10 and 11 for hot water supply functions to a kitchen, a washroom, a bathroom, etc., and the stored hot water for hot water supply. Is used for the heating function by heating the secondary fluid.

  First, as shown in FIG. 1, the hot water supply function includes two first and second hot water storage tanks 10 and 11 for storing hot water supply water therein, and the lowermost (low temperature) hot water supply water in the second hot water storage tank 11. A fluid heating channel 21 to be sent to the uppermost part in the hot water storage tank 10, a heat pump unit 20 which is a heating means for heating hot water flowing through the fluid heating channel 21, and tap water on the second hot water tank 11 side. Operation of the hot water supply system, a hot water supply pipe 12 for deriving hot water in the first and second hot water storage tanks 10 and 11, a medium temperature discharge pipe 13 and hot water supply pipes 14 and 15. It is comprised from the control apparatus (The hot water supply control part 41, the heat-source control part 42) to control.

  The heating function is provided adjacent to the first circulation part 30a through which the hot water supply water in the first hot water storage tank 10 circulates and the second circulation part 30b through which the secondary side fluid circulates, and the hot water supply water and the secondary side The heating heat exchanger 30 is a heat exchanger that is configured to be opposed to the fluid and exchanges heat between them, and hot water in the first hot water storage tank 10 is 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 first hot water storage tank 10, 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.

  Next, the components constituting the hot water supply function will be described more specifically. The first and second hot water storage tanks 10 and 11 of the present embodiment are obtained by connecting two vertically long tanks in series. The lowermost part 10 c of the first hot water storage tank 10 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 temperature information detected by the hot water thermistors 52 and 53, the water supply thermistor 51, and hot water storage thermistors 55a and 55b described later. Controlled based on 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 55b (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 55b (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.

  Further, a plurality of hot water storage thermistors 55a and 55b, which are water temperature sensors for detecting the amount of hot water for storing hot water or the temperature of the hot water, are vertically arranged on the outer wall surfaces of the hot water storage tanks 10 and 11. The temperature information at each water level of the hot water supply water filled in the hot water storage tanks 10 and 11 is output to the hot water supply control unit 41 to be described later. .

  Therefore, the hot water supply control unit 41 is heated up in the upper part of the first hot water storage tank 10 and in the lower part of the hot water storage tanks 10 and 11 based on the temperature information from the plurality of hot water storage thermistors 55a and 55b. The boundary position with the previous low-temperature hot water supply water can be detected, and the hot water temperature of the hot water supply at each water level can be detected.

  Of the plurality of hot water storage thermistors 55a and 55b, the hot water storage thermistor 55a provided at the uppermost part in the first hot water storage tank 10 has a function of detecting the temperature of hot water discharged from the hot water supply water.

  Here, the structure which becomes the principal part of this invention is demonstrated. In the present embodiment, a switching valve 25 that switches the flow direction is provided in the middle of the communication pipe 19 that communicates the first hot water storage tank 10 and the second hot water storage tank 11.

  When the temperature of the upper hot water storage in the first hot water storage tank 10 is lower than the upper hot water storage temperature in the second hot water storage tank 11, the switching valve 25 supplies the hot water for hot water stored in the second hot water storage tank 11 to the first. The hot water supply water in the second hot water storage tank 11 is replaced with the hot water for hot water supply in the upper part of the first hot water storage tank 10 by being introduced at the top of the hot water storage tank 10.

  More specifically, one of the switching valves 25 in the vertical direction is connected so as to communicate with the uppermost part 11 c of the second hot water storage tank 11, and the other in the vertical direction is communicated with the lowermost part 10 c of the first hot water storage tank 10. Is connected to the upper inlet 11e in the second hot water storage tank 11, and the other in the horizontal direction is connected to the uppermost inlet 10f in the first hot water tank 10. So connected.

  Reference numeral 22 shown in the figure is a first introduction pipe for guiding medium temperature hot water supply water in the first hot water storage tank 10 into the second hot water storage tank 11, and reference numeral 23 shown in the figure is the inside of the second hot water storage tank 11. This is a second introduction pipe for guiding the hot water for hot water to the uppermost part 10 f in the first hot water storage tank 10.

  Furthermore, 24 shown in the figure is a third circulation pump, which is a pump that operates when the switching valve 25 is switched to the circulation state. Further, reference numeral 26 shown in the drawing is a check valve, which is a valve that prevents high-temperature hot water supply water in the first hot water storage tank 10 from flowing to the switching valve 25 side by convection.

  And the switching valve 25 and the 3rd circulation pump 24 are electrically connected to the hot water supply control part 41 mentioned later, and are controlled based on the temperature information detected by the hot water storage thermistors 55a and 55b mentioned above. Incidentally, the switching valve 25 is controlled so as to be in a circulating state when the upper hot water storage temperature in the first hot water storage tank 10 is lower than the upper hot water storage temperature in the second hot water storage tank 11. As shown, the lowermost part 10c of the first hot water storage tank 10 and the uppermost part 11c of the second hot water storage tank 11 communicate with each other in a normal state.

  When in a circulating state, the lowermost part 10c of the first hot water storage tank 10 communicates with the upper inlet 11e in the second hot water tank 11, and the uppermost inlet 10f in the first hot water tank 10 The flow direction is switched so that the uppermost part 11c of the second hot water storage tank 11 communicates.

  Then, by operating the third circulation pump 24, the medium temperature hot water supply water in the first hot water storage tank 10 is pumped upward in the second hot water storage tank 11, and stored at the high temperature in the second hot water storage tank 11. The hot water supply water is pumped to the uppermost part 10 f in the first tank 10.

  As a result, the hot water supply water in the second hot water storage tank 11 and the medium temperature hot water supply water in the first hot water storage tank 10 are interchanged. Accordingly, hot water for hot water supply is stored above the first hot water storage tank 10.

  Next, the heat pump unit 20 that heats the hot water supply water in the first and second hot water storage tanks 10 and 11 uses, for example, carbon dioxide 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. A supercritical heat pump cycle is used.

  As is well known, this heat pump cycle includes refrigeration cycle functional parts such as a compressor, a heat exchanger for heating, 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 (not shown) 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.

  In addition, a heating fluid passage (not shown) of a heating heat exchanger (not shown) is connected to the first and second hot water storage tanks 10 and 11 via the fluid heating channel 21 described above, and is electrically driven (not shown). By operating the pump, hot water supply water in the first and second hot water storage tanks 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 for hot water in the first hot water storage tank 10 to the first circulation part 30a of the heat exchanger 30 for heating. , 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 heating heat exchanger 30 into the first hot water storage tank 10, and includes an outgoing pipe 33, a return pipe 34, And a first circulation pump 38.

  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 for the hot water in the 1st hot water storage tank 10 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 the thermistors 51 to 53, 55a, 55b, 56, temperature information from each flow counter 54, operation signals from operation switches provided on an operation panel (not shown), etc. The primary side circulation circuit 31 and the secondary side circulation circuit 32 are configured to control various actuators.

  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 the heat source control unit 42, a hot water storage thermistor (uppermost part) 55a for detecting the temperature of the hot water supply water after heating in order to keep the hot water temperature of the hot water supply water heated 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 in the vertical direction of the second hot water storage tank 11 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 second hot water storage tank 11. Furthermore, although the intermediate temperature takeout 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 as shown in FIG. 2.

  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 first and second 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 first and second hot water storage tanks 10 and 11 is used for hot water supply to the kitchen, washroom, bathroom, etc., and the stored hot hot water is used as a heat source. The side fluid is heated and used for heating by the floor heating unit 60 and the heating unit 70.

  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 first hot water storage tank 10.

  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 for hot water exchanged by the heating heat exchanger 30 by the secondary fluid flowing through the second circulation part 30b is returned into the first hot water storage tank 10. Moreover, the hot water storage temperature in the 1st hot water storage tank 10 falls with the output of the heat exchanger 30 for heating. As described above, when a large amount of hot water for hot water is stored in the first hot water storage tank 10, the hot water supply water layer moves upward in the first hot water storage tank 10 to cause hot water shortage at an early stage. There is a problem that, as the hot water storage temperature before heating is higher during hot water driving operation, the higher the high pressure pressure, the lower the operating efficiency.

  Therefore, in the present embodiment, when the hot water storage temperature in the first hot water storage tank 10 is lower than the hot water storage temperature in the second hot water storage tank 11, the flow direction of the switching valve 25 is switched to the circulating state. By controlling the third circulation pump 24 to operate, the medium-temperature hot water supply water in the first hot water storage tank 10 is pumped upward in the second hot water storage tank 11, and is moved upward in the second hot water storage tank 11. The stored hot water for hot water supply is pumped to the uppermost part 10 f in the first tank 10.

  Thus, hot water supply water is always stored above the first tank 10 so that hot water does not run out at an early stage. By the way, when the hot water for hot water in the second hot water storage tank 11 communicating with the first hot water storage tank 10 through the communication pipe 19 is not replaced as described above, the hot water for medium temperature in the first hot water storage tank 10 is used. Since the hot water for the hot water supply on the second hot water storage tank 11 side is relieved by the water, it is possible to prevent the medium temperature hot water supply water from increasing.

  Further, in the present embodiment, control is performed so that the substantially intermediate temperature hot water returned to the second hot water storage tank 11 during hot water use is taken out from the intermediate temperature take-out pipe 13. Specifically, when a hot water tap or a shower tap (not shown) is opened and flow rate information is output to the hot water supply control unit 41 by the flow rate counter 54, the high / medium hot water mixing valve 17 and the hot water mixing valve 18 are controlled. Adjust the temperature of the hot water supply water.

  More specifically, when the hot water storage temperature in the first and second hot water storage tanks 10 and 11 detected by the hot water storage thermistors 55a and 55b in the high / medium hot water mixing valve 17 is equal to or higher than a predetermined temperature (for example, 30 ° C.), A predetermined temperature (for example, set) is mixed from both the medium temperature heat storage fluid taken out from the medium temperature takeout pipe 13 or the medium temperature hot water supply water taken out from the medium temperature takeout pipe 13 and the hot water supply water taken out from the high temperature takeout pipe 12. The hot water supply water having a temperature higher than the temperature + 5 ° C. 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 second hot water storage tank 11 from the water-supply pipe 16. For example, immediately after the heat pump unit 20 is boiled or when the floor heating unit 60 or the heating unit 70 is not operated, the hot water supply water in the first and second hot water storage tanks 10 and 11 detected by the hot water storage thermistors 55a and 55b is used. Sometimes the hot water temperature is lower than a predetermined temperature (for example, 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 fluid to be heated by the heat exchanger 30 for heating, and the hot water for hot water having a low intermediate temperature is stored in the first hot water storage tank 10. Although it is returned and increased, the configuration is such that the hot hot water supply water in the second hot water storage tank 11 is pumped to the top of the first hot water storage tank 10, so that the hot hot water supply water in the second hot water storage tank 11 is changed to the first. The hot water can be used for hot water supply without being relaxed by the hot water for medium temperature hot water supply on the 1 hot water storage tank 10 side.

  In addition, early hot water shortage on the first hot water storage tank 10 side can be prevented, 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 heat pump unit 20 during the boiling operation.

  Further, a high / middle temperature water mixing valve 17 is provided to mix hot hot water and intermediate temperature hot water and adjust to a predetermined temperature hot water, and the high temperature hot water in the first hot water storage tank 10 flows into one side. And by having comprised so that the intermediate temperature hot water supply water in the 1st or 2nd hot water storage tanks 10 and 11 may be flowed into the other side, the intermediate temperature hot water supply water can be actively consumed for the purpose of hot water supply.

  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.

  More specifically, the high-temperature hot-water supply pipe 12 for taking out hot hot-water supply water, and the first or second hot water storage tank 10 is provided with an intermediate-temperature take-out pipe 13 for taking out hot water for hot-water supply. The one side is connected to the high temperature take-out pipe 12 and the other side is connected to the medium temperature take-out pipe 13, so that the medium-temperature take-out water of the hot water having a low temperature is exchanged by the heat exchanger 30 for heating. By taking out from 13 and connecting to the other side of the high / medium-temperature water mixing valve 17, the medium-temperature hot water supply water can be actively consumed for the purpose of hot water supply.

  In addition, the medium temperature take-out pipe 13 is provided with a plurality of at least two or more, and is configured to select one of the medium temperature hot water supply water and circulate to the other side of the high and medium temperature water mixing valve 17. The portion where the intermediate temperature hot water supply water is stored is not uniform in the vertical direction of the first and second hot water storage tanks 10 and 11, and therefore, a plurality of intermediate temperature extraction pipes 13 are provided, so that the intermediate temperature hot water supply can be accurately and positively provided. Water can be actively removed.

  The heat pump unit 20 is a supercritical heat pump in which the high pressure side pressure of the refrigerant becomes equal to or higher than the critical pressure, and heats the hot water in the first and second hot water storage tanks 10 and 11 with the refrigerant whose pressure is increased to the critical pressure or higher. Thus, in the supercritical 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, hot water stored in the first and second 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 stored hot water for hot water is used as a heat source. The secondary fluid is heated and used for the heating function. However, the present invention is not limited to this, and the secondary fluid may be used for a function of chasing bath water in addition to the heating function.

  In this embodiment, the hot water stored in the first and second 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 stored hot water for hot water and this as a heat source, It has a function of chasing hot water in a bathtub and 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. 3, the hot water storage type hot water supply apparatus according to 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. 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 for hot water having substantially the same temperature as the bath water temperature is stored in the first hot water storage tank 10. However, as in the first embodiment, the hot water in the first hot water storage tank 10 is stored. When the upper hot water storage temperature is lower than the upper hot water storage temperature in the second hot water storage tank 11, the flow direction of the switching valve 25 is switched to the circulation state, and the third circulation pump 24 is controlled to operate. Thus, the medium temperature hot water supply water in the first hot water storage tank 10 is pumped upward in the second hot water storage tank 11, and the high temperature hot water supply water stored in the upper portion of the second hot water storage tank 11 is in the first tank 10. It is pumped to the top 10f.

  As a result, hot water for hot water supply is always stored above the first tank 10. At the time of hot water supply, the medium-temperature hot-water supply water stored is actively taken out from the intermediate-temperature take-out pipe 13, whereby low-temperature tap water is introduced from the water supply pipe 16 to the lower part of the second hot water storage tank 11. 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 1st, 2nd hot water storage tanks 10 and 11 can be actively consumed by hot water filling a bathtub. Incidentally, 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, similarly to the first embodiment, the hot water storage temperature in the first and second hot water storage tanks 10 and 11 detected by the hot water storage thermistors 55a and 55b in the high / medium hot water mixing valve 17 is a predetermined temperature (for example, 30 When the temperature is equal to or higher than (° C.), the medium temperature storage fluid extracted from the intermediate temperature extraction pipe 13 or the medium temperature hot water supply water extracted from the intermediate temperature extraction pipe 13 and the hot water supply water extracted from the high temperature extraction pipe 12 are mixed. Thus, the hot water supply water having a temperature equal to or higher than a predetermined temperature (for example, about the set 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 heat-exchanged hot water having a substantially medium temperature having a low hot water temperature is exchanged in the first hot water storage tank. Although the hot water supply water in the second hot water storage tank 11 is pumped to the top of the first hot water storage tank 10, the hot water supply water in the second hot water storage tank 11 is stored in the second hot water storage tank 11. The hot water can be used for hot water supply without being relaxed by the hot water for medium temperature hot water supply on the 1 hot water storage tank 10 side.

  In addition, early hot water shortage on the first hot water storage tank 10 side can be prevented, 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 heat pump unit 20 during the boiling operation.

  Further, by actively consuming hot water for hot water supply and hot water filling, premature hot water shortage can be prevented as in the first embodiment, and low temperature hot water can be sucked in and heated. A decrease in operating efficiency of the heat pump unit 20 during the raising operation can be prevented.

  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 first heat exchanger 30 in the first embodiment is not limited thereto. Alternatively, it may be installed outside the second hot water storage tanks 10 and 11 so as to distribute the bath water to the second circulation part 30b.

(Third embodiment)
In the above embodiment, the communication pipe 19 that communicates with the first and second hot water storage tanks 10 and 11, the switching valve 25 that switches the flow direction, the first introduction pipe 22 and the second introduction pipe that are connected to the switching valve 25. 23 and a third circulation pump 24, and when the upper hot water storage temperature in the first hot water storage tank 10 is lower than the upper hot water storage temperature in the second hot water storage tank 11, the upper portion in the first hot water storage tank 10 is 2 The switching valve 25 and the third circulation pump 24 are controlled so as to replace the hot water supply water in the hot water storage tank 11, but the invention is not limited to this, and an electric pump provided in the heat pump unit 20 (FIG. (Not shown) may be used.

  Specifically, as shown in FIG. 4, a switching valve 25 is provided in the middle of the suction side of the fluid heating channel 21 and in the middle of the communication pipe 19. More specifically, the lowermost part 10c of the first hot water storage tank 10 and the uppermost part 11c of the second hot water storage tank communicate with each other when the switching valve 25 is in a normal state and when the heat pump unit 20 is heated. 2 The bottom 11a of the hot water storage tank 11 and the inlet side of the heat pump unit 20 are arranged to communicate with each other, and the uppermost part 11c of the second hot water storage tank and the inlet side of the heat pump unit 20 communicate with each other in the circulating state. It arrange | positions so that it may do.

  Reference numerals 27 and 28 shown in the figure denote a bypass pipe 27 that communicates the bottom 11a of the second hot water storage tank 11 and the lowermost part 10c of the first hot water storage tank 10, and an open / close valve 28 that opens and closes the bypass pipe 27 is provided. Is provided. The on-off valve 28 is controlled so as to be closed during a normal state and when the heat pump unit 20 is heated up and opened when the heat pump unit 20 is in a circulating state. In addition, the electric pump (not shown) provided in the heat pump unit 20 also operates during the circulation state and during the boiling operation.

  Accordingly, when the upper hot water storage temperature in the first hot water storage tank 10 is lower than the upper hot water storage temperature in the second hot water storage tank 11, the hot water supply water in the second hot water storage tank 11 becomes hot. 2 The uppermost part 11 c of the hot water storage tank 11 → the communication pipe 19 → the switching valve 25 → the suction side of the fluid heating flow path 21 → the heat pump unit 20 → the upper part 10 a of the first hot water storage tank 10.

  On the other hand, medium temperature hot water supply water in the first hot water storage tank 10 is pumped in the order of the lowermost part 10 c of the first hot water storage tank 10 → the bypass pipe 27 → the bottom part 11 a of the second hot water storage tank 11. Therefore, as in the first and second embodiments described above, hot water supply water is always stored above the first tank 10 so that hot water does not run out at an early stage. Furthermore, it is not necessary to provide the third circulation pump 24 by using the electric pump of the heat pump unit 20.

(Other embodiments)
In the above embodiment, 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 in the second embodiment, the hot water supply function is combined with the hot water filling and reheating function. However, the present invention may be applied to a hot water storage type hot water supply apparatus that combines a hot water supply function, a heating function, a hot water filling and a reheating function. Moreover, although the heating function was comprised with the warm air heater, it can apply also to a bathroom dryer and a clothes dryer besides these.

  Furthermore, although the heat pump unit 20 using carbon dioxide as a refrigerant has been described as a heat source device, 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. It is a schematic diagram which shows the whole structure of the hot water storage type water heater in 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st hot water storage tank 11 ... 2nd hot water storage tank 12 ... High temperature extraction piping 13 ... Medium temperature extraction piping 17 ... High / medium temperature water mixing valve (2nd hot water supply temperature control 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)
60 ... Floor heating unit (heating device)
70 ... Heating unit (heating device)

Claims (9)

A first hot water storage tank (10) for storing hot water supply water therein;
A second hot water storage tank (11) that communicates the upper part (11C) with the lower part (10C) of the first hot water storage tank (10) and stores hot water from the water supply pipe (16) connected to the lower part (11b). )When,
Heating means (20 ) for guiding the low temperature hot water stored in the second hot water storage tank (11), exchanging heat with the high temperature refrigerant, boiling it, and pumping it to the upper part (10a) of the first hot water storage tank (10) )When,
The hot water for hot water stored in the first hot water storage tank (10) and the fluid to be heated are subjected to heat exchange, and the hot water for hot water stored in the first hot water storage tank (10) is used for medium temperature hot water. In a hot water storage type hot water supply device comprising a heat exchanger (30, 35) for converting into
When the hot water storage temperature in the first hot water storage tank (10) decreases due to the output of the heat exchanger (30, 35), the hot hot water supply water in the second hot water storage tank (11) and the first hot water storage tank (10) Provide a means for replacing the medium temperature hot water supply water in the inside ,
The means for exchanging is arranged such that when the upper hot water storage temperature in the first hot water storage tank (10) is lower than the upper hot water storage temperature in the second hot water storage tank (11), the upper portion of the second hot water storage tank (11). (11C) hot hot water supply water is allowed to flow into the upper part (10f) of the first hot water storage tank (10), and intermediate hot water supply water in the first hot water storage tank (10) is supplied into the second hot water storage tank (11). Consisting of means to flow into
An intermediate temperature extraction pipe (13) for connecting hot water supply pipes (14, 15) for guiding hot water supply water in the first hot water storage tank (10) to a hot water outlet terminal is connected to an intermediate portion of the first hot water storage tank (10). hot water storage type hot water supply apparatus according to claim. A second hot water supply temperature adjusting means (17) for mixing hot water hot water flowing into one side and medium hot water hot water flowing into the other side to adjust to a predetermined temperature hot water;
First hot water temperature adjusting means for adjusting a desired hot water temperature by mixing hot water for hot water having a predetermined temperature adjusted by the second hot water temperature adjusting means (17) flowing into one side and tap water flowing into the other side. (18, 18a) are provided,
The second hot water supply temperature adjusting means (17) allows hot water for hot water in the first hot water storage tank (10) to flow into one side, and an intermediate temperature hot water supply in the first hot water storage tank (10) to the other side. The hot water storage type hot water supply apparatus according to claim 1 , wherein water is supplied. The second hot water supply temperature adjusting means (17) causes the intermediate temperature hot water supply water in the first hot water storage tank (10) and the intermediate temperature hot water supply water in the second hot water storage tank (11) to flow into the other side. hot water storage type water heater according to claim 1 or claim 2, characterized in. The first hot water storage tank (10) is provided with a high temperature extraction pipe (12) for taking out hot hot water supply water, and the first hot water storage tank (10) and the second hot water storage tank (11) have medium temperature hot water supply water. An intermediate temperature extraction pipe (13) is provided for extracting
The second hot water supply temperature adjusting means (17) is characterized in that the one side is connected to the high temperature extraction pipe (12) and the other side is connected to the medium temperature extraction pipe (13). The hot water storage type hot water supply apparatus described in 1. A plurality of the medium temperature take-out pipes (13) are provided in the vertical direction, and one of the medium temperature hot water supply water is selected and distributed to the other side of the second hot water supply temperature adjusting means (17). The hot water storage type hot water supply apparatus according to claim 4, wherein   The heat exchanger (30, 35) is a reheating heat exchanger (35) for exchanging heat between hot water in the first hot water storage tank (10) and bath water in the bathtub. The hot water storage type hot water supply apparatus according to any one of claims 1 to 5.   The reheating heat exchanger (35) is disposed in a portion of the first hot water storage tank (10) where hot water for hot water is stored, and the hot water for hot water and bath water in a bathtub that circulates inside. The hot water storage type hot water supply apparatus according to claim 6, wherein both are configured to exchange heat.   The 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 first hot water storage tank (10) 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 apparatus according to any one of claims 1 to 7, wherein the hot water storage type hot water supply apparatus is provided.   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 the refrigerant in the first and second hot water storage tanks (10, 11) is increased by 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, wherein the hot water supply water is heated.

Images