JP2016001074A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of suppressing deterioration of a power saving property of the next day and thereafter, even when a bathtub plug is opened during hot water filling time.SOLUTION: A hot water storage type water heater includes: heating means for heating water; a hot water storage tank for storing the hot water heated by the heating means; and control means having a function of determining an open/closed state of a bathtub plug at hot water filling time of the bathtub, a function of learning a used hot water amount in the past and a function of controlling a heat storage amount of the hot water storage tank based on the learning value of the used hot water amount. The control means, in the case where it determines that the bathtub plug is opened at the hot water filling time, invalidates the hot water filling in the learning of the used hot water amount.

Description

  The present invention relates to a hot water storage type water heater.

  Hot water storage water heaters that store hot water heated by heating means such as heat pumps in hot water storage tanks and use hot water taken out of hot water storage tanks to hot water sources such as bathtubs, showers, kitchens, and faucets in bathrooms are widely used. It has been.

  In Patent Document 1, the height h from the bottom surface of the bathtub to the circulation fitting is stored in advance, hot water is supplied to the bathtub so as to reach a predetermined water level, the bottom area S of the bathtub is calculated from the amount of the hot water, and the bottom area S From the height h, the hot water amount Q when hot water is supplied to the bathtub slightly above the circulating metal fitting is calculated and stored, and thereafter the hot water of the hot water amount Q is supplied to the bathtub via the circulating metal fitting. Thus, there is disclosed a technique for determining that a bathtub tap has been forgotten to be closed unless hot water circulates in the circulation path.

JP-A-5-87409

  There is a hot water storage type water heater that controls the amount of heat stored in a hot water storage tank based on a learning value of the amount of hot water used. If hot water is applied after hot water is applied in a state where the bathtub tap is opened, the amount of hot water used is increased more than usual. If such an excessive amount of hot water used is learned, the amount of heat stored in the hot water storage tank on and after the next day is controlled more than necessary, and there is a concern that the energy saving performance is reduced.

  The present invention was made in order to solve the above-described problems, and provides a hot water storage type water heater capable of suppressing a decrease in energy saving after the next day even when a bathtub tap is open during hot water filling. Objective.

  The hot water storage type hot water supply apparatus according to the present invention includes a heating means for heating water, a hot water storage tank for storing hot water heated by the heating means, a function for determining the open / close state of the bathtub plug when the bathtub is hot, And a control means having a function of learning the amount of hot water used and a function of controlling the amount of heat stored in the hot water storage tank based on the learning value of the amount of hot water used, and the control means determines that the bathtub tap is open during hot water filling. In such a case, the hot water beam is invalidated in learning of the amount of hot water used.

  According to the hot water storage type water heater of the present invention, it is possible to suppress a decrease in energy saving after the next day even when the bathtub tap is open during hot water filling.

It is a block diagram which shows the hot water storage type water heater of Embodiment 1 of this invention. It is a graph which shows typically the temporal change of the amount of hot water used and the heat storage operation start hot water amount when there is no forgetting to close the bathtub tap during hot water filling (that is, the bathtub tap is closed). A graph schematically showing temporal changes in the amount of hot water used and the amount of hot water at the start of heat storage operation when the bathtub tap is forgotten to close during hot water filling (that is, the bathtub tap is opened) and immediately after that, It is. It is a flowchart which shows the control operation | movement which a control part performs when performing hot water beam in the hot water storage type water heater of Embodiment 1 of this invention. It is a flowchart which shows the control action which a control part performs when performing hot water beam in the hot water storage type water heater of Embodiment 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water storage type water heater according to Embodiment 1 of the present invention. As shown in FIG. 1, a hot water storage type water heater 35 according to the first embodiment includes a tank unit 33 that incorporates a hot water storage tank 8, an HP unit 7 that uses a heat pump cycle, and a user's operation command and set value. And a remote control device 44 that accepts operations such as change of The HP unit 7 and the tank unit 33 are connected via an HP outgoing pipe 14, an HP return pipe 15, and electrical wiring (not shown). The tank unit 33 includes a control unit 36 (control means). Operations of various valves, pumps and the like provided in the tank unit 33 and the HP unit 7 are controlled by a control unit 36 electrically connected thereto. The control unit 36 and the remote control device 44 are connected to be able to communicate with each other. Although not shown in the drawings, the remote control device 44 includes a display unit that displays information such as the state of the hot water storage water heater 35, an operation unit such as a switch operated by a user, a speaker, a microphone, and the like.

  The HP unit 7 has a function of a heating unit that heats the water guided from the tank unit 33. The HP unit 7 includes a refrigerant circuit in which the compressor 1, the water refrigerant heat exchanger 3, the expansion valve 4, and the air heat exchanger 6 are connected in a ring shape with a refrigerant pipe 5, and operates a heat pump cycle. The water refrigerant heat exchanger 3 heats water by exchanging heat between the high-temperature and high-pressure refrigerant compressed by the compressor 1 and water.

  The tank unit 33 incorporates the following various components and piping. The hot water storage tank 8 stores hot water. A third water supply pipe 9 c is connected to a water inlet 8 a provided at the lower part of the hot water storage tank 8. Water (low temperature water) supplied from a water source such as water supply is adjusted to a predetermined pressure by the pressure reducing valve 31 and then flows into the hot water storage tank 8 through the third water supply pipe 9c. A hot water supply pipe 21 and a hot water supply pipe 13 are connected to a hot water introduction outlet 8 d provided in the upper part of the hot water storage tank 8. The hot water heated by the HP unit 7 passes through the hot water supply pipe 13 and flows into the hot water storage tank 8 from the hot water introduction outlet 8d. Hot water is stored in the hot water storage tank 8 by forming a temperature stratification in which the upper side is hot and the lower side is low. On the surface of the hot water storage tank 8, a plurality of hot water storage temperature sensors 42 and 43 are attached at different height positions. These hot water storage temperature sensors 42 and 43 can detect the temperature distribution of hot water in the hot water storage tank 8. The control unit 36 can grasp the remaining hot water amount and the heat storage amount in the hot water storage tank 8 based on the temperature distribution. In the illustrated configuration, the number of hot water storage temperature sensors is two, but three or more hot water storage temperature sensors may be provided.

  The tank unit 33 contains the water pump 12 and the use side heat exchanger 20. The water pump 12 is provided on the HP outgoing pipe 14. The use side heat exchanger 20 uses the heat of hot water supplied from the hot water storage tank 8 or the HP unit 7 to heat the water to be heated on the secondary side (for example, bath water, heating water, etc.). It is. In the first embodiment, as a secondary side configuration of the use-side heat exchanger 20, an explanation will be given of a bath piping 27 and a bath return piping 28 that circulate bath water stored in the bath 30. The use-side heat exchanger 20 is connected to the bathtub 30 via a bath pipe 27 and a bath return pipe 28. A bath circulation circuit is formed by the use side heat exchanger 20, the bath piping 27, the bath return piping 28, and the bathtub 30. The bath circulation circuit includes a bath circulation pump 29 that circulates the bath water, a bath return temperature sensor 38 that detects the temperature of the bath water discharged from the bath 30, and the temperature of the bath water that is output from the use-side heat exchanger 20. A bath temperature sensor 37 to detect and water flow detection means 45 to detect the presence or absence of circulation (water flow) of bathtub water are installed. Although not shown, the bathtub 30 is provided with a bathtub plug (drain plug) for draining the bathtub water.

  The tank unit 33 incorporates the three-way valve 11 and the four-way valve 18. The three-way valve 11 is a flow path switching means having an a port and a b port through which hot water flows and a c port through which hot water flows out. The four-way valve 18 is a flow path switching means having a b port and a c port through which hot water flows, and an a port and a d port through which hot water flows out. The four-way valve 18 is configured to be able to switch the flow path among four paths, that is, ab, ac, bd, and cd. The tank unit 33 further incorporates a water outlet port pipe 10, a first bypass pipe 16, a second bypass pipe 17, a hot water inlet pipe 20a, and a hot water outlet pipe 20b. The water outlet port pipe 10 connects a water outlet 8 b provided at the lower part of the hot water storage tank 8 and the a port of the three-way valve 11. The HP outgoing pipe 14 connects the c port of the three-way valve 11 and the water inlet of the HP unit 7. The HP return pipe 15 connects the water outlet of the HP unit 7 and the c port of the four-way valve 18. The hot water supply pipe 13 connects the d port of the four-way valve 18 and the hot water introduction outlet 8 d above the hot water storage tank 8. The first bypass pipe 16 connects the a port of the four-way valve 18 and the hot water inlet 8 c of the hot water storage tank 8. The hot water inlet 8c is provided at any position between the lower part of the hot water storage tank 8 and the intermediate height position. The hot water introduction pipe 20 a branches off from the middle of the hot water supply pipe 13 and is connected to the primary side inlet of the use side heat exchanger 20. The hot water outlet pipe 20 b connects the primary side outlet of the use side heat exchanger 20 and the b port of the three-way valve 11. The second bypass pipe 17 branches from between the water pump 12 in the HP outgoing pipe 14 and the water inlet of the HP unit 7 and is connected to the b port of the four-way valve 18.

  The tank unit 33 further includes a first water supply pipe 9a, a second water supply pipe 9b, a hot water supply mixing valve 22, a bath mixing valve 23, a first hot water supply pipe 24, and a second hot water supply pipe 25. One end of the first water supply pipe 9a is connected to a water source such as tap water. The other end of the first water supply pipe 9a is connected to the second water supply pipe 9b and the third water supply pipe 9c via the pressure reducing valve 31. A water supply pipe 9 is constituted by the first water supply pipe 9a, the second water supply pipe 9b, and the third water supply pipe 9c. The downstream side of the second water supply pipe 9b is branched into two and connected to the hot water supply mixing valve 22 and the bath mixing valve 23, respectively. The downstream side of the hot water supply pipe 21 is branched into two and connected to a hot water supply mixing valve 22 and a bath mixing valve 23, respectively. The first hot water supply pipe 24 connects the hot water supply mixing valve 22 and the hot water tap 34. A hot water supply flow sensor 46 that detects the flow rate of hot water passing through the first hot water supply pipe 24 is provided in the middle of the first hot water supply pipe 24. The second hot water supply pipe 25 connects the basin mixing valve 23 and the basin circulation circuit (the basin pipe 27). In the middle of the second hot water supply pipe 25, there are provided an electromagnetic valve 26 for opening and closing the second hot water supply pipe 25 and a flow sensor 47 for detecting the flow rate of hot water passing through the second hot water supply pipe 25.

  The mixing valve 22 for hot water supply is set by the user using the remote control device 44 by adjusting the flow rate ratio between the high temperature hot water supplied from the hot water supply pipe 21 and the low temperature water supplied from the second water supply pipe 9b. Hot water having a temperature is generated and flows into the first hot water supply pipe 24. The mixing valve 23 for the bath is set by the user using the remote control device 44 by adjusting the flow rate ratio between the hot water supplied from the hot water supply pipe 21 and the low temperature water supplied from the second water supply pipe 9b. Hot water having a temperature is generated and flows into the second hot water supply pipe 25. The hot water whose temperature has been adjusted by the hot water mixing valve 22 is supplied from the first hot water supply pipe 24 to a faucet (not shown) such as a shower or a currant used by the user via the hot water flow sensor 46 and the hot water tap 34. The When the bathtub 30 is filled with hot water, the bath solenoid valve 26 is opened, and hot water whose temperature is adjusted by the bath mixing valve 23 flows from the second hot water supply piping 25 to the bath solenoid valve 26, the bath flow sensor 47, and the bath piping. 27, supplied to the bathtub 30 via the return pipe 28.

  The three-way valve 11 can be switched between two flow path forms, a form in which the water outlet pipe 10 and the HP outgoing pipe 14 communicate with each other and a form in which the hot water outlet pipe 20b and the HP outgoing pipe 14 communicate with each other. The four-way valve 18 is configured such that the HP return pipe 15 and the hot water supply pipe 13 communicate with each other, the HP return pipe 15 and the first bypass pipe 16 communicate with each other, and the first bypass pipe 16 and the second bypass pipe 17 communicate with each other. It is possible to switch to four flow path forms, that is, a form in which the hot water supply pipe 13 and the second bypass pipe 17 communicate with each other.

  Next, a heat storage operation performed by the hot water storage type water heater 35 of the first embodiment will be described. In the heat storage operation, the control unit 36 operates the HP unit 7 and the water pump 12. The three-way valve 11 is configured to communicate with the water outlet port pipe 10 and the HP outgoing pipe 14 (ac route). The four-way valve 18 is configured such that the HP return pipe 15 and the hot water supply pipe 13 communicate with each other (cd path). By operating the water pump 12, the water in the lower part of the hot water storage tank 8 passes through the water outlet 8 b, the water outlet port 10, the three-way valve 11, and the HP forward pipe 14, and the water refrigerant heat exchange of the HP unit 7 is performed. Sent to vessel 3. Hot water heated to a high temperature while passing through the water-refrigerant heat exchanger 3 flows into the upper part of the hot water storage tank 8 through the HP return pipe 15, the four-way valve 18, the hot water supply pipe 13, and the hot water introduction outlet 8 d. To do. With such a heat storage operation, hot water is stored in the hot water storage tank 8 from the top to the bottom, so that heat is stored in the hot water storage tank 8.

  Next, the hot water beam which the hot water storage type water heater 35 of this Embodiment 1 performs is demonstrated. Hot water is started when the user operates the remote control device 44. At the start of hot water, the control unit 36 performs a priming operation of supplying a predetermined amount (for example, 10 L) of hot water from the second hot water supply pipe 25 to the bathtub 30 through the back-up pipe 27 and the back return pipe 28. Do. This priming operation is performed in order to discharge the air in the bath circulation circuit to the bathtub 30 and prevent the bath circulation pump 29 from being caught by air. After the priming operation, the bath circulation pump 29 is operated to circulate the bath water in the bath circulation circuit. If the bathtub water remains in the bathtub 30 before the hot water starts, the bath water circulates in the bath circulation circuit at this time, so the water flow detecting means 45 detects the water flow. When the water flow detecting means 45 detects the presence of water flow, the control unit 36 determines that bathtub water remains in the bathtub 30, stops the bath circulation pump 29, and stops hot water. On the other hand, when the water flow detection means 45 detects the absence of water flow, the control unit 36 determines that there is no bathtub water remaining in the bathtub 30, stops the bath circulation pump 29, and sets the remaining set hot water amount to the bathtub. 30. After supplying the set amount of hot water to the bathtub 30, the control unit 36 operates the bath circulation pump 29 again. At this time, if the water flow detecting means 45 detects the presence of water flow, it can be estimated that the hot water (tub water) accumulated in the bathtub 30 with the hot water is circulating in the bath circulation circuit. It can be assumed that there is no (that is, the bathtub tap is closed). On the other hand, when the water flow detecting means 45 detects that there is no water flow, it can be estimated that the hot water supplied by the hot water is not accumulated in the bathtub 30, so there is a case where the bathtub tap is forgotten to be closed (that is, the bathtub tap is opened) It can be estimated. As described above, the control unit 36 has a function of determining the open / close state of the bathtub tap during hot water filling. When it is determined that the bathtub tap is open when the hot water is poured, the control unit 36 displays on the display unit of the remote control device 44 that the bathtub tap is not closed or emits a sound from the speaker of the remote control device 44. It is desirable to notify the user by means.

  FIG. 2 is a graph schematically showing temporal changes in the amount of hot water used and the amount of hot water for heat storage operation when there is no forgetting to close the bathtub tap during hot water filling (that is, the bathtub tap is closed). The amount of hot water for starting the heat storage operation is the amount of remaining hot water in the hot water storage tank 8 serving as a threshold for the control unit 36 to start the heat storage operation. The control unit 36 starts the heat storage operation when the remaining hot water amount in the hot water storage tank 8 detected by the hot water storage temperature sensors 42 and 43 becomes equal to or less than the heat storage operation start hot water amount.

  The control unit 36 can calculate the amount of hot water used based on the flow rates detected by the hot water supply flow sensor 46 and the bath flow sensor 47. The control unit 36 may calculate the amount of hot water used by detecting a decrease in the amount of remaining hot water in the hot water storage tank 8 using the hot water storage temperature sensors 42 and 43. The control unit 36 has a function of learning the amount of hot water used such as hot water (hereinafter referred to as “concentrated hot water amount”) during a past fixed period (for example, the past two weeks). The control unit 36 sets the first starting hot water amount as the heat storage operation starting hot water amount until the use of the concentrated hot water amount on that day is finished. The first amount of hot water for starting is the amount of hot water for starting heat storage operation provided for the maximum amount of concentrated hot water of the past concentration of hot water. After the use of the concentrated hot water amount on the day ends, the control unit 36 sets the second starting hot water amount as the heat storage operation starting hot water amount. The second starting hot water amount is a value smaller than the first starting hot water amount. By controlling in this way, it is possible to reduce the amount of heat stored in the hot water storage tank 8 after the use of the concentrated hot water amount is finished while reliably suppressing the hot water shortage with respect to the concentrated hot water amount on the day, so that the heat storage operation is more than necessary. Implementation can be suppressed and energy saving can be improved.

  FIG. 3 is a schematic diagram showing temporal changes in the amount of hot water used and the amount of hot water at the start of the heat storage operation when forgetting to close the bathtub tap during hot water filling (that is, the bathtub tap is open) and hot water filling is performed again immediately after that. FIG. As shown in FIG. 3, when hot water is continuously applied twice due to forgetting to close the bathtub tap, the hot water storage tank 8 runs out of hot water due to the occurrence of a concentrated hot water amount larger than the past concentrated hot water amount learned. May occur. Therefore, in the first embodiment, when the control unit 36 determines that the bathtub tap is open at the time of hot water filling, the first starting hot water amount set on the basis of the learning value is set as the first starting hot water amount on that day. By increasing to a larger value, the amount of heat generated by the HP unit 7 in the heat storage operation on the day is increased. Thereby, even when hot water is continuously carried out twice due to forgetting to close the bathtub tap, the hot water tank 8 can be reliably prevented from running out of hot water. In this case, it is desirable that the control unit 36 sets a value that is larger by the amount of hot water corresponding to one hot water stroke than the first starting hot water amount set from the learning value as the first starting hot water amount for the day.

Forgetting to close the bathtub tap is a rare event. If the user forgets to close the bath tub at the time of hot water, the user is considered to be careful not to forget to close the bath tub after the next day. Therefore, it is considered extremely unlikely that forgetting to close the bathtub tap during hot water will be repeated in a short period of time. The controller 36 learned an excessive amount of concentrated hot water when the hot water beam was carried out twice consecutively due to forgetting to close the bathtub tap, and based on the excessive concentrated hot water amount, the first starting hot water amount for the following day was set. Then, the heat storage amount of the hot water storage tank 8 is ensured more than necessary. That is, since an amount of heat corresponding to one hot water beam is secured in the hot water storage tank 8, energy saving performance is reduced. Therefore, in the first embodiment, when it is determined that the bathtub tap is open at the time of hot water filling, the control unit 36 substantially invalidates the hot water beam in learning of the amount of hot water used. For example, the control unit 36 performs any of the following controls (1) to (3).
(1) When it is determined that the bathtub tap is open during hot water filling, the control unit 36 does not include the concentrated hot water amount of the day in the learning value.
(2) When it is determined that the bathtub tap is open at the time of hot water filling, the control unit 36 uses the amount obtained by subtracting the hot water amount corresponding to one hot water feeding from the concentrated hot water amount on the day as the learning value.
(3) When the control unit 36 determines that the bathtub tap is open at the time of hot water filling, when setting the first starting hot water amount after the next day, the maximum concentrated hot water amount (that is, the past concentrated hot water amount (that is, The first starting hot water amount is set based on the amount obtained by subtracting the hot water amount corresponding to one hot water beam from the concentrated hot water amount when the hot water beam is continuously carried out twice due to forgetting to close the bathtub tap.
By performing any one of the controls (1) to (3), the hot water beam that is determined to have the bathtub tap open can be substantially invalidated in learning the amount of hot water used. As a result, since it can suppress that the heat storage amount of the hot water storage tank 8 is ensured more than necessary after the next day, the energy-saving fall can be suppressed.

  FIG. 4 is a flowchart showing a control operation executed by the control unit 36 when hot water is applied in the hot water storage type water heater 35 of the first embodiment. In step S1 of FIG. 4, the user performs an operation to instruct hot water using the remote control device 44, so that the control unit 36 starts hot water. Although not shown in FIG. 4, after the hot water is started, the control unit 36 performs the priming operation described above, operates the bath circulation pump 29, detects the presence or absence of water flow with the water flow detection means 45, and It is determined whether or not bathtub water remains at 30. When it is determined that the bathtub water does not remain in the bathtub 30, the control unit 36 proceeds to step S2. The control unit 36 supplies the remaining set amount of hot water to the bathtub 30 in step S2, and proceeds to step S3.

  In step S <b> 3, the control unit 36 operates the bath circulation pump 29, and the water flow detection unit 45 detects the presence or absence of the water flow. When the water flow detecting means 45 detects the presence of water flow in step S3, it is considered that hot water (tub water) is accumulated in the bathtub 30, so that the bathtub plug is closed (do not forget to close the bathtub plug). Conceivable. In this case, the control unit 36 proceeds to step S4. After determining that the bathtub tap is closed in step S4 (do not forget to close the bathtub tap) in step S4, the control unit 36 proceeds to step S8 and ends hot water.

  On the other hand, when the water flow detecting means 45 detects no water flow in step S3, it is considered that hot water (tub water) is not accumulated in the bathtub 30, so the bathtub plug is open (the bathtub plug is forgotten to be closed). )it is conceivable that. In this case, the control unit 36 proceeds to step S5. The control unit 36 proceeds to step S6 after determining that the bathtub tap is open (forgetting to close the bathtub tap) in step S5. In step S6, as described above, the control unit 36 increases the first starting hot water amount of the day to a value larger than the first starting hot water amount set from the learning value. Next, the control unit 36 proceeds to step S7. In step S7, as described above, the control unit 36 invalidates the hot water beam determined to have the bathtub tap open in learning the amount of hot water used. Then, it transfers to step S8 and ends hot water.

  According to the first embodiment, when it is determined that the bathtub tap is open at the time of hot water filling, the amount of heat stored in the hot water storage tank 8 is reduced from the next day by invalidating the hot water beam in learning of the amount of hot water used. Since it can suppress securing more than necessary, the fall of energy saving property can be suppressed. In addition, if it is determined that the bathtub tap is open during hot water filling, the first start hot water amount on the day is increased to a value larger than the first start hot water amount set from the learning value, so that the heat storage operation on the day The amount of heat generated by the HP unit 7 is increased. Thereby, generation | occurrence | production of the hot water outflow when a hot water beam is implemented twice continuously by forgetting to close a bathtub stopper can be suppressed.

  When the controller 36 determines that the bathtub tap is open during hot water filling, instead of increasing the first starting hot water amount on the day to a value larger than the first starting hot water amount set from the learning value, The heat storage operation may be stopped immediately after the heat storage operation is started immediately and the amount of heat corresponding to one hot water beam is generated by the HP unit 7 and added to the hot water storage tank 8. Even with such control, it is possible to suppress the occurrence of running out of hot water when hot water is continuously applied twice due to forgetting to close the bathtub tap.

  The control unit 36 may notify the user that the heat storage operation is additionally performed when it is determined that the bathtub tap is open during hot water filling. As this notification means, for example, the fact that an additional heat storage operation is being carried out by removing a bathtub tap (for example, “A bathtub stopper has been detected. Additional heat storage operation is being performed to prevent running out of hot water”). You may display on the display part of the remote control apparatus 44, and you may alert | report with an audio | voice from the speaker of the remote control apparatus 44. FIG. By doing in this way, a user can be made to understand that implementation of an additional heat storage driving | operation is normal operation | movement, and a user's misunderstanding can be suppressed.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 5. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  Since the apparatus configuration of the hot water storage type hot water supply apparatus 35 of the second embodiment is the same as that of the first embodiment, illustration and description thereof are omitted. FIG. 5 is a flowchart showing a control operation performed by the control unit 36 when hot water is applied in the hot water storage type water heater 35 of the second embodiment. Steps S1 to S4 in FIG. 5 are the same as those in the first embodiment, and a description thereof will be omitted. If the controller 36 determines in step S4 that the bathtub tap is closed (do not forget to close the bathtub tap), the control unit 36 proceeds to step S10 and ends hot water.

  If the water flow detecting means 45 detects no water flow in step S3, there is a possibility that hot water (tub water) does not accumulate in the bathtub 30, so that the bathtub plug is open (forgetting to close the bathtub plug). there is a possibility. In this case, the control unit 36 proceeds to step S9. In step S9, the control unit 36 temporarily determines that the bathtub tap is open (there is a forgetting to close the bathtub tap). Then, it transfers to step S10 and ends hot water.

  The control unit 36 proceeds from step S10 to step S11. When it is temporarily determined in step S9 that the bathtub tap is open (there is a forgetting to close the bathtub tap), in step S11, the control unit 36 has a threshold (for example, 60 minutes) after the provisional determination. Determine if you have reached. If the elapsed time after provisional determination has not reached the threshold value in step S11, the control unit 36 proceeds to step S13. In step S <b> 13, the control unit 36 determines whether hot water is started, that is, whether a hot water instruction is input to the remote control device 44. If hot water is not started in step S13, the control unit 36 returns to step S11.

  If the elapsed time after the temporary determination reaches the threshold value in step S11 without starting hot water, the control unit 36 proceeds to step S12. In step S12, the control unit 36 cancels the provisional determination (step S9) that the bathtub tap is open (the forgetting to close the bathtub tap).

  On the other hand, when the hot water is started in step S13 before the elapsed time after the temporary determination reaches the threshold value in step S11, the control unit 36 proceeds to step S14 and has been described in the first embodiment. Perform the priming operation. Subsequently, the control unit 36 proceeds to step S <b> 15, operates the bath circulation pump 29, and detects the presence or absence of a water flow with the water flow detection means 45. When the presence of water flow is detected in step S15, the control unit 36 proceeds to step S16. In step S <b> 16, the control unit 36 determines that hot water (tub water) has accumulated in the bathtub 30 before the start of this hot water beam. In step S16, the control unit 36 may cancel the provisional determination (step S9) that the bathtub tap is open (forgetting to close the bathtub tap) during the previous hot water application.

  On the other hand, if no water flow is detected in step S15, it is considered that hot water (tub water) has not accumulated in the bathtub 30 before the start of the current hot water, so that the bathtub tap is open at the time of the previous hot water. It is considered that the provisional judgment (forgetting to close the bathtub tap) is correct. In this case, the control unit 36 proceeds to step S17. In step S <b> 17, the control unit 36 confirms the determination that the bathtub tap is open (the forgetting to close the bathtub tap) at the previous hot water application. Thereafter, the process proceeds to step S18. In step S18, the control unit 36 increases the first starting hot water amount of the day to a value larger than the first starting hot water amount set from the learning value. Next, the control unit 36 proceeds to step S19. In step S <b> 19, the control unit 36 invalidates the previous hot water beam determined that the bathtub tap is open in learning of the amount of hot water used.

  As described above, in the second embodiment, after tentatively determining in step S9 that the bathtub tap is open at the time of hot water filling, after the hot water is started again, the bathtub tap is opened at the previous hot water filling. The determination that there is is made to be finalized. If there is a clogged foreign substance in the bath circuit, even if hot water (tub water) accumulates in the bathtub 30, the water flow detection means 45 may detect the absence of water flow in step S3. For this reason, if the water flow detection means 45 detects that there is no water flow in step S3, it may be erroneously determined to immediately determine that the bathtub plug is open. According to the second embodiment, such erroneous determination can be reliably suppressed, and the open / close state of the bathtub tap during hot water can be determined with higher accuracy. Further, even when the bathtub tap is open at the time of hot water filling (forgetting to close the bathtub tap), it is conceivable that the second hot water heating is not performed. In such a case, it is not necessary to increase the first starting hot water amount. According to the second embodiment, after the second hot water is started, the first start hot water amount is unnecessarily increased by determining that the bathtub tap is open at the time of the previous hot water. Can be prevented. Therefore, an unnecessary heat storage operation can be suppressed when the second hot water is not carried out, and the energy saving property can be further improved.

  As mentioned above, although embodiment of the hot water storage type water heater of this invention was described, this invention is not limited to embodiment mentioned above. In the embodiment described above, the first starting hot water amount prepared for the maximum concentrated hot water amount of the learned past concentrated hot water amount is set, but the first prepared for the average value of the learned past concentrated hot water amount is set. The starting hot water amount may be set. In addition, the present invention is a hot water storage type hot water heater that learns the total amount of hot water used every day for a certain period in the past and controls the amount of heat corresponding to the maximum value or the average value to be stored in a hot water storage tank during nighttime heat storage operation. Is also applicable.

DESCRIPTION OF SYMBOLS 1 Compressor, 3 Water refrigerant | coolant heat exchanger, 4 Expansion valve, 5 Refrigerant piping, 6 Air heat exchanger, 7 HP unit, 8 Hot water storage tank, 8a Water inlet, 8b Water outlet, 8c Hot water inlet, 8d Hot water Inlet outlet, 9 water supply pipe, 9a first water supply pipe, 9b second water supply pipe, 9c third water supply pipe, 10 water outlet pipe, 11 three-way valve, 12 water pump, 13 hot water supply pipe, 14 HP outgoing pipe, 15 HP return pipe, 16 first bypass pipe, 17 second bypass pipe, 18 four-way valve, 20 utilization side heat exchanger, 20a hot water introduction pipe, 20b hot water outlet pipe, 21 hot water supply pipe, 22 hot water mixing valve, 23 bath Mixing valve, 24 First hot water supply pipe, 25 Second hot water supply pipe, 26 Solenoid valve, 27 Blow-out piping, 28 Blow return pipe, 29 Blow circulation pump, 30 Bathtub, 31 Pressure reducing valve, 33 Tank unit, 34 hot water tap, 35 hot water storage type hot water heater, 36 control unit, 37 bath temperature sensor, 38 bath return temperature sensor, 42, 43 hot water temperature sensor, 44 remote control device, 45 water flow detection means, 46 hot water flow rate sensor, 47 Flow sensor for bath

Claims (5)

Heating means for heating water;
A hot water storage tank for storing hot water heated by the heating means;
A control means having a function of determining the open / close state of the bathtub tap at the time of hot water in the bathtub, a function of learning a past amount of hot water used, and a function of controlling a heat storage amount of the hot water storage tank based on a learning value of the amount of hot water used; ,
With
When the control means determines that the bathtub tap is open at the time of hot water filling, the hot water storage type water heater invalidates the hot water beam in learning of the amount of hot water used.   The hot water storage hot water supply apparatus according to claim 1, wherein the control means increases the amount of heat generated by the heating means on the same day when it is determined that the bathtub tap is open at the time of hot water filling.   The hot water storage type hot water supply apparatus according to claim 1, wherein the control means starts a heat storage operation for storing heat in the hot water storage tank when it is determined that the bathtub tap is open at the time of hot water filling.   The control means, after tentatively determining that the bathtub tap is open at the time of hot water filling, and after the hot water beam is started again, determines that the bathtub tap is open at the previous hot water filling. The hot water storage type hot water supply device according to any one of claims 1 to 3.   5. The apparatus according to claim 1, further comprising notification means for notifying that the heat storage operation for storing heat in the hot water storage tank is additionally performed when it is determined that the bathtub tap is open at the time of hot water filling. The hot water storage type water heater according to one item.

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