JPS58110944A - Hot-water storing type electric water heater - Google Patents

Abstract

PURPOSE:To complete heating of water by feeding a fixed amount of electric power to a heater throughout the entire period of the midnight electric power supply service, by calculating the presumed amount of hot water to be used on the next day, the temperature of supply water, the amount and the temperature of hot water left in a storage tank, etc. CONSTITUTION:The presumed amount Vl (T1 deg.C) of hot water used on the next day is set by use of a means 12 for setting the amount of hot water used steadily or a means 14 for setting the amount of hot water used temporarily. Here, the temperature t deg.C of supply water and the amount vl and the temperature T2 deg.C of hot water left in a storage tank at the time immediately after starting of the midnight electric power supply service are detected respectively by sensors 5, 7 and 8. From the output signals of these sensors 5, 7, 8, an arithmetic means 6 computes the quantity of heat (K1kcal) of hot water to be stored by the time when the midnight electric power service ends, from an equation, K1=V(T1-t), and an arithmetic means 9 computes the quantity of heat (K2kcal) of hot water left in the tank, from an equation, K2=V(T2- t). Further, an arithmetic means 10 computes the required capacity (Pkw) of a heater from an equation, P=(K1-K2)/860. Then, a required current is supplied to the heater throughout the entire period of the midnight power service while controlling the current supply rate to the heater by a current controlling means 11, whereby it is enabled to finish heating of water at the instant when the period of the midnight power service is terminated.

Description

[Detailed Description of the Invention] This invention relates to a hot water storage type electric water heater, which calculates an appropriate heating element capacity from the amount of hot water used, the water supply temperature, and the state of the remaining hot water in the hot water storage tank, and always boils the water in a fixed amount of time. It is intended to do so.

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

3 is an automatic temperature controller, and 4 is a source.

Next, we will explain its function using the general case of using late-night power as an example. 9 Heating element 2 heats water at around 8°C, which corresponds to the water temperature in winter, to about 85°C during the late-night power supply time.
The capacity of the heating element is set to raise the temperature to C.

Furthermore, the automatic temperature controller 3 has a normally closed contact point.9. When the water in the hot water storage tank 1 reaches approximately 85°C, a contact is opened to stop energizing the heating element 2, and the hot water storage tank 1 is filled with hot water at 85°C every morning. There is.

However, the amount of hot water used is not always the same.

The days vary greatly depending on the season. In particular, whether or not a person takes a bath is a factor that greatly influences the amount of company 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 there is any remaining hot water, the electricity will be turned on all at once at midnight and the water will be sifted out in a short time. As a result, the power load is concentrated, making it impossible to equalize the power load, which is the original purpose of late-night power, resulting in poor power transmission efficiency, and the sieved high-temperature hot water not being used for a long time. If left unattended, it has the disadvantage that heat loss increases 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 setting the amount of hot water to be used the next day in advance.

The capacity of the overpressure heating element is calculated from the water supply temperature and the state of the remaining hot water in the hot water storage tank, and when the power is turned on in the middle of the night, the entire time is used to sieve with constant power.

The present invention will be explained below based on the energization control block diagram shown in FIG. In FIG. 5, 12 is a constant hot water amount setting device for presetting the next day's amount of hot water stored in the hot water storage tank 1, and 14 is a provisional hot water amount setting device for similarly setting the amount of hot water for one-time use. On a regular basis, it is set by the constant hot water amount setting device 12, but for example, if you do not take a bath the next day or do not use hot water, the provisional hot water amount setting device 14 is set.
The amount of hot water to be used is set by the operation, and the value set by the steady #h'it setting device 12 is automatically restored two days later.

5 is a water supply temperature sensor for detecting the temperature of water supplied to the hot water storage tank 1, and 6 is the steady hot water amount setting device 12 or temporary hot water amount setting device! This is a calculation unit that calculates the thermal calories of hot water to be stored in the hot water storage tank 1 from the set value set at 1t14 and the detected value detected by the water supply temperature sensor 5.

Reference numeral 1 indicates a remaining hot water amount sensor for detecting the amount of remaining hot water within the hot water storage amount/r1, 8 indicates a remaining hot water temperature sensor for similarly detecting the temperature of remaining hot water in the hot water storage tank 1, and 9 indicates each of the above-mentioned sensors 5.
．． Calculator B is used to calculate the remaining hot water heat calories from each detection value detected in step 7.8.

Reference numeral 10 denotes a calculator C for calculating the required heating element capacity from the difference between the heat calorie calculated by the calculator Muro and the calculator B9, and 11 a calculator for calculating the required heating element capacity calculated by this calculator C. This is a power control device that controls power supply to the heating element 2.

Next, an example of the operation of the above configuration will be explained using symbols and formulas. First, let the next day's amount of hot water input by the steady hot water amount setting device 12 or temporary hot water amount setting device 14 be v liters (hot water temperature 11 degrees), and the detected value of the water supply temperature sensor, sensor 5 immediately after entering the late-night power supply period, be t degrees. , if the detected value of the remaining hot water amount sensor 7 is Malliter, and the detected value of the remaining hot water temperature sensor 8 is T2FIt, then the calculation unit error is.

TLt = (Tt-t) V is calculated, and the thermal calorie Kr (&
Calculate j).

Also, the arithmetic unit B9 is.

Kz=(Tz-t) is calculated, and the thermal calorie Kg(&j) of the amount of hot water remaining in the hot water storage tank 1 is calculated.

The arithmetic unit 010 includes the arithmetic unit Muro and the arithmetic unit B9.
Based on Kt and K2 calculated in , calculate 9t-Ex P = - 60, and calculate the amount of remaining hot water from 1 to the thermal calories of the amount of hot water that should be stored in the hot water storage tank 1 to the thermal power port IJ-
The required heat generation volume 11P (Klil) is calculated from the net heat calories to be applied excluding 2. (1
m = 860&j) Next, the required heating element valley 1tP (deception) is determined by the arithmetic unit (311)
Once calculated, the amount of electricity supplied to the heating element 2 is controlled by the power control device 11Vc, and a predetermined 'power violet is added throughout the late night power supply time period, and #! The sifting is controlled to end at the same time as the 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 power is required for the heating element.

Since the power is always averaged over the entire late-night power supply period, the concentration of power load is alleviated, and hot water is not left in the storage tank 1 for a long time. This can reduce heat radiation loss. Furthermore, the water volume setting.

Since it is possible to select and set the regular one or the temporary one as appropriate, the maintenance cost is also reduced.

In the above operation example, a case was explained in which power is used late at night, but the same effect can be obtained by providing a timer mechanism for inputting a desired time for lifting the sieve for general electric swords.

As described above, this invention is a stationary system for presetting the constant amount of hot water to be stored in a hot water storage tank. II'1, a provisional hot water amount setting means for setting the hot water amount for one-time use, a water supply temperature detection means for detecting the m degrees of water supplied to the hot water storage tank, and the hot water setting means. a calculation means for calculating one calorie of hot water to be stored from the set value and the detected value detected by the water supply temperature detection stage; 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 thermal calories from each detection value detected by each of the detection means; The hot water storage system is equipped with a calculation means C for calculating the required heating element capacity from the thermal calorie content, and a power control means for controlling energization to the heating element so that the required heating element capacity calculated by the calculation means C is added. The temperature of water supplied to the tank, the amount of hot water left in the tank, and the temperature of the remaining hot water are detected to calculate the required heat calories, and from this, the heating element capacity is calculated and energized in an average manner during the energization time frame. Since it is configured so that only the amount of heat calories that matches the amount of hot water is applied, it is possible to equalize the production load and improve the feeding efficiency. In addition, not only can you set the constant amount of hot water, but you can also set the temporary amount of hot water as appropriate, which reduces the amount of remaining hot water each day, improves ease of use, and allows the device to be left in high-temperature water for long periods of time.

This has the effect of reducing various heat radiation losses and lowering maintenance costs.

[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 3 is a diagram of the main electrical circuit diagram of a conventional hot water storage type electric water heater.
The figure shows an energization control block diagram according to the present invention. 11Ii hot water storage tank, 2 is a heating element, 5 is a water supply temperature sensor, 6 is a computing unit, 7 is a remaining hot water amount sensor - 18 is a remaining hot water temperature sensor, 9 is a computing unit B, 10 is a computing unit c, 11 is a power control 12 is a steady hot water amount setting device, 14 is a temporary hot water amount setting device. Representative Shin Kuzuno - (1 other person)

Claims (1)

[Claims] A constant hot water amount setting means for presetting the amount of regularly used hot water stored in the hot water storage tank, a provisional hot water amount setting means for setting the same amount of hot water for one-time use, and a water supply temperature for detecting the temperature of water supplied to the hot water storage tank. a detection means, a calculation means for calculating the thermal calories of the amount of hot water to be stored from the set value set by the steady hot water amount setting means or the provisional hot water amount setting means and the water supply temperature detected by the water supply temperature detection means, and a hot water storage tank. a remaining hot water amount detecting means for detecting the amount of remaining hot water in the hot water storage tank, a remaining hot water temperature detecting means for detecting the temperature of the remaining hot water in the hot water storage tank, and a calculating means for calculating the remaining hot water thermal calories from each detection value detected by each of the above-mentioned detecting means. B, a calculation means G that calculates the required heating element capacity from the difference in heat calories calculated by the calculation means M and calculation means B, and a calculation means G that calculates the required heating element capacity calculated by the calculation means C to the heating element so that the required heating element capacity calculated by the calculation means C is added to the heating element. A hot water storage type electric water heater comprising a power control means for controlling energization of the water heater.