JPS58130946A - Control device for hot-water reserving type electric water heater - Google Patents

Abstract

PURPOSE:To improve power transmission efficiency and reduce heat dissipating loss by a method wherein the proper capacity of a heating body is operated from the set amount of hot- water to be used and the condition of a feed water temperature to conduct electric power evenly in the time band of conduction of the electric power. CONSTITUTION:Regular using amount of hot-water, to be stored in a hot-water reserving tank, is preset by a regular hot-water quantity setting means 5 and the amount of hot-water used by one time of using is preset by a temporary hot-water quantity setting means 6, while the temperature of water fed into the hot-water reserving tank is detected by a feed water temperature detecting means 7. The calory of heat for the hot-water to be reserved is operated in an operating means 8 from the set values preset by the means 5 or the means 6 and the feed water temperature detected by the means 7 and the necessary capacity of the heating body is operated from the operated calory of heat, further, the conduction of electric power supplied to the heating body 2 is controlled in an electric power control means 9 so that the heating element 2 is provided with the necessary capacity operated by the means 8. Accordingly, the load of the electric power may be averaged and the power transmission efficiency may be improved. Further, the high-temperature hot-water will never be left for a long period of time and the heat dissipating loss may be reduced.

Description

[Detailed Description of the Invention] This invention relates to a control device for a storage large electric water heater, which calculates an appropriate heating element capacity from the amount of hot water used and the water supply temperature, and always boils the water in a fixed amount of time. It is.

FIG. 1 is a block diagram of a general hot water storage type electric water heater, and FIG. 2 is a main electrical circuit diagram of a conventional hot water storage type electric water heater.

In the figure, 1 is a hot water storage tank and 2 is a heating element.

3 is an automatic temperature controller, and 4 is a power supply.

Next, we will explain its function using the case of using late-night power, which is generally practiced, as an example. 9 Heating element 2 heats water at around 8°C, which corresponds to the water temperature in winter, to about 85°C during the late-night power supply time.
The capacity of the heating element is set in advance so as to raise the temperature to . The automatic temperature controller 3 has a normally closed contact, and when the water in the hot water storage tank 1 reaches approximately 85°C, the contact is opened and the heating element 2
The hot water storage tank 1 is filled with hot water at 85° C. every morning.

However, the amount of hot water used and the water supply temperature are not always the same.9
The days vary greatly depending on the season. In particular, whether or not a person takes a bath is a factor that greatly influences the amount of hot water used, and on days when a person does not take a bath, more than half of the stored hot water may remain.

Therefore, if there is any remaining hot water, the electricity will start flowing all at once when the late night power is turned on, and the water will be turned on in a short period of time. Round 9: The power load is concentrated for several hours immediately after the start of energization! 0
．． fp4 It is not possible to equalize the power load, which is the original purpose of night electricity, and this results in poor power transmission efficiency.In addition, the high temperature hot water that has been raised cannot be left unused for a long time, and hot water storage is not possible. This has the drawback of increasing heat loss due to natural heat radiation from the tank 1 and heat radiation from hot water stagnant in the piping.

This invention attempts to eliminate these conventional drawbacks, and calculates the appropriate heating element capacity from the preset next day's amount of hot water used and water supply temperature, and calculates the #! This system uses the entire night power supply time to generate constant power.

The present invention will be explained below based on the energization control block diagram shown in the jIs diagram. In Fig. 3, reference numeral 5 denotes a provisional hot water amount setting device for presetting the amount of hot water to be used on the next day stored in the hot water storage tank 1 for a one-time use. For example, if you do not take a bath the next day or do not use hot water, the amount of hot water to be used is set by operating the provisional hot water amount setting device 6.
Two days later, the value set by the constant hot water amount setting device 5 is automatically restored again.

Reference numeral 7 denotes a water supply temperature sensor for detecting the temperature of water supplied to the hot water storage tank 1; 8, the constant hot water amount setting device 5; and 9, the setting value set by the provisional hot water amount setting device 6 and the water supply temperature sensor 7;
Calculate the thermal calories of the hot water to be stored in the hot water storage tank 1 from the detected values detected by the system, and use a calculator to calculate the required heating element capacity from the calculated thermal calories.
Reference numeral 9 denotes a power control device that controls energization to the heating element 2 so that the required heating element capacity calculated by this calculator is obtained.

Next, an example of the operation of the above configuration will be specifically explained using symbols and formulas. First, the amount of hot water to be used for the next day inputted by the steady water amount setting means 5 or the provisional hot water amount setting device 6 is set to v.
liter (hot water temperature T°C), and the detected value of the water supply temperature sensor 7 immediately after the start of the late-night power on time period is t°C, the calculator 8 first calculates K == (T - t) V (&ll). Calculations are performed to calculate the thermal calories K (&211
) is calculated.

Furthermore, the computing unit 8 calculates p== − based on the calculated amount of heat K.
(u+) 60X 8 is calculated to calculate the required heating element capacity P (approximately) from the thermal calorie K of the amount of hot water to be stored in the hot water storage tank 1. (I Ell = 860&j) Then, when the required heating element capacity '1 kP (elbow) is calculated by the calculator 8, the power control device 9 controls the amount of electricity to be applied to the heating element 2, and the amount of electricity supplied to the heating element 2 is controlled at a predetermined level throughout the late-night power supply time period. is added, and the hoisting is controlled so that it ends at the same time as the late-night power supply time ends.

Therefore, the power is always averaged over the entire power supply period during the night, which alleviates the concentration of power load, and also eliminates the need to leave hot water in the hot water storage tank 1 for a long time, reducing heat loss. It is Amano that can be done less. Furthermore, since the hot water amount setting can be set appropriately between a constant setting and a temporary setting, maintenance costs are also reduced.

In the above operation example, the case of using late-night power was explained, but the same effect can be obtained even if a timer mechanism is provided for general power use, which allows the user to input a desired time.

As described above, the present invention includes a constant hot water amount setting means for presetting and inputting the constant amount of hot water to be stored as the amount of stored hot water/the amount of hot water to be used regularly;
Temporary hot water amount setting means for presetting the amount of hot water to be used once @9, water supply temperature detection means for detecting the temperature of water supplied to the hot water storage tank, and the set value set by the hot water amount setting means and water supply temperature detection means. Calculating the thermal calories of the hot water to be stored from the detected value detected by the calculation means, calculating the required heating element capacity from the calculated thermal calories, and adding the required heating element capacity calculated by this calculation means. 9. It is equipped with a power control means for controlling the supply of electricity to the heating element. The required heat calories are calculated from the amount of hot water set by the user and the detected value of the water supply temperature to the hot water storage tank, and from this the heating element capacity is calculated and energized by averaging it over the energization time frame. Since it is configured to apply only the amount of heat calories that matches the amount of hot water, it is possible to equalize the power load and improve power transmission efficiency. In addition to the constant hot water flow setting, you can also select a temporary hot water flow setting as appropriate, which reduces the amount of hot water remaining each day.

It is easier to use, and since it is no longer left in hot water for a long time, various heat radiation losses are reduced and maintenance costs are reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a general hot water storage type electric water heater, and FIG. 2 is a block diagram of the main legs of a conventional hot water storage type electric water heater. 1 is a hot water storage tank, 2 is a heating element, 5 is a constant hot water amount setting device,
6 is a provisional hot water amount setting device, 7 is a water supply temperature sensor, 8 is a computing unit, and 9 is a power control unit. Agent Shin Kuzuno - (1 other person)

Claims (1)

[Claims] A steady hot water amount setting means for presetting the regular amount of hot water used to be stored in the hot water storage tank, a provisional hot water amount setting means for presetting the amount of hot water used once, and detecting the temperature of water supplied to the hot water storage tank. Calculates the thermal calories of the amount of hot water that should be stored from the water supply temperature detection means, the set value set by the steady hot water amount setting means or temporary hot water amount setting means, and the water supply temperature detected by the water supply temperature detection means, and calculates the thermal calories of the amount of hot water to be stored. A hot water storage type electric water heater comprising a calculation means for calculating the required heating element capacity from calories, and a power control means for controlling energization to the heating element so that the required heating element capacity calculated by the calculation means is added. Control device.