JP2014145498A - Heat pump type hot-water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump type hot-water supply apparatus capable of performing operation with high energy efficiency.SOLUTION: A heat pump type hot-water supply apparatus 1 includes a heat pump unit 2 for heating hot water, a hot water storage tank 23 capable of storing hot water in a state where thermal stratification is formed in the inside and a heat exchanger 24. Further, a hot water supply passage 63 capable of supplying hot water heated by the heat pump unit 2 to the heat exchanger 24 without allowing the hot water to pass the hot water storage tank 23 is formed. After allowing hot water supplied to a primary side passage of the heat exchanger 24 by the hot water supply passage 63 to pass the heat exchanger 24, the hot water is allowed to flow into the hot water storage tank 23 from the bottom of the tank 23, and after passing the hot water on the bottom side of the hot water storage tank 23, the hot water is allowed to flow out to the heat pump unit 2.

Description

  The present invention relates to a heat pump type hot water supply apparatus.

  In recent years, heat pump hot water supply devices have become widespread due to increasing awareness of environmental issues. Since this heat pump type hot water supply apparatus supplies hot water by absorbing heat from the air, it is said to have a mitigating effect on the heat island phenomenon.

  As such a heat pump type hot water supply apparatus, there is one provided with a heat pump type heat source machine and a hot water storage tank for storing hot water. According to such a heat pump type hot water supply apparatus, hot water heated using inexpensive nighttime electric power is stored in a hot water storage tank, and the stored hot water can be supplied to a hot water tap such as a currant or a shower. Therefore, the cost for hot water supply can be reduced.

  By the way, the hot water stored in the hot water storage tank is not only supplied to the hot water tap, but may be used for reheating a bath, heating, or the like. In this case, a circulation channel including a bathtub and a heating device is formed, and a heat medium for supplying heat to the hot water of the bathtub and the heating device flows through the circulation channel. In addition, a heat exchanger is provided in the circulation channel, and the circulation channel extends through the secondary side channel of the heat exchanger. Furthermore, hot water stored in the upper part of the hot water storage tank can be supplied to the primary flow path of the heat exchanger. And heat exchange is performed between the hot hot water flowing through the primary flow path of the heat exchanger and the hot water or heat medium in the bathtub flowing through the secondary flow path of the heat exchanger. In this way, hot water and a heat medium in the bathtub are heated, and bathing and heating are performed.

  Here, the temperature of hot water required when supplying hot water to the hot water tap is lower than the temperature of hot water required when heating the hot water or the heat medium in the bathtub. Therefore, in a heat pump type hot water supply device, it is necessary for the operation of reheating the bath or heating, etc., in order to make it possible to perform both the supply of hot water to the hot water tap and the operation of reheating the bath and heating. It is necessary to store hot water that is said to be stored in a hot water storage tank.

  Specifically, when hot water is supplied to the hot water tap with the heat pump type hot water supply apparatus having such a configuration, the hot water discharged from the hot water storage tank is mixed with the low temperature hot water supplied from the water supply source. Then supply to the hot water tap. On the other hand, when bathing or heating is performed, hot hot water discharged from the hot water storage tank is supplied to the heat exchanger as it is. That is, in the case of a configuration in which a plurality of operations with different required hot water temperatures can be performed, such as an operation for supplying hot water to a hot-water tap and a reheating operation for a bath, It is necessary to store hot water at the highest temperature among hot water temperatures required for each in a hot water storage tank. When performing an operation with a low required hot water temperature (for example, an operation of supplying hot water to the hot water tap), it is necessary to mix the hot and cold hot water and lower the temperature of the hot water.

  However, with such a configuration, there is a problem that the hot water cannot be efficiently supplied to the hot water tap.

  Explaining in detail with an example, if the temperature of hot water stored in the hot water storage tank is the same as the temperature required for the hot water tap, just supply the hot water in the hot water storage tank to the hot water tap as it is This makes it possible to supply hot water to the hot water tap. On the other hand, when the temperature of the hot water stored in the hot water storage tank is higher than that required by the hot water tap, as described above, the hot water discharged from the hot water storage tank is mixed with the low temperature hot water, It is necessary to lower the temperature.

  Here, when the temperature of hot water is raised to a temperature higher than the required temperature and mixed with low-temperature hot water to supply the heated hot water, the temperature of the hot water should be raised more than necessary. Therefore, there is a problem that the energy consumed to raise the temperature of the hot water is wasted.

  Therefore, there is a technique disclosed in Patent Document 1 as a technique for solving such a problem.

  First, the hot water storage tank (hot water tank) provided in the heat pump hot water supply device (heat pump water heater) disclosed in Patent Document 1 is a tank in which temperature stratification is formed when the heat pump hot water supply device is used. . That is, the hot and cold water introduced from the top is layered at a certain temperature difference, and the temperature of each layer becomes lower from the upper side toward the bottom side.

  And in the heat pump type hot water supply apparatus disclosed in Patent Document 1, the hot water stored in the upper part of the hot water storage tank can be discharged from a hot water tap (faucet). On the other hand, when hot water is supplied to the primary flow path of the heat exchanger, the hot water heated by the heat pump type heat source device is supplied directly to the heat exchanger without flowing into the hot water storage tank.

  That is, in the heat pump hot water supply apparatus disclosed in Patent Document 1, when hot water is discharged from a hot water tap, high-temperature hot water stored in the upper part of the hot water storage tank is used. On the other hand, when heating a heat medium with a heat exchanger, low-temperature hot water is used after being heated with a heat pump type heat source. That is, the hot water stored in the upper part of the hot water storage tank is used when the hot water is discharged from the hot water tap, but is not used when the heat medium is heated. And when heating a heat medium, it has the composition which heats and uses the low-temperature hot water stored in the lower part of the hot water storage tank supplied from the external water supply source, after flowing out from the hot water storage tank. .

  Specifically, in this case, when the hot water is discharged from the hot water tap, the hot water in the hot water storage tank may be discharged, and when the heat medium is heated by the heat exchanger, the hot water heated to the required temperature is supplied to the heat exchanger. What is necessary is just to supply to a primary side flow path. That is, in both cases of supplying hot water to the hot water tap or heating the heat medium with a heat exchanger, it is not necessary to supply the hot water after mixing it with many low-temperature hot water. That is, in any case, the hot water is not heated to a temperature much higher than the required temperature. Therefore, hot water can be efficiently heated in various operations of the heat pump type hot water supply apparatus. Therefore, it is possible to improve energy efficiency when using the heat pump hot water supply apparatus.

Japanese Patent No. 4425957

  By the way, in the heat pump type hot water supply apparatus disclosed in Patent Document 1, when heating the heat medium, the hot water that has passed through the heat exchanger and cooled down is made to flow again toward the heat pump type heat source unit, or the upper part of the hot water storage tank. Or flow into other parts.

Here, the case where it flows in into parts other than the upper part of a hot water storage tank is demonstrated.
As described in Patent Document 1, “It does not matter where the second hot water pipe is connected to a position where the temperature of the hot water stored in the upper part of the tank is not lowered”. In the heat pump hot water supply apparatus disclosed in 1), hot water that has been cooled and passed through a heat exchanger is caused to flow from any part except for a part on the upper side of the hot water storage tank. This prevents the temperature of the hot water stored in the upper part of the hot water storage tank from being lowered.

  More specifically, the hot water that has cooled down after passing through the heat exchanger becomes an intermediate temperature hot water that is lower than the temperature of the hot water stored in the upper part of the hot water storage tank and higher than the temperature of the hot water supplied from the water supply source. . Therefore, if such medium-temperature hot water flows from the upper part of the hot water storage tank, the medium-temperature hot water and hot hot water stored in the upper part of the hot water storage tank mix, resulting in storage in the upper part of the hot water storage tank. There is a possibility that the temperature of the hot water will decrease. Therefore, in the heat pump hot water supply apparatus disclosed in Patent Document 1, medium temperature hot water is introduced into a portion that is not on the upper side of the hot water storage tank so that the temperature of the hot water stored in the upper portion of the hot water storage tank does not decrease.

  However, in such a structure, there exists a problem that the temperature stratification formed in the hot water storage tank will be disturbed.

If it demonstrates concretely, the temperature of the hot water which fell through the heat exchanger will not be constant, and may become a different temperature every time it passes a heat exchanger. Moreover, the temperature of the hot water previously stored in the part into which the hot water that has passed through the heat exchanger is allowed to flow inside the hot water storage tank may also vary depending on the usage status of the heat pump hot water supply apparatus.
Therefore, when the hot water that has passed through the heat exchanger is caused to flow into the hot water storage tank, the temperature of the hot water that newly flows in may be different from the temperature of the hot water that is stored in advance in the portion where the hot water flows. In this case, when hot water that has passed through the heat exchanger is caused to flow into the hot water storage tank, in the hot water storage tank, in the vicinity of the portion where the hot water has flowed (in the vicinity of the portion where the hot water inlet is formed), there are two different things. The hot and cold water will be mixed. As a result, the temperature of the hot water stored near the portion into which the hot water has flowed changes. That is, the temperature changes in at least one of the layers forming the temperature stratification. And depending on the position of the layer where the temperature has changed, the temperature stratification formed in the hot water storage tank will be greatly disturbed.

  If the temperature stratification is disturbed in the hot water storage tank in this way, there arises a problem that the hot water storage efficiency of the heat pump type hot water supply apparatus is lowered, and the energy efficiency in operation of the heat pump type hot water supply apparatus is lowered, which is not preferable.

  Then, this invention makes it a subject to provide the heat pump type hot-water supply apparatus which can operate | move more efficiently in view of the problem of the above-mentioned prior art.

  The invention according to claim 1 for solving the above-mentioned problems has a circulation path in which an expansion means, an evaporation means, a compression means, and a condensation means are annularly connected, and the heat pump device circulates the heat medium in the circulation path. Hot water heated by the heat pump device can be stored from the top side, a hot water storage tank capable of storing hot water in a state in which temperature stratification is formed therein, and hot water heated by the heat pump device A heat pump type hot water supply apparatus comprising a heat exchanger that exchanges heat by passing through a path, wherein hot water heated by the heat pump apparatus is supplied to the heat exchanger without passing through the hot water storage tank A hot water supply flow path that can be heated by the heat pump device and supplied to the primary flow path of the heat exchanger by the hot water supply flow path; A heat pump type hot water supply apparatus characterized in that water passes through the heat exchanger and then flows in from the bottom of the hot water storage tank, passes through the bottom side portion of the hot water storage tank and then flows out to the heat pump apparatus side. is there.

In the heat pump hot water supply apparatus of the present invention, hot water supplied to the heat exchanger without passing through the hot water storage tank is caused to flow from the bottom of the hot water storage tank.
Here, when heating the hot water in the hot water storage tank with a heat pump type hot water supply device, in order not to disturb the temperature stratification in the hot water storage tank, let the low temperature hot water on the bottom side flow out and heat outside, then the top side The inflow from. That is, the hot water stored near the bottom of the hot water storage tank becomes hot water that flows out to the outside first when the hot water in the hot water storage tank is heated.
In the heat pump hot water supply apparatus of the present invention, hot water that has passed through the heat exchanger is caused to flow near the bottom of the hot water storage tank. Therefore, even if the temperature stratification is disturbed at a part near the bottom in the hot water storage tank by flowing in the hot water, the hot water at the portion where the temperature stratification is disturbed quickly flows out to the outside. Therefore, the temperature stratification formed between the top of the hot water storage tank and the upper side of the bottom is not disturbed. That is, even if hot water that has passed through the heat exchanger flows into the hot water storage tank, the temperature stratification formed over the entire hot water storage tank is maintained over a large portion, and the temperature stratification is not greatly disturbed. As a result, it is possible to prevent a decrease in hot water storage efficiency of the heat pump type hot water supply apparatus due to disturbance of temperature stratification, and an energy efficient operation is possible.

Furthermore, in the heat pump hot water supply apparatus of the present invention, the hot water heated by the heat pump apparatus and supplied to the heat exchanger passes through the bottom side portion of the hot water storage tank and then flows out to the heat pump apparatus side.
Here, when the hot water is stored in the state where the temperature stratification is formed inside the hot water storage tank, the bottom side portion of the hot water storage tank is a part where hot water having the lowest temperature is stored. Moreover, although the temperature of the hot water that has passed through the heat exchanger decreases as it passes through the heat exchanger, the temperature is higher than that of the coldest hot water in the hot water storage tank. And when boiling hot water with a heat pump device, it is known that heating hot water with a high temperature will deteriorate the heating efficiency (COP) compared with heating low temperature hot water.
The heat pump type hot water supply apparatus of the present invention allows the hot water passing through the heat exchanger to pass through the bottom side portion of the hot water storage tank before returning it to the heat pump apparatus. For this reason, hot water that has passed through the heat exchanger mixes with low-temperature hot water when passing through the bottom side portion in the hot water storage tank, and the temperature is lowered. Thereby, compared with the case where the hot water which passed the heat exchanger is returned to a heat pump apparatus as it is, the temperature of the hot water returned to a heat pump apparatus can be made into a low temperature. That is, since the temperature of the hot water returned to the heat pump device can be lowered, the heat pump hot water supply device of the present invention can be operated with good energy efficiency (heating efficiency).

  The invention according to claim 2 has a tank water supply pipe for supplying hot water from an external water supply source to the inside of the hot water storage tank, and one end of the tank water supply pipe is connected to the bottom of the hot water storage tank, The hot water supply flow path is connected to a tank water supply pipe, and the hot water passing through the primary side flow path of the heat exchanger flows into the hot water storage tank via the tank water supply pipe. It is a heat pump type hot-water supply apparatus of description.

According to this configuration, hot water that has passed through the primary flow path of the heat exchanger can be allowed to flow into the hot water storage tank without providing a new connection port in the hot water storage tank.
Specifically, in order to allow hot water that has passed through the primary flow path of the heat exchanger to flow into the hot water storage tank, it is necessary to connect a pipe connected to the downstream side of the heat exchanger to the hot water storage tank. However, in this case, it is necessary to form a connection port in the hot water storage tank for connecting a pipe connected to the downstream side of the heat exchanger.
On the other hand, according to the configuration in which the hot water supply flow path is connected to the tank water supply pipe and the hot water that has passed through the primary side flow path of the heat exchanger flows into the hot water storage tank through the tank water supply pipe, the tank water supply pipe is connected. Hot water can flow into the hot water storage tank from the connection port. That is, hot water that has passed through the primary flow path of the heat exchanger can be allowed to flow into the hot water storage tank without providing a new connection port in the hot water storage tank.
That is, according to such a configuration, the hot water passing through the primary flow path of the heat exchanger can be allowed to flow into the hot water storage tank without processing the hot water storage tank, so that the heat pump hot water supply device of the present invention can be made inexpensively. Can be provided.

  The invention according to claim 3 is characterized in that a baffle plate for restricting movement of hot water stored on the bottom side to the top side is provided in the hot water storage tank. It is a heat pump type hot-water supply apparatus described in 1.

  In such a configuration, the baffle plate is provided inside the hot water storage tank, and the hot water stored on the bottom side is restricted from moving to the top side. That is, the hot water that has flowed into the hot water storage tank from the bottom side is not easily mixed with the hot water stored on the upper side of the hot water storage tank. For this reason, disturbance of the temperature stratification formed over most of the upper side in the hot water storage tank can be more reliably prevented.

  According to the present invention, hot water that has passed through a heat exchanger can be caused to flow into the hot water storage tank without greatly disturbing the temperature stratification formed throughout the hot water storage tank. As a result, it is possible to prevent a decrease in hot water storage efficiency of the heat pump type hot water supply apparatus due to disturbance of temperature stratification, and an energy efficient operation is possible.

It is an operation principle figure showing the hot-water supply device concerning the embodiment of the present invention. It is an operation principle figure which shows the heat pump unit of FIG. It is an operation principle figure which shows the hot-water supply apparatus of FIG. 1, a thermal storage system is shown by a thick line, and the flow of the hot water at the time of thermal storage operation is shown by the arrow. It is an operation | movement principle figure which shows the hot-water supply apparatus of FIG. 1, a hot-water supply system is shown by a thick line, and the flow of the hot water at the time of hot-water supply operation is shown by the arrow. It is an operation | movement principle figure which shows the hot water supply apparatus of FIG. 1, a heat supply system is shown by a thick line, and the flow of the hot water at the time of a chasing operation is shown by the arrow. It is a flowchart which shows the procedure of the chasing operation which the hot water supply apparatus of FIG. 1 implements.

  Hereinafter, although the hot-water supply apparatus 1 (heat pump type hot-water supply apparatus) concerning embodiment of this invention is demonstrated in detail, this invention is not limited to these examples.

  As shown in FIG. 1, the hot water supply device 1 of the present embodiment is formed by connecting a heat pump unit 2 (heat pump device) and a heat recovery device 3 by piping.

Moreover, the hot water supply device 1 includes a control device (not shown), and this control device can receive signals from various sensors provided in the respective units.
This control device includes a CPU as a calculation means and a memory as a storage means. Further, a program necessary for controlling the hot water supply device 1 is stored, and information detected by each sensor or the like and information calculated by the calculation means based on information detected by each sensor or the like can be stored. And when this control apparatus transmits an operation command to each part of the hot water supply device 1, the hot water supply device 1 is configured to perform various operations.

  As shown in FIG. 2, the heat pump unit 2 forms a circulation path 12 inside the housing 11. The circulation path 12 is formed by connecting an expansion valve 13 (expansion means), an evaporator 14 (evaporation means), a compressor 15 (compression means), and a condenser 16 (condensation means) in an annular manner in this order. A heat medium that changes phase is enclosed and circulated.

The condenser 16 is a heat exchanger having a primary flow path through which a heat medium flows and a secondary flow path through which hot water flows, and is provided so as to heat the hot water by heat exchange.
If it demonstrates concretely, the secondary side flow path of the condenser 16 will be in the state to which the reciprocating piping 18 extended from the heat recovery apparatus 3 (refer FIG. 1) was connected. For this reason, between the heat pump unit 2 and the heat recovery device 3, a hot water passage extending through the secondary side passage of the condenser 16 is formed. That is, the condenser 16 is configured to heat the low-temperature hot water supplied from the heat recovery device 3 and return the heated hot water to the heat recovery device 3.

  As shown in FIG. 1, the heat recovery apparatus 3 includes a hot water storage tank 23 and a heat exchanger 24 for heat compensation (heat exchanger) as main components.

  The hot water storage tank 23 is a sealed tank capable of storing hot water therein. In the hot water storage tank 23, two pipe connection portions (hereinafter also referred to as a top connection portion 28 and a top connection portion 29) are formed at or near the top in the vertical direction. And two pipe connection parts (henceforth the bottom part connection part 30 and the bottom part connection part 31) are also formed in the lowest part of the up-down direction, or its vicinity. And the piping which comprises the thermal storage system 40, the hot water supply system 41, and the heat supply system 42 (all are mentioned later in detail) is connected to these piping connection parts.

  The hot water storage tank 23 has a configuration in which a plurality of tank temperature sensors 35a to 35e are arranged in the direction in which the hot water stored therein rises (in the height direction). The tank temperature sensors 35a to 35e function as temperature detection means for detecting the temperature of hot water in the hot water storage tank 23, respectively. Further, the tank temperature sensors 35a to 35e detect the remaining amount of hot water at a predetermined temperature in the hot water storage tank 23 or the remaining amount of hot water at which the hot water temperature falls within a predetermined temperature range. It also functions as a means.

Here, when the liquid is stored in the hot water storage tank 23, if the temperature difference between the liquids is equal to or greater than a predetermined threshold (about 10 degrees Celsius for hot water), the liquid is divided into layers for each temperature. Therefore, the hot water flowing through the heat storage system 40 (which will be described in detail later) is heated to a temperature higher than the threshold temperature with respect to the temperature of the hot water in the hot water storage tank 23 so that the hot water in the hot water storage tank 23 is not disturbed. When returned, the hot water stored in the hot water storage tank 23 is divided into layers for each temperature. That is, temperature stratification is formed inside the hot water storage tank 23. In other words, the hot water storage tank 23 can be said to be a tank capable of forming temperature stratification inside.
Note that, based on the values detected by the tank temperature sensors 35 a to 35 e installed in the hot water storage tank 23, it is possible to calculate the amount of hot water stored at which the hot water temperature falls within a predetermined temperature range. That is, it is possible to detect how much hot water heated to a desired temperature range is stored in the hot water storage tank 23.

  Here, when attention is paid to the inside of the hot water storage tank 23, a baffle plate 36 is provided in a portion slightly above the bottom portion.

  The baffle plate 36 is positioned slightly above the two bottom connection portions 30 and 31 and is a plate body arranged with a predetermined gap between the two bottom connection portions 30 and 31. . And this baffle board 36 is provided so that the space in the hot water storage tank 23 may be divided in the up-down direction, and the movement to the upper side of the hot water stored by the lower end side is controlled.

That is, the space in the hot water storage tank 23 is divided into an upper large area consisting of the uppermost part and a lower small area consisting of a part of the lower end side, with the baffle plate 36 as a boundary. And most of the boundary between the upper large region and the lower small region cannot be moved in the vertical direction by the baffle plate 36, and a part of the boundary is in the vertical direction. Therefore, in the hot water storage tank 23, the hot water stored in the lower small region and the hot water stored in the upper large region are difficult to mix.

  The reheating heat exchanger 24 is a so-called liquid-liquid heat exchanger, and is a heat exchanger for use in reheating operation in which hot water in a bathtub (not shown) is circulated and heated appropriately. That is, a high temperature water supply pipe 63 (hot water supply flow path) through which high temperature hot water flows is connected to the primary flow path of the heat exchanger 24 for remedy, and the secondary flow path is connected to the interior of the bathtub. A bathtub water circulation pipe 64 through which hot water flows is connected. For this reason, in the memorial heat exchanger 24, hot water in the bathtub flowing in the secondary channel can be heated by high-temperature hot water flowing in the primary channel.

  Next, in the hot water supply apparatus 1 of the present embodiment, each system that forms a main flow path will be described. The hot water supply apparatus 1 of the present embodiment mainly includes a heat storage system 40, a hot water supply system 41, and a heat supply system 42.

  The heat storage system 40 includes a heat pump unit 2 and a hot water storage tank 23 to form an annular continuous flow path, as indicated by a thick line in FIG. The heat storage system 40 includes a heat storage forward pipe 45, a reciprocating pipe 18, a heat storage return pipe 46, and a tank connection pipe 47.

  The heat storage forward pipe 45 is a pipe through which hot water flows from the bottom connection portion 31 of the hot water storage tank 23 toward the heat pump unit 2. The heat storage forward pipe 45 is provided with a boiling pump 48.

  As described above, the reciprocating pipe 18 is a pipe that connects the heat pump unit 2 and the heat recovery device 3, and a pipe that extends including the secondary flow path of the condenser 16 provided inside the heat pump unit 2. It has become. Note that one end of the reciprocating pipe 18 is continuous with the heat storage forward pipe 45, and the other end is continuous with the heat storage return pipe 46.

  The heat storage return pipe 46 is a pipe through which hot water flows from the heat pump unit 2 side to the hot water storage tank 23 side.

  The tank connection pipe 47 is a pipe that connects the end of the heat storage return pipe 46 on the hot water storage tank 23 side and the top connection section 28 of the hot water storage tank 23. Here, a three-way valve 49 is provided between the heat storage return pipe 46 and the tank connection pipe 47.

The three-way valve 49 has three ports, and a heat storage return pipe 46, a tank connection pipe 47, and a high-temperature water supply pipe 63 are connected to each port. The three-way valve 49 functions as a flow path switching means for switching the flow path by closing an appropriate port among the three ports.
More specifically, by closing the port to which the high temperature water supply pipe 63 is connected, the flow path connecting from the heat storage return pipe 46 to the tank connection pipe 47 is brought into communication. At this time, hot water does not flow from the heat storage return pipe 46 to the high temperature water supply pipe 63.
On the other hand, by closing the port to which the tank connection pipe 47 is connected, the flow path connecting from the heat storage return pipe 46 to the high temperature water supply pipe 63 is brought into communication. At this time, hot water does not flow from the heat storage return pipe 46 to the tank connection pipe 47.

  The hot water supply system 41 forms a flow path for discharging hot water having a desired temperature to the outside as shown by the thick line in FIG. The hot water supply system 41 includes a water inlet pipe 52, a tank water supply pipe 53, a tank hot water outlet pipe 54, a hot water outlet pipe 55, and a general hot water supply pipe 56.

  The water intake pipe 52 is a pipe for flowing hot water supplied from a water supply source (not shown) into the heat recovery apparatus 3.

  The tank water supply pipe 53 is a pipe that branches from the middle portion of the water inlet pipe 52 and extends to the bottom connection portion 30 of the hot water storage tank 23. That is, it is a pipe for flowing hot water flowing into the water inlet pipe 52 from a water supply source (not shown) from the bottom of the hot water storage tank 23.

  The tank outlet pipe 54 is a pipe extending from the top connection portion 29 of the hot water storage tank 23, and one end thereof is connected to the top connection portion 29 and the other end is connected to the hot water mixing valve 58.

  The hot water mixing valve 58 has three ports, to which a water inlet pipe 52, a tank hot water outlet pipe 54, and a hot water outlet pipe 55 are respectively connected. Therefore, the low-temperature hot water flowing from the water inlet pipe 52 and the high-temperature hot water flowing from the tank outlet pipe 54 are mixed by the hot water mixing valve 58 and flow out to the hot water pipe 55.

  The hot water discharge pipe 55 branches into a general hot water supply pipe 56 and a bath dropping pipe 57 on the downstream side in the hot water flow direction. That is, the hot water supply pipe 55 is a pipe for supplying hot water that has passed through the hot water / water mixing valve 58 to the general hot water supply pipe 56 and the bath dropping pipe 57.

  The general hot water supply pipe 56 is a pipe for supplying hot water to an external hot water tap (not shown) such as a shower or a currant. The general hot water supply pipe 56 is provided with a water amount adjusting valve 59 so that the flow rate of the hot water discharged can be adjusted.

  The bath dropping pipe 57 is a pipe connecting the above-described hot water extraction pipe 55 and the bathtub water circulation pipe 64 of the heat supply system 42, and supplies hot water to a bathtub (not shown) in the dropping operation (described later in detail). It is the piping used when doing.

  The heat supply system 42 includes a heat medium circulation passage 61 formed so as to include the heat pump unit 2 and the primary passage of the heat exchanger 24 for remedy, and a bathtub (see FIG. 5). And a bath water circulation channel 62 formed so as to include the secondary side channel of the heat exchanger for remedy 24, for heating hot water stored in the bath (not shown). Is.

That is, the heat supply system 42 includes a heat storage forward pipe 45, a reciprocating pipe 18, a heat storage return pipe 46, a high temperature water supply pipe 63, and a tank water supply pipe 53 as pipes forming the heat medium circulation passage 61. In addition, a bathtub water circulation pipe 64 is provided as a pipe forming the bathtub water circulation passage 62.
In the following description, overlapping description of the above-described heat storage forward pipe 45, reciprocating pipe 18, heat storage return pipe 46, and tank water supply pipe 53 is omitted.

  The high-temperature water supply pipe 63 is a pipe extending from the three-way valve 49 to the middle part of the tank water supply pipe 53, and one end thereof is connected to the tank water supply pipe 53. Further, the middle portion of the high-temperature water supply pipe 63 is integrated with the primary flow path of the heat exchanger 24 for remedy. That is, the high temperature water supply pipe 63 extends including the primary side flow path of the heat exchanger 24 for remedy, and the hot water flowing through the high temperature water supply pipe 63 flows into the primary side flow of the remedy heat exchanger 24. It will pass the road.

  The high-temperature water supply pipe 63 is provided with a remedy pump 68 on the downstream side in the hot water flow direction from the remedy heat exchanger 24, and further on the downstream side in the hot water flow direction from the remedy pump 68. A check valve 69 is provided. The check valve 69 allows hot water to flow from the high temperature water supply pipe 63 side to the tank water supply pipe 53 side, but prevents hot water from flowing from the tank water supply pipe 53 side to the high temperature water supply pipe 63 side. .

  The bathtub water circulation pipe 64 is a pipe that extends from the hot water inlet of a bathtub (not shown) to the hot water supply port of the bathtub (not shown) through the inside of the heat recovery device 3. The secondary flow path is connected. That is, the bathtub water circulation pipe 64 extends including the secondary side flow path of the heat exchanger 24 for remedy, and the bathtub water flowing through the pipe 64 for circulates the bathtub water circulates. It will pass through the secondary channel.

  The bathtub water circulation pipe 64 is provided with a bath circulation pump 70. And if the bath circulation pump 70 is driven, the hot water stored in the bathtub (not shown) will flow through the bathtub water circulation piping 64. That is, hot water circulates through a bathtub water circulation passage 62 formed including a bathtub water circulation pipe 64 and a bathtub (not shown).

  Next, various operations that can be performed by the hot water supply apparatus 1 of the present embodiment will be described. The hot water supply device 1 of the present embodiment can perform a heat storage operation, a general hot water supply operation, a dropping operation, and a memorial operation.

[Heat storage operation]
As shown in FIG. 3, the heat storage operation is an operation in which hot water stored in the hot water storage tank 23 is circulated and heated in the heat storage system 40 by operating the boiling pump 48. More specifically, after the low-temperature hot water flowing out from the bottom side of the hot water storage tank 23 flows into the heat pump unit 2 and is heated by the condenser 16 (see FIG. 2), the reciprocating pipe 18, the heat storage return pipe 46, and the tank The operation of flowing in from the top side of the hot water storage tank 23 through the connecting pipe 47 is performed. And by performing such operation | movement continuously, the hot water heated by the hot water storage tank 23 will be stored gradually. That is, in this heat storage operation, a circulating flow of hot water is generated from the bottom of the hot water storage tank 23 toward the top of the hot water storage tank 23 via the heat pump unit 2.
When this heat storage operation is performed, the port to which the high-temperature water supply pipe 63 of the three-way valve 49 is connected is closed beforehand so that hot water can flow from the heat storage return pipe 46 side to the tank connection pipe 47 side. Then, the boiling pump 48 is operated to perform a heat storage operation.

[General hot water supply operation]
As shown in FIG. 4, the general hot water supply operation is an operation in which hot water is supplied using the high-temperature hot water stored in the hot water storage tank 23 by the heat storage operation described above. A specific operation will be described below.

  When an external hot-water tap (not shown) such as a currant or shower is operated, low-temperature hot water supplied from an external water supply source flows into the inlet pipe 52. At this time, a part of the low-temperature hot water flows toward the hot-water mixing valve 58. Further, the remaining portion of the low-temperature hot water flows into the hot water storage tank 23 from the bottom via the tank water supply pipe 53. When low-temperature hot water flows in from the bottom side of the hot water storage tank 23, high-temperature hot water stored on the top side is pushed out and flows out to the tank outlet pipe 54. Then, the hot hot water flowing through the tank outlet pipe 54 and the low temperature hot water flowing from the inlet pipe 52 toward the hot water mixing valve 58 are mixed by the hot water mixing valve 58 and adjusted to a predetermined temperature. Subsequently, hot water flowing out from the hot water / mixing valve 58 side to the hot water supply pipe 55 flows through the general hot water supply pipe 56 and is supplied to an external hot water tap (not shown).

[Drop operation]
The drop-in operation is an operation of filling a bathtub (not shown) with hot water stored in the hot water storage tank 23 using the hot water supply operation described above.
In the drop-in operation, hot water at a predetermined temperature is discharged from the hot water discharge pipe 55 by the same operation as the general hot water supply operation described above. Then, hot water flows from the hot water discharge pipe 55 to the bath dropping pipe 57 and from the bath dropping pipe 57 to the bathtub water circulation pipe 64, and hot water is supplied from the bathtub water circulation pipe 64 to the inside of the bathtub (not shown).

[Memorial operation]
The memorial operation is an operation in which the hot water stored in the bathtub (not shown) is heated by the hot water heated by the heat pump unit 2 without using the hot water stored in the hot water storage tank 23. First, an outline of the memorial operation will be described.

  When carrying out the follow-up operation, the port to which the tank connection pipe 47 of the three-way valve 49 is connected is closed in advance so that hot water can flow from the heat storage return pipe 46 side to the high temperature water supply pipe 63 side. Then, as shown in FIG. 5, hot water is circulated in the heat medium circulation passage 61, and hot water heated by the heat pump unit 2 is supplied to the heat exchanger 24 for remedy without passing through the hot water storage tank 23. As a result, hot water heated in the primary flow path of the heat exchanger for remedy 24 flows. Note that the hot water that has cooled down after passing through the heat exchanger for remedy 24 passes through the bottom side of the hot water storage tank 23, is returned to the heat pump unit 2, and is heated again.

  On the other hand, the bath circulation pump 70 is driven to circulate hot water stored in a bathtub (not shown) in the bathtub water circulation passage 62. As a result, the hot water stored in the bathtub (not shown) flows through the secondary flow path of the heat exchanger 24 for remedy. Then, heat is exchanged with the hot water flowing through the heat medium circulation channel 61 inside the heat exchanger for remedy 24, and the hot water flowing into the secondary channel from the bathtub (not shown) is heated. Is done. That is, the amount of heat of the hot water flowing through the heat medium circulation channel 61 is released, and the amount of heat is recovered by the hot water flowing through the bathtub water circulation channel 62. Accordingly, hot water flowing from the bathtub (not shown) toward the heat exchanger for remedy 24 is heated when passing through the heat exchanger 24 for remedy, and the heated hot water is bathed (not shown). Returned to As a result of the continuous operation, the hot water in the bathtub (not shown) is heated to a desired temperature.

  Here, attention is paid to the operation of circulating hot water in the heat medium circulation passage 61.

  In the remedy operation of the present embodiment, as described above, the hot water that has passed through the remedy heat exchanger 24 and has cooled down flows from the high-temperature water supply pipe 63 through the tank water supply pipe 53 through the bottom of the hot water storage tank 23. Will be. At this time, as described above, the baffle plate 36 is formed in the hot water storage tank 23, and the hot water stored on the bottom side in the hot water storage tank 23 is difficult to flow to the top side. Therefore, the hot water newly flowing into the hot water storage tank 23 from the bottom side does not disturb (or hardly disturb) the temperature stratification formed above the baffle plate 36.

  Furthermore, the hot water stored in the region located on the bottom side in the hot water storage tank 23 flows out first when the hot water flows out from the hot water storage tank 23 to the heat pump unit 2 side. In other words, even if the temperature stratification is disturbed only in a part of the bottom side where hot water has newly flown in, the hot water of the portion where the temperature stratification is disturbed flows out to the outside, so the temperature formed above The structure does not disturb (or hardly disturbs) the stratification.

That is, even if the temperature stratification is disturbed only in a part of the region on the bottom side, the temperature stratification is maintained in the other most part, so that the temperature stratification formed throughout the hot water storage tank 23 is greatly affected. There is nothing. In other words, even if the temperature stratification is slightly disturbed in a part of the region on the bottom side, the efficiency of various operations (heat storage operation, general hot water supply operation, drop operation, and memorial operation) is not deteriorated.
Therefore, the hot water supply apparatus 1 according to the present embodiment has a configuration in which even if hot water that has passed through the heat exchanger for remedy 24 flows into the hot water storage tank 23, a decrease in operation efficiency due to disturbance of temperature stratification does not occur. Yes.

Further, at this time, the hot water cooled by passing through the heat exchanger for remedy 24 passes through the bottom side of the hot water storage tank 23 and then returned to the heat pump unit 2.
Here, when the temperature stratification is formed inside the hot water storage tank 23, the portion on the bottom side inside becomes a portion where hot water having a low temperature is stored. Therefore, the hot water that has passed through the memory heat exchanger 24 is mixed with low-temperature hot water when passing through the bottom side of the hot water storage tank 23, and the temperature is lowered. That is, the hot water supply apparatus 1 according to the present embodiment has a structure in which the hot water returned to the heat pump unit 2 can be made into a relatively low temperature hot water. From this, operation with good heating efficiency (COP) is possible as compared with a structure in which hot water with relatively high temperature is returned to the heat pump unit 2 as it is.

  Next, a specific operation of the chasing operation of the present embodiment will be described in detail with reference mainly to FIG.

  When the user operates a remote control (not shown) or the like to request a chasing operation (Yes in Step 1), the heat pump unit 2 is activated (Step 2), and the chasing operation is started.

  At this time, in the three-way valve 49, the flow path is switched so that hot water flows from the heat storage return pipe 46 to the side of the heat exchanger for remedy 24 (step 3). That is, the port to which the tank connection pipe 47 is connected is closed, and the port to which the heat storage return pipe 46 is connected and the port to which the high temperature water supply pipe 63 is connected are opened.

And the heating operation of bathtub water is started (step 4).
Specifically, as described above, the boiling pump 48 and the reheating pump 68 are driven, and hot water is circulated in the heat medium circulation passage 61, whereby the hot water heated by the heat pump unit 2 is subjected to heat exchange for renewal. To the vessel 24. On the other hand, the bath circulation pump 70 is driven to circulate hot water stored in a bathtub (not shown) in the bathtub water circulation flow path 62 and pass through the heat exchanger 24 for remedy. And the hot water which flows through the bathtub water circulation flow path 62 is heated by exchanging heat with the heat exchanger 24 for remembrance.

  Such a bath water heating operation is continued until a stop of the chasing operation is requested (e.g., Yes in step 5), for example, when a user operates a remote controller or the like.

  Then, for example, when the user performs a remote control operation or the like to stop the chasing operation (Yes in Step 5), the bath circulation pump 70 is stopped, and the bathtub ( The circulation of the hot water stored in (not shown) is stopped (step 6).

  Here, the hot water supply apparatus 1 of the present embodiment has a configuration in which the circulation of the hot water in the heat medium circulation passage 61 is not immediately stopped even when the chasing operation is requested to stop. That is, even if the stop of the memorial operation is requested and the circulation of the hot water stored in the bathtub (not shown) in the bathtub water circulation passage 62 is stopped, the predetermined time t1 has passed (in step 7). Until it becomes Yes), the hot water circulation in the heat medium circulation passage 61 is not stopped.

  That is, if the user performs an operation of repeatedly turning on and off the switch within a short time, and the heat pump unit 2 repeatedly starts and stops within a short time, an unexpected problem may occur in the heat pump unit 2. There is sex. Therefore, in the present embodiment, in order to prevent the occurrence of such a problem, even if the stop of the chasing operation is requested, until the predetermined time t1 elapses (until Yes in Step 7), The hot water circulation in the heat medium circulation passage 61 is not stopped. This prevents problems caused by the heat pump unit 2 being repeatedly started and stopped within a short time.

When a predetermined time t1 has elapsed from the request for stopping the chasing operation (Yes in Step 7), the hot water circulation in the heat medium circulation passage 61 is stopped (Step 12), and the chasing operation is stopped.
More specifically, a stop request signal is transmitted to the heat pump unit 2 and the heat pump unit 2 starts to stop. Furthermore, the boiling pump 48 and the retreat pump 68 are stopped, and the circulation of hot water in the heat medium circulation passage 61 is stopped. Further, the flow path is switched so that hot water flows from the heat storage return pipe 46 to the hot water storage tank 23 side. That is, the port to which the high temperature water supply pipe 63 is connected is closed, and the port to which the heat storage return pipe 46 is connected and the port to which the tank connection pipe 47 is connected are opened.

  Further, when the predetermined temperature t1 has elapsed from the request for stopping the chasing operation, the temperature Ta of the hot water discharged from the heat pump unit 2 (the hot water temperature Ta) exceeds the preset hot water storage set temperature Tb (step 7). No, Yes in step 8), the hot water storage tank 23 stores hot water. That is, the flow path is switched so that hot water flows from the heat storage return pipe 46 to the hot water storage tank 23 side (step 9), and hot water flows into the hot water storage tank 23.

More specifically, hot water is heated in the heat pump unit 2 even while the hot water circulation in the heat medium circulation passage 61 is not immediately stopped and is kept waiting until the predetermined time t1 has elapsed. It will be. Therefore, in the present embodiment, the temperature Ta of the hot water discharged from the heat pump unit 2 (the hot water temperature Ta) is a temperature at which hot water can be stored in the hot water storage tank 23, that is, even if the hot water storage tank 23 flows from the top side into When the temperature stratification is not disturbed inside, hot water is introduced into the hot water storage tank 23. As described above, in the hot water supply apparatus 1 of the present embodiment, the heat applied to the hot water during standby until stoppage is not wasted and heat can be stored in the hot water storage tank 23, so that energy efficiency during operation can be improved. .
In the present embodiment, the temperature Ta of the hot water discharged from the heat pump unit 2 is the temperature of the hot water flowing through the heat storage return pipe 46 detected by a temperature sensor (not shown).

  In addition, when hot water is flowing into the hot water storage tank 23 during standby until stoppage, for example, when a remote control or the like is operated by the user, there is a request for starting a chasing operation again (step 10). In the case of Yes), the flow path is switched so that hot water flows from the heat storage return pipe 46 to the reheating heat exchanger 24 side (step 3), and the bath water heating operation is performed (the operation after step 4 is performed) To do).

On the other hand, when hot water is allowed to flow into the hot water storage tank 23 during standby until the stop, there is no request for the start of the chasing operation again by the user (in the case of No in step 10), and the chasing operation is stopped. When the predetermined time t1 elapses (Yes in Step 11), the hot water circulation in the heat medium circulation passage 61 is stopped (Step 12), and the chasing operation is stopped.
That is, as in the case described above, the heat pump unit 2 starts to stop and the hot water circulation in the heat medium circulation flow channel 61 is stopped, so that the hot water flows from the heat storage return pipe 46 to the hot water storage tank 23 side. Switch.

  By the way, as mentioned above, in the hot water supply apparatus 1 of this embodiment, the hot water in the hot water storage tank 23 is utilized when performing a general hot water supply operation or a dropping operation. Further, when performing the memorial operation, the hot water is not discharged from the hot water storage tank 23.

  Here, the temperature of the hot water required for the general hot water supply operation and the dropping operation is about 50 degrees Celsius, whereas the high temperature hot water required for heating the bath water in the memorial operation. The temperature is about 80 degrees Celsius.

  And in the hot water supply apparatus 1 of this embodiment, since hot water in the hot water storage tank 23 is not used in the chasing operation, it is necessary to raise the hot water stored in the hot water storage tank 23 to about 80 degrees Celsius. The hottest hot water in the hot water storage tank 23 can be set to about 50 degrees Celsius. That is, the hot water heated to about 80 degrees Celsius is stored in the hot water storage tank 23 and the memorial operation can be performed. Therefore, efficient operation is possible when general hot water supply operation or drop-in operation is performed.

This will be described in detail with an example. If hot water of 80 degrees Celsius is stored in the hot water storage tank 23, if hot water of 40 degrees Celsius is required, the hot water of 80 degrees Celsius is added to the hot water. It is necessary to mix with low-temperature hot water with the mixing valve 58 to lower the temperature to 40 degrees Celsius. On the other hand, when hot water of 50 degrees Celsius is stored in the hot water storage tank 23, it is only necessary to lower the temperature of the hot water of 50 degrees Celsius to 40 degrees Celsius, and in order to lower the temperature of the hot water, do not need. At this time, the greater the temperature difference between before and after the temperature is lowered, the more heat is wasted.
In the present embodiment, the hottest hot water in the hot water storage tank 23 can be set to a temperature suitable for general hot water supply operation or dropping operation (about 50 degrees Celsius), and when performing the general hot water supply operation or dropping operation, Efficient operation is possible without wasting much heat.

Furthermore, when the hot water stored in the hot water storage tank 23 is at a higher temperature, the hot water is kept in the hot water storage tank 23 or when various operations such as a general hot water supply operation and a dropping operation are performed. Heat loss will increase.
In the present embodiment, since the hottest hot water in the hot water storage tank 23 can be set to about 50 degrees Celsius, an efficient operation without a large heat loss is possible.

  In the hot water supply apparatus 1 of the present embodiment, the hot water supply pipe 63 is connected to the middle part of the tank water supply pipe 53, and the hot water having cooled down after passing through the heat exchanger 24 for reheating is stored in the hot water storage tank via the tank water supply pipe 53. 23. According to such a configuration, compared to a configuration in which one end of a pipe (high-temperature water supply pipe 63 in the above-described embodiment) extending through the heat exchanger for remedy 24 is directly connected to the hot water storage tank 23, The number of pipes connected to the tank 23 can be reduced. For this reason, it is not necessary to form many pipe connection ports in the hot water storage tank 23, which is desirable because the structure of the hot water storage tank 23 can be simplified.

  Further, according to the configuration in which the high temperature water supply pipe 63 is connected to the middle part of the tank water supply pipe 53, when the hot water is circulated in the heat medium circulation passage 61, It will flow through the tank water supply pipe 53. Here, the hot water that has passed through the heat exchanger for remedy 24 is a low-temperature hot water, but is usually a hot water that is hotter than hot water supplied from a water supply source (not shown). For this reason, when hot water is circulated in the heat medium circulation passage 61, hot water flows through the tank water supply pipe 53 more than when hot water flowing from a water supply source (not shown) is supplied to the hot water storage tank 23. From this, it becomes possible to warm the tank water supply pipe 53 simply by circulating hot water in the heat medium circulation passage 61, and when the hot water supply apparatus 1 is used in a cold district or the like, the liquid in the tank water supply pipe 53 can be heated. Freezing can be prevented.

  That is, the hot water supply apparatus 1 of the present embodiment is based on the condition that the hot water flowing into the water inlet pipe 52 from the external water source is detected to be equal to or lower than the predetermined temperature by the water inlet temperature sensor provided in the water inlet pipe 52 or the like. As a result, it is possible to perform an anti-freezing operation in which hot water is circulated in the heat medium circulation passage 61. In other words, when the hot water flowing into the inlet pipe 52 is below a predetermined temperature, the flow path including the high temperature water supply pipe 63 by driving the heat pump unit 2, the boiling pump 48 (and / or the additional pump 68), etc. It is possible to carry out anti-freezing operation in which hot hot water is circulated. By performing the freeze prevention operation, it is possible to prevent liquid freezing in the pipe in a predetermined part of the tank water supply pipe 53.

In the above-described embodiment, the example in which the hot water stored in the bathtub (not shown) is heated by the heat of the hot water circulating through the heat medium circulation passage 61 is shown, but the present invention is not limited to this.
For example, a heat exchanger for heating may be provided in the heat medium circulation flow path 61, and a pipe forming the heat medium circulation flow path 61 may be connected to the primary flow path of the heating heat exchanger. That is, the heat medium circulation channel 61 may be a circulation channel including the primary side channel of the heating heat exchanger. At this time, a circulation passage including the heating device and the secondary passage of the heating heat exchanger is formed to form a circulation passage for heating, and a heating medium such as hot water (or antifreeze) is used as the circulation passage for heating. You may circulate with. That is, the heat medium flowing in the secondary flow path of the heating heat exchanger may be heated by hot hot water flowing in the heat medium circulation flow path 61. In other words, the amount of heat of the hot water flowing through the heat medium circulation passage 61 is released, and the amount of heat may be recovered by the hot water flowing through the heating circulation passage.

That is, the hot water supply apparatus 1 of the present embodiment branches the heat medium circulation flow path 61 of the above-described embodiment, and the circulation flow path to which the primary flow path of the heat exchanger for remedy 24 is connected, You may form so that the circulation flow path to which the primary side flow path of the heat exchanger for heating was connected may be paralleled. In other words, the circulation flow path extending including the primary flow path of the memorial heat exchanger 24 and the circulation flow path extending including the primary flow path of the heating heat exchanger are formed in parallel. Also good.
In addition, instead of the heat medium circulation channel 61 of the above-described embodiment, a circulation channel to which the primary channel of the heating heat exchanger is connected, in other words, the primary channel of the heating heat exchanger. A circulation flow path that extends inclusive may be formed.

  In this case, in order to heat the heat medium to such an extent that heat can be supplied to the heating device, it is necessary to heat the hot water flowing through the heat medium circulation passage 61 to about 65 degrees Celsius. However, since the hot water heated by the heat pump unit 2 is supplied to the heating heat exchanger without passing through the hot water storage tank 23, the hot water for heating is provided inside the hot water storage tank 23 in the same manner as described above. There is no need to store (about 65 degrees Celsius hot water). That is, among the hot water stored in the hot water storage tank 23, the hot water temperature that is the highest temperature can be stopped at a temperature (about 50 degrees Celsius) required for the general hot water supply operation or the dropping operation. As a result, as in the case described above, efficient operation without large heat loss is possible.

In the above-described embodiment, an example is shown in which the boiling pump 48 and the remnant pump 68 are provided in the heat medium circulation passage 61 and both are driven to circulate hot water. However, the present invention is not limited to this.
A configuration may be adopted in which hot water is circulated in the heat medium circulation passage 61 by driving only the boiling pump 48 without providing the remedy pump 68.

The heat storage operation described above is an operation that is performed on condition that the temperature of the hot water flowing through the heat storage return pipe 46 detected by a temperature sensor (not shown) is equal to or higher than a predetermined temperature.
Here, when the temperature of the hot water flowing through the heat storage return pipe 46 is low, when hot water is introduced into the hot water storage tank 23 through the tank connection pipe 47, hot water having a low temperature flows from the top of the hot water storage tank 23. There is a possibility that the temperature stratification formed inside the tank 23 is disturbed.
Therefore, when the temperature of the hot water flowing through the heat storage return pipe 46 is low, hot water flows from the heat storage return pipe 46 side to the high-temperature water supply pipe 63 and the hot water storage tank is connected via the tank water supply pipe 53, as in the memory operation. Hot water may flow into the bottom side of 23 (see FIG. 5). That is, when the temperature of hot water flowing through the heat storage return pipe 46 is low, the heat storage operation may be performed in which the flow path is switched by the three-way valve 49 and hot water is supplied to the high temperature water supply pipe 63. In this case, since the hot water in the bathtub (not shown) is not circulated in the bathtub water circulation pipe 64, the hot water that has passed through the heat exchanger for remedy 24 is not lowered in temperature by heat exchange. Then, when it is confirmed that the temperature of the hot water flowing through the heat storage return pipe 46 has risen, the three-way valve 49 may switch the flow path, and the above-described normal heat storage operation may be performed.

  The memorial operation of the present embodiment is not limited to the above-described operation. For example, an operation in which heated hot water flows into the hot water storage tank 23 during the memorial operation may be performed. That is, the memorial operation and the heat storage operation may be performed in parallel.

  More specifically, in this operation, the heat input side temperature sensor 75 is provided in the high temperature water supply pipe 63 on the upstream side in the hot water flow direction from the reheating heat exchanger 24, and the reheating heat exchanger 24 is provided. A heat output side temperature sensor 76 is provided further downstream in the hot water flow direction. And it is set as the structure which can detect the temperature of the hot water which flows into the primary side flow path of the memorial heat exchanger 24, and the temperature of the hot water after passing the primary side flow path of the memorial heat exchanger 24.

When the temperature of the hot water detected by the heat exchange side temperature sensor 75 is equal to or higher than the hot water storage set temperature Tb and the temperature of the hot water detected by the heat exchange side temperature sensor 76 is equal to or higher than the predetermined temperature Tα, the additional temperature is increased. The operation which performs dredging operation and heat storage operation in parallel is started.
Specifically, at this time, it is confirmed from the value detected by the heat input side temperature sensor 75 that the temperature stratification is not disturbed even if hot water flows into the hot water storage tank 23 from the top. The temperature detected by the heat exchanging temperature sensor 76 indicates that the temperature of the hot water that has passed through the heat exchanger 24 for reheating is sufficiently high and is still above the predetermined temperature Tα even though heat is released in the heat exchange. It is confirmed that there is a certain state, that is, a so-called heat surplus state. Then, on the condition that these have been confirmed, an operation for performing the memorial operation and the heat storage operation in parallel is started.

  When this operation is started, all three ports of the three-way valve 49 are opened. That is, hot water can flow from the heat storage return pipe 46 to the tank connection pipe 47, and hot water can flow from the heat storage return pipe 46 to the high temperature water supply pipe 63. In this state, the same operation as the above-described chasing operation is performed. Then, a part of the high-temperature hot water that has passed through the heat storage return pipe 46 is supplied to the primary flow path of the heat exchanger 24 for remedy without passing through the hot water storage tank 23. Further, the remaining portion of the hot hot water flows from the top of the hot water storage tank 23 through the tank connection pipe 47. As a result, the memorial operation and the heat storage operation are performed in parallel.

1 Hot water supply device (heat pump type hot water supply device)
2 Heat pump unit (heat pump device)
12 Circulation path 13 Expansion valve (expansion means)
14 Evaporator (evaporation means)
15 Compressor (compression means)
16 Condenser (condensing means)
23 Hot water storage tank 24 Heat exchanger for remembrance (heat exchanger)
36 Baffle plate 53 Tank water supply pipe 63 High temperature water supply pipe (hot water supply flow path)

Claims (3)

A heat pump device having a circulation path in which the expansion means, the evaporation means, the compression means, and the condensation means are connected in an annular shape, and circulates the heat medium in the circulation path;
A hot water storage tank that can store hot water heated by the heat pump device from the top side, and can store hot water in a state in which temperature stratification is formed inside,
A heat pump type hot water supply apparatus comprising a heat exchanger for exchanging heat by passing hot water heated by the heat pump device through a primary channel,
Hot water supplied by the heat pump device has a hot water supply flow path that can supply the heat exchanger without passing through the hot water storage tank,
Hot water heated by the heat pump device and supplied to the primary flow path of the heat exchanger by the hot water supply flow path is allowed to flow from the bottom of the hot water storage tank after passing through the heat exchanger, and the hot water storage tank A heat pump type hot water supply apparatus, wherein the heat pump type hot water supply apparatus flows out to the heat pump apparatus side after passing through a bottom side portion of the heat pump. It has a tank water supply pipe for supplying hot water from an external water supply source into the hot water storage tank, and one end of the tank water supply pipe is connected to the bottom of the hot water storage tank,
The hot water supply flow path is connected to the tank water supply pipe, and hot water that has passed through the primary side flow path of the heat exchanger flows into the hot water storage tank through the tank water supply pipe. The heat pump type hot water supply apparatus described in 1.   The heat pump hot water supply apparatus according to claim 1 or 2, wherein a baffle plate is provided inside the hot water storage tank to restrict movement of hot water stored on the bottom side to the top side.

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