JP5915684B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus.

  Conventionally, as a hot water supply device, when switching from bath chasing operation for chasing hot water in a bathtub to boiling operation for boiling hot water in a hot water storage tank, a bath chasing circuit for chasing hot water in the bathtub is used. Some return hot water and hot water from a hot water storage tank are mixed by a mixing valve and flow into a boiling circuit (see, for example, Japanese Patent Application Laid-Open No. 2012-255587 (Patent Document 1)). In the above hot water supply device, when switching from bath recuperation operation to boiling operation, the mixing ratio of the return hot water from the bath reheating circuit and the hot water from the bottom of the hot water storage tank is changed stepwise to enter the heat pump unit. The rapid decrease in temperature is suppressed.

Japanese Patent Laying-Open No. 2012-255587 (FIG. 6)

  In such a hot water supply apparatus having a mixing valve that mixes the return hot water from the bath reheating circuit and the hot water from the lower part of the hot water storage tank, the applicant can The return water and hot water from the lower part of the hot water storage tank are mixed by a mixing valve to lower the incoming water temperature to the heat pump unit, while the hot water heated by the boiling heat exchanger is used to reheat the bath through the upper part of the hot water tank. The hot water supply apparatus which can improve the boiling efficiency of a heat pump unit by supplying it to was considered. In addition, this hot water supply apparatus is demonstrated in order to make this invention easy to understand, and is not a well-known technique and is not a prior art.

  However, in a hot water supply apparatus that performs a bath chasing operation while mixing the return hot water from the bath chasing circuit and hot water from the lower part of the hot water storage tank by a mixing valve, the bath chasing operation is performed without mixing by the mixing valve. Since the flow rate supplied to the recuperation heat exchanger is smaller than the case, there is a problem that the efficiency of heat exchange with the bath water is deteriorated and the bath replenishment ability is lowered.

  Then, the subject of this invention is providing the hot-water supply apparatus which can prevent the fall of a bath chasing capability by controlling the hot water temperature of a boiling heat exchanger at the time of bath chasing operation.

In order to solve the above problems, the hot water supply apparatus of the present invention is:
A hot water storage tank,
A boiling circuit connected from the lower part of the hot water storage tank to the upper part of the hot water storage tank via a boiling heat exchanger;
A bath reheating circuit connected from the upper part of the hot water storage tank to the incoming side of the boiling heat exchanger via a reheating heat exchanger;
A boiling pump disposed in the boiling circuit;
A heat pump unit for boiling hot water in the hot water storage tank by the boiling heat exchanger;
A tapping temperature sensor for detecting tapping temperature of the boiling heat exchanger;
A controller for controlling the boiling pump and the heat pump unit,
The control device controls the boiling pump and the heat pump unit to circulate hot water with the boiling pump through the upper part of the hot water storage tank , the additional heat exchanger, and the boiling heat exchanger. When performing bath chasing operation, the hot water temperature of the boiling heat exchanger detected by the hot water temperature sensor is used to determine the boiling temperature during boiling operation for boiling hot water in the hot water storage tank. It is characterized in that it is lower than the boiling target hot water temperature of the upper heat exchanger , and the circulation flow rate to the additional heat exchanger is increased as compared with the boiling operation .

  According to the above configuration, the boiling pump and the heat pump unit are controlled by the control device, and the hot water is circulated by the boiling pump through the hot water storage tank, the reheating heat exchanger, and the boiling heat exchanger, thereby reheating the bath. When performing bath chasing operation, the hot water temperature of the boiling heat exchanger detected by the hot water temperature sensor is higher than the hot water temperature of the boiling heat exchanger during boiling operation for boiling hot water in the hot water storage tank. make low. As a result, the amount of hot water supplied to the boiling heat exchanger is increased by increasing the amount of hot water from the boiling heat exchanger during bath chase operation, so that the hot water temperature of the boiling heat exchanger is lowered to some extent. However, the heat exchange efficiency in the memory heat exchanger is improved. In this way, by controlling the hot water temperature of the boiling heat exchanger during bath chase operation, it is possible to prevent a decrease in bath chase performance.

Moreover, in the hot water supply apparatus of one embodiment,
The control device, when the bath Tsui焚operation, hot water temperature detected by the hot water temperature sensor, so that is lower than the heating-up target hot water temperature at the time on the boiling operation, the rotation speed of the boiling pump To control.

  According to the above embodiment, during the bath chase operation, the control device rotates the boiling pump so that the tapping temperature detected by the tapping temperature sensor is lower than the boiling target tapping temperature during the boiling operation. Since the number is controlled, it becomes possible to accurately control the tapping temperature of the boiling heat exchanger suitable for heat exchange in the recuperation heat exchanger.

Moreover, in the hot water supply apparatus of one embodiment,
The control device drives the boiling pump at a preset number of rotations, thereby controlling the boiling temperature of the boiling heat exchanger detected by the boiling temperature sensor during the bath chase operation. It is made lower than the boiling target tapping temperature of the boiling heat exchanger during operation.

According to the above embodiment, the boiling temperature of the boiling heat exchanger detected by the tapping temperature sensor during the bath chase operation is increased by driving the boiling pump at a preset rotation speed by the control device. It becomes possible by simple control to make it lower than the boiling target tapping temperature of the boiling heat exchanger during operation.

Moreover, in the hot water supply apparatus of one embodiment,
A mixing valve that mixes hot water returning from the upper part of the hot water storage tank through the additional heat exchanger and hot water from the lower part of the hot water storage tank into the boiling heat exchanger during bath bathing operation; Prepared.

  According to the above embodiment, during the bath chasing operation, hot water returning from the upper part of the hot water storage tank via the memorial heat exchanger and hot water from the lower part of the hot water tank are mixed by the mixing valve, and the boiling point is raised from the mixing valve. By supplying mixed water to the heat exchanger, the temperature of water entering the boiling heat exchanger of the heat pump unit is lowered, and the hot water boiled by the boiling heat exchanger is replenished in the bath through the upper part of the hot water storage tank. Since it is supplied to the circuit, the heating efficiency of the heat pump unit can be improved.

Moreover, in the hot water supply apparatus of one embodiment,
The control device is based on at least one of an incoming temperature of the boiling heat exchanger, a return hot water temperature of the bath heating circuit, and a hot water bath temperature in the bath tub during the bath chase operation. , Controlling the mixing valve.

  According to the above embodiment, the mixing valve is controlled based on at least one of the incoming water temperature of the boiling heat exchanger, the return hot water temperature of the bath reheating circuit, and the hot water bath temperature in the bath tub. Heat is exchanged so that the heating efficiency of the heat pump unit is improved while mixing the hot water from the lower part of the hot water storage tank with the return water of the bath reheating circuit by the valve, while preventing the deterioration of the bath reheating capacity. The water temperature of the vessel can be lowered to the optimum temperature.

  As apparent from the above, according to the present invention, when performing the bath chase operation, the hot water temperature of the hot heat exchanger detected by the hot water temperature sensor is used to raise the hot water in the hot water storage tank. By controlling the hot water temperature of the boiling heat exchanger so as to be lower than the hot water temperature of the boiling heat exchanger at the time, it is possible to realize a hot water supply apparatus that can prevent a decrease in bath reheating ability.

FIG. 1 shows a piping system diagram of a heat pump type hot water supply apparatus according to the first embodiment of the present invention. FIG. 2 is a control block diagram of the hot water supply apparatus. FIG. 3 is a flowchart for explaining the operation of the bath chasing operation using the heat pump unit by the bath chasing control unit of the controller for the hot water supply apparatus. FIG. 4 is a flowchart following FIG. FIG. 5 is a diagram showing changes in the hot water temperature, the incoming water temperature, and the bath temperature during the bath chasing operation of the hot water supply apparatus. FIG. 6 is a flowchart for explaining the operation of the bath chasing operation by the bath chasing control unit using the heat pump unit of the control device of the heat pump type hot water supply apparatus of the second embodiment of the present invention. FIG. 7 is a diagram showing changes in the hot water temperature, the incoming water temperature, the bath temperature, and the number of rotations of the boiling circulation pump during the bath chasing operation of the hot water supply apparatus.

  Hereinafter, a hot water supply apparatus of the present invention will be described in detail with reference to embodiments shown in the drawings.

[First Embodiment]
FIG. 1 shows a piping system diagram of a heat pump type hot water supply apparatus according to the first embodiment of the present invention.

  As shown in FIG. 1, the hot water supply device includes a hot water storage unit 1 and a heat pump unit 2 connected to the hot water storage unit 1. The hot water storage unit 1 includes a hot water storage tank 3, a boiling heat exchanger 10, a reheating heat exchanger 20, a control device 100 (shown in FIG. 2), and the like.

  One end of a pipe L1 is connected to the lower part of the hot water storage tank 3, and the other end of the pipe L1 is connected to a first water inlet port of a boiling mixing valve 50 as an example of a mixing valve. One end of the pipe L <b> 2 is connected to the water outlet port of the boiling mixing valve 50, and the other end of the pipe L <b> 2 is connected to one end of the boiling heat exchanger 10. Further, the other end of the boiling heat exchanger 10 is connected to one end of the pipe L <b> 3, and the other end of the pipe L <b> 3 is connected to the upper part of the hot water storage tank 3. A boiling circulation pump P1 as an example of a boiling pump is disposed in the pipe L2.

  The piping L1, piping L2, boiling heat exchanger 10, and piping L3 constitute a boiling circuit.

  By driving the boiling circulation pump P1 with the opening degree of the first mixing port 50 (hot water storage tank 3 side) of the boiling mixing valve 50 fully opened, the hot water in the hot water storage tank 3 is connected to the pipe L1. , The mixture is circulated through the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3.

  The boiling heat exchanger 10 is connected to the heat pump unit 2 via the refrigerant pipes L4 and L5. The heat pump unit 2 uses an HFC refrigerant, and can control the temperature of the hot water from the boiling heat exchanger 10 in a range of, for example, 50 ° C to 70 ° C. Examples of the HFC refrigerant used in the heat pump unit 2 include R32, R125, R134a, R404A, R410A, and R407C.

  Next, an external water supply pipe is connected to the lower part of the hot water storage tank 3 through a pipe L11. A pressure reducing valve 11 and a check valve 12 are arranged in this pipe L11 in order from the upstream side. This check valve 12 allows only the flow from the water supply pipe side to the hot water storage tank 3 side.

  In addition, one end of the pipe L21 is connected to the upper part of the hot water storage tank 3, and the other end of the pipe L21 is connected to a primary water inlet port of the memory heat exchanger 20. One end of the pipe L22 is connected to the primary water outlet port of the additional heat exchanger 20, and the other end of the pipe L22 is connected to the second water inlet port of the boiling mixing valve 50.

  The piping L21, the reheating heat exchanger 20, and the piping L22 constitute a bath reheating circuit.

  By driving the boiling circulation pump P1 with the opening on the second water inlet port side (bath reheating circuit side) of the boiling mixing valve 50 fully open, the hot water in the hot water storage tank 3 is removed. And circulating through the pipe L21, the reheating heat exchanger 20 (primary side), the pipe L22, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3.

  Further, one end of the pipe L31 is connected to the upper part of the hot water storage tank 3, and the other end of the pipe L31 is connected to the first water inlet port of the hot water supply mixing valve 22. A check valve 21 that allows only a flow from the hot water storage tank 3 side to the hot water supply mixing valve 22 is disposed in the pipe L31. One end of the branch pipe L12 is connected to the second water inlet port of the hot water supply mixing valve 22, and the other end of the branch pipe L12 is connected between the pressure reducing valve 11 and the check valve 12 of the pipe L11. The branch pipe L12 is provided with a check valve 23 that allows only the flow from the pipe L11 side to the hot water supply mixing valve 22.

  One end of the pipe L32 is connected to the water outlet port of the hot water supply mixing valve 22, and the other end of the pipe L32 is connected to the hot water tap 60 (a faucet in this embodiment). A water amount sensor 24 is disposed in the pipe L32.

  The branch pipe L12, the pipe L31, the pipe L32, the check valve 21, the hot water supply mixing valve 22, the check valve 23, and the water amount sensor 24 constitute a hot water supply circuit.

  One end of the pipe L33 is connected to the upstream side of the water amount sensor 24 of the pipe L32, and the other end of the pipe L33 is connected to the hot water supply port 9a of the connection adapter 9 provided in the bathtub 4. A hot water filling solenoid valve 25, a check valve 26, a water amount sensor 27, and a check valve 28 are arranged in this order from the upstream side of the pipe L33. These check valves 26 and 28 allow only the flow from the hot water supply mixing valve 22 side to the bathtub 4.

  The pipe L33, the hot water solenoid valve 25, the check valves 26 and 28, and the water amount sensor 27 constitute a bath hot water supply circuit branched from the hot water supply pipe L32 and connected to the bathtub 4.

  One end of the pipe L35 is connected to the intake water inlet 9b for the replenishment of the connection adapter 9, and the other end of the pipe L35 is connected to the water inlet port on the secondary side of the retreat heat exchanger 20. A circulation pump P2 for bath is disposed in the pipe L35. In addition, one end of the pipe L34 is connected to the downstream side of the water amount sensor 27 of the pipe L33, and the other end of the pipe L34 is connected to the secondary water outlet port of the remedy heat exchanger 20.

  The hot water in the bathtub 4 is circulated through the pipe L35, the memorial heat exchanger 20 (secondary side), the pipe L34, and the pipe L33 (part) by the bath circulation pump P2.

  The above-mentioned pipe L35, additional heat exchanger 20 (secondary side), pipe L34, and pipe L33 (part) constitute a bath circulation circuit.

  Furthermore, one end of the pipe L41 is connected to the pipe L21, and the other end of the pipe L41 is connected to the drain port. A relief valve 31 is provided in the pipe L41.

  The hot water storage tank 3 is provided with four temperature sensors T1 to T4 at substantially equal intervals from the lower side to the upper side. In addition, a temperature sensor T11 for detecting the incoming water temperature is provided in the pipe L2, and a temperature sensor T12 for detecting the hot water temperature is provided in the pipe L3. The temperature sensor T11 is an example of an incoming water temperature sensor, and the temperature sensor T12 is an example of a tapping temperature sensor.

  The boiling heat exchanger 10 is provided with a temperature sensor T13. In addition, a temperature sensor T <b> 21 for detecting a hot water supply temperature is provided in the pipe L <b> 32 connected to the hot water tap 60 on the downstream side of the water amount sensor 24. In addition, a water level sensor LS, a water flow switch SW, and a temperature sensor T23 are connected to the pipe L35 connected to the bathtub 4 from the connection adapter 9 side between the connection adapter 9 on the bathtub 4 side and the circulation pump P2 for bath. In order. Furthermore, a temperature sensor T22 that detects the temperature of hot water supplied to the bathtub 4 is provided downstream of the check valve 28 of the pipe L33 connected to the bathtub 4 and at a connection point between the pipe L33 and the pipe L34. Yes.

  FIG. 2 is a control block diagram of the hot water supply apparatus. As shown in FIG. 2, the hot water supply device includes a control device 100 including a microcomputer and an input / output circuit, and a remote controller 200 that transmits and receives signals to and from the control device 100. The control device 100 includes signals from temperature sensors T1 to T4, T11 to T13, T21 to T23, a water level sensor LS, a water flow switch SW, water volume sensors 24 and 27, an outside air temperature sensor (not shown), a remote controller 200, and the like. In response, the heat pump unit 2, the boiling circulation pump P1, the bath circulation pump P2, the hot water supply mixing valve 22, the hot water filling electromagnetic valve 25, the boiling mixing valve 50, and the like are controlled.

  In addition, the control device 100 includes a boiling control unit 100a that controls an operation of boiling hot water in the hot water storage tank 3, a hot water supply control unit 100b that controls a hot water supply temperature to the hot water tap 60, and a “bath hot water operation”. The bath pouring control unit 100c for controlling the pouring operation to the bathtub 4 including the above, and the bath chasing control unit 100d for controlling the “bath chasing operation”.

<Hot water supply operation>
In the hot water supply apparatus configured as described above, in the “hot water supply operation” for controlling the hot water supply temperature to the hot water tap 60, hot water discharged from the upper part of the hot water storage tank 3 and water supplied from the external water supply pipes via the pipes L 11 and L 12. Is mixed by the hot water mixing valve 22 to supply hot water having a desired temperature at the hot water tap 60. At this time, the mixing ratio of the hot water supply mixing valve 22 is controlled by the hot water supply control unit 100b of the control device 100 so that the hot water supply temperature detected by the temperature sensor T21 becomes the hot water supply set temperature.

<Boiling operation>
In the “boiling operation” in which hot water in the hot water storage tank 3 is boiled by the heat pump unit 2, the boiling control unit 100 a of the control device 100 causes the first mixing port 50 side (hot water storage tank 3 side) of the boiling mixing valve 50. The boiling circulation pump P1 is operated with the opening degree of fully opened, and the hot water in the hot water storage tank 3 is supplied to the pipe L1, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3. Circulate through.

  The boiling controller 100a controls the heat pump unit 2 and the boiling circulation pump P1 so that the tapping temperature detected by the temperature sensor T12 becomes the boiling target tapping temperature TS1 during the boiling operation. Here, the boiling target hot water temperature TS1 is calculated by the control device 100 based on the amount of hot water supplied from the hot water storage tank 3 or the like. For example, when the amount of hot water used is large, the boiling target hot water temperature TS1 is as high as 70 ° C., for example, and when the amount of hot water used is small, the boiling target hot water temperature TS1 is as low as 50 ° C., for example.

<Bath bathing operation>
Next, when performing a “bath hot water operation” for supplying hot water from the hot water storage tank 3 into the bath tub 4, the hot water filling electromagnetic valve 25 is opened by the bath pouring controller 100 c of the control device 100, and the hot water storage tank 3. The hot water inside is supplied into the bathtub 4 via the hot water mixing valve 22 and the bath hot water supply circuit (L33, 25, 26, 27, 28). At this time, the bath pouring control unit 100c controls the hot water supply mixing valve 22 to mix the hot water from the hot water storage tank 3 and the external water supply based on the target set temperature, and at the same time, the water level sensor LS. When the water level in the bathtub 4 detected by the above reaches the set water level, the hot water solenoid valve 25 is closed.

<Bath memorial operation>
Next, when performing a “bath chasing operation” in which the hot water in the bath tub 4 is chased from the hot water storage tank 3, the hot water filling electromagnetic valve 25 is closed by the bath chasing control unit 100 d of the control device 100. In this state, the bath circulation pump P2 is operated to circulate hot water in the bathtub 4 through the pipe L35, the memorial heat exchanger 20 (secondary side), the pipe L34, and the pipe L33 (part).

  Then, based on the bath temperature of the hot water in the bathtub 4 detected by the temperature sensor T23, the bath chasing control unit 100d does not use the heat pump unit 2 and bath chasing operation using the hot water in the hot water storage tank 3 as a heat source. When the amount of heat in the hot water storage tank 3 is not sufficient, the bath pumping operation is performed using the heat pump unit 2.

  In the bath chasing operation, hot water from the boiling heat exchanger 10 is heated by the boiling circulation pump P1, the hot water storage tank 3, the boiling circuit (L1, L2, 10, L3), and the bath chasing circuit (L21, 20, Recirculate through L22) to retreat the bath.

  Hereinafter, the bath chasing operation using the heat pump unit 2 by the bath chasing control unit 100d of the control device 100 will be described according to the flowcharts shown in FIGS.

  First, when the bath chase operation process is started, it is determined in step S1 shown in FIG. 3 whether or not there is a chase request. If it is judged that there is a chase request, the process proceeds to step S2. This memorial operation is requested by the user pressing a button on the remote controller 200, or is requested almost regularly during bath warming.

  Next, in step S2, the bath circulation pump P2 is turned on.

  Next, it progresses to step S3, and the opening degree of the bath reheating circuit side (2nd water inlet port side) of the boiling mixing valve 50 is fully opened.

  Next, the process proceeds to step S4, the heat pump unit 2 is turned on, the process proceeds to step S5, and the boiling circulation pump P1 is turned on.

  Next, it progresses to step S6 and detects tapping temperature with temperature sensor T12.

  Next, it progresses to step S7 and the rotation speed of the circulating pump P1 for boiling is controlled so that the tapping temperature becomes the memorial target tapping temperature TS2 (55 ° C. in this embodiment).

Here, when the boiling target hot water temperature during boiling operation for boiling hot water in the hot water storage tank 3 is TS1, the memorial target hot water temperature TS2 is:
Remembrance target hot water temperature TS2 = boiling target hot water temperature TS1-10 ° C
It is said.

  Next, it progresses to step S8 and the bath temperature (temperature of the hot water in the bathtub 4) is detected by the temperature sensor T23.

  If it is determined in step S9 that the bath temperature is lower than the completion temperature t_stop, the process returns to step S6. On the other hand, if it is determined that the bath temperature is equal to or higher than the completion temperature t_stop, the process proceeds to step S10.

  In step S10, the bath circulation pump P2 is turned off, and the process proceeds to step S11 shown in FIG.

  Next, the tapping temperature is detected by the temperature sensor T12 in step S11 shown in FIG.

  Next, it progresses to step S12 and the rotation speed of the circulation pump P1 for boiling is controlled so that the tapping temperature becomes the boiling target tapping temperature TS1 (65 ° C. in this embodiment).

  Next, in step S13, the tapping temperature is detected by the temperature sensor T12.

  If it is determined in step S14 that the tapping temperature is lower than the boiling target tapping temperature TS1, the process returns to step S12. If it is determined that the tapping temperature is equal to or higher than the boiling target tapping temperature TS1, the process proceeds to step S15.

  Then, in step S15, the heat pump unit 2 is turned off, the process proceeds to step S16, the boiling circulation pump P1 is turned off, and the bath chasing operation process is terminated.

  During the bath chasing operation, the temperature sensor T4 causes the hot water temperature in the upper part of the hot water storage tank 3 to fall below a predetermined temperature, and the temperature of the hot water supplied to the memorial heat exchanger 20 drops so that it cannot be retreated. If this happens, end the bath memorial operation.

  Further, the memorial target hot water temperature TS2 is not limited to (boiling target hot water temperature TS1-10 ° C.), but based on the bath temperature or the incoming water temperature of the boiling heat exchanger 10, for example, (bath temperature + 10 ° C.) or It may be determined to be (the incoming water temperature of the boiling heat exchanger 10 + 10 ° C.), or may be determined based on both the bath temperature and the incoming water temperature of the boiling heat exchanger 10. When this memorial target hot water temperature TS2 is set to (bath temperature + 10 ° C), even if the bath temperature changes, the hot water that is + 10 ° C higher than the bath temperature is always returned to the upper part of the hot water tank 3, so The hot water in the bathtub 4 can be chased by the hot water at the top of.

  Moreover, it can prevent that the hot water of the upper part in the hot water storage tank 3 cools by making the minimum of the tracking target hot water temperature TS2 at this time into 45 degreeC. Alternatively, by setting the lower limit value of the rotation speed of the circulating pump P1 for boiling to, for example, 2000 rpm, it is possible to prevent the circulation flow rate from becoming too small.

  FIG. 5 shows changes in the hot water temperature, the incoming water temperature, and the bath temperature during the bath chase operation using the heat pump unit 2 in the hot water supply apparatus. In FIG. 5, the curve indicated by the solid line indicates the temperature change of the first embodiment, and the curve indicated by the dotted line indicates the temperature change of the first comparative example. This 1st comparative example has shown the case where the hot water temperature at the time of bath chase operation does not fall as boiling target hot water temperature TS1.

  As shown in FIG. 5, when the bath chasing operation is started and the heat pump unit 2, the boiling circulation pump P1 and the bath circulation pump P2 are turned on, the hot water from the boiling heat exchanger 10 is heated up. And the bath temperature rises by circulating through the bath chasing circuit. As the bath temperature rises, the incoming water temperature of the boiling heat exchanger 10 also rises. Here, the tapping temperature of the boiling heat exchanger 10 reaches the tracking target tapping temperature TS2 lower than the boiling target tapping temperature TS1 and is stabilized by controlling the rotation speed of the boiling circulation pump P1.

  In the first comparative example, the rotational speed of the boiling circulation pump P1 is feedback-controlled so that the tapping temperature becomes the boiling target tapping temperature TS1.

  In the hot water supply apparatus, as shown in the area A1 in FIG. 5, the temperature of the hot water in the boiling heat exchanger 10 is lower than that in the first comparative example, but the circulating flow rate to the additional heat exchanger 20 is increased. As a result, the temperature of the bath increases quickly as shown in the region B1.

  In addition, after the bath temperature is equal to or higher than the completion temperature t_stop, and the completion operation is completed, the boiling control unit 100a of the control device 100 performs the boiling operation to perform the boiling operation on the first water inlet port side. With the opening of the (hot water storage tank 3 side) fully opened, the heat pump unit 2 and the boiling circulation pump P1 are set so that the hot water temperature becomes the boiling target hot water temperature TS1 as shown in a region C1 in FIG. By controlling, the hot water in the hot water storage tank 3 is circulated through the pipe L1, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3 to boil the hot water in the lower part of the hot water storage tank 3. increase.

  In the first embodiment, when the bath chasing operation is performed with the opening on the second water inlet port side (the bath chasing circuit side) of the boiling mixing valve 50 fully opened, for example, the boiling target hot water temperature When TS1 is 65 ° C. and the reheating target hot water temperature TS2 is 55 ° C., the incoming water temperature and the outgoing hot water temperature of the boiling heat exchanger 10, the circulation flow rate to the reheating heat exchanger 20 and the boiling circulation pump P1 An example of the relationship between the rotational speeds is shown in Table 1.

  Thus, the circulation flow rate to the memory heat exchanger 20 can be increased by lowering the tapping temperature of the boiling heat exchanger 10.

  In this embodiment, the hot water in the hot water storage tank 3 is circulated through the pipe L1, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3. When the heating target tapping temperature TS1 is 65 ° C., the rotation speed of the boiling circulation pump P1 is 1000 rpm.

  According to the hot water supply apparatus having the above-described configuration, the boiling circulation pump P1 and the heat pump unit 2 are controlled by the control device 100 during the bath chasing operation, and the hot water storage tank 3, the chasing heat exchanger 20, and the boiling heat exchanger are controlled. When performing a bath chasing operation in which hot water is circulated by the boiling circulation pump P1 through the bath 10 to recharge the bath, the hot water discharged from the boiling heat exchanger 10 is detected by the temperature sensor T12 (hot water temperature sensor). The temperature is set lower than the tapping temperature of the boiling heat exchanger 10 during the boiling operation for boiling hot water in the hot water storage tank 3 (in this embodiment, the boiling target tapping temperature TS1). Thereby, since the amount of hot water supplied to the memory heat exchanger 20 is increased by increasing the amount of hot water of the boiling heat exchanger 10 at the time of bath chase operation, the temperature of the hot water of the boiling heat exchanger 10 is increased. Even if it is lowered to some extent, the heat exchange efficiency in the memory heat exchanger 20 is improved. At this time, since hot hot water is accumulated in the upper part of the hot water storage tank 3, even if the hot water temperature of the boiling heat exchanger 10 is controlled and lowered, it is possible to prevent a decrease in bath reheating ability.

  Further, during the bath chase operation, the controller 100 rotates the boiling circulation pump P1 so that the tapping temperature detected by the temperature sensor T12 is lower than the boiling target tapping temperature TS1 during the boiling operation. Since the number is controlled, it becomes possible to accurately control the tapping temperature of the boiling heat exchanger 10 suitable for the heat exchange in the memory heat exchanger 20.

  In the first embodiment, the bath chasing operation is performed with the opening on the second water inlet port side (the bath chasing circuit side) of the boiling mixing valve 50 being fully opened. In the valve 50, the hot water from the reheating heat exchanger 20 and hot water from the lower part of the hot water storage tank 3 may be mixed to perform the bath renewal operation.

  In the bath chase operation for controlling the opening degree of the boiling mixing valve 50, the bath chase control unit 100d has a water temperature of the boiling heat exchanger 10 detected by the temperature sensor T11 within a predetermined temperature range. Thus, the opening degree of the boiling-up mixing valve 50 is feedback-controlled at intervals of 3 seconds. At this time, the opening of the first mixing port 50 (the hot water tank 3 side) of the boiling mixing valve 50 is opened from the state where the opening of the second mixing port 50 (the bath reheating circuit side) of the boiling mixing valve 50 is fully opened. The temperature is gradually opened to increase the mixing ratio of hot water from the lower part of the hot water storage tank 3, thereby suppressing an increase in the incoming water temperature of the boiling heat exchanger 10.

  In this case, when the incoming water temperature of the boiling heat exchanger 10 becomes equal to or higher than the mixing start temperature t_mix during the bath chase operation, the opening degree of the boil-up mixing valve 50 is controlled, and the boiling mixing valve 50 performs the chase. The hot water from the heat exchanger 20 and hot water from the lower part of the hot water storage tank 3 are mixed to perform a bath chasing operation. For example, when the boiling target hot water temperature TS1 is 65 ° C., the target hot water temperature TS2 is 55 ° C., and the incoming water temperature is 10 ° C., the incoming water temperature, the outgoing water temperature and the additional heat exchange of the boiling heat exchanger 10 An example of the relationship of the circulation flow rate to the vessel 20 is shown in Table 2.

  Even if the bath temperature rises by mixing the return hot water from the memory heat exchanger 20 and the hot water from the lower part of the hot water storage tank 3 with the boiling mixing valve 50, the incoming water temperature of the boiling heat exchanger 10 is increased. Is stable without increasing, and the heating efficiency of the heat pump unit 2 can be prevented from decreasing. At this time, the mixing ratio of hot water from the lower part of the hot water storage tank 3 is increased in the boiling mixing valve 50, and the circulating flow rate of hot water flowing through the additional heat exchanger 20 gradually decreases, but the boiling target hot water temperature TS1. By lowering the tapping temperature from (65 ° C.) to the memorial target tapping temperature TS2 (55 ° C.), the rotation speed of the circulating pump P1 for boiling rises, and the circulation flow rate to the memorial heat exchanger 20 can be increased. it can.

  Then, when the bath temperature reaches the completion temperature t_stop, the bath circulation pump P2 is turned off and the first inlet port side (hot water storage tank 3 side) of the boiling mixing valve 50 is opened by boiling operation. With the temperature fully open, the heat pump unit 2 and the boiling circulation pump P1 are controlled so that the hot water temperature becomes the boiling target hot water temperature TS1, and the hot water in the upper part of the hot water storage tank 3 is boiled.

  In this way, during the bath chasing operation, hot water returning from the upper part of the hot water storage tank 3 through the memorial heat exchanger 20 and hot water from the lower part of the hot water tank 3 are mixed by the boiling mixing valve 50, By supplying mixed water from the upper mixing valve 50 to the boiling heat exchanger 10, the water heated by the boiling heat exchanger 10 is lowered while lowering the incoming water temperature to the boiling heat exchanger 10 of the heat pump unit 2. Since hot water is supplied to the bath reheating circuit via the upper part of the hot water storage tank 3, the heating efficiency of the heat pump unit 2 can be improved.

  Further, based on the incoming water temperature of the boiling heat exchanger 10 detected by the temperature sensor T12 (incoming water temperature sensor), the opening degree of the boiling mixing valve 50 is controlled, and the boiling mixing valve 50 controls the bath. By mixing hot water from the lower part of the hot water storage tank 3 with the return water of the reheating circuit, the boiling heat exchanger is improved so as to improve the heating efficiency of the heat pump unit 2 while preventing a decrease in the reheating capacity of the bath. The incoming water temperature of 10 can be lowered to the optimum temperature. Note that the opening degree of the boiling mixing valve 50 is not limited to the incoming water temperature of the boiling heat exchanger 10, but the incoming water temperature of the boiling heat exchanger 10, the temperature of the return water of the bath reheating circuit, and the bath tub. The temperature may be controlled based on at least one of the hot water bath temperatures.

[Second Embodiment]
FIG. 6 is a flowchart for explaining the operation of the bath chasing operation using the heat pump unit by the bath chasing control unit 100d of the control device 100 of the heat pump type hot water supply apparatus of the second embodiment of the present invention. The hot water supply device of the second embodiment has the same configuration as the hot water supply device of the first embodiment except for the operation of the control device 100, and FIGS.

  The operation of the bath chase operation of the hot water supply apparatus of the second embodiment will be described below according to the flowchart shown in FIG.

  First, when the bath chase operation process is started, it is determined in step S21 shown in FIG. 6 whether or not there is a chase request. If it is judged that there is a chase request, the process proceeds to step S22. This memorial operation is requested by the user pressing a button on the remote controller 200, or is requested almost regularly during bath warming.

  In step S22, the bath circulation pump P2 is turned on.

  Next, it progresses to step S23 and the opening degree of the bath reheating circuit side (2nd water inlet port side) of the mixing valve 50 for boiling is fully opened.

  Next, the process proceeds to step S24, the heat pump unit 2 is turned on, and the process proceeds to step S25, where the boiling circulation pump P1 is turned on and driven at a predetermined rotational speed R_bath.

  Next, it progresses to step S26 and detects bath temperature (temperature of the hot water in the bathtub 4) by temperature sensor T23.

  If it is determined in step S27 that the bath temperature is lower than the completion temperature t_stop, the process returns to step S26, while if it is determined that the bath temperature is equal to or higher than the completion temperature t_stop, the process proceeds to step S28.

  Next, in step S28, the bath circulation pump P2 is turned off.

  Next, the process proceeds to step S29, the heat pump unit 2 is turned off, the process proceeds to step S30, the boiling circulation pump P1 is turned off, and the bath chasing operation process is terminated.

  Here, the rotation speed R_bath of the boiling circulation pump P1 is determined in advance in a table (shown in Table 3) in accordance with, for example, the temperature of water entering the boiling heat exchanger 10.

  FIG. 7 shows changes in the hot water temperature, the incoming water temperature, the bath temperature, and the rotational speed of the boiling circulation pump P1 during the bath chase operation of the hot water supply apparatus. In FIG. 7, the curve indicated by the solid line indicates the temperature change of the second embodiment, and the curve indicated by the dotted line indicates the temperature change of the second comparative example. This second comparative example shows a case where feedback control is performed so that the tapping temperature becomes the boiling target tapping temperature TS1 without fixing the number of rotations of the boiling circulation pump P1 during the bath chase operation. .

  In the hot water supply apparatus, as shown in the area A2 of FIG. 7, the hot water temperature of the boiling heat exchanger 10 is lower than that in the second comparative example, but the circulation flow rate to the additional heat exchanger 20 is increased. As a result, the temperature of the bath increases rapidly as shown in the region B2.

  In addition, after the bath temperature is equal to or higher than the completion temperature t_stop, and the completion operation is completed, the boiling control unit 100a of the control device 100 performs the boiling operation to perform the boiling operation on the first water inlet port side. With the opening of the (hot water storage tank 3 side) fully opened, the heat pump unit 2 and the boiling circulation pump P1 are controlled so that the hot water temperature becomes the target hot water temperature TS as shown in the region C2 of FIG. Then, hot water in the hot water storage tank 3 is circulated through the pipe L1, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3, and the hot water in the lower part of the hot water storage tank 3 is boiled. At this time, as shown in a region D2 of FIG. 7, the rotational speed of the boiling circulation pump P1 is feedback controlled so that the tapping temperature becomes the boiling target tapping temperature TS1.

  The controller 100 drives the boiling circulation pump P1 at a preset rotation speed R_bath, thereby raising the boiling water temperature of the boiling heat exchanger 10 detected by the temperature sensor T12 during the bath chase operation. It becomes possible by simple control to make it lower than the tapping temperature of the boiling heat exchanger 10 during operation.

  The hot water supply device of the second embodiment has the same effect as the hot water supply device of the first embodiment.

  Also in the second embodiment, similar to the hot water supply apparatus of the first embodiment, the boiling hot water mixing valve 50 mixes the return hot water from the additional heat exchanger 20 and the hot water from the lower part of the hot water storage tank 3. A bath memorial operation may be performed.

  In the said 1st, 2nd embodiment, although the hot water supply apparatus provided with the mixing valve 50 for boiling was demonstrated, not only a mixing valve but the flow-path switching valve which switches a flow path may be sufficient. The flow path switching valve may have a configuration in which one of the electromagnetic valves provided in each of the two water inlet side pipes to be switched is opened and the other is closed.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first and second embodiments described above, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Hot water storage unit 2 ... Heat pump unit 3 ... Hot water storage tank 4 ... Bathtub 9 ... Connection adapter 9a ... Hot water inlet 9b ... Water intake for remedy 10 ... Boiling heat exchanger 11 ... Pressure reducing valve 12, 21, 23, 26, 28 ... Check valve 20 ... Remembrance heat exchanger 22 ... Mixing valve for hot water supply 24, 27 ... Water volume sensor 25 ... Solenoid valve for hot water filling 31 ... Relief valve 50 ... Mixing valve for boiling 60 ... Hot water tap 100 ... Control device 100a ... Boiling control unit 100b ... Hot water supply control unit 100c ... Bath pouring control unit 100d ... Bath bath control unit 200 ... Remote controller L1, L2, L3, L11, L21, L22, L31-L35, L41 ... Piping L4, L5 ... Refrigerant piping L12 ... Branch piping LS ... Water level sensor P1 ... Circulating pump for boiling P2 ... Circulating pump for bath SW ... Water flow switch T1-T4, T11-T13, T21-T23 ... Temperature sensor

Claims (5)

A hot water storage tank (3),
A boiling circuit (L1, L2, 10, L3) connected from the lower part of the hot water storage tank (3) to the upper part of the hot water storage tank (3) via a boiling heat exchanger (10);
A bath reheating circuit (L21, 20, L22) connected from the upper part of the hot water storage tank (3) to the incoming side of the boiling heat exchanger (10) via the reheating heat exchanger (20);
A boiling pump (P1) disposed in the boiling circuit (L1, L2, 10, L3);
A heat pump unit (2) for boiling hot water in the hot water storage tank (3) by the boiling heat exchanger (10);
A tapping temperature sensor (T12) for detecting a tapping temperature of the boiling heat exchanger (10);
A controller (100) for controlling the boiling pump (P1) and the heat pump unit (2);
The control device (100) controls the boiling pump (P1) and the heat pump unit (2), and controls the upper part in the hot water storage tank (3) , the reheating heat exchanger (20), and the boiling water. When performing bath bathing operation in which hot water is circulated by the boiling pump (P1) through the heat exchanger (10) to recharge the bath, the boiling temperature detected by the hot water temperature sensor (T12) is detected. The hot water temperature of the heat exchanger (10) is set lower than the target hot water temperature of the boiling heat exchanger (10) during the boiling operation for boiling the hot water in the hot water storage tank (3) , and The hot water supply apparatus characterized by increasing the circulation flow rate to the additional heat exchanger (20) as compared with the above boiling operation . The hot water supply apparatus according to claim 1,
The control device (100), upon the bath Tsui焚operation, as hot water temperature detected by the hot water temperature sensor (T12) is lower than the heating-up target hot water temperature at the time on the boiling operation, the A hot water supply apparatus that controls the number of rotations of the boiling pump (P1). The hot water supply apparatus according to claim 1,
The controller (100) drives the boiling pump (P1) at a preset number of rotations, whereby the boiling heat exchange detected by the tapping temperature sensor (T12) during the bath chase operation. The hot water supply apparatus characterized by making the hot water temperature of a boiler (10) lower than the said boiling target hot water temperature of the said boiling heat exchanger (10) at the time of the said boiling operation. In the hot water supply device according to any one of claims 1 to 3,
During the bath chasing operation, hot water returning from the upper part of the hot water storage tank (3) through the memorial heat exchanger (20) and hot water from the lower part of the hot water storage tank (3) are mixed to raise the boiling temperature. A hot water supply apparatus comprising a mixing valve (50) for entering water into the heat exchanger (10). The hot water supply apparatus according to claim 4,
The control device (100), during the bath chase operation, has an incoming water temperature of the boiling heat exchanger (10), a return hot water temperature of the bath chase circuit (L21, 20, L22), and a bath tub. A hot water supply apparatus for controlling the mixing valve (50) based on at least one of the bath temperatures of the hot water inside.

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