JP2018091504A - Heat storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat storage system capable of simplifying constitution associated with a valve for flow passage switching.SOLUTION: A hot water storage type hot water supply system 1 comprises: a first check valve 81 arranged in a primary entrance flow passage 45 connecting an upper part of a hot water storage tank 10 and an entrance of a primary flow passage 22a of a use-side heat exchanger 22; and a second check valve 82 arranged in a collection flow passage 47 connecting a first branch part 46a halfway in a primary exit flow passage 46, connecting an exit of the primary flow passage of the use-side heat exchanger 22 and a second entrance 31b of a three-way valve 31, and a halfway part of the hot water storage tank 10. The three-way valve 31 can switch between a flow passage mode in which a lower flow passage 40 is linked to an outgoing flow passage 41 and a flow passage mode in which the primary exit flow passage 46 is linked to the outgoing flow passage 41. A four-way valve 32 can switch among a flow passage mode in which a return flow passage 42 is linked to a first exit flow passage 43, a flow passage mode in which the return flow passage 42 is linked to a second exit flow passage 44, and a flow passage mode in which the return flow passage 42 is linked to a third exit flow passage 48.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat storage system.

  The conventional hot water storage type hot water supply system disclosed in Patent Document 1 below can perform a heat recovery operation for recovering waste heat of bathtub water in a hot water storage tank, in addition to a heat storage operation and a reheating operation.

JP2013-245919A

  In the system of Patent Document 1, two three-way valves (31, 33) and one four-way valve (32) are provided as flow path switching valves, and by switching the flow path, heat storage operation, reheating operation, and heat In any recovery operation, the circulation pump (21) can be used in common, and the number of pumps can be reduced. However, there are problems that the number of parts constituting the three flow path switching valves is increased, the configurations of the drive device and the control device for operating the valves are complicated, and the product cost is likely to increase.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a heat storage system that can simplify the configuration related to a valve for switching a flow path.

  A heat storage system according to the present invention has an upper part, a lower part, and a middle part at a height between the upper part and the lower part, has a heat storage tank for storing the heat medium, an inlet and an outlet, and heats the heat medium. Heating means, a primary flow path and a secondary flow path, and a utilization side heat exchanger that exchanges heat between a heat medium passing through the primary flow path and a utilization side medium passing through the secondary flow path, A first flow path switching means having a first inlet, a second inlet, and an outlet; a second flow path switching means having an inlet, a first outlet, a second outlet, and a third outlet; a lower portion of the heat storage tank; A lower flow path connecting between the first inlet of the one flow path switching means, an outgoing flow path connecting between the outlet of the first flow path switching means and the inlet of the heating means, and connected in the middle of the forward flow path; A circulation pump for causing the heat medium to flow, a return passage connecting between the outlet of the heating means and the inlet of the second passage switching means, and the upper part of the heat storage tank The primary inlet channel that connects between the inlet of the primary channel of the use side heat exchanger and the primary inlet channel prevent the heat medium from flowing from the use side heat exchanger toward the heat storage tank. A primary outlet channel connecting the first check valve, the outlet of the primary channel of the use side heat exchanger, and the second inlet of the first channel switching means, and the first in the middle of the primary outlet channel A recovery channel that connects between the branch part and the middle part of the heat storage tank; a second check valve that is disposed in the recovery channel and prevents the heat medium from flowing from the heat storage tank toward the first branch part; The first outlet channel connecting the first outlet of the second channel switching means and the upper part of the heat storage tank, the second outlet channel of the second channel switching means, and the middle of the heat storage tank A second outlet channel, a third outlet of the second channel switching means, and a second branch portion between the first check valve and the use side heat exchanger in the primary inlet channel; A third outlet channel connecting the first channel switching means, the first channel switching means, a channel configuration for communicating the lower channel with the forward channel, and a channel configuration for communicating the primary outlet channel with the forward channel. The second flow path switching means includes a flow path configuration for communicating the return flow channel with the first outlet flow channel, a flow channel configuration for communicating the return flow channel with the second outlet flow channel, and a return flow. It is possible to switch the flow path configuration for communicating the path with the third outlet flow path.

  According to the heat storage system of the present invention, the configuration relating to the valve for switching the flow path can be simplified.

It is a figure which shows the hot water storage type hot-water supply system by Embodiment 1. FIG. FIG. 3 is a circuit configuration diagram in a standby state in the hot water storage type hot water supply system of the first embodiment. FIG. 3 is a circuit configuration diagram at the time of a heat storage operation in the hot water storage type hot water supply system of the first embodiment. FIG. 3 is a circuit configuration diagram at the time of bath water replenishment operation using hot water in the hot water storage type hot water supply system of the first embodiment. FIG. 3 is a circuit configuration diagram at the time of bathtub water waste heat recovery operation in the hot water storage type hot water supply system of the first embodiment. It is a figure which shows the hot water storage type hot-water supply system by Embodiment 2. FIG. FIG. 6 is a circuit configuration diagram at the time of an intermediate temperature heating operation in a hot water storage type hot water supply system according to a second embodiment. 6 is a circuit configuration diagram at the time of bathtub water waste heat recovery operation in the hot water storage type hot water supply system according to Embodiment 2. FIG. It is a figure which shows the hot water storage type hot-water supply system by Embodiment 3. FIG. It is a figure which shows the hot water storage type hot-water supply system by Embodiment 4. FIG. FIG. 6 is a circuit configuration diagram at the time of bathtub water waste heat recovery operation in the hot water storage type hot water supply system according to the fourth embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In the drawings, common or corresponding elements are denoted by the same reference numerals, and redundant description is simplified or omitted. The present disclosure may include all combinations of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a hot water storage hot water supply system 1 according to a first embodiment. As shown in FIG. 1, the hot water storage type hot water supply system 1 according to the first embodiment includes a hot water storage tank unit 20, a heat pump unit 60, a control device 70, and a remote controller 80. The hot water storage type hot water supply system 1 is an example of a heat storage system. In the present embodiment, a configuration in which the hot water storage tank unit 20 and the heat pump unit 60 are separate bodies will be described as an example. However, instead of the configuration, the both may be integrated.

  The hot water storage tank unit 20 and the heat pump unit 60 are connected via an outgoing flow path 41, a return flow path 42, and electrical wiring (not shown). In the present embodiment, a control device 70 is built in the hot water storage tank unit 20. The operations of various valves, pumps, compressors and other actuators provided in the hot water storage tank unit 20 and the heat pump unit 60 are controlled by a control device 70 electrically connected thereto. Hereinafter, each component of the hot water storage type hot water supply system 1 will be described.

  The heat pump unit 60 is an example of a heating unit that heats the heat medium. The heat medium in the present embodiment is water. The heat medium may be a liquid heat medium other than water, such as an aqueous calcium chloride solution, an aqueous ethylene glycol solution, or alcohol. The heating means is not limited to the heat pump unit 60. The heating means may be a combustion heating device that heats with the combustion heat of a fuel such as gas, kerosene, heavy oil, or coal. The heating means may be a device that heats the heat medium by solar heat. The heating means may be a combination of a plurality of types of heating devices.

  The heat pump unit 60 includes a refrigerant circuit in which a compressor 61, a water-refrigerant heat exchanger 62, an expansion valve 63, and an air heat exchanger 64 are annularly connected by a refrigerant circulation pipe 65. The heat pump unit 60 operates the refrigeration cycle, that is, the heat pump cycle by circulating the refrigerant in the refrigerant circuit. In the water-refrigerant heat exchanger 62, water is heated by exchanging heat between the high-temperature and high-pressure refrigerant compressed by the compressor 61 and water.

  An outlet temperature sensor 66 installed in the return flow path 42 detects the temperature of water at the water outlet of the water-refrigerant heat exchanger 62 of the heat pump unit 60. In order to obtain high-temperature water with the heat pump unit 60, it is preferable that the heat pump cycle is operated at a pressure exceeding the critical pressure using carbon dioxide as a refrigerant.

  The hot water storage tank unit 20 incorporates the following various parts and piping. The hot water storage tank 10 stores hot water. The hot water storage tank 10 is an example of a heat storage tank that stores a heat medium. Inside the hot water storage tank 10, a temperature stratification in which the upper side is high and the lower side is low can be formed due to the difference in water density depending on the temperature.

  As shown in FIG. 1, the hot water storage tank 10 includes an upper part, a middle part, and a lower part. The middle part of the hot water storage tank 10 is a height portion between the upper part of the hot water storage tank 10 and the lower part of the hot water storage tank 10. Portions corresponding to 1/3 of the capacity of the hot water storage tank 10 may be the upper, middle, and lower portions, respectively, or the upper, middle, and lower portions may be defined at different positions. In the hot water storage tank 10, the upper, middle, and lower portions may be in order from the upper side. In the present invention, when the heat storage tank includes a plurality of tanks connected in series, an upper part, a middle part, and a lower part are defined in the entire heat storage tank from the highest tank to the lowest tank. Just do it.

  A water supply pipe 2 for supplying low-temperature water from a water source such as a water supply communicates with the lower part of the hot water storage tank 10. The hot water supply channel 3 and the first outlet channel 43 communicate with the upper part of the hot water storage tank 10. Hot water in the hot water storage tank 10 passes through the hot water supply passage 3 and is sent to a heat demand section such as a hot water supply terminal outside the hot water storage type hot water supply system 1. In the illustrated configuration, the hot water supply channel 3 and the first outlet channel 43 are connected to the upper part of the hot water storage tank 10 through a common connection port. Instead of this configuration, the hot water supply channel 3 and the first outlet channel 43 may be separately connected to the upper part of the hot water storage tank 10.

  The downstream side of the hot water supply channel 3 is connected to hot water supply terminals such as a faucet, a shower, and a bathtub 50, for example. Hot water stored in the hot water storage tank 10 can be supplied to the hot water supply terminal via the hot water supply passage 3. When hot water in the hot water storage tank 10 flows out into the hot water supply passage 3, low temperature water flows into the hot water storage tank 10 from the water supply pipe 2, whereby the hot water storage tank 10 is maintained in a full state. A mixing valve (not shown) for adjusting the hot water supply temperature by mixing low temperature water from a water source may be provided in the middle of the hot water supply passage 3.

  On the surface of the hot water storage tank 10, a plurality of hot water storage temperature sensors 11, 12, 13 are attached at different height positions. By detecting the temperature distribution of the hot water in the hot water storage tank 10 in the vertical direction by the hot water storage temperature sensors 11, 12, and 13, the amount of hot water stored and the amount of heat stored in the hot water storage tank 10 can be calculated. The control device 70 controls the start and stop of the heat storage operation based on the amount of stored hot water or the amount of stored heat.

  In the hot water storage tank unit 20, a circulation pump 21 and a use side heat exchanger 22 are provided. The circulation pump 21 is a pump for circulating water through various circuits described later. The use-side heat exchanger 22 exchanges heat between the high-temperature water supplied from the hot water storage tank 10 or the heat pump unit 60 and the secondary-side use-side medium, thereby heating the use-side medium. It is an exchanger. The use side heat exchanger 22 has a primary flow path 22a through which water as a heat medium passes, and a secondary flow path 22b through which the use side medium passes.

  The usage-side medium may be, for example, bathtub water led from the bathtub 50 or a heating heat medium. In the first embodiment, the secondary flow path 22b of the use side heat exchanger 22 is connected to a bathtub water circulation circuit 51 that circulates bathtub water guided from the bathtub 50. In the middle of the bathtub water circulation circuit 51, a bathtub water pump 52 for circulating the bathtub water and a bathtub water temperature sensor 53 for detecting the temperature of the bathtub water discharged from the bathtub 50 are installed. The bathtub water pump 52 is an example of a circulation pump that circulates the use-side medium.

  A three-way valve 31 and a four-way valve 32 are provided in the hot water storage tank unit 20. The three-way valve 31 has a first inlet 31a, a second inlet 31b, and an outlet 31c. The three-way valve 31 is an example of a first flow path switching unit. The three-way valve 31 has a first flow path configuration in which the first inlet 31a is connected to the outlet 31c and the second inlet 31b is closed, and a second flow in which the second inlet 31b is connected to the outlet 31c and the first inlet 31a is closed. It is configured to be switchable between road forms.

  The four-way valve 32 has an inlet 32a, a first outlet 32b, a second outlet 32c, and a third outlet 32d. The four-way valve 32 is an example of a second flow path switching unit. The four-way valve 32 has a first flow path configuration in which the inlet 32a communicates with the first outlet 32b to close the second outlet 32c and the third outlet 32d, and the inlet 32a communicates with the second outlet 32c. The second flow path configuration for closing the third outlet 32d and the third flow path configuration for connecting the inlet 32a to the third outlet 32d and closing the first outlet 32b and the second outlet 32c are configured to be switchable. Yes.

  The lower flow path 40 connects between the lower part of the hot water storage tank 10 and the first inlet 31 a of the three-way valve 31. The forward flow path 41 connects between the outlet 31 c of the three-way valve 31 and the water inlet of the water-refrigerant heat exchanger 62 of the heat pump unit 60. A part of the forward flow path 41 is outside the hot water storage tank unit 20 and the heat pump unit 60. A circulation pump 21 is connected to the forward flow path 41 in the hot water storage tank unit 20.

  The return flow path 42 connects between the water outlet of the water-refrigerant heat exchanger 62 of the heat pump unit 60 and the inlet 32 a of the four-way valve 32. A part of the return channel 42 is outside the hot water storage tank unit 20 and the heat pump unit 60. The first outlet channel 43 connects between the first outlet 32 b of the four-way valve 32 and the upper part of the hot water storage tank 10. The second outlet channel 44 connects the second outlet 32 c of the four-way valve 32 and the middle part of the hot water storage tank 10.

  The primary inlet flow path 45 connects between the upper part of the hot water storage tank 10 and the inlet of the primary flow path 22 a of the use side heat exchanger 22. A first check valve 81 is disposed at a position in the middle of the primary inlet channel 45. The first check valve 81 prevents the water in the primary inlet channel 45 from flowing from the use side heat exchanger 22 toward the upper part of the hot water storage tank 10.

  The primary outlet channel 46 connects between the outlet of the primary channel 22 a of the use side heat exchanger 22 and the second inlet 31 b of the three-way valve 31. A first branch portion 46 a is formed at a position in the middle of the primary outlet channel 46. The recovery flow path 47 connects between the first branch part 46 a and the middle part of the hot water storage tank 10. A second check valve 82 is disposed at a position in the middle of the recovery flow path 47. The second check valve 82 prevents the water in the recovery passage 47 from flowing from the middle portion of the hot water storage tank 10 toward the first branch portion 46a.

  In the present embodiment, the connection position of the recovery flow path 47 with respect to the hot water storage tank 10 is lower than the connection position of the second outlet flow path 44 with respect to the hot water storage tank 10.

  A second branch portion 45 a is formed at a position between the first check valve 81 and the use side heat exchanger 22 in the primary inlet channel 45. The third outlet channel 48 connects the third outlet 32d of the four-way valve 32 and the second branch portion 45a.

  When the three-way valve 31 is in the first flow path configuration, the lower part of the hot water storage tank 10 and the water-refrigerant heat exchanger 62 communicate with each other via the lower flow path 40 and the forward flow path 41. When the three-way valve 31 is in the second flow path configuration, the primary inlet flow path 45 communicates with the forward flow path 41.

  When the four-way valve 32 is in the first flow path configuration, the water-refrigerant heat exchanger 62 and the upper part of the hot water storage tank 10 communicate with each other via the return flow path 42 and the first outlet flow path 43. When the four-way valve 32 is in the second flow path configuration, the return flow path 42 communicates with the second outlet flow path 44. When the four-way valve 32 is in the third channel configuration, the return channel 42 communicates with the third outlet channel 48.

  The remote controller 80 has a function of accepting a user operation related to a change in driving operation command and set value. The remote controller 80 is an example of an operation terminal or a user interface device. The control device 70 and the remote controller 80 are connected so as to be capable of bidirectional data communication by wire or wireless. The remote controller 80 is equipped with a display unit that displays information such as the state of the hot water storage hot water supply system 1, an operation unit such as a switch operated by a user, a speaker, a microphone, and the like. The remote control 80 may be installed in the kitchen. The remote control 80 may be installed in a bathroom. The hot water storage type hot water supply system 1 may include a plurality of remote controllers 80.

  FIG. 2 is a circuit configuration diagram in a standby state in the hot water storage type hot water supply system 1 according to the first embodiment. This standby state is a state in which any operation such as a heat storage operation and a bath water retreat operation is not performed. In the standby state: All of circulation pump 21, heat pump unit 60, and bathtub water pump 52 are in a stopped state. The three-way valve 31 is controlled to be in the first flow path form. Thereby, the lower flow path 40 communicates with the forward flow path 41, and the primary outlet flow path 46 is closed. The four-way valve 32 is controlled to be in the third flow path form. Thereby, the return channel 42 communicates with the third outlet channel 48, and the first outlet channel 43 and the second outlet channel 44 are closed.

  FIG. 3 is a circuit configuration diagram in the heat storage operation in the hot water storage type hot water supply system 1 of the first embodiment. The heat storage operation is an operation in which hot water heated by the heat pump unit 60 is stored in the hot water storage tank 10 by flowing into the hot water storage tank 10.

  At the time of heat storage operation, it is as follows. Circulation pump 21 and heat pump unit 60 are operated. The three-way valve 31 is controlled so that the lower flow path 40 is in a first flow path form that communicates with the forward flow path 41. The four-way valve 32 is controlled so that the return flow path 42 is in a first flow path configuration communicating with the first outlet flow path 43.

  In the heat storage operation, water circulates in the following circuit. Low temperature water, for example, 10 ° C. flowing out from the lower part of the hot water storage tank 10 is guided to the heat pump unit 60 via the lower flow path 40, the three-way valve 31, the circulation pump 21, and the forward flow path 41, and water-refrigerant heat is generated. Heated in the exchanger 62. The heated high-temperature water of, for example, 90 ° C. flows into the upper portion of the hot water storage tank 10 via the return flow path 42, the four-way valve 32, and the first outlet flow path 43. By performing such a heat storage operation, high temperature water is stored from the upper layer inside the hot water storage tank 10, and the layer of the high temperature water gradually becomes thicker downward.

  FIG. 4 is a circuit configuration diagram at the time of bath water replenishment operation using hot water in the hot water storage type hot water supply system 1 of the first embodiment. The bath water replenishment operation using hot water is an operation in which the hot water stored in the hot water storage tank 10 is used to heat the bath water in the use side heat exchanger 22.

  When bathing with hot water in a bathtub, the operation is as follows. Circulation pump 21 and bathtub water pump 52 are operated. The heat pump unit 60 stops operating. The three-way valve 31 is controlled so that the primary outlet channel 46 is in the second channel form communicating with the outgoing channel 41. The four-way valve 32 is controlled so that the return flow path 42 is in the form of a second flow path communicating with the second outlet flow path 44.

  In the bath water replenishment operation using hot water storage, water circulates in the following circuit. The high-temperature water flowing out from the upper part of the hot water storage tank 10 is guided to the use side heat exchanger 22 through the primary inlet channel 45. The hot water is deprived of heat by the bathtub water in the use-side heat exchanger 22, so that the temperature is lowered and becomes medium-temperature water. The temperature of the intermediate temperature water that has passed through the primary flow path 22a of the use side heat exchanger 22 is, for example, about 30 ° C to 40 ° C. The intermediate temperature water is supplied from the primary outlet channel 46, the three-way valve 31, the circulation pump 21, the forward channel 41, the water-refrigerant heat exchanger 62 of the heat pump unit 60, the return channel 42, the four-way valve 32, and the second outlet channel. It flows into the middle part of the hot water storage tank 10 via 44. In the hot water storage tank 10, the high-temperature water layer is gradually thinned, and the medium-temperature water layer is gradually thickened. By the bathtub water circulation circuit 51, the bathtub water heated by the use side heat exchanger 22 returns to the bathtub 50, so that the hot water temperature in the bathtub 50 rises.

  If it is assumed that there is no second check valve 82 during the bath water replenishment operation using hot water storage, hot water may flow from the center of the hot water storage tank 10 through the recovery flow path 47 to the primary outlet flow path 46. On the other hand, in this embodiment, the second check valve 82 is provided, so that such a flow can be reliably prevented.

  When the bathtub water refilling operation is started, the operation of the bathtub water pump 52 is first started, and after the time for the bathtub water flowing out from the bathtub 50 to reach the use side heat exchanger 22 has elapsed, the circulation pump 21 It is preferable to start operation.

  FIG. 5 is a circuit configuration diagram in the bathtub water waste heat recovery operation in the hot water storage type hot water supply system 1 of the first embodiment. The bathtub water waste heat recovery operation is an operation of recovering the remaining heat of the bathtub 50, that is, the waste heat of the bathtub water, into the hot water storage tank 10. For example, water of about 5 ° C. to 20 ° C. flows from the water supply pipe 2 into the lower part of the hot water storage tank 10. The temperature of the bath water after the user finishes bathing is, for example, about 30 ° C. to 40 ° C. By performing the bathtub water waste heat recovery operation, the low-temperature water at the lower part of the hot water storage tank 10 can be heated by the waste heat of the bathtub water after bathing and returned to the center of the hot water storage tank 10.

  At the time of bathtub water waste heat recovery operation, it is as follows. Circulation pump 21 and bathtub water pump 52 are operated. Bathtub water circulates in the bathtub water circulation circuit 51. The heat pump unit 60 stops operating. The three-way valve 31 is controlled so that the lower flow path 40 is in a first flow path form that communicates with the forward flow path 41. The four-way valve 32 is controlled so that the return flow path 42 is in the form of a third flow path communicating with the third outlet flow path 48.

  In the bathtub water waste heat recovery operation, water circulates in the following circuit. The low-temperature water flowing out from the lower part of the hot water storage tank 10 is the lower flow path 40, the three-way valve 31, the circulation pump 21, the forward flow path 41, the water-refrigerant heat exchanger 62 of the heat pump unit 60, the return flow path 42, and the four-way valve 32. Then, it flows into the primary flow path 22a of the use side heat exchanger 22 via the third outlet flow path 48 and the second branching portion 45a. Bath water circulates in the secondary flow path 22b of the use side heat exchanger 22 from the bathtub 50 after bathing. The low-temperature water that has flowed into the use-side heat exchanger 22 receives heat from the bath water, so that the temperature rises and becomes, for example, medium-temperature water at 30 ° C. This medium-temperature water flows from the use side heat exchanger 22 into the middle portion of the hot water storage tank 10 via the first branch portion 46a and the recovery flow path 47, and is stored.

  The bathtub water cooled by the use side heat exchanger 22 is returned to the bathtub 50 by the bathtub water circulation circuit 51, so that the temperature of the bathtub water in the bathtub 50 is lowered. The control device 70 stops the circulation pump 21 and the bathtub water pump 52 when the temperature detected by the bathtub water temperature sensor 53 becomes equal to or lower than the reference temperature, and ends the bathtub water waste heat recovery operation.

  Assuming that the first check valve 81 does not exist during the bath water waste heat recovery operation, the low-temperature water that has exited the third outlet channel 48 flows back through the primary inlet channel 45 from the second branching portion 45a to store hot water. There is a possibility of flowing into the upper part of the tank 10. On the other hand, according to the present embodiment, the first check valve 81 is provided, so that such a backflow can be reliably prevented.

  The control device 70 may determine whether or not to execute the bathtub water waste heat recovery operation state, that is, whether or not the waste water recovery of the bathtub water is feasible. After operating the bathtub water pump 52, the control device 70 performs the bathtub water waste heat recovery operation when a water flow detection sensor (not shown) installed in the bathtub water circulation circuit 51 detects that there is a water flow within a predetermined time. You may start. Moreover, the detection temperature of the bathtub water temperature sensor 53 when time (for example, 30 seconds) passes until the bathtub water in the bathtub 50 reaches the bathtub water temperature sensor 53 by operating the bathtub water pump 52 is a predetermined value. When it is (for example, 35 ° C.) or higher, the bath water waste heat recovery operation may be started. Alternatively, the bath water waste heat recovery operation may be started when the detected temperature is higher than the water temperature in the lower part of the hot water storage tank 10 detected by the hot water storage temperature sensor 12.

  If it is this Embodiment, the bathtub water waste heat recovery operation | movement can be performed using the component structure used for the heat storage operation and the bathtub water pursuit operation which are the basic functions of the hot water storage type hot-water supply system 1. FIG. That is, it is not necessary to add a new part such as a heat exchanger or a switching valve only for performing the bath water waste heat recovery operation. In the present embodiment, the above-described plurality of operations can be switched with a configuration in which one circulation pump 21, three-way valve 31, and four-way valve 32 are used in a circuit of water that is a heat medium. For this reason, the hot water storage type hot water supply system 1 having various functions can be realized at a low product cost.

  If it is this Embodiment, the flow path switching means can be made a simple structure by using the first check valve 81 and the second check valve 82. The first check valve 81 and the second check valve 82 are less expensive than the flow path switching valve. Since the first check valve 81 and the second check valve 82 operate automatically, it is not necessary for the control device 70 to control the first check valve 81 and the second check valve 82.

  The hot water storage type hot water supply system 1 may include means for notifying the user of information regarding the above-described plural types of operation states, which differ depending on the flow path form of the three-way valve 31 and the flow path form of the four-way valve 32. For example, information on which of the above-described plural types of driving is being performed may be displayed on the display unit of the remote controller 80 or may be guided by voice from the remote controller 80. By doing so, the user can easily check the operating state of the hot water storage type hot water supply system 1 and the user convenience is improved.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to FIG. 6 to FIG. 8. The difference from the first embodiment will be mainly described, and the elements common or corresponding to the elements described above are as follows. The same reference numerals are attached, and overlapping descriptions are simplified or omitted. FIG. 6 is a diagram showing a hot water storage type hot water supply system 1A according to the second embodiment.

  As shown in FIG. 6, the hot water storage type hot water supply system 1 </ b> A of the second embodiment includes a middle takeout flow path 86 for taking out the heat medium supplied to the heat demanding part from the middle part of the hot water storage tank 10. The connection position of the middle outlet flow passage 86 with respect to the hot water storage tank 10 is lower than the connection position of the hot water supply flow path 3 with respect to the hot water storage tank 10. In the following description, for the sake of convenience, hot water taken out from the middle of the hot water storage tank 10 through the middle take-out flow path 86 is referred to as “medium hot water”, and hot water taken out from the upper part of the hot water storage tank 10 through the hot water supply flow path 3 is referred to as “high temperature water”. Called.

  The hot water storage hot water supply system 1 </ b> A includes an intermediate hot water switching control valve 87 and a mixing valve 89. The medium warm water taken out by the middle take-out flow path 86 flows into the medium warm water switching control valve 87. A water supply branch pipe 85 branched from the water supply pipe 2 is connected to the intermediate temperature water switching control valve 87. The intermediate warm water switching control valve 87 is connected to the mixing valve 89 via the flow path 88. The mixing valve 89 is further connected to the hot water supply passage 3 and the mixed hot water supply pipe 90.

  The medium-temperature water switching control valve 87 is a valve that controls the flow path so that either the medium-temperature water from the middle take-out flow path 86 or the low-temperature water from the feed water branch pipe 85 flows to the flow path 88. Alternatively, the intermediate hot water switching control valve 87 is configured as a mixing valve or a flow rate adjusting valve capable of adjusting the ratio between the flow rate of the low temperature water from the feed water branch pipe 85 and the flow rate of the intermediate temperature water from the middle outlet flow passage 86. Also good.

  The mixing valve 89 allows hot water, which is a mixture of high-temperature water flowing from the hot water supply flow path 3 and water flowing from the flow path 88, to flow into the mixed hot water supply pipe 90. The control device 70 controls the operation of the mixing valve 89 so that the temperature of the hot water flowing through the mixed hot water supply pipe 90 becomes equal to the temperature set by the user using the remote controller 80.

  The hot water storage hot water supply system 1A according to the second embodiment can execute an intermediate temperature heating operation in addition to the heat storage operation of FIG. 3 described in the first embodiment. FIG. 7 is a circuit configuration diagram in an intermediate temperature heating operation in the hot water storage type hot water supply system 1A of the second embodiment. FIG. 7 also shows a path for supplying hot water using the medium-temperature water taken out by the middle take-out flow path 86.

  At the time of medium temperature heating operation, it is as follows. The control device 70 operates the circulation pump 21 and the heat pump unit 60 so that the water temperature at the outlet of the heat pump unit 60 detected by the outlet temperature sensor 66 is lower than that in the heat storage operation. Thereby, heat pump efficiency can be improved compared with the case of heat storage operation. The control device 70 operates the circulation pump 21 so that the circulation flow rate of water is higher than that in the heat storage operation. The three-way valve 31 is controlled so that the lower flow path 40 is in a first flow path form that communicates with the forward flow path 41. The four-way valve 32 is controlled so that the return flow path 42 is in the form of a second flow path communicating with the second outlet flow path 44.

  In the medium temperature heating operation, water circulates in the following circuit. The low-temperature water flowing out from the lower part of the hot water storage tank 10 is guided to the heat pump unit 60 via the lower flow path 40, the three-way valve 31, the circulation pump 21, and the forward flow path 41, and heated in the water-refrigerant heat exchanger 62. Is done. The heated medium temperature water flows into the middle part of the hot water storage tank 10 via the return flow path 42, the four-way valve 32, and the second outlet flow path 44, and is stored.

  For example, when the circulation flow rate of water during the heat storage operation is 1 L / min, the control device 70 operates the circulation pump 21 so that the circulation flow rate of water during the intermediate temperature heating operation is 3 L / min. The speed may be controlled. The control device 70 may control the water temperature at the outlet of the heat pump unit 60 during the intermediate temperature heating operation to be 40 ° C., for example.

  When the shower, faucet or the like (not shown) on the downstream side of the mixed hot water supply pipe 90 is opened and a hot water supply operation in which the user uses hot water is being performed, the control device 70 uses the middle outlet flow channel 86 to supply medium hot water. Is controlled so that hot water mixed with high-temperature water is supplied through the mixed hot water supply pipe 90. Thereby, since the intermediate temperature water produced | generated by the intermediate temperature heating operation with high heat pump efficiency can be supplied to a heat demand part, energy efficiency can be improved. Moreover, the consumption of the intermediate temperature water in the hot water storage tank 10 can be promoted by causing the intermediate temperature water in the hot water storage tank 10 to flow out from the middle take-out passage 86. The control device 70 may perform control so that the medium temperature heating operation is executed when it is detected that the hot water supply operation is being executed.

  FIG. 8 is a circuit configuration diagram of the bathtub water waste heat recovery operation in the hot water storage type hot water supply system 1A of the second embodiment. FIG. 8 also shows a path for supplying hot water using the medium-temperature water taken out by the middle take-out flow path 86. As shown in FIG. 8, the circuit configuration of the bath water waste heat recovery operation in the hot water storage type hot water supply system 1A of the second embodiment is the same as that of the first embodiment described with reference to FIG.

  In the second embodiment, the control device 70 may be configured as follows. When it is detected that the hot water supply operation is being performed, the control device 70 determines whether or not the waste heat recovery of the bathtub water can be performed as described above. Execute water waste heat recovery operation. For example, 30 ° C. medium temperature water heated by the bath water waste heat recovery operation flows into the hot water storage tank 10 through the recovery flow path 47. This medium-temperature water is taken out by the middle take-out flow path 86 and supplied to the heat demanding part. Thus, according to the present embodiment, hot water can be supplied by effectively using the medium-temperature water generated by the bathtub water waste heat recovery operation. Moreover, the increase in the medium temperature water in the hot water storage tank 10 can be suppressed.

  In the present embodiment, the connection position between the middle take-out flow path 86 and the hot water storage tank 10 is higher than the connection position between the recovery flow path 47 and the hot water storage tank 10. In the hot water supply operation, low temperature water flows from the water supply pipe 2 to the lower part of the hot water storage tank 10, so that the medium hot water layer flowing in from the recovery passageway 47 moves upward in the hot water storage tank 10. For this reason, by arranging as described above, it becomes possible to more reliably allow the warm water flowing in from the recovery flow path 47 to flow out of the middle take-out flow path 86.

Embodiment 3 FIG.
Next, the third embodiment will be described with reference to FIG. 9. The difference from the above-described embodiment will be mainly described, and the same or corresponding elements as those described above are denoted by the same reference numerals. In addition, the overlapping description is simplified or omitted. FIG. 9 is a diagram showing a hot water storage type hot water supply system 1B according to the third embodiment.

  As shown in FIG. 9, in the hot water storage type hot water supply system 1B of the third embodiment, the recovery channel 47 and the second outlet channel 44 are connected to the middle part of the hot water storage tank 10 through a common connection port. Yes. That is, one flow path where the recovery flow path 47 and the second outlet flow path 44 merge is connected to the hot water storage tank 10. Thereby, since the number of connection ports formed in the hot water storage tank 10 can be reduced, the product cost can be reduced.

  In the third embodiment, the medium temperature water from the second outlet channel 44 and the medium temperature water from the recovery channel 47 flow into the same position in the hot water storage tank 10, so that they are formed in the hot water storage tank 10. There is an advantage that the temperature and position of the layer of the intermediate temperature water to be made are more stable.

  In the third embodiment, the middle take-out flow path 86 is further connected to the middle portion of the hot water storage tank 10 at a connection port common to the recovery flow path 47 and the second outlet flow path 44. That is, one flow path where the three of the recovery flow path 47, the second outlet flow path 44, and the middle extraction flow path 86 merge is connected to the hot water storage tank 10. Thereby, since the number of connection ports formed in the hot water storage tank 10 can be further reduced, the product cost can be further reduced. Further, the intermediate temperature water from the second outlet channel 44 or the intermediate temperature water from the recovery channel 47 can be used for hot water supply by flowing into the middle takeout channel 86 without flowing into the hot water storage tank 10. Become. Thereby, there exists an effect that the temperature stratification in the hot water storage tank 10 is not disturbed.

  Instead of the illustrated configuration, two of the recovery channel 47, the second outlet channel 44, and the middle outlet channel 86 are connected to the hot water storage tank 10 at a common connection port, and the other one is connected separately. The hot water storage tank 10 may be connected to the mouth. If at least two of the recovery channel 47, the second outlet channel 44, and the middle outlet channel 86 are connected to the hot water storage tank 10 at a common connection port, an effect similar to the above-described effect is obtained. It is done.

Embodiment 4 FIG.
Next, the fourth embodiment will be described with reference to FIG. 10 and FIG. 11. The difference from the above-described embodiment will be mainly described, and the same or corresponding elements as those described above are the same. The overlapping description is simplified or omitted. FIG. 10 is a diagram illustrating a hot water storage type hot water supply system 1C according to the fourth embodiment.

  As shown in FIG. 10, the hot water storage type hot water supply system 1 </ b> C of the fourth embodiment further includes a four-way valve 33 installed in the hot water storage tank unit 20. The four-way valve 33 has a first inlet 33a, a second inlet 33b, a first outlet 33c, and a second outlet 33d. The four-way valve 33 is an example of third flow path switching means. The return channel 42 includes a first return channel 42a and a second return channel 42b. The first return flow path 42 a connects between the water outlet of the water-refrigerant heat exchanger 62 of the heat pump unit 60 and the first inlet 33 a of the four-way valve 33. The second return flow path 42 b connects between the first outlet 33 c of the four-way valve 33 and the inlet 32 a of the four-way valve 32.

  A third branch portion 41 a is formed between the circulation pump 21 and the heat pump unit 60 in the forward flow path 41. The third branch portion 41 a is in the hot water storage tank unit 20. The bypass channel 49 connects between the third branch portion 41 a and the second inlet 33 b of the four-way valve 33. The lower return flow path 39 connects between the second outlet 33 d of the four-way valve 33 and the lower part of the hot water storage tank 10.

  The four-way valve 33 has a first flow path configuration in which the first inlet 33a is communicated with the first outlet 33c and the second inlet 33b and the second outlet 33d are closed, and the first inlet 33a is communicated with the second outlet 33d. A second flow path configuration for closing the two inlets 33b and the first outlet 33c, and a third flow channel configuration for connecting the second inlet 33b to the first outlet 33c and closing the first inlet 33a and the second outlet 33d, The second inlet 33b communicates with the second outlet 33d and is configured to be switchable between a fourth flow path configuration in which the first inlet 33a and the first outlet 33c are closed.

  That is, according to the four-way valve 33, a first flow path configuration in which the first return flow path 42a communicates with the second return flow path 42b, and a second flow path in which the first return flow path 42a communicates with the lower return flow path 39. The configuration can be switched between a third channel configuration in which the bypass channel 49 communicates with the second return channel 42 b and a fourth channel configuration in which the bypass channel 49 communicates with the lower return channel 39.

  FIG. 11 is a circuit configuration diagram of the bathtub water waste heat recovery operation in the hot water storage type hot water supply system 1C of the fourth embodiment. In the bathtub water waste heat recovery operation in the fourth embodiment, the operation is as follows. The three-way valve 31 is controlled so that the lower flow path 40 is in a first flow path form that communicates with the forward flow path 41. The four-way valve 32 is controlled so that the return flow path 42 is in the form of a third flow path communicating with the third outlet flow path 48. The four-way valve 33 is controlled so that the bypass channel 49 is in the form of a third channel communicating with the second return channel 42b. The low-temperature water flowing out from the lower part of the hot water storage tank 10 flows into the lower flow path 40, the three-way valve 31, the circulation pump 21, the third branch 41a, the bypass flow path 49, the four-way valve 33, the second return flow path 42b, and the four-way valve 32. Then, it flows into the primary flow path 22a of the use side heat exchanger 22 via the third outlet flow path 48 and the second branching portion 45a. The medium temperature water heated in the use side heat exchanger 22 flows from the use side heat exchanger 22 into the middle part of the hot water storage tank 10 via the first branch part 46a and the recovery flow path 47 and is stored. .

  According to the fourth embodiment, in the bathtub water waste heat recovery operation, the water flowing out of the hot water storage tank 10 may pass through the route only in the hot water storage tank unit 20 without passing through the heat pump unit 60. Since the water-refrigerant heat exchanger 62 has a complicated shape such as a plate shape or a twisted tube shape, the flow resistance is large and the pressure loss is large. In the fourth embodiment, since the bath water waste heat recovery operation is performed on a route that does not pass through the water-refrigerant heat exchanger 62 having a large flow path resistance, the water circulation flow rate can be increased, and the bath water waste heat recovery operation can be performed. Can be completed in a short time, and the efficiency of heat recovery is improved.

  According to the fourth embodiment, the four-way valve 33 is controlled so that the bypass flow path 49 is in the third flow path form communicating with the second return flow path 42b even in the bath water pursuit operation using hot water. Thus, it becomes possible to operate on a route that does not pass through the water-refrigerant heat exchanger 62 of the heat pump unit 60.

  The first flow path switching means, the second flow path switching means, and the third flow path switching means in the present invention are not limited to the above-described configuration, and can be replaced with other valve configurations that can perform the same function. is there.

  In the above-described embodiment, the heat pump cycle is a supercritical heat pump cycle in which the refrigerant pressure is equal to or higher than the critical pressure, but it goes without saying that the heat pump cycle may be equal to or lower than the critical pressure. In this case, for example, chlorofluorocarbon or ammonia may be used as the refrigerant.

1, 1A, 1B, 1C Hot water storage hot water supply system, 10 Hot water storage tank, 20 Hot water storage tank unit, 21 Circulation pump, 22 Utilization side heat exchanger, 31 Three-way valve, 32, 33 Four-way valve, 40 Lower flow path, 41 Outflow , 42 return channel, 43 first outlet channel, 44 second outlet channel, 45 primary inlet channel, 46 primary outlet channel, 47 recovery channel, 48 third outlet channel, 49 bypass channel, 50 bathtub, 51 bathtub water circulation circuit, 52 bathtub water pump, 60 heat pump unit, 70 control device, 80 remote control, 81 first check valve, 82 second check valve, 86 middle take-out flow path

Claims (12)

A heat storage tank having an upper portion, a lower portion, and a middle portion at a height between the upper portion and the lower portion, and storing a heat medium;
A heating means having an inlet and an outlet and heating the heat medium;
A utilization side heat exchanger having a primary flow path and a secondary flow path, for exchanging heat between the heat medium passing through the primary flow path and a utilization side medium passing through the secondary flow path;
A first flow path switching means having a first inlet, a second inlet, and an outlet;
A second flow path switching means having an inlet, a first outlet, a second outlet, and a third outlet;
A lower flow path connecting between the lower part of the heat storage tank and the first inlet of the first flow path switching means;
A forward flow path connecting between the outlet of the first flow path switching means and the inlet of the heating means;
A circulation pump connected in the middle of the forward flow path and causing the heat medium to flow;
A return flow path connecting between the outlet of the heating means and the inlet of the second flow path switching means;
A primary inlet channel that connects between the upper part of the heat storage tank and the inlet of the primary channel of the use side heat exchanger;
A first check valve that is disposed in the primary inlet channel and prevents the heat medium from flowing from the use-side heat exchanger toward the heat storage tank;
A primary outlet channel connecting between the outlet of the primary channel of the use side heat exchanger and the second inlet of the first channel switching means;
A recovery channel that connects between the first branch portion in the middle of the primary outlet channel and the middle portion of the heat storage tank;
A second check valve that is disposed in the recovery flow path and prevents the heat medium from flowing from the heat storage tank toward the first branch part;
A first outlet channel connecting the first outlet of the second channel switching means and the upper portion of the heat storage tank;
A second outlet channel connecting between the second outlet of the second channel switching means and the middle portion of the heat storage tank;
A third outlet connecting the third outlet of the second flow path switching means and a second branch portion between the first check valve and the use side heat exchanger in the primary inlet flow path. A flow path;
With
The first channel switching means is capable of switching between a channel configuration for communicating the lower channel with the forward channel and a channel configuration for communicating the primary outlet channel with the forward channel,
The second flow path switching means includes a flow path configuration for communicating the return flow channel with the first outlet flow channel, a flow channel configuration for communicating the return flow channel with the second outlet flow channel, and the return flow. It is possible to switch between a flow path form for communicating a path with the third outlet flow path,
Thermal storage system.   In the heat storage operation, the first channel switching unit communicates the lower channel with the forward channel, the second channel switching unit communicates the return channel with the first outlet channel, and the heat storage tank The heat medium flowing out from the lower flow path flows into the heating means via the first flow path switching means and the circulation pump, and the heat medium heated by the heating means is switched to the second flow path. The heat storage system according to claim 1, wherein the heat storage system flows into the heat storage tank via the means and the first outlet channel.   In the operation of heating the use-side medium, the first flow path switching means communicates the primary outlet flow path with the forward flow path, and the second flow path switching means connects the return flow path to the second outlet flow path. The heat medium from the heat storage tank flows through the primary inlet flow path into the utilization side heat exchanger, and the heat medium that has passed through the utilization side heat exchanger is converted into the primary outlet flow path, The heat storage system according to claim 1 or 2, wherein the heat storage system flows into the heat storage tank via the first flow path switching means, the circulation pump, the second flow path switching means, and the second outlet flow path.   In the heat recovery operation for recovering the waste heat of the usage-side medium in the heat storage tank, the first flow path switching means communicates the lower flow path with the forward flow path, and the second flow path switching means is the return flow. The heat medium that is connected to the third outlet flow path and flows out from the heat storage tank to the lower flow path is the first flow path switching means, the circulation pump, the second flow path switching means, and the third flow path. The heat storage system according to any one of claims 1 to 3, wherein the heat storage system flows into the heat storage tank via an outlet channel, the use side heat exchanger, and the recovery channel. A middle take-out flow path for taking out the heat medium supplied to the heat demand section from the middle portion of the heat storage tank;
The heat storage system according to claim 4, wherein the heat recovery operation is executed when the heat medium flows out from the heat storage tank to the middle take-out flow path. Comprising a control means for controlling a heat storage operation for allowing the heat medium heated by the heating means to flow into the heat storage tank, and a medium temperature heating operation;
The control means is configured such that the temperature of the heat medium at the outlet of the heating means during the intermediate temperature heating operation is higher than the temperature of the heat medium at the outlet of the heating means during the heat storage operation. The heat storage system according to any one of claims 1 to 5, wherein the heat storage system is controlled to be low. A middle take-out flow path for taking out the heat medium supplied to the heat demand section from the middle portion of the heat storage tank;
In the intermediate temperature heating operation, the second flow path switching means communicates the return flow path to the second outlet flow path,
The heat storage system according to claim 6, wherein the heat medium heated by the intermediate temperature heating operation can be supplied to the heat demand section through the middle take-out flow path.   The heat storage system according to any one of claims 1 to 7, wherein the recovery channel and the second outlet channel are connected to the heat storage tank through a common connection port. A middle take-out flow path for taking out the heat medium supplied to the heat demand section from the middle portion of the heat storage tank;
8. The device according to claim 1, wherein at least two of the recovery channel, the second outlet channel, and the middle outlet channel are connected to the heat storage tank through a common connection port. The heat storage system according to item. A middle take-out flow path for taking out the heat medium supplied to the heat demand section from the middle portion of the heat storage tank;
The heat storage system according to any one of claims 1 to 9, wherein a connection position of the middle take-out flow path with respect to the heat storage tank is higher than a connection position of the recovery flow path with respect to the heat storage tank. A third flow path switching means having a first inlet, a second inlet, a first outlet, and a second outlet;
A bypass channel connecting the third branch portion between the circulation pump and the heating unit in the forward channel and the second inlet of the third channel switching unit;
A lower return channel connecting between the second outlet of the third channel switching means and the lower part of the heat storage tank;
With
The return channel includes a first return channel that connects between the outlet of the heating unit and the first inlet of the third channel switching unit, and the first outlet of the third channel switching unit. A second return flow path connecting between the inlet of the second flow path switching means,
The third flow path switching means includes a flow path form for communicating the first return flow path with the second return flow path, and a flow path form for communicating the first return flow path with the lower return flow path. The flow path configuration for communicating the bypass flow channel with the second return flow channel and the flow channel configuration for communicating the bypass flow channel with the lower return flow channel can be switched. The heat storage system according to claim 1.   The heat storage system according to claim 11, wherein, in a heat recovery operation for recovering waste heat of the use side medium in the heat storage tank, the third flow path switching unit communicates the bypass flow path with the second return flow path.

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