hot water supply equipment

Abstract

To provide a water heater capable of securely ensuring a daytime boiling-up time that is a minimum operating time or longer and easily setting a time zone exhibiting a high daytime boiling-up effect.SOLUTION: In a water heater, a control device 30 has a boiling-up operation mode 31 in which a heater 20 heats hot water in a hot water storage tank 10, and the boiling-up operation mode 31 includes: a daytime time zone mode 31A of executing the boiling-up operation in a daytime time zone; and a night time zone mode 31B of executing the boiling-up operation in a night time zone. A time setting screen 42 is displayed in operating means 40. When a user sets a daytime operation start time and a daytime operation finish time by using the operating means 40, a recommended daytime operation time zone is displayed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a water heater 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, and 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 includes a daytime mode in which the heating device performs boiling operation during daytime hours by utilizing electricity generated by other equipment, and can perform boiling operation taking into account not only the amount of hot water used but also the balance of electricity demand. Patent document 2 also discloses a hot water storage type water heater that can be switched between a first mode in which the required heat is stored in the hot water storage tank by nighttime heating operation, which is heating operation during the nighttime hours, and a second mode in which the required heat is stored in the hot water storage tank by both daytime heating operation and nighttime heating operation, which are heating operation during the daytime hours, or by daytime heating operation only. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-189347 [Patent Document 2] Japanese Patent Application Publication No. 2019-95099 Summary of the Invention [Problem to be solved by the invention]

[0004] As in Patent Documents 1 and 2, there are an increasing number of cases in which boiling operation is performed during daytime hours, and it is desirable to ensure that the daytime boiling time is longer than the minimum operating time.

[0005] An object of the present invention is to provide a hot water supply device that reliably ensures a daytime heating time that is equal to or longer than the minimum operating time and makes it easy to set a time period during which daytime heating is most effective. [Means for solving the problem]

[0006] The hot water supply device of the present invention as set forth in claim 1 comprises a hot water storage tank 10, a heating device 20 that heats hot water in the hot water storage tank 10, a control device 30, and an operating means 40, the control device 30 having 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 having a daytime time period mode 31A in which boiling operation is performed during daytime hours and a nighttime time period mode 31B in which boiling operation is performed during nighttime hours, the operating means 40 having a time setting screen 42 displayed, and when a user sets a daytime operation start time and a daytime operation end time using the operating means 40, a recommended daytime operation time period is displayed. The control device 30 pre-stores a daytime operation start time that can be set as the operation start time for the daytime time period, a daytime operation end time that can be set as the operation end time for the daytime time period, a minimum daytime operation time during which the water heating operation must be performed in the daytime time period, and a recommended daytime operation time period that is set after the daytime operation start time and before the daytime operation end time and is shorter than the maximum daytime operation settable time, as a time period during which the water heating operation is preferably performed in the daytime time period. The operation means 40 cannot set the daytime operation start time or the daytime operation end time before the daytime operation start time or after the daytime operation end time, and can set the recommended daytime operation time period after the daytime operation start time even if it is not within the recommended daytime operation time period. The daytime driving start time and the daytime driving end time can be set if they are before the daytime driving end settable time, and when the user sets the daytime driving start time and the daytime driving end time using the operation means 40, the recommended daytime driving start time and the recommended daytime driving end time according to the recommended daytime driving time slot are displayed, and the user can change the displayed recommended daytime driving start time and the recommended daytime driving end time to input the daytime driving start time and the daytime driving end time, and an input driving time is calculated from the input daytime driving start time and daytime driving end time, and it is determined whether the calculated input driving time is equal to or greater than the minimum daytime driving time, and if the input driving time is equal to or greater than the minimum daytime driving time, setting is completed, and if the input driving time is less than the minimum daytime driving time, the user is prompted to re-input It is characterized by: Claim 2 The hot water heater of the present invention described Claim 1 In the hot water supply device described in the above, a plurality of power schemes, each having a different minimum daytime operation time and a different recommended daytime operation time slot, are stored in advance, and the user can select one of the plurality of power schemes using the operation means 40. Claim 3 The present invention as described above is characterized in that claim 1 or claim 2 In the water heating device described above, by performing the boiling operation during the minimum daytime operating time, the amount of hot water boiled during the daytime in the daytime time mode 31A is set to a predetermined ratio or more of the total amount of hot water boiled in a day. [Effects of the Invention]

[0007] According to the present invention, the recommended daytime operation start time and the recommended daytime operation end time are displayed, which leads to the setting of the recommended daytime operation time period. The input operation time is calculated from the input daytime operation start time and daytime operation end time, and the setting is completed if the calculated input operation time is equal to or greater than the minimum daytime operation time, thereby ensuring that the daytime heating time is secured. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a block diagram of a water heater according to an embodiment of the present invention; [Figure 2] Operational diagram of the hot water supply device [Figure 3] Control flow diagram of the hot water supply device [Figure 4] FIG. 10 is a flow chart showing the procedure for setting the daytime operation time in the hot water supply device. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the hot water supply device according to the first embodiment of the present invention, the control device has a heating operation mode in which the heating device heats hot water in the hot water storage tank, and the heating operation mode has a daytime time zone mode in which the heating operation is performed in daytime time zones and a nighttime time zone mode in which the heating operation is performed in nighttime time zones, and the operation means displays a time setting screen, and when the user sets the daytime operation start time and the daytime operation end time using the operation means, the recommended daytime operation time zone is displayed. The control device pre-stores a daytime operation start time that can be set as the operation start time for a daytime period, a daytime operation end time that can be set as the operation end time for a daytime period, a minimum daytime operation time during which water heating operation must be performed in a daytime period, and a recommended daytime operation time period that is set after the daytime operation start time and before the daytime operation end time and is shorter than the maximum daytime operation settable time as a time period during which water heating operation is preferably performed in a daytime period, and the operation means cannot set the daytime operation start time or the daytime operation end time before the daytime operation start time or after the daytime operation end time, and the operation means can set the daytime operation start time or the daytime operation end time after the daytime operation start time even if it is not within the recommended daytime operation time period. If the daytime driving start time and daytime driving end time are before the daytime driving end settable time, the daytime driving start time and daytime driving end time can be set, and when the user sets the daytime driving start time and daytime driving end time using the operation means, the recommended daytime driving start time and recommended daytime driving end time according to the recommended daytime driving time slot are displayed, and the user can change the displayed recommended daytime driving start time and recommended daytime driving end time to input the daytime driving start time and daytime driving end time, and the input driving time is calculated from the input daytime driving start time and daytime driving end time, and it is determined whether the calculated input driving time is equal to or greater than the minimum daytime driving time, and if the input driving time is equal to or greater than the minimum daytime driving time, the setting is completed, and if the input driving time is less than the minimum daytime driving time, the user is prompted to re-input the time. According to this embodiment, when the user sets the daytime operation start time and daytime operation end time, the recommended daytime operation time zone is displayed first, thereby ensuring that the daytime heating operation is performed. In addition, the input operation time is calculated from the input daytime operation start time and daytime operation end time, and the setting is completed if the calculated input operation time is equal to or greater than the minimum daytime operation time, thereby ensuring the daytime heating time.

[0010] The present invention No. 2 The embodiment of the present invention is No. 1In the hot water supply device according to this embodiment, a plurality of power schemes, each with a different minimum daytime operation time and recommended daytime operation time slot, are stored in advance, and the user can select one of the plurality of power schemes using the operation means. This embodiment makes it easier to select the optimal conditions.

[0011] The present invention Third The first embodiment of the present invention is or second In the hot water supply device according to the embodiment, by performing the boiling operation during the minimum daytime operation time, 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. During the daytime, less heat is released than at night, so heat retention is high, and higher temperatures mean more heat is pumped, so it is effective to reliably perform daytime boiling. [Example]

[0012] An embodiment of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of a water heater according to this embodiment. The hot water supply device of this embodiment comprises a hot water storage tank 10, a heating device 20 that heats the hot water in the hot water storage tank 10, a control device 30 that controls the heating device 20, and an operating means 40 that allows the user to set the setting conditions of the control device 30.

[0013] 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 before being 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 of hot water in the hot water storage tank 10 is made up by a water supply pipe 14 connected to the bottom of the hot water storage tank 10, and 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, and 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. The boiling pipe 11 guides the hot water at the bottom of the hot water storage tank 10 to the heating device 20, and then guides the hot water heated by the heating device 20 to the top of the hot water storage tank 10. In this way, by drawing out the hot water at the bottom of the hot water storage tank 10 and directing the heated hot water to the top of the hot water storage tank 10, a mixed layer is formed between the high temperature layer and the low temperature layer inside the hot water storage tank 10.

[0014] 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 . A residual hot water temperature detection means 18a is provided in the middle lower part of the hot water storage tank 10, a supply water temperature detection means 18b is provided in the water supply pipe 14 that supplies water to the lower part of the hot water storage tank 10 or in the lower part of the hot water storage tank 10, an inlet water temperature detection means 18c is provided in the boiling pipe 11 from the hot water storage tank 10 to the circulation pump 16, and a boiling temperature detection means 18d is provided in the boiling pipe 11 from the heating device 20 to the top of the hot water storage tank 10. The remaining hot water temperature detection means 18a detects the temperature of the remaining hot water according to the amount of hot water used, and is disposed at the position of the mixed layer formed when the amount of hot water used is stored.

[0015] 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 radiated by the radiator is used as a heat source. By using a heat pump device as the heating device 20, electric power can be used effectively.

[0016] The control device 30 has a water heating operation mode 31 in which the heating device 20 heats the hot water in the hot water storage tank 10. The water heating operation mode 31 has a daytime mode 31A in which the water heating operation is performed during daytime hours, and a nighttime mode 31B in which the water heating 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 operating the operating 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.

[0017] 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 predetermined period such as one day, one week, one month, or one year as a hot water usage history. The water supply temperature storage means 33B stores the water supply temperature detected by the water supply temperature detection means 18b together with the time measured by the timer means 32. The water supply temperature storage means 33B stores the water supply temperature by time zone for a predetermined period such as one day, one week, one month, or one year. Furthermore, by operating the circulation pump 16 during the nighttime hours when the heat content of the hot water in the hot water storage tank 10 is estimated to be the smallest by the control device 30, and after operating the circulation pump 16, detecting the temperature of the hot water using the remaining hot water temperature detection means 18a, the supply water temperature detection means 18b, and the inlet water temperature detection means 18c, the supply water temperature can be detected without being affected by the hot water in the hot water storage tank 10.Furthermore, by operating the circulation pump 16 during the nighttime hours when the heat content of the hot water in the hot water storage tank 10 is estimated to be the smallest, the supply water temperature can be detected without being affected by the hot water in the hot water storage tank 10 even if the operating time of the circulation pump 16 is shortened.

[0018] The set condition storage means 33C stores the daytime operation start time and daytime operation end time when the daytime time slot mode 31A is executed. These set conditions are set by the operation means 40.

[0019] The control device 30 has a total boiled water volume calculation means 34A that calculates the total amount of boiled water in a day, a minimum boiled water volume determination means 34B that determines the minimum amount of boiled water to be boiled in the nighttime 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 amount of boiled water in a day with the set amount of boiled water and the minimum amount of boiled water. The total amount of hot water to be boiled calculation means 34A calculates the total amount of hot water to be boiled in one day based on the history of the amount of hot water used stored in the hot water use amount storage means 33A. The minimum amount of hot water to be heated by the minimum hot water amount determination means 34B determines the minimum amount of hot water to be heated based on 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 can also be the minimum temperature, maximum temperature, or average temperature over the past seven days. Using the minimum temperature over a predetermined period of time in the past can prevent hot water from running out. The minimum amount of hot water to be heated can also be determined based on the outside air temperature and the amount of hot water used (heat quantity) 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 boiled calculation means 34C calculates the set amount of hot water to be boiled 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.

[0020] In the hot water volume comparison means 34D, if the total hot water 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 hot water volume becomes the total hot water volume. The daytime operating time comparison means 35B compares the daytime operating time calculated in the daytime time zone mode 31A with the set daytime operating time stored in the set condition storage means 33C. If the daytime operation time comparison means 35B determines that the daytime set operation time is shorter than the daytime operation time, the daytime operation end time determination means 35C determines the daytime operation end time stored in the set condition storage means 33C as the operation end time, and in the daytime time zone mode 31A, heating operation is performed for the daytime set operation time. If the daytime operation time comparison means 35B determines that the daytime set operation time is longer than the daytime operation time, the daytime time zone mode 31A starts the heating operation at the time set by the operation means 40, and the daytime operation end determination means 35D ends the daytime heating operation.

[0021] The daytime operation end determination means 35D determines that the boiling operation has ended when the temperature detected by the remaining hot water temperature detection means 18a or the inlet water temperature detection means 18c reaches the set temperature. Note that it is preferable to determine the end of operation when the temperature detected by the remaining hot water temperature detection means 18a reaches the set remaining hot water temperature and the temperature detected by the inlet water temperature detection means 18c reaches the set inlet water temperature. Furthermore, as will be described later, it is preferable to set the boiling level based on the total amount of water to be boiled, and change the set temperature according to the boiling level. Furthermore, it is preferable that the control device 30 controls the heating device 20 so that the boiling temperature detected by the boiling temperature detection means 18d becomes the boiling set temperature, and changes the boiling set temperature according to the boiling level. Furthermore, 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 operating time in daytime time zone mode 31A can be made shorter than the set daytime operating time to prevent boiling more than necessary.

[0022] In the boiling water volume comparison means 34D, if the total volume of boiling water between 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 boiling water becomes the total boiling water volume. If the total amount of hot water is less than the total amount of hot water to be boiled, the nighttime operation time calculation means 36A can eliminate the insufficient boiling by lengthening the nighttime operation time in the nighttime time zone mode 31B. 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 time zone mode 31B, by setting the nighttime operation end time to a fixed time, it is possible to prevent the temperature of the hot water in the hot water storage tank 10 from dropping until the hot water is used, and in the daytime time zone mode 31A, by starting operation from the set daytime operation start time, it is possible to replenish the hot water storage tank 10 with hot water early, so the minimum amount of hot water to be boiled can be set low.

[0023] 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 to 9:00 to 16:00 and the nighttime period to 23:00 to 6:00, and sets the minimum daytime operation time in the daytime period to, for example, 4 hours. Note that the minimum daytime operation time is not limited to 4 hours.

[0024] 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 operating time periods of the heating device 20. At 11:00 PM, 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 volume determination means 34B then determines the minimum water supply volume based on the detected water supply temperature. Note that it is preferable to use the water supply temperature detected over a certain period of time in the past as the water supply temperature. In this way, 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 depending on the season, so that the minimum amount of hot water to be boiled in the nighttime mode 31B can be set to the optimal minimum amount required throughout the year, and hot water can be boiled efficiently in the daytime mode 31A without running out of hot water.

[0025] Furthermore, at 11:00 PM, which is the start time of the nighttime period, the control device 30 calculates the total amount of hot water to be boiled for the day using the total amount of hot water to be boiled calculation means 34A. Operating state A shown in FIG. 2(c) shows a case where the total amount of hot water, including the set amount of hot water to be heated during the set daytime operating hours and the minimum amount of hot water to be heated, is equal to or exceeds the total amount of hot water to be heated in one day. Operating state A is a case where the user has set the daytime operating hours from 9:00 to 16:00. If the total amount of hot water, including the set amount of hot water to be boiled during the daytime set operating time and the minimum amount of hot water to be boiled, is equal to or greater than the total amount of hot water to be boiled in a day, the control device 30 calculates the daytime operating time in the daytime time mode 31A so that the total amount of hot water becomes the total amount of hot water to be boiled. Figure 2(c) shows a case where the calculated daytime operation time is 4 hours. Since the daytime operation start time is 9:00, if heating operation is performed during daytime operation time, the scheduled end time of daytime operation is 13:00.

[0026] In this embodiment, as shown in Figure 2(c), when the daytime set operation time is longer than the daytime operation time, the end time of the boiling operation is not set to 13:00, but the boiling operation is ended when the detected temperature detected by the remaining hot water temperature detection means 18a reaches the set remaining hot water temperature and the detected temperature detected by the inlet water temperature detection means 18c reaches the set inlet water temperature, thereby ending the boiling operation at, for example, 12:40. In 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 end time of nighttime operation, 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, heating operation is performed using nighttime time mode 31B to end at 6:00, and during the daytime hours, heating operation is performed using daytime time mode 31A from 9:00 to 13:00.

[0027] 2(d) shows a case where the sum of the set hot water volume for the daytime set operating time and the minimum hot water volume for the daytime set operating time is less than the total hot water volume for the day. In other words, when the daytime set operating time is shorter than the daytime operating time, the daytime time zone mode 31A performs hot water heating operation during the daytime set operating time. In the operating state B, 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 in a day, the control device 30 calculates the night operating time in the night time mode 31B so that the total amount of hot water boiled is the total amount of hot water boiled. In nighttime time zone mode 31B, water is boiled for the calculated nighttime operation time. Since 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 based on the calculated nighttime operation time. In the nighttime mode 31B, the amount of hot water to be boiled at night is boiled during the calculated nighttime operation time, and in the daytime 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, heating operation is performed in nighttime time mode 31B to end at 6:00, and during the daytime hours, heating operation is performed in daytime time mode 31A from 12:00 to 16:00.

[0028] FIG. 3 is a control flow diagram of the water heater 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 boiled for the set operation time based on the set operation time in the daytime mode 31A (S3). Then, the control device 30 compares the total amount of hot water, which is the minimum amount of hot water determined in S2 and the set amount of hot water calculated in S3, with the total amount of hot water to be boiled in one day calculated in S1 (S4).

[0029] If the total amount of hot water is equal to or greater than the total amount of hot water boiled in one day (Yes in S4), the daytime operation time in daytime mode 31A is calculated so that the total amount of hot water becomes the total amount of hot water boiled (S5). The daytime operating time calculated in the daytime time zone mode 31A is compared with the set daytime operating time stored in the set condition storage means 33C by the daytime operating time comparison means 35B (S6). If the daytime set operation time is shorter than the daytime operation time (Yes in S6), the daytime operation end time determination means 35C determines the daytime operation end time stored in the set condition storage means 33C as the daytime operation end time in the daytime time zone mode 31A (S7). If the set daytime operation time is longer than the daytime operation time (No in S6), the daytime operation end determination means 35D determines whether operation should be ended based on the detected temperature (S9).

[0030] 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 (S8).

[0031] When the daytime operation end time in daytime time zone mode 31A is determined in S7, or the end of operation is determined based on the detected temperature in S9, and then the nighttime operation time in nighttime time zone mode 31B is calculated in S8, the nighttime operation start time in nighttime time zone mode 31B is determined (S10). In S10, when the daytime operation end time in daytime time zone mode 31A is determined in S7, the nighttime operation start time is determined using the minimum amount of hot water determined in S2, and when the nighttime operation time in nighttime time zone mode 31B is calculated in S8, the nighttime operation start time is determined using this nighttime operation time. Then, when the night-time operation start time determined in S10 arrives, the control device 30 starts the operation of the heating device 20, and continues boiling water in the night-time mode 31B until the preset night-time operation end time arrives (S11). 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 continues boiling water in the daytime time zone mode 31A until the daytime operation end time determined by S7 or the detected temperature detected by the remaining hot water temperature detection means 18a or the inlet water temperature detection means 18c reaches the set temperature (S12).

[0032] Here, the amount of hot water to be heated in the daytime time zone mode 31A in S12 is set to a predetermined ratio or more of the total amount of hot water to be heated in one day determined in S1. The predetermined ratio is preferably set to 50% or more, and by setting the predetermined ratio to 50% or more, daytime heating can be ensured. However, the predetermined ratio is not limited to 50%. During the daytime, less heat is released than at night, resulting in better heat retention, and higher temperatures result in more heat being pumped, so ensuring daytime heating is effective. Furthermore, when a heat pump device is used as the heating device 20, heating can be performed more efficiently during the daytime because the outside air temperature is higher than at night. Furthermore, in order to ensure that the amount of hot water boiled during the daytime in the daytime mode 31A is a predetermined ratio or more of the total amount of hot water boiled in a 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 the minimum daytime operating time set in advance, and by ensuring that the daytime boiling time is equal to or greater than the minimum daytime operating time, the operation between the daytime mode 31A and the nighttime mode 31B can be set to an optimal ratio.

[0033] As described above, this embodiment calculates the daytime operation time in daytime time slot mode 31A from the total daily volume of hot water to be heated determined based on the usage history, compares the calculated daytime operation time with the daytime set operation time set by operation means 40, and if the daytime set operation time is shorter than the daytime operation time, daytime time slot mode 31A performs the hot water heating operation for the daytime set operation time. If the daytime set operation time is longer than the daytime operation time, daytime time slot mode 31A starts the hot water heating operation at the time set by operation means 40 and ends the hot water heating operation when the temperature detected by remaining hot water temperature detection means 18a or inlet water temperature detection means 18c reaches the set temperature. Therefore, if the daytime set operation time is longer than the daytime operation time, instead of ending the hot water heating operation at the calculated daytime operation time, the hot water heating operation ends when the temperature detected by remaining hot water temperature detection means 18a or inlet water temperature detection means 18c reaches the set temperature, thereby eliminating unnecessary hot water heating and improving energy-saving performance.

[0034] FIG. 4 is a flow chart showing the procedure for setting the daytime operation hours in the hot water heater. The control device 30 stores in advance the daytime operation start time that can be set, the daytime operation end time that can be set, the minimum daytime operation time, and the recommended daytime operation time slot. The daytime operation start settable time is a time that can be set as the operation start time during the daytime hours. The daytime operation end settable time is a time that can be set as the operation end time during the daytime hours. The minimum daytime operation time is the operation time during which the heating operation must be performed during the daytime hours. The recommended daytime operation time period is an operation time period set after the daytime operation start time settable time and before the daytime operation end time settable time, during which it is preferable to perform the heating operation during the daytime, and is shorter than the maximum daytime operation settable time. Here, it is preferable that the minimum daytime operating time and the recommended daytime operating time slots are stored as a plurality of different power schemes. Fig. 4 shows, for example, that power scheme 1 has a minimum daytime operating time of four hours and a recommended daytime operating time slot of 10:00 to 15:00, power scheme 2 has a minimum daytime operating time of three hours and a recommended daytime operating time slot of 12:00 to 15:00, and power scheme 3 has a minimum daytime operating time of four hours and a recommended daytime operating time slot of 11:00 to 16:00. It is assumed that such power schemes may be set by region or by different power suppliers in the same region.

[0035] When setting the daytime operating hours, a selection display 41 is displayed on the operation means 40 to prompt the user to select an electricity system (S21). The user can select one of the electricity schemes displayed on the selection display 41 (S22). The control device 30 extracts data on the minimum operation time and recommended daytime operation time slots in the electricity system selected in S22 (S23). The time setting screen 42 is displayed on the operation means 40 (S24). In S24, it is preferable to display the minimum set time 43 before displaying the time setting screen 42. The time setting screen 42 displays the daytime operation start time and daytime operation end time to be set. When the user sets the daytime operation start time and daytime operation end time using the operating means 40, the recommended daytime operation start time and recommended daytime operation end time based on the recommended daytime operation time slot are displayed first. In this way, when the user sets the daytime operation start time and daytime operation end time, the recommended daytime operation time slot is displayed first, ensuring that daytime water heating operation is performed reliably. In FIG. 4, since "Electricity scheme 1" is selected in S22, "10:00" and "15:00" are displayed on the time setting screen 42. The user can change the displayed recommended daytime operation start time "10:00" and recommended daytime operation end time "15:00" to input the daytime operation start time and daytime operation end time (S25). When the input in S25 is confirmed on the time setting screen 42, the control means 30 calculates the input operation time from the input daytime operation start time and daytime operation end time (S26). The control means 30 determines whether the calculated input driving time is equal to or greater than the minimum daytime driving time (S27). If the input driving time is equal to or greater than the minimum daytime driving time, the setting is completed (S28), but if the input driving time is less than the minimum daytime driving time, an error in the setting is displayed (S29) and the user is asked to re-enter the time. That is, the process returns to S24 and the time setting screen 42 is displayed. When the setting is completed in S28, a setting acceptance completion screen 44 is displayed, and when an insufficient setting is displayed in S29, the minimum operating time is displayed and a resetting transition display screen 45 is displayed.

[0036] Note that the daytime operation start time and daytime operation end time cannot be set before the daytime operation start settable time or after the daytime operation end settable time using the operation means 40. However, even if it is not within the recommended daytime operation time slot, the daytime operation start time and daytime operation end time can be set after the daytime operation start settable time and before the daytime operation end settable time, as long as the time is equal to or longer than the minimum operation time. In this way, according to this embodiment, the recommended daytime operation start time and recommended daytime operation end time are displayed, which leads to the setting of the recommended daytime operation time period, and the input operation time is calculated from the input daytime operation start time and daytime operation end time, and the setting is completed if the calculated input operation time is equal to or greater than the minimum daytime operation time, thereby ensuring that the daytime heating time is secured. In addition, the control device 30 stores in advance multiple power systems, each with different minimum daytime operating hours and recommended daytime operating hours, and the user can select one of the multiple power systems using the operating means 40, making it easier to select optimal conditions. [Industrial Applicability]

[0037] According to the present invention, operation in the daytime mode can be performed effectively and efficiently. [Explanation of symbols]

[0038] 10 Hot water tank 11 Boiling piping 12 Hot water tap 13 Mixing valve 14 Water supply piping 15 Hot water supply piping 16 Circulation pump 17 Hot water flow rate detection means 18a Remaining hot water temperature detection means 18b Water supply temperature detection means 18c Inlet water temperature detection means 18d Boiling 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 Boiling water volume comparison method 35A Daytime operation time calculation method 35B Daytime driving time comparison means 35C Means for determining daytime operation end time 35D Means for determining the end of daytime operation 36A Nighttime driving time calculation method 36B Nighttime operation start time determination means 40 Operating means 41 Selection display 42 Time setting screen 43 Minimum setting time display 44 Setting acceptance completion screen 45 Resetting transition display screen

Claims

1. The hot water supply system comprises a hot water storage tank, a heating device for heating the hot water in the hot water storage tank, a control device, and an operating means; 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; and The operation means displays a time setting screen, When the user sets the daytime driving start time and the daytime driving end time using the operation means, a recommended daytime driving time zone is displayed, and the control device a daytime operation start settable time that can be set as the operation start time for the daytime time period; A daytime operation end settable time that can be set as an operation end time for the daytime time period; a minimum daytime operation time during which the heating operation must be performed during the daytime hours; The recommended daytime operation time period is set as a time period during which it is preferable to perform the heating operation during the daytime time period, and is set to a time period that is after the daytime operation start settable time and before the daytime operation end settable time, and is shorter than the maximum settable daytime operation time; is stored in advance, In the operation means, The daytime operation start time and the daytime operation end time cannot be set before the daytime operation start settable time or after the daytime operation end settable time, Even if the daytime operation start time and the daytime operation end time are not within the recommended daytime operation time period, the daytime operation start time and the daytime operation end time can be set as long as they are after the daytime operation start settable time and before the daytime operation end settable time, When the user sets the daytime operation start time and the daytime operation end time using the operation means, A recommended daytime driving start time and a recommended daytime driving end time according to the recommended daytime driving time slot are displayed, the user changes the displayed recommended daytime driving start time and the displayed recommended daytime driving end time, thereby inputting the daytime driving start time and the daytime driving end time; An input driving time is calculated from the input daytime driving start time and the input daytime driving end time, It is determined whether the calculated input driving time is equal to or greater than the minimum daytime driving time, If the input driving time is equal to or greater than the minimum daytime driving time, the setting is completed, and if the input driving time is less than the minimum daytime driving time, re-input is requested. A water heater characterized by:

2. a plurality of power supply systems each having different minimum daytime operating times and different recommended daytime operating times; The user can select one of the plurality of electricity systems by using the operation means. The water heater according to claim 1 .

3. By performing the boiling operation during the minimum daytime operation time, 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 one day.

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

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