Hot water supply system

Abstract

To provide a hot water supply system that can supply high-temperature hot water and operate with energy savings. [Solution] The hot water supply setting means 340 of the hot water supply device 1 can set a normal mode in which the upper limit temperature of the hot water supply setting temperature is a predetermined temperature, and a high-temperature boiling mode in which a high-temperature setting temperature higher than the predetermined temperature can be set as the upper limit temperature. The control means 350 that controls the heating process of the hot water has a table data in which the target temperature of the hot water to be heated is predetermined for each value obtained based on the amount of heat used in the hot water supply process over a predetermined period. When the normal mode is set, the target boiling temperature is determined based on the target temperature in the table data. When the high-temperature boiling mode is set, the target temperature in the table data that is lower than the high-temperature target temperature that can realize the supply of hot water at the high-temperature setting temperature is replaced with the high-temperature target temperature to determine the target boiling temperature.

Description

Technical Field

[0001] The present invention relates to a hot water supply device, and more particularly to a hot water supply device that heats the hot water in a hot water storage tank using heat pump heating means and supplies hot water using the hot water in the hot water storage tank.

Background Art

[0002] Conventionally, a hot water supply device that supplies hot water by heating the hot water in a hot water storage tank using heat pump heating means has been proposed (see Patent Document 1).

[0003] A user can use hot water at a desired temperature by setting the hot water supply temperature on an operation panel (remote controller).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The upper limit set temperature of the hot water that can be set on the operation panel is generally set to about 60°C in order to prevent burns caused by hot water. However, there are users who prefer hot water hotter than 60°C. Although it is conceivable to be able to set the upper limit set temperature of the operation panel to a temperature higher than 60°C, in a hot water supply device using heat pump heating means, a hot water supply management method is adopted in which the usage status such as the amount of hot water used and the set temperature within a predetermined period is measured, and the set temperature in the hot water storage tank is learned and set. Therefore, even if the set temperature of the operation panel is simply set to 60°C or higher, it is not easy to supply hot water at the set high temperature.

[0006] Furthermore, it is possible to learn and set the temperature in the hot water storage tank based on the assumption that the set temperature will always be 60°C or higher. However, if the system learns and sets the set temperature in this way, it becomes difficult to operate the hot water supply system in an energy-saving and thermally efficient manner (for example, by reducing power consumption by heating and storing only the minimum amount of hot water necessary).

[0007] This invention has been made in view of the above problems, and aims to provide a hot water supply device that can supply high-temperature hot water and enable energy-saving and efficient hot water supply operation. [Means for solving the problem]

[0008] To solve the above problems, the hot water supply device according to the present invention is a hot water supply device that heats the hot water in a hot water storage tank to a target temperature using a heat pump heating means, thereby supplying hot water at a hot water supply set temperature set by a hot water supply setting means, and has a control means that controls the heating process of the hot water by the heat pump heating means, the hot water supply setting means can be set to a normal mode in which the upper limit temperature of the hot water supply set temperature is a predetermined temperature, and a high-temperature boiling mode in which a high-temperature set temperature higher than the predetermined temperature can be set as the upper limit temperature of the hot water supply set temperature, and the control means controls the amount of hot water heat used in the hot water supply process over a predetermined period The system has a table data in which, for each value obtained based on the above, the target temperature of the hot water to be heated by the heat pump heating means is predetermined, and when the normal mode is set by the hot water supply setting means, the target boiling temperature is determined based on the target temperature defined in the table data, and when the high-temperature boiling mode is set by the hot water supply setting means, the target boiling temperature is determined by replacing the target temperature among the target temperatures defined in the table data that is lower than the high-temperature target temperature at which hot water can be supplied with hot water at the high-temperature setting temperature with the high-temperature target temperature.

[0009] Furthermore, in the hot water supply device described above, the value determined based on the hot water heat quantity may be a value that represents the amount of hot water required when the daily amount of hot water heat used in the hot water supply process during the predetermined period is converted into hot water at the predetermined temperature.

[0010] Furthermore, the high-temperature target temperature of the hot water supply system described above may be 5°C higher than the high-temperature set temperature.

[0011] Furthermore, the control means of the hot water supply device described above may also provide notification regarding the temperature of the hot water when the high-temperature boiling mode is set by the hot water setting means. [Effects of the Invention]

[0012] According to the hot water supply system of the present invention, high-temperature hot water can be supplied, enabling energy-saving and efficient hot water supply operation. [Brief explanation of the drawing]

[0013] [Figure 1] This is an explanatory diagram showing the schematic configuration of a hot water supply system according to an embodiment. [Figure 2] This is a front view showing a remote controller according to an embodiment. [Figure 3] (a) shows the main screen displayed on the remote controller's display unit, and (b) to (f) show the menu screens. [Figure 4] This is a table showing the conditions for determining the target boiling temperature set by the boiling temperature determination means according to the embodiment. [Modes for carrying out the invention]

[0014] An example of a hot water supply system according to the present invention will be shown and described in detail with reference to the drawings. Figure 1 is a diagram showing the schematic configuration of a hot water supply system according to an embodiment. The hot water supply system 1 includes a hot water storage unit 100 and a heat pump unit 200 (heat pump type heating means).

[0015] The hot water storage unit 100 includes a hot water storage tank 101 for storing hot water, a water supply pipe 102 for supplying water to the hot water storage tank 101, a pressure reducing valve 103 provided in the water supply pipe 102 for reducing the water supply pressure, a hot water outlet pipe 104 for discharging hot water from the top of the hot water storage tank 101, an overpressure relief valve 105 provided in the hot water outlet pipe 104 for releasing overpressure, and a water supply bypass pipe 106 branched from the water supply pipe 102 downstream of the pressure reducing valve 103. The system includes a hot water mixing valve 107 that mixes hot water from the outlet pipe 104 with water from the water supply bypass pipe 106, a hot water supply pipe 108 that supplies hot water from the hot water mixing valve 107, a hot water temperature sensor 109 installed on the hot water supply pipe 108, a hot water flow sensor 110 that detects the flow rate of hot water flowing through the hot water supply pipe 108, and a water supply temperature sensor 111 installed on the water supply bypass pipe 106 that detects the water supply temperature. A hot water tap 312 is connected to the end of the hot water supply pipe 108.

[0016] A bath heat exchanger 114 is installed at the top of the hot water storage tank 101, and the bath heat exchanger 114 is connected to the bathtub 313 via a bath circulation path 115. The bath circulation path 115 is equipped with a circulation pump 116, a bath return temperature sensor 117 that detects the temperature of the bath water returning from the bathtub 313 to the bath heat exchanger 114, a bath supply temperature sensor 118 that detects the temperature of the bath water going from the bath heat exchanger 114 to the bathtub 313, and a water level sensor 119 that detects the water level in the bathtub 313 by pressure. In addition, a hot water filling pipe 120 branched from the hot water supply pipe 108 is connected to the bath circulation path 115, and a hot water filling solenoid valve 121 that opens and closes the hot water filling pipe 120 is installed on the hot water filling pipe 120.

[0017] Furthermore, storage temperature sensors 122 (122a to 122e) for detecting the temperature of the hot water stored in various parts of the storage tank 101 are provided on the side of the storage tank 101. The storage temperature sensors 122 consist of a storage temperature sensor 122a for detecting the temperature of the hot water stored in the upper part of the storage tank 101, a storage temperature sensor 122b for detecting the temperature of the hot water stored near the bath heat exchanger 114, a storage temperature sensor 122c for detecting the temperature of the hot water stored below the bath heat exchanger 114, a storage temperature sensor 122d for detecting the temperature of the hot water stored in the middle part of the storage tank 101, and a 122e for detecting the temperature of the hot water stored in the lower part of the storage tank 101. The storage temperature sensors 122a to 122e are arranged with vertical spacing between them relative to the side of the storage tank 101.

[0018] The heat pump unit 200 functions as a heat pump type heating means that heats the hot water in the hot water storage tank 101 to a target temperature. The heat pump unit 200 includes a compressor 223 for compressing a refrigerant, a hot water heat exchanger 224 for heat exchange between the refrigerant and the hot water, an expansion valve 225 for depressurizing and expanding the refrigerant, an air heat exchanger 226 as an evaporator for evaporating the low-temperature refrigerant, and a blower fan 227 for blowing outside air into the air heat exchanger 226. The compressor 223, the hot water heat exchanger 224, the expansion valve 225, and the air heat exchanger 226 are connected in a ring shape by refrigerant piping 228. The refrigerant piping 228 is equipped with a refrigerant temperature sensor 229 for detecting the temperature of the refrigerant output from the compressor 223. The heat pump unit 200 is also equipped with an outside air temperature detection means 249 for detecting the outside air temperature.

[0019] The hot water storage unit 100 and the heat pump unit 200 are connected by a heating circulation path 330. The heating circulation path 330 connects the lower part of the hot water storage tank 101 and the inlet of the hot water supply heat exchanger 224, and connects the outlet of the hot water supply heat exchanger 224 and the upper part of the hot water storage tank 101, thereby forming a circulation path for hot water between the hot water storage unit 100 and the heat pump unit 200. In the heating circulation path 330, there are provided a heating circulation pump 331 provided in the heating circulation path 330 on the inlet side of the hot water supply heat exchanger 224 for circulating the hot water taken out from the lower part of the hot water storage tank 101 to the upper part of the hot water storage tank 101 via the hot water supply heat exchanger 224, an incoming water temperature sensor 332 for detecting the temperature of the hot water flowing into the hot water supply heat exchanger 224, and a boiling temperature sensor 333 for detecting the temperature of the hot water flowing out from the hot water supply heat exchanger 224.

[0020] The hot water supply device 1 is provided with a remote controller 340 (hot water supply setting means) for setting the hot water supply temperature and various necessary settings. FIG. 2 is a front view showing the remote controller 340, and FIGS. 3(a) to (f) are diagrams showing an example of a main screen and menu screens displayed on the display unit 341 of the remote controller 340.

[0021] As shown in FIG. 2, the remote controller 340 includes a display unit 341 for displaying a main screen (see FIG. 3(a)) showing the hot water supply set temperature, the bathtub set temperature, etc., and menu screens (see FIGS. 3(b) to (f)), a setting switch 342 composed of up, down, left, and right arrow keys for setting the hot water supply set temperature and the bathtub set temperature and for selecting menu items displayed on the display unit 341, a bathtub automatic switch 344 for performing a heat retention operation for a predetermined heat retention time following the filling of a predetermined amount of hot water into the bathtub 313, a reheating switch 345 for performing a reheating operation for heating the bathtub water, and a menu determination switch 343 for displaying menu items on the display unit 341 and for determining the item selected by the setting switch 342.

[0022] In a general water heater, in a state where the main screen is displayed on the display unit 341 (see Fig. 2 or Fig. 3(a)), by operating the up or down key of the setting switch 342, the temperature of the hot water supply setting temperature or the bathtub setting temperature can be set. The upper limit value (upper limit setting temperature) of the hot water supply setting temperature that can be set in a general water heater is set to 60°C. In the case of water at 60°C, if the water continues to touch the skin for about 5 seconds, it will cause burns. Therefore, by setting the upper limit setting temperature to 60°C, the risk of the user getting burned can be reduced.

[0023] On the other hand, there are users who prefer hot water at a higher temperature and there is a desire to set the upper limit setting temperature higher than 60°C. For this reason, in the water heater 1, a "high-temperature boiling mode" is provided, and by the user setting the high-temperature boiling mode on the menu screen using the menu decision switch 343 and the setting switch 342, the upper limit setting temperature in the remote controller 340 can be set to a higher temperature (for example, 75°C: high-temperature setting temperature) than the normal temperature (60°C).

[0024] Specifically, as shown in Fig. 2 and Fig. 3(a), when the main screen 500 is displayed on the display unit 341 of the remote controller 340, by pressing the menu decision switch 343, as shown in Fig. 3(b), the display on the display unit 341 transitions to the "main menu screen" 510. By selecting "options" 511 with the arrow keys of the setting switch 342 and pressing the menu decision switch 343, the display on the display unit 341 transitions to the "options screen" 520 shown in Fig. 3(c).

[0025] On the "Options screen" 520, if you select "Other settings" 521 using the setting switch 342 and press the menu / confirm switch 343, the display on the display unit 341 will transition to the "Other settings screen" 530, as shown in Figure 3(d), and you will be able to select "High temperature boiling mode" 531. If you select and confirm "High temperature boiling mode" 531 on the "Other settings screen" 530, the "High temperature boiling mode screen" 540 will appear, as shown in Figure 3(e), and the explanation "You can store hot water at a higher temperature than usual" 541 will be displayed on the "High temperature boiling mode screen" 540, and you will be able to select whether to "set" 542 or "cancel" 543 "High temperature boiling mode". If you select and confirm "Set" 542 here, the "High temperature boiling mode" will be set, and the display on the display unit 341 will display a warning message (warning display: notification regarding the temperature of the hot water) as shown in Figure 3(f), saying "Please use with caution to avoid burns" 544.

[0026] As mentioned above, when the water temperature is 60°C, burns will not occur unless the water is in contact with the skin for about 5 seconds. However, if the water temperature is 75°C, burns may occur in a shorter time. Therefore, when a user operates the remote controller 340 to set the "high-temperature boiling mode," a warning about burns can be displayed on the display unit 341 to alert the user to the risk of high-temperature water supply.

[0027] As shown in Figure 1, the hot water heater 1 is equipped with a control means 350 that controls the operation of the hot water heater 1. The control means 350 stores a program for controlling various operations in the hot water heater 1. Specifically, the control means 350 can implement various functions such as calculation, comparison, storage, and counting functions based on the program. Furthermore, the control means 350 receives various values ​​detected by the hot water temperature sensor 109, hot water flow rate sensor 110, water supply temperature sensor 111, bath return temperature sensor 117, bath supply temperature sensor 118, water level sensor 119, hot water storage temperature sensors 122a to 122e, refrigerant temperature sensor 229, inlet water temperature sensor 332, boiling temperature sensor 333, outside temperature detection means 249, etc. Based on the detected values, the control means 350 controls the drive of the hot water mixing valve 107, bath circulation pump 116, bath filling solenoid valve 121, compressor 223, expansion valve 225, blower fan 227, and heating circulation pump 331 to perform processes such as boiling operation, hot water supply operation, and bath heating operation. The control means 350 is also connected to the remote controller 340 for communication.

[0028] The control means 350 includes a bath heating record storage means 351 that stores the operating record of "bath heating operation, which circulates the bath water in the bathtub 313 to the bath heat exchanger 114 and heats the bath water to the set bath temperature", a high temperature setting mode storage means 352 that stores whether the high temperature setting mode has been set or canceled, and a boiling temperature determination means 353 that determines the boiling target temperature, which is the target temperature of "the hot water that is heated by the heat pump unit 200 and stored in the hot water storage tank 101".

[0029] Furthermore, the control means 350 includes a hot water heat quantity integration means 354 that detects the amount of hot water heat supplied from the hot water storage tank 101 during the day, and a hot water heat quantity determination means 355 that determines whether the amount of hot water heat in the hot water storage tank 101 that can contribute to the bath heating operation is equal to or greater than a predetermined amount. The hot water heat quantity integration means 354 calculates, integrates, and stores the amount of hot water heat supplied for each hot water supply operation based on the flow rate detected by the hot water flow rate sensor 110, the water supply temperature detected by the water supply temperature sensor 111, and the hot water supply set temperature set by the remote controller 340. The hot water heat quantity determination means 355 determines whether the amount of hot water heat that can contribute to the bath heating operation is equal to or greater than a predetermined amount based on whether the hot water temperature sensor 122c, which detects the hot water temperature near the middle of the hot water storage tank 101 and below the bath heat exchanger 114, detects a predetermined temperature (in this case, 70°C) or higher.

[0030] The hot water heat quantity integration means 354 may calculate the difference between the amount of stored hot water heat after the completion of the heating operation at the end of the nighttime period and the amount of stored hot water heat before the start of the heating operation at the start of the nighttime period, based on the detected values ​​detected by the stored hot water temperature sensor 122. Alternatively, the stored hot water heat quantity determination means 355 may calculate the amount of stored hot water heat that can contribute to the bath heating operation based on the respective stored hot water temperatures detected by the stored hot water temperature sensors 122a to 122c, the stored hot water capacity pre-assigned to each stored hot water temperature sensor 122a to 122c, and a predetermined temperature higher than the bath set temperature.

[0031] The bath heating history storage means 351 stores the fact that a bath heating operation has been performed for a predetermined period (for example, 7 days) when the bath heating operation is performed, and clears the stored bath heating operation history when no bath heating operation is performed for a predetermined period (7 days) consecutively.

[0032] As described above, the high-temperature setting mode storage means 352 stores information indicating that the high-temperature boiling mode has been set when the high-temperature boiling mode setting operation is performed by the remote controller 340, and stores information indicating that the high-temperature boiling mode has been canceled when the high-temperature boiling mode cancellation operation is performed. Alternatively, the system may be configured to store information indicating that the high-temperature boiling mode has been set when the high-temperature boiling mode setting operation is performed, and to clear the information indicating that the high-temperature boiling mode has been set when the high-temperature boiling mode cancellation operation is performed.

[0033] The water heating temperature determination means 353 determines the daily amount of hot water heat supplied based on the hot water heat supply load, and more specifically, based on the amount of hot water heat supplied over a predetermined period (e.g., 7 days) accumulated by the hot water heat supply integration means 354. Based on the determined daily amount of hot water heat supplied (hot water information), it determines the target water heating temperature. The water heating temperature determination means 353 has table data for determining the target water heating temperature.

[0034] Figure 4 shows table data indicating the conditions for determining the target boiling temperature determined by the boiling temperature determination means 353. In the table data shown in Figure 4, for example, the amount of heat supplied from the hot water used in the hot water supply treatment for 7 days (a predetermined period) is measured, the amount of heat supplied per day is calculated from the measured amount of heat supplied, and the target boiling temperature is defined for each value (amount of hot water: in liters) of the amount of hot water required when the calculated amount of hot water supplied per day is converted to hot water at 42°C (a predetermined temperature).

[0035] Furthermore, as shown in the table data of Figure 4, the boiling temperature determination means 353 determines the target boiling temperature according to two modes: normal mode and high-temperature boiling mode. Normal mode refers to the case where the high-temperature setting mode storage means 352 stores information indicating that the high-temperature boiling mode has been deactivated. High-temperature boiling mode refers to the case where the high-temperature setting mode storage means 352 stores information indicating that the high-temperature boiling mode has been set.

[0036] Comparing the normal mode and the high-temperature boiling mode, the difference lies in the fact that in the normal mode, the target boiling temperature is defined as being in the range of 65°C to 90°C, whereas in the high-temperature boiling mode, it is defined as being in the range of 80°C to 90°C. In the boiling temperature determination means 353 according to this embodiment, in the normal mode, temperatures below 80°C (65°C or 70°C in the "normal mode" table data in Figure 4) are all defined as 80°C (high-temperature target temperature) in the high-temperature boiling mode.

[0037] In normal mode, the upper limit of the hot water supply temperature that can be set by the remote controller 340 is 60°C. Therefore, if the target temperature for heating is set to 65°C or higher, which is slightly higher than 60°C, it is possible to supply hot water at 60°C. On the other hand, in high-temperature heating mode, the upper limit of the hot water supply temperature that can be set by the remote controller 340 is 75°C. Therefore, if the target temperature for heating is not set to a temperature higher than 75°C, it is not possible to supply hot water at 75°C. For this reason, in high-temperature heating mode, the heating temperature determination means 353 uniformly raises the target temperature for heating, which is set to 75°C or lower in normal mode, to 80°C (high-temperature target temperature), thereby enabling the supply of hot water at 75°C (high-temperature set temperature).

[0038] Furthermore, the boiling temperature determination means 353 changes the target boiling temperature so that the determined temperature is 80°C or higher only when information indicating that the high-temperature boiling mode has been set is stored in the high-temperature setting mode storage means 352. Therefore, even if it is difficult to supply 75°C hot water in the "normal mode" shown in Figure 4, the target boiling temperature is uniformly raised to 80°C in the "high-temperature boiling mode," making it possible to supply 75°C hot water without being affected by the learning results based on usage conditions such as the amount of hot water used.

[0039] Furthermore, when the "high-temperature boiling mode" is deactivated and information indicating that the high-temperature boiling mode has been deactivated is stored in the high-temperature setting mode storage means 352, the target boiling temperature is quickly returned to the "normal mode" temperature (65°C, 70°C in the table data of Figure 4). As a result, the use of hot water in "high-temperature boiling mode" becomes less affected by the learning results based on the usage of hot water, enabling energy-saving and efficient hot water supply operation.

[0040] In this way, each time the user operates the remote controller 340 to set or cancel the high-temperature boiling mode, the target boiling temperature can be quickly corrected or changed. Therefore, in normal mode, the target boiling temperature can be set to a relatively low temperature, allowing for energy-saving and efficient hot water supply operation of the hot water supply device 1, while in high-temperature boiling mode, the hot water temperature can be quickly and reliably increased and supplied according to the user's needs.

[0041] Furthermore, in the hot water supply device 1 according to this embodiment, the target temperature for heating is changed to 80°C or higher only when the user sets the high-temperature boiling mode, based on the hot water supply processing in normal mode. Therefore, there is no need to change the learning processes of the bath heating history storage means 351, the hot water heat quantity integration means 354, the hot water storage heat quantity determination means 355, etc. As a result, the hot water temperature can be quickly and reliably raised to a high temperature according to the user's needs without significantly changing the program processing of the conventionally used control means 350, and it is possible to achieve energy-saving hot water supply operation with excellent thermal efficiency in normal mode.

[0042] When the hot water tap 312 is opened and the hot water flow sensor 110 detects a flow rate greater than or equal to the amount that indicates the start of hot water supply, the control means 350 adjusts the opening of the hot water mixing valve 107 so that the hot water temperature detected by the hot water temperature sensor 109 becomes the hot water set temperature set by the remote controller 340, and mixes the hot water from the outlet pipe 104 with the cold water from the water supply bypass pipe 106 to supply hot and cold water.

[0043] Furthermore, when the automatic bath switch 344 of the remote controller 340 is turned on, the control means 350 opens the hot water filling solenoid valve 121 and adjusts the opening of the hot water mixing valve 107 so that the hot water temperature detected by the hot water temperature sensor 109 becomes the bath set temperature set in the remote controller 340, thereby filling the bath with water at the set temperature. Then, when the "cumulative flow rate since the opening of the hot water filling solenoid valve 121," detected by the hot water flow rate sensor 110, reaches the amount of hot water to be filled that has been set in advance in the remote controller 340, the control means 350 closes the hot water filling solenoid valve 121.

[0044] Once the bath filling operation is complete, the control means 350 performs a heat retention operation for a predetermined time (for example, 2 hours). During this heat retention operation, the bath circulation pump 116 is periodically driven to check the bath water temperature, and if it is below the set bath temperature, a request for bath heating is made and the water is heated to the set bath temperature. However, if the predetermined heat retention time has elapsed since the completion of the bath filling operation, the control means 350 does not perform the bath water heat retention operation.

[0045] Furthermore, when the reheat switch 345 of the remote controller 340 is turned on, the control means 350 determines that there is a request to heat the bath and performs a reheat operation to heat the bath to the set temperature.

[0046] The hot water supply system according to the present invention has been described above using the hot water supply system 1 shown in the embodiment as an example. However, the hot water supply system according to the present invention is not limited to the configuration of the hot water supply system 1 shown in the embodiment.

[0047] In the embodiment, the boiling temperature determination means 353 was described in which the daily amount of hot water heat supplied is determined based on the amount of hot water heat supplied for a predetermined period (for example, 7 days) accumulated by the hot water heat supply heat supply integration means 354, and the target boiling temperature is determined according to the determined daily amount of hot water heat supplied (hot water supply information). However, the conditions for determining the target boiling temperature by the boiling temperature determination means 353 are not limited to the daily amount of hot water heat supplied, but can also be determined by considering information regarding other hot water supply loads.

[0048] For example, the conditions for determining the target heating temperature in the heating temperature determination means 353 according to the embodiment may include considering the ambient temperature information detected by the ambient temperature detection means 249. Alternatively, the conditions for determining the target heating temperature may include whether the amount of heat stored in the hot water storage tank 101, as determined by the hot water storage heat amount determination means 355, is equal to or greater than a predetermined amount.

[0049] Furthermore, the control means for the hot water supply system according to the present invention determines the target boiling temperature according to the hot water supply load, and when the high-temperature boiling mode is set, it is sufficient to set (determine) the target boiling temperature to a temperature higher than the upper limit temperature of the hot water supply setting temperature. For this reason, the specific contents and conditions related to the hot water supply load and the contents and conditions based on the hot water heat quantity used by the boiling temperature determination means 353 shown in the embodiment to determine the target boiling temperature are not particularly limited.

[0050] Furthermore, in the embodiment described a case where, when the high-temperature boiling mode is set, the remote controller 340 can set the hot water supply setting temperature up to 75°C (high-temperature setting temperature), and the target boiling temperature in the high-temperature boiling mode is uniformly raised to 80°C (high-temperature target temperature). However, the high-temperature setting temperature that can be set in the high-temperature setting mode is not limited to 75°C; it can be any temperature higher than the normal setting temperature (for example, 60°C), and the specific setting temperature is not limited.

[0051] Furthermore, although the embodiment described a case where the high-temperature setting temperature is 75°C and the high-temperature target temperature is 80°C (5°C higher than the high-temperature setting temperature), the high-temperature target temperature is not limited to 5°C higher than the high-temperature setting temperature, as long as it is a temperature at which hot water at the high-temperature setting temperature can be supplied. For example, even if the high-temperature target temperature is 5°C or more (for example, about 10°C) higher than the high-temperature setting temperature, it is still possible to supply hot water at the high-temperature setting temperature, and such a temperature difference is acceptable. However, if the temperature difference between the high-temperature target temperature and the high-temperature setting temperature is large, it becomes necessary to heat the hot water in the hot water storage tank 101 to a temperature higher than the temperature of the hot water required for hot water supply (high-temperature setting temperature), making it difficult to operate the hot water supply in an energy-saving and efficient manner. For this reason, by setting the high-temperature target temperature to 5°C higher than the high-temperature setting temperature, it becomes possible to reliably supply hot water at the high-temperature setting temperature during hot water supply, and to achieve a more energy-saving and efficient hot water supply operation.

[0052] Furthermore, in the hot water supply device 1 according to the embodiment, the user can set the high-temperature boiling mode on the menu screen using the menu / decision switch 343 and the setting switch 342, thereby setting the upper limit temperature setting on the remote controller 340 to a higher temperature (e.g., 75°C: high-temperature setting temperature) than the normal temperature (60°C). However, it is also possible to set the temperature setting on the remote controller 340 to a high temperature (e.g., 75°C: high-temperature setting temperature) or higher at all times, regardless of the setting of the high-temperature boiling mode. [Explanation of Symbols]

[0053] 1 ... Hot water supply system 100 ... Hot water storage unit 101... Hot water storage tank 200 ... Heat pump unit (heat pump type heating means) 249 ... means for detecting outside temperature 340 ... Remote controller (hot water setting method) 350 ... control means 351 …(Control means) Bath heating record storage means 352 …(Control means) High temperature setting mode storage means 353 …(Control means) means for determining boiling temperature 354 …(Control means) Hot water heat quantity integration means 355 …(Control means) means for determining the amount of heat stored in hot water 500 … (Remote controller) main screen 510 …(Remote controller) main menu screen

Claims

1. A hot water supply system that heats the hot water in a hot water storage tank to a target temperature using a heat pump heating means, thereby supplying hot water at a set temperature set by a hot water supply setting means, The system includes a control means for controlling the heating process of the hot water by the heat pump heating means, The hot water supply setting means can be set to a normal mode in which the upper limit temperature of the hot water supply setting temperature is a predetermined temperature, and a high-temperature boiling mode in which a high-temperature setting temperature higher than the predetermined temperature can be set as the upper limit temperature of the hot water supply setting temperature. The control means is The table data contains predetermined target temperatures for the hot water heated by the heat pump heating means, based on the amount of heat used in hot water treatment over a predetermined period. When the normal mode is set by the hot water setting means, the target temperature for boiling is determined based on the target temperature specified in the table data. When the high-temperature boiling mode is set by the hot water supply setting means, the target temperature for boiling is determined by replacing the target temperature among the target temperatures defined in the table data that is lower than the high-temperature target temperature at which hot water supply with hot water at the high-temperature setting temperature can be achieved with the high-temperature target temperature. A hot water supply system characterized by the following features.

2. The value determined based on the aforementioned hot water heat quantity is the amount of hot water required when the daily amount of hot water heat used in the hot water treatment during the predetermined period is converted into hot water at the predetermined temperature. The hot water supply device according to claim 1, characterized by the following:

3. The aforementioned high-temperature target temperature is 5°C higher than the aforementioned high-temperature set temperature. The hot water supply device according to claim 1, characterized by the following:

4. The control means provides notification regarding the temperature of the hot water when the high-temperature boiling mode is set by the hot water setting means. The hot water supply device according to claim 1, characterized by the following:

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