JP2000213812A - Storage type electric water heater and method for calculating quantity of used hot water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To notify run out of hot water to a user by providing a section for operating the quantity of used hot water stored in a hot water storage tank, and a section for outputting the operation results. SOLUTION: A quantity of hot water QK being mixed with water in order to produce hot water is determined according to a formula; QK=QC (TC-TW)/(TJ-TW) Where, TJ is boil-up temperature of hot water in a hot water storage tank 2, TW is supply water temperature, TC is the set temperature of hot water being supplied to a user, and QC is integrated flow rate. An operating section 11 for used quantity of hot water compares the QK with the capacity Q of the hot water storage tank 2 and makes a decision that hot water in the hot water storage tank 2 has run out if 'QK>Q' is satisfied and displays the fact at the display section of a remote controller 8. Since the quantity of used hot water QK supplied from the hot water storage tank 2 is operated and the operation results are displayed, the quantity of used hot water QK is determined and overuse of hot water can be discriminated from malfunction of hot water supply apparatus when hot water supply is interrupted on the user side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type electric water heater in which a user is notified of the amount of hot water stored in a hot water tank, and a method for calculating the amount of hot water used.

[0002]

2. Description of the Related Art An example of a hot water storage type electric water heater will be described with reference to FIG. FIG. 2 is a configuration diagram showing a configuration of a conventional hot water storage type electric water heater. In FIG. 2, reference numeral 1 denotes a pressure reducing valve, which reduces the pressure of a supplied tap water source. Reference numeral 2 denotes a hot water storage tank for storing water supplied through the pressure reducing valve 1 or hot water obtained by heating the water. Reference numeral 3 denotes a heating element, which is provided in the hot water storage tank 2 and heats and raises the temperature of water stored in the hot water storage tank 2 to boil it. 4 is a temperature detector,
It is provided in hot water storage tank 2 and detects the temperature of hot water stored in hot water storage tank 2. That is, the temperature of hot water supplied from hot water storage tank 2 is detected.

Reference numeral 5 denotes an electric hot water mixing valve, in which the hot water boiled in the hot water tank 2 and the water supplied through the pressure reducing valve 1 without passing through the hot water tank 2 are mixed. A hot water of a predetermined temperature is produced. The hot water produced by the electric hot water mixing valve 5 is heated to a predetermined temperature by the electric control of the control unit 9, the mixing ratio of the hot water boiled in the hot water storage tank 2 and the water supplied from the water source changes. . The temperature of the hot water produced by the electric hot / water mixing valve 5 is a desired temperature designated to the control unit 9 using the remote controller 8.

A relief valve 6 is provided between the hot water tank 2 and the electric hot water mixing valve 5. The relief valve 6 is connected to the hot water tank 2
The volume expands while boiling the water in the storage tank 2
This is for letting out water that exceeds the capacity. A hot water supply pipe 7 supplies hot water mixed to a desired temperature by the electric hot water mixing valve 5 to a user on the faucet side. Reference numeral 8 denotes a remote controller, which is connected to the control unit 9. This remote control 8
Has an input section, and designates the temperature of hot water produced by the electric hot / water mixing valve 5. Reference numeral 9 denotes a control unit which controls the energization of the heating element 3 and the mixing ratio of hot water and water in the electric hot water mixing valve 5.

Next, the operation of the conventional hot water storage type electric water heater shown in FIG. 2 will be described. Water supplied from the water source is reduced in pressure through the pressure reducing valve 1. The water depressurized through the pressure reducing valve 1 is then branched into pipes, one of which flows into the hot water storage tank 2 and the other flows into the water supply side of the electric hot and cold water mixing valve 5. The hot water storage tank 2 to which the water is supplied is always full of water or hot water obtained by heating the water.
In addition, hot water can be produced at low cost by using midnight power to heat the water stored in the hot water storage tank 2.

[0006] The water stored in the hot water storage tank 2 is heated by the heating element 3, and when it becomes hot water of a predetermined temperature (for example, about 90 ° C), the heating is stopped. The temperature of the hot water is detected by a temperature detector 4 provided in the hot water storage tank 2. Then, based on the detection result of the temperature detector 4, the control unit 9 stops energization of the heating element 3 and stops heating of the heating element 3. The water stored in the hot water storage tank 2 expands in volume when heated. Therefore, hot water tank 2
The water (hot water) expanded so as to exceed the capacity of the hot water storage tank 2 is drained from the relief valve 6 by an amount exceeding the capacity of the hot water storage tank 2.

Thereafter, the hot water stored in the hot water storage tank 2 flows into the hot water supply side of the electric hot water mixing valve 5 by opening the faucet, and is mixed with the water branched from the pressure reducing valve 1 and flowing therethrough. Hot water is supplied to the side. At this time, the temperature of the hot water to be supplied is controlled by the control unit 9 so that the temperature of the hot water is preset by the remote controller 8. If the amount of used hot water exceeds the capacity of the hot water storage tank 2, the hot water storage type electric water heater runs out of hot water.

[0008]

As described above, in the conventional hot water storage type electric water heater, even if the hot water runs out, whether the cause is excessive use of hot water or a failure of the equipment is determined. I couldn't judge easily.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and provides a user of a hot water storage type electric water heater with:
A hot water storage type water heater that indicates whether the cause of running out of water is due to excessive use of hot water or a malfunction of the equipment.
And a method for calculating the amount of hot water used.

[0010]

SUMMARY OF THE INVENTION A hot water storage type electric water heater according to the present invention includes a hot water storage tank to which water is supplied from a water source, a heating element for heating the water stored in the hot water storage tank, the temperature of the water and the inside of the hot water storage tank. A temperature detector for detecting the temperature of the hot water obtained by heating, an electric hot water mixing valve for mixing the water supplied from the water source and the hot water supplied from the hot water storage tank, and a predetermined mixture mixed by the electric hot water mixing valve. A flow rate integration unit that is installed in a hot water supply pipe that supplies hot water at the water temperature and integrates the flow rate of hot water flowing through the hot water supply pipe, the integrated flow rate of the hot water integrated by the flow rate integration unit, the temperature of hot water in the hot water tank, and the supply from the water source From the temperature of the water to be heated, and the temperature of the hot water obtained by the electric hot water mixing valve, a hot water usage calculating unit that calculates the usage of hot water stored in the hot water tank, and
It is provided with an output unit for outputting a calculation result in the hot water consumption calculation unit.

[0011] In the hot water storage type electric water heater according to the present invention, the output section outputs the amount of hot water used in the hot water storage tank.

Further, in the hot water storage type electric water heater according to the present invention, the output section outputs the ratio between the capacity of the hot water tank and the amount of hot water stored in the hot water tank.

Further, in the hot water storage type electric water heater according to the present invention, the output unit displays the calculation result in the used hot water amount calculation unit.

Further, in the hot water storage type electric water heater according to the present invention, the output section outputs the calculation result in the used hot water amount calculation section using voice.

Further, in the hot water storage type electric water heater according to the present invention, the output section outputs the calculation result of the hot water consumption calculating section using the light source.

A method for calculating the amount of hot water used by a hot water storage type electric water heater according to the present invention includes a hot water storage tank to which water is supplied from a water source, a heating element for heating the water stored in the hot water storage tank, a temperature of the water and a temperature in the hot water storage tank. A temperature detector that detects the temperature of the hot water obtained by heating, an electric hot water mixing valve that mixes the water supplied from the water source and the hot water supplied from the hot water tank, and a predetermined water temperature mixed by the electric hot water mixing valve. A flow rate integrating unit that is provided in a hot water supply pipe that supplies hot water, and that integrates a flow rate of hot water flowing through the hot water supply pipe, a hot water amount calculating unit that calculates the amount of hot water stored in a hot water storage tank, and a hot water amount calculating unit. The output unit outputs the calculation result of the hot water consumption calculation unit, the flow rate of the hot water integrated by the flow rate integration unit, the temperature of the water and the temperature of the hot water detected by the temperature detector, and the electric hot water mixing valve From the resulting hot water temperature, It is intended for calculating the amount of the obtained water.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hot water storage type electric water heater according to the present invention,
An embodiment of a method for calculating the amount of hot water used will be described with reference to FIG. FIG. 1 is a configuration diagram showing a configuration of a hot water storage type electric water heater of the present invention. In FIG. 1, reference numeral 10 denotes a flow rate integrating unit, which is provided in the hot water supply pipe 7 and integrates the amount of hot water supplied from the electric hot water mixing valve 5. Data on the accumulated flow rate, which is the accumulated amount of hot water, is notified to the hot water consumption calculating unit 11.

Reference numeral 11 denotes a used water amount calculating unit, which is connected to the temperature detector 4, the electric hot water mixing valve 5, the flow rate integrating unit 10, and the remote controller 8. The used hot water amount calculation unit 11 calculates the integrated flow rate detected by the flow rate integration unit 10, the set temperature of the hot water obtained by being mixed by the electric hot water mixing valve 5, the temperature of the water supplied from the water source, and the temperature supplied from the hot water tank 2. The amount of hot water supplied from hot water storage tank 2 is calculated from the temperature of the hot water to be used.

The remote controller 8 has an input section and a display section (output section). The display of the remote controller 8 includes a hot water tank 2
The amount of hot water supplied from is displayed. Further, the display unit of the remote controller 8 may display whether or not the amount of hot water in the hot water tank 2 exceeds the capacity of the hot water tank 2. In FIG. 1, the same or corresponding parts as those in the conventional example shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted, and the parts different from FIG. 2 are described.

Next, the operation of the hot water storage type electric water heater according to the first embodiment of the present invention shown in FIG. 1 will be described. Water supplied from the water source is reduced in pressure through the pressure reducing valve 1. This pressure reducing valve 1
After that, the water decompressed through the pipe is branched, and one of the water flows into the hot water tank 2 and the other flows into the water supply side of the electric hot / water mixing valve 5. The capacity of the hot water storage tank 2 is Q.

The hot water storage tank 2 to which water is supplied is always full of water or hot water obtained by heating the water. In addition, hot water can be produced at low cost by using midnight power to heat the water stored in the hot water storage tank 2. The water stored in the hot water storage tank 2 is heated by the heating element 3, and when the water becomes a predetermined temperature (for example, about 90 ° C.), the heating is stopped. The predetermined temperature is TJ. The temperature of the hot water is detected by a temperature detector 4 provided in the hot water storage tank 2. Then, based on the detection result of the temperature detector 4, the control unit 9 stops energization of the heating element 3 and stops heating of the heating element 3.

The temperature detector 4 is provided from the water source to the hot water tank 2.
The temperature of the water supplied to is also detected in advance. In addition,
As a method of detecting the water temperature, there is a method of detecting the surface temperature of the hot water storage tank 2 and the like. Further, a temperature detector for measuring the water temperature and a temperature detector for measuring the hot water temperature may be provided separately. At this time,
A temperature detector for measuring the water temperature is provided on a pipe on the water supply side to the electric hot / water mixing valve 5. The temperature of the water supplied from this water source is TW. Further, when the water stored in the hot water storage tank 2 is heated, its volume expands. Therefore, the water (hot water) expanded so as to exceed the capacity of the hot water tank 2 is drained from the relief valve 6 by an amount exceeding the capacity of the hot water tank 2.

Thereafter, the hot water stored in the hot water storage tank 2 flows into the hot water supply side of the electric hot water mixing valve 5 by opening the faucet, and is mixed with the water branched from the pressure reducing valve 1 and flows therethrough. Hot water is supplied to the side. At this time, the temperature of the hot water to be supplied is controlled by the control unit 9 so that the temperature of the supplied hot water (for example, 40 ° C.) is preset by the remote controller 8. The pre-designed hot water temperature is TC.

Then, the hot water supplied from the electric hot / water mixing valve 5 is detected by an integrated flow rate unit 10 provided in the hot water supply pipe 7 as an integrated flow rate. Note that this integrated flow rate is QC. The accumulated flow rate QC is counted from the time when hot water is supplied from the hot water storage tank 2 and reset when the boiling of one day is completed.

When hot water is supplied to the faucet side, the amount of hot water supplied from hot water storage tank 2 is displayed on the display of remote controller 8. The amount of hot water supplied from the hot water storage tank 2 displayed on the display unit of the remote controller 8 is used by the hot water amount calculation unit 1
1 is calculated based on the following formula. Note that QC is an integrated flow rate of hot water obtained by mixing hot water and water, which is detected by the flow rate integration section 10. TJ is the boiling temperature of the hot water in the hot water tank 2, TW is the temperature of water supplied from the water source supplied to the hot water tank 2, and TC is the remote control 8
Is the set temperature of the hot water to be supplied to the user on the faucet side at the electric hot and cold water mixing valve 5 set by the formula (1). Furthermore, QK
Is the amount of hot water supplied from the hot water storage tank 2 before being mixed with water to obtain hot water.

QK = QC (TC−TW) / (TJ−TW)

Next, in the hot water usage calculating section 11, the hot water usage QK obtained from the above equation and the capacity Q of the hot water storage tank 2 are calculated.
Compare with As a result, when “QK> Q” is satisfied, it is determined that the hot water tank 2 has run out of water, and the remote controller 8
Is displayed on the display section. Note that what is displayed on the display unit of the remote controller 8 is the amount of hot water used QK supplied from the hot water tank 2.
Or the ratio of the amount of hot water used QK to the capacity Q of the hot water storage tank 2 may be indicated.

The display on the display of the remote controller 8 is not displayed when the amount of hot water used QK exceeds the capacity Q of the hot water tank 2, but is displayed when the amount QK of hot water is used.
May be displayed when a predetermined ratio is exceeded. Further, as for the display method on the display unit of the remote controller 8, the numerical value calculated by the hot water consumption calculating unit 11 may be displayed as it is, or the user may be notified using voice. Also, when the amount of hot water used QK exceeds a predetermined ratio with respect to the capacity Q of the hot water tank 2, for example,
A lamp or the like may be turned on or blinked. At this time, the amount of hot water used QK may be determined in multiple stages with respect to the capacity Q of the hot water tank 2 so that the voice and the blinking interval may be varied.

As described above, the amount of hot water QK supplied from the hot water storage tank 2 is calculated by the hot water usage calculation unit 11 and the display based on the calculation result is displayed on the display unit of the remote controller 8 to provide the hot water storage tank. The amount of hot water supplied from 2 is used, and even when the user stops supplying hot water, it is possible to determine whether the use of hot water is excessive or the water heater is defective.

[0030]

As described above, the hot water storage type electric water heater according to the present invention is a hot water storage tank to which water is supplied from a water source, a heating element for heating the water stored in the hot water storage tank, the temperature of the water and the hot water storage tank. A temperature detector for detecting the temperature of the hot water obtained by heating in the water, an electric hot water mixing valve for mixing the water supplied from the water source and the hot water supplied from the hot water storage tank, and a predetermined mixture mixed by the electric hot water mixing valve. A flow integrating unit that is installed in a hot water supply pipe that supplies hot water at the same temperature as the hot water and that integrates the flow rate of the hot water flowing through the hot water supply pipe A hot water usage calculator that calculates the amount of hot water stored in the hot water tank from the temperature of the water to be supplied and the temperature of the hot water obtained by the electric hot water mixing valve, and outputs the calculation results of the hot water usage calculator. It has an output section, The use amount of hot water supplied from the hot water storage tank is calculated by the output unit, and the output amount based on the calculation result is calculated by the output unit. Even when the supply of hot water is stopped, it is possible to determine whether the use of hot water is excessive or the water heater is defective.

Further, the method for calculating the amount of hot water used by the hot water storage type electric water heater according to the present invention includes a hot water storage tank to which water is supplied from a water source, a heating element for heating the water stored in the hot water storage tank, the temperature of the water and the hot water storage tank. A temperature detector for detecting the temperature of the hot water obtained by heating in the water, an electric hot water mixing valve for mixing the water supplied from the water source and the hot water supplied from the hot water storage tank, and a predetermined mixture mixed by the electric hot water mixing valve. A flow rate integrating unit that is provided in a hot water supply pipe that supplies hot water having a water temperature of, and that integrates a flow rate of hot water flowing through the hot water supply pipe, a hot water amount calculation unit that calculates the amount of hot water stored in a hot water storage tank, and a hot water amount calculation The hot water consumption calculation unit includes an output unit that outputs a calculation result of the unit. From the temperature of the hot water obtained with the valve, Since the amount of hot water stored in the tank is calculated, the amount of hot water stored in the hot water tank can be calculated, and the user is prompted to supply water to the hot water tank before the supply of hot water stops. This makes it possible to prevent the water heater from malfunctioning.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a hot water storage type electric water heater of the present invention.

FIG. 2 is a configuration diagram showing a configuration of a conventional hot water storage type electric water heater.

[Explanation of symbols]

1 pressure reducing valve, 2 hot water tank, 3 heating element, 4 temperature detector, 5 electric hot water mixing valve, 6 relief valve, 7 hot water supply pipe,
8 remote control, 9 control unit, 10 flow rate integration unit, 11
Hot water consumption calculation unit.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidetoshi Owada 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Manabu Ono 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (Reference) 3L073 AA03 AA15 AA18 AB09 AC02 AC10 AD03 AD06 AE08

Claims (7)

[Claims] 1. A hot water tank to which water is supplied from a water source, a heating element for heating water stored in the hot water tank, and detecting a temperature of the water and a temperature of hot water obtained by heating in the hot water tank. A temperature detector, an electric hot water mixing valve for mixing water supplied from the water source and hot water supplied from the hot water storage tank, and a hot water supply pipe for supplying hot water having a predetermined water temperature mixed by the electric hot water mixing valve. A flow rate integrating unit provided for integrating the flow rate of the hot water flowing through the hot water supply pipe; a flow rate of the hot water integrated by the flow rate integrating unit; a temperature of hot water in the hot water storage tank; and a temperature of water supplied from the water source. And a hot water consumption calculating unit that calculates the amount of hot water stored in the hot water storage tank from the temperature of the hot water obtained by the electric hot water mixing valve, and an output unit that outputs the calculation result of the hot water calculating unit. Characterized by having Storage-type electric water heater. 2. The hot water storage type electric water heater according to claim 1, wherein the output section outputs a usage amount of the hot water stored in the hot water storage tank. 3. The hot water storage type electric water heater according to claim 1, wherein the output section outputs a ratio between a capacity of the hot water tank and a usage amount of hot water stored in the hot water tank. 4. The hot-water storage type electric water heater according to claim 1, wherein the output unit displays a calculation result in the hot water consumption calculation unit. 5. The hot water storage type electric water heater according to claim 1, wherein the output section outputs the calculation result in the hot water usage calculating section using voice. 6. The hot water storage type electric water heater according to claim 1, wherein the output section outputs the operation result of the hot water consumption operation section using a light source. 7. A hot water tank to which water is supplied from a water source, a heating element for heating the water stored in the hot water tank, and detecting a temperature of the water and a temperature of the hot water obtained by heating in the hot water tank. A temperature detector, an electric hot water mixing valve for mixing water supplied from the water source and hot water supplied from the hot water storage tank, and a hot water supply pipe for supplying hot water having a predetermined water temperature mixed by the electric hot water mixing valve. A flow rate integrating unit that is provided and integrates a flow rate of the hot water flowing through the hot water supply pipe; a hot water amount calculating unit that calculates a usage amount of hot water stored in the hot water storage tank; and a calculation result of the hot water amount calculating unit. The output unit for outputting hot water is provided with an output unit that outputs the hot water flow rate integrated by the flow rate integrating unit, the temperature of the water and the temperature of the hot water detected by the temperature detector, and the electric hot water mixing valve. From the resulting hot water temperature, Hot water is calculated using the storage type electric water heater, characterized by calculating the amount of hot water stored in the hot water storage tank.