JP2005274132A - Hot-water storage type water heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot-water storage type water heating system capable of supplying hot water of respectively set temperature from a plurality of hot-water supplying terminals and capable of effectively using middle-temperature water inside a hot-water storage tank. <P>SOLUTION: This hot-water storage tank type water heating system is provided with a middle-temperature hot-water supplying pipe 29 for letting the middle-temperature hot-water inside the hot-water storage tank 2 flow, a middle-temperature water mixing valve 30 for mixing the high-temperature water from a hot-water supplying pipe 8 with the middle-temperature water from the middle-temperature hot water supplying pipe 29 to any predetermined temperature, a first mixing valve 37 for mixing the hot water mixed by the middle-temperature water mixing valve 30 with the low-temperature water from a first bypass pipe 38 to a first supplying hot-water set temperature to supply it from a first hot-temperature supplying terminal, a second mixing valve 41 for mixing the hot-water mixed by the middle-temperature water mixing valve 30 with the low-temperature water from a second bypass pipe 43 to a second supplying hot-water set temperature to supply it from a second hot-water supplying terminal. In the case of supplying hot-water from one hot-water supplying terminal, any predetermined temperature to be set by the middle-temperature water mixing valve 30 is a value higher by a certain temperature than the set temperature of the hot-water to be supplied from this one hot-water supplying terminal, and in the case of supplying hot-water from both the hot-water supplying terminals at the same time, it is set at a value higher by a certain temperature than the higher temperature of both the hot-water. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water storage type hot water supply apparatus including a heat exchanger that uses hot water in a hot water storage tank as a heat source.

  Conventionally, in this type, as disclosed in Japanese Patent Application No. 2002-39478 filed by the applicant of the present application, a hot water stored in a hot water storage tank is taken out and used as a heat source for heating and bathing. Some of the hot water whose temperature has been lowered by heat exchange is returned to the hot water storage tank, and the intermediate hot water is taken out from the intermediate portion of the hot water storage tank and used for hot water supply. And this middle temperature water merged with the high temperature water from the hot water storage tank upper part, was mixed with the temperature more than the hot water supply preset temperature, and was supplied.

Although the applicant of the present application cannot find a known publication related to such a conventional hot water storage type hot water supply apparatus, it is assumed that heating is performed using high-temperature water stored in a hot water storage tank as a heat source. Is mentioned.
Japanese Patent No. 2666337 (FIG. 1)

  However, this conventional one is branched and connected to a plurality of hot water supply ends on the downstream side of the hot water mixing valve, and a hot water supply set temperature is arbitrarily set at each hot water supply end. When there is a hot water supply request at a set temperature, only one hot water set temperature can be supplied.

  Therefore, in order to solve these problems, the present invention provides a hot water storage device in which a water supply pipe is connected to the lower end portion and a hot water discharge pipe for discharging the hot water stored in the hot water is connected to the upper end portion. A tank, heating means for heating hot water in the hot water storage tank to a high temperature, a hot water outlet pipe connected to a position lower than the hot water discharge pipe of the hot water storage tank, and medium hot water flowing out from the hot water storage tank; An intermediate temperature water mixing valve for mixing hot water from the outlet pipe and intermediate temperature water from the intermediate temperature water outlet pipe to an arbitrary predetermined temperature, hot water mixed by the intermediate temperature water mixing valve, and a branch branched from the water supply pipe A first mixing valve for mixing low temperature water from one bypass pipe to an arbitrary first hot water supply set temperature and supplying hot water from a first hot water supply end, hot water mixed by the intermediate hot water mixing valve, and the water supply pipe are branched. The cold water from the second bypass pipe A second mixing valve that mixes with a predetermined second hot-water supply temperature and supplies hot water from a second hot-water supply end, and an arbitrary predetermined temperature mixed by the intermediate-temperature water mixing valve is set to the first hot-water supply set temperature and the first The temperature was set to a constant temperature higher than the higher one of the two hot water set temperatures.

  According to a second aspect of the present invention, there is provided a hot water storage tank having a hot water supply pipe connected to the upper end portion of the hot water storage pipe connected to the lower end portion and a hot water discharge pipe for discharging the hot water stored in the hot water, and the hot water in the hot water storage tank is heated A heating means for heating, a medium temperature hot water discharge pipe connected to a position lower than the hot water discharge pipe of the hot water storage tank, and for causing the intermediate hot water to flow out of the hot water storage tank; high temperature water from the hot water discharge pipe; An intermediate temperature water mixing valve for mixing intermediate temperature water from the pipe to an arbitrary predetermined temperature, hot water mixed by the intermediate temperature water mixing valve, and low temperature water from the first bypass pipe branched from the water supply pipe A first mixing valve that mixes at a hot water supply set temperature and supplies hot water from the first hot water supply end, hot water mixed by the intermediate hot water mixing valve, and low-temperature water from the second bypass pipe branched from the water supply pipe The second hot water mixed with the second hot water set temperature A second mixing valve for supplying hot water from the hot water mixing valve, and in the case of hot water supply from one hot water supply end, the predetermined temperature mixed by the intermediate temperature water mixing valve is set to a temperature that is a constant temperature higher than the one hot water set temperature, In the case of simultaneous hot water supply from the hot water supply end, the temperature is set to a constant temperature higher than the higher one of the first hot water set temperature and the second hot water set temperature.

  According to claim 1 of the present invention, hot water can be supplied using as much hot water as possible according to any hot water set temperature at that time, and there is a request for simultaneous hot water supply from a plurality of hot water supply ends. Even so, hot water at each set temperature can be supplied simultaneously while effectively using medium-temperature water, and use of high-temperature water can be suppressed.

  According to claim 2, hot water can be supplied using as much hot water as possible according to any hot water set temperature at that time, and the hot water set temperature on the side where hot water is not supplied is high. Even so, any given temperature that is mixed by the intermediate hot water mixing valve is set to a temperature that is a certain temperature higher than the hot water supply set temperature on the side where the hot water supply temperature is actually supplied. Hot water can be used in many ways, and even when there is a need for simultaneous hot water supply from multiple hot water supply ends, hot water at each set temperature can be supplied at the same time while effectively using medium-temperature water. It is possible to suppress wasteful use of water.

  Next, a hot water storage type hot water supply apparatus according to an embodiment of the present invention will be described with reference to FIGS. 2 to 10, hatched hatched lines in the hot water storage tank indicate low temperature water, double hatched lines indicate medium hot water, triple hatched lines indicate hot water, and arrows indicate the flow direction of hot water.

  This hot water storage type hot water supply device boils and stores hot water in the midnight hours when the unit price of contracted power by time is low, and uses the hot water stored for hot water supply. 1 is a hot water storage tank 2 for storing hot water. 3 is a heat pump unit for heating hot water in the hot water storage tank, 4 is a hot water tap as a first hot water supply end provided in a kitchen or a washroom, and 5 is provided in the vicinity of the hot water tap 4. A hot water remote controller, 6 is a bathtub, and 7 is a bath remote controller provided in the bathroom.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 8 connected to the upper end, a water supply pipe 9 connected to the lower end, a heat pump forward pipe 10 connected to the lower part, and a heat pump return pipe 11 connected to the upper part. The hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 10 by the unit 3 is boiled and returned to the hot water storage tank 2 from the heat pump return pipe 11 to be stored, and hot water in the hot water storage tank 2 is pushed up by the water supply from the water supply pipe 9. The hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 8 to supply hot water.

  The heat pump unit 3 includes a compressor 12, a refrigerant-water heat exchanger 13 as a condenser, an electronic expansion valve 14, a forced air-cooled evaporator 15, a heat pump circuit 16 as a heating means, and a hot water storage tank 2. A heat pump circulating pump 17 for circulating the hot water in the refrigerant to the refrigerant-water heat exchanger 13 via the heat pump forward pipe 10 and the heat pump return pipe 11, and a heat pump controller 18 for controlling the driving of the heat pump. In the circuit 16, carbon dioxide is used as a refrigerant to constitute a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, low-temperature water can be boiled up to a high temperature of about 90 ° C. without an electric heater.

  Here, the refrigerant-water heat exchanger 13 employs a counter flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water face each other, and in the supercritical heat pump cycle, the refrigerant is exchanged during heat exchange. Since the water to be heated can be efficiently heated to a high temperature because it is condensed in a supercritical state, the temperature difference between the refrigerant-water heat exchanger 13 inlet temperature and the refrigerant outlet temperature is made constant. By controlling the pressure reducer 14 or the compressor 12, the COP (energy consumption efficiency) is 3.3 when the inlet temperature of the refrigerant-water heat exchanger 13 to be heated is a low temperature of about 5 to 20 ° C. It is possible to heat the water to be heated in a very good state of 0 or more.

  Reference numeral 19 denotes a heat exchanger for heating the hot water in the bathtub 6, and on the primary side thereof, there are a high temperature water discharge pipe 20 connected to the upper part of the hot water storage tank 2 and an intermediate hot water return pipe 21 connected to the lower part of the hot water storage tank 2. Is connected to form a heat exchanger circuit 22, and high-temperature water taken out from the hot water storage tank 2 is circulated to the heat exchanger 19 by operating a heat exchanger pump 23 provided in the middle hot water return pipe 21 to exchange heat. Accordingly, the medium-temperature water whose temperature has been lowered by the above is returned to the hot water storage tank 2 again.

  On the secondary side of the heat exchanger 19, a bath circulation circuit 26 composed of a bath pipe 24 and a bath return pipe 25 is connected so as to be able to circulate hot water in the bathtub 6, and provided in the middle of the bath return pipe 25. The hot water in the bathtub 6 is circulated to the heat exchanger 19 by the operation of the bath circulation pump 27, and is heated by the high temperature water on the primary side, so that the hot water in the bathtub 6 is kept warm or chased. Reference numeral 28 denotes a bath temperature sensor for detecting the temperature of hot water in the bathtub 6 circulating through the bath return pipe 25.

  Next, 29 is an intermediate temperature hot water discharge pipe connected to an intermediate position of the hot water storage tank 2 which is higher than the intermediate hot water return pipe 21 and lower than the hot water discharge pipe 8, and exchanges heat with the secondary side in the heat exchanger 19. The lowered medium temperature water is discharged from the hot water storage tank 2.

  Reference numeral 30 denotes an intermediate temperature water mixing valve provided downstream of the intermediate temperature hot water discharge pipe 29. The intermediate temperature water mixing valve near the intermediate position of the hot water storage tank 2 and hot water from the hot water discharge pipe 8 connected to the upper end of the hot water storage tank 2 are The hot water temperature detected by the hot water temperature sensor 32 provided on the downstream first hot water pipe 31 is the hot water set temperature (first hot water set temperature) or the bath set temperature (second temperature) set by the user using the hot water remote controller 5 or the bath remote controller 7. The mixing ratio is controlled to be an arbitrary predetermined temperature that is a constant temperature (for example, 5 ° C.) higher than the (hot water supply set temperature).

  Here, the intermediate hot water outlet pipe 29 is connected via a hot water outlet switching valve 33 to a first intermediate hot water outlet 34 and a second intermediate hot water outlet 35 provided above and below an intermediate position of the hot water storage tank 2. Middle hot water stored near the intermediate position of the hot water storage tank 2 from one of the hot water outlets is discharged toward the intermediate hot water mixing valve 30, and the hot water storage tank slightly below the first intermediate warm water hot water outlet 34 below. The hot water outlet switching valve 33 is switched according to the temperature detected by the medium hot water temperature sensor 36 provided on the two side surfaces.

  Next, 37 is a hot water supply mixing valve (first mixing valve) constituted by an electric mixing valve that mixes hot water from the first hot water discharge pipe 31 and low temperature water from the first bypass pipe 38 branched from the water supply pipe 9. The mixing ratio is controlled so that the hot water temperature detected by the hot water temperature sensor 40 provided in the downstream hot water supply pipe 39 becomes the hot water supply set temperature set by the user using the hot water remote controller 5 or the bath remote controller 7.

  Reference numeral 41 denotes an electric mixing valve that mixes hot water from the second hot water pipe 42 branched from the first hot water pipe 31 and low-temperature water from the second bypass pipe 43 branched from the water supply pipe 9. A hot water temperature detected by a hot water temperature sensor 45 provided in a hot water hot water pipe 44 as a second hot water supply end, which is a hot water mixing valve (second mixing valve) downstream of the hot water circulation circuit 26. The mixing ratio is controlled so that the remote controller 7 sets the full set temperature set by the user.

  The hot water filling pipe 44 has a hot water filling valve 46 for starting / stopping hot water filling to the bathtub 6 via the bath circulation circuit 26 and a bath flow rate counter 47 for counting the amount of hot water filling to the bathtub 6. It is provided.

  Next, a plurality of hot water storage temperature sensors 48 are arranged in the vertical direction of the hot water storage tank 2, and the amount of heat remaining in the hot water storage tank 2 is detected based on temperature information detected by the hot water storage temperature sensor 48. And the temperature distribution of the up-down direction in the hot water storage tank 2 is detected.

  The hot water remote controller 5 and the bath remote controller 7 include hot water temperature setting switches 49 and 50 for setting a hot water set temperature (first hot water set temperature) and a bath temperature setting switch for setting a bath set temperature (second hot water set temperature). 51 and 52 are provided, respectively, and hot water of a bath set temperature (second hot water supply set temperature) is supplied to the bathtub 6 by a hot water amount set by a hot water amount setting switch (not shown) of the remote controller 7. Automatic bath switches 53 and 54 that are stretched and kept warm for a predetermined time are provided.

  Reference numeral 55 denotes a hot water supply control unit having a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls the drive of each actuator. The hot water remote controller 5 and the bath remote controller 7 are connected to the hot water controller 55 by radio or wire so that the user can set an arbitrary hot water set temperature (first hot water set temperature) and bath hot set temperature (second hot water set temperature). It is what you are doing.

  Note that 56 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 57 is a water supply temperature sensor for detecting the temperature of the water supply, 58 is a pressure reducing valve for reducing the pressure of the water supply, and 59 is for counting the amount of hot water supplied. This is a hot water flow rate counter.

Next, the operation of this embodiment will be described.
First, the boiling operation shown in FIG. 2 will be described. When the hot water storage temperature sensor 48 detects that the required amount of heat does not remain in the hot water storage tank 2 in the midnight electric power time zone, the hot water supply control section 55 A boiling start command is issued to the control unit 18. Upon receiving the command, the heat pump controller 18 starts driving the heat pump circulation pump 17 after starting the compressor 12, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 10 connected to the lower part of the hot water storage tank 2 as a refrigerant. -Heated to a high temperature of about 70 to 90 ° C by the water heat exchanger 13, returned to the hot water storage tank 2 from the heat pump return pipe 11 connected to the upper part of the hot water storage tank 2, and sequentially stacked from the upper part of the hot water storage tank 2 Store hot water. When the hot water storage temperature sensor 48 detects that the necessary amount of heat has been stored, the hot water supply control unit 55 issues a boiling stop command to the heat pump control unit 18, and the heat pump control unit 18 stops the compressor 12 and heat pump circulation. The pump 17 is also stopped and the boiling operation is finished.

  Next, the hot water supply operation shown in FIG. 3 will be described. When the hot water tap 4 is opened, the water supplied from the water supply pipe 9 flows into the hot water storage tank 2. At this time, since the boiled high-temperature water is stored at the position of the medium temperature water temperature sensor 36 in the hot water storage tank 2, the medium temperature water temperature sensor 36 detects a temperature equal to or higher than a predetermined value, and the hot water supply control unit 55. As a result, the intermediate warm water switching valve 33 is switched to the lower first intermediate warm water outlet 34, and hot water is pushed out from the first intermediate warm water outlet 34 to the intermediate warm water mixing valve 30 through the intermediate warm water outlet pipe 29. . In the hot water storage tank 2, high temperature water is stored in the upper part and low temperature water is stored in the lower part. However, a specific gravity difference is generated due to the temperature difference, and a high temperature water having a low specific gravity is formed on the upper part by forming a temperature boundary layer. Since low-temperature water with a high specific gravity is located at the lower part, they do not mix with each other.

  Here, the hot water supply control unit 55 mixes hot water from the hot water tap pipe 29 and hot water from the hot water pipe 8 and sets the hot water set temperature (first temperature) set by the hot water remote controller 5 or the bath remote controller 7 at the hot water mixing valve 30. The intermediate temperature water mixing valve 30 is adjusted to an appropriate ratio so that the temperature is higher than a certain temperature by 1 hot water supply set temperature). Here, since the hot water flowing in from the intermediate temperature hot water outlet pipe 29 is hot and higher than the hot water supply set temperature (first hot water supply set temperature), the outlet hot water pipe 8 side of the intermediate temperature water mixing valve 30 is closed.

  And the hot water which flowed out from the intermediate temperature water mixing valve 30 flows into the hot water supply mixing valve (first mixing valve) 36 through the first hot water discharge pipe 31, and is mixed with the low temperature water from the first bypass pipe 38, and the hot water supply control section. 55 adjusts the mixing ratio of the hot water supply mixing valve (first mixing valve) 36, and hot water at a hot water supply set temperature (first hot water set temperature) is supplied from the hot water tap 4. Then, the hot water supply is completed by closing the hot water tap 4.

  Here, when the intermediate hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 switches the hot water outlet switching valve 33 to the upper second intermediate hot water hot water outlet 35 side as shown in FIG. Hot water is discharged from the intermediate temperature water outlet 35. Therefore, when high temperature water or medium temperature water is stored near the lower first intermediate hot water outlet 34, hot water is discharged from the first intermediate hot water outlet 34, and the water supply pipe 9 is provided near the first intermediate hot water outlet 34. When the low-temperature water from the hot water is stored, the hot water is discharged from the second intermediate hot water outlet 35, and the hot water in the hot water storage tank 2 can be used for hot water supply without being left over.

  Further, since the intermediate warm water mixing valve 30 supplies hot water having a temperature higher than a predetermined hot water supply temperature (first hot water supply set temperature) to the first hot water discharge pipe 31, the first intermediate warm water hot water outlet 34 is provided. When the temperature of the hot water discharged from the second intermediate hot water outlet 35 is lower than the hot water supply set temperature (first hot water supply set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is controlled by the hot water supply control unit 55 as shown in FIG. Is adjusted so that hot water having a constant temperature higher than the hot water supply set temperature (first hot water set temperature) is supplied to the first hot water discharge pipe 31 using the high temperature water from the hot water discharge pipe 8, and the intermediate position of the hot water storage tank 2 It is possible to prioritize the hot water from the hot water, minimize the use of hot water stored in the upper part of the hot water storage tank 2, and secure more hot water as a heat source.

  Next, the hot water filling operation to the bathtub 6 shown in FIG. 6 will be described. When any of the hot water automatic switches 53 and 54 of the hot water remote controller 5 or the bath remote controller 7 is operated, the hot water controller 55 makes the hot water valve 46. Open the valve. Then, the water supply from the water supply pipe 9 flows into the hot water storage tank 2. At this time, since the boiled high-temperature water is stored at the position of the medium temperature water temperature sensor 36 in the hot water storage tank 2, the medium temperature water temperature sensor 36 detects a temperature equal to or higher than a predetermined value, and the hot water supply control unit 55. As a result, the intermediate warm water switching valve 33 is switched to the lower first intermediate warm water outlet 34, and hot water is pushed out from the first intermediate warm water outlet 34 to the intermediate warm water mixing valve 30 through the intermediate warm water outlet pipe 29. .

  When the hot water supply control unit 55 receives inputs from the automatic bath switches 53 and 54, the hot water from the intermediate hot water hot water outlet 29 and hot water from the hot water outlet 8 are mixed and the hot water remote control 5 The intermediate warm water mixing valve 30 is adjusted to an appropriate ratio so that the temperature is higher than a predetermined temperature by the bath remote controller 7 (second hot water set temperature). Here, since the hot water flowing from the intermediate temperature hot water outlet pipe 29 is at a high temperature and higher than the bath set temperature (second hot water supply temperature), the outlet hot water pipe 8 side of the intermediate temperature water mixing valve 30 is closed.

  The hot water flowing out from the intermediate hot water mixing valve 30 is discharged to the second hot water discharge pipe 42 via the first hot water discharge pipe 31. And the high temperature water from the 2nd tap pipe 42 flows into the bath mixing valve (2nd mixing valve) 41, is mixed with the low temperature water from the 2nd bypass pipe 43, and the hot water supply control part 55 carries out the bath mixing valve (2nd mixing valve). The mixing ratio of the valve (41) is adjusted, and hot water at the bath setting temperature (second hot water supply setting temperature) is filled from the hot water filling pipe 44 to the bathtub 6 via the bath circulation circuit 26. Here, when the medium hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 moves the hot water outlet switching valve 33 to the upper side of the second intermediate hot water hot water outlet 34 as in the case of the hot water supply operation described in FIG. The hot water is discharged from the second intermediate hot water outlet 34.

  Then, when a bath flow counter 47 provided in the middle of the hot water filling pipe 44 counts a predetermined hot water filling amount, the hot water supply control unit 55 closes the hot water filling valve 46 and ends the hot water filling operation. Is set to a temperature that is higher by a certain temperature than the hot water supply set temperature (first hot water supply set temperature).

  Next, the warming operation or reheating operation of the bath shown in FIG. 7 will be described. Following the hot water filling operation to the bathtub 6, the hot water supply control unit 55 drives the bath circulation pump 27 at regular intervals, and the bath 6 The hot water temperature inside is detected by the bath temperature sensor 28. When the temperature detected by the bath temperature sensor 28 is lower than the bath set temperature (second hot water set temperature) by a predetermined value or more, the hot water control section 55 starts driving the heat exchange circulation pump 23 and the bath circulation pump 26. The high temperature water taken out from the high temperature water discharge pipe 20 is caused to flow into the heat exchanger 19 to exchange heat with the secondary side bath water, and the warming operation or reheating operation of the bath is performed. Then, the intermediate temperature water whose temperature has decreased due to the heat exchange returns to the lower part of the hot water storage tank 2 via the intermediate temperature water return pipe 21 and the hot water is stored in such a way as to push up the boundary surface between the high temperature water and the intermediate temperature water. Is. In the hot water storage tank 2, high temperature water is stored in the upper part, medium temperature water is stored in the middle part, and low temperature water is stored in the lower part. If the temperature difference is about 20 ° C, a specific gravity difference occurs and a temperature boundary layer is formed. Since the high-temperature water having a low specific gravity is located at the upper part, the intermediate intermediate water is located at the intermediate part, and the low-temperature water having a high specific gravity is located at the lower part, they are not mixed with each other.

  On the secondary side, the bathtub water heated by the heat exchanger 19 returns to the bathtub 6 to raise the temperature in the bathtub 6, and the temperature detected by the bath temperature sensor 28 is the bath set temperature (second hot water set temperature). ), The hot water supply control unit 55 stops driving the heat exchange circulation pump 23 and the bath circulation pump 26 to stop the heat insulation operation or the chasing operation.

  Next, a hot water supply operation after intermediate hot water is stored in the hot water storage tank 2 will be described. As shown in FIG. 8, when intermediate warm water is stored near the first intermediate warm water outlet 34 and the intermediate warm water temperature sensor 36 detects intermediate warm water, the outlet switching valve 33 is set to the first intermediate warm water outlet. When the hot water supply mixing tap 3 is opened, the water supply from the water supply pipe 9 flows into the hot water storage tank 2 and at the same time, the intermediate hot water is pushed out from the first intermediate hot water outlet 34 and the intermediate hot water outlet pipe. It flows into the warm water mixing valve 30 through 29.

  Here, when the temperature of the hot water pushed out from the first intermediate hot water outlet 34 is lower than the hot water supply set temperature (first hot water supply set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is adjusted and the upper end of the hot water storage tank 2 is adjusted. The hot water is mixed with the hot water from the hot water discharge pipe 8 and supplied at a temperature higher than the preset hot water supply temperature.

  And the hot water which flowed out from the intermediate temperature water mixing valve 30 flows into the hot water supply mixing valve (first mixing valve) 36 through the first hot water discharge pipe 31, and is mixed with the low temperature water from the first bypass pipe 38, and the hot water supply control section. 55 adjusts the mixing ratio of the hot water supply mixing valve (first mixing valve) 36, and hot water at a hot water supply set temperature (first hot water set temperature) is supplied from the hot water tap 4. Then, the hot water supply is completed by closing the hot water tap 4.

  Here, when the medium hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 switches the hot water outlet switching valve 33 to the upper second intermediate hot water hot water outlet 35 side, as shown in FIG. 2. Hot water is discharged from the medium hot water outlet 35. Therefore, when high temperature water or medium temperature water is stored near the lower first intermediate hot water outlet 34, hot water is discharged from the first intermediate hot water outlet 34, and the water supply pipe 9 is provided near the first intermediate hot water outlet 34. When the low-temperature water from the hot water is stored, the hot water is discharged from the second intermediate hot water outlet 35, and the hot water in the hot water storage tank 2 can be used for hot water supply without being left over.

  Further, since the intermediate warm water mixing valve 30 supplies hot water having a temperature higher than a predetermined hot water supply temperature (first hot water supply set temperature) to the first hot water discharge pipe 31, the first intermediate warm water hot water outlet 34 is provided. When the temperature of the hot water discharged from the second intermediate hot water outlet 35 is lower than the hot water supply set temperature (first hot water set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is adjusted by the hot water control unit 55 and the hot water pipe Hot water at a constant temperature higher than the hot water supply set temperature (first hot water set temperature) is supplied to the first hot water discharge pipe 31 using the high temperature water from 8, and the hot water from the intermediate position of the hot water storage tank 2 is given priority. It is possible to minimize the use of high-temperature water stored in the upper part of the hot water storage tank 2 and to secure more high-temperature water as a heat source.

  Next, when the hot water filling operation is started during the hot water supply operation shown in FIG. 10 or the hot water supply operation is started during the hot water filling operation, the hot water supply control unit 55 performs the hot water supply set temperature (first hot water supply set temperature). ) And the bath set temperature (second hot water supply set temperature), and a temperature higher than the higher temperature by a certain temperature is set as an arbitrary predetermined temperature in the intermediate temperature water mixing valve 30.

  In this way, hot water can be supplied using as much hot water as possible as the heat source according to any hot water set temperature at that time, and the hot water set temperature on the side where hot water is not supplied is high Even if it exists, since the arbitrary predetermined temperature mixed with the intermediate temperature water mixing valve is set to a constant temperature higher than the hot water supply set temperature on the side where the hot water supply temperature is actually supplied, the amount of intermediate temperature water is increased as much as possible. Since hot water can be used, and even when there is a need for simultaneous hot water supply from a plurality of hot water supply ends, the hot water mixing valve 30 discharges hot water at a constant temperature higher than the higher set temperature. In addition, hot water of each set temperature can be simultaneously supplied while effectively using medium temperature water, and use of high temperature water as a heat source can be suppressed, and a large capacity as a heat source can be secured.

  The intermediate hot water return pipe 21 is connected to a position higher than the water supply pipe 9 at the lowermost end of the hot water storage tank 2 and the lower heat pump forward pipe 10, so that the intermediate hot water used as a heat source is returned to the hot water storage tank 2. Even if the hot water is used, low temperature water flows from the lower end of the hot water storage tank 2 and the low temperature water is secured at the lowermost end of the hot water storage tank 2. There is an effect that it can be boiled from low-temperature water.

  Further, since the first intermediate warm water outlet 34 and the second intermediate warm water outlet 35 are provided at a position higher than the intermediate warm water return pipe 21, the intermediate warm water return pipe 21, the first intermediate warm water outlet 34, and the second A certain amount of capacity can be secured between the hot water outlet 35 and the hot water whose temperature has been lowered by the heat exchanger 19 can be temporarily stored by that capacity, and the hot water is discharged from the hot water outlet pipe 29. The medium temperature water that cannot be reduced can be reduced as much as possible. Moreover, since the first medium temperature water outlet 34 and the second medium temperature water outlet 35 are provided vertically, the lower first medium temperature water outlet 34 is provided. Even if the intermediate warm water is stored above, the intermediate warm water can be discharged from the upper second intermediate warm water outlet 35, and the intermediate warm water used as a heat source is wasted in the hot water storage tank 2. Effective for hot water supply It can be used.

  Here, if the intermediate warm water return pipe 21 and the first intermediate warm water outlet 34 or the second intermediate warm water outlet 35 are at the same height, the intermediate warm water is stored at a higher position than the intermediate warm water return pipe 21. Since this cannot be taken out from the first intermediate hot water outlet 34 or the second intermediate hot water outlet 35 that is at the same height as the intermediate hot water return pipe 21, the intermediate hot water is generated at the same time. It is necessary to use medium-temperature water for hot water supply, otherwise hot water is stored in the hot water storage tank 2 until hot water is supplied and the hot water is pushed up to the hot water discharge pipe 8 connected to the upper end of the hot water storage tank 2. It will end up. However, in this embodiment, since the first intermediate hot water outlet 34 or the second intermediate hot water outlet 35 is provided at a position higher than the intermediate warm water return pipe 21 as described above, the difference capacity of this height is provided. The effect of being able to use medium-temperature water for hot water supply even if hot water is supplied at a time interval after generating a certain volume of medium-temperature water from the generation or use of medium-temperature water. There is.

  Thus, since the hot water used as a heat source during hot water supply is taken out from the hot water storage tank 2 in preference to the hot water and hot water is supplied, the hot water cannot be supplied until the hot water is fully supplied. Whenever hot water is supplied, the medium temperature water in the hot water storage tank 2 decreases and is replaced with low temperature water from the water supply pipe 9, and when performing a boiling operation at midnight, the temperature is low, not the medium temperature water with low boiling efficiency. The low-temperature water is boiled by the heat pump circuit 16, which improves the boiling efficiency and improves the COP (energy consumption efficiency) as the heat pump type hot water supply apparatus.

  In this embodiment, the heat exchanger 19, the heat exchange circulation pump 23, and the bath circulation pump 27 are provided in the hot water storage tank unit 1, but are provided in a separate unit body from the hot water storage tank unit 1. However, it does not preclude changing the embodiment without changing the gist of the present invention.

  Further, in this embodiment, a bath circulation circuit 26 is provided on the secondary side of the heat exchanger 19, but a floor heating panel, a hot water hot air heater, a hot water panel convector, a hot water panel radiator, etc. A heating circulation circuit may be provided. In short, any heat equipment that uses heat of the hot water in the hot water storage tank 16 by exchanging heat with the heat exchanger 19 may be used.

  Furthermore, although the heat pump circuit 16 is illustrated as a means for heating the hot water in the hot water storage tank 2, the heat pump circuit 16 is not limited to this, and an electric heater directly disposed in the hot water storage tank 2 or hot water in the hot water storage tank 2 is circulated. Heating may be performed with an electric heater.

The schematic block diagram of one Embodiment of this invention. The figure explaining the action | operation of the boiling operation of the same embodiment. The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. The figure explaining the action | operation of the filling operation of the same embodiment. The figure explaining the action | operation of the heat retention / chase operation of the same embodiment. The figure explaining the action | operation of the hot water supply driving | running | working in case medium temperature water exists in the hot water storage tank of the same embodiment. The figure explaining the action | operation of the hot water supply driving | running | working in case medium temperature water exists in the hot water storage tank of the same embodiment. The figure explaining the action | operation of the hot water supply / hot water filling simultaneous operation in case medium temperature water exists in the hot water storage tank of the same embodiment.

Explanation of symbols

2 Hot water storage tank 4 Hot water tap (first hot water supply end)
8 Hot water pipe 9 Water supply pipe 16 Heat pump circuit (heating means)
29 Middle hot water tap pipe 30 Middle warm water mixing valve 37 Hot water mixing valve (first hot water mixing valve)
38 1st bypass pipe 41 Bath mixing valve (2nd hot water supply mixing valve)
43 Second bypass pipe 44 Hot water filling pipe (second hot water supply end)

Claims (2)

A hot water storage tank having a hot water storage pipe connected to the upper end of the hot water storage pipe connected to the lower end of the hot water stored in the hot water storage tank, and heating means for heating the hot water in the hot water storage tank to a high temperature; The hot water storage tank is connected to a position lower than the hot water discharge pipe, and the medium hot water hot water discharge pipe for allowing the intermediate hot water to flow out of the hot water storage tank, and the hot water from the hot water discharge pipe and the intermediate hot water from the intermediate hot water hot water discharge pipe are optional. A hot water mixed at the predetermined temperature, hot water mixed by the hot water mixing valve, and low-temperature water from the first bypass pipe branched from the water supply pipe are mixed at an arbitrary first hot water supply set temperature. The first mixing valve for supplying hot water from the first hot water supply end, the hot water mixed by the intermediate hot water mixing valve, and the low-temperature water from the second bypass pipe branched from the water supply pipe are set to an arbitrary second hot water supply set temperature. Second to mix and supply hot water from the second hot water supply end An arbitrary predetermined temperature mixed by the intermediate temperature water mixing valve is set to a temperature that is a constant temperature higher than the higher one of the first hot water supply set temperature and the second hot water supply set temperature. Hot water storage type hot water supply device. A hot water storage tank having a hot water storage pipe connected to the upper end of the hot water storage pipe connected to the lower end of the hot water stored in the hot water storage tank, and heating means for heating the hot water in the hot water storage tank to a high temperature; The hot water storage tank is connected to a position lower than the hot water discharge pipe, and the medium hot water hot water discharge pipe for allowing the intermediate hot water to flow out of the hot water storage tank, and the hot water from the hot water discharge pipe and the intermediate hot water from the intermediate hot water hot water discharge pipe are optional. A hot water mixed at the predetermined temperature, hot water mixed by the hot water mixing valve, and low-temperature water from the first bypass pipe branched from the water supply pipe are mixed at an arbitrary first hot water supply set temperature. The first mixing valve for supplying hot water from the first hot water supply end, the hot water mixed by the intermediate hot water mixing valve, and the low-temperature water from the second bypass pipe branched from the water supply pipe are set to an arbitrary second hot water supply set temperature. Second to mix and supply hot water from the second hot water supply end In the case of hot water supply from one hot water supply end, an arbitrary predetermined temperature mixed by the intermediate hot water mixing valve is set to a temperature that is a constant temperature higher than the one hot water supply set temperature. In the case of hot water supply, a hot water storage type hot water supply apparatus characterized in that the temperature is a constant temperature higher than the higher one of the first hot water set temperature and the second hot water set temperature.

Images