JPS58124147A - Controlling apparatus of hot water storage type electric water heater - Google Patents

Abstract

PURPOSE:To reduce the radiation loss by a method wherein the required hour to energize to a heating element is calculated based upon the feed water temperature and the energizing is started in the midst of midnight power supply time zone so as to expire the required energizing hour at the time of expiration of midnight power supply time zone. CONSTITUTION:The required energizing hour H is calculated by means of an arithmetic unit 11 based upon the feed water temperature t deg.C detected by a feed water temperature sensor 10, the rated heating-up temperature T deg.C, the capacity Vl of a hot water storage tank and the rated consumption electric energy Wkw of the heating element from the following relationship: H=(T-t)V/ 860W. Furthermore, the energizing to the heating element 2 is started by means of a timer unit 12 in the midst of midnight power supply time zone so as to expire the required energizing hour simultaneously with the expiration of midnight power supply time zone.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a hot water storage type electric water heater that uses late-night electricity, and detects the temperature of the water supply and calculates the required energization time to the heating element, and simultaneously detects the temperature of the supplied water and calculates the required energization time to the heating element. The purpose is to start energization in the middle of the late-night power supply period so as to obtain the above-mentioned required time, and to reduce heat dissipation loss after raising the power.

Figure 5g1 is a configuration diagram of a general hot water storage type water heater.
The figure shows the main electrical circuit diagram of a conventional hot water storage type electric water heater. In FIG. 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. In addition, in Fig. 2, 6 is a power supply, 7 is a time switch, and 8 is a power supply.
is an automatic temperature A moderator.

Next, we will explain the operation when using late-night power, which is generally done. The heating element 2 generates water at a temperature of about 8°C, which corresponds to the water temperature in winter, at about 85°C during the late-night power energization time set by the time switch 7. The capacity of the heating element is set in advance to raise the temperature to °C. The automatic temperature control 68 has a normally closed contact, and is configured to open the contact and stop supplying electricity to the heating element 2 when the water in the hot water storage tank 1 reaches 85°C. 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 always the same.

It varies from day to day and largely from season to season. In particular, whether or not you take a bath is a key factor that greatly influences the amount of hot water you use.9.
On days when you don't take a bath, you end up with more than half of the hot water remaining. Additionally, depending on the season, the temperature of the water supply greatly affects the amount of hot water that can be extracted, and in the summer when the water temperature is high, a larger amount of hot water can be extracted than in the winter. However, the amount of hot water used remains the same throughout the year, or rather, because hot water is used at a lower temperature in the summer, the actual amount used generally decreases, and the amount of hot water remaining in the summer increases.

When there is a large amount of hot water remaining in this way, there are disadvantages in that the hot water reaches the line in a short time, so it has to be left for a long time, and heat loss due to natural heat radiation from the hot water storage tank 1 increases.

The present invention aims to eliminate these drawbacks, and the present invention detects the temperature of water supplied to the hot water storage tank, calculates the required energization time to the heating element, and obtains the required energization time at the end of the midnight power supply. By starting energizing the heating element in the middle of the late-night power supply period, it is intended to eliminate as much as possible heat radiation loss after the wire is raised.

The nine-issue BA will be explained below based on the block diagram shown in FIG. In FIG. 5, 10 is a water supply temperature sensor for detecting the temperature of water supplied to the hot water storage tank 1, and 11 is a calculation unit that calculates the required energization time to the heating element 2 from the water supply temperature detected by the water supply temperature sensor. Reference numeral 12 denotes a timer device that operates to start energizing the heating element 2 from the middle of the late-night power supply period so that the predetermined power supply time calculated by the arithmetic unit 11 is obtained at the end time of the late-night power supply.

Next, an example of its operation will be explained using symbols and formulas.
Now, the temperature on the rated line is T'C, and the capacity of hot water storage tank 1 is v
If the detected value of the water supply water temperature sensor 10 immediately before the start of energization is t-C, the calculator 11 calculates H=(T-t)XV÷860÷W (time), and the required energization time 11 is It is calculated.

(1 liter = 860&j). Here, W represents the rated power consumption (Kl) t'' of the heating element 2.The timer device 12 turns off the power to the heating element 2 at midnight so that the required energization time determined by the calculator 11 is obtained at the end of the midnight power application. Start from the middle of the power supply time period.

As described above, the device according to the present invention is configured to calculate the required energization time to the heating element from the water supply water temperature and create a timer device so that the line reaches the end time of the midnight power energization time. This has the effect of reducing the amount of time left unused, reducing heat radiation loss from the hot water storage tank 1, and lowering maintenance costs. Furthermore, the device according to the present invention is energized during the latter half of the late-night power energization period.

By mixing it with existing products, it is possible to level out the power load9. It also has the effect of improving power transmission efficiency.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a general hot water storage type water heater, and Figure 2 is a main power supply circuit diagram of a conventional hot water storage type water heater. FIG. 3 is a block diagram of energization control according to the present invention. 1 is a hot water storage tank, 2 is a heating element, 10 is a water supply temperature sensor, 11 is a computing unit, and 12 is a timer device. Agent Shin Kuzuno - (1 other person)

Claims (1)

[Claims] a water supply temperature detection device that detects the temperature of water supplied to the hot water storage tank; a calculation device that calculates the required energization time to the heating element from the temperature of the water supply detected by the water supply temperature detection device; A control device for a hot water storage type electric water heater, comprising: a timer device that starts energizing the heating element in the middle of the late-night power energization time period so as to obtain the required energization time determined in .