JP5239407B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus that stores hot water heated by a heat pump heating device using a heat pump refrigeration cycle in a hot water storage tank and discharges hot water from the hot water storage tank.

  Conventional hot water supply devices are known that perform hot water boiling operation during daytime as well as operation for boiling all tanks in the midnight hours due to downsizing of equipment and diversification of usage patterns. (For example, refer to Patent Document 1).

  The apparatus described in Patent Document 1 sets the amount of remaining hot water at the start of hot water boiling operation and the amount of hot water at the time of stop in the daytime power hours so that the amount of hot water remaining during the hot water filling operation is maximized. This makes it easier to enter the hot water filling operation and secures the amount of hot water required for hot water filling, and by setting the heating capacity according to the value of the amount of remaining hot water to start, ensuring the hot water amount in an emergency and operating efficiency of the heating device We are trying to improve.

And in patent document 1, it describes as follows about the said amount of starting hot water according to time zone. That is, from 7 am to 10 am in the morning, a large amount of hot water is secured in the tank by the total amount boiling operation on the previous night, so the amount of remaining hot water is set low and it is difficult to enter the hot water boiling operation. Is set. Next, from 10:00 to 17:00, the amount of hot water used is the least during the day. Therefore, the amount of remaining hot water during this time is set lower than that from 7:00 to 10:00. Therefore, it is set in a state where it is more difficult to enter a hot water boiling operation. Furthermore, in the time zone when hot water usage is the largest in the day from 17:00 to around 20:00 including the bathing time zone, the amount of remaining hot water for starting is set to the highest level, so that you can prepare for bathing. It is set in a state where it is most likely to enter the hot water boiling operation so as to ensure the amount of remaining hot water.
JP 2007-218520 A

  However, there are various patterns in which the user actually uses hot water, and the apparatus described in Patent Document 1 is not sufficient to cope with various usage patterns, and there is a problem that a hot water outage may occur. there were. In other words, the user's usage patterns are diversification of the user's lifestyle (morning activity type, night activity type, etc.), the family structure of users who use one water heater (large generations of large families, nuclear families, etc.) ) Etc., it is not always uniform. For example, when there is a situation where a large amount of hot water peculiar to the user is used, the control based on the uniform pattern may cause hot water to run out.

  The present invention has been made in view of the above-described problems. By carrying out a reheating operation according to the use record of the user, the occurrence of hot water is reduced and the operation efficiency of the heat pump heating device is improved. It aims at providing a hot-water supply apparatus.

  In order to achieve the above object, the following technical means are adopted. That is, the first invention related to the hot water supply apparatus heats water using a heat pump refrigeration cycle, the heat pump type heating apparatus (10) having a maximum capacity of 7 kW or more, and a capacity of 200 L or less, The operation results of the hot water storage tank (11) for storing the water heated by the heat pump heating device (10) for use in the hot water supply to the hot water supply use side terminal and the heat pump heating device (10) in the past predetermined period. And a control device (8, 12) for storing and controlling the heating operation of the heat pump heating device (10).

Furthermore, the control device (8, 12) calculates the required amount of hot water filling per day from the past operation results for a predetermined period, and uses only the calculated required heat amount of hot water filling per day, using the heat pump heating device (10). To calculate the target boiling temperature (TP). Further, the control device (8, 12) obtains the amount of heat used for hot water supply from the past operation results of a predetermined period, predicts the amount of heat used for hot water supply per day from the obtained amount of heat used for hot water supply, and calculates the amount of heat used for hot water supply per day. Using the amount of heat obtained by subtracting the amount of heat boiled in the midnight time zone from the predicted value, the operating time of the boiling-up operation of the heat pump heating device (10) performed in the time zone after the midnight time zone is calculated. Further, the control device (8, 12) is configured to increase the boiling capacity of the heat pump type heating device (10) in a plurality of time zones set in one day and the amount of stored hot water stored in the hot water storage tank (11). And decide based on.

According to the present invention, since only the necessary amount of heat per day based on the past results is reflected in the target boiling temperature TP, the reheating operation in consideration of the use form unique to the user that deviates from the general use form is performed. Can be implemented. Therefore, by performing the reheating operation reflecting the usage results of various users, it is possible to reduce the occurrence of hot water shortage and to improve the operation efficiency of the heat pump heating device. In addition, it is possible to provide a hot water supply apparatus that has both the downsizing of the entire apparatus and high comfort with less hot water. In addition, according to the present invention, by subtracting the amount of heat heated in the midnight time zone from the predicted value of the amount of heat used for hot water supply per day, it is possible to carry out a reheating operation reflecting the usage results of various users. Cuts can be reduced and the operating efficiency of the heat pump type heating device can be improved. In addition, according to the present invention, control reflecting the operation specifications corresponding to the time zone and the hot water storage heat amount of the tank is introduced in the reheating operation, so that further improvement in operation efficiency and user convenience are achieved. Can be provided.

  Moreover, it is preferable that a control apparatus (8, 12) changes the start conditions and completion | finish conditions of a heating increase operation of a heat pump type heating apparatus (10) according to the several time slot | zone set in one day. According to this invention, it is possible to provide improved driving efficiency and user-friendliness by introducing operating specifications for each additional time zone into the additional heating operation.

  In addition, the code | symbol in the bracket | parenthesis of each said means has shown the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A schematic configuration of a hot water supply apparatus according to a first embodiment which is an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a configuration of a hot water supply apparatus according to the present embodiment. As shown in FIG. 1, the hot water supply device includes a heat pump unit 10 that is a heat pump type heating device, a hot water storage tank 11 that stores water heated by the heat pump unit 10, a tank unit that includes piping, various valves, and the like. Yes. The control unit of the hot water supply device controls the heating operation of the heat pump unit 10 by communication with the system control device 12 that receives a command signal from the hot water supply operation remote controller 30 and controls the system of the entire hot water supply device, and the system control device 12. And a heat pump control device 8. The tank unit and the heat pump unit 10 are configured so as to be integrated or separated from each other at the installation site.

  The heat pump unit 10 includes at least a compressor 1, a water / refrigerant heat exchanger 2 that is a heat exchanger for heating, a decompression device 3, an evaporator 4, and a gas-liquid separator 7 and the like. It is formed by being connected. Further, a blower 5 that provides forced air to the evaporator is provided in the vicinity of the evaporator 4, and a temperature sensor 6 that detects the temperature of the forced air by the evaporator 4 (outside air temperature) is provided. In this embodiment, the heat pump unit 10 uses a carbon dioxide having a low critical temperature as a refrigerant to constitute a supercritical heat pump cycle in which the refrigerant pressure on the high pressure side becomes equal to or higher than the critical pressure of the refrigerant. The heat pump unit 10 preferably has a maximum capacity of 7 kW or more.

  When the heat pump cycle is constituted by a supercritical heat pump cycle, hot water having a temperature higher than that of a general heat pump cycle, for example, about 85 ° C. to 90 ° C. can be stored in the hot water storage tank 11. The heat pump unit 10 is configured to operate according to a control signal from the heat pump control device 8 and to output the operation state to the heat pump control device 8. The heat pump unit 10 uses a midnight power in the midnight time zone, which is inexpensive to set a fee, to boil up the hot water in the hot water storage tank 11, and to boil based on control specifications described later in a time zone other than the midnight time zone. Raise the drive.

  The heat pump control device 8 receives the hot water supply operation information instructed by the hot water supply operation remote controller 30 via the system control device 12, and based on the temperature information from the temperature sensor 6, the water temperature thermistor 31, the water temperature thermistor 32, etc. The opening of the variable pressure reducing device 3 included in the heat pump unit 10, the discharge capacity of the compressor 1, etc. so that the temperature of hot water heated up (hereinafter, the temperature of the hot water is referred to as hot water temperature) becomes a target value. To control.

  The hot-water supply operation remote controller 30 is an operation panel that is operated when a user uses the hot-water supply device. Each operation switch and display unit are provided, and are installed on a wall surface in a bathroom or a place where hot water is used such as a kitchen. . The system controller 12 includes a hot water supply operation remote controller 30, water temperature thermistors 31, 32, water supply temperature thermistor 33, hot water temperature thermistor 34, hot water temperature thermistor 35, tank water temperature thermistors 36a to 36e, other thermistors (not shown), and a flow rate counter (not shown). The flow rate information is received, and the control of the circulation pump 13, the switching valves 14 and 21, the mixing valve 22, etc. and the control of the heat pump unit 10 via the heat pump control device 8 are performed according to the procedure described later. It is configured to be able to.

  The hot water storage tank 11 is a metal container having excellent corrosion resistance, for example, a stainless steel container, and a heat insulating material (not shown) is arranged on the outer peripheral portion, so that hot water for hot water supply can be kept warm for a long time. ing. The hot water storage tank 11 preferably has a capacity of 200 L or less, and a 185 L tank is adopted in this embodiment. The hot water storage tank 11 has a vertically long shape, and an introduction port is provided on the bottom surface thereof. An introduction pipe 17 that is a water supply path for introducing tap water into the hot water storage tank 11 is connected to the introduction port. A feed water temperature thermistor 33 and a flow rate counter (not shown) are provided on the upstream side of the introduction port, and the temperature information and the flow rate information are output to the system controller 12. Further, a pressure reducing valve (not shown) for reducing the pressure of tap water flowing through the introduction pipe 17 to a predetermined pressure is provided on the upstream side of the introduction port.

  A plurality of tank water temperature thermistors are provided on the outer wall surface of the hot water storage tank 11, and the tank water temperature thermistors 36a, 36b, 36c, 36d, and 36e are arranged in order from the upper part of the tank to the lower part. The tank water temperature thermistors 36a to 36e are arranged so that the amount of water stored from the uppermost part in the tank becomes 20L, 50L, 90L, 130L, 165L in order from the upper part, and each water level filled in the upper part of the hot water storage tank 11 is set. The temperature information at the level is output to the system control device 12. Based on the temperature information from the tank water temperature thermistors 36a to 36e, it is possible to detect the temperature boundary position between the heated water heated in the upper part of the hot water storage tank 11 and the water before heated in the lower part of the tank. For example, if the detected temperature of a certain tank water temperature thermistor exceeds a predetermined temperature that can be used as the amount of stored hot water (for example, 50 ° C.), hot water that can be used for hot water is stored from the top of the tank to the position of the tank water temperature thermistor. Will be.

  An upper outlet port is provided in the upper part of the hot water storage tank 11, and an intermediate part outlet port for discharging medium temperature hot water in the hot water storage tank 11 is provided in the intermediate part of the hot water storage tank 11. Both outlets communicate with a hot water supply pipe 19 which is a hot water supply path for extracting hot water in the hot water storage tank 11. The hot water supply pipe 19 is a pipe that connects a hot water use side terminal such as a hand-washing stopper, a shower, and a bathtub to the upper outlet. The intermediate outlet port is connected to the hot water supply pipe 19 by a medium hot water pipe 20. A switching valve 21 is provided at the junction of the intermediate temperature water pipe 20 and the hot water supply pipe 19 to switch between hot water led out from the upper outlet and hot water led out from the intermediate outlet. ing. The switching valve 21 may be a mixing valve.

  A downstream end of a water supply pipe 18 branched from the introduction pipe 17 is connected to the hot water supply pipe 19 on the downstream side of the junction with the medium-temperature water pipe 20. This connection portion is provided with a mixing valve 22, which mixes the hot water flowing through the hot water supply pipe 19 in order to set the temperature of the hot water sent to the hot water supply use side terminal on the downstream side to an appropriate temperature state such as a set temperature. The ratio of the amount of water and the amount of water supplied through the water supply pipe 18 is controlled to mix hot water and water. The piping on the outlet side of the switching valve 21 is provided with a hot water temperature thermistor 34 that detects the temperature of hot water, and the piping on the outlet side of the mixing valve 22 is provided with a hot water temperature thermistor 35 that detects the temperature of hot water. . The opening degree of the switching valve 21 and the mixing valve 22 is controlled by the system control device 12 using information detected by the thermistors 34 and 35 and the flow rate counter.

  The lower surface of the hot water storage tank 11 is provided with an outlet for sucking out water in the tank, and the upper surface of the hot water storage tank 11 is provided with an inlet for allowing hot water heated by the heat pump unit 10 to flow into the tank. ing. The outflow port and the inflow port are communicated with each other by a circulation circuit 15 constituted by a return pipe and a forward pipe. The heating means arranged in the heat pump unit 10 is the water / refrigerant heat exchanger 2. The water passage 2 b of the water / refrigerant heat exchanger 2 constitutes a part of the circulation circuit 15.

  The circulation circuit 15 includes a circulation pump 13 that is a forced circulation means between the heat pump unit 10 and the hot water storage tank 11 on the upstream side of the heat pump unit 10. The rotation speed of the circulation pump 13 is controlled by the system controller 12 so that the hot water temperature heated by the heat pump unit 10 becomes a target value. The circulation circuit 15 branches between the heat pump unit 10 and the hot water storage tank 11 on the downstream side of the heat pump unit 10, a pipe that reaches the inlet of the hot water storage tank 11, and a supply pipe 16 that is connected to the lower part of the hot water storage tank 11. doing. A switching valve 14 is provided at this branching portion, and the switching valve 14 allows the hot water boiled by the heat pump unit 10 to flow into the hot water storage tank 11 from the upper part or distributes the supply pipe 16 into the hot water storage tank 11. It can be switched whether it flows from the lower part. A water temperature thermistor 31 for detecting the temperature of the water flowing into the water / refrigerant heat exchanger 2 is provided upstream of the water / refrigerant heat exchanger 2 in the circulation circuit 15. A water temperature thermistor 32 that detects the temperature of the water that has passed through the water / refrigerant heat exchanger 2 is provided downstream of the vessel 2 and upstream of the switching valve 14.

  The water / refrigerant heat exchanger 2 heats the water in the hot water storage tank 11 flowing through the water passage 2b sucked from the outlet through heat exchange with the high-temperature refrigerant flowing through the refrigerant passage 2a, and then enters the hot water storage tank 11 from the inlet. By returning to, a hot water layer can be formed in the hot water storage tank 11 from the top to the bottom.

  Next, the operation and control of the water heater in the above configuration will be described. The system control device 12 stores the actual amount of heat used as hot water (for example, the operation result of the heat pump unit 10, the hot water supply result corresponding to hot water filling, etc.) continuously in the storage means. The storage means is composed of, for example, a flash memory or a RAM, and reads and writes stored data. And the memory | storage means of the system control apparatus 12 can memorize | store the track record of the past used heat amount including the driving | operation track record of the heat pump unit 10 for a predetermined period.

  In the present embodiment, the record of the amount of heat used for the past one week is stored as an example of the predetermined period. And the actual heat consumption for one week is the timing when the most recent one-day record is stored, the most recent one-day record is erased from the storage means, and the most recent one-day record is written. become.

  The system control device 12 of the present embodiment performs the operation results of the heat pump unit 10 in the past one week, which is an example of a past predetermined period, in order to perform an efficient boiling operation that eliminates running out of hot water and useless operation ( Hereinafter, the control for calculating the target boiling temperature TP when the boiling operation is performed using the necessary amount of heat required for filling water per day calculated from the past one week operation results) is executed. Moreover, the system control apparatus 12 of this embodiment performs control which calculates the target boiling temperature TP at the time of performing a heating operation based on the presence or absence of the performance equivalent to the hot water filling in the operation performance of the past one week. .

  2 and 3 are flowcharts showing the control procedure of the hot water supply apparatus. First, when it is confirmed in Step 1 that the electricity rate is in the midnight time zone (23:00), which is an inexpensive setting, it is next determined whether there has been a performance equivalent to hot water filling from the past one week's operation results. (Step 2). A performance equivalent to a hot water bath is a track record of using a large amount of hot water that fills the bathtub. For example, a track record of starting the hot water bath from a state where there is no hot water in the bathtub and completing the hot water bath ( (This is referred to as Case 1) and the fact that the hot-water supply to the hot-water supply side terminal is continuously performed and the amount of hot-water discharge exceeds 100L (this is Case 2. This is not the supply of hot water to the bathtub, but the shower. The system control device 12 determines that there has been a hot water supply performance equivalent to a hot water filling if at least one of the results is stored.

  And when neither case 1 nor case 2 is memorize | stored, it determines with having not the hot water supply performance equivalent to hot water filling, and when the system control apparatus 12 performs a boiling operation later (at the time of a boiling increase operation) The target boiling temperature TP is determined to be a predetermined temperature of 65 ° C. (step 3), and then the determination of step 6 described later is executed. As described above, when there has not been a hot water supply equivalent to hot water filling in the past, the user determines that the amount of heat that must be newly supplied into the hot water storage tank 11 is not large, and the target boiling temperature TP is kept constant. By controlling to this predetermined value, hot water runs out and efficient operation is performed. Further, when the target boiling temperature TP is set to 65 ° C., the power saving operation can be performed while ensuring the minimum amount of stored hot water (for example, 60 ° C.) in the hot water storage tank 11, and the COP (coefficient of performance) of the heat pump unit 10 can be improved. can get.

  On the other hand, if it is determined that there has been a hot water supply performance equivalent to hot water filling, the system control device 12 calculates the amount of heat required for hot water filling per day (step 4). The amount of heat required for filling the hot water per day is calculated based on the past week's operation results. If it falls under Case 1, the hot water filling is completed to the value obtained by subtracting the feed water temperature from the hot water filling temperature set by the user. It can be obtained by multiplying the predicted amount of hot water, and in the case of Case 2, it can be obtained by calculating the amount of heat used which was necessary at the time of continuous hot water exceeding 100 L stored as a result. Further, when the system control device 12 recognizes that both cases 1 and 2 have a track record in step 2, it calculates the amount of heat required for hot water filling per day corresponding to each case, and among the obtained values The larger one is used as the required amount of heat per day. Moreover, the amount of heat required for hot water filling per day can be calculated by using the actual results such as the number of hot water fillings and the amount of heat required for each hot water filling in the past week.

  Next, the system control device 12 calculates the target boiling temperature TP during the boiling operation (step 5). That is, by using the required amount of hot water filling per day obtained in step 4, the hot water heat amount is rebated by the amount of hot water that fills the hot water storage tank 11, and the target boiling temperature TP is calculated.

  Next, the system controller 12 determines the state of the hot water in the hot water storage tank 11 (the temperature of the remaining hot water, the amount of hot water stored, the amount of stored heat) based on the detected temperature of the tank water temperature thermistors 36a to 36e that detect the current hot water temperature in the hot water storage tank 11. ) Is detected. In step 6, the amount of hot water stored in the hot water storage tank 11 is the minimum hot water storage amount (from 23:00 to 7:00 in the next morning) of the operation / stop control (see FIG. 4) according to time of the heat pump unit 10. Is greater than 50L). FIG. 4 is a control specification diagram showing the specification of the operation / stop control according to time of the heat pump unit 10.

  When it is determined that the amount of hot water stored in the hot water storage tank 11 (the amount of hot water in the tank) is not larger than the minimum hot water storage amount for the operation / stop control for each time zone, If the minimum amount of stored hot water is not stored, the operation is started with the heat pump capacity of 7.5 kW shown in FIG. Thereafter, the operation / stop control for each time zone is executed according to the control specification diagram of FIG. 4 (step 7).

  Here, the specification of the operation / stop control for each time zone will be briefly described with reference to FIG. As shown in FIG. 4, in this control, when the amount of hot water remaining in the hot water storage tank 11 is less than 50 L from 7 o'clock to 23 o'clock, the boiling operation is performed with a heat pump capacity of 7.5 kW regardless of the hot water storage amount. Is started. And this boiling operation is stopped when the amount of hot water storage becomes 90L. In addition, there are a plurality of conditions for starting the boiling operation. The remaining hot water storage amount is less than 50 L, the hot water storage amount is less than 130 L from 7 o'clock to 10 o'clock, and the required boiling increase time Tu is 15 The time when the condition of greater than the minute is satisfied, the amount of stored hot water is less than 90 L from 10:00 to 17:00, and the condition that the Tu is greater than 15 minutes is satisfied, from 17:00 to 23:00 Up to is when the condition that the amount of stored hot water is less than 130 L and Tu is greater than 15 minutes is satisfied. As described above, when the boiling operation is started while satisfying the start condition set for each time zone, the operation is continued until the amount of stored hot water is 165 L or more and Tu becomes 0 minute.

  Furthermore, from 23:00 to 7:00 of the next morning, when the remaining hot water storage amount becomes less than 50 L, the boiling operation is started with a heat pump capacity of 7.5 kW regardless of the hot water storage amount. And this driving | operation is stopped when it becomes 90L. In addition, another starting condition for the boiling operation is when the hot water storage tank 11 is predicted to be full at 7 o'clock, and the heat pump capacity at this time is such that the remaining hot water storage amount is less than 50L. The case is 6.0 kW, and the case of 50 L or more is 4.5 kW. This operation is terminated when the amount of stored hot water is 165 L or more and Twi (the detected temperature of the water temperature thermistor 31) exceeds 50 ° C.

  As described above, in the operation / stop control for each time zone, the control device determines the capacity of the reheating operation based on a plurality of time zones set in one day and the amount of stored hot water stored in the hot water storage tank 11. ing. As a result, it is possible to perform a reheating operation in which the specification corresponding to the time zone and the viewpoint of the amount of stored hot water in the tank are introduced, so that it is possible to further improve the operation efficiency and provide the user with good usability. Further, in the operation / stop control according to time zone, the control device changes the start condition and end condition of the heating operation according to a plurality of time zones set in one day. According to this control, since the operation specifications for each time period are further introduced into the reheating operation, it is possible to improve the operation efficiency and the user-friendliness.

  When the system controller 12 determines in step 6 that the amount of hot water stored is greater than the minimum amount of hot water stored in the operation / stop control for each time zone of the heat pump unit 10 (50 L from 23:00 to 7:00 the next morning) Monitoring of the amount of hot water stored in the remaining hot water is continued (step 8), and when the next time is 2 o'clock on the next day, a predicted value of the amount of heat used per day is calculated (step 9 and step 10). The predicted value of the amount of heat used per day is obtained by first calculating the amount of heat used for hot water supply from the past one week of operation results, and calculating the average value of the amount of heat used per day from the amount of heat used for this week. It is calculated by adding a predetermined amount of heat to. By adding this predetermined amount of heat, the predicted value of the amount of heat used per day becomes larger than the average value per day based on past results, and the predicted value can be widened. For this reason, even if the user's future usage pattern is somewhat different from the past, the possibility of running out of hot water can be reduced.

  Further, the system control device 12 calculates the time (necessary boiling time) required for completion of boiling when the boiling operation is performed with the minimum capacity (for example, 4.5 kW) of the heat pump unit 10 in Step 11. . This minimum capacity is an ability to complete boiling at 7 o'clock, and is an ability to achieve both high efficiency of the heat pump unit 10 and power saving using midnight power. Next, by calculating backward from 7 o'clock and determining that it is time to start the boiling operation with the minimum capacity (step 12), the boiling operation with the minimum capacity is started (step 13). Then, at 7 o'clock or when the above-mentioned condition for terminating the operation / stop control according to time period is satisfied, the boiling operation with the minimum capacity is stopped (steps 14 and 15).

  Next, the system control device 12 compares the predicted value of the hot water use heat amount per day calculated in step 10 with the stored hot water amount (accumulated heat amount) of the hot water storage tank 11, and the predicted value of the hot water use heat amount per day is greater. It is determined whether or not it is larger (step 16). If it is determined that the predicted value of the amount of heat used for hot water supply per day is larger, the required boiling increase time Tu is calculated in step 17. On the other hand, if it is determined that the predicted value of the amount of heat used for hot water supply per day is not larger, step 17 is skipped and the routine jumps to step 18 to execute the above-described operation / stop control according to time zone (see FIG. 4).

  The necessary boiling increase time Tu is an operation time when the operation satisfying the target boiling temperature TP calculated in step 5 is performed. Furthermore, the required boiling increase time Tu is calculated using the amount of heat obtained by subtracting the amount of heat heated up in the past midnight time from the predicted value of the amount of heat used for hot water supply per day calculated in step 10.

  Further, the required boiling increase time Tu may be calculated by the following method. First, the amount of heat used for hot water supply per day and the amount of heat used for hot water filling per day are obtained from the operation results for the past week, and in step 10, the amount of heat used for hot water filling per day is subtracted from the amount of heat used for hot water supply per day. Calculate the predicted value of the amount of heat used for hot water supply. Then, using the amount of heat obtained by subtracting the amount of heat heated in the midnight time zone from the predicted value of the amount of heat used for hot water supply per day, the required boiling increase time Tu is calculated.

  Next, the system control device 12 determines whether or not the hot water filling operation for the bathtub has been started (step 19). The hot water filling operation is started when a hot water filling operation command is sent from the hot water supply operation remote controller 30. Step 19 is repeated until an instruction for hot water filling operation is sent. When it is determined in step 19 that the operation is started, it is next determined in step 20 whether or not there is remaining hot water in the bathtub. When it is determined that there is hot water remaining in the bathtub, the hot water filling operation / stop control of the heat pump unit 10 according to the control specification diagram of FIG. 4 is executed (step 21).

  Here, the specifications of the hot water filling operation / stop control will be briefly described with reference to FIG. As shown in FIG. 5, in this control, when the amount of hot water remaining in the hot water storage tank 11 is less than 50 L, the water is heated with a heat pump capacity of 7.5 kW regardless of the amount of hot water stored in the tank or the remaining hot water in the bath. Operation starts. The boiling operation is finished when the amount of stored hot water is 165 L or more, or when the required boiling increase time Tu becomes 0 minutes. The starting condition other than the amount of hot water stored in the tank being less than 50 L is that the remaining hot water in the bath is detected, and if there is remaining hot water in the bath, the amount of hot water stored is less than 130 L, and Tu. Is when any of the conditions is greater than 15 minutes.

  Next, when it is determined in step 20 that there is no remaining hot water in the bathtub, the system control device 12 executes the hot water filling operation / stop control in step 22 shown in FIG. In the hot water filling operation / stop control in step 22, the boiling operation is performed so as to satisfy the target boiling temperature TP calculated in step 5, and this operation satisfies the stop condition for the completion of the boiling operation (see FIG. 5). (Step 23). When the system control device 12 determines that the stop condition is satisfied, the system control device 12 shifts to the above-described operation / stop control according to time zone (see FIG. 4) (step 24) and continues this control until 22:59 (step step). 25).

  The hot water supply apparatus of the present embodiment includes a heat pump unit 10 having a maximum heat pump capacity of 7 kW or more, and a hot water storage tank 11 having a capacity of 200 L or less. The control device of the hot water supply device calculates the required amount of hot water filling per day from the past operation results for the past week, and calculates the target boiling temperature TP during the reheating operation using the calculated required heat amount of hot water filling per day. . According to this control, the target boiling temperature TP is reflected in the required amount of hot water filling per day based on past results, so that even users with specific usage patterns do not suffer from problems such as running out of hot water, High comfort and improved efficiency of the heat pump unit 10 can be provided. In addition, according to the above control, even if the hot water storage tank 11 has a small capacity of 200 L, the maximum capacity of the heat pump is 7 kW or more. A water heater can be provided.

  Further, the control device for the hot water supply device determines whether or not there has been a hot water supply performance corresponding to the hot water filling from the operation results for the past one week, and based on the presence or absence of the determined hot water supply performance corresponding to the hot water filling, Determine the boiling temperature TP. According to this control, it is possible to perform a boiling operation that takes into account a large factor that leads to the occurrence of hot water shortage, which is the result of hot water filling. Therefore, it is possible to provide high comfort and improved efficiency of the heat pump unit 10 without causing problems such as running out of hot water even for users having specific usage forms.

  In addition, when it is determined that there has been a hot water supply performance equivalent to hot water filling in the past week, the control device of the hot water supply device calculates the required amount of hot water filling per day from the past operation results, and calculates the calculated hot water per day. The target boiling temperature TP during the boiling increase operation is determined using the necessary heat amount of tension. By this control, the target boiling temperature TP reflecting the amount of heat used corresponding to the hot water filling is determined, and it is possible to carry out the boiling increase operation in consideration of a large factor that leads to the occurrence of hot water shortage. In addition, it is possible to expect a further effect of suppressing the hot water out of the usage pattern specific to the user.

  In addition, the control device of the hot water supply device performs hot water operation that reflects the usage results of various users by reflecting the usage results of hot water supply per day by reflecting the actual usage of hot water supply for the past week. The occurrence of cutting can be reduced. In addition, the operation efficiency of the heat pump unit 10 can be improved by calculating the heating operation time by using the calorific value calculated by excluding the calorific value boiled in the midnight time zone from the predicted value of the calorific value used per day. it can.

  In addition, the control device of the hot water supply device obtains the amount of heat used for hot water supply per day and the amount of heat used for hot water filling per day based on the past hot water use results for the past week, and the amount of hot water used per day based on the amount of heat used for hot water supply per day. By predicting the amount of heat used for hot water supply per day by subtracting the amount of heat used for tension, it is possible to provide a reheating operation that can further reflect the actual usage of various users. This can further reduce the possibility of running out of hot water. Further, by calculating the heating operation time using the calorific value calculated by excluding the calorific value boiled up in the midnight time zone from the predicted value of the daily calorific value obtained in this way, the heat pump unit 10 Operation efficiency can be improved.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, the record of the amount of heat used as hot water (for example, the operation record of the heat pump unit 10, the record of hot water supply equivalent to hot water filling, etc.) is stored in the storage means of the system control device 12. The heat pump control device 8 having the storage means may be stored.

  2 is only an example of a predetermined time, and is not limited to this time.

  In the above embodiment, the operation results for one week stored in the control device can be obtained by updating the predetermined operation information (model operation information) stored in advance at the time of shipment of the device from the factory. It may be adapted to.

  Further, the working refrigerant flowing through the heat pump cycle of the heat pump unit 10 is not limited to carbon dioxide, but may be other refrigerants such as Freon.

It is a schematic diagram which shows the structure of the hot water supply apparatus which concerns on 1st Embodiment. It is a flowchart which shows the control procedure of the hot water supply apparatus which concerns on 1st Embodiment. It is a flowchart which shows the control procedure of the hot water supply apparatus which concerns on 1st Embodiment. It is a control specification figure which shows the specification of the time-dependent operation | movement / stop control of the heat pump unit 10 in the hot water supply apparatus which concerns on 1st Embodiment. It is a control specification figure which shows the specification of the operation / stop control at the time of filling of the heat pump unit 10 in the hot water supply apparatus according to the first embodiment.

Explanation of symbols

8 ... Heat pump control device (control device)
10. Heat pump unit (heat pump type heating device)
11 ... Hot water storage tank 12 ... System control device (control device)

Claims (2)

Heat pump water using a heat pump refrigeration cycle, the heat pump maximum capacity of the heat pump maximum capacity is 7 kW or more (10),
A hot water storage tank (11) having a capacity of 200L or less and storing the water heated by the heat pump heating device (10) for use as a hot water to a hot water supply use side terminal;
A control device (8, 12) for storing the operation results of the heat pump type heating device (10) in a past predetermined period and controlling the heating operation of the heat pump type heating device (10);
With
The control device (8, 12) calculates the required amount of heat filling per day from the past operation results in a predetermined period, and uses only the calculated amount of heat required for filling hot water per day in the heating operation. calculates the target boiling temperature (TP),
The control device (8, 12) obtains the amount of heat used for hot water supply from the past operation results in a predetermined period, predicts the amount of hot water use per day from the obtained amount of hot water use, and supplies the hot water per day Using the amount of heat obtained by subtracting the amount of heat boiled in the midnight time zone from the predicted value of the amount of heat used, the heating pump heating device (10) is heated in the time zone after the midnight time zone. Calculate the time,
The control devices (8, 12) store the capacity of the heat pump heating device (10) in the heating operation (10) in a plurality of time zones set in one day and the hot water storage tank (11). A hot water supply apparatus that is determined based on the amount of stored hot water. The control device (8, 12) changes the start condition and end condition of the reheating operation of the heat pump type heating device (10) according to a plurality of time zones set in one day. The hot water supply device according to claim 1 , wherein

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