JPS58130936A - Control device for hot-water reserving type water heater - Google Patents

Abstract

PURPOSE:To improve power transmission efficiency and reduce heat dissipating loss by a method wherein the necessary operating time of a heating body is operated from the amount of remaining heat in the hot-water and the operating times of a plurality of water heaters are controlled concentrically by a central control unit so as to distribute them uniformly. CONSTITUTION:Respective water heaters 1, 2 are provided with remaining hot-water sensors 3, 3', sensing the amount of remaining hot-water in a hot-water reserving tank, remaining water temperature sensors 4, 4', sensing the temperature of remaining water in the same tank, and timer devices 6, 6' to set the operating times of the heating bodies 5, 5' while a central control unit 11 is provided with operators 7-9 and a timer control unit 10. The amount of heat in the remaining hot-water is operated by receiving the signals from the sensors 3, 3' and the sensors 4, 4', the amount of heat to be applied is operated by the operator 8 from the amount of heat in the remaining hot- water operated by the operator 7, the necessary operating times of the heating bodies 5, 5' are operator 9 from the amount of heat operated by the operator 8, and the timer devices 6, 6' are controlled concentrically by the signal from the timer control device 10 so that these necessary operating times are distributed properly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for centrally controlling the operation time of heating elements of a plurality of hot water storage type water heaters such as hot water storage type electric water heaters using a central controller.

In conventional hot water storage type electric water heaters that use late-night power, the power supply time is constant during the night, so the heat generating capacity of the heating element is adjusted to match the winter conditions when hot water consumption is high, so that the water temperature is between 5 and 10 degrees Fahrenheit during the power supply time. The temperature is set to boil from 85°C to the boiling water temperature setting.

For this reason, during summers when the amount of hot water used is low, more than half of the hot water often remains in the hot water storage tank. In this case, when it is time for the power to be turned on late at night, the power starts to turn on all at once, and the power builds up in a short period of time. This not only led to the concentration of the electrical load, resulting in poor power transmission efficiency, but also resulted in unnecessarily high-temperature hot water being left unused for long periods of time, resulting in large heat loss.

This invention was made in view of the above points, and it calculates the required operating time of the heating element from the heat value of the remaining water, and centrally controls the multiple water heaters by a central controller while distributing this time evenly. In other words, the above-mentioned conventional inconveniences are solved.

An embodiment of the present invention will be described below with reference to the drawings. 1.
Reference numeral 2 denotes a hot water storage type electric water heater body, which includes a remaining hot water amount sensor 3゜3' that detects the amount of hot water remaining in the hot water storage tank, residual hot water temperature sensors 4 and 4' that also detect the temperature of the remaining hot water, and a heating element 5.
, 5', a timer device 6. f
It is equipped with Reference numeral 11 denotes a central control unit, which includes first to third arithmetic units 1,8°9 and a timer device 6. The first computing unit 7 receives signals from the remaining hot water amount sensors 3, 3' and the remaining hot water temperature sensors 4, 4' to calculate the remaining hot water heat calories. The computing unit 8 calculates the heat calories to be added from the remaining hot water heat calories calculated by the first computing unit 7.

The third calculator 9 calculates the required energization time to each of the electric water heaters 1 and 2 from the thermal calories calculated by the second calculator 8. Then, the timer control device 1° distributes the required power supply time to each electric water heater 1.2 calculated by the third computing unit 9 so that the power load is averaged during the late night power supply time period. Timer device for electric water heaters 1 and 26.
Send a signal to each electric water heater 1, 20 heating element 5. This is to control the energization time of the device. In addition, 12.12' is a transmitter for transmitting information from the remaining hot water amount sensors 3, 3' and the remaining hot water temperature sensor 4°4' to the central control device 11;
14 is a receiver for receiving signals from transmitters 12 and 12', and 14 is a receiver for receiving signals from the timer control device 1o.
, 72.

15 and 15' are receivers for receiving signals from the transmitter 14.

Next, an example of its operation will be explained using symbols and formulas. To explain mainly about the electric water heater 1, the capacity of the hot water storage tank is v liters (hot water temperature setting value T□℃), the detected value of the remaining hot water amount sensor 3 is V liters, and the detected value of the remaining hot water temperature sensor 4 is T-
℃, the first arithmetic unit T calculates Kl = (T2-
a) Calculate the remaining hot water heat calories by calculating X v, and the second calculator 8 calculates Kz =' (Tl a )
By calculating xV xl , 2 is calculated as the heat calorie that should be added to the hot water storage tank by the end of the late-night electricity supply time. Here, a is a constant and is set, for example, to the annual minimum water supply temperature.

Then, the third calculator 9 calculates the required energization time T=/(860XW)(H) to the heat calorie calculated by the second calculator 8. here'!
:W is the heating element capacity (rose) and 860 is 1 (ai! Y
This is a numerical value for converting to ri. Also.

The required energization time for the electric water heater 2 is calculated in the same way as for the electric water heater 1, and the timer control device 1 of the central control device 11
The timer device 6 of each electric water heater 1, 2 distributes the required energization time determined by 0 so that the power load is averaged during the late-night power energization period (from 11:00 p.m. to 7:00 a.m. the next morning).
Send a signal to 6'.

Each electric heating element5. Controls the energization time of the device. For example, if two electric water heaters are each calculated to require three hours of power-on time, one unit will run from 11:00 p.m. The remaining 10,000 stations will be energized, and the others will remain energized from 2:00 a.m. to 5:00 a.m. the next morning, with power peaks kept as low as possible.

Incidentally, in the above embodiment, no mention was made of the signal line connecting the central control unit and each water heater, but it is also possible to transmit the signal by power line transport. I! In the example, central control of electric water heaters was mentioned.

It is clear that the present invention can also be applied to water heaters that utilize combustion heat.

As explained above, in the present invention, the amount of heat remaining in the hot water is calculated, the required operating time for each is calculated, and each of the plurality of water heaters is centrally controlled by the central controller while distributing this time evenly. For example, in the case of an electric water heater, central control is performed so that the power load is averaged, so peaks in the power load can be alleviated and power transmission efficiency can be improved. To the east, leave hot water unused for a long time! This has the advantage of reducing various heat radiation losses and lowering maintenance costs.

[Brief explanation of the drawing]

The figure is a control block diagram of a hot water storage type electric water heater which is an embodiment of the present invention. 1.2...Electric water heater 3,3'...Remaining hot water amount sensor 4.4'...Remaining water temperature sensor 5. Da...
Heating element 6.6'...Timer device T...First computing unit 8...Second computing unit 9--Third computing unit
10.--Timer control device 11.-Central control device representative Shin Kuzuno-(1 other person)

Claims (1)

[Claims] Each of the plurality of water heaters is equipped with a remaining hot water amount sensor that detects the amount of hot water remaining in the hot water storage tank, a remaining hot water temperature sensor that also detects the temperature of the remaining hot water, and a timer device that sets the operating time of one heating element. A central control device including first to third computing units and a timer control device is provided, and the first computing unit calculates the heat amount of the remaining water in response to a signal from the remaining hot water amount sensor and a signal from the remaining hot water temperature sensor. In addition to calculating this ′j
The amount of heat to be added from the remaining water heat amount by the calculation unit of s1 is determined by the second
A third computing unit calculates the required operating time of the heating element from the amount of heat determined by the second computing unit, and a signal from the timer control device so that the required operating time is distributed appropriately. A control device for a hot water storage type water heater characterized by centrally controlling a timer device of each water heater.