JP3740718B2 - Hot water storage water heater - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hot water storage type hot water supply apparatus that recovers waste heat of a bath.
[0002]
[Prior art]
Conventionally, this type of hot water storage type hot water supply apparatus is disclosed in Japanese Patent Laid-Open No. 4-106370. In FIG. 4, when there is remaining hot water in the bathtub 1, the remaining hot water is passed through the heat exchanging unit 3 by the operation of the circulation pump 2 and taken into the water heat exchange tank 5 by the operation of the bath circulation pump 4. After the heat exchange and residual heat, it is returned to the lower chamber 6b of the hot water tank 6. Then, heat is condensed in the first heat exchanger 8 using the heat of condensation from the compressor 7 and heated in both the upper and lower chambers 6a and 6b in the hot water tank 6 over time.
[0003]
[Problems to be solved by the invention]
However, in the configuration as described above, the water heated by the heat exchange with the remaining hot water returns to the lower chamber 6b of the hot water tank 6 and flows into the heat exchanging unit 3 again, so that the water temperature of the lower chamber 6b increases with time. However, heat exchange is difficult. Moreover, since the amount of remaining hot water in the bathtub 1 is used for preheating the entire hot water tank 6, it may become wasteful preheating. In particular, since the hot water supply load is small in summer, it is not necessary to heat the entire hot water tank 6, and it is sufficient to store the amount of hot water corresponding to the load, but the remaining hot water calorie is used for the water in the entire hot water tank. The water temperature rises as a whole.
[0004]
For example, when the hot water tank capacity is 370 liters, the remaining hot water temperature of the bath is 38 ° C., 180 liters, the hot water supply load is 250 liters of hot water of 65 ° C., and the feed water temperature is 25 ° C., (38-25) × 180 × 4.186 = 9795 kJ The remaining hot water can be recovered. When this remaining hot water heat amount is given to a hot water supply load of 250 liters, the water supply temperature rises by 9795 / (250 × 4.186) = 9.4 deg. That is, in order to obtain a hot water temperature of 65 ° C., the temperature is increased by 55.6 deg. However, in the above configuration, since the remaining hot water is used for the entire hot water storage tank capacity of 370 liters, only an effect of raising the feed water temperature of 9795 / (370 × 4.186) = 6.3 deg can be obtained. Reheating is necessary, and the remaining hot water is not used effectively.
[0005]
This invention solves such a conventional subject, and makes it the 1st objective to collect | recover the waste heat of a bath efficiently.
[0006]
The second purpose is to increase the bath heating capacity and shorten the heating time.
[0007]
A third object is to improve the convenience of the bath heating operation.
[0008]
[Means for Solving the Problems]
To achieve the first object of the present invention, a hot water tank, a circulation pump, a bath heat exchanger, and a hot water supply circuit sequentially connected to a heater, a bathtub, a bath circulation pump, and heat that exchanges heat with the bath heat exchanger. Based on the signal of the first temperature detection means such that the bath circulation circuit to which the exchange unit is connected, the first temperature detection means provided downstream of the heater, and the outlet temperature of the heater become a predetermined temperature. A rotation controller for controlling the rotation of the circulation pump, and the water flowing out from the lower part of the hot water tank is heated by the bath heat exchanger, and then heated to a predetermined high temperature by the heater and from the upper part of the hot water tank. When the hot water is stored in the hot water storage tank and the remaining hot water amount of the bath circulation circuit cannot be recovered, the bath circulation pump is stopped, and the hot water storage type hot water supply device that continues the hot water storage operation by the heater alone is provided.
[0009]
In addition, a hot water tank, a circulation pump, a bath heat exchanger, a hot water supply circuit sequentially connected to the heater, a bath, a bath circulation pump, a bath circulation circuit connected to the bath heat exchanger and a heat exchange unit that performs heat exchange, Rotation control for controlling the rotation of the circulation pump based on a signal of the first temperature detection means provided downstream of the heater and the first temperature detection means so that the outlet temperature of the heater becomes a predetermined temperature , Second temperature detection means provided upstream of the bath heat exchanger, third temperature detection means provided downstream of the bath heat exchanger or upstream of the heat exchange unit, and second temperature detection means And a controller for controlling energization of the bath circulation pump from a signal generated by the third temperature detecting means, and the water flowing out from the lower part of the hot water storage tank is heated by the bath heat exchanger and then heated. Heated to a predetermined high temperature When the hot water is stored in the hot water tank from the upper part of the hot water storage tank, and the signal of the third temperature detecting means shows substantially the same temperature as the signal of the second temperature detecting means, the bath circulation pump is stopped, and the heater alone Thus, a hot water storage type hot water supply device that continues hot water storage operation is provided.
[0010]
In order to achieve the second object of the present invention, a hot water storage tank, a forward / reverse circulation pump capable of forward / reverse circulation, a bath heat exchanger, a hot water supply circuit sequentially connected with a heater, a bathtub, and a bath circulation pump , and a bath circulation circuit connecting a heat exchanger for performing the bath heat exchanger and the heat exchanger, the driving rotation of the pre-Symbol forward and reverse circulation pump in the forward direction during hot water storage operation, said at a bath reheating operation The hot water storage type hot water supply apparatus operates in the reverse direction of the rotation of the forward / reverse circulation pump.
[0011]
In order to achieve the third object of the present invention, a hot water storage tank, a forward / reverse circulation pump whose circulation direction is forward / reverse, a bath heat exchanger, a hot water supply circuit in which a heater is sequentially connected, and a bathtub, a bath circulation pump , a bath circulation circuit connecting a heat exchanger that performs heat exchange the bath heat exchanger, said and a hot water detecting means provided in the hot water storage tank, the positive direction of rotation of the front Symbol forward and reverse circulation pump during hot water storage operation those driving, at the time of the bath reheating operation and the hot water detecting means hot water storage type hot water supply apparatus having a controller for controlling the heater based on a signal with driving the rotation of the forward and reverse circulation pump in the reverse direction It is.
[0012]
[Action]
According to the present invention, the low temperature water flowing out from the lower part of the hot water storage tank flows into the bath heat exchanger by the operation of the circulation pump. Here, the remaining hot water in the bathtub sent by the operation of the bath circulation pump is heated through the heat exchanging unit, and then flows into the heater and further heated to the hot water. Then, the rotation speed controller controls the rotation speed of the circulation pump based on the signal of the first temperature detection means so that the outlet temperature of the heater becomes a predetermined temperature. And the hot water which flowed out of the heater is gradually stored from the upper part of the hot water tank. On the other hand, the temperature of the water in the bath circulation circuit system that has dissipated heat in the heat exchanger gradually decreases. The temperature of the water flowing into the bath heat exchanger is detected by the second temperature detecting means, and the temperature of the water at the outlet of the bath heat exchanger or the temperature of the water flowing into the heat exchanging section is detected by the third temperature detecting means. Is sent to the controller. And if the signal of a 3rd temperature detection means shows the same temperature as the signal of a 2nd temperature detection means here, that is, when the amount of remaining hot water cannot be collect | recovered, energization of a bath circulation pump will be stopped. And the hot water storage operation is continued with the heater alone, and the required amount of hot water is stored in the hot water storage tank. Therefore, the water heated by the remaining hot water in the bathtub is heated to a higher temperature by the heater and stored in the upper part of the hot water tank, so that the remaining hot water is used for the amount of hot water stored in the hot water tank. Efficient bath waste heat recovery operation is possible.
[0013]
In addition, during the hot water storage operation, the circulation pump is operated by rotating in the forward direction, the rotation controller receives the signal from the temperature detection means so that the outlet temperature of the heater becomes a predetermined temperature, and the rotation controller performs rotation control of the circulation pump, Hot water is stored in the upper part of the hot water tank. On the other hand, at the time of bathing operation, the controller operates the circulation pump in the reverse rotation direction, allows hot water to flow from the upper part of the hot water tank into the bath heat exchanger via the heater, and passes through the heat exchange unit to the bathtub. The water sent from is heated. Therefore, since the hot water in the hot water tank is used for heating, the bath reheating time is shortened and the convenience of the device is improved.
[0014]
In addition, the controller operates the circulation pump in the reverse rotation direction during the bath chasing operation, allowing hot water to flow from the upper part of the hot water tank through the heater and into the bath heat exchanger, and from the bathtub through the heat exchanger. Heat the sent water. Then, the hot water amount detecting means detects that the amount of hot water in the hot water tank has decreased, sends a signal to the controller, and the controller energizes the heater. And the hot water heated with the heater flows in into a bath heat exchanger, and heats the water sent from the bathtub through the heat exchange part. Therefore, even when hot water is exhausted in the hot water tank, the bath chasing operation can be performed, which improves the convenience of the device. In addition, since it can be configured with a simple piping configuration and a small number of parts, it is possible to reduce the capacity of the hot water storage tank and save space.
[0015]
【Example】
A first embodiment of the present invention will be described below with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.
[0016]
9 is a bath heater, 10 is a heater, and a heater or the like is a heat source. And it connects to the lower part of the hot water tank 6, the circulation pump 2, the bath heat exchanger 9, the heater 10, and the upper part of the hot water tank 6 in order, and comprises a hot water supply circuit. Reference numeral 11 denotes a heat exchange unit, which exchanges heat with the bath heat exchanger 9. The bathtub 1, the bath circulation pump 4, and the heat exchange unit 11 constitute a bath circulation circuit. Reference numeral 12 denotes first temperature detection means, which is provided downstream of the heater 10 and generates a signal based on the detected temperature of the fluid flowing therethrough. A rotation controller 13 receives a signal from the first temperature detection means 12 and controls the rotation of the circulation pump 4. Reference numeral 14 denotes a second temperature detecting means, which is provided upstream of the bath heat exchanger 9 and generates a signal based on the detected temperature of the fluid flowing therethrough. Reference numeral 15 denotes third temperature detecting means, which is provided downstream of the bath heat exchanger 9 or upstream of the heat exchanging section 11, and generates a signal based on the detected temperature of the fluid flowing therethrough. 16 controller, the operation of the bath circulation pump 6 is stopped when the signal generated by the third temperature detecting means 15 indicates substantially the same temperature as the signal generated by the second temperature detecting means 14.
[0017]
In the above configuration, the low-temperature water flowing out from the lower part of the hot water tank 6 flows into the bath heat exchanger 9 by the operation of the circulation pump 2. Here, the remaining hot water of the bathtub 1 sent by the operation of the bath circulation pump 4 is heated through the heat exchanging portion 11, and then flows into the heater 10 and further heated to hot water. Then, the rotation controller 13 controls the rotation of the circulation pump 2 based on the signal of the first temperature detection means 12 so that the outlet temperature of the heater 10 becomes a predetermined temperature. And the hot water which flowed out of the heater 10 is gradually stored from the upper part of the hot water storage tank 6. On the other hand, the temperature of the water in the bath circulation circuit system that has dissipated heat in the heat exchange unit 11 gradually decreases. Then, the water temperature of the hot water supply circuit system flowing into the bath heat exchanger 9 and the water temperature of the bath circulation circuit system are detected by the second temperature detection means 14 and the third temperature detection means 15, and the signals are sent to the controller 16. . Here, when the signal from the third temperature detection means 15 shows substantially the same temperature as the signal from the second temperature detection means 14, that is, when the remaining hot water heat cannot be recovered, the operation of the bath circulation pump 4 is stopped. . Then, the hot water storage operation is continued with the heater 10 alone, and the necessary amount of hot water is stored in the hot water storage tank 6. Therefore, the water heated by the remaining hot water in the bathtub is heated to a higher temperature by the heater 10 and stored in the upper part of the hot water storage tank 6, so that the remaining hot water calorie is completely equal to the amount of hot water stored in the hot water storage tank. As a result, the waste heat recovery operation can be performed efficiently and energy saving can be achieved. Here, even when the third temperature detection means 15 is provided downstream of the bath heat exchanger 9 in the hot water supply circuit system, if the remaining hot water amount in the bathtub 1 cannot be recovered, the signal of the third temperature detection means 15 Since the signal of the second temperature detecting means 14 indicates substantially the same temperature, the same effect can be obtained.
[0018]
Next, a second embodiment will be described with reference to FIG. Components having the same functions as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 17 denotes a forward / reverse circulation pump capable of reversing the circulation direction in the forward direction A and the reverse direction B. The lower part of the hot water tank 6, the forward / reverse circulation pump 17, the bath heat exchanger 9, the heater 10 and the hot water tank 6. The hot water supply circuit is configured by being sequentially connected to the upper part of the water heater.
[0019]
In the above configuration, during the hot water storage operation, the forward / reverse circulation pump 17 is operated in the forward direction A, and the rotation controller 13 receives the signal from the temperature detecting means 12 so that the outlet temperature of the heater 10 becomes a predetermined temperature. The rotational speed of the reverse circulation pump 17 is controlled, and hot water is stored in the upper part of the hot water storage tank 6. On the other hand, at the time of bathing operation, the controller 16 operates the forward / reverse circulation pump 17 in the reverse direction B, causing hot water to flow from the upper part of the hot water tank 6 through the heater 10 into the bath heat exchanger 9 to exchange heat. The water sent from the bathtub 1 through the part 11 is heated. Therefore, since it heats with the hot water in the hot water tank 6, the bath reheating time is shortened and the convenience of the apparatus is improved.
[0020]
Next, a third embodiment will be described with reference to FIG. Components having the same functions as those of the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 18 denotes hot water amount detection means, which is provided in the hot water storage tank 6.
[0021]
In the above configuration, the controller 16 operates the forward / reverse circulation pump 17 in the reverse rotation direction B during the bath chasing operation, and allows hot water to flow from the upper part of the hot water tank 6 through the heater 10 into the bath heat exchanger 9. The water sent from the bathtub 1 through the heat exchange unit 11 is heated. Then, the amount of hot water in the hot water storage tank 6 is detected by the hot water amount detection means 18, a signal is sent to the controller 16, and the controller 16 energizes the heater 10. And the hot water heated with the heater 10 flows in into the bath heat exchanger 9, and heats the water sent from the bathtub 1 via the heat exchange part 11. As shown in FIG. Therefore, even when the hot water in the hot water storage tank 6 runs out, the bath chasing operation is possible, and the convenience of the device is improved. In addition, since a reliable reheating function can be realized with a simple piping configuration and the number of parts, the capacity of the hot water tank can be reduced and space can be saved.
[0022]
【The invention's effect】
As is clear from the above description, according to the hot water storage type hot water supply apparatus of the present invention, the water heated by the remaining hot water in the bathtub is heated to a higher temperature by the heater and stored in the upper part of the hot water tank. The amount of heat is used for the amount of hot water stored in the hot water storage tank, and an efficient bath waste heat recovery operation can be performed.
[0023]
Moreover, since the water sent from the bathtub via the heat exchange part is heated with the high temperature hot water in the hot water storage tank, the bath replenishment time is shortened and the convenience of the device is improved.
[0024]
In addition, the amount of hot water in the hot water tank is detected by the hot water detection means, a signal is sent to the controller, and the controller energizes the heater so that the hot water tank can be used even when there is no hot water in the hot water tank. The reheating operation is possible and the convenience of the equipment is improved, and a reliable reheating function can be realized with a simple piping configuration and the number of parts, so that the capacity of the hot water storage tank can be reduced and the space can be saved.
[Brief description of the drawings]
FIG. 1 is a block diagram of a hot water storage type hot water supply apparatus according to a first embodiment of the present invention. FIG. 2 is a block diagram of a hot water storage type hot water supply apparatus according to a second embodiment of the present invention. Configuration diagram of a hot water storage type hot water supply apparatus in the embodiment [FIG. 4] Configuration diagram of a conventional hot water storage type hot water supply apparatus
DESCRIPTION OF SYMBOLS 1 Bathtub 2 Circulation pump 4 Bath circulation pump 6 Hot water storage tank 9 Bath heat exchanger 10 Heater 11 Heat exchange part 12 1st temperature detection means 13 Rotation controller 14 2nd temperature detection means 15 3rd temperature detection means 16 Controller 17 Forward / reverse circulation pump 18 Hot water detection means

Claims (4)

A hot water supply circuit in which a hot water tank, a circulation pump, a bath heat exchanger, and a heater are sequentially connected, a bath, a bath circulation pump, a bath circulation circuit in which a heat exchanging unit that exchanges heat with the bath heat exchanger is connected, and the heating A first temperature detecting means provided downstream of the heater, and a rotation controller for controlling the rotation of the circulation pump based on a signal of the first temperature detecting means so that the outlet temperature of the heater becomes a predetermined temperature; The water flowing out from the lower part of the hot water tank is heated by the bath heat exchanger and then heated to a predetermined high temperature by the heater and stored in the hot water tank from the upper part of the hot water tank. A hot water storage type hot water supply device that stops the bath circulation pump when the amount of remaining hot water heat cannot be recovered, and continues the hot water storage operation with the heater alone. A hot water supply circuit in which a hot water tank, a circulation pump, a bath heat exchanger, and a heater are sequentially connected, a bath, a bath circulation pump, a bath circulation circuit in which a heat exchanging unit that exchanges heat with the bath heat exchanger is connected, and the heating A first temperature detecting means provided downstream of the heater, and a rotation controller for controlling the rotation of the circulation pump based on a signal from the first temperature detecting means so that the outlet temperature of the heater becomes a predetermined temperature ; , Second temperature detection means provided upstream of the bath heat exchanger, third temperature detection means provided downstream of the bath heat exchanger or upstream of the heat exchange unit, the second temperature detection means, and the e Bei and a controller for controlling the energization of the bath circulation pump from occurring signal of the third temperature sensing means, after the water flowing out from the hot water tank bottom is heated by the bath heat exchanger, the heater Is heated to a predetermined high temperature and stored. When the hot water is stored in the hot water storage tank from the upper part of the tank and the signal of the third temperature detecting means shows substantially the same temperature as the signal of the second temperature detecting means, the bath circulation pump is stopped, and the heater alone stores hot water. A hot water storage system that keeps operating . Hot water storage tank, forward / reverse circulation pump capable of forward / reverse circulation, bath heat exchanger, hot water supply circuit connected sequentially with heater, bathtub, bath circulation pump, heat exchange part for heat exchange with the bath heat exchanger and a bath circulation circuit connected, drove the rotation of the pre-Symbol forward and reverse circulation pump in the forward direction during hot water storage operation, the hot-water storage type hot water during a bath reheating operation for driving the rotation of the forward and reverse circulation pump in the opposite direction apparatus. Hot water storage tank, forward / reverse circulation pump capable of forward / reverse circulation, bath heat exchanger, hot water supply circuit connected sequentially with heater, bathtub, bath circulation pump, heat exchange part for heat exchange with the bath heat exchanger and bath circulation circuit connected, said and a hot water detecting means provided in the hot water storage tank, drove the rotation of the pre-Symbol forward and reverse circulation pump in the forward direction during hot water storage operation, said at a bath reheating operation forward and reverse circulating pump A hot water storage type hot water supply apparatus provided with a controller that controls the heater based on a signal from the hot water amount detecting means while operating in a reverse direction.

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