JP5797998B2 - Heat pump type water heater - Google Patents

Description

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

  Conventionally, in this type of heat pump type hot water supply apparatus, a hot water storage tank connected to a hot water supply pipe and a hot water discharge pipe to store hot water, heating means for heating the hot water taken out from the lower part of the hot water storage tank and returning it to the upper part of the hot water storage tank, Boiling is started by the heating means at a predetermined time zone, and when the temperature of water entering the heating means exceeds the predetermined boiling end temperature, the boiling is terminated, and the temperature of the medium temperature water remaining in the hot water storage tank is reached. In response to this, there was one in which the boiling end temperature was changed to prevent boiling of the medium temperature water so as not to lower the heating efficiency of the heat pump.

JP 2005-49054 A

  However, in this conventional one, since the boiling end temperature is changed according to the temperature of the intermediate temperature water, the amount of boiling is reduced when a large amount of the intermediate temperature water remains, so the possibility of running out of hot water increases. There was a problem.

Therefore, in order to solve the above problems, the present invention provides a hot water storage tank in which hot water is stored by connecting a water supply pipe and a hot water discharge pipe, and hot water taken out from the lower part of the hot water storage tank to heat the hot water in the upper part of the hot water storage tank. Heat pump type heating means to be returned, start boiling by the heat pump type heating means in a predetermined time zone, and when the temperature of water entering the heat pump type heating means is equal to or higher than the predetermined boiling end temperature, Control means for determining the occurrence of intermediate temperature water in the hot water storage tank, the control means calculates the degree of variation in the amount of heat used per day for the past multiple days, and when the degree of variation is smaller than a predetermined value it is determined that the generation amount of medium-temperature water is small, and to change the predetermined boiling it away temperature, to a temperature lower than in the case of not determining that the generated amount of medium-temperature water is small

According to a second aspect of the present invention, a hot water storage tank in which hot water is stored by connecting a water supply pipe and a hot water discharge pipe, heat pump heating means for heating the hot water taken out from the lower part of the hot water storage tank and returning it to the upper part of the hot water storage tank, and a predetermined time The heating by the heat pump type heating means is started in the belt, and when the temperature of water entering the heat pump type heating means exceeds a predetermined boiling end temperature, the boiling is finished and the state of occurrence of medium temperature water in the hot water storage tank A bath heat circuit that connects the bath water to the tub and the bath heat exchanger so that the bath water can circulate. with the door, said control means continuously count bath heating amount is equal to or less than the threshold value are continuous past several days by reheating bath water, and, calculated on the basis of the use amount of heat per day over the past several days If the variation degree that is smaller than a predetermined value, determines that the generation amount of medium-temperature water is small, change to a lower temperature than if no is determined that the generation amount of medium-temperature water to the predetermined boiling it away temperature is less I did it.

Further, in claim 3, wherein the variation degree was to calculate the standard deviation of the running calorie per day over the past several days.

Further, in claim 4, wherein the variation degree was to be calculated from the difference between the maximum value and the minimum value of the used amount of heat per day over the past several days.

According to the present invention, if circumstances generation amount of hot water is smaller in the use pattern, such as using hot water is no variation in the daily constant as continues for a predetermined time period, by changing the boiling it away temperature lower temperature If, to prevent boiling of the hot water in at a given time period can be improved heating efficiency of the heat pump, whereas, in many cases the generation amount of the hot water in the usage patterns such as day-to-day use hot water varies, By changing the boiling end temperature to a high temperature, it is possible to boil up the medium-temperature water at the time of boiling in a predetermined time zone, and to ensure the amount of boiling to prevent hot water from running out. As described above, it is possible to perform boiling up optimally and efficiently in accordance with the use situation of the user while preventing hot water from running out.

The schematic block diagram of the heat pump type bath water heater of one Embodiment of this invention Flowchart for explaining the boiling operation of the first embodiment Flowchart for explaining the boiling operation of the second embodiment Flowchart explaining the boiling operation of the third embodiment Flowchart for explaining the boiling operation of the fourth embodiment

A heat pump type hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank for storing hot water (a tank capacity of 370 L in this case), 2 is a water supply pipe for supplying water to the hot water storage tank 1, 3 is a pressure reducing valve provided in the water supply pipe 2 for reducing the water supply pressure, and 4 is from the upper part of the hot water storage tank 1 A hot water discharge pipe 5 for discharging hot water is provided in the hot water discharge pipe 4 to release overpressure, 6 is a water supply bypass pipe branched from the water supply pipe 2 on the downstream side of the pressure reducing valve 3, and 7 is hot water from the hot water discharge pipe 4. A hot water supply mixing valve that mixes water from the water supply bypass pipe 6, 8 is a hot water supply pipe that supplies hot water from the hot water supply mixing valve 7, 9 is a hot water temperature sensor provided in the hot water supply pipe 8, and 10 flows through the hot water supply pipe 8. A hot water supply flow sensor for detecting the flow rate, 11 is a water supply temperature sensor for detecting the temperature of the water supply, and 12 is a hot water tap.

  13 is a bathtub, 14 is a bath heat exchanger provided in the upper part of the hot water storage tank 1, 15 is a bath circulation circuit that connects the bath 13 and the bath heat exchanger 14 so that the bath water can circulate, and 16 is a bath circulation. A bath circulation pump provided in the middle of the circuit 15, a bath return temperature sensor 17 for detecting the temperature of the bath water returning from the bathtub 13 to the bath heat exchanger 14, and a bath water 18 to the bath 13 from the bath heat exchanger 14. Bath temperature sensor for detecting temperature, 19 is a water level sensor for detecting the water level in the bathtub 13 by pressure, 20 is a hot water pipe branched from the hot water supply pipe 8 and connected to the bath circulation circuit 15, and 21 is a hot water pipe. This is a hot water solenoid valve that opens and closes 20.

  A plurality of hot water storage sensors 22 are provided on the upper and lower sides of the hot water storage tank 1 to detect the hot water storage temperature of each part. Here, the hot water storage temperature sensor 22a is 30L, the hot water storage temperature sensor 22b is 80L, the hot water storage temperature sensor 22c is 130L, The temperature sensor 22d detects the hot water storage temperature of 180L, the hot water storage temperature sensor 22e detects 230L, the hot water storage temperature sensor 22f detects 280L, and the hot water storage temperature sensor 22g detects the hot water storage temperature of 330L.

  23 is a heat pump heating means for heating the hot water in the hot water storage tank 1, a compressor 24 for compressing the refrigerant, and a refrigerant water heat exchanger 25 for exchanging heat between the compressed high-temperature refrigerant and the hot water from the hot water storage tank 1. An expansion valve 26 for reducing the pressure of the refrigerant radiated by the refrigerant water heat exchanger 25 and an air heat exchanger 27 as an evaporator for evaporating the low-temperature and low-pressure refrigerant are connected in an annular shape by a refrigerant pipe 28. The hot water taken out from the lower part of the hot water storage tank 1 is heated and returned to the upper part of the hot water storage tank 1 so that the amount of hot water to be heated can be freely controlled. . Reference numeral 29 denotes a blower fan that blows outside air as a heat source to the air heat exchanger 27.

  30 is a heating circuit that connects the lower part of the hot water storage tank 1 and the inlet of the refrigerant water heat exchanger 25, and connects the outlet of the refrigerant water heat exchanger 25 and the upper part of the hot water storage tank 1, and 31 is the inlet of the refrigerant water heat exchanger 25. The heating circulation pump provided in the heating circulation circuit 30 on the side circulates the hot water taken out from the lower part of the hot water storage tank 1 to the upper part of the hot water storage tank 1 through the refrigerant water heat exchanger 25, and 32 is the temperature of the hot water flowing into the refrigerant water heat exchanger 25 An incoming water temperature sensor 33 detects the temperature of hot water flowing out of the refrigerant water heat exchanger 25, and an outdoor air temperature sensor 34 detects the outside air temperature.

  Reference numeral 35 denotes a remote controller for performing hot water supply temperature and various necessary settings, a display unit 36 for displaying hot water set temperature and bath set temperature, a temperature setting switch 37 for setting hot water set temperature and bath set temperature, and bathtub 13. A flow switch 38 for performing a heat retention operation for a predetermined heat retention time following the filling of a predetermined amount of hot water to the water, a reheating switch 39 for performing a reheating operation for heating the bath water, and the amount of heat used from the hot water storage tank 1 At least two types of heating, a large mode that sets the required heat quantity (necessary heat quantity Q) the next day with a large margin for actual results and a low mode that sets the required heat quantity Q with a small margin for actual heat consumption A boiling mode switching switch 40 that switches the mode by manual operation is provided.

  41 is a control means for controlling the operation of the heat pump bath water heater, and stores a program for controlling the operation in advance and has a calculation, comparison, storage function, and count function. Hot water supply flow sensor 10, water supply temperature sensor 11, bath return temperature sensor 17, bathing temperature sensor 18, water level sensor 19, hot water storage temperature sensors 22 a to 22 e, incoming water temperature sensor 32, boiling temperature sensor 33, and outside air temperature sensor 34 The detected value is input, the hot water mixing valve 7, the bath circulation pump 16, the hot water solenoid valve 21, the compressor 24, the expansion valve 26, the blower fan 29, and the heating circulation pump 31 are controlled and heated. It controls hot water supply operation, bath heating operation, etc., and is connected to the remote controller 35 so as to be communicable.

<Hot-water supply operation>
Next, when the hot-water tap 12 is opened and the hot water flow rate sensor 10 detects a flow rate that is greater than or equal to the amount at which hot water supply can be started, the control means 41 sets the hot water temperature detected by the hot water temperature sensor 9 to the hot water set temperature set by the remote controller 35. Then, the opening of the hot water supply mixing valve 7 is adjusted so that hot water from the hot water supply pipe 4 and water from the hot water supply bypass pipe 6 are mixed to supply hot water at a hot water supply set temperature.

  At this time, the control means 41 converts the amount of heat used into a hot water supply amount of a predetermined temperature from the hot water supply temperature detected by the hot water supply temperature sensor 11, the hot water supply flow rate detected by the hot water supply flow rate sensor 11, and the hot water supply set temperature, and accumulates and stores them.

  When the flow rate detected by the hot water supply flow rate sensor 10 decreases to a flow rate less than an amount that can be regarded as a hot water supply stop, for example, when the hot water tap 12 is closed, the control means 41 ends the adjustment of the opening of the hot water supply mixing valve 7 and supplies hot water. finish.

<Water filling operation>
The case where the bath switch 38 of the remote controller 35 is turned on will be described. The control means 41 opens the hot water solenoid valve 21, and the hot water temperature detected by the hot water temperature sensor 9 is the bath set temperature set by the remote controller 35. The flow rate integrated value after opening the hot water solenoid valve 21 detected by the hot water supply flow sensor 10 is adjusted in advance by adjusting the opening of the hot water supply mixing valve 7 to fill the hot water of the bath set temperature. When the amount of hot water set in step S3 is reached, the hot water solenoid valve 21 is closed.

  At this time, the control means 41 converts the amount of used hot water supplied to the bathtub 13 from the hot water supply temperature detected by the hot water supply temperature sensor 11, the hot water supply flow rate detected by the hot water supply flow rate sensor 11, and the bath set temperature into the hot water supply amount of a predetermined temperature. And memorize it.

  When the hot water filling operation is completed, the control means 41 performs a heat insulation operation for a predetermined heat insulation time (for example, 2 hours). In this heat insulation operation, the bath circulation pump 16 is periodically driven to check the bath water temperature, and if it is less than the bath set temperature, the bath circulation pump 16 is continuously driven as the bath heating is requested, and the bath water is set to the bath. Heat to temperature. And when predetermined heat retention time passes since completion of hot water filling operation, the heat retention operation of bath water is not performed.

<Casting action>
When the reheating switch 39 of the remote controller 35 is turned on, the control means 41 performs a reheating operation for heating to the bath set temperature with a request for bath heating. When generated, the control means 41 starts to drive the bath circulation pump 16, circulates the bath water to the bath heat exchanger 14, and starts a bath heating operation for heating the bath water with the hot water stored in the hot water storage tank 1, When the bath return temperature sensor 17 detects a bath set temperature or higher, the bath circulation pump 16 is stopped and the bath heating operation is terminated.

<Boiling operation>
Next, a low-cost boiling operation at a low power charge unit price will be described based on the flowchart of FIG. Here, a description will be given based on a rate system in which the power unit price is lower than the other daytime hours in the midnight time zone from 23:00 to 7:00 the next morning, which is a predetermined time zone, but is not limited to this. It is also possible to use a fee system with a cheap midnight time zone from 22:00 to 8:00 the next morning.

  When the current time is 23:00 and the start time of the midnight time zone is reached (Yes in step S1), the control means 41 is set to the heating mode that has been set and the unit of the past several days accumulated and stored as the hot water supply load. The necessary heat quantity Q required for the next day is calculated and determined based on the heat quantity used (step S2). Here, the average value of the hot water supply amount converted into the predetermined temperature for the past one week, the value based on the standard deviation, and the allowance according to the type of the heating mode (for example, in the large mode, the heat amount for 100 L converted to 43 ° C., less In the mode, the required amount of heat Q is calculated and determined from the sum of the amount of heat of 43 L converted to 50 L).

  Next, the control means 41 determines the target boiling temperature Tset from the table data corresponding to the stored outside air temperature Ta according to the outside air temperature Ta detected by the outside air temperature sensor 34 (step S3). Here, the target boiling temperature Tset is 75 ° C. when the outside air temperature Ta is less than 10 ° C., and 70 ° C. when the outside air temperature Ta is 10 ° C. or more.

  Note that table data of the feed water temperature Tw and the target boiling temperature Tset is stored in advance in the control means 41 instead of the relationship data between the outside air temperature Ta and the target boiling temperature Tset. The target boiling temperature Tset may be determined based on the feed water temperature Tw detected by the hot water storage temperature sensor 22g or the incoming water temperature sensor 32.

  Then, the control means 41 calculates the target boiling amount V by dividing the required heat quantity Q by the value obtained by subtracting the feed water temperature Tw from the target boiling temperature Tset (step S4). At this time, the target boiling amount V is corrected in accordance with the position of the hot water storage temperature sensors 22a to 22g, and the calculated values are 130L for 130L or less, 180L for 130L or more and 180L or less, 230L or 230L for more than 180L and less than 230L. If it is less than 280L, 280L and more than 280L are determined by correcting 330L to be the target boiling amount V, and any one of hot water storage temperature sensors 22c to 22g corresponding to the determined target boiling amount V is determined. Let the hot water storage temperature sensor judge the end of boiling. When the necessary heat quantity Q is large, the shortage that cannot be heated up in the midnight time zone is boiled up in the daytime time zone heating operation.

  Next, the control means 41 calculates the remaining hot water amount Vz equal to or higher than the remaining hot water determination temperature (for example, 50 ° C.) based on the detected temperatures of the hot water storage temperature sensors 22a to 22g (step S5), and the remaining hot water amount from the target boiling amount V. Vz is subtracted to calculate the required boiling amount Vp (step S6).

  And the control means 41 calculates the variation degree of the usage-amount of heat | fever for every unit period (for example, 1 day) of the past predetermined period (for example, one week) (step S7). Here, the variation degree may be a standard deviation of the daily usage heat amount in the past week or the difference between the maximum usage heat amount and the minimum usage heat amount per day in the past week as a numerical value representing the variation degree. it can.

  Next, the control means 41 compares the numerical value representing the degree of variation calculated in step S7 with a predetermined value (step S8), and when the degree of variation is small, the amount of generated warm water over the past predetermined period. The predetermined boiling end temperature is changed to a low temperature (50 ° C. in this case) (step S9). On the other hand, if the degree of variation is large, it is determined that the amount of intermediate-temperature water generated is relatively large over the past predetermined period, and the predetermined boiling end temperature is changed to a high temperature (here, 60 ° C.) (step S10).

  Then, the control means 41 calculates the boiling time by dividing the boiling required amount Vp by the constant heating capacity of the heat pump type heating means 29, and calculates the boiling start time (peak) from the end time of the midnight time zone. (Shift time) is calculated (step S11).

  When the current time becomes the peak shift time (Yes in step S12), the heat pump heating means 23 and the heating circulation pump 31 are started to start the boiling operation at the target boiling temperature Tset determined in step S3. Then, the water taken out from the lower part of the hot water storage tank 1 is heated to hot water having the target boiling temperature Tset, returned from the upper part of the hot water storage tank 1 and stored in a stacked form (step S13).

  The hot water storage temperature sensors 22c to 22g (boiling end temperature sensors) corresponding to the target boiling amount V determined in step S4 detect the boiling end temperature determined in step S9 or S10, or the incoming water temperature sensor 32. When the boiling is completed by detecting the heating upper limit temperature (for example, 55 ° C.) or more (step S14), the heat pump heating means 23 and the heating circulation pump 31 are stopped and the boiling operation is finished ( Step S15), the flow of the boiling operation is finished (Step S16). On the other hand, when the current time reaches 7 o'clock, which is the end time of the midnight time zone (step S17), the heat pump heating means 23 and the heating circulation pump 31 are stopped and the boiling operation is finished (step S15). The raising operation flow is terminated (step S16).

  In this way, when the usage pattern is such that the amount of hot water used is constant and does not vary from day to day and the amount of generated medium-temperature water is low, the boiling end temperature is lowered (here, 50 ° C.). By changing to, the heating efficiency of the heat pump can be improved by preventing the boiling of medium temperature water in the midnight hours, while the amount of generation of medium temperature water is reduced in the usage pattern in which the amount of hot water used varies from day to day. In many cases, by changing the boiling end temperature to a high temperature, the medium-temperature water is also boiled at the time of boiling in a predetermined time zone, and the amount of boiling can be reliably secured to prevent hot water from running out. As described above, it is possible to perform boiling up optimally and efficiently in accordance with the use situation of the user while preventing hot water from running out.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same thing as previous embodiment, and the description is abbreviate | omitted.
In the second embodiment, the control means 41 determines the amount of medium-temperature water generated from the use of bathing water, and details of the determination will be described below.

  The control means 41 accumulates the bath replenishment time, which is the time when the bath water is heated by the bath heat exchanger 14 by the bath reheating operation or the bath heat retaining operation, and replenishes the bath renewal every day in the past week. The continuous number of times that the accumulated time of the time is less than or equal to the threshold is stored.

<Boiling operation>
Next, the boiling operation will be described based on the flowchart of FIG. 3 with a focus on the points different from the previous embodiment. After calculating the boiling required amount Vp in step S6, the process proceeds to step S18, and the control means 41 stores it. It is determined whether or not the number of consecutive times when the accumulated bath chasing time is equal to or less than the threshold value is seven, and if the number of consecutive times is seven (Yes in step S18), the process proceeds to step S9 and the predetermined boiling If the end temperature is 50 ° C. and the number of continuous times is less than 7 (No in step S18), the process proceeds to step S10, and the predetermined boiling end temperature is set to 60 ° C.

  In the subsequent boiling, whether the hot water storage temperature sensors 22c to 22g (boiling end temperature sensors) corresponding to the target boiling amount V determined in step S4 detect the boiling end temperature determined in step S9 or S10. Or, when the water temperature sensor 32 detects the heating upper limit temperature (for example, 55 ° C.) or higher and boiling is completed (step S14), the heat pump type heating means 23 and the heating circulation pump 31 are stopped to boil. The raising operation is terminated (step S15), and the flow of the boiling operation is terminated (step S16). On the other hand, when the current time reaches 7 o'clock, which is the end time of the midnight time zone (step S17), the heat pump heating means 23 and the heating circulation pump 31 are stopped and the boiling operation is finished (step S15). The raising operation flow is terminated (step S16).

  In this way, if the situation where the amount of generated medium-temperature water is low, such as a usage pattern that requires less time for bathing each day, continues for a predetermined period, by changing the boiling end temperature to a lower temperature, The heating efficiency of the heat pump can be improved by preventing the boiling of the medium temperature water in a predetermined time zone, while the amount of generated medium temperature water such as usage patterns that have a lot of time for bathing each day is reduced. In many cases, by changing the boiling end temperature to a high temperature, the medium-temperature water is also boiled at the time of boiling in a predetermined time zone, and the amount of boiling can be reliably secured to prevent hot water from running out. As described above, it is possible to perform boiling up optimally and efficiently in accordance with the use situation of the user while preventing hot water from running out.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same thing as previous embodiment, and the description is abbreviate | omitted.
In the third embodiment, the control means 41 determines the generation amount of the medium-temperature water from the degree of variation calculated based on the amount of heat used for each unit period of the past predetermined period and the use situation of bathing water replenishment. The details of the determination will be described below.

  The control means 41 calculates the heating amount of the bath water heated by the bath heat exchanger 14 by the bath reheating operation or the bath heat retention operation from the detected temperature of the bath return temperature sensor 17, the bath set temperature, and the bath reheating time. Accumulation is performed every day, and the number of consecutive times that the amount of bath heating per day during the most recent week is equal to or less than the threshold value is stored. The bath heating amount may be calculated or estimated by another known method.

<Boiling operation>
Next, the boiling operation will be described based on the flowchart of FIG. 4 with a focus on the differences from the previous embodiment. After calculating the boiling required amount Vp in step S6, the process proceeds to step S18, and the control means 41 stores it. It is determined whether or not the number of consecutive times when the integrated value of the bath heating amount is equal to or less than the threshold value is seven, and if the number of consecutive times is seven (Yes in step S18), the process proceeds to step S7, and the past predetermined number The degree of variation in the amount of heat used is calculated for each unit period (for example, one day) of the period (for example, one week). Here, the variation degree may be a standard deviation of the daily usage heat amount in the past week or the difference between the maximum usage heat amount and the minimum usage heat amount per day in the past week as a numerical value representing the variation degree. it can.

  Next, the control means 41 compares the numerical value representing the degree of variation calculated in step S7 with a predetermined value (step S8), and when the degree of variation is small, the amount of generated warm water over the past predetermined period. The predetermined boiling end temperature is changed to a low temperature (50 ° C. in this case) (step S9). On the other hand, if the degree of variation is large, it is determined that the amount of intermediate-temperature water generated is relatively large over the past predetermined period, and the predetermined boiling end temperature is changed to a high temperature (here, 60 ° C.) (step S10).

  If the integrated number of bath heating amounts stored in the control means 41 in step S18 is less than the threshold value is less than 7 (No in step S18), the process proceeds to step S10 and the predetermined boiling end is completed. Temperature is 60 ° C.

  In the subsequent boiling, whether the hot water storage temperature sensors 22c to 22g (boiling end temperature sensors) corresponding to the target boiling amount V determined in step S4 detect the boiling end temperature determined in step S9 or S10. Or, when the water temperature sensor 32 detects the heating upper limit temperature (for example, 55 ° C.) or higher and boiling is completed (step S14), the heat pump type heating means 23 and the heating circulation pump 31 are stopped to boil. The raising operation is terminated (step S15), and the flow of the boiling operation is terminated (step S16). On the other hand, when the current time reaches 7 o'clock, which is the end time of the midnight time zone (step S17), the heat pump heating means 23 and the heating circulation pump 31 are stopped and the boiling operation is finished (step S15). The raising operation flow is terminated (step S16).

  In this way, by determining that the usage pattern is such that the amount of hot water used is constant and does not vary from day to day, and the amount of heating required for bathing each day is small, the amount of generated medium-temperature water is small. There is a situation in which the amount of hot water generated is low and the usage pattern in which the amount of hot water used is constant and does not vary from day to day, and the amount of heating in the bath replenishment day is small. If it continues for a predetermined period, changing the boiling end temperature to a lower temperature can prevent the boiling of medium temperature water in a predetermined time zone and improve the heating efficiency of the heat pump. If the amount of hot water used varies, or if there is a large amount of medium-temperature water generated such that there is a large amount of heating for bathing each day, change the boiling end temperature to a higher temperature. Even boiling medium-temperature water during the boiling of the time zone, it is possible to prevent the hot water runs out reliably secure the amount of boiling. As described above, it is possible to perform boiling up optimally and efficiently in accordance with the use situation of the user while preventing hot water from running out.

  In addition, in judging the generation amount of intermediate temperature water from the usage condition of the bath water reheating, the second embodiment has been described with respect to the reheating time and the third embodiment as an example of the bath heating amount, but not limited thereto. The number of times the bath water is heated by the bath heat exchanger 14 in the bath chasing operation or the bath warming operation is accumulated every day, and whether or not the number of bath chasing times per day in the past week is below the threshold You may make it judge the generation amount of warm water.

<Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same thing as previous embodiment, and the description is abbreviate | omitted.
In the fourth embodiment, the control unit 41 determines the generation state of the medium temperature water based on the temperature detected by the hot water storage temperature sensor 22, and details of the determination will be described below.

  The control means 41 detects the remaining amount of hot water in the hot water storage tank 1 at the start of the midnight time zone by the hot water storage temperature sensor 22, and the remaining hot water amount in the hot water for each day in the past week is continuously below the threshold. The number of times is memorized.

<Boiling operation>
Next, the boiling operation will be described based on the flowchart of FIG. 5 with a focus on the differences from the previous embodiment. After calculating the boiling required amount Vp in step S6, the process proceeds to step S19, and the hot water storage temperature sensors 22a to 22c. The amount of remaining hot water (for example, the amount of hot water not lower than 50 ° C. and lower than 60 ° C.) is detected from the hot water storage temperature detected by g, and it is determined whether or not it is below a predetermined threshold.

  Then, in the following step S20, it is determined whether the number of consecutive times that the amount of remaining hot water of the medium-temperature water stored in the control means 41 is equal to or less than the threshold is seven, and if the number of consecutive times is seven (in step S20) Yes), the process proceeds to step S7, where it is determined that the amount of intermediate-temperature water generated is small over the past predetermined period, and the predetermined boiling end temperature is changed to a low temperature (here, 50 ° C.) (step S9). On the other hand, if the number of continuous times is less than 7 (No in step S20), the process proceeds to step S10 and the predetermined boiling end temperature is set to 60 ° C.

  In the subsequent boiling, whether the hot water storage temperature sensors 22c to 22g (boiling end temperature sensors) corresponding to the target boiling amount V determined in step S4 detect the boiling end temperature determined in step S9 or S10. Or, when the water temperature sensor 32 detects the heating upper limit temperature (for example, 55 ° C.) or higher and boiling is completed (step S14), the heat pump type heating means 23 and the heating circulation pump 31 are stopped to boil. The raising operation is terminated (step S15), and the flow of the boiling operation is terminated (step S16). On the other hand, when the current time reaches 7 o'clock, which is the end time of the midnight time zone (step S17), the heat pump heating means 23 and the heating circulation pump 31 are stopped and the boiling operation is finished (step S15). The raising operation flow is terminated (step S16).

  As described above, when it is reliably determined that the amount of intermediate warm water generated is small based on the hot water storage temperature before the start of boiling, and the state where the amount of intermediate warm water generated is low continues for a predetermined period, By changing the low temperature to a low temperature, it is possible to improve the heating efficiency of the heat pump by preventing the boiling of the medium temperature water in a predetermined time zone. By changing the high temperature to a high temperature, the medium-temperature water is also boiled at the time of boiling in a predetermined time zone, and the amount of boiling can be reliably ensured to prevent hot water from running out. As described above, it is possible to perform boiling up optimally and efficiently in accordance with the use situation of the user while preventing hot water from running out.

  In addition, this invention is not limited only to said embodiment, For example, you may make it use the incoming water temperature sensor 32 as a temperature sensor which determines boiling end temperature.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 4 Outlet pipe 13 Bath 14 Bath heat exchanger 15 Bath circulation circuit 22 Hot water temperature sensor 23 Heat pump type heating means 41 Control means

Claims (4)

A hot water storage tank in which hot water is stored by connecting a water supply pipe and a hot water discharge pipe, heat pump heating means for heating the hot water taken out from the lower part of the hot water storage tank and returning it to the upper part of the hot water storage tank, and the heat pump heating means in a predetermined time zone And the control means for determining the generation status of the medium temperature water in the hot water storage tank, and when the temperature of the water entering the heat pump heating means reaches or exceeds the predetermined boiling end temperature, The control means calculates the degree of variation in the amount of heat used every day for the past plurality of days, and determines that the amount of generated medium-temperature water is small when the degree of variation is less than a predetermined value, and determines the end of the predetermined boiling. The heat pump type hot water supply apparatus is characterized in that the temperature is changed to a temperature lower than that in the case where it is not determined that the amount of generated intermediate temperature water is small . A hot water storage tank in which hot water is stored by connecting a water supply pipe and a hot water discharge pipe, heat pump heating means for heating the hot water taken out from the lower part of the hot water storage tank and returning it to the upper part of the hot water storage tank, and the heat pump heating means in a predetermined time zone Control means for starting the boiling by the heat pump, and when the temperature of water entering the heat pump heating means is equal to or higher than a predetermined boiling end temperature, the boiling is finished, and the control means for judging the occurrence of medium temperature water in the hot water storage tank; A bath heat exchanger for chasing the bath water in the bathtub with hot water in the hot water storage tank; and a bath circulation circuit for connecting the bath and the bath heat exchanger so that the bath water can circulate, and the control means. a continuous number bath heating amount is equal to or less than the threshold value are continuous past several days by reheating bath water, and the dispersion degree calculated based on the running calorie per day over the past several days If less than value, it determines that the generation amount of medium-temperature water is small, that it has to be changed to a lower temperature than if no is determined that the generation amount of medium-temperature water to the predetermined boiling it away temperature is less A heat pump type hot water supply device.   The heat pump type hot water supply apparatus according to claim 1 or 2, wherein the degree of variation is calculated from a standard deviation of the amount of heat used every day for a plurality of past days.   3. The heat pump type hot water supply apparatus according to 1 or 2, wherein the variation degree is calculated from a difference between a maximum value and a minimum value of daily heat consumption for a plurality of days in the past.

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