JPS58129132A - Controller for hot water reserving type electric water heater - Google Patents

Abstract

PURPOSE:To enable to heat up in a fixed time always, by calculating appropriate heating unit capacity based on temperatures at the upper and lower parts of the inside of a hot water reservoir and a condition of residual not water. CONSTITUTION:A lower part temperature, a residual hot water quantity and an upper part temperature are redetected by detectors 9, 10 and 11 respectively, necessary heating unit capacity is reset through each operation by each of arithmetic units A 12, B 13 and C 14, and electrification capacity to a heating unit 2 is controlled by an electric power controller 15 so that heating up is done simultaneously with completion of an electrification time for midnight electric power. Then, as for the heating unit 2, the larger the residual hot water quantity in a hot water reservoir 1 becomes and the higher a residual hot water temperature in the hot water reservoir becomes, the fewer necessity of electric energy becomes, and it is equalized so as to add extending over the whole of the electrification time for the midnight electric power, then a radiation loss can be reduced as concentration of an electric power load immediately after starting of electrification is alleviated and very hot water is not left in the hot water reservoir for a long period of time as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a hot water storage type electric water heater, which calculates an appropriate heating element capacity from the upper and lower parts of the hot water storage tank and the state of the remaining hot water, etc. FIG. 1 is a block diagram of a general storage-large electric water heater, and FIG. 2 is a conventional main WL air circuit diagram. In Figure 1, 1 is a hot water storage tank, 2 is a heating element,
3 is a water supply pipe, 4 is a hot water supply pipe, and 5 is a cock. Also the second
In the figure, 6 is an "It source, 7 is a time switch, and 8 is a self-IIB temperature 1I14 moderator.

Next, to explain the operation of the conventional system using the commonly used late-night power as an example, the heating element 2 is heated to a temperature of around 8°C, which corresponds to the water temperature in winter, during the late-night power supply time by Time Switch F7. The heating element capacity is preset to boil water to about 85°C. In addition, the self-1Ib one-way switch 8 contains a normally closed contact, and when the water in the hot water storage tank 1 reaches 85°C, the contact opens and the connection to the heating element 2 is established.
- configured to stop.

The hot water storage tank 1 is filled with hot water at 85°C every morning.

However, the amount of hot water used is not necessarily the same as wealth, and varies greatly depending on the season. In particular, whether or not a person takes a bath greatly affects 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 remains.

Therefore, if there is any remaining hot water, the electricity will start all at once when the late-night electricity is turned on, and the water will boil in a short time. As a result, power load congestion occurs in the first few hours after power is started, making it impossible to equalize the power load, which was the original purpose of late-night power, and causing problems with power transmission efficiency. Do not leave boiled hot water unused for a long time.
This has the drawback of increasing heat loss due to natural heat radiation from the hot water storage tank 1 and heat radiation from hot water stagnant in the piping.

This invention attempts to solve these conventional drawbacks by calculating the appropriate heating element capacity from the temperature of the water supply a [and the upper and lower parts of the hot water storage tank], the state of the remaining hot water, etc.
In this system, boiling is performed with a constant power using the entire energization time of late-night power, and after a predetermined period of time has elapsed from the start of energization, the capacity of the heating element is reevaluated and boiling is started.

The present invention will be explained below based on the energization control block diagram shown in FIG. In FIG. 3, reference numeral 9 indicates a rounded lower temperature detection device for detecting the lower temperature f of the hot water storage tank 1; 1 is a calculation device for calculating the thermal calorie of hot water to be stored in the tank 1; 10 is a remaining hot water amount detection device for detecting the remaining amount of hot water in the hot water storage tank 1; 11 is also the upper m of the hot water storage amount/r1 [Upper temperature detection #I for detecting, 13 is each of the above-mentioned detection devices!
i, 1t) and 11 respectively detected at the bottom @[,
This is an arithmetic device B for calculating the remaining hot water heat calories from fi hot water amount and upper@11f.

14 is a rounding arithmetic unit 0 that calculates the required heating element capacity from the difference in thermal calories calculated by the arithmetic unit 12 and the arithmetic unit 1113; The passage to the heating element 2 is
This is a power control device that controls the

Next, an example of the operation of the above configuration will be explained in detail using symbols and formulas. First, assume the hot water storage capacity of hot water storage tank 1 tv liters (hot water temperature Tt”c).

Lower part temperature detection device i9 immediately after the late-night power rush hour
The detected value of t''C9IA#h is the detected value of the amount detecting device 10, and the detected value of the upper temperature detecting device 11 is T!”C
Then, in the procedure shown by the solid line in FIG.
is the heat calorie that should be stored in hot water tank 1 by the end of the midnight power supply time! Calculate.

[=〈T X - t) Since the amount of water used is flowing into the F' portion of the hot water storage tank 1 from the water supply -'13, the temperature is almost equal to the temperature of the water supply. Although the water supply temperature varies seasonally, it shows almost the same vtht on a daily basis.

In addition, the calculation device 813 calculates the thermal calories remaining as residual hot water in the hot water storage tank 1 by 2.

Ks = (Tz-t) xma (-) where,
The detection 1 straight 8°C by the upper temperature detection M12 measures the upper temperature Jf'ft in the hot water storage tank 1, but if there is residual hot water, it becomes the residual dh hot water temperature.

The arithmetic unit 1014 calculates the thermal calorie [1 calculated in the above-mentioned calculation 12 and the calculation unit B13 calculates the thermal power a ly-tst-jitK (jct-1cg) ÷
860 calculations are performed, and the thermal calories that should be stored in the hot water storage tank 1 are calculated from 1 to the thermal calories of the remaining hot water jc! f: net thermal power to be impressed by wt a +7- to p per unit time
This is to calculate the required heating element capacity (decade) for (1 line =
860&ll). Next, when the required heating element capacity (Ill) per unit time is calculated by the arithmetic unit 014, the power control device 15 controls the amount of electricity supplied to the heating element 2, so that a predetermined amount of electricity is maintained throughout the late-night power supply time period. is added.

Boiling is controlled to end at the same time as the late-night power supply time ends. ◎ The power supply under the above control continues for a predetermined time, that is,
The lower temperature, the amount of remaining hot water, and the upper temperature are re-detected by each of the detection devices 9.10 and 11, and after each calculation 1 is performed by each calculation device, fi, 0, 12t, and 13.14,
The required heating element capacity is reset, and the power control device 15 controls the current supply capacity to the heating element 2 so that the heating occurs at the same time as the late-night power supply time ends. Therefore, the greater the amount of hot water remaining in the hot water storage tank 1, and the higher the temperature of the remaining hot water, the less electric power is required for the heating element 2, and the more electricity is required for the heating element 2, the more electricity is required throughout the entire area of late-night electric power. This reduces the concentration of power load immediately after the start of two energizations, and also reduces heat dissipation loss because hot water is not left in the hot water storage tank for a long time.

In addition, each detection device is inspected again and the current carrying capacity is reviewed after a predetermined period of time has passed since 9 energization has started, so the late-night power energization start time (generally 25:00)
Even if the hot water is subsequently used for bathing, etc., the capacity of the heating element can be increased through this examination, and there is no need to worry about insufficient boiling.

In the above operation example, the case of using late-night power has been described, but the same effect can be obtained even if a timer mechanism or the like is provided to manually set the desired boiling time for general use.

As mentioned above, this invention is the first step in the hot water storage system! lsm
A lower temperature detection device that detects &, and this lower S temperature detection i
A computing device that calculates the thermal calories of hot water to be stored from the S temperature below the hot water storage tank detected by i&Direct and the capacity of the hot water storage tank, a residual hot water amount detection device that detects the amount of hot water remaining in the hot water storage tank, and a hot water storage device. an upper temperature detection device that detects the upper temperature in the tank; a calculation device tB that calculates the remaining hot water heat calories from the lower temperature, remaining hot water amount, upper temperature, etc. detected by each of the front and back detection devices; an arithmetic device C that calculates the required heating element capacity from the difference in heat calories calculated by the device 1B; and an arithmetic device C that controls the power flow to the heating element so that the required heating element capacity calculated by the arithmetic device 0 is added. ! I
This is because it is configured to calculate the required heat calories according to the condition of the upper and lower parts of the hot water storage tank and the remaining hot water, and to calculate the necessary heat calories according to the state of the remaining hot water and to average it for 9 energization times before energizing. ,
This makes it possible to level out the power load, improve the efficiency of withdrawal, and eliminate the need for high-temperature hot water to be left in the hot water storage tank for long periods of time, reducing various heat dissipation losses and lowering maintenance costs. have.

In addition, if the current capacity to the 9 heating elements is set to -1 and hot water is used for bathing after the starting time of the 9th heating element, the top and bottom of the hot water storage tank will be re-opened after a predetermined period of time. Since it is configured to re-measure the temperature, hot water amount, etc. and reset the heating element capacity, it has the effect of resolving the insufficient heating even in this case.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a general hot water storage type electric water heater, Figure 2 is a main electrical circuit diagram of a conventional hot water storage type electric water heater, and Figure 5
The figure shows an energization control block diagram according to the present invention. 1 is a hot water storage tank, 2 is a heating element, 9 is a lower S temperature detection device,
10 is a remaining hot water amount detection device, 11 is an upper temperature detection device, 12
, 13.14 is operation! 1lIt. 15 is a power control device. Agent Shin Kuzuno - (1 other person) Fang 11 3 2nd rM, 78 Figure 3

Claims (1)

[Claims] A lower temperature detection device that detects the temperature of the lower portion of the hot water storage tank, and a calculation device that calculates the thermal calories of the amount of hot water to be stored from the hot water storage tank capacity and the lower temperature detected by the lower temperature detection device. A remaining hot water amount detection device detects the amount of remaining hot water in the hot water storage tank, an upper temperature detection device detects the upper temperature in the hot water storage tank, and a front ffi ratio detection device detects the lower temperature, the amount of remaining hot water, and the residual hot water heat from the upper s11 & a calculation device B that calculates calories; a calculation device 0 that calculates the required heating element capacity from the difference in heat calories calculated by the calculation device M and calculation device B; and a power control device that controls energization to the heating element so that the power supply is added to the trough configuration a at the start time of the late-night power supply.
tt to set the heating element capacity, and 9. After a predetermined time has elapsed from the start of energization & KPk degree each configuration f! 1. A control device for a hot water storage type electric water heater, characterized in that the heating element capacity is reset by being installed in the device.