JPS58130945A - Control device for hot-water reserving type electric water heater - Google Patents

Abstract

PURPOSE:To reduce heat dissipating loss and improve power transmission efficiency by a method wherein a device capable of presetting the amount of hot-water to be ued is provided so as not to heat the amount of hot-water, which is more than required amount, and a conducting load of electric power is distributed properly by a central control unit. CONSTITUTION:Respective hot-water reserving type electric water heaters 5, 5' are provided with regular hot-water quantity setting means 6, 6', temporary hot-water quantity setting means 7, 7', feed water temperature detecting means 8, 8', operating means 9, 9', operaring the amount of heat to be reserved from the set values preset by the means 6, 6' or the means 7, 7' and the feed water temperature detected by the means 8, 8', to operate the necessary conducting time of electric power supplied to the heating bodies 2, 2' from said operated value, transmitting means 10, 10' sending said operated necessary conducting time of the electric power to the central control unit 12 as a signal, and electric power conduction control means 11, 11', while the unit 12 is provided with a receiving means 13, a time distribution control means 14 and a central transmitting means 15. The signals of the necessary conducting times for respective heaters are received by the means 13, the conducting times for respective heaters are distributed properly by the means 14, and the conducting times for respective heater are instructed from the means 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device that centrally controls the energization time to the heating elements of a plurality of hot water storage type electric water heaters in a certain area or condominium using a central controller.

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 the hot water storage tank and 2 is the heating element.

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

Next, we will explain its function using a general late-night power supply as an example. 9 Heating element 2 heats water at around 8 °C to about 85 °C during the late-night power supply time to bring the water temperature to winter water temperature.
The capacity of the heating element is set in advance so as to raise the groove. 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 SWL are not always the same, and the amount of water used each day varies 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 the water supply temperature is high or there is residual hot water, #
! When the electricity is turned on at night, the electricity starts all at once, and the water gets boiling in a short time. In the past, the power load was concentrated for several hours immediately after the start of electricity supply, making it impossible to equalize the power load, which was the original purpose of late-night power, resulting in poor power transmission efficiency, and It is necessary to leave the high-temperature hot water unused for a long time, which has the disadvantage of increasing heat loss due to natural heat radiation from the hot water storage tank 1 and heat radiation of hot water stagnant in the pipes. .

This invention was made in view of the above points, and includes a device that can preset the amount of hot water used in each of a plurality of hot water storage type electric water heaters to prevent boiling more water than necessary, and central control. The above-mentioned drawbacks of the prior art are overcome by appropriately distributing the energized load depending on the device.

The present invention will be explained below based on the control block diagram shown in FIG. In Figure 3, 5.5' is the heating element 2, 2'
The figure shows a hot water storage type electric water heater body using a hot water storage type electric water heater as a heating source, and a constant hot water amount setting device 6, 6' for presetting the amount of hot water stored in the hot water storage tanks 1 and 1' for the next day, and a device for one-time use as well. Temporary hot water amount setting device 7 for presetting the hot water amount
．． 7', water supply temperature sensors 8, 8' for detecting the temperature of water supplied to the hot water storage tank 1, and the constant hot water amount setting device 6.
, 6' or provisional hot water amount setting device T.

The thermal calorie of the hot water to be stored in the hot water storage tank 1 is calculated from the set value set in step 1' and the water supply temperature detected by the water supply temperature sensor 8°8'. computing units 9, 9' for calculating the required energization time to ', and a transmitter 10 for sending the required energization time calculated by the computing units 9, 9' as a signal to the central*m device t12, which will be described later. 10' and energization control device 11, 1
1'.

12 is a central controller, receiver 139 time control jl
Vessel 14. It is equipped with a central transmitter 15.

The receiver 13 receives the signal of the required energization time of each machine sent by the transmitter 10, 10', and the time distribution control device 14 totals the required energization time for a total loss and calculates the energization time of each machine. The central transmitter 15 instructs the energization control devices 11 and 11' of each machine to control the energization time in a centralized manner.

Next, a concrete example of its operation will be explained using symbols and formulas.

Steady hot water amount setting device 6, 6' and provisional hot water amount setting device 7.1'
The amount of hot water to be used is normally set by the constant hot water amount setting devices 6, 6', but if, for example, you do not take a bath the next day or do not use hot water, the provisional hot water amount setting device 7.
The amount of hot water used is set by operating T', and the next day it automatically returns to the value set by the constant hot water amount setting devices 6, 6'.

First, the constant hot water amount setting device 6 of each electric water heater 5, 5',
6' or provisional hot water amount setting device7. The next day's use-child settings input to T' are set to V liters and hot water temperature T"C, and the water supply temperature sensor 8, immediately after the midnight power supply time starts,
If the detected value of 8' is t°C, then the computing units 9 and 9' are as follows.

It calculates the thermal calorie K that should be stored in the hot water storage tanks 1 and 1' by calculating K = (T-t) x V (h).

Furthermore, the computing units 9 and 9'.

Calculate 5H = (hr) 60XW and calculate each electric water heater 5.5' from the above thermal calories.
This is to calculate the required energization time H (hr) to (
1011=860&j). Here, W is the heating element 2, 2
' Rated power consumption (El) t-represents and,
Each required energization time H (h
r) is sent as a signal from the transmitter 10゜10' to the receiver 13 of the central control device 12, and is aggregated by the hourly distribution control device 14, and then calculated during the late-night power supply hours (from 11 p.m. to 7 a.m. the next morning). The energization controller 1 of each machine is distributed as a signal from the central transmitter 15 so that the power load is averaged.
1.11'. Power supply controllers 11, 11 for each machine
' is controlled by the heating element 2.2' by a signal from the central transmitter 15.
Controls the energization time. For example, in a certain area or apartment building, if 200 electric water heaters can each generate a certain amount of electricity by turning on electricity for 3 hours, then 100 electric water heaters should be turned on from 11pm to 2am the next morning, and the other 100 water heaters should be turned on from 11pm to 2am the next morning. The electricity is distributed from 2:00 to 5:00 the next morning to keep power peaks as low as possible.

As explained above, in the present invention, each of a plurality of hot water storage type electric water heaters is equipped with a hot water amount setting device that can not only set the constant hot water amount but also temporarily set the hot water amount as appropriate. Only the amount of hot water can be raised, which reduces the amount of remaining hot water and reduces various heat losses, resulting in lower maintenance costs.

In addition, since the central controller performs centralized control so that the power load is averaged, it has the effect of alleviating peak power loads and improving power transmission efficiency.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of two common hot water storage type electric water heaters installed in parallel, Fig. 2 is a main electrical circuit diagram of a conventional hot water storage type electric water heater, and Fig. 3 is a control block diagram according to the present invention. 2t-shown. - 1.1' is the hot water storage tank, 2,1 is the heating element, 5゜5' is the electric water heater body, and 6.6' is the constant hot water amount setting device t7tγ'
8.8' is the provisional hot water amount setting device, 8.8' is the water supply temperature sensor, 9
．． 9' is an arithmetic unit t 10 =10' is a transmitter, 11.
11' is an energization control device, 12 is a central control device, 13 is a consumer, 14 is a time distribution controller, and 15 is a central transmitter. Agent Shin Kuzuno - (1 other person) Figure 1 Figure 2

Claims (1)

[Claims] Each of the plurality of hot water storage type electric water heaters includes a constant hot water amount setting means for presetting the constant amount of hot water to be used stored in the hot water storage tank, and a provisional hot water amount setting means for setting the amount of hot water for one-time use in advance. and a water supply temperature detection means for detecting the temperature of water supplied to the hot water storage tank, a set value set by the steady hot water amount setting means or provisional hot water amount setting means, and a water supply temperature detected by the water supply temperature detection means. 9. Calculating means for calculating the amount of heat and calculating the required energization time for the heating element of each electric water heater from the calculated value; and transmitting means for sending the required energizing time calculated by the calculating means to the central control unit as a signal. A central control device is provided, each having energization control means, a reception means, a time allocation control means, and a central transmission means, and the reception means receives a signal of the required energization time of each machine transmitted by the transmission means. 9. The time distribution control means aggregates the required energization time for the entire machine, distributes the energization time of each machine appropriately, and centrally controls the energization time by giving an instruction of the energization time to the energization control means of each machine from the central transmission means. A control device for a hot water storage electric water heater.