JP2009068804A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve energy efficiency by reducing a heat radiation amount from a hot water storage tank in a hot water supply system wherein a heating means carries out replenishing operation of replenishing hot water to the hot water storage tank. <P>SOLUTION: The hot water supply system 10 is provided with the hot water storage tank 25, the heating means 13 for heating taken-in water and supplying it to the hot water storage tank 58, and a control means 50 for having the heating means 13 carry out the replenishing operation of replenishing hot water to the hot water storage tank 25 when a remaining hot water amount being an amount of hot water for hot water supply remaining in the hot water storage tank becomes a lower limit hot water amount. The heating means 50 carries out normal operation of setting the lower limit amount as a first reference value and controlling the replenishing operation of the heating means 13, and hot water increasing operation of setting the lower limit hot water amount as a second reference value larger than the first reference value when a predetermined switching condition is satisfied, and controlling the replenishing operation of the heating means 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus including a hot water storage tank and heating means for heating the supplied water and supplying the hot water to the hot water storage tank.

2. Description of the Related Art Conventionally, there is known a hot water supply apparatus that includes a hot water storage tank and heating means that heats the taken-in water and supplies the hot water to the hot water storage tank. This type of hot water supply apparatus is disclosed in Patent Document 1. The hot water supply apparatus of Patent Document 1 is configured to perform a full-boiling operation and a hot water exhausting operation. The total boiling operation is performed at midnight. On the other hand, the hot water chasing operation is executed when the remaining hot water amount, which is the amount of hot water remaining in the hot water storage tank, is equal to or less than the lower limit hot water amount. Whether or not the remaining hot water amount is less than or equal to the lower limit hot water amount is determined by whether or not the measured value of a predetermined temperature sensor of the hot water storage tank is lower than or equal to a predetermined temperature.
JP 2003-194405 A

  By the way, in the conventional hot water supply apparatus, even when the required amount of hot water for hot water supply increases (for example, when filling a bathtub with hot water), the value is such that there is no hot water outflow where the remaining hot water amount becomes zero. The lower limit amount of hot water was set. That is, for example, the lower limit hot water amount of the remaining hot water amount is set to a relatively large value so that the hot water amount necessary for filling the bathtub is always ensured in the hot water storage tank. For this reason, since the amount of hot water remaining in the hot water storage tank is maintained at a relatively large amount, the amount of heat released from the hot water storage tank is always increased, and the energy efficiency of the hot water supply device is lowered.

  The present invention has been made in view of such a point, and an object of the present invention is to reduce the amount of heat released from the hot water storage tank and improve the energy efficiency in the hot water supply device that performs a replenishment operation in which the heating means supplies hot water to the hot water storage tank. It is to improve.

  The first invention comprises a hot water storage tank (25) for storing hot water for hot water supply, heating means (13) for heating the supplied water and supplying it to the hot water storage tank (25), and remaining in the hot water storage tank (25). Control means (50) for causing the heating means (13) to perform a replenishment operation for supplying hot water to the hot water storage tank (25) when the amount of remaining hot water, which is the amount of hot water for hot water supply, falls below the lower limit hot water volume, The control means (50) sets the lower limit hot water amount to a first reference value and controls the replenishment operation of the heating means (13), and when a predetermined switching condition is satisfied, the lower limit hot water amount is set to the first reference value. The hot water supply device (10) performs a hot water volume increasing operation for controlling the replenishment operation of the heating means (13) by setting the second reference value larger than the value.

  In the first invention, the control means (50) performs the normal operation and the hot water volume increasing operation. In the normal operation, the lower limit hot water amount is set to the first reference value, and the replenishment operation is performed when the remaining hot water amount becomes equal to or less than the first reference value. On the other hand, in the hot water volume increasing operation, the lower limit hot water volume is set to a second reference value that is larger than the first reference value, and the replenishment operation is performed when the remaining hot water volume becomes equal to or less than the second reference value. That is, in the first aspect of the invention, it is possible to perform a normal operation and a hot water volume increasing operation with different lower limit hot water volumes.

  In a second aspect based on the first aspect, in the control means (50), the amount of heat of hot water (hereinafter referred to as hot water supply load) supplied from the hot water storage tank (25) to the user side is within one day. The switching condition is set so that the hot water volume increasing operation is performed only over a predetermined time period including the peak time assumed as the maximum time.

  In the second invention, the control means (50) performs the hot water volume increasing operation only in a predetermined time zone including the peak time (hereinafter referred to as the peak time zone). The lower limit hot water amount of the remaining hot water amount is set to the second reference value in the peak time zone, and is set to a first reference value smaller than the second reference value in the time zone other than the peak time zone.

  According to a third aspect, in the first or second aspect, the control means (50) has the switching condition that the current time becomes a reference time.

  In the third invention, the control means (50) performs the normal operation until the current time becomes the reference time. When the current time becomes the reference time, the control means (50) performs the hot water volume increasing operation.

  According to a fourth aspect of the present invention, in the first or second aspect of the invention, the control means (50) is configured such that the remaining hot water amount is initially set to the lower limit hot water amount from a state where the remaining hot water amount has reached the upper limit hot water amount during the normal operation. The switching conditions are as follows.

  In the fourth aspect of the invention, the control means (50) performs the normal operation from the state in which the remaining hot water amount reaches the upper limit hot water amount until the remaining hot water amount first falls below the first reference value. When the remaining hot water amount first becomes equal to or less than the first reference value, the control means (50) performs the hot water amount increasing operation.

  According to a fifth aspect of the present invention, in the first or second aspect of the invention, in the control means (50), an integrated value from a predetermined time of the amount of hot water supplied from the hot water storage tank (25) to the user side is used as a switching determination value. The above switching condition is reached.

  In the fifth invention, the control means (50) performs the normal operation until the integrated value from the predetermined time of the amount of hot water supplied from the hot water storage tank (25) to the user side reaches the switching determination value. When the integrated value reaches the switching determination value, the control means (50) performs a hot water volume increasing operation.

  In a sixth aspect based on the first or second aspect, in the control means (50), an integrated value from a predetermined time of the amount of hot water supplied from the hot water storage tank (25) to the user side is used as a switching determination value. The switching condition is that a predetermined time elapses from the time point when the time is reached.

  In the sixth aspect of the invention, the control means (50) performs the normal operation until a predetermined time elapses from the time when the integrated value from the predetermined time of the hot water supply amount to the user side from the hot water storage tank (25) reaches the switching determination value. Do. Then, when a predetermined time has elapsed from the time when the integrated value reaches the switching determination value, the control means (50) performs a hot water volume increasing operation.

  In a seventh aspect based on the first aspect, the switching condition is that the control means (50) inputs a switching command to the hot water amount increasing operation from a user.

  In 7th invention, a control means (50) performs normal operation | movement until the switch command to the hot water volume increase operation | movement is input from the user. When the switching command is input from the user, the control means (50) performs the hot water volume increasing operation. In the seventh aspect of the invention, the user who knows the required amount of hot water for hot water supply can switch to the hot water amount increasing operation.

  In an eighth aspect based on the third aspect, a bathtub (30) is connected to the use side of the hot water storage tank (25), and the start time or end time of hot water filling to the bathtub (30) is used. On the other hand, the control means (50) sets a time that is a predetermined time before the input start time or end time as the reference time.

  In the eighth aspect of the invention, the control means (50) switches from the normal operation to the hot water volume increasing operation at a time before a predetermined time before the hot water start time or end time input by the user. That is, switching to the hot water volume increasing operation is performed in accordance with the hot water filling start time or end time.

  According to a ninth invention, in any one of the first to seventh inventions, a bathtub (30) is connected to the use side of the hot water storage tank (25), while the control means (50) The 2nd standard value is set more than the amount of hot water supply required for hot water filling to the above-mentioned bathtub (30).

  In the ninth aspect, the second reference value, which is the lower limit amount of hot water increasing operation, is set to be equal to or greater than the amount of hot water required for filling the bath (30). In the hot water volume increasing operation, since the replenishment operation is performed when the remaining hot water volume becomes equal to or less than the second reference value, the remaining hot water volume is generally maintained at or above the hot water supply volume required for hot water filling.

  According to a tenth aspect of the present invention, in any one of the first to eighth aspects of the invention, the heating means (13) is configured so that the heating capability of water is variable, while the control means (50) The heating capacity during the increasing operation is set higher than that in the normal operation.

  In the tenth invention, the heating capacity of the heating means (13) is higher than that in the normal operation during the hot water volume increasing operation. For this reason, in the hot water quantity increasing operation, the amount of heat of hot water supplied to the hot water storage tank (25) per unit time during the replenishment operation is larger than that in the normal operation. Therefore, in the hot water volume increasing operation, the increased amount of hot water for hot water supply per unit time in the hot water storage tank (25) is larger than in the normal operation.

  In an eleventh aspect based on any one of the first to eighth aspects, the heating means (13) is configured such that the heating capability of water is variable, while the control means (50) The heating capacity during the hot water volume increasing operation is adjusted so that the heating capacity increases as the hot water volume decreases.

  In the eleventh aspect of the invention, the heating capacity during the hot water volume increasing operation is adjusted so that the heating capacity of the heating means (13) increases as the remaining hot water volume decreases. For this reason, in the replenishment operation of the hot water increase operation, the smaller the amount of remaining hot water, the larger the amount of hot water supplied to the hot water storage tank (25) per unit time. Therefore, the smaller the remaining hot water amount, the longer the unit time in the hot water storage tank (25). Increase in the amount of hot water for hot water supply per hit.

  In a twelfth aspect based on any one of the first to eleventh aspects, the control means (50) causes the remaining hot water amount to be larger than the capacity of the hot water storage tank (25) in the daytime time replenishment operation. When the predetermined value is reached, the replenishment operation is terminated.

  In the twelfth aspect, during the daytime replenishment operation, the control means (50) terminates the replenishment operation when the amount of remaining hot water reaches a predetermined value smaller than the capacity of the hot water storage tank (25). That is, in the replenishment operation during the daytime, the replenishment operation is completed before the remaining hot water reaches the capacity of the hot water storage tank (25).

  According to the present invention, it is possible to perform a normal operation and a hot water volume increasing operation with different lower limit hot water volumes. The lower limit amount of hot water increasing operation is larger than the lower limit amount of hot water for normal operation. For this reason, when the required amount of hot water for hot water supply is not so large, the lower limit hot water amount performs the normal operation with the first reference value, and when the required amount of hot water for hot water supply is large, the lower limit hot water amount increases with the second reference value. The hot water for hot water supply in the hot water storage tank (25) when the required amount of hot water for hot water supply is not so large compared to the conventional hot water supply device in which the lower limit hot water amount cannot be changed by setting the switching condition to perform The amount can be reduced. Therefore, since the amount of heat released from the hot water storage tank (25) when the required amount of hot water for hot water supply is not so large can be reduced, the energy efficiency of the hot water supply device (10) can be improved.

  According to the second aspect, the lower limit hot water amount of the remaining hot water amount is set to the second reference value in the peak time zone, and is smaller than the second reference value in the time zone other than the peak time zone. It is set to a value. Therefore, hot water shortage can be made difficult to occur during peak hours, and the amount of heat from the hot water tank (25) is reduced by reducing the amount of hot water in the hot water tank (25) during times other than the peak time. Can be made.

  In the second aspect of the invention, the replenishment operation is performed when the remaining hot water amount is lower than the second reference value at the start time of the peak time period. By this replenishment operation, the hot water storage tank (25) is ensured to some extent with the supply amount of hot water for hot water supply to the user side during peak hours.

  Here, in the conventional hot water supply device, the supply amount of hot water for hot water supply to the user side is stored in the hot water storage tank (25) by the replenishment operation in the late-night time period when the electricity rate is low. For this reason, the capacity of the hot water storage tank (25) is set on the basis of the daily supply amount to the user side, and the hot water storage tank (25) is enlarged.

  On the other hand, in this 2nd invention, it is not necessary to ensure the supply_amount | feed_rate to the utilization side of the hot water for hot water supply in a peak time zone before the peak time zone. For this reason, since the amount of hot water for hot water supply stored in the midnight time zone can be reduced, the hot water storage tank (25) can be made compact.

  In the third invention, when the current time becomes the reference time, the control means (50) performs the hot water volume increasing operation. By the way, for example, in ordinary households, the hot water supply load from evening to night when the hot water is filled in the bathtub is large, and the time zone during which the hot water supply load increases is roughly determined. Therefore, by setting the reference time in consideration of the time when the hot water supply load becomes large, the timing for switching from the normal operation to the hot water volume increasing operation can be set appropriately, and the remaining hot water amount can be appropriately set according to the hot water supply load. Can be adjusted.

  In the fourth aspect of the invention, the control means (50) performs the hot water volume increasing operation when the remaining hot water volume is initially equal to or less than the first reference value from the state where the remaining hot water volume has reached the upper limit hot water volume. By the way, in a general household, for example, the hot water supply load from morning to evening is not so large, and the amount of hot water supplied from the hot water storage tank (25) to the user side (hereinafter referred to as the amount of hot water used) does not change greatly depending on the day. Therefore, in consideration of the amount of hot water used until the evening when the hot water supply load increases, the first reference value, which is the lower limit amount of normal operation, is set to appropriately set the timing for switching from the normal operation to the hot water increase operation. The amount of remaining hot water can be adjusted appropriately according to the hot water supply load.

  In the fifth aspect of the invention, when the integrated value from the predetermined time of the amount of hot water supplied from the hot water storage tank (25) to the user side reaches the switching determination value, the control means (50) performs the hot water amount increasing operation. That is, when the amount of hot water used from a predetermined time reaches the switching determination value, the control means (50) performs an operation for increasing the amount of hot water. Therefore, considering the amount of hot water used until the evening when the hot water supply load becomes large, by setting the switching judgment value, it is possible to appropriately set the timing for switching from the normal operation to the hot water volume increasing operation. The amount of remaining hot water can be adjusted appropriately.

  In the sixth aspect of the invention, the control means (50) increases the hot water volume when a predetermined time has elapsed from the time when the integrated value from the hot water storage tank (25) to the user side reaches the switching determination value. Perform the action. That is, when a predetermined time has elapsed since the amount of hot water used from a predetermined time has reached the switching determination value, the control means (50) performs an operation for increasing the amount of hot water. Therefore, by setting the switching judgment value in consideration of the amount of hot water used up to the time when the hot water supply load becomes large, the timing for switching from the normal operation to the hot water volume increasing operation can be set appropriately, and depending on the hot water supply load The amount of remaining hot water can be adjusted appropriately.

  In the seventh aspect of the invention, since it is a switching condition that a switching command to the hot water amount increasing operation is input from the user, the user who knows the necessary amount of hot water for hot water supply increases the hot water amount. Switching to operation can be performed. For this reason, the amount of hot water for hot water supply in the hot water storage tank (25) can be accurately adjusted according to the use situation of hot water for hot water supply by the user. In addition, even when the user uses a large amount of hot water during a time period when the user does not normally use a large amount of hot water for hot water supply, the user issues a hot water outage command by switching to a hot water volume increasing operation. This can be prevented.

  In the eighth aspect of the invention, switching to the hot water volume increasing operation is performed according to the start time or end time of hot water filling. For this reason, the amount of hot water for hot water supply in the hot water storage tank (25) can be accurately adjusted in accordance with the hot water filling time in which the required amount of hot water for hot water supply is large in one day. In addition, even when the user does not normally fill the hot water, the time for switching to the hot water increase operation is determined based on the user's input. It can be prevented from occurring.

  In the ninth aspect of the invention, by setting the second reference value to be equal to or greater than the amount of hot water required for filling the bath (30), the remaining amount of hot water in the hot water increase operation is generally greater than the amount of hot water necessary for filling. To be maintained. For this reason, it is possible to prevent hot water from running out when performing hot water filling during the hot water volume increasing operation.

  In the tenth aspect of the invention, since the heating capacity of the heating means (13) during the hot water volume increasing operation is higher than that during the normal operation, the unit in the hot water storage tank (25) is used in the replenishment operation of the hot water volume increasing operation. The amount of hot water for hot water supply per hour increases as compared to normal operation. For this reason, even when the amount of hot water supplied to the use side of the hot water for hot water supply is larger than the amount of hot water supplied from the heating means (13) and the remaining hot water amount is reduced in the hot water increase operation, the remaining hot water amount is reduced. It is possible to quickly return to the second reference value.

  Further, according to the eleventh aspect of the invention, in the hot water volume increasing operation, the replenishment operation is performed such that the smaller the remaining hot water volume, the larger the increased amount of hot water for hot water supply per unit time in the hot water storage tank (25). ing. For this reason, even if the amount of remaining hot water decreases in the hot water volume increasing operation, the amount of decrease in the remaining hot water amount per unit time can be reduced as the amount of remaining hot water decreases. .

  In the twelfth aspect of the invention, in the replenishment operation during the daytime, the replenishment operation is completed before the remaining hot water amount reaches the capacity of the hot water storage tank (25). Here, the electricity bill is higher during the daytime than at night. For this reason, compared with the case where the replenishment operation is performed until the remaining hot water amount reaches the capacity of the hot water storage tank (25) during the daytime, it is possible to reduce the electricity bill per time in the daytime replenishment operation.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the hot water supply device (10) of this embodiment includes a hot water storage unit (20) and a heating unit (40). The hot water storage unit (20) and the heating unit (40) are installed outside the room and are connected by a pipe constituting a circulation channel (21) described later. Further, the hot water supply device (10) is provided with a controller (50) for controlling the operating state of the hot water supply device (10).

  The hot water storage unit (20) includes a hot water storage tank (25) formed in a vertically long and cylindrical sealed container shape. As the hot water storage tank (25), a relatively small tank (for example, a tank having a capacity in the range of 100 liters to 200 liters) is used. The hot water storage tank (25) has a water supply port (26), a hot water outlet (27), a water intake port (28), and a hot water inlet (29). The water supply port (26) and the water intake port (28) are formed at the bottom of the hot water storage tank (25). The hot water outlet (27) is formed at the top of the hot water storage tank (25). The hot water inlet (29) is formed in the upper part of the side wall of the hot water storage tank (25).

  The hot water storage tank (25) is provided with a first temperature sensor (24a), a second temperature sensor (24b), and a third temperature sensor (24c) at a predetermined pitch from above. These temperature sensors (24a, 24b, 24c) constitute a remaining amount detector for detecting the amount of remaining hot water, which is the amount of hot water for hot water supply remaining in the hot water storage unit (20). The number of temperature sensors (24) is merely exemplary. In the present specification, “hot water for hot water supply” means hot water having a predetermined temperature (for example, 80 ° C.) or more.

  An outlet end of a water supply channel (31) for supplying city water to the hot water storage tank (25) is connected to the water supply port (26) of the hot water storage tank (25). A plurality of water supply branch channels (32) branch from the water supply channel (31). Each water supply branch channel (32) is connected to the mixing valve (35). On the other hand, the inlet end of the hot water supply channel (36) is connected to the hot water outlet (27) of the hot water storage tank (25). The hot water supply channel (36) is branched into a plurality of hot water supply branch channels (37). Each hot water supply branch channel (37) is connected to the mixing valve (35). Each mixing valve (35) is connected to a water supply branch channel (32) and a hot water branch channel (37) one by one.

  Note that water pressure is constantly applied to the water supply port (26) of the hot water storage tank (25) from the water supply flow path (31), and the hot water storage tank (25) is always filled with water. In the hot water storage tank (25), the temperature is higher in the upper water.

  Three ports are formed in the mixing valve (35). The mixing valve (35) is configured to mix the water flowing into the first port and the water flowing into the second port and send the mixed water from the third port. The mixing valve (35) is configured to be able to change the flow rate ratio between the water flowing into the first port and the water flowing into the second port. In the mixing valve (35), the water supply branch flow path (32) is connected to the first port, the hot water supply branch flow path (37) is connected to the second port, and the bathtub (30) in the bathroom is connected to the third port. A use side flow path (39) extending to the use side such as a kitchen or a wash basin is connected. In addition, in FIG. 1, although the branch channel (32b, 37b), the use side channel (39b), and the mixing valve (35b) for the washstand and the kitchen are collectively shown, it is actually for the washstand. And a branch channel (32, 37), a use side channel (39) and a mixing valve (35) for the kitchen are separately provided.

  In the hot water storage tank (25), the inlet end of the circulation channel (21) is connected to the water intake (28), and the outlet end of the circulation channel (21) is connected to the hot water inlet (29). The circulation channel (21) is provided across the hot water storage unit (20) and the heating unit (40).

  The circulation channel (21) is provided with a pump mechanism (14) constituted by a so-called laminated pump between the intake port (28) and the outlet position of the hot water storage unit (20). Further, a water heat exchanger (43) to be described later is connected to the circulation channel (21). In the circulation channel (21), a water temperature sensor (22) is provided upstream of the water heat exchanger (43), and a hot water temperature sensor (23) is provided downstream of the water heat exchanger (43). Yes. The circulation channel (21) is configured such that the water sent from the hot water storage unit (20) by the pump mechanism (14) returns to the hot water storage unit (20) after passing through the heating unit (40). .

The heating unit (40) includes a refrigerant circuit (45) provided with a compressor (41), an air heat exchanger (42), a water heat exchanger (43), and an expansion valve (44). The refrigerant circuit (45) is filled with carbon dioxide (CO ₂ ) as a refrigerant. The heating unit (40) is provided with an outdoor fan (46) that sends outdoor air to the air heat exchanger (42). The refrigerant charged in the refrigerant circuit (45) may be a chlorofluorocarbon refrigerant.

  In the refrigerant circuit (45), the discharge side of the compressor (41) is connected to the water heat exchanger (43), and the suction side of the compressor (41) is connected to the air heat exchanger (42). An expansion valve (44) is disposed between the air heat exchanger (42) and the water heat exchanger (43).

  The compressor (41) has a variable operating capacity. Electric power is supplied to the compressor (41) via an inverter. The compressor (41) is configured such that its operating capacity can be adjusted in stages by changing the output frequency of the inverter. The operating capacity of the compressor (41) is configured to be adjustable in a plurality of stages (for example, 8 stages).

  The air heat exchanger (42) is a cross-fin type fin-and-tube heat exchanger. The air heat exchanger (42) exchanges heat between the refrigerant and the outdoor air. The expansion valve (44) is configured as an electric expansion valve with a variable opening.

  The water heat exchanger (43) is a so-called plate heat exchanger, and includes a plurality of first flow paths (43a) and a plurality of second flow paths (43b) that are partitioned from each other. The water heat exchanger (43) is configured to perform heat exchange between the fluid in the first channel (43a) and the fluid in the second channel (43b). The first channel (43a) is connected to the circulation channel (21). Water taken from the bottom of the hot water storage tank (25) flows into the first flow path (43a). On the other hand, the second flow path (43b) is connected to the refrigerant circuit (45) and is disposed between the compressor (41) and the expansion valve (44). The high-temperature and high-pressure refrigerant discharged from the compressor (41) flows into the second flow path (43b).

  In the water heat exchanger (43), by operating the compressor (41) and the pump mechanism (14), respectively, the refrigerant flowing through the second flow path (43b) reacts with the water flowing through the first flow path (43a). The water flowing through the first flow path (43a) is heated by the refrigerant flowing through the second flow path (43b). In this hot water supply device (10), by operating the compressor (41) and the pump mechanism (14) in this way, a replenishment operation (so-called boiling increase operation) for supplying hot water into the hot water storage tank (25) is performed. Is called. Details of the replenishment operation will be described later. In this embodiment, the heating unit (40) and the circulation channel (21) constitute heating means (13) that heats the water taken from the hot water storage tank (25) and returns it to the hot water storage tank (25). .

<Configuration of controller>
The controller (50) constitutes a control means, and includes a hot water volume control unit (51) and a heating capacity control unit (52). The hot water amount control unit (51) is configured to be able to adjust the remaining hot water amount in the hot water storage unit (20). Further, the heating capacity control unit (52) is configured to be able to adjust the heating capacity of water in the water heat exchanger (43) of the heating unit (40).

  The controller (50) receives the measured values of the temperature sensors (24a, 24b, 24c), the incoming water temperature sensor (22), and the hot water temperature sensor (23). In addition, the hot water supply device (10) is provided with an operation panel (55) provided with a hot water input portion for the user to input a hot water start command to the bathtub (30). The operation panel (55) is connected to the controller (50).

  The hot water control unit (51) is configured to determine the execution of the replenishment operation when it is detected that the remaining hot water amount in the hot water storage unit (20) is less than or equal to the lower limit hot water amount. The hot water amount control unit (51) is configured to be able to perform a normal operation and a hot water amount increasing operation with different lower limit hot water amounts.

  Specifically, in normal operation, the lower limit hot water amount is a first reference value equal to the remaining hot water amount (X liters) in a state where the measured value of the first temperature sensor (24a) reaches a predetermined reference temperature (for example, 80 ° C.). ing. The first reference value is a value less than the amount of hot water required for filling the bathtub (30). When detecting that the measured value of the first temperature sensor (24a) is lower than a predetermined reference temperature (for example, 80 ° C.), the hot water control unit (51) determines that the remaining hot water amount is lower than the first reference value. Then, the execution of the replenishment operation is determined. That is, in the normal operation, the control means (50) determines the start of the replenishment operation by setting the lower limit hot water amount to the first reference value.

  In normal operation, the upper limit hot water amount becomes the first upper limit reference value equal to the remaining hot water amount (Y liter) in a state where the measured value of the second temperature sensor (24b) reaches a predetermined reference temperature (for example, 80 ° C.). Yes. When the hot water amount control unit (51) detects that the measured value of the second temperature sensor (24b) is equal to or higher than a predetermined reference temperature (for example, 80 ° C.) during the replenishment operation, the remaining hot water amount is the first. It is determined that the upper limit reference value has been reached, and the replenishment operation is terminated.

  On the other hand, in the hot water volume increasing operation, the lower limit hot water volume becomes the second reference value equal to the remaining hot water volume (Y liter) in a state where the measured value of the second temperature sensor (24b) becomes a predetermined reference temperature (for example, 80 ° C.). Yes. The second reference value is equal to the first upper limit reference value and is larger than the first reference value. Moreover, a 2nd reference value is a value more than the amount of hot water supply required for hot water filling to a bathtub (30). When the hot water amount control unit (51) detects that the measured value of the second temperature sensor (24b) is lower than a predetermined reference temperature (for example, 80 ° C.), it determines that the remaining hot water amount is lower than the second reference value. Then, the execution of the replenishment operation is determined. That is, in the hot water volume increasing operation, the control means (50) determines the start of the replenishment operation by setting the lower limit hot water volume to the second reference value.

  Further, in the hot water volume increasing operation, the upper limit hot water volume becomes the second upper limit reference value equal to the remaining hot water volume (Z liters) in a state where the measured value of the third temperature sensor (24c) becomes a predetermined reference temperature (for example, 80 ° C.). ing. When the hot water amount control unit (51) detects that the measured value of the third temperature sensor (24c) is equal to or higher than a predetermined reference temperature (for example, 80 ° C.) during the replenishment operation, the remaining hot water amount becomes the second hot water amount. It is determined that the upper limit reference value has been reached, and the replenishment operation is terminated. In the normal operation and the hot water volume increasing operation, the measured value of the incoming water temperature sensor (22) or the measured value of the hot water temperature sensor (23) may be used to determine the end of the replenishment operation.

  In the normal operation, similarly to the hot water volume increasing operation, the hot water volume control unit (51) causes the measured value of the third temperature sensor (24c) to be equal to or higher than a predetermined reference temperature (eg, 80 ° C.) during the replenishment operation. When it is detected that it is, the replenishment operation may be terminated.

  In this embodiment, in both the normal operation and the hot water volume increasing operation, the supply operation is terminated when the remaining hot water volume reaches a predetermined value smaller than the capacity of the hot water storage tank (25). That is, the whole amount of water that fills the hot water storage tank (25) with hot water for hot water supply is not heated.

  In the hot water amount control unit (51), switching from the normal operation to the hot water amount increasing operation is performed only once a day. In the hot water control unit (51), the peak including the peak time assumed as the time when the amount of heat of hot water (hereinafter referred to as hot water supply load) supplied from the hot water storage tank (25) to the user side becomes maximum in one day. Switching from the normal operation to the hot water volume increasing operation is performed in accordance with the time zone.

  Here, FIG. 2 shows an example of a time-series change in the daily hot water supply load. In FIG. 2, the hot water supply load is at 9 pm. During the time when the hot water supply load is at a maximum, hot water filling is performed on the bathtub (30).

  In the hot water amount control section (51) of this embodiment, the time from the start to the end of hot water filling is set as the peak time of the hot water supply load, and the hot water amount increasing operation is performed from the start to the end of the peak time zone including the peak time. ing.

  Specifically, in the hot water control unit (51), the peak time is assumed to be, for example, the time from 9 pm to 9:30 pm. The hot water control unit (51) is preset with a peak time zone start time (for example, 8:00 pm) and a peak time zone end time (for example, 10:30 pm) based on this peak time. . In the case of a hot water supply load as shown in FIG. 2, the start time of the peak time zone can be set, for example, at 6:00 pm.

  The hot water volume control unit (51) is configured to switch from the normal operation to the hot water volume increasing operation at the start time of the peak time zone and to switch from the hot water volume increasing operation to the normal operation at the end time of the peak time zone. In the hot water amount control unit (51), the switching condition for switching from the normal operation to the hot water amount increasing operation is that the current time is the start time (reference time) of a preset peak time zone.

  The hot water volume control unit (51) may be configured to switch from the hot water volume increasing operation to the normal operation when a cancel command for the hot water volume increasing operation is input by the user on the operation panel (55). .

  Further, the hot water amount control unit (51) may be configured to switch from the hot water amount increasing operation to the normal operation when the hot water filling by the hot water supply device (10) is completed. In this hot water supply device (10), when the user inputs to the hot water input section of the operation panel (55), the mixing valve (35a) provided for the bathtub (30) is adjusted to adjust the hot water. Tensioning is performed.

  Further, the hot water amount control section (51) may be configured to switch from the hot water volume increasing operation to the normal operation when the operation panel (55) is powered off.

  The hot water amount control unit (51) is configured to perform a so-called full-boiling replenishment operation at midnight (for example, 4 am) when the electricity rate is low. The replenishment operation for boiling the whole amount is performed until the hot water storage tank (25) is filled with hot water for hot water supply. In the late-night time zone, the hot water amount control unit (51) performs a normal operation, but this replenishment operation is forcibly performed even if the remaining hot water amount is not below the first reference value.

  The heating capacity control unit (52) is configured to control the heating capacity by adjusting the operating capacity of the compressor (41). The heating capacity controller (52) is configured to increase the heating capacity during the hot water volume increasing operation than during the normal operation. For example, in normal operation, the heating capacity control unit (52) adjusts the output frequency of the inverter so that the operating capacity is about half of the maximum operating capacity. On the other hand, in the hot water volume increasing operation, the heating capacity control unit (52) adjusts the output frequency of the inverter to a frequency larger than that in the normal operation.

-Driving action-
The replenishment operation of the hot water supply device (10) of the present embodiment will be described.

  The replenishment operation is performed by operating the compressor (41) and the pump mechanism (14), respectively. When the compressor (41) is operated, the refrigerant circuit (45) performs a supercritical refrigeration cycle in which the refrigerant circulates and the high pressure is higher than the critical pressure of the refrigerant. In this refrigeration cycle, the refrigerant is compressed by the compressor (41), the refrigerant is cooled by the water in the first flow path (43a) by the water heat exchanger (43), and the refrigerant is depressurized by the expansion valve (44). The refrigerant is heated by the outdoor air in the air heat exchanger (42). The water heat exchanger (43) functions as a radiator, and the air heat exchanger (42) functions as an evaporator. The refrigerant circuit (45) constitutes a heat pump using outdoor air as a heat source.

  On the other hand, when the pump mechanism (14) is operated, the water in the hot water storage tank (25) circulates through the circulation channel (21). In the circulation channel (21), water at the bottom of the hot water storage tank (25) is taken from the water intake (28) and flows into the first channel (43a) of the water heat exchanger (43). In the water heat exchanger (43), the water in the first channel (43a) is heated by the refrigerant flowing in the second channel (43b). The water heated in the first flow path (43a) returns from the hot water inlet (29) to the hot water storage tank (25).

  Here, the operation of the hot water supply device (10) for one day will be described.

  The hot water control unit (51) has been operating normally from midnight. Even if the remaining hot water amount is not less than or equal to the first reference value, the hot water amount control unit (51) determines, for example, that the replenishment operation for boiling the entire amount is performed at 4 am. When the replenishment operation for heating up the entire amount is completed, the hot water storage tank (25) is filled with hot water for hot water supply.

  Thereafter, the hot water control unit (51) continues the normal operation until the start time of the peak time zone (for example, 8:00 pm). In normal operation, as shown in FIG. 3, when the hot water amount control unit (51) detects that the measured value of the first temperature sensor (24a) is equal to or lower than a predetermined reference temperature (for example, 80 ° C.), It is determined that the hot water for use has decreased to the height of the first temperature sensor (24a), and the replenishment operation is started.

  When the replenishment operation is performed, if the amount of hot water supplied to the user side is zero, the amount of remaining hot water in the hot water storage unit (20) increases and the measured value of each temperature sensor (24) increases. Then, when the hot water control unit (51) detects that the measured value of the second temperature sensor (24b) is equal to or higher than a predetermined reference temperature (for example, 80 ° C.) during the replenishment operation, as shown in FIG. Then, it is determined that hot water for hot water supply has accumulated up to the height of the second temperature sensor (24b), and the replenishment operation is terminated. In the normal operation, the measurement is performed every time the measured value of the first temperature sensor (24a) becomes equal to or lower than a predetermined reference temperature (for example, 80 ° C.).

  The hot water amount control unit (51) performs the hot water amount increasing operation by switching from the normal operation at the start time of the peak time zone (for example, 8:00 pm). In the hot water volume increasing operation, when the hot water volume control unit (51) detects that the measured value of the second temperature sensor (24b) is lower than a predetermined reference temperature (for example, 80 ° C.), as shown in FIG. It is determined that the hot water for hot water supply has decreased to the height of the second temperature sensor (24b), and the replenishment operation is started.

  When the replenishment operation is performed, if the amount of hot water supplied to the user side is zero, the amount of remaining hot water in the hot water storage unit (20) increases and the measured value of each temperature sensor (24) increases. Then, when the hot water control unit (51) detects that the measured value of the third temperature sensor (24c) is equal to or higher than a predetermined reference temperature (for example, 80 ° C.) during the replenishment operation, as shown in FIG. Then, it is determined that hot water for hot water supply has accumulated up to the height of the third temperature sensor (24c), and the replenishment operation is terminated. The hot water volume increasing operation is performed each time the measured value of the second temperature sensor (24b) is equal to or lower than a predetermined reference temperature (for example, 80 ° C.).

  If the remaining hot water amount is equal to or less than the second reference value at the start time of the peak time zone (for example, 8:00 pm), the replenishment operation is immediately performed and the remaining hot water amount is increased. A 2nd reference value is a value more than the amount of hot water supply required for hot water filling to a bathtub (30). In the hot water volume increasing operation, even if a large hot water supply load other than the hot water filling occurs before the peak time, the replenishment operation is performed so that the remaining hot water volume is maintained at or above the second reference value. For this reason, even if hot water filling to the bathtub (30) is executed during the hot water volume increasing operation, hot water does not run out.

  The hot water amount control unit (51) switches from the hot water volume increasing operation to perform a normal operation at the end time of the peak time zone (for example, 11:00 pm).

  The hot water control unit (51) may be configured to set the second reference value in a plurality of stages according to the size of the bathtub (30), the family structure, and the like. In this case, a plurality of reference temperatures are set in the hot water control unit (51). The higher the reference temperature is set, the larger the second reference value becomes.

-Effect of the embodiment-
In the present embodiment, it is possible to perform a normal operation and a hot water volume increasing operation in which the lower limit hot water volume is different from each other. The lower limit amount of hot water increasing operation is larger than the lower limit amount of hot water for normal operation. For this reason, when the required amount of hot water for hot water supply is not so large, the lower limit hot water amount performs the normal operation with the first reference value, and when the required amount of hot water for hot water supply is large, the lower limit hot water amount increases with the second reference value. The hot water for hot water supply in the hot water storage tank (25) when the required amount of hot water for hot water supply is not so large compared to the conventional hot water supply device in which the lower limit hot water amount cannot be changed by setting the switching condition to perform The amount can be reduced. Therefore, since the amount of heat released from the hot water storage tank (25) when the required amount of hot water for hot water supply is not so large can be reduced, the energy efficiency of the hot water supply device (10) can be improved.

  Further, according to the present embodiment, the lower limit hot water amount of the remaining hot water amount is set to the second reference value in the peak time zone, and is set to the first reference value smaller than the second reference value in the time zone other than the peak time zone. It is set to be set. Therefore, hot water shortage can be made difficult to occur during peak hours, and the amount of heat from the hot water tank (25) is reduced by reducing the amount of hot water in the hot water tank (25) during times other than the peak time. Can be made.

  In the present embodiment, the replenishment operation is performed when the remaining hot water amount is lower than the second reference value at the start time of the peak time period. By this replenishment operation, the hot water storage tank (25) is ensured to some extent with the supply amount of hot water for hot water supply to the user side during peak hours.

  Here, in the conventional hot water supply device, the supply amount of hot water for hot water supply to the user side is stored in the hot water storage tank (25) by the replenishment operation in the late-night time period when the electricity rate is low. For this reason, the capacity of the hot water storage tank (25) is set on the basis of the daily supply amount to the user side, and the hot water storage tank (25) is enlarged.

  On the other hand, in this embodiment, it is not necessary to ensure the supply amount to the use side of the hot water for hot water supply in the peak time zone before the peak time zone. For this reason, the amount of hot water for hot water stored during midnight hours can be reduced, so the hot water storage tank (25) can be made compact, and the hot water supply device (10) is installed in a smaller space than before. It becomes possible to do. In the present embodiment, it is sufficient that the capacity of the hot water storage tank (25) is equal to or greater than the amount of hot water supply required for hot water filling.

  Moreover, in this embodiment, the 2nd reference value is set more than the amount of hot water supply required for the hot water filling to the bathtub (30), and the amount of remaining hot water is maintained more than the amount of hot water required for the hot water filling in the hot water increase operation. To be. For this reason, it is possible to prevent hot water from running out when performing hot water filling during the hot water volume increasing operation.

-Modification 1 of embodiment-
A first modification of the embodiment will be described. In the hot water amount control unit (51) of the first modified example, when the remaining hot water amount reaches the upper limit hot water amount during the normal operation, the remaining hot water amount first becomes equal to or lower than the lower limit hot water amount. It is a condition.

  Specifically, in the hot water amount control unit (51), in the normal operation, the replenishment operation for boiling the whole amount is forcibly performed in the midnight time zone, and as shown in FIG. 5, the upper limit for determining the end of the replenishment operation. The remaining hot water amount reaches the hot water amount (in this variation, the upper limit hot water amount is equal to the capacity of the hot water storage tank (25)). Then, after the replenishment operation for boiling up the entire amount, hot water is gradually supplied from the hot water storage tank (25) to the user side, and the amount of remaining hot water decreases. As shown in FIG. 5, the hot water amount control unit (51) starts the replenishment operation when the remaining hot water amount is initially equal to or lower than the first reference value in the normal operation. In the hot water amount control unit (51), switching from the normal operation to the hot water amount increasing operation is performed at the timing when it is first detected that the remaining hot water amount is equal to or less than the first reference value. In the replenishment operation at the time of switching to the hot water amount increasing operation, the replenishment operation is continued until the remaining hot water amount becomes equal to or greater than the second upper limit reference value.

  By the way, in a general household, for example, the hot water supply load from morning to evening is not so large, and the amount of hot water used during that time does not change greatly depending on the day. For this reason, in the first modification, the first reference value that is the lower limit amount of hot water for normal operation is set in consideration of the amount of hot water used until the evening when the hot water supply load increases. Therefore, the timing for switching from the normal operation to the hot water volume increasing operation can be set appropriately, and the remaining hot water volume can be adjusted appropriately according to the hot water supply load.

-Modification 2 of embodiment-
A second modification of the embodiment will be described. In the hot water control unit (51) of the second modification, the switching condition is that the integrated value from the predetermined time of the hot water supply amount from the hot water storage tank (25) to the user side reaches the switching determination value. That is, the switching condition is that the integrated value of the hot water usage from a predetermined time reaches the switching determination value.

  When the hot water storage tank (25) is filled with warm water for hot water supply from the state where the hot water supply tank (25) is filled with hot water for hot water supply by the replenishment operation for boiling the full amount, It is determined that the amount of hot water used from the time (predetermined time) at the end of the raising replenishment operation has reached the switching determination value, and switching to the hot water amount increasing operation is performed. In the hot water control unit (51), a value obtained by subtracting the first reference value from the capacity of the hot water storage tank (25) is the switching determination value.

  Here, in the second modification, the switching determination value is set in consideration of the amount of hot water used until the evening when the hot water supply load increases. Therefore, the timing for switching from the normal operation to the hot water volume increasing operation can be set appropriately, and the remaining hot water volume can be adjusted appropriately according to the hot water supply load.

  The hot water control unit (51) switches to the hot water volume increasing operation when it detects that the integrated value from the predetermined time of the hot water supply amount to the user side from the hot water storage tank (25) has reached the switching judgment value. Or may be switched to a hot water volume increasing operation after a predetermined time has elapsed from the time of detection.

—Modification 3 of Embodiment—
A modification 3 of the embodiment will be described. In the hot water amount control unit (51) of the third modification, the switching condition is that a switching command to the hot water amount increasing operation is input from the user.

  Specifically, the operation panel (55) is provided with a switching command input unit for inputting a switching command from the normal operation to the hot water volume increasing operation. The hot water amount control unit (51) is configured to switch from the normal operation to the hot water amount increasing operation when the user inputs to the switching command input unit.

  In the hot water supply device (10) of the above embodiment, a switching command input unit is provided to switch from the normal operation to the hot water amount increasing operation by the user's input regardless of the preset peak time zone. May be possible. In this case, the hot water amount control unit (51) is configured to forcibly switch from the normal operation to the hot water amount increasing operation when the user inputs to the switching command input unit.

  In this modified example 3, since it is a switching condition that the switching command to the hot water amount increasing operation is input from the user, the user who knows the necessary amount of hot water for hot water supply can change to the hot water amount increasing operation. Switching can be performed. For this reason, the amount of hot water for hot water supply in the hot water storage tank (25) can be accurately adjusted according to the use situation of hot water for hot water supply by the user. In addition, even when the user uses a large amount of hot water during a time period when the user does not normally use a large amount of hot water for hot water supply, the user issues a hot water outage command by switching to a hot water volume increasing operation. This can be prevented.

-Modification 4 of the embodiment-
Modification 4 of the embodiment will be described. In the fourth modification, the operation panel (55) is provided with a hot water time input unit for the user to input the hot water start time to the bathtub (30). Further, the hot water control unit (51) is configured to set a time before a predetermined time (for example, one hour) before the input start time as a start time (reference time) of the peak mode. That is, in the hot water control unit (51), the switching condition is that the current time is a predetermined time before the hot water start time.

  In this modified example 4, the time from the start time of the peak mode to the start time of the hot water filling (predetermined time) so that the required hot water amount of the hot water filling can be secured in the hot water storage tank (25) by the start of the hot water filling. Is set. The time from the start time of the peak mode to the start time of the hot water filling is set based on the heating capacity of the heating unit (40).

  It should be noted that the hot water time input unit may be configured to be able to input the hot water end time. In this case, the hot water control unit (51) sets the time before the input end time for a predetermined time (for example, 1 hour) as the start time (reference time) of the peak mode.

  Further, the hot water supply device (10) of the above embodiment is also provided with a hot water filling time input unit, and the amount of hot water is increased from the normal operation based on the hot water filling time inputted by the user regardless of the preset peak time zone. The time for switching to the operation may be determined. In this case, the hot water volume control unit (51) is configured to forcibly switch from the normal operation to the hot water volume increase operation at a time that is a predetermined time before the input time to the hot water time input unit.

  In this modified example 4, the hot water amount increasing operation is switched according to the hot water filling start time or end time. For this reason, the amount of hot water for hot water supply in the hot water storage tank (25) can be accurately adjusted in accordance with the hot water filling time in which the required amount of hot water for hot water supply is large in one day. In addition, even when the user does not normally fill the hot water, the time for switching to the hot water increase operation is determined based on the user's input. It can be prevented from occurring.

<< Other Embodiments >>
You may comprise the said embodiment like the following modifications.

-First modification-
About the said embodiment, the heating capability control part (52) is comprised so that the heating capability during hot water amount increase operation may become large, so that the amount of remaining hot water is small. In this case, when the amount of remaining hot water in the hot water storage tank (25) is equal to or less than the first reference value (X liter), the heating capacity control unit (52) sets the first operating capacity to the maximum operating capacity. Adjust the inverter output frequency to the value. When the remaining hot water amount is larger than the first reference value and less than or equal to the second reference value (Y liter), the heating capacity control unit (52) sets the inverter to a second set value that is smaller than the first set value. Adjust the output frequency. When the remaining hot water amount is larger than the second reference value, the heating capacity control unit (52) adjusts the output frequency of the inverter to a third set value that is smaller than the second set value. The third set value is a frequency at which the operating capacity is about half of the maximum operating capacity.

-Second modification-
About the said embodiment, when the measured value of a 2nd temperature sensor (24b) becomes below reference temperature about a heating capacity control part (52), it heats rather than the state where the measured value of a 2nd temperature sensor (24b) exceeds reference temperature. It is configured to increase capacity. The amount of remaining hot water (Y liter) in a state where the measured value of the second temperature sensor (24b) becomes a predetermined reference temperature is a value larger by a predetermined amount than the amount of hot water required for filling the bathtub (30). When the measured value of the second temperature sensor (24b) is equal to or lower than the reference temperature, the heating capacity control unit (52) is approaching a state where the amount of remaining hot water is equal to or less than the amount of hot water required for filling the bathtub (30). Judging.

-Third modification-
About the said embodiment, the hot water control part (51) is comprised so that the whole quantity boiling which fills the hot water storage tank (25) with the hot water for hot water supply may not be performed only in the replenishment operation in the daytime.

  Here, when carbon dioxide is used as the refrigerant in the heating unit (40), the coefficient of performance (COP) in boiling water having a relatively high temperature compared to boiling water having a relatively low temperature. Decreases. For this reason, in this third modification, in the daytime period when the temperature of the water flowing from the hot water storage tank (25) into the circulation flow path (21) is relatively high, all the water is not heated up, The operation efficiency of the device (10) is increased.

  In addition, the electricity bill is higher during the daytime than at night. For this reason, compared with the case where the replenishment operation for heating up the whole amount is performed during the daytime, it is possible to reduce the electricity charge per time in the replenishment operation during the daytime.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for a hot water supply apparatus including a hot water storage tank and heating means for heating the taken-in water and supplying the hot water to the hot water storage tank.

It is a schematic block diagram of the hot water supply apparatus which concerns on this embodiment. It is a chart which shows an example of the hot water supply load in a hot water supply apparatus. It is sectional drawing of the hot water storage tank which shows the change of the amount of remaining hot water in the replenishment driving | operation of normal operation | movement in the hot water supply apparatus which concerns on this embodiment. It is sectional drawing of the hot water storage tank which shows the change of the amount of remaining hot water in the replenishment driving | operation of the hot water amount increase operation | movement in the hot water supply apparatus which concerns on this embodiment. It is sectional drawing of the hot water storage tank for demonstrating the switching conditions in the hot water supply apparatus which concerns on the modification 1 of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hot-water supply apparatus 13 Heating means 21 Circulation flow path (heating means)
25 Hot water storage tank 30 Bathtub 40 Heating unit (heating means)
50 Control means

Claims (12)

A hot water storage tank (25) for storing hot water for hot water supply,
Heating means (13) for heating the taken-in water and supplying it to the hot water storage tank (25);
Control means for causing the heating means (13) to perform a replenishment operation for supplying hot water to the hot water storage tank (25) when the remaining hot water amount, which is the amount of hot water for hot water supply remaining in the hot water storage tank (25), falls below a lower limit hot water amount. (50)
The control means (50) sets the lower limit hot water amount to the first reference value and controls the replenishment operation of the heating means (13), and when a predetermined switching condition is satisfied, the lower limit hot water amount is set to the first lower limit hot water amount. A hot water supply apparatus that performs a hot water volume increasing operation for controlling a replenishment operation of the heating means (13) by setting a second reference value that is larger than a reference value. In claim 1,
In the control means (50), only over a predetermined time period including a peak time assumed as a time when the amount of heat of hot water supplied from the hot water storage tank (25) to the user side becomes the maximum in one day. The hot water supply apparatus is characterized in that the switching condition is set so as to perform the hot water volume increasing operation. In claim 1 or 2,
In the control means (50), the switching condition is that the current time becomes the reference time. In claim 1 or 2,
The control means (50) is characterized in that the switching condition is that the amount of remaining hot water first falls below the lower limit amount of hot water from a state in which the amount of remaining hot water reaches the upper limit amount of hot water during the normal operation. Hot water supply device. In claim 1 or 2,
In the control means (50), the hot water supply is characterized in that the switching condition is that an integrated value from a predetermined time of the hot water supply amount from the hot water storage tank (25) to the user side reaches a switching determination value. apparatus. In claim 1 or 2,
In the control means (50), the switching condition is that a predetermined time elapses from the time when the integrated value from the predetermined time of the hot water supply amount from the hot water storage tank (25) to the user side reaches the switching determination value. A hot water supply device characterized by being. In claim 1,
In the control means (50), the hot water supply apparatus is characterized in that the switching condition is that a switching command to the hot water amount increasing operation is input from a user. In claim 3,
A bathtub (30) is connected to the use side of the hot water storage tank (25),
While the start time or the end time of the hot water filling to the bathtub (30) is configured to be input by the user,
The hot water supply apparatus, wherein the control means (50) sets a time before a predetermined time before the input start time or end time as the reference time. In any one of Claims 1 thru | or 7,
While the hot water tank (25) is connected to the bathtub (30),
The hot water supply apparatus characterized in that, in the control means (50), the second reference value is set to be equal to or greater than the amount of hot water required for filling the bathtub (30). In any one of Claims 1 thru | or 8,
While the heating means (13) is configured such that the water heating capacity is variable,
The hot water supply apparatus characterized in that the control means (50) makes the heating capacity during the hot water volume increasing operation higher than the heating capacity of the normal operation. In any one of Claims 1 thru | or 8,
While the heating means (13) is configured such that the water heating capacity is variable,
The hot water supply apparatus, wherein the control means (50) adjusts the heating capacity during the hot water volume increasing operation so that the heating capacity increases as the remaining hot water volume decreases. In any one of Claims 1 thru | or 11,
The control means (50) terminates the replenishment operation when the remaining hot water amount reaches a predetermined value smaller than the capacity of the hot water storage tank (25) in the replenishment operation during daytime. .

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