JP4937052B2 - Hot water storage water heater - Google Patents

Description

  The present invention boils low-temperature water taken from the lower part of a hot water storage tank into hot water with a boiling heat exchanger, while hot water stored in the hot water storage tank is used as a heat source for hot water used in a bathtub or hot water heating equipment. The present invention relates to a hot water storage type water heater that boils water.

  Hot water boiled by the heat source machine is temporarily stored in a hot water storage tank, and when the user opens the hot water tap provided at the end of the hot water pipe connected to the hot water storage tank, the hot water in the hot water storage tank is left as it is or with water. In the hot water storage water heaters that are configured to be discharged, the hot water in the hot water storage tank can be used as a heat source for boiling the hot water used in bathtubs and hot water heating facilities. Has been.

  In such a hot water storage type water heater, a boiling circulation line for boiling low-temperature water taken from the lower part of the hot water storage tank into hot water with a boiling heat exchanger and returning the hot water from the upper part of the hot water storage tank to the hot water storage tank, There is provided a heat source circulation pipe that uses hot water taken from the upper part of the hot water storage tank as a heat source in the secondary usage side heat exchanger and then returns the hot water from the lower part of the hot water storage tank to the hot water storage tank. Conventionally, one circulation pump has been arranged in each circulation pipe. However, in the hot water storage type water heater (hot water heater) described in Patent Document 1, hot water in each circulation pipe is provided by one circulation pump. Allows circulation.

  In the hot water storage type water heater described in Patent Document 1, a first three-way valve is provided on the lower side of the hot water storage tank (hot water tank) in the boiling circulation line, and the boiling three-way valve is used for the boiling circulation line. The second three-way valve is provided on the downstream side of the boiling heat exchanger (hot water supply heat exchanger), and the second three-way valve is connected to the heat source from the boiling circulation line. The circulation line for use is branched. And by arrange | positioning a circulation pump between the 1st three-way valve and the heat exchanger for boiling, the circulation of the hot water in each circulation line is enabled by one circulation pump.

JP 2004-218907 A

  However, in the hot water storage type water heater described in Patent Document 1, when a secondary use operation (tub water boiling operation) is performed in which hot water taken from the upper part of the hot water storage tank is used as a heat source in the secondary usage side heat exchanger In addition, after the hot water taken from the upper part of the hot water storage tank exchanges heat with the spent water in the secondary use side heat exchanger (use side heat exchanger), a boiling heat exchanger (hot water supply heat exchanger) is installed. After that, since it is returned to the lower part of the hot water storage tank, the length of the piping in the heat source circulation line tends to be long. An increase in the pipe length in the heat source circulation line leads to an increase in heat dissipation loss in the heat source circulation line, and an increase in heat dissipation loss leads to a decrease in utilization efficiency of hot water.

  The present invention has been made in view of the above circumstances, and includes a boiling circulation line and a heat source circulation line, and the circulation of hot water in each circulation line can be performed by a single circulation pump. An object of the present invention is to obtain a hot water storage type water heater that can easily increase the utilization efficiency of hot water.

  The hot water storage type water heater of the present invention that achieves the above-mentioned object is for boiling water, in which low-temperature water taken from the lower part of the hot water storage tank is boiled into hot water by a boiling heat exchanger and returned to the hot water storage tank from the upper part of the hot water storage tank. A hot water storage type water heater having a circulation line and a heat source circulation line for returning hot water taken from the upper part of the hot water storage tank to the hot water storage tank from the lower part of the hot water storage tank after being used as a heat source in the secondary use side heat exchanger The boiling circulation line and the heat source circulation line are provided in a region located upstream of the boiling heat exchanger and downstream of the secondary use side heat exchanger. A first common pipe including a second common pipe section provided in a region located downstream of the boiling heat exchanger and upstream of the secondary use side heat exchanger. The passage portion includes a first control valve for joining the boiling circulation line and the heat source circulation line, and a circulation pump. And a second control valve for branching the heat source circulation pipe from the boiling circulation pipe are arranged in this order from the upstream side of the first common pipe section, and one end of the second common pipe is a hot water storage It is connected to the upper part of the tank.

  In addition, another hot water storage type water heater of the present invention that achieves the above-described object is a method in which low temperature water taken from the lower part of the hot water storage tank is boiled into hot water by a boiling heat exchanger and then transferred from the upper part of the hot water tank to the hot water storage tank. A boiling circulation line for returning and a heat source circulation line for returning hot water taken from the upper part of the hot water storage tank to the hot water storage tank from the lower part of the hot water storage tank after being used as a heat source in the secondary use side heat exchanger In the hot water storage type water heater, the circulation line for boiling and the circulation line for heat source include a first shared pipeline part provided in a region located on the upstream side of the heat exchanger for boiling, It includes a second common pipe section provided in a region located on the downstream side of the boiling heat exchanger, and the first common pipe section joins the boiling circulation pipe and the heat source circulation pipe. And a second control valve for branching the heat source circulation line from the boiling circulation line. In addition to being arranged in this order from the upstream side in the 1 shared pipe section, the secondary usage side heat exchanger and the circulation pump are arranged out of order between the first control valve and the second control valve. In addition, one end of the second shared pipeline is connected to the upper part of the hot water storage tank.

  In the hot water storage type water heater according to the present invention, the first shared pipe section is provided in a region located upstream of the boiling heat exchanger, and the circulation pump is disposed in the first shared pipe section. The hot water circulation in each of the boiling circulation line and the heat source circulation line can be performed by one circulation pump. Compared with the hot water supply apparatus described in Patent Document 1 in which the downstream end of the heat source circulation pipe is connected to the hot water storage tank on the downstream side of the boiling heat exchanger (hot water supply heat exchanger), the heat source circulation pipe It is easy to shorten the piping length in the passage, and as a result, it is easy to suppress the heat radiation loss in the circulation pipe for the heat source and increase the utilization efficiency of hot water. Therefore, according to the present invention, it is easy to inexpensively provide a hot water storage type hot water heater that includes a boiling circulation line and a heat source circulation line and has high hot water utilization efficiency.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a hot water storage type water heater of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below.

Embodiment 1 FIG.
FIG. 1 is a block diagram schematically showing an example of a hot water storage type water heater. The hot water storage type water heater 70 shown in the figure has a function of boiling low-temperature water such as city water into hot water and supplying it to a desired location, and a function as a heat source of hot water used in a bathtub, hot water heating equipment, etc. The hot water storage type water heater 70 includes a hot water supply unit 1 and a heat pump unit 60. Hereinafter, the components of the hot water storage type hot water heater 70 will be described.

  The hot water supply unit 1 includes a hot water storage tank 10, a water supply pipe 15 connected to the lower part of the hot water storage tank 10 to supply low temperature water such as city water into the hot water storage tank 10, and a heat pump unit 60 from the lower part of the hot water storage tank 10. And a hot water supply pipe 30 which is connected to the upper part of the hot water storage tank 10 and sends hot water in the hot water storage tank 10 to a desired hot water supply destination. . Further, from the upper part of the hot water storage tank 10 to the lower side of the hot water storage tank 10 through the secondary usage side heat exchanger 35 and the heat source circulation line 40 and the heated equipment 80 such as a bathtub or hot water heating equipment to the secondary usage side. A facility-side circulation conduit 50 that returns to the heated facility 80 via the heat exchanger 35 is also included.

The boiling circulation line 20 is a circulation line for boiling low-temperature water taken from the lower part of the hot water storage tank 10 into hot water by the heat pump unit 60 and then returning it to the upper part of the hot water storage tank 10. The boiling circulation pipe 20 includes a first dedicated pipe section 20a having one end connected to the lower portion of the hot water storage tank 10, and a first shared pipe connected to the downstream end of the first dedicated pipe section 20a. connecting the parts CL _1, and a second dedicated pipeline section 20b which is connected to the first downstream end of the common conduit section CL _1, and the upper portion of the downstream end and the hot water storage tank 10 of the second dedicated pipeline section 20b second and a common conduit section CL _2.

The first common line portion CL ₁ of the above is provided on the upstream side of the heat pump unit 60, the first common pipe portion CL _1, boiling for raising circulation pipe 20 and the heat source for the circulating pipeline 40 Are arranged in this order from the upstream side, the first control valve 22 for joining the two, the circulation pump 24, and the second control valve 26 for branching the heat source circulation line 40 from the boiling circulation line 20. . The first control valve 22 has two inlets and one outlet, and the second control valve 26 has one inlet and two outlets. Each of the first control valve 22 and the second control valve 26 is driven by a motor M. The second control valve 26 can arbitrarily change the flow rate at each of the two outlets.

The heat source circulation line 40 uses hot water taken from the upper part of the hot water storage tank 10 as a heat source for heating the used water in the secondary usage side heat exchanger 35 and then returns the hot water from the lower part of the hot water storage tank 10 to the hot water storage tank 10. It is a circulation line. The heat source circulation pipe 40 reaches the first control valve 22 through the second shared pipe section CL ₂ and the second shared pipe section CL ₂ through the secondary use side heat exchanger 35. the connecting a first dedicated pipeline section 40a, a first common line portion CL ₁ of the above first downstream end of the common conduit section CL ₁ (second control valve 26) and a lower portion of the hot water storage tank 10 2 dedicated conduit section 40b.

  The facility-side circulation conduit 50 circulates the used water (water or hot water) taken from the heated facility 80 such as a bathtub or a hot water heating facility after being heated by the secondary usage side heat exchanger 35 and then returned to the heated facility 80. It is a pipeline. Heating of the used water in the secondary usage side heat exchanger 35 is performed using hot water flowing down the heat source circulation pipe 40, specifically, hot water flowing down the first dedicated pipe 40a as a heat source. In the illustrated example, the circulation pump 55 is disposed between the heated facility 80 and the secondary usage side heat exchanger 35.

  On the other hand, the heat pump unit 60 is for boiling low temperature water flowing down in the boiling circulation pipe 20 into hot water. The compressor 61 compresses the refrigerant, the heat exchanger 62 for boiling, and the expansion valve 63. And a refrigerating cycle system constituted by an evaporator 64 and a circulation pipe 65 that connects these in an annular shape, and a cooling fan 66 for cooling the evaporator 65 is provided in the vicinity of the evaporator 64. ing. The refrigerant is compressed by the compressor 61 to become high temperature and high pressure, and then radiates heat by the boiling heat exchanger 62, is depressurized by the expansion valve 63, absorbs heat by the evaporator 64, and becomes a gas state. 61 is inhaled.

  A region of the boiling circulation pipe 20, specifically, a region of the second dedicated pipe part 20 b passes through the boiling heat exchanger 62 and flows down the second dedicated pipe part 20 b. The low-temperature water is boiled into hot water by exchanging heat with the above-mentioned refrigerant condensed to a high temperature and high pressure in the boiling heat exchanger 62.

  Although not shown, the hot water storage type hot water heater 70 includes a control unit that controls operations of the first control valve 22, the circulation pump 24, the second control valve 26, the circulation pump 55, and the heat pump unit 60, and the control unit. And an operation unit that is used as an input device for commands and the like. The hot water storage type water heater 70 performs a hot water boiling operation or a secondary usage operation using the hot water in the hot water storage tank as a heat source in accordance with a command or the like input from the operation unit by the user. Hereinafter, each operation will be described with reference to FIG. 2 or FIG.

FIG. 2 is a block diagram showing a flow path of low temperature water or hot water when a boiling operation is performed by the hot water storage type hot water supply device 70. As indicated by an arrow A in the figure, during boiling operation, low-temperature water or hot water flows down in the boiling circulation line 20, and the first dedicated line 40 a of the heat source circulation line 40 from above the hot water storage tank 10. influx of water to the inlet of the hot water from the first common pipe portion CL ₁ to the second dedicated line portion 40g of the heat source for the circulating pipe 40, and the inflow of used water to the equipment-side circulation line 50 Absent. That is, at the time of boiling up operation, the first control valve 22 is communicated with only the first dedicated line portion 20a to the first common line portion CL _1, the second control valve 26 is only the second private line portion 20b first 1 so as to communicate with the shared line portion CL _1, these operations of the first control valve 22 and the second control valve 26 is controlled. Further, the circulation pump 24 and the heat pump unit 60 are respectively operated. Circulation pump 55 is not operated.

  The hot water storage tank 10 before the start of the boiling operation is filled with low temperature water such as city water supplied from the water supply pipe 15 or the remaining hot water stays on the upper side and the low temperature supplied from the water supply pipe 15 is reached. Water stays below and is full. When the boiling operation is started, low-temperature water flows from the lower part of the hot water storage tank 10 into the boiling circulation line 20, and is heated to hot water by the boiling heat exchanger 62, and then from the upper part of the hot water storage tank 10. It is returned to the hot water storage tank 10. A temperature sensor (not shown) is provided on the lower side of the hot water storage tank 10, and when the control unit (not shown) detects that the temperature detected by the temperature sensor exceeds a predetermined temperature, the control unit End boiling operation.

FIG. 3 is a block diagram showing a flow path of hot water and used water when a secondary use operation is performed by the hot water storage type hot water heater 70. As indicated by an arrow B in the figure, during secondary use operation, hot water taken from the upper part of the hot water storage tank 10 flows down the heat source circulation pipe 40, and used water is removed by the secondary use side heat exchanger 35. After being heated, it is returned to the hot water storage tank 10 from the lower part of the hot water storage tank 10. Moreover, as shown by the arrow C in the figure, the used water taken from the heated facility 80 flows down the facility-side circulation pipe 50 and the hot water flowing down the heat source circulation pipe 40 is used as a heat source. After being heated by the secondary usage side heat exchanger 35, it is returned to the heated facility 80. No inflow of cold water from the lower part of the hot water storage tank 10 to the first common line portion CL _1.

That is, when secondary usage operation, the first control valve 22 is communicated with only the first dedicated line portion 40a to the first common line portion CL _1, the second control valve 26 is only the second private line section 40b so as to communicate with the first common line portion CL _1, these operations of the first control valve 22 and the second control valve 26 is controlled. Further, the circulation pump 24 and the circulation pump 55 are operated. The heat pump unit 60 is not operated.

  A control unit (not shown) that the temperature detected by a temperature sensor (not shown) provided in a predetermined location of the facility-side circulation pipe 50, for example, in the vicinity of the inlet to the heated facility 80, exceeds a predetermined temperature. Is detected, the secondary use operation is terminated. When the secondary use operation is performed, the high temperature hot water stored in the upper part of the hot water storage tank 10 flows into the heat source circulation pipe 40 and is deprived of heat by the secondary use side heat exchanger 35, As a result, the amount of hot water in the hot water storage tank 10 gradually decreases as a result of being returned from the lower part of the hot water storage tank 10 to the hot water storage tank 10, so that the hot water storage type hot water heater 70 is a temperature provided on the upper side of the hot water storage tank 10. When the control unit detects that the temperature detected by a sensor (not shown) is below a predetermined temperature, the secondary usage operation is terminated. It is also possible to configure the hot water storage type hot water heater 70 so as to maintain or increase the amount of heat stored in the hot water storage tank 10 by replenishing hot water whose temperature has decreased in the secondary usage operation while continuing the secondary usage operation.

FIG. 4 is a block diagram showing a flow path of hot water and used water when the secondary use operation and the reheating operation are simultaneously performed by the hot water storage type hot water heater 70. When the secondary use operation and the follow-up operation are performed simultaneously, as shown by arrows B and C in the figure, hot water or used water in each of the heat source circulation pipe 40 and the facility-side circulation pipe 50 is used. The circulation form is the same as the circulation form when the secondary use operation is performed independently. On the other hand, in the chasing operation, as indicated by an arrow D in the figure, a part of the hot water whose temperature is lowered due to the heat deprived by the secondary use side heat exchanger 35 due to the secondary use operation is transferred to the first common pipe. after the road section CL ₁ are reheating flows into boiling raising circulation path 20 (second dedicated pipeline section 20b), is returned from the second upstream side of the common line portion CL ₂ to the heat source for the circulation path 40 .

At this time, the first control valve 22 is communicated with only the first dedicated line portion 40a to the first common line portion CL _1, the second control valve 26 has two second dedicated pipeline section 20b, and 40b first as to communicate with the shared line portion CL _1, these operations of the first control valve 22 and the second control valve 26 is controlled. Hot water flowing down the first dedicated line 40a of the heat source circulating passage 40, after flowing down the first common line portion CL ₁ and flows from the first control valve 22 to the first common line portion CL _1, The second control valve 26 distributes each of the two second dedicated pipe sections 20b and 40b at a predetermined ratio. Then, the second control valve 26 is distributed to the second dedicated pipeline section 20b yu, second upstream side of the common line portion CL ₂ after being boiled in hot water by boiling for raising the heat exchanger 62 To the first dedicated pipe section 40a of the heat source circulation path 40. Further, the hot water distributed to the second dedicated pipe section 40 b by the second control valve 26 is returned to the hot water storage tank 10 from the lower part of the hot water storage tank 10.

When the secondary use operation and the follow-up operation are performed simultaneously, the circulation pump 24, the circulation pump 55, and the heat pump unit 60 are each operated. The amount of hot water flowing from the second control valve 26 to each of the second dedicated pipe sections 20b and 40b takes into account, for example, the required heating capacity in the secondary usage side heat exchanger 35 and the heating capacity of the heat pump unit 60. The rotation speed of the circulation pump 24 is adjusted based on data created in advance, and the distribution ratio of the second control valve 26 is adjusted. It is not the inflow of cold water from the lower part of the hot water storage tank 10 to the first common line portion CL _1.

Above the hot-water storage type water heater 70 having the configuration described, the first common line portion CL ₁ in a region located downstream of the upstream side of the boiling-up heat exchanger 62 and the secondary usage-side heat exchanger 35 Since the circulation pump 24 is provided and disposed here, the circulation pump 24 can circulate hot water in each of the boiling circulation line 20 and the heat source circulation line 40. Since it is not necessary to arrange one circulation pump in each of the boiling circulation line 20 and the heat source circulation line 40, the manufacturing cost can be reduced. Compared with the hot water supply apparatus described in Patent Document 1 in which the downstream end of the heat source circulation pipe is connected to the hot water storage tank on the downstream side of the boiling heat exchanger (hot water supply heat exchanger), the heat source circulation pipe It is easy to shorten the piping length in the path 40, and as a result, it is easy to suppress the heat radiation loss in the heat source circulation pipe 40 and increase the utilization efficiency of hot water. Therefore, in the hot water storage type hot water heater 70, it becomes easy to provide a low-cost hot water utilization efficiency that includes the boiling circulation line 20 and the heat source circulation line 40 and has high utilization efficiency of hot water.

  In addition, when the hot water storage type hot water heater 70 is configured so that hot water whose temperature has decreased in the secondary usage operation can be replenished while the secondary usage operation is continued, the amount of heat stored in the hot water storage tank 10 is reduced. Since it is possible to prevent a drop, it is possible to boil the hot water used in the heated equipment 80 such as a bathtub or hot water heating equipment while ensuring the amount of hot water supplied from the hot water storage tank 10 to a hot water supply destination such as a kitchen or a washroom. As a result, the convenience increases.

Embodiment 2. FIG.
FIG. 5 is a block diagram schematically showing another example of the hot water storage type hot water heater. Water storage type water heater shown in FIG. 75, the point that secondary usage-side heat exchanger 35 is disposed between the first control valve 22 and the circulation pump 24 in the first common line portion CL ₁ Except for this, it has the same configuration as the hot water storage type hot water heater 70 (see FIG. 1) described in the first embodiment. Since all the constituent elements shown in FIG. 5 have been described in the first embodiment, the same reference numerals as those used in FIG.

  The illustrated hot water storage type hot water heater 75 performs a hot water boiling operation or a secondary usage operation using the hot water in the hot water storage tank as a heat source in accordance with a command or the like input from the operation unit (not shown) by the user. In addition, the hot water storage type hot water heater 75 can be configured to perform a reheating operation of hot water whose temperature has decreased in the secondary use operation or a heat recovery operation of recovering heat from the used water. Hereinafter, each operation will be described with reference to FIGS.

FIG. 6 is a block diagram showing a flow path of low temperature water or hot water when a boiling operation is performed by the hot water storage type hot water supply device 75. At the time of boiling operation by the hot water storage type hot water heater 75, the first control valve 22 is connected to the first dedicated pipe section 20a in the same manner as at the time of boiling operation by the hot water storage type hot water supply apparatus 70 (see FIG. 1) described in the first embodiment. only communicates with the first common line portion CL _1, so that the second control valve 26 communicates only the second private line portion 20b to the first common line portion CL _1, these first control valve 22 and The operation of the second control valve 26 is controlled. Further, the circulation path circulation pump 24 and the heat pump unit 60 are operated. Circulation pump 55 is not operated.

As a result, as indicated by an arrow A in the figure, low temperature water flows into the boiling circulation line 30 from the lower part of the hot water storage tank 10 and is heated to hot water by the boiling heat exchanger 62 and then stored in hot water. The hot water storage tank 10 is returned from the upper part of the tank 10. Influx of water from the upper portion of the hot water storage tank 10 to the first dedicated line 40a of the heat source for circulation line 40, from the first common pipe portion CL ₁ to the second dedicated line portion 40g of the heat source for the circulating pipeline 40 There is no inflow of hot water and no inflow of used water into the facility-side circulation pipe 50. A temperature sensor (not shown) is provided on the lower side of the hot water storage tank 10, and when the control unit (not shown) detects that the temperature detected by the temperature sensor exceeds a predetermined temperature, the control unit End boiling operation.

FIG. 7 is a block diagram showing flow paths of hot water and used water when the secondary use operation is performed by the hot water storage type hot water supply device 75. At the time of secondary use operation by the hot water storage type hot water heater 75, the first control valve 22 sets only the first dedicated pipe section 40a to the first time as in the secondary use operation by the hot water storage type hot water supply apparatus 70 described in the first embodiment. 1 communicates with the common line portion CL _1, the second control valve 26 so as to communicate only the second private line portion 40b to the first common line portion CL _1, these first control valve 22 and the second control The operation of the valve 26 is controlled. Further, the circulation pump 24 and the circulation pump 55 are operated. The heat pump unit 60 is not operated.

As a result, as indicated by an arrow B in the figure, hot water taken from the upper part of the hot water storage tank 10 flows down the heat source circulation conduit 40 and the spent water is heated by the secondary usage side heat exchanger 35. Later, the hot water storage tank 10 is returned to the hot water storage tank 10 from below. Moreover, as shown by the arrow C in the figure, the used water taken from the heated facility 80 flows down the facility-side circulation pipe 50 and the hot water flowing down the heat source circulation pipe 40 is used as a heat source. After being heated by the secondary usage side heat exchanger 35, it is returned to the heated facility 80. No inflow of cold water from the lower part of the hot water storage tank 10 to the first common line portion CL _1.

  When the control unit (not shown) detects that the temperature detected by a temperature sensor (not shown) provided at a predetermined location in the facility-side circulation pipeline 50 exceeds a predetermined temperature, the secondary use operation is terminated. . Alternatively, when the control unit detects that the temperature detected by a temperature sensor (not shown) provided on the upper side of the hot water storage tank 10 is lower than a predetermined temperature, the secondary use operation is terminated. It is also possible to configure the hot water storage type hot water supply device 75 so as to replenish hot water whose temperature has decreased in the secondary use operation while continuing the secondary use operation.

FIG. 8 is a block diagram showing a flow path of hot water and used water when the secondary use operation and the reheating operation are simultaneously performed by the hot water storage type hot water heater 75. During simultaneous operation of the secondary use operation and reheating operation by hot-water storage type water heater 75, the first control valve 22 is communicated with only the first dedicated line portion 40a to the first common line portion CL _1, the second control the valve 26 has two second dedicated pipeline section 20b, 40b and so as to first communicate with the shared line portion CL _1, these operations of the first control valve 22 and the second control valve 26 is controlled. Hot water flowing down the first dedicated line 40a of the heat source circulating passage 40, after flowing down the first common line portion CL ₁ and flows from the first control valve 22 to the first common line portion CL _1, The second control valve 26 distributes at a predetermined ratio to the second dedicated pipe section 20b of the boiling circulation pipe section 20 and the second dedicated pipe section 40b of the heat source circulation path 40.

As a result, as indicated by arrows B and C in the figure, the circulation mode of hot water or used water in each of the heat source circulation line 40 and the facility-side circulation line 50 is performed in a secondary use operation alone. It becomes the same as the circulation form at the time. On the other hand, in the boiling circuit 20, as indicated by an arrow D in the drawing, a part of the hot water whose temperature has been reduced due to the heat deprived by the secondary use side heat exchanger 35 during the secondary use operation is the first. after 1 from the shared pipe section CL ₁ are reheating flows into boiling raising circulation passage 20 is returned from the second upstream side of the common line portion CL ₂ to the heat source for the circulation path 40. However, there is no inflow of cold water from the lower part of the hot water storage tank 10 to the first common line portion CL _1.

  When the secondary use operation and the chasing operation are simultaneously performed by the hot water storage type hot water heater 75, the circulation pump 24, the circulation pump 55, and the heat pump unit 60 are operated. The amount of hot water flowing from the second control valve 26 to each of the second dedicated pipe sections 20b and 40b is the simultaneous operation of the secondary use operation and the reheating operation by the hot water storage hot water heater 70 described in the first embodiment. Adjusted in the same way as time.

  FIG. 9 is a block diagram showing flow paths of hot water and low-temperature water when a heat recovery operation is performed by the hot water storage type hot water supply device 75. The heat recovery operation by the hot water storage type hot water heater 75 does not require the hot water used in the heated equipment 80 to be replenished, and the equipment-side circulation pipe from the heated equipment 80 is lower than the low-temperature water stored in the lower part of the hot water storage tank 10. This is performed when the used water flowing into the passage 50 has a higher temperature. Therefore, prior to performing the heat recovery operation, the circulation pump 55 is operated, and the temperature of hot water flowing down the facility-side circulation conduit 50 is detected by a temperature sensor (not shown) installed in the facility-side circulation conduit 50. At the same time, the temperature sensor (not shown) installed in the lower part of the hot water storage tank 10 detects the temperature of the low-temperature water stored in the lower part of the hot water storage tank 10 and compares these temperatures with a control unit (not shown). .

During heat recovery operation was the first control valve 22 communicates with only the first dedicated line portion 20a to the first common line portion CL _1, the second control valve 26 is only the second private line portion 40b first shared pipe as to communicate with the road section CL _1, these operations of the first control valve 22 and the second control valve 26 is controlled. Further, the circulation pump 24 and the circulation pump 55 are operated. The heat pump unit 60 is not operated.

As a result, the low-temperature water flows from the first dedicated pipeline section 20a of the boiling-up for recycle line 20 to the first common line portion CL _1, which is stored in the lower portion of the hot water storage tank 10, the equipment-side circulation pipeline 50 the first second dedicated line portion 40b of the common conduit section for heat source circulating pipe 40 from CL ₁ after being heated by performing heat exchange with the secondary usage-side exchanger 35 with the hot water flowing down It flows in and is returned to the lower part of the hot water storage tank 10. Heat is taken from the used water used in the heated facility 80, and the hot water in the hot water storage tank 10 can be heated by the heat. There is no inflow of hot water into the heat source circulation line 40 from the upper part of the hot water storage tank 10.

  The hot water storage hot water heater 75 having the above-described configuration is easy to reduce the manufacturing cost and improve the hot water utilization efficiency for the same reason as the hot water storage hot water heater 70 (see FIG. 1) described in the first embodiment. Easy to improve convenience. Furthermore, since the hot water storage type hot water heater 75 can perform the heat recovery operation described above, it is easy to save energy.

  As mentioned above, although the hot water storage type hot water heater of the present invention has been described with reference to the embodiment, the present invention is not limited to the above-described form as described above. For example, the number of secondary usage-side heat exchangers and facility-side circulation pipelines is not limited to one, and the number of secondary usage-side heat exchangers and facility-side circulation pipelines may be a bathtub or hot water heating system. It can be appropriately selected according to the total number of facilities to be heated such as facilities. Moreover, about an equipment side circulation pipeline, it can also be set as arbitrary components other than setting it as an essential component.

  The heat pump unit may be, for example, a unit that pressurizes carbon dioxide, which is a refrigerant, to a pressure higher than the critical pressure, or may be a unit that pressurizes the refrigerant to a pressure lower than the critical pressure. As the refrigerant, in addition to carbon dioxide, fluorocarbon gas, ammonia gas, or the like may be used. The hot water storage type hot water heater of the present invention can be variously modified, modified, combined, etc. in addition to those described above.

  Since the hot water storage type hot water supply apparatus of the present invention can also perform secondary use of hot water, in order to save energy in homes and offices equipped with a bathtub, hot water heating equipment, etc. in addition to hot water supply equipment. It is suitable.

It is a block diagram which shows roughly an example of the hot water storage type water heater of this invention. It is a block diagram which shows the flow path of the low temperature water or hot water when a boiling operation is performed by the hot water storage type hot water supply device shown in FIG. It is a block diagram which shows the flow path of the hot water when the secondary use driving | operation is performed with the hot water storage type water heater shown in FIG. It is a block diagram which shows the flow path of hot water and used water when a secondary use driving | operation and a chasing operation are performed simultaneously with the hot water storage type water heater shown in FIG. It is a block diagram which shows roughly the other example of the hot water storage type water heater of this invention. It is a block diagram which shows the flow path of low temperature water or hot water when a boiling operation is performed with the hot water storage type water heater shown in FIG. It is a block diagram which shows the flow path of the hot water and used water when secondary use driving | operation is performed with the hot water storage type water heater shown in FIG. It is a block diagram which shows the flow path of hot water and used water when a secondary use driving | operation and a chasing operation are performed simultaneously with the hot water storage type water heater shown in FIG. It is a block diagram which shows the flow path of hot water and low temperature water when heat recovery driving | operation is performed with the hot water storage type water heater shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply unit 10 Hot water storage tank 20 Circulation line for boiling 20a 1st exclusive pipe part 20b 2nd exclusive pipe part 22 1st control valve 24 Circulation pump 26 2nd control valve 35 Secondary use side heat exchanger 40 Heat source Circulation pipeline 40a First dedicated pipeline section 40b Second dedicated pipeline section 50 Equipment-side circulation pipeline 55 Circulation pump 60 Heat pump unit 62 Boiling heat exchanger 70, 75 Hot water storage type water heater

Claims (4)

Boiling low temperature water taken from the bottom of the hot water tank is boiled into hot water by a boiling heat exchanger and returned to the hot water tank from the upper part of the hot water tank, and hot water taken from the upper part of the hot water tank is A hot water storage type hot water heater comprising a heat source circulation pipe that is used as a heat source in a secondary use side heat exchanger and then returned from the lower part of the hot water storage tank to the hot water storage tank,
The boiling circulation pipe and the heat source circulation pipe include a first shared pipe section provided in a region located on the upstream side of the boiling heat exchanger, and the heating heat Including a second shared pipeline section provided in a region located downstream of the exchanger;
A first control valve that joins the boiling circulation line and the heat source circulation line, and the heat source circulation line branch from the boiling circulation line to the first common line part. The second control valve is arranged in this order from the upstream side in the first shared pipe section, and the secondary usage side heat exchanger and the circulation pump are the first control valve and the second control valve. Arranged in random order with the control valve,
One end of the second common conduit portion is connected to the upper portion of the hot water storage tank,
A hot water storage water heater characterized by that. The second control valve can individually adjust the amount of flow to the boiling circulation line and the amount of flow to the heat source circulation line,
Secondary usage operation using hot water taken from the upper part of the hot water storage tank as a heat source in the secondary usage side heat exchanger, and the temperature is lowered due to heat being taken away by the secondary usage side heat exchanger during the secondary usage operation After a part of the hot water is poured from the first shared pipe section into the boiling circulation pipe and chased, the additional hot water is returned to the heat source circulation pipe from the upstream side of the second shared pipe section. Can be run at the same time,
The hot water storage type water heater according to claim 1 . To claim 1 or 2, characterized in that the used water which is water intake from other equipment using hot water and boiled in the secondary usage-side heat exchanger is provided with further equipment-side circulation pipe back to the plant The hot water storage water heater described. When the spent water is hotter than the low-temperature water stored in the lower part of the hot water storage tank, the low-temperature water is removed from the hot water storage tank while the intake from the hot water storage tank to the heat source circulation pipe is stopped. From the first shared pipe section to the heat source circulation pipe after being heated by exchanging heat with the used water by the secondary usage side exchanger. The hot water storage type hot water supply device according to claim 3 , wherein a heat recovery operation can be performed in which the heat is returned to the hot water storage tank.

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