JPS58110945A - Control apparatus for hot-water storing type electric water heater - Google Patents

Abstract

PURPOSE:To reduce the heat loss and to rise the efficiency of power transmission, by heating only the required amount of water by providing a means for setting the amount of hot water in each of a plurality of hot-water storing type electric water heater, and levelling the load of electric power by means of a central control unit. CONSTITUTION:In each of hot-water storing type water heaters 1, 2, the quantity of heat (K1kcal) of hot water to be stored is calculated respectively by arithmetic means 5, 5' from the output signals of means 3, 3' for setting the amount of hot water to be used and sensors 4, 4' for detecting the temperature of water supplied to a hot-water storing tank. On the other hand, arithmetic means 8, 8' calculate the quantity of heat (K2kcal) of hot water left in the tank from the output signals of sensors 6, 6' for detecting the amount of hot water left in the tank, sensors 7, 7' for detecting the temperature of hot water left in the tank, and the sensors 4, 4'. Further, arithmetic means 9, 9' calculate the required current feeding time H from the quantity of heat to be imparted by use of an equation, H=(K1-K2)/860, and the time H is transmitted to a receiver 13 of a central control unit 12 from transmitters 10, 10'. Then, a time distributing controller 14 totalizes the required current feeding times for all of the water heaters and distributes the current feeding time appropriately to the water heaters, and the current feeding time thus distributed is instructed to each current supply controlling means 11, 11' from a transmitter 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for centrally controlling the energization time to the heating elements of a plurality of hot water storage type electric water heaters in an apartment or the like using a central control device.

In conventional hot water storage type electric water heaters that use late-night power, the power-on time during the night is constant, so the heat generating capacity of the 9 heating elements has been adjusted to match the winter conditions when hot water consumption is high, so that the water temperature is between 5 and 10 degrees during the power-on time. It is set to boil water from ℃ to about 85℃. For this reason, more than half of the hot water often remains in the hot water storage tank during summer months when the amount of hot water used is low. In this case, when it is time to turn on the electricity late at night, the electricity starts to turn on all at once, and the electricity 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 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 centrally control the water heater. The above-mentioned drawbacks of the prior art are overcome by evenly distributing the energized load through the device.

An embodiment of the present invention will be described below with reference to a control block diagram. Reference numerals 1 and 2 denote the main bodies of the hot water storage type electric water heater, each of which includes hot water amount setting devices 3 and 3 for presetting the amount of hot water to be used, and a water supply temperature sensor 4a for detecting the temperature of water supplied to the hot water storage tank. Computing units 5, 5' calculate the thermal calories of hot water to be stored in the hot water storage tank from the set value set by the hot water amount setting devices 3, 3' and the water supply temperature detected by the water supply temperature sensors 4, 4'. , a remaining hot water amount sensor 6, fr for detecting the amount of remaining hot water in the hot water storage tank, a remaining hot water temperature sensor 7, r for similarly detecting the temperature of remaining hot water in the hot water storage tank, and each of the above-mentioned sensors 4, 6. ,7. and 4.
g.

Calculator B 8 , a for calculating the remaining hot water thermal calories from the water supply temperature, remaining hot water amount, and remaining hot water temperature detected by 7′.
', calculation units C9, 9' for calculating the required energization time from the difference in heat calories determined by the calculation units 5.5' and calculation units 8, 8', and calculation units C9, 9'. Transmitters 10, 10' and 1 energization control device 11. transmit the required energization time as a signal to a central control device 12, which will be described later. it
' Equipped with '.

Reference numeral 12 denotes a central control unit, which includes a receiver 13, a time allocation controller 14, and a central transmitter 15.
, 10', the receiver 13 receives the signal of the required energization time of each machine, and the hour distribution control device 14 totals the required energization time of all the machines, and allocates the energization time of each machine as appropriate. The central transmitter 15 gives an instruction of the energization time to the energization control devices 11, 11' of each machine, thereby centrally controlling the energization time.Next, an example of its operation will be explained using symbols and formulas. First, let the setting value of the amount of hot water used for the next day input into the hot water amount setting device 3 of each '1 water heater 1 be V liters and the hot water temperature T1 degrees Celsius, and the detected value of the water supply temperature sensor 4 immediately after the midnight power supply time starts. t'
Assuming that the detected value of C9 remaining hot water amount sensor 6 is malliter and the detected value of remaining hot water temperature sensor 7 is T2, computing unit 5 is.

It calculates 1cl=(TI-t)xV, and calculates 1 as the thermal calorie that should be stored in the hot water storage tank. Also, the arithmetic unit B8 is.

K2=(τx-t), which performs the calculation of x ma, calculates the thermal calories remaining as residual hot water.

Furthermore, the arithmetic unit 09.

This calculation calculates the required energization time H for each electric water heater from the net heat calories to be applied excluding the heat calories of the remaining hot water (lkwh = 860 kca
l) oHere, W represents the power consumption (kW) of the heating element.

Then, the required energization time determined by the calculator C9 is sent as a signal from the transmitter 10 to the receiver 13 of the central control device 12, and is totaled by the 9-hour distribution control device 14. 7 a.m. the next morning), the power is distributed so that the power load is averaged and sent as a signal from the central transmitter 15 to each machine. The energization controller 11 of each machine is the central transmitter 1
The energization time of the heating element is controlled by the signal from 5. For example, in an apartment building, 20 electric water heaters can each generate a certain amount of electricity by energizing them for 3 hours.
In this case, 10 units would be powered on from 11pm to 2am the next morning, and the others would be powered on from 2am to 5am the next morning, thereby keeping power peaks as low as possible.

As explained above, in the present invention, each of a plurality of storage type electric water heaters is equipped with a hot water amount setting device and boils only the amount of hot water required by the user, so the amount of remaining hot water is reduced and the heated water temperature is also below the set temperature. Since hot water is increasingly stored at low temperatures, various types of heat loss are reduced and maintenance costs are reduced. In addition, since the central control unit performs centralized control so that the power load is averaged, it also has the effect of alleviating peak power loads and improving power transmission efficiency.

[Brief explanation of drawings]

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 body, 3, 3'... Hot water amount setting device, 4, 4'... Water supply temperature sensor, 5
, 5'... Arithmetic unit, 6, 6'... Remaining hot water amount sensor, 7, 7'... Cruel temperature sensor, 8.8
'...Arithmetic unit' * 9 * 9'...Arithmetic unit C;
t 10 , io'--transmitter, 11.11'
... Energization control device, 12... Central control device, 13.
...Receiver, 14...Time allocation control device, 15...
It is a central transmitter. Agent Shin Kuzuno - (1 other person)

Claims (1)

[Scope of Claims] Each of the plurality of hot water storage type electric water heaters includes a hot water amount setting means for presetting the amount of hot water to be used stored in the hot water storage tank, and a water supply temperature detection means for detecting the temperature of the water supplied to the hot water storage tank; a calculation means for calculating the amount of heat to be stored from the set value set by the hot water amount setting means and the water supply temperature detected by the water supply temperature detection means; a residual hot water amount detection means for detecting the amount of hot water remaining in the hot water storage tank; a residual water temperature detection means for detecting the temperature of the remaining water in the tank; a calculation means B for calculating the residual water heat quantity from the supply water temperature, the amount of residual water, and the residual water temperature detected by each of the detection means; and the calculation means M and calculation means. A calculation means C for calculating the required energization time from the difference between the means B, a transmission means for sending the required energization time calculated by the calculation means C as a signal to the central control device, and 9 energization control means; A central control unit equipped with a 9-hour distribution control means and a central transmission means is provided. The receiving means receives the signal of the required energizing time of each machine transmitted by the transmitting means, and the total energizing time is totaled by the 9-hour distribution control means. A control device for a hot water storage type electric water heater, characterized in that it performs centralized control by appropriately allocating the energization time of each machine and giving an instruction of the energization time from the central transmission means to the energization control means of each machine.