JP6310679B2 - Hot water system - Google Patents

Description

  The technology disclosed in this specification relates to a hot water supply system.

  Patent Document 1 discloses a first heating source for heating hot water, a tank for storing hot water heated by the first heating source, a second heating source for heating hot water sent from the tank to a hot water supply location, and tank hot water storage. A hot water supply system including a display device that displays a system state including a quantity is disclosed. In this hot water supply system, since the remaining amount of hot water heated by the first heating source is displayed as the amount of hot water stored in the tank, the user can determine whether the energy consumed by the hot water supply is derived from the first heating source or the second heating. It is possible to appropriately grasp whether it is derived from the source.

JP 2011-149656 A

  In the hot water supply system as described above, there are cases where heating by the second heating source must be performed even though a sufficient amount of hot water remains in the tank. For example, if the temperature of hot water that can be supplied from the tank becomes lower than the preset hot water supply temperature due to natural heat dissipation from the tank or a change in the hot water supply preset temperature, a sufficient amount of hot water remains in the tank. However, in order to perform hot water supply at the hot water supply set temperature, it is necessary to perform heating by the second heating source. Many users of the hot water supply system think that heating by the second heating source is unnecessary if a sufficient amount of hot water is stored in the tank. Therefore, in such a case, a strange impression is given to the user. . A technique that allows the user to accurately grasp whether or not heating by the second heating source is necessary is expected.

  In this specification, in the hot water supply system provided with the tank which stores the hot water heated with the 1st heating source, and the 2nd heating source which heats the hot water sent from a tank to a hot-water supply location, the necessity of the heating by a 2nd heating source is required. Provide a technology that allows the user to accurately grasp

A hot water supply system disclosed in the present specification includes a first heating source that heats hot water, a tank that stores hot water heated by the first heating source, and a hot water temperature acquisition unit that acquires the temperature of hot water that can be supplied from the tank. And a second heating source for heating the hot water sent from the tank to the hot water supply location, and a display device for displaying the system status including the amount of hot water stored in the tank. In the hot water supply system, when the temperature of hot water that can be supplied from the tank is higher than the reference temperature based on the hot water supply set temperature, the display device supplies hot water at the hot water supply set temperature without heating the system state by the second heating source. If the temperature of the hot water that can be supplied from the tank is lower than the reference temperature, the display device performs hot water supply at the hot water supply set temperature. It displays in the 2nd display mode which shows that the heating by a 2nd heating source is needed . The amount of hot water stored in the tank here refers to the amount of hot water having a temperature equal to or higher than a predetermined lower limit temperature among hot water stored in the tank. For example, the amount of hot water having a temperature equal to or higher than the lower limit temperature that can be set as the hot water supply set temperature among hot water stored in the tank may be used as the tank hot water storage amount. Alternatively, among the hot water stored in the tank, the amount of hot water having a temperature equal to or higher than the water supply temperature from an external water supply source such as a water supply may be used as the tank hot water storage amount.

  In the hot water supply system described above, the display state of the system state is different between the case where the temperature of hot water that can be supplied from the tank is equal to or higher than the reference temperature and the case where the temperature of hot water that can be supplied from the tank is lower than the reference temperature. The reference temperature is specified based on the hot water supply set temperature. The reference temperature may be, for example, the hot water supply set temperature itself, or may be a temperature obtained by adding a predetermined temperature to the hot water supply set temperature. If the temperature of hot water that can be supplied from the tank is equal to or higher than the reference temperature, hot water can be supplied at the hot water supply set temperature for the time being without heating by the second heating source. Conversely, if the temperature of hot water that can be supplied from the tank is lower than the reference temperature, heating by the second heating source is required to perform hot water supply at the hot water supply set temperature. Therefore, in the above hot water supply system, when the temperature of hot water that can be supplied from the tank is equal to or higher than the reference temperature, the display device displays the system state in the first display mode, and the temperature of hot water that can be supplied from the tank is lower than the reference temperature. In the case, the display device displays the system state in the second display mode. With such a configuration, the user can accurately grasp whether or not the hot water supply system can supply hot water without performing heating by the second heating source from the display state of the system state.

  In the above hot water supply system, when the amount of hot water stored in the tank is smaller than the reference amount of hot water, even if the temperature of the hot water that can be supplied from the tank is higher than the reference temperature, the display device displays the system state in the second display mode. Can be configured to.

  In the hot water supply operation of the hot water supply system, even when the temperature of hot water that can be supplied from the tank is equal to or higher than the reference temperature, heating by the second heating source may be performed. If the hot water in the tank is used up and then switched to heating by the second heating source, the hot water supply temperature will be temporarily lowered if the piping group of the second heating source has cooled down. In order to cope with this, if heating with the second heating source is performed from the point in time when still hot water remains in the tank and the piping group of the second heating source is heated with the hot water from the tank, It is possible to prevent a decrease in hot water supply temperature when hot water runs out. Therefore, in the hot water supply operation, when the amount of hot water stored in the tank is smaller than the reference hot water amount, heating by the second heating source may be performed even if the temperature of the hot water that can be supplied from the tank is equal to or higher than the reference temperature. In such a case, even if the temperature of hot water that can be supplied from the tank is equal to or higher than the reference temperature, the display device displays the system state in the second display mode, thereby determining whether the heating by the second heating source is necessary. It is possible to accurately reflect the state display mode.

  In the above hot water supply system, when the elapsed time from the end of the previous hot water supply exceeds the reference time, even if the temperature of hot water that can be supplied from the tank is higher than the reference temperature, the display device changes the system state to the second state. It can comprise so that it may display in a display mode.

  When a certain amount of time has elapsed since the previous hot water supply operation, it is assumed that the piping group of the second heating source has cooled. For this reason, when a certain amount of time has passed since the previous hot water supply operation, even if the temperature of the hot water that can be supplied from the tank is equal to or higher than the reference temperature, the hot water from the tank can be obtained by heating with the second heating source. Thus, the piping group of the second heating source can be warmed. In such a case, even if the temperature of hot water that can be supplied from the tank is equal to or higher than the reference temperature, the display device displays the system state in the second display mode, thereby determining whether the heating by the second heating source is necessary. It is possible to accurately reflect the state display mode.

  The hot water supply system described above further includes environmental temperature acquisition means for acquiring the environmental temperature, and can be configured such that the reference hot water amount and / or the reference time are changed according to the environmental temperature.

  As described above, the hot water supply system is configured to perform heating by the second heating source when the amount of hot water stored in the tank is smaller than the reference hot water amount or when the elapsed time from the end of the previous hot water supply operation exceeds the reference time. In such a case, the reference hot water amount and the reference time may be changed according to the environmental temperature of the hot water supply system. The environmental temperature here may be, for example, the outside air temperature, or may be a water supply temperature from an external water supply source. For example, when the ambient temperature is lower than a predetermined temperature, heating by the second heating source is started at an appropriate timing by setting the reference hot water amount to a larger amount and / or setting the reference time to a shorter time. . In such a case, by specifying the display state of the system state based on the reference hot water amount and / or the reference time changed according to the environmental temperature, the display of the system state can indicate whether or not heating by the second heating source is necessary. It can be accurately reflected in the embodiment.

The figure which shows typically the structure of the hot water supply system 2 which concerns on an Example. The figure which shows the external appearance of the remote control 76 which concerns on an Example. The figure which shows the example of the display mode of the hot water storage icon 104 which concerns on an Example. The figure which shows another example of the display mode of the hot water storage icon 104 which concerns on an Example. The figure which shows another example of the display mode of the hot water storage icon 104 which concerns on an Example.

(Example)
As shown in FIG. 1, the hot water supply system 2 according to this embodiment includes an HP (heat pump) unit 4, a tank unit 6, and a burner unit 8.

  The HP unit 4 is a heat source that absorbs heat from outside air and heats water. The HP unit 4 includes a compressor 10, a condenser 12, an expansion valve 14, and an evaporator 16. The compressor 10 pressurizes the refrigerant to a high temperature and a high pressure. The condenser 12 cools the refrigerant by exchanging heat with water. The expansion valve 14 depressurizes the refrigerant to low temperature and low pressure. The evaporator 16 heats the refrigerant by exchanging heat with the outside air. The HP unit 4 circulates a refrigerant (for example, a fluorocarbon refrigerant) in the order of the compressor 10, the condenser 12, the expansion valve 14, and the evaporator 16, thereby absorbing heat from outside air and heating water. The HP unit 4 further includes a circulation pump 18 that circulates water through the condenser 12, a return thermistor 20 that detects the temperature of water flowing into the condenser 12, and a forward thermistor 22 that detects the temperature of water flowing out of the condenser 12. The outside temperature thermistor 23 for detecting the outside temperature and the HP controller 24 for controlling the operation of each component of the HP unit 4 are provided.

  The tank unit 6 includes a tank 30, a mixing valve 32, and a bypass control valve 34. The tank 30 is a sealed container that is covered with a heat insulating material and stores water therein. The capacity of the tank 30 of this embodiment is, for example, 100 liters. When the circulation pump 18 of the HP unit 4 is driven, water is sucked out from the bottom of the tank 30 and sent to the condenser 12. The water heated by the condenser 12 and having a high temperature is returned from the top of the tank 30 into the tank 30. When the water heated by the HP unit 4 flows into the tank 30, a temperature stratification is formed in the tank 30 in which a high-temperature water layer is stacked on a low-temperature water layer. An upper thermistor 36 that detects the temperature of the upper water, an intermediate thermistor 37 that detects the temperature of the intermediate water, and a lower thermistor 38 that detects the temperature of the lower water are attached to the tank 30. In this embodiment, the upper thermistor 36 is disposed at a position 6 liters from the top of the tank 30, the intermediate thermistor 37 is disposed at a position 12 liters from the top of the tank 30, and the lower thermistor 38 is disposed at the tank 30. 30 liters from the top of the.

  Tap water is supplied to the tank unit 6 through the water supply path 40. In the water supply path 40, a pressure reducing valve 42 for reducing the water supply pressure and a water inlet thermistor 44 for detecting the water supply temperature are attached. The water supply path 40 branches into a tank water supply path 46 that communicates with the bottom of the tank 30 and a tank bypass path 48 that communicates with the mixing valve 32. Check valves 50 and 52 are attached to the tank water supply path 46 and the tank bypass path 48, respectively. Further, a water-side water amount sensor 54 that detects the flow rate of tap water flowing into the mixing valve 32 is attached to the tank bypass path 48. The top of the tank 30 and the mixing valve 32 communicate with each other via a tank hot water path 56. A check valve 58 and a hot water sensor 60 for detecting the flow rate of water from the tank 30 flowing into the mixing valve 32 are attached to the tank discharge path 56.

  The mixing valve 32 mixes the tap water flowing from the tank bypass passage 48 and the water from the tank 30 flowing from the tank discharge passage 56 and sends it out to the first hot water supply passage 62. The mixing valve 32 is driven by a stepping motor to adjust the opening degree on the tank bypass path 48 side (opening side on the water side) and the opening degree on the tank discharge path 56 side (opening side on the hot water side). A mixing thermistor 64 that detects the temperature of the water fed from the mixing valve 32 is attached to the first hot water supply path 62.

  Hot water is supplied from the tank unit 6 to hot water supply points such as a kitchen, a shower, and a currant through the second hot water supply path 66. A hot water supply outlet thermistor 68 that detects the temperature of water supplied to the hot water supply location and a check valve 70 are attached to the second hot water supply path 66. The first hot water supply path 62 and the second hot water supply path 66 communicate with each other through a hot water supply bypass path 72. A bypass control valve 34 is attached to the hot water supply bypass path 72.

  The tank unit 6 further includes a tank controller 74 and a remote controller 76 that can communicate with the tank controller 74. The tank controller 74 controls the operation of each component of the tank unit 6. The remote control 76 accepts various operation inputs from the user via switches, buttons, and the like. In addition, the remote controller 76 notifies the user of various types of information related to the settings and operations of the hot water supply system 2 by display and sound.

  The burner unit 8 includes a burner 80, a heat exchanger 82, a bypass servo 84, a water amount servo 86, and a hot water valve 88. The burner 80 is a heat source for heating water flowing through the heat exchanger 82 by gas combustion. Water from the first hot water supply path 62 of the tank unit 6 flows into the heat exchanger 82 via the burner forward path 90. The water that has passed through the heat exchanger 82 flows out to the second hot water supply path 66 of the tank unit 6 through the burner return path 92. A water quantity servo 86 for adjusting the flow rate of water flowing into the heat exchanger 82 is attached to the burner forward path 90. The burner forward path 90 and the burner return path 92 communicate with each other via a burner bypass path 94. A bypass servo 84 is attached to a connection portion between the burner forward path 90 and the burner bypass path 94. The bypass servo 84 adjusts the flow rate of water flowing from the burner forward path 90 to the burner bypass path 94. A burner hot water thermistor 96 that detects the temperature of water flowing out from the heat exchanger 82 is attached to the burner return path 92. A hot water path 98 branches off from the burner return path 92. A hot water valve 88 is attached to the hot water path 98. Hot water is poured from the burner unit 8 to the bathtub, which is a hot water supply location, via the hot water path 98. The burner unit 8 further includes a burner controller 100 that controls the operation of each component of the burner unit 8.

  The HP controller 24 and the tank controller 74 can communicate with each other. The tank controller 74 and the burner controller 100 can communicate with each other. Therefore, the hot water supply system 2 can perform various operations such as a boiling operation and a hot water supply operation by the HP controller 24, the tank controller 74, and the burner controller 100 performing control in cooperation. Hereinafter, the HP controller 24, the tank controller 74, and the burner controller 100 are collectively referred to simply as a controller.

  Below, the boiling operation and hot water supply operation which the hot water supply system 2 performs are demonstrated.

  In the boiling operation, the hot water supply system 2 drives the HP unit 4 to boil the water in the tank 30. The timing for starting the boiling operation can be set from various viewpoints. For example, the controller may determine the start timing of the boiling operation so that the boiling of the water in the tank 30 ends immediately before the time period in which cheap midnight power can be used ends. Alternatively, the controller determines the start timing of the boiling operation so that the boiling of the water in the tank 30 is completed immediately before the time when a large demand for hot water supply is expected based on the actual hot water supply results up to the previous day. Also good. Alternatively, the controller may start the boiling operation when the user instructs the boiling of water in the tank 30 via the remote controller 76.

  When the boiling operation is started, the controller drives the compressor 10 to circulate the refrigerant in the order of the compressor 10, the condenser 12, the expansion valve 14, and the evaporator 16, and drives the circulation pump 18. The water is circulated between the tank 30 and the condenser 12. As a result, the water sucked from the bottom of the tank 30 is heated to the boiling temperature in the condenser 12 and returned to the top of the tank 30. When all the water in the tank 30 is replaced with water heated to the boiling temperature, the controller ends the boiling operation.

  In the hot water supply operation, water at a hot water supply set temperature is supplied to the hot water supply location. In the hot water supply system 2 of the present embodiment, for example, when the amount of water (hot water supply amount) obtained by adding the amount of water detected by the water side water amount sensor 54 and the amount of water detected by the hot water side water amount sensor 60 exceeds a predetermined value. Start hot water operation.

  When the hot water supply operation is started, the controller determines whether or not the temperature detected by the upper thermistor 36 of the tank 30 is equal to or higher than the hot water supply set temperature. When the temperature detected by the upper thermistor 36 is equal to or higher than the hot water supply set temperature, the controller prohibits the combustion operation of the burner 80 and mixes the mixing valve so that the temperature detected by the mixed thermistor 64 becomes the hot water supply set temperature. Adjust the opening of 32. In this case, the high temperature water supplied from the upper part of the tank 30 and the low temperature tap water supplied from the water supply path are mixed in the mixing valve 32 so as to reach the hot water supply set temperature and supplied to the hot water supply location.

  When the temperature detected by the upper thermistor 36 of the tank 30 is lower than the hot water supply set temperature, the controller permits the combustion operation of the burner 80 and the temperature detected by the mixed thermistor 64 is slightly lower than the hot water supply set temperature. The opening of the mixing valve 32 is adjusted so that the temperature is low. In this case, the hot water supplied from the upper part of the tank 30 and the low-temperature tap water supplied from the water supply path are mixed in the mixing valve 32, and then heated to the hot water supply set temperature by the burner 80. Supplied to.

  In the hot water supply system 2 of the present embodiment, for example, when the water amount (hot water supply amount) obtained by adding the water amount detected by the water side water amount sensor 54 and the water amount detected by the hot water amount sensor 60 is below a predetermined value, It is determined that the hot water supply has been completed. When the hot water supply ends, the controller prohibits the combustion operation of the burner 80 and ends the hot water supply operation process.

  FIG. 2 shows the external appearance of the remote controller 76. The remote control 76 includes a display panel 102. The display panel 102 is a liquid crystal panel, for example. The display panel 102 can display the system state such as the current time, the set temperature of hot water (for example, the set temperature of hot water supply), the amount of hot water stored in the tank 30, and the like. In the hot water supply system 2 of the present embodiment, the hot water storage amount of the tank 30 is displayed by the hot water storage icon 104. The hot water storage icon 104 includes an upper indicator 110, an intermediate indicator 112 disposed immediately below the upper indicator 110, a lower indicator 114 disposed directly below the intermediate indicator 112, an upper indicator 110, an intermediate indicator 112, and a lower portion. A frame 116 surrounding the indicator 114 is provided.

  The upper indicator 110 is turned on when the temperature detected by the lower thermistor of the tank 30 is 38 ° C. or higher. The upper indicator 110 is turned off when the temperature detected by the lower thermistor of the tank 30 is less than 36 ° C. during lighting. That is, the lighting of the upper indicator 110 means that the amount of hot water stored in the tank 30 is 30 liters or more.

  The intermediate indicator 112 is turned on when the temperature detected by the intermediate thermistor of the tank 30 is 38 ° C. or higher when the light is turned off. Further, the intermediate indicator 112 is turned off when the temperature detected by the intermediate thermistor of the tank 30 is less than 36 ° C. during lighting. In other words, the lighting of the intermediate section indicator 112 means that the amount of hot water stored in the tank 30 is 12 liters or more.

  The lower indicator 114 is turned on when the detected temperature of the upper thermistor of the tank 30 is 38 ° C. or higher when the light is turned off. The lower indicator 114 is turned off when the temperature detected by the upper thermistor of the tank 30 is less than 36 ° C. during lighting. That is, lighting of the lower indicator 114 means that the amount of hot water stored in the tank 30 is 6 liters or more.

  The frame 116 is always lit regardless of the display state of the upper indicator 110, the middle indicator 112, and the lower indicator 114.

  In the hot water supply system 2 of the present embodiment, the display form of the hot water storage icon 104 differs depending on whether the temperature detected by the upper thermistor 36 is equal to or higher than the reference temperature and when the temperature detected by the upper thermistor 36 is lower than the reference temperature. Shall. The reference temperature is specified based on the hot water supply set temperature. The reference temperature may be, for example, the hot water supply set temperature itself, or may be a temperature obtained by adding a predetermined temperature (for example, 2 ° C.) to the hot water supply set temperature. If the temperature detected by the upper thermistor 36 is equal to or higher than the reference temperature, it is possible to supply hot water at the hot water supply set temperature for the time being without performing the combustion operation of the burner 80. On the contrary, if the temperature detected by the upper thermistor 36 is lower than the reference temperature, the burner 80 needs to be burned in order to perform hot water supply at the hot water supply set temperature. Therefore, in the hot water supply system 2 of the present embodiment, when the temperature detected by the upper thermistor 36 is equal to or higher than the reference temperature, the hot water storage icon 104 is displayed in the first display mode, and the temperature detected by the upper thermistor 36 is the reference. When the temperature is lower than the temperature, the hot water storage icon 104 is displayed in the second display mode. Thereby, the user can grasp from the display mode of the hot water storage icon 104 whether the hot water supply system 2 can supply hot water without performing the combustion operation of the burner 80.

  As a display mode of the hot water storage icon 104, for example, in the first display mode, the brightness or concentration when the upper indicator 110, the middle unit indicator 112, and the lower indicator 114 are turned on is increased, and in the second display mode, the upper indicator 110 is displayed. The brightness or density when the middle indicator 112 and the lower indicator 114 are turned on may be lowered. FIGS. 3A to 3H illustrate display modes of the hot water storage icon 104 in this case. (A), (b), (c) and (d) of FIG. 3 show the display mode (first display mode) of the hot water storage icon 104 when the temperature detected by the upper thermistor 36 is equal to or higher than the reference temperature. ing. (A) of FIG. 3 has shown the case where the amount of hot water storage of the tank 30 is 30 liters or more, and the upper indicator 110, the intermediate | middle part indicator 112, and the lower indicator 114 are lighting. FIG. 3B shows a case where the amount of stored hot water in the tank 30 is 12 liters or more and less than 30 liters, the upper indicator 110 is turned off, and the middle indicator 112 and the lower indicator 114 are turned on. FIG. 3C shows a case where the amount of hot water stored in the tank 30 is 6 liters or more and less than 12 liters, the upper indicator 110 and the intermediate indicator 112 are turned off, and the lower indicator 114 is turned on. (D) of FIG. 3 has shown the case where the amount of hot water storage of the tank 30 is less than 6 liters, and the upper indicator 110, the intermediate | middle part indicator 112, and the lower indicator 114 are light-extinguished. (E), (f), (g) and (h) of FIG. 3 show the display mode (second display mode) of the hot water storage icon 104 when the temperature detected by the upper thermistor 36 is lower than the reference temperature. ing. The amount of hot water stored in the tank 30 in (e), (f), (g) and (h) of FIG. 3 is the amount of hot water stored in the tank 30 in (a), (b), (c) and (d) of FIG. Is the same.

  Alternatively, if the display panel 102 can perform color display, the hot water storage icon 104 is displayed in a warm color (for example, red) when the upper indicator 110, the intermediate indicator 112, and the lower indicator 114 are lit in the first display mode. In the second display mode, the upper indicator 110, the middle indicator 112, and the lower indicator 114 may be displayed in a cool color (for example, blue) when the indicator is turned on.

  Alternatively, as shown in FIG. 4A, in the first display mode, the frame line 116 is displayed as a solid line, and as shown in FIG. 4B, the frame line 116 is displayed in the second display mode. May be displayed by a broken line.

  Alternatively, as shown in FIG. 5A, in the first display mode, a character string “high temperature hot water” is displayed in the vicinity of the frame line 116, and as shown in FIG. In the display mode, a character string “low temperature hot water storage” may be displayed near the frame line 116.

  In the hot water supply operation, the combustion operation of the burner 80 may be started even when the temperature detected by the upper thermistor 36 of the tank 30 is equal to or higher than the reference temperature. If the combustion operation of the burner 80 is started after the hot water in the tank 30 has been used up, and the piping group of the burner unit 8 has cooled down, the hot water supply temperature temporarily decreases. In order to cope with this, the combustion operation of the burner 80 is started from the point in time when still hot water remains in the tank 30, and the piping group of the burner unit 8 is heated with the hot water from the tank 30. It is possible to prevent a drop in hot water supply temperature when 30 hot water runs out. Alternatively, when a certain amount of time has elapsed since the previous hot water supply operation, it is assumed that the piping group of the burner unit 8 has cooled, so even if the temperature of hot water that can be supplied from the tank 30 is equal to or higher than the reference temperature If the combustion operation of the burner 80 is started, the piping group of the burner unit 8 can be warmed with hot water from the tank 30. When performing such an operation, even if the temperature detected by the upper thermistor 36 of the tank 30 is equal to or higher than the reference temperature, if the condition for starting the combustion operation of the burner 80 is satisfied, the hot water storage icon 104 is displayed. You may display by the display mode (namely, 2nd display mode) similar to the case where the temperature detected by the upper thermistor 36 of the tank 30 is less than reference temperature.

  For example, in the hot water supply operation, when the amount of hot water stored in the tank 30 is smaller than the reference hot water amount (for example, 12 liters), or when the elapsed time from the end of the previous hot water supply operation exceeds the reference time (for example, 20 minutes), Even if the temperature detected by the thermistor 36 is equal to or higher than the reference temperature, the combustion operation of the burner 80 may be started. In such a case, when the amount of hot water stored in the tank 30 is smaller than the reference hot water amount, or when the elapsed time from the end of the previous hot water supply operation exceeds the reference time, the temperature detected by the upper thermistor 36 is the reference. Even when the temperature is higher than the temperature, the hot water storage icon 104 is displayed in the second display mode. By setting it as such a structure, the necessity of the combustion operation of the burner 80 can be correctly reflected on the display mode of the hot water storage icon 104. FIG.

  In the above case, the reference hot water amount and the reference time may be changed according to the environmental temperature of the hot water supply system 2. The ambient temperature here may be, for example, the outside air temperature detected by the outside air temperature thermistor 23 or the water supply temperature detected by the incoming water thermistor 44. For example, when the environmental temperature is lower than a predetermined temperature (for example, 5 ° C.), the reference amount of hot water is set to a larger amount (for example, 30 liters) and / or the reference time is set to a shorter time (for example, 10 minutes). The combustion operation of the burner 80 is started at an appropriate timing. In such a case, by specifying the display mode of the hot water storage icon 104 based on the reference hot water amount and / or the reference time changed according to the environmental temperature, whether the combustion operation of the burner 80 is necessary or not can be determined. It can be accurately reflected in the display mode.

  As described above, the hot water supply system 2 of the above embodiment includes the HP unit 4 (corresponding to the first heating source) for heating hot water, the tank 30 for storing hot water heated by the HP unit 4, and the tank 30. An upper thermistor 36 (corresponding to hot water temperature acquisition means) that acquires the temperature of hot water that can be supplied from the tank, a burner unit 8 (corresponding to a second heating source) that heats hot water sent from the tank 30 to the hot water supply location, and a tank A remote controller 76 (corresponding to a display device) for displaying a system state including the amount of hot water storage is provided. In this hot water supply system 2, when the temperature of hot water that can be supplied from the tank 30 is higher than the reference temperature based on the hot water supply set temperature, the remote controller 76 displays the system state in the first display mode and can be supplied from the tank 30. When the temperature is lower than the reference temperature, the remote controller 76 displays the system state in the second display mode.

  In the hot water supply system 2 of the above embodiment, when the amount of hot water stored in the tank is smaller than the reference amount of hot water, even if the temperature of the hot water that can be supplied from the tank 30 is higher than the reference temperature, the remote controller 76 changes the system state to the second state. It can comprise so that it may display in the display mode.

  In the hot water supply system 2 of the above embodiment, when the elapsed time from the end of the previous hot water supply exceeds the reference time, even if the temperature of hot water that can be supplied from the tank 30 is higher than the reference temperature, the remote controller 76 is The state can be configured to be displayed in the second display mode.

  The hot water supply system 2 of the above-described embodiment includes an outside air temperature thermistor 23 (corresponding to the environmental temperature acquisition means) that acquires the outdoor air temperature (corresponding to the environmental temperature), and water that acquires the water supply temperature (corresponding to the environmental temperature). The thermistor 44 (corresponding to the environmental temperature acquisition means) is further provided, and the reference hot water amount and / or the reference time can be changed according to the outside air temperature or the feed water temperature.

  Each embodiment has been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2 Hot-water supply system 4 HP unit 6 Tank unit 8 Burner unit 10 Compressor 12 Condenser 14 Expansion valve 16 Evaporator 18 Circulating pump 20 Return thermistor 22 Forward thermistor 23 Outside temperature thermistor 24 HP controller 30 Tank 32 Mixing valve 34 Bypass control valve 36 Upper thermistor 37 Middle thermistor 38 Lower thermistor 40 Water supply path 42 Pressure reducing valve 44 Water supply thermistor 46 Tank water supply path 48 Tank bypass path 50, 52 Check valve 54 Water side water amount sensor 56 Tank outlet water path 58 Check valve 60 Hot water side water amount sensor 62 First hot water supply path 64 Mixed thermistor 66 Second hot water supply path 68 Hot water supply outlet thermistor 70 Check valve 72 Hot water supply bypass path 74 Tank controller 76 Remote controller 80 Burner 82 Heat exchanger 84 Bypass servo 86 Water quantity servo 8 Yu beams valve 90 burner forward 92 burner backward 94 burner bypass path 96 burner hot water thermistor 98 hot beam path 100 burner controller 102 display panel 104 hot water storage icon 110 upper indicator 112 middle section indicator 114 lower indicator 116 Borders

Claims (4)

A first heating source for heating hot water;
A tank for storing hot water heated by a first heating source;
Hot water temperature acquisition means for acquiring the temperature of hot water that can be supplied from the tank;
A second heating source for heating hot water sent from the tank to the hot water supply location;
A hot water supply system including a display device that displays a system state including a tank hot water storage amount,
When the temperature of hot water that can be supplied from the tank is higher than the reference temperature based on the hot water set temperature, the display device can supply hot water at the hot water set temperature without heating the system state by the second heating source. When the temperature of the hot water that can be supplied from the tank is lower than the reference temperature, the display device uses the second heating source to supply hot water at the hot water set temperature. Display in the second display mode indicating that heating is required ,
A hot water supply system in which the display device displays the system state in the second display mode even when the temperature of hot water that can be supplied from the tank is higher than the reference temperature when the amount of hot water stored in the tank is smaller than the reference amount of hot water. When the elapsed time from the end of the previous hot water supply exceeds the reference time, even if the temperature of hot water that can be supplied from the tank is higher than the reference temperature, the display device displays the system state in the second display mode. The hot water supply system according to claim 1. A first heating source for heating hot water;
A tank for storing hot water heated by a first heating source;
Hot water temperature acquisition means for acquiring the temperature of hot water that can be supplied from the tank;
A second heating source for heating hot water sent from the tank to the hot water supply location;
A hot water supply system including a display device that displays a system state including a tank hot water storage amount,
When the temperature of hot water that can be supplied from the tank is higher than the reference temperature based on the hot water set temperature, the display device can supply hot water at the hot water set temperature without heating the system state by the second heating source. When the temperature of the hot water that can be supplied from the tank is lower than the reference temperature, the display device uses the second heating source to supply hot water at the hot water set temperature. Display in the second display mode indicating that heating is required,
When the elapsed time from the end of the previous hot water supply exceeds the reference time, even if the temperature of hot water that can be supplied from the tank is higher than the reference temperature, the display device displays the system state in the second display mode. Hot water system. It further includes an environmental temperature acquisition means for acquiring the environmental temperature,
The hot water supply system according to any one of claims 1 to 3, wherein the reference hot water amount and / or the reference time is changed according to the environmental temperature.

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