JP5831198B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type water heater.

  The conventional hot water storage type water heater is a means for displaying the amount of hot water in the hot water storage tank (remaining hot water amount). The detected temperature detected by a plurality of temperature sensors for detecting the hot water temperature in the hot water storage tank is between the lower limit temperature and the upper limit temperature. It is determined whether the temperature is lower than the upper limit temperature, and each detected temperature is displayed for each temperature sensor installation position (Patent Document 1) or the product of the detected temperature of a plurality of temperature sensors and the installation position interval is calculated. On the other hand, the amount of heat stored in the hot water is calculated from the heating capacity and the lifting time, the amount of heat consumed from the hot water storage tank is calculated, and the amount of heat added to or subtracted from the amount of stored hot water is converted into a standard operating temperature and displayed (Patent Document 2) ), A means for comparing and displaying the maximum amount that can be stored in the hot water storage tank and the amount of remaining hot water, and a means for comparing and displaying the target amount of stored heat and the amount of remaining hot water that are to be stored by lifting, That so as not to worry Les (Patent Document 3).

Japanese Utility Model Publication No. 4-50353 JP 2007-211997 JP 2010-84959 A

  However, in the above-described conventional technology, when the amount of remaining hot water changes due to operations other than the equipment that can be recognized by the user, such as raising and hot water supply, for example, when the temperature sensor reading decreases due to heat dissipation from the hot water storage tank to the outside air, The display of the remaining hot water amount is changed in accordance with the change of the sensor reading value, and the user feels uncomfortable that the hot water amount changes even though the device is not operated.

  The present invention has been made to solve this problem, and an object of the present invention is to provide a hot water storage type hot water heater that does not give the user a sense of incongruity.

A hot water storage tank, a plurality of remaining hot water temperature sensors for detecting the temperature of hot water in the hot water storage tank, a remaining hot water amount calculating means for calculating the remaining hot water amount in the hot water storage tank from the detected value of the remaining hot water temperature sensor, and a remaining hot water amount calculating means A hot water storage type water heater provided with a remaining hot water amount display means for displaying the calculation result of the remaining hot water amount, and the remaining hot water amount calculation means determines that there is remaining hot water when the detected value of the remaining hot water amount sensor is higher than a predetermined threshold value. A first determination criterion and a second determination criterion that determines that there is remaining hot water when the detected value of the remaining hot water amount sensor is higher than a second threshold value that is higher than a predetermined threshold value . An operation state display unit that displays the operation state is provided, and if the amount of hot water in the hot water storage tank changes due to the user's operation or the use of a hot water storage type water heater, the operation state display unit displays the operation state. Is displayed on the remaining hot water amount calculation means. The operation of that remaining hot water, is to use a first criterion.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage type hot water supply machine which does not feel discomfort to a user can be provided.

It is a circuit block diagram of the hot water storage type water heater by Embodiment 1 of this invention. It is an electrical block diagram of the hot water storage type water heater by Embodiment 1 of this invention. It is a block diagram of the remote control by Embodiment 1 of this invention. It is a figure which shows the relationship between the remaining hot water display by Embodiment 1 of this invention, and the detection state of a remaining hot water temperature sensor. It is a figure explaining the hot water determination criteria by Embodiment 1 of this invention. It is a figure which shows the criteria switching conditions by Embodiment 1 of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a hot water storage type water heater of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below.

Embodiment 1 FIG.
FIG. 1 is a schematic view showing an example of a hot water storage type hot water supply apparatus of the present invention. The hot water storage type water heater 100 shown in the figure has a function of boiling low-temperature water such as city water into hot water with a heat source machine and supplying hot water to a desired location, and filling bath water in the bathtub 15 to add the bath water. The heat pump unit 1, the tank unit 2, and the control unit 45 are provided. Hereinafter, each component of the hot water storage type water heater 100 will be described.

  The heat pump unit 1 is configured in a heat pump unit case 8 by a compressor 3 for compressing a refrigerant, a radiator 4, an expansion valve 5, an evaporator 6, and a refrigerant pipe 7 that connects these in an annular shape. It has a refrigeration cycle system and functions as a heat source machine. In the above refrigeration cycle system, a refrigerant such as carbon dioxide is compressed by the compressor 3 to become high temperature and high pressure, and then radiates heat by the radiator 4, is decompressed by the expansion valve 5, and absorbs heat by the evaporator 6 to be in a gas state. And is sucked into the compressor 3. On the other hand, the tank unit 2 includes a hot water storage tank 10, a water supply line 30, a hot water circulation line 40, a hot water supply line 50, a primary side circulation line 60, a secondary side circulation line 70, and a bath heat exchanger 11. have.

  The hot water storage tank 10 is a stacked hot water storage tank that stores low-temperature water supplied from the water supply pipe 30 and also stores hot water boiled by the heat pump unit 1. Below the hot water storage tank 10, a water introduction port to which the water supply pipe 30 is connected and a water outlet port to which the pipe 20 of the hot water circulation pipe 40 is connected are provided. The upper part is provided with a hot water inlet port to which the pipe 21 of the hot water storage circulation line 40 is connected and a hot water outlet port to which the hot water supply pipe line 50 is connected. The hot water storage tank 10 is always kept full. One or more remaining hot water temperature sensors are provided on the surface of the hot water storage tank 10. Here, the remaining hot water temperature sensor 10 a, the remaining hot water temperature sensor 10 b, the remaining hot water temperature sensor 10 c, and the remaining hot water temperature sensor 10 d are positioned at every predetermined capacity of the hot water storage tank 10 from the top to the bottom of the hot water storage tank 10. The detected temperature is used for calculating the remaining hot water amount. In addition, a relief valve 29 is provided at the upper part of the hot water storage tank 10 to allow the hot water to escape from the system in order to relieve the pressure increase due to the expansion of the hot water heated by the side.

  The water supply pipe 30 is a pipe that supplies low-temperature water such as city water to the hot water storage tank 10, the hot water supply pipe 50, and a predetermined hot water supply destination, and the first to third water supply pipe sections 30 a to 30 c and the pressure reducing valve 25. have. The first water supply pipe section 30a connects a water source such as a water supply and a water inlet at the lower part of the hot water storage tank 10, and the second water supply pipe section 30b branches from the first water supply pipe section 30a to be described later with the first water supply pipe section 30a. The hot water mixing valve 23 and the bath mixing valve 24 are connected to each other, and the third water supply pipe portion 30c is branched from the first water supply pipe portion 30a to connect the first water supply pipe portion 30a and a predetermined hot water supply destination. In the illustrated example, one hot water supply port 27 is shown as an example of a hot water supply destination. The pressure reducing valve 25 is provided on the downstream side of the branch point of the third water supply pipe part 30c in the first water supply pipe part 30a, and reduces the water source water pressure to be equal to or lower than a predetermined value. In FIG. 1, the flow direction of the low-temperature water in the water supply pipeline 30 is indicated by a solid line arrow.

  The hot water storage circulation line 40 is a pipe line that reaches from the water outlet port of the hot water storage tank 10 to the hot water inlet port of the hot water storage tank 10 via the radiator 4 in the heat pump unit 1. A drain plug 80 that can be switched to a path on the side of the drain pipe 81 for discharging to the pipe, a pipe 20 provided with the side pump 19 in this order, a pipe 21 provided with a hot water switching valve 22, and a hot water switching valve 22 and a bypass pipe 21 a having one end connected to the lower portion of the hot water storage tank 10 and the other end connected to the lower portion of the hot water storage tank 10. The pipe 20 connects the water outlet and the radiator 4, and the pipe 21 connects the radiator 4 and the hot water inlet. During the freeze prevention operation, water flowing into the pipe 20 from the hot water storage tank 10 passes through the radiator 4 and the pipe 21 and then flows through the bypass pipe 21a to the lower part of the hot water storage tank 1 again. In order to enable a boiling operation for boiling hot water with the radiator 4 and the above-described freeze-preventing operation, a lifting pump 19 is provided upstream of the hot water switching valve 22 in the pipe 21.

  The hot water supply pipe 50 mixes the hot water stored in the hot water storage tank 10 and the low temperature water from the water supply pipe 30 with the hot water mixing valve 23 or the bath mixing valve 24 to obtain hot water at a predetermined temperature. Or a predetermined hot water supply destination, in the example shown in the figure, a pipe that supplies water to the hot water supply port 27. In addition to the hot water mixing valve 23 and the bath mixing valve 24, there are first to third hot water supply pipe portions 50a to 50c. ing. The first hot water supply pipe section 50a connects the hot water outlet port at the upper part of the hot water storage tank 10 to the hot water and bath mixing valves 23, 24, and the second hot water pipe section 50b is connected to the bath mixing valve 24 and the secondary circulation circuit. 70, the third hot water supply pipe portion 50 c connects the hot water supply mixing valve 23 and the hot water supply port 27. The second hot water supply pipe section 50b is provided with a hot water supply solenoid valve 44 that opens and closes the path to the bathtub 15 side, and a bath flow sensor 41 that detects the flow rate of hot water inside. Further, the third hot water supply pipe section 50c is provided with a hot water supply flow rate sensor 28, which can detect the flow rate of flowing hot water.

  The primary-side circulation pipe 60 is a pipe that reaches the lower part of the hot water storage tank 10 from the hot water outlet of the upper part of the hot water storage tank 10 through the heat exchanger 11 for bathing, and is provided with a pipe 12 and a heat source pump 13. Piping 14. The pipe 12 connects the hot water outlet of the hot water storage tank 10 and the heat source side inlet 111 above the bath heat exchanger 11, and the pipe 14 connects the heat source side outlet 112 below the bath heat exchanger 11 and the lower part of the hot water tank 10. Connect. In the illustrated example, a predetermined section on the hot water storage tank 10 side in the first hot water supply pipe section 50a also serves as a section on the hot water storage tank 10 side in the pipe 12.

  The secondary circulation pipe 70 is a pipe that returns from the bathtub 15 to the bathtub 15 again via the bath heat exchanger 11, and includes a bath return pipe 17 provided with a bath pump 16, a bath going pipe 18, and the like. have. The bath return pipe 17 connects the bathtub 15 and the bath side inlet 113 at the bottom of the bath heat exchanger 11, and the bath return pipe 18 connects the bath side outlet 114 at the upper portion of the bath heat exchanger 11 and the bathtub 15. The return pipe 17 is provided with a flow switch 47 that detects the presence or absence of an internal flow and a water level sensor 39 that detects the water pressure in the bathtub and detects the water level in the bathtub.

  The bath heat exchanger 11 heats the bath water by exchanging heat between the hot water flowing through the primary-side circulation pipe 60 and the bath water flowing through the secondary-side circulation pipe 70. Among the above-described constituent members constituting the tank unit 2, a part of each of the water supply pipe 30, the hot water storage circulation pipe 40, the hot water supply pipe 50, and the secondary side circulation pipe 70 is a tank unit case 9. The remaining components are housed in the tank unit case 9.

  As control means for controlling the hot water storage water heater 100, there are a control unit 45 disposed in the tank unit case 9 and a remote controller 46 disposed in the kitchen, bathroom, etc. and wired or wirelessly connected to the control unit 45. doing. The control unit 45 is connected to the heat pump unit 1, the hot water switching valve 22, the side pump 19, the bath mixing valve 24, the hot water mixing valve 23, the heat source pump 13, and the bath pump 16, and serves as an input device for the control unit 45. These operations are controlled in accordance with information and commands input by the user from the functioning remote controller 46.

  FIG. 2 is an electrical configuration diagram of the hot water storage type hot water heater according to Embodiment 1 of the present invention. The control unit 45 receives electrical signals from the remaining hot water temperature sensors 10a, 10b, 10c, and 10d, the hot water flow sensor 28, the bath flow sensor 41, the flow switch 47, and the water level sensor 39, and sets the physical property values. Convert. Further, the control unit 45 transmits an electrical signal to the hot water mixing valve 23, the bath hot water mixing valve 24, the bath hot water solenoid valve 44, the side pump 19, the bath pump 16, and the heat source pump 13. Each part is driven. The control unit 45 is connected to the remote controller 46 through an electric communication line, and transmits / receives information to / from each other.

FIG. 3 is a configuration diagram of a remote controller of the hot water storage type hot water heater according to Embodiment 1 of the present invention.
The remote controller 46 includes a display unit 461 that displays various setting states corresponding to the user's operation, operation information generated by the operation, a bath automatic button 464 for instructing filling of the bathtub 15, and the bathtub 15 A chasing button 465 for chasing the bath water inside, a hot water supply temperature setting button for setting the temperature of hot water discharged to the hot water outlet 27, etc., although not shown, are provided. Further, the display unit 461 includes a remaining hot water amount display unit 462 that displays the remaining hot water amount information of the hot water storage tank 10 and an operation display unit 463 that displays an operation state of the hot water storage type water heater 100. Display according to the information received.

  Accordingly, the hot water storage type hot water heater 100 operates based on the above-described information, instructions, etc. input by the user from the remote controller 46. For example, when the boiling start time input by the user from the remote controller 46 is reached, the heat pump unit 1 and the side pump 19 are activated under the control of the control unit 45 to start the boiling operation and are provided in the hot water storage tank 10. This is continued until it is determined from the detection results of the remaining hot water temperature sensors 10a to 10d that a predetermined amount of hot water at a predetermined temperature is stored in the hot water storage tank 10. During this time, low-temperature water flows from the water outlet port at the bottom of the hot water storage tank 10 into the hot water storage circulation line 40, boiled into hot water by the heat pump unit 1, and returned to the hot water storage tank 10 from the hot water inlet at the top of the hot water storage tank 10. . In addition, it may be displayed on the operation display unit 463 that the lifting operation is being performed.

  Further, when the user opens the hot water supply port 27, the water pressure is released, hot water from the hot water storage tank 10 and water from the pressure reducing valve 25 side are supplied to the hot water supply mixing valve 23, respectively, at a ratio according to the opening of the valve. The mixed hot water is supplied to the hot water supply port 27 through the third hot water supply pipe portion 50c. When the hot water supply flow rate sensor 28 detects a predetermined flow rate, the operation display unit 463 displays that the hot water supply operation is being performed. Alternatively, it may be displayed that hot water is being consumed.

  Further, when the user inputs a hot water operation start command from the remote controller 46, the bath water heater electromagnetic valve 44 provided in the second hot water supply pipe section 50b opens under the control of the control section 45, and the second hot water supply pipe section 50b. The hot water supply mixing valve 24 is controlled so that the detected hot water temperature of a temperature sensor (not shown) provided at the temperature becomes the hot water temperature preset by the user from the remote controller 46. Thereby, supply of the bath water to the bathtub 15 is started via the secondary side circulation circuit 70 from the second hot water supply pipe portion 50b. In the hot water operation, for example, when it is determined that the amount of bath water in the bathtub 15 has reached a predetermined amount from the detection result of the flow sensor 41 for the hot water provided in the second hot water supply pipe section 50b, the hot water hot water solenoid valve 44 is used. Close and exit. When the bath flow sensor 41 detects a predetermined flow rate, the operation display unit 463 displays that the bath hot water supply operation is in progress. Alternatively, it may be displayed that hot water is being consumed. In addition, it may be displayed that the hot water supply operation is being performed while the hot water supply solenoid valve 44 is open, regardless of the output of the flow sensor 41 for the hot water supply.

  In addition, when the user inputs a follow-up operation start command from the remote controller 46, the heat source pump 13 and the bottom pump 16 are activated under the control of the control unit 45, and the follow-up operation is started. This chasing operation is continued until it is determined, for example, that the bath water in the bathtub 15 has been heated to a predetermined temperature from the detection result of a temperature sensor (not shown) disposed in the bath return pipe 17. When the chasing function is activated, it may be displayed on the operation display unit 463 that the chasing operation is being performed or hot water is being consumed.

  In addition, with the water supply from the water supply line 30 stopped with a stopcock (not shown) or the like, the relief valve 29 is opened, and the drainage valve 80 is opened to the side where the drainage pipe 81 communicates, thereby sucking in the air from the relief valve 29. The hot water in the hot water storage tank 10 is drained to the outside through the drain pipe 31 via the pipe 20.

  Next, information of the remaining hot water amount displayed on the remaining hot water amount display unit 462 by the remote controller 46, which is a main part of the present invention, will be described. As a criterion for judging whether the hot water stored in the hot water storage tank 10 is hot water (residual hot water) or not, hot water having a temperature of hot water supply, for example, 45 ° C. or higher is defined as residual hot water. Is the amount of remaining hot water. At the position of each remaining hot water temperature sensor, if it is 45 ° C. or higher, hot water is used, and if it is lower, water is used. If this is used as a criterion, detection of the remaining hot water temperature sensor is performed as shown in the remaining hot water amount display column of FIG. Corresponding to the result, it is displayed as a picture having a scale on the remaining hot water display section 462. Since the hot water is stacked as a high temperature water layer from the upper part of the hot water storage tank 10, the temperature detected from the remaining hot water temperature sensors attached to a higher position, that is, the hot water temperature sensor 10 a in order from the hot water temperature sensor 10 a. It is possible to know how much hot water occupies from the upper part of the hot water storage tank 10.

  Next, the concept of hot water determination criteria for displaying the remaining hot water amount performed by the control unit 45 will be described. As shown in the first criterion of FIG. 5, the hot water threshold temperature, for example, the vicinity of 45 ° C. described above is detected from the first hot water lower limit temperature and the first water upper limit temperature with respect to the detected temperature of each remaining hot water temperature sensor. It is set as a judgment standard having a hysteresis. For example, when the current reading value of a remaining hot water temperature sensor is 44 ° C and water is determined, water is determined when the next reading value is 45 ° C, and hot water is determined when the next reading value is 46 ° C. The determination is changed to hot water, and the range moves to the upper range in FIG. Thereafter, for example, when the next reading is 45 ° C., the hot water remains, but when the next reading becomes 44 ° C., the range moves to the lower side of FIG. 5 and the determination is water.

  A main condition for increasing the detected temperature of each remaining hot water temperature sensor is when hot water is supplied to the hot water storage tank 10 by lifting up. As the high-temperature water layer in the hot water storage tank 10 increases, the water determination is changed to the hot water determination in the order of the remaining hot water temperature sensor 10a to the remaining hot water temperature sensor 10d. On the other hand, the main conditions for decreasing the temperature detected by each remaining hot water temperature sensor include the case where hot water is consumed due to hot water coming out of the hot water supply port 27, filling of the hot water to the bathtub 15 or chasing. As the hot water layer in the hot water storage tank 10 decreases, the hot water determination changes to the water determination in the order of the remaining hot water temperature sensor 10d to the remaining hot water temperature sensor 10a. Regardless of which means are used, the user is expected to perform an operation that is actively operated, or that the user sets in advance with the remote controller 46 or the like and that the hot water storage hot water heater 100 (device side) automatically performs. Therefore, the change in the remaining hot water display is accepted as a reasonable phenomenon by the user.

  On the other hand, examples of the case where the detected temperature of each remaining hot water temperature sensor decreases include the following cases that the user cannot recognize. One is a decrease in the remaining hot water temperature in the hot water storage tank due to natural heat dissipation from the hot water storage tank 10 to the outside air. In this case, the user may recognize that “the amount of remaining hot water has decreased even though hot water is not used” and may lead to dissatisfaction. In addition, it is possible to apply a state in which the device is automatically operated for the purpose of protecting the hot water storage type water heater without depending on the user's operation, does not indicate that the device is in an operating state, and no hot water is supplied. For example, in order to prevent freezing of the hot water storage circulation line 40, the primary side circulation line 60, the secondary side circulation line 70, etc., the side pump 19, the bath pump 16, and the heat source pump 13 are driven to move inside the hot water storage tank 10. The anti-freezing operation for transferring the heat of the hot water to the piping and the heat pump 4 is driven to prevent the scale component in the water from precipitating by leaving the radiator 4 that has become hot after the pump is left. For example, scale preventive operation for cooling. Also for these operations, it is difficult for the user to recognize using hot water, which may lead to dissatisfaction as well.

  Therefore, during the above-described event that cannot be recognized by the user, the hot water determination is performed according to the second determination criterion of FIG. The second determination criterion in FIG. 5 sets the second hot water lower limit temperature to a temperature equal to or lower than the first hot water lower limit temperature in the first determination criterion described above, and a temperature equal to or higher than the first water upper limit criterion. The 2nd water upper limit temperature is set up so that it may become. In this way, the determination with the hysteresis having the hot water threshold temperature, for example, 34 ° C. as the second hot water lower limit temperature and 56 ° C. as the second upper water temperature is performed for the detected temperature of each remaining hot water temperature sensor. Here, the second hot water lower limit temperature is set to a value not higher than the first hot water lower limit temperature (for example, 34 ° C.). As for this value, it is preferable that the display of the remaining hot water amount does not change. For example, a temperature (for example, 10K) that decreases due to heat dissipation that occurs in an actual machine or hot water consumption by automatic operation is grasped in advance, and the first hot water lower limit temperature is determined. It is good to set it as the subtracted value (44-10 = 34 degreeC). The second water upper limit temperature is set to a value equal to or higher than the first water upper limit temperature (for example, 56 ° C.). As with the method for determining the second hot water lower limit temperature, it is preferable to set a temperature at which the remaining hot water display is preferably not changed. When it is assumed that there is an operation of reducing the amount of remaining hot water that cannot be recognized by the user and there is no operation of increasing, the second water upper limit temperature may be set equal to the first water upper limit temperature. When it is assumed that there is an operation of increasing the amount of remaining hot water that cannot be recognized by the user and there is no operation of decreasing, the second hot water lower limit temperature may be set equal to the first hot water lower limit temperature.

  The operation based on the criterion will be described with a specific example. For example, when the second criterion is selected and the current reading is determined to be hot water at 45 ° C., the heat from the hot water storage tank 10 is used. It is assumed that the remaining hot water temperature gradually decreases to 35 ° C. When the remaining hot water temperature sensor reading is 44 ° C., determination is not made based on the first hot water lower limit temperature, so hot water is continued at 43 ° C. When it exceeds the assumption of heat dissipation and falls to 34 ° C., it is determined as water and the remaining hot water display changes.

  Further, the control unit 45 displays the remaining hot water amount display unit 462 using the remaining hot water amount calculation based on the first determination criterion and the second determination criterion, depending on the situation. That is, when the user changes the amount of hot water in the hot water storage tank 10 by the user using a hot water storage water heater such as hot water filling or reheating, or the use of hot water, the operation display unit 463 performs the operation. In addition to displaying the state, the control unit 45 shifts to a mode of displaying the remaining hot water amount display unit 462 using the first determination criterion in the calculation of the remaining hot water amount, and conversely, the hot water storage type hot water heater 100 is in the hot water storage tank 10. When the operation related to the increase / decrease in hot water is not being performed, the control unit 45 performs control so as to shift to a mode in which the remaining hot water amount is displayed using the second determination criterion. Further, the control unit 45 operates a function (described above) that moves regardless of (or cannot be recognized by) the user's operation while shifting to a mode in which the remaining hot water amount is displayed using the second determination criterion. In some cases, the remaining hot water amount may be displayed while using the second determination criterion. As a result, during the operation that can be recognized by the user, the remaining hot water amount display changes appropriately according to the first criterion, and after these operations are completed, the above heat dissipation, freezing prevention means, and scale prevention means have occurred. In this case, since the display is switched to the second determination criterion, the remaining hot water amount display does not change even when the temperature falls below the first hot water lower limit temperature, and the remaining hot water amount display change that makes the user feel uncomfortable can be suppressed.

  In addition, even if the user does not perform operations related to the use of hot water for a long time, if heat is not raised for a long time (the hot water in the hot water storage tank does not increase), heat is radiated from the hot water in the hot water storage tank to the outside air. The fact that the amount of heat of the hot water in the hot water storage tank continues to become water that cannot be used for hot water supply is often accepted as a natural phenomenon for the user. On the other hand, even when it is the second determination criterion, the remaining hot water amount may change so as to shift to the first determination criterion and display the remaining hot water amount according to the temperature sensor reading. According to this, a change in the remaining hot water amount display due to a decrease in the reading value of the remaining hot water temperature sensor due to a decrease in the temperature inside the hot water storage tank 10 as heat radiation continues is received as a reasonable change for the user without a sense of incongruity.

  If the remaining hot water amount in the hot water storage tank 10 does not change for a predetermined time, the control unit 45 shifts to a mode for determining the remaining hot water amount using the second determination criterion, and the hot water storage tank 10 according to the second determination criterion. When a change in the remaining hot water amount is detected, the mode may be shifted to a mode for determining the remaining hot water amount using the first determination criterion. According to this, when a user drains a large amount of hot water in the hot water storage tank 10 by operating the relief valve 29 or the drain valve 30, the remaining hot water amount is displayed according to the second criterion. However, since the remaining hot water amount changes greatly, the reading value of the remaining hot water temperature sensor changes and the remaining hot water amount is displayed accordingly. It is received as a reasonable change without a sense of incongruity.

  In the above-described first embodiment, the case where the determination temperature of hot water in the first determination criterion and the second determination criterion has hysteresis has been described in detail. For example, the first determination criterion includes the first determination criterion. The remaining hot water amount may be determined and displayed using only the first water upper limit temperature and using only the second water upper limit temperature as the second determination criterion. According to this, it is possible to realize a remaining hot water amount display that does not give the user a sense of incongruity with simpler control.

  As described above, according to the present invention, since the display of the remaining hot water amount is determined and displayed based on an accurate determination criterion corresponding to the user's feeling of use, a hot water storage type hot water heater that does not give the user a sense of incongruity can be provided.

DESCRIPTION OF SYMBOLS 100 Hot water storage type water heater 1 Heat pump unit 2 Tank unit 10 Hot water storage tank 10a Remaining hot water temperature sensor 10b Remaining hot water temperature sensor 10c Remaining hot water temperature sensor 10d Remaining hot water temperature sensor 45 Control part 46 Remote control 461 Display part 462 Remaining hot water amount display part 463 Operation display Part

Claims (6)

A hot water storage tank,
A plurality of remaining hot water temperature sensors for detecting the temperature of hot water in the hot water storage tank;
From the detection value of the remaining hot water temperature sensor, the remaining hot water amount calculating means for calculating the remaining hot water amount in the hot water storage tank,
A remaining hot water amount display means for displaying a calculation result of the remaining hot water amount calculation means;
A hot water storage water heater equipped with
The remaining hot water amount calculating means includes a first determination criterion for determining that there is remaining hot water when a detected value of the remaining hot water amount sensor is higher than a predetermined threshold;
A second criterion for determining that there is remaining hot water when the detection value of the remaining hot water amount sensor is higher than a second threshold value higher than the predetermined threshold value;
And it has a,
An operation state display unit for displaying an operation state of the hot water storage water heater;
When the user uses the user's operation or the hot water storage type hot water heater, the hot water storage
If there is a change in the amount of hot water in the tank,
The operating state is displayed on the operating state display unit, and the remaining hot water amount calculating means
A hot water storage type hot-water supply machine using the first determination criterion for the calculation of the amount of hot water. A hot water storage tank,
One or more remaining hot water temperature sensors for detecting the temperature in the hot water storage tank;
A first determination criterion for determining whether the temperature is detected by each remaining hot water temperature sensor or a first hot water lower limit temperature or a first water upper limit temperature higher than the first hot water lower limit temperature; ,
The temperature detected by each remaining hot water temperature sensor is compared with a second hot water lower limit temperature not higher than the first hot water lower limit temperature or a second water upper limit temperature not lower than the first water upper limit temperature. A second criterion to determine;
A remaining hot water amount calculating means for calculating a remaining hot water amount stored in the hot water storage tank from hot water information determined by the first determination criterion or the second determination criterion;
A remaining hot water amount display unit for displaying the remaining hot water amount calculated by the remaining hot water amount calculating means;
Determination temperature selection means for selecting one of the first determination criterion or the second determination criterion;
A hot water storage type water heater characterized by comprising An operation state display unit for displaying an operation state of the hot water storage water heater;
When a change in the amount of hot water in the hot water storage tank is caused by the user's operation or the user using the hot water storage type hot water heater,
The operation state is displayed on the operation state display unit, and the first determination criterion is used for calculation of the remaining hot water amount by the remaining hot water amount calculating means.
The hot water storage type water heater according to claim 2 . When there is no change in the amount of hot water in the hot water storage tank for a predetermined time,
The remaining hot water amount calculating means includes:
When the mode shifts to a mode in which the remaining hot water amount is determined using the second determination criterion, and a change in the remaining hot water amount in the hot water storage tank is detected by the second determination criterion, the remaining hot water amount is determined using the first determination criterion. Transition to a mode to determine
The hot water storage type water heater according to any one of claims 1 to 3, wherein When the hot water storage water heater is not performing an operation related to the increase or decrease of hot water in the hot water storage tank,
The remaining hot water amount calculating means determines the remaining hot water amount using the second determination criterion.
The hot water storage type water heater according to any one of claims 1 to 4. When the function of moving the hot water storage type water heater regardless of the operation of the user is activated,
The remaining hot water amount calculating means determines the remaining hot water amount using the second determination criterion.
The hot water storage type water heater according to any one of claims 1 to 5.

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