Hot water supply equipment

Abstract

To provide a water heater which calculates the minimum boiling hot water amount for boiling during a night time zone by using a hot water supply temperature and which can boil efficiently.SOLUTION: A water heater includes: a hot water storage tank 10; a heating device 20 for heating hot water in the hot water storage tank 10; and a control device 30. The control device 30 has a boiling operation mode 31 in which the heating device 20 heats the hot water in the hot water storage tank 10. The boiling operation mode 31 includes: a daytime time zone mode 31A for executing a boiling operation in the daytime time zone; and a night time zone mode 31B for executing a boiling operation in the night time zone. The control device 30 has minimum boiling hot water amount determination means 34B for determining the minimum boiling hot water amount for boiling in the night time zone mode 31B. In the minimum boiling hot water amount determination means 34B, the minimum boiling hot water amount is determined by the hot water supply temperature.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hot water supply apparatus having a boiling operation mode. [Background technology]

[0002] Patent Document 1 discloses a water heating apparatus that includes a hot water storage tank, a heating device that heats the hot water in the hot water storage tank, and a control device, the control device having a boiling operation mode in which the heating device heats the hot water in the hot water storage tank, and the boiling operation mode includes a daytime mode in which the heating device performs boiling operation during daytime hours using electricity generated by other equipment, and that can perform boiling operation taking into account not only the amount of hot water used but also the balance of electricity demand. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-189347 A Summary of the Invention [Problem to be solved by the invention]

[0004] According to Patent Document 1, the amount of hot water to be boiled in the nighttime mode is determined by subtracting the amount of hot water set in the daytime mode. If the amount of hot water set in the daytime mode is set to be greater than the amount of hot water actually used by the user, the amount of hot water in the daytime mode is set to be less than the amount of hot water determined based on the history of hot water usage, rather than the set amount of hot water, so that the minimum amount of hot water required at night is boiled, and it is possible to respond to some sudden amounts of hot water used by users from morning to daytime without running out of hot water. However, the minimum amount of hot water required varies depending on the water supply temperature and the outside air temperature, and if the amount of hot water boiled at night is small, hot water shortages will occur, and if the amount of hot water boiled at night is large, the amount of hot water boiled during the day will decrease, resulting in reduced efficiency.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a hot water supply device that can efficiently heat water by calculating the minimum amount of hot water to be boiled during the nighttime hours using the supply water temperature. [Means for solving the problem]

[0006] The hot water supply device of the present invention described in claim 1 includes a hot water storage tank 10, a heating device 20 for heating hot water in the hot water storage tank 10, and a control device 30. The control device 30 has a boiling operation mode 31 in which the heating device 20 heats the hot water in the hot water storage tank 10. The boiling operation mode 31 has a daytime time zone mode 31A for performing boiling operation during daytime hours and a nighttime time zone mode 31B for performing the boiling operation during nighttime hours. The control device 30 has a minimum boiling water amount determination means 34B for determining a minimum amount of hot water to be boiled in the nighttime time zone mode 31B. The minimum boiling water amount determination means 34B determines the minimum amount of hot water to be boiled depending on the supply water temperature. The control device 30 compares the total amount of hot water to be boiled during the daytime set operation time set by the operation means 40 and the minimum amount of hot water to be boiled with the total amount of hot water to be boiled in one day determined based on the usage history, and boils the minimum amount of hot water in the nighttime mode 31B if the total amount of hot water is equal to or greater than the total amount of hot water to be boiled in one day. It is characterized by: Claim 2 The hot water heater of the present invention described is The hot water supply system includes a hot water storage tank 10, a heating device 20 for heating the hot water in the hot water storage tank 10, and a control device 30. The control device 30 has a boiling operation mode 31 in which the heating device 20 heats the hot water in the hot water storage tank 10. The boiling operation mode 31 has a daytime time zone mode 31A for performing boiling operation during daytime hours and a nighttime time zone mode 31B for performing the boiling operation during nighttime hours. The control device 30 has a minimum boiling water amount determination means 34B for determining a minimum amount of hot water to be boiled in the nighttime time zone mode 31B. The minimum boiling water amount determination means 34B determines the minimum amount of hot water to be boiled based on the water supply temperature. In the control device 30, if the total amount of hot water boiled, consisting of the set amount of hot water boiled during the daytime set operating time set by the operating means 40 and the minimum amount of hot water boiled, is equal to or greater than the total amount of hot water boiled in a day, the control device 30 calculates the daytime operating time in the daytime time zone mode 31A so that the total amount of hot water boiled is the total amount of hot water boiled, and in the daytime time zone mode 31A, the daytime amount of hot water boiled is calculated during the calculated daytime operating time, and in the nighttime zone mode 31B, the minimum amount of hot water boiled is boiled, and if the total amount of hot water is less than the total amount of hot water boiled, the control device 30 calculates the nighttime operating time in the nighttime zone mode 31B so that the total amount of hot water boiled is the total amount of hot water boiled, and in the nighttime zone mode 31B, the nighttime amount of hot water boiled is calculated during the calculated nighttime operating time, and in the daytime zone mode 31A, the set amount of hot water boiled is boiled. Claim 3 The hot water supply device of the present invention described above is as follows: Or claim 2 In the hot water supply device according to the embodiment, the amount of hot water to be heated in the daytime time zone mode 31A is set to 10000 / day. The aboveIt is characterized in that the ratio is set to a predetermined ratio or more relative to the total amount of boiled water. Claim 4 The hot water supply device of the present invention described above is as follows: to any one of claims 3 In the hot water supply device according to the above, at least one of a daytime operation start time, a daytime operation end time, and a daytime operation execution time during which the daytime time zone mode 31A is executed can be set by a user. The above The operation means 40 includes: The above The daytime set operation time cannot be set to less than a preset minimum operation time. Claim 5 The hot water heater of the present invention described is Claim 2 In the hot water supply device described above, the control device 30 is set so that the daytime time zone mode 31A starts operation from a daytime operation start time set by the operating means 40, and the nighttime time zone mode 31B ends operation at a nighttime operation end time set in advance, and when the daytime operation time is calculated, the daytime operation end time in the daytime time zone mode 31A is determined, and when the nighttime operation time is calculated, the nighttime operation start time in the nighttime time zone mode 31B is determined. Claim 6 The hot water supply device of the present invention described above comprises the following components: Claim 5 In the hot water supply device described in any one of claims 1 to 5, a circulation pump 16 is provided in the boiling piping 11 extending from the hot water storage tank 10 to the heating device 20, and water supply temperature detection means 18a, 18b, 18c are provided in at least one of the lower part of the hot water storage tank 10, a water supply pipe supplying water to the lower part of the hot water storage tank 10, and the boiling piping 11 extending from the hot water storage tank 10 to the circulation pump 16, and the minimum boiling water volume determination means 34B uses the water supply temperature detected by the water supply temperature detection means 18a, 18b, 18c. Claim 7 The hot water heater of the present invention described is Claim 6 In the hot water supply device described in the above, the control device 30 controls the hot water storage tank 10 to Hot waterThe circulation pump 16 is operated during the nighttime hours when the amount of heat in the refrigerant tank is estimated to be the smallest, and the supply water temperature detection means 18a, 18b, and 18c detect the supply water temperature after the circulation pump 16 is operated. Effect of the Invention

[0007] According to the present invention, the amount of hot water required to be used in the morning is determined based on the water supply temperature, which varies with the season, so that the minimum amount of hot water to be boiled in the nighttime mode can be set to the optimum minimum amount required throughout the year, and hot water can be efficiently boiled in the daytime mode without running out of hot water. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram of a water heater according to an embodiment of the present invention; [Diagram 2] Operational diagram of the hot water supply device [Diagram 3] Control flow diagram of the hot water supply device DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the hot water supply device according to the first embodiment of the present invention, the boiling operation mode has a daytime time zone mode in which boiling operation is performed during daytime hours and a nighttime time zone mode in which boiling operation is performed during nighttime hours, and the control device has a minimum boiling hot water amount determination means for determining a minimum amount of boiling hot water to be boiled in the nighttime time zone mode, and the minimum boiling hot water amount determination means determines the minimum amount of boiling hot water based on the supply water temperature. The control device compares the total amount of hot water boiled during the daytime set operation time set by the operation means with the minimum amount of hot water boiled, and the total amount of hot water boiled in one day determined based on the usage history, and boils the minimum amount of hot water in the nighttime mode if the total amount of hot water boiled is equal to or greater than the total amount of hot water boiled in one day. According to this embodiment, the amount of hot water required to be used in the morning is determined based on the supply water temperature, which varies with the season, so that the minimum amount of hot water to be boiled in the nighttime mode can be set to the optimum minimum amount required throughout the year, and hot water can be efficiently boiled in the daytime mode without running out of hot water. In addition, if the total amount of hot water is greater than or equal to the total amount of hot water to be heated in a day, the daytime operating time in daytime mode can be made shorter than the daytime operating time setting to prevent more hot water than necessary from being heated.

[0010] The present invention Second Embodiments of the present invention The hot water supply device according to the present invention has a boiling operation mode including a daytime mode in which boiling operation is performed during daytime hours and a nighttime mode in which boiling operation is performed during nighttime hours, and the control device has a minimum boiling hot water amount determination means for determining a minimum amount of boiling hot water to be boiled in the nighttime mode, and the minimum boiling hot water amount determination means determines the minimum amount of boiling hot water based on the supply water temperature,In the control device, if the total amount of hot water boiled, consisting of the set amount of hot water boiled during the daytime set operating time set by the operating means and the minimum amount of hot water boiled, is equal to or greater than the total amount of hot water boiled for the day, the control device calculates the daytime operating time in daytime time zone mode so that the total amount of hot water boiled is the total amount of hot water boiled, and in the daytime time zone mode, the daytime amount of hot water boiled is calculated during the calculated daytime operating time, and in the nighttime zone mode, the minimum amount of hot water boiled is boiled, and if the total amount of hot water is less than the total amount of hot water boiled, the control device calculates the nighttime operating time in nighttime zone mode so that the total amount of hot water boiled is the total amount of hot water boiled, and in the nighttime zone mode, the calculated nighttime operating time is used to boil the nighttime amount of hot water, and in the daytime zone mode, the set amount of hot water boiled is boiled. According to this embodiment, By determining the amount of hot water required for use in the morning based on the supply water temperature, which varies with the season, the minimum amount of hot water to be boiled in the nighttime mode can be set to the optimal minimum amount required throughout the year, and hot water can be efficiently boiled in the daytime mode without running out of hot water. If the total amount of hot water is equal to or greater than the total amount of hot water to be heated in a day, the daytime operating time in daytime mode can be shortened to be shorter than the set daytime operating time to prevent more hot water than necessary. If the total amount of hot water is less than the total amount of hot water to be heated, the nighttime operating time can be extended to prevent insufficient heating.

[0011] The present invention Third The embodiment of the present invention is Or second In the hot water supply device according to the embodiment, the amount of hot water boiled in the daytime time zone mode is set to a predetermined ratio or more of the total amount of hot water boiled in a day. According to this embodiment, it is possible to reliably perform daytime boiling. Since there is less heat radiation during the daytime compared to the nighttime, heat retention is high and the operating noise associated with the boiling operation is not bothersome, it is effective to reliably perform daytime boiling.

[0012] The present invention Fourth The embodiment of the present invention is to third In the hot water supply device according to the embodiment, an operation means is provided that allows a user to set at least one of the daytime operation start time, daytime operation end time, or daytime operation execution time when the daytime time zone mode is executed, and the operation means does not allow the daytime set operation time to be set to less than a preset minimum operation time. According to this embodiment, by ensuring a daytime heating time that is equal to or greater than the minimum operation time, it is possible to achieve an optimal ratio between the daytime time zone mode and the nighttime time zone mode.

[0013] The present invention Fifth The embodiment of the present invention is Second In the hot water supply device according to the embodiment, the control device is set so that in the daytime time zone mode, operation starts from a daytime operation start time set by the operating means, and in the nighttime time zone mode, operation ends at a preset nighttime operation end time, and when the daytime operation time is calculated, the daytime operation end time in the daytime time zone mode is determined, and when the nighttime operation time is calculated, the nighttime operation start time in the nighttime time zone mode is determined. According to this embodiment, by setting the nighttime operation end time constant in the nighttime time zone mode, it is possible to prevent a drop in the hot water temperature in the hot water storage tank until the hot water is used, and by starting operation from the set daytime operation start time in the daytime time zone mode, it is possible to quickly fill the hot water storage tank with hot water. Hot water This allows the minimum amount of water to be boiled to be set lower.

[0014] The present invention Sixth The embodiment of the present invention is as follows: Fifth In the hot water supply device according to the embodiment, the boiling piping from the hot water storage tank to the heating device has a circulation pump, and at least one of the lower part of the hot water storage tank, the water supply pipe supplying water to the lower part of the hot water storage tank, and the boiling piping from the hot water storage tank to the circulation pump is provided with a feed water temperature detection means, and the minimum boiling hot water amount determination means uses the feed water temperature detected by the feed water temperature detection means. According to this embodiment, the feed water temperature detection means for detecting the feed water temperature can be provided in any of the lower part of the hot water storage tank, the water supply pipe supplying water to the lower part of the hot water storage tank, and the boiling piping from the hot water storage tank to the circulation pump.

[0015] The present invention Seventh The embodiment of the present invention is Sixth In the hot water supply device according to the embodiment, the control device Hot water The circulation pump is operated during the nighttime hours when the amount of heat in the hot water storage tank is estimated to be the smallest, and the feed water temperature detection means detects the feed water temperature after the circulation pump is operated. Hot waterThe supply water temperature can be detected without being affected by the Hot water By operating the circulation pump during the nighttime hours when the amount of heat in the hot water storage tank is estimated to be the smallest, the amount of heat in the hot water storage tank can be reduced even if the operation time of the circulation pump is shortened. Hot water The supply water temperature can be detected without being affected by EXAMPLES

[0016] An embodiment of the present invention will now be described with reference to the drawings. FIG. 1 is a configuration diagram of a hot water supply device according to this embodiment. The hot water supply system of this embodiment comprises a hot water storage tank 10, a heating device 20 for heating the hot water in the hot water storage tank 10, a control device 30 for controlling the heating device 20, and an operating means 40 by which a user can set the setting conditions of the control device 30.

[0017] The hot water in the hot water storage tank 10 is drawn from the bottom of the hot water storage tank 10 and passed through the boiling pipe 11 to the heating device 20, where it is heated to a high temperature and then introduced from the top of the hot water storage tank 10 and stored in the hot water storage tank 10. When the hot water tap 12 is opened, the hot water in the hot water storage tank 10 that has been heated to a high temperature is mixed with water supplied from the water supply pipe 14 by the mixing valve 13 to a predetermined temperature and is supplied from the hot water tap 12. When hot water is supplied from the hot water tap 12, any shortage in the hot water storage tank 10 is made by supplying it from a water supply pipe 14 connected to the bottom of the hot water storage tank 10, so that the hot water storage tank 10 is always filled with hot water. The boiling pipe 11 leading from the hot water storage tank 10 to the heating device 20 has a circulation pump 16. When the circulation pump 16 operates, the hot water in the hot water storage tank 10 is passed through the heating device 20 and stored in the hot water storage tank 10.

[0018] The hot water supply pipe 15 extending from the hot water storage tank 10 to the hot water tap 12 is provided with a hot water supply flow rate detection means 17 for detecting the amount of hot water supplied to the hot water tap 12 . The lower part of the hot water storage tank 10 is equipped with a water supply temperature detection means 18a, the water supply pipe 14 that supplies water to the lower part of the hot water storage tank 10 is equipped with a water supply temperature detection means 18b, and the boiling pipe 11 leading from the hot water storage tank 10 to the circulation pump 16 is equipped with a water supply temperature detection means 18c. At least one of the feed water temperature detection means 18a, the feed water temperature detection means 18b, and the feed water temperature detection means 18c can be used to detect the feed water temperature.

[0019] A heat pump device composed of a compressor, a radiator, a pressure reducer, and an evaporator is suitable for the heating device 20. When a heat pump device is used as the heating device 20, heat dissipated by the radiator is used as a heat source. By using the heating device 20 as a heat pump device, electric power can be used effectively.

[0020] The control device 30 has a boiling operation mode 31 in which the heating device 20 heats the hot water in the hot water storage tank 10. The boiling operation mode 31 has a daytime time zone mode 31A in which the boiling operation is performed during daytime hours, and a nighttime time zone mode 31B in which the boiling operation is performed during nighttime hours. The control device 30 has a timer means 32. The timer means 32 measures time, and can determine the date and time. Therefore, the daytime period and the nighttime period are determined by the timer means 32. The daytime period and the nighttime period may be set in advance, or may be changed by operation of the operation means 40. For example, the daytime period is set from 9:00 to 16:00, and the nighttime period is set from 23:00 to 6:00.

[0021] The control device 30 has a hot water usage amount storage means 33A, a water supply temperature storage means 33B, and a setting condition storage means 33C. The hot water usage storage means 33A stores the amount of hot water detected by the hot water supply flow rate detection means 17 together with the time measured by the timer means 32. The hot water usage storage means 33A stores the amount of hot water by time period for a specified period such as one day, one week, one month, and one year as a hot water usage history. The feed water temperature storage means 33B stores the feed water temperature detected by at least one of the feed water temperature detection means 18a, the feed water temperature detection means 18b, and the feed water temperature detection means 18c together with the time measured by the timer means 32. The feed water temperature storage means 33B stores the feed water temperatures by time zone for a predetermined period such as one day, one week, one month, and one year. In the control device 30, Hot water The circulation pump 16 is operated during the nighttime hours when the amount of heat in the hot water storage tank 10 is estimated to be the smallest, and the supply water temperature detection means 18a, 18b, and 18c detect the supply water temperature after the circulation pump 16 is operated. Hot water The supply water temperature can be detected without being affected by the Hot water By operating the circulation pump 16 during the nighttime hours when the amount of heat in the hot water storage tank 10 is estimated to be the smallest, the amount of heat in the hot water storage tank 10 can be reduced even if the operation time of the circulation pump 16 is shortened. Hot water The supply water temperature can be detected without being affected by

[0022] The set condition storage means 33C stores at least one of the set conditions of the daytime operation start time, the daytime operation end time, and the daytime operation execution time, for which the daytime time slot mode 31A is executed. These set conditions are set by the operation means 40. The operation means 40 restricts the setting conditions so that the daytime set operation time cannot be set to less than the preset minimum operation time. For example, if the control device 30 has preset the minimum operation time to four hours, the user can set the daytime operation execution time to four hours or more, but the user cannot set it to less than four hours. The same applies to the daytime operation start time and daytime operation end time; if the daytime operation start time is set to 9:00, the user cannot set the daytime operation execution time to a time less than four hours, for example, the daytime operation end time to 12:00. If the daytime operation start time is set to 9:00, the user can set the daytime operation end time to a time after 13:00.

[0023] The control device 30 has a total boiled water volume calculation means 34A that calculates the total volume of boiled water in a day, a minimum boiled water volume determination means 34B that determines the minimum volume of boiled water to be boiled in the nighttime time zone mode 31B, a set boiled water volume calculation means 34C that calculates the set boiled water volume for the daytime set operating hours set by the operation means 40, and a boiled water volume comparison means 34D that compares the total volume of boiled water in a day with the set boiled water volume and the minimum boiled water volume. The total amount of boiled hot water calculation means 34A calculates the total amount of boiled hot water for one day based on the hot water usage history stored in the hot water usage storage means 33A. The minimum amount of hot water to be boiled by the means 34B for determining the amount of hot water to be boiled is determined by the water supply temperature stored in the water supply temperature storage means 33B. The water supply temperature here can be the water supply temperature at the time of detection, but it may also be the minimum temperature, maximum temperature, or average temperature over the past seven days. Using the minimum temperature over a specified period of time in the past can prevent hot water from running out. The minimum amount of hot water to be boiled can also be determined by the outside air temperature and the amount of hot water used (calorie) in addition to the water supply temperature. The minimum amount of hot water to be boiled can also be determined by dividing it into a minimum amount of hot water to be boiled for summer, a minimum amount of hot water to be boiled for winter, and a minimum amount of hot water to be boiled for intermediate periods. The set amount of hot water to be heated calculation means 34C calculates the set amount of hot water to be heated based on the set daytime operation time stored in the set condition storage means 33C. The boiled water volume comparison means 34D uses the total boiled water volume for the day calculated by the total boiled water volume calculation means 34A, the minimum boiled water volume determined by the minimum boiled water volume determination means 34B, and the set boiled water volume calculated by the set boiled water volume calculation means 34C.

[0024] In the hot water volume comparison means 34D, if the total volume of the set hot water volume and the minimum hot water volume is equal to or greater than the total hot water volume for the day, the daytime operation time calculation means 35A calculates the daytime operation time in the daytime time zone mode 31A so that the total volume is the total hot water volume. In the daytime operation time calculation means 35A, if the total amount of hot water is equal to or greater than the total amount of hot water to be boiled in a day, the daytime operation time in the daytime time zone mode 31A is set shorter than the daytime operation time setting, thereby preventing more hot water than necessary from being boiled. In the control device 30, the daytime time zone mode 31A is set to start operation from the daytime operation start time set by the operation means 40, and when the daytime operation time calculation means 35A calculates the daytime operation time, the daytime operation end time determination means 35B determines the daytime operation end time in the daytime time zone mode 31A.

[0025] In the boiling water volume comparison means 34D, if the total volume of the set boiling water volume and the minimum boiling water volume is less than the total boiling water volume, the night operation time calculation means 36A calculates the night operation time in the night time zone mode 31B so that the total volume of hot water becomes the total boiling water volume. In the nighttime operation time calculation means 36A, if the total amount of hot water is less than the total amount of hot water to be boiled, the nighttime operation time in the nighttime time zone mode 31B is lengthened to eliminate the insufficient boiling. In the control device 30, the night time zone mode 31B is set to end operation at a preset night operation end time, and when the night operation time calculation means 36A calculates the night operation time, the night operation start time determination means 36B determines the night operation start time in the night time zone mode 31B. In this way, in the nighttime period mode 31B, by setting the nighttime operation end time to a fixed time, it is possible to prevent the hot water temperature in the hot water storage tank 10 from decreasing until the hot water is used. In the daytime period mode 31A, by starting operation from the set daytime operation start time, it is possible to quickly fill the hot water storage tank 10. Hot water This allows the minimum amount of water to be boiled to be set lower.

[0026] FIG. 2 is an explanatory diagram of the operation of the hot water supply device according to this embodiment. In this embodiment, the control device 30 sets the daytime period from 9:00 to 16:00 and the nighttime period from 23:00 to 6:00, and sets the minimum operation time in the daytime period to 4 hours.

[0027] Fig. 2(a) shows an example of hot water usage. For example, as shown in Fig. 2(a), hot water is used from 18:00 to 22:00, 7:00, and 12:00. FIG. 2( b ) shows the state of hot water in the hot water storage tank 10 . 2(c) and 2(d) show the operation time periods of the heating device 20. At 11:00 p.m., which is the start time of the nighttime period set by the control device 30, the circulation pump 16 is operated and the water supply temperature is detected. The minimum water supply amount determination means 34B then determines the minimum water supply amount based on the detected water supply temperature. Note that it is preferable to use the water supply temperature detected during a certain period of time in the past as the water supply temperature. In this manner, in this embodiment, the amount of hot water required to be used from 6:00 to 9:00 is determined based on the water supply temperature, which varies with the season. This makes it possible to set the minimum amount of hot water to be boiled in nighttime mode 31B to the optimal minimum amount required throughout the year, and to efficiently boil hot water in daytime mode 31A without running out of hot water.

[0028] Furthermore, at 11pm, which is the start time of the nighttime period, the control device 30 calculates the total amount of boiled hot water for the day using the total amount of boiled hot water calculation means 34A. Operation state A shown in FIG. 2(c) shows a case where the total amount of hot water boiled up including the set amount of hot water boiled up during the daytime operation hours and the minimum amount of hot water boiled up is equal to or greater than the total amount of hot water boiled up in one day. An operating state A is a case where the user sets the daytime operating hours from 9:00 to 16:00. If the total amount of hot water boiled, including the set amount of hot water boiled during the daytime set operating time and the minimum amount of hot water boiled, is equal to or greater than the total amount of hot water boiled for the day, the control device 30 calculates the daytime operating time in daytime time zone mode 31A so that the total amount of hot water boiled is the total amount of hot water boiled, and determines the end time of daytime operation in daytime time zone mode 31A. In Fig. 2(c), the calculated daytime operation time is 4 hours. Since the daytime operation start time is 9:00, the daytime operation end time is determined to be 13:00. In the nighttime mode 31B, the determined minimum amount of hot water is boiled. Since the control device 30 is set to end operation at 6:00, which is the preset nighttime operation end time, the nighttime operation start time is determined by the determined minimum amount of hot water. As a result, as shown in operating state A in Figure 2 (c), during the nighttime hours, boiling operation is performed in nighttime time zone mode 31B so as to end at 6:00, and during the daytime hours, boiling operation is performed in daytime time zone mode 31A from 9:00 to 13:00.

[0029] Operation state B shown in FIG. 2(d) shows a case where the total amount of hot water boiled including the set amount of hot water boiled during the daytime operation hours and the minimum amount of hot water boiled is less than the total amount of hot water boiled in one day. An operating state B is a case where the user sets the daytime operating hours from 12:00 to 16:00. If the total amount of hot water boiled during the daytime set operating time and the minimum amount of hot water boiled is less than the total amount of hot water boiled for the day, the control device 30 calculates the nighttime operating time in the nighttime mode 31B so that the total amount of hot water boiled becomes the total amount of hot water boiled. In the nighttime time zone mode 31B, water is boiled for the calculated nighttime operation time. Since the control device 30 is set to end operation at 6:00, which is the preset nighttime operation end time, the nighttime operation start time is determined by the calculated nighttime operation time. In the nighttime time zone mode 31B, the amount of hot water to be boiled at night is boiled during the calculated nighttime operation time, and in the daytime time zone mode 31A, the set amount of hot water to be boiled is boiled. As a result, as shown in operating state B in Figure 2 (d), during the nighttime hours, boiling operation is performed in nighttime time zone mode 31B so as to end at 6:00, and during the daytime hours, boiling operation is performed in daytime time zone mode 31A from 12:00 to 16:00.

[0030] FIG. 3 is a control flow diagram of the hot water supply device according to this embodiment. The control device 30 calculates the total amount of hot water to be boiled in one day using the hot water usage history data (S1), and determines the minimum amount of hot water to be boiled in the nighttime mode 31B using the water supply temperature data (S2). Furthermore, the control device 30 calculates the set amount of hot water to be heated for the set operation time based on the set operation time in the daytime time zone mode 31A (S3). Then, the control device 30 compares the total amount of hot water to be boiled for one day calculated in S1 with the minimum amount of hot water to be boiled determined in S2 and the set amount of hot water to be boiled calculated in S3 (S4). If the total amount of hot water is equal to or greater than the total amount of hot water boiled for the day (Yes in S4), the daytime operation time in daytime time zone mode 31A is calculated so that the total amount of hot water is the total amount of hot water boiled (S5), and the daytime operation end time in daytime time zone mode 31A is determined (S6). If the total amount of hot water is less than the total amount of hot water boiled in one day (No in S4), the night operation time in night time mode 31B is calculated so that the total amount of hot water becomes the total amount of hot water boiled (S7).

[0031] When the daytime operation end time in the daytime time zone mode 31A is determined in S6 and the nighttime operation time in the nighttime time zone mode 31B is calculated in S7, the nighttime operation start time in the nighttime time zone mode 31B is determined (S8). In S8, when the daytime operation end time in daytime time zone mode 31A is determined in S6, the nighttime operation start time is determined using the minimum amount of water to be heated determined in S2, and when the nighttime operation time in nighttime time zone mode 31B is calculated in S7, the nighttime operation start time is determined using this nighttime operation time. Then, at the night-time operation start time determined in S8, the control device 30 starts the operation of the heating device 20, and performs boiling in the night-time mode 31B until the preset night-time operation end time arrives (S9). In addition, when the daytime operation start time set by the operating means 40 arrives, the control device 30 starts operation of the heating device 20 and performs boiling in the daytime time zone mode 31A until the daytime operation end time determined by S6 or the daytime operation end time set by the operating means 40 arrives (S10).

[0032] Here, the daytime hot water volume to be heated in the daytime time zone mode 31A in S10 is set to a predetermined ratio or more of the total hot water volume to be heated in one day determined in S1. The predetermined ratio is preferably 50% or more, and by setting the predetermined ratio to 50% or more, daytime heating can be ensured. Since less heat is released during the daytime compared to the nighttime, heat retention is high and the operating noise associated with the heating operation is not noticeable, it is effective to ensure daytime heating. Furthermore, when a heat pump device is used as the heating device 20, heating can be performed efficiently during the daytime compared to the nighttime because the outside air temperature is higher. Furthermore, in order to ensure that the daytime volume of hot water boiled in daytime time zone mode 31A is at least a predetermined ratio to the total volume of hot water boiled in one day determined in S1, it is preferable that the operating means 40 restricts the daytime set operating time so that it cannot be set to less than a preset minimum operating time. By ensuring a daytime boiling time that is at least the minimum operating time, it is possible to achieve an optimal ratio between the operations of daytime time zone mode 31A and nighttime time zone mode 31B. [Industrial Applicability]

[0033] According to the present invention, operation in the nighttime mode can be kept to a minimum, and efficient operation in the daytime mode can be effectively performed. [Explanation of symbols]

[0034] 10 Hot water tank 11 Boiling piping 12 Hot water tap 13 Mixing valve 14 Water supply piping 15 Hot water piping 16 Circulation pump 17 Hot water flow rate detection means 18a, 18b, 18c Supply water temperature detection means 20 Heating device 30 Control device 31 Boiling operation mode 31A Daytime mode 31B Nighttime mode 32 Timer means 33A Storage means for amount of hot water used 33B Supply water temperature storage means 33C Setting condition storage means 34A Total boiling water volume calculation method 34B Means for determining minimum amount of boiled water 34C Set boiling water volume calculation method 34D Means for comparing boiling water volume 35A Daytime operation time calculation method 35B Means for determining daytime operation end time 36A Nighttime driving time calculation means 36B Means for determining nighttime operation start time 40 Operating means

Claims

1. The hot water supply system includes a hot water storage tank, a heating device for heating the hot water in the hot water storage tank, and a control device. The control device has a boiling operation mode in which the heating device heats the hot water in the hot water storage tank, The boiling operation mode is A daytime mode in which heating operation is performed during daytime hours; a nighttime mode in which the heating operation is performed during the nighttime; having The control device includes: A minimum boiling water amount determination means is provided for determining a minimum boiling water amount to be boiled in the nighttime mode, The minimum amount of hot water to be boiled is determined by the supply water temperature in the minimum amount of hot water to be boiled. In the control device, A total amount of hot water is compared between the set amount of hot water to be heated during the daytime set operation time set by the operating means and the minimum amount of hot water to be heated, and a total amount of hot water to be heated in one day determined based on the usage history; If the total amount of hot water is equal to or greater than the total amount of hot water to be boiled in a day, the minimum amount of hot water to be boiled is boiled in the nighttime mode. A water heating apparatus characterized by the above.

2. A hot water supply system comprising a hot water storage tank, a heating device for heating hot water in the hot water storage tank, and a control device, The control device has a boiling operation mode in which the heating device heats the hot water in the hot water storage tank, The boiling operation mode is A daytime mode in which heating operation is performed during daytime hours; a nighttime mode in which the heating operation is performed during the nighttime; having The control device includes: A minimum boiling water amount determination means is provided for determining a minimum boiling water amount to be boiled in the nighttime mode, The minimum amount of hot water to be boiled is determined by the supply water temperature in the minimum amount of hot water to be boiled. In the control device, If the total amount of hot water boiled, including the set amount of hot water boiled during the daytime set operating time set by the operating means and the minimum amount of hot water boiled, is equal to or greater than the total amount of hot water boiled in a day, the daytime operating time in the daytime time zone mode is calculated so that the total amount of hot water boiled is the total amount of hot water boiled, the daytime operating time calculated in the daytime time zone mode is used to boil the amount of hot water boiled, and the minimum amount of hot water boiled is used in the nighttime zone mode. If the total amount of hot water is less than the total amount of hot water to be boiled, a nighttime operation time in the nighttime period mode is calculated so that the total amount of hot water becomes the total amount of hot water to be boiled, and the nighttime operation time calculated in the nighttime period mode is used to boil the amount of hot water to be boiled at the nighttime operation time, and the set amount of hot water to be boiled is boiled in the daytime period mode. A water heating apparatus characterized by the above.

3. The amount of hot water boiled during the daytime period mode is set to a predetermined ratio or more to the total amount of hot water boiled in a day.

3. The hot water supply device according to claim 1 or 2.

4. The operation means is provided for allowing a user to set at least one of a daytime operation start time, a daytime operation end time, and a daytime operation execution time during which the daytime time zone mode is executed, The operation means does not allow the daytime set operation time to be set to less than a preset minimum operation time. The hot water supply device according to any one of claims 1 to 3.

5. In the control device, The daytime time zone mode is set to start operation at a daytime operation start time set by the operation means, and the nighttime time zone mode is set to end operation at a nighttime operation end time set in advance, When the daytime driving time is calculated, a daytime driving end time in the daytime time zone mode is determined; When the night driving time is calculated, a night driving start time in the night time zone mode is determined.

3. The water heater according to claim 2.

6. A circulation pump is provided in the boiling pipe extending from the hot water storage tank to the heating device, A water supply temperature detection means is provided in at least one of a lower portion of the hot water storage tank, a water supply pipe that supplies water to the lower portion of the hot water storage tank, and the boiling pipe that runs from the hot water storage tank to the circulation pump; The minimum water volume determination means uses the water supply temperature detected by the water supply temperature detection means. The hot water supply device according to any one of claims 1 to 5.

7. In the control device, Operate the circulation pump during the nighttime hours when the heat quantity of the hot water in the hot water storage tank is estimated to be minimum; The supply water temperature is detected by the supply water temperature detection means after the circulation pump is operated.

7. The water heater according to claim 6.

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