JPS58129140A - Controller of hot water reserving type electric water heater - Google Patents

Abstract

PURPOSE:To alleviate the peak of an electric power load, by a method wherein a device which is capable of presetting a hot water quantity to be consumed is provided on each of a plurality of hot water reserving type electric water heaters so as not to heat up the hot water quantity more than it is required and an electrification load is distributed evenly by a central controller. CONSTITUTION:Hot water reserving type electric water heaters 1 and 2 are provided respectively with hot water quantity setting devices 3 and 3' which preset hot water quantity to be consumed, calorific value detecting devices 4 an 4' for residual hot water which detect the calorific value of the residual water in a hot water reservoir and timers 5 and 5' for setting an electrification time to heating units 6 and 6'. The central controller 7 which is provided with No.1 and No.2 arithmetic units 8 and 9 and a timer controller 10, and the timer controller 10 sends a signal to the timers 5 and 5' of each of the electric water boilers 1 and 2 and controls electrification time of the heating unit 6 and 6' of each of the electric water boilers 1 and 2 by distributing a necessary electrification time to each of the electric water boilers 1 and 2 obtained by the above No.2 arithmetic unit 9 so that its electric power load is equalized in the electrification time for a midnight electric power.

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 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 heating element has been adjusted to match the winter conditions when hot water consumption is high, so that the water temperature is 5 to 50% within 11 hours when the power is turned on. The setting is such that the water temperature reaches about 85°C after boiling from 10'C. For this reason, in summer when there is little use of hot water, more than half of the hot water often remains in the hot water storage tank. In this case, when the late-night power supply time arrives, power supply starts all at once, and the power builds up in a short period of time. This leads to a concentration of electrical loads, resulting in poor power transmission efficiency, and the scales are left unused for long periods of time with high-temperature water.

There were also some missing pickles that had a large heat loss.

This invention was made in view of the above points.

Each of the multiple hot water storage type electric water heaters is equipped with a device that allows you to preset the amount of hot water used to prevent them from boiling up more water than is necessary, and the central control device evens out the load from time to time.
By allocating it to #, the above-mentioned conventional drawbacks are solved.

The following is a control block diagram (lit 1 diagram) of an embodiment of this invention.
This will be explained by K. (11, (21 is the main body of the hot water storage type electric water heater), each includes a hot water amount setting device for presetting the amount of hot water used + 31. Detection means (41, (4
'), 1 heating element +61, and a timer device for setting the energization time for (4') +51. (s')fr
I'm getting angry. (7) is a central control unit which includes first and second computing units +81. +91. It is equipped with a timer control device -, and the first computing unit ((rotation) is the hot water amount setting device + 3
1. Calculate the heat calories to be stored in each electric water heater from each set value in (5'). In addition, a second computing unit (9) calculates each electric hot water based on the difference between the heat calorie calculated by the first computing unit (8) and the remaining water heat calorie detected by the remaining water heat quantity detection means (41, (4')). r9 to vessel (!1.υ)
ri! This is to calculate the energization time. And the timer control device exposure is P9r? to each electric water heater fil, +21 determined by the second computing unit (9). A timer device for each electric water heater (1), (2) is distributed so that the power load is averaged during the late-night power supply period.
ffil, (s'), each electric water heater +
11. (2+ heating element fsl, (6') conduction time l1II11+).

Next, an example of its operation will be explained using symbols and formulas. First, set the setting value of the next day's amount of hot water input to the hot water amount setting device (3) of each electric water heater (!1) at v liters and hot water temperature T1℃.
The corrected temperature (preset) is the constant supply water temperature immediately after the midnight power supply time starts, the annual minimum temperature in each region, etc.
If tt (for example, Fi5℃), the first arithmetic unit (8)
teeth.

('r1-t)xv is calculated, and the thermal calorie Km (K1=(TI-t)xV) that should be stored in the hot water storage tank is calculated.

The second computing unit (9) performs the calculation (K1-2)÷860÷W, and calculates the Tg to each electric water heater from the net heat calories to be applied, excluding the heat calories for the remaining hot water. This is to calculate the energization time (1Kvh = 8 @
OKcal ), where W is the heating element (61, (4'
2 represents the power consumption (Kw) of ), and 2 represents the residual hot water heat calorie detected by the residual hot water heat amount detection means.

Then, the timer control device a.
) for each electric water heater (11, (11 heating elements (6)
.

The required energization time to (6') is the late-night power energization time (23
The timer device (11, (2) of each electric water heater (11, (2)) is distributed so that the power load is averaged in
5), (5') Send K signal, each heating element +6), (
4') conducts energization time control. For example, if two electric water heaters can each be powered for 3 hours to obtain the specified amount of electricity, one unit should be powered on from 11pm to 2am the next morning, and the others should be powered on from 2am to 5am the next morning. conduct.

This is an attempt to keep the power peak as low as possible.

Note that the residual water heat amount detection means +41. As (4'), there is a shank as shown in Figs. 2 to 4. That is, FIG. 2 is a structural sectional view of the hot water storage type water heater, and FIGS. 3 and 4 are temperature distribution diagrams inside the hot water storage tank.

In Fig. 2, (10 is a hot water tank, (102) is a temperature sensor installed at the bottom of the hot water tank (tol) to measure the temperature of hot water in the hot water tank (201), and (1OS) is a water supply pipe. , (10 is the hot water pipe, (1os) is the faucet installed at the tip of the hot water pipe. (106) is the all pump.

One end is attached to the lower part of the hot water storage tank (101), and the other end is attached to the hot water supply pipe (104).
) is provided in the middle of a communication pipe (107) connected to the middle of the hot water storage tank (10), and circulates water from the lower part of the hot water storage tank (10) to the connection part with the hot water supply pipe (104).

Next, the operation will be explained. Initially, hot water at t1℃ is stored in the hot water tank (101
) is satisfied (Figure 2). In this state, the faucet (tO
Hot water storage tank (101) after using hot water from S) to vl(4)
Figure 3 shows the temperature distribution. Lower part of hot water storage m (
101) The arc used #hii v 1 (t2 ('CI water flows in from the water supply pipe (103) by the amount of force.

The upper part of the hot water storage tank (1 (N) bic is tt ('cl hot water is v2
(4 remains. In this state, when the faucet (1OS) is closed and the circulation pump (106) is operated, water from the lower part of the hot water tank (+O1) a flows in from the upper part of the hot water tank (1 [11) b) and the water is stored. Upper part of the tank (101) 9 to disturb the hot water layer b
The water temperature gradually becomes average. Hot water tank with average hot water temperature (101
) is shown in Figure 4, which shows the average temperature at t3°C.

Next, we will explain how to calculate the residual heat amount. If the total capacity of the hot water storage tank (101) is vs(jJ (eigenvalue vs=vt+vz), then the temperature sensor (1
The temperature measured before operation of the circulation pump (to6) by 02) is t2('C1, and the temperature measured after operation of the circulation pump is ts('
Since it is Cl, the remaining heat value of 2 (Kcal) can be calculated using a calculator as follows.

K2=vsx (J - t2) (Kcal) As the residual hot water heat amount detection means (4+, (4')), there are those described above.

Dad, electric hot water! +11. (From 21 to the central control unit (θ
) and vice versa, transmission of each signal to transmitters in, uz and receivers 0, . It goes without saying that α- may also be used.

As explained above, in the present invention, each of the plurality of storage type electric water heaters is provided with a hot water amount setting device to boil only the required amount of hot water.

Not only does the amount of remaining hot water decrease, but the boiling water temperature is also increasingly stored at a low temperature of 85° C. or lower, which has the effect of reducing various types of hot water and lowering maintenance costs. In addition, since centralized control is performed so that the power load is averaged, the peak of the power load is alleviated, which also has the effect of improving power transmission efficiency.

[Brief explanation of the drawing]

FIG. 1 shows a hot water storage type electric hot water system 10 which is an embodiment of the present invention.
The control block diagram, FIGS. 2 to 4 are diagrams showing an example of the residual water heat quantity detection means, and FIG. 2 is a structural cross-sectional view of the hot water storage type water heater.
3 and 4 are temperature distribution diagrams inside the hot water storage tank, and FIG. 5 is a control block diagram showing another embodiment of the present invention. 111, +21... electric water heater body, t3g,
(S')...Hot water amount setting device, +41. (4'
)--Residual hot water heat detection means, +51. (5')...
Timer device, +61. (6') ... heating element,
(8)...First computing unit, (9)...Second computing unit, +IQ...Timer control device. Figure 2 113 Figure 4

Claims (1)

[Scope of Claims] Each of the plurality of hot water storage type electric water heaters includes a hot water amount setting device for presetting the amount of hot water to be used, a residual water heat amount detection means for detecting the thermal calories of the remaining water in the hot water storage tank, and a zero heating element. In addition to providing a timer device for setting the energization time, a central control device equipped with a first and second computing unit and a timer control device is provided, and each electric hot water is The first calculation unit calculates the heat calories to be stored in the water heater, and the difference between the heat calories calculated by the first calculation unit and the remaining water heat calories detected by the residual water heat amount detection means is used to calculate the heat calories to each electric water heater. Calculate the power difference between the two using the second calculator. Hot water storage type electric hot water 1 characterized in that the timer device of each electric water heater is centrally controlled by the timer control device so that the required energization time to each electric water heater is distributed appropriately.
0 control device. Child +14-