JPS58129146A - Hot water reserving type electric water heater - Google Patents

Abstract

PURPOSE:To reduce the expense of maintenance by reducing various kinds of radiation losses, by a method wherein a necessary electrification time is calculated by referring a detected value of a quantity and a temperature of residual hot water in a hot water reservoir, and electrification is started in the midway of a midnight electrification time so that the above necessary electrification time can be consumed at a completion of the midnight electrification time. CONSTITUTION:If hot water reserving capacity of a hot water reservoir 1 is V liter (hot water temperature: T1 deg.C), correcting temperature, such as a fixed supply water temperature immediately after an inrush into a midnight electrification time and the lowest annula temperature for various places is t deg.C, a detected value of a water is T2 deg.C, a calorific value K1[K1=(T1-t)X V]which is to be stored within the hot water reservoir 1 by a completion time of electrification for midnight electric power is calculated by an arithmetic unit A 12. Then, a calorific value K2[K2=(T2-t)XV]to be remained in the hot water reservoir 1 as residual hot water is calculated by an arithmetic unit B 13. Operation of an equation (K1-K2)divided by 860divided by W is done by an arithmetic unit C 14 based on the K1 and K2 calculated by the arithmetic units A 12 and B 13 respectively, and a necessary electrification time is calculated by a net calorific value (1kWH=860kcal) to be applied which is obtained by deducting a calorific value corresponding to residual hot water. Electrification to a heating unit 9 is started by a timer 15 from the midway of a midnight electrification time so that the necessary electrification time calculated by the arithmetic unit C 14 can be obtained by a completion time of midnight electrification.

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to propose a device that reduces heat loss by starting electricity supply from a hot water storage type electric hot water supply that utilizes late-night electricity.

Figure 1 shows the main power supply circuit of a conventional hot water storage type electric water heater that uses late-night electricity. In the figure (11 is the power supply, f21
tj The time switch for late-night power is generally turned on from 11 p.m. to 1 a.m. the next morning. (3) is a heating element, and the capacity of the heating element is set so that water at around 8°C, which corresponds to winter water temperature, can be heated to 85°C within two energizing hours.

(4) is an automatic temperature controller and has normally closed contacts.

When the temperature of the water in the hot water storage tank reaches 85°C, the contact opens.

Next, the function and operation will be explained. When it is time for the power to start flowing in the middle of the night, the time switch (contact 21) closes.

Power to the heating element (31) is started. When the temperature of the hot water in the hot water storage tank reaches 85° C., the contact of the automatic temperature regulator (4) is opened (and the power to the heating element (31) is stopped.

Time switch (210 heating element (3) in full energization time frame
There is almost no possibility that the power will be energized. In this way, the entire amount of stored hot water is boiled to 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 a person takes a bath is a factor that greatly influences the amount of hot water used.
On days when you don't take a bath, you end up with more than half of the stored hot water. Additionally, depending on the season, the temperature of the water supply has a large effect on the amount of hot water that can be extracted, and a larger amount of hot water can be extracted in the summer when the temperature of the water supply is higher than in the winter. However, the amount of hot water used is generally constant throughout the year, or in fact, the actual amount used is generally lower in the summer because hot water is used at a lower temperature.
There is a lot of leftover hot water in the summer.

Leaving hot water at such high temperatures unused for long periods of time has the disadvantage of increasing heat loss due to natural heat radiation from the hot water storage tank and heat radiation from hot water stagnant in the pipes. Ta.

The present invention aims to solve these drawbacks by calculating a predetermined energization time based on the detected values of the amount of remaining hot water in the hot water storage tank and the amount of remaining hot water 1, and ending the required energization time by the time when energization ends in the middle of the night. By starting energization in the middle of the late-night energization time period, the wire is heated up more than necessary.

The present invention will be explained below based on the block diagram shown in FIG. In FIG. 2, reference numeral 0) is a calculation device that calculates the thermal calories of hot water to be stored in the hot water storage tank from the capacity of the hot water storage tank and the like.

QIU is a residual hot water amount detection device that detects the amount of hot water remaining in the hot water storage tank, Qυ is a residual hot water amount detection device that also detects the remaining hot water 11K in the hot water storage tank, and (2) is a detection device for each of the above! This is an arithmetic device B for calculating the remaining hot water thermal power port IJ - from the remaining hot water amount and the remaining hot water temperature detected by 1iillolJ and oυ, respectively.

Mouth/ha! ! Ik2 arithmetic unit A Q2 and arithmetic unit i B
The calculation device C calculates the required energization time from the difference in thermal calories obtained in step 03. αS is the heating element (
9) is a timer device for starting energization.

Next, I will explain in detail the operation and falsehood of the above-mentioned model using symbols and formulas. The hot water storage tank (11) has a hot water storage capacity of V13 (hot water temperature T1℃).

Scheduled water supply temperature immediately after the late-night power supply period begins.

The corrected temperature (preset in advance) such as the annual minimum temperature in each region is t℃ (for example, 5℃), the detected value of the residual hot water amount detection device is V liters, and the detected value of the residual hot water temperature detection device Qll is 12℃.
Then, the computing device 0 calculates the amount of hot water stored/(11) by the time when the late-night power supply time ends.

In addition, the calculation device B113 calculates 2 (K2 = (T2-
t) Calculate X v ). and arithmetic unit CQ4
1 is calculated using the calculation device mentioned above and is calculated as 1! ! 1I
Calculated using IBQ3 and based on 9 to 2 (K1-K2)÷11
It performs the calculation ÷W.

The required energization time is calculated from the net heat calories to be applied, excluding the heat calories for the remaining hot water (I Kwh
= a, 4BOx cag. Here - t'wu heating element (
9) represents the power consumption (KW). The timer device starts energizing the heating element (9) in the middle of the late night energization period so that the required one hour calculated by the arithmetic unit IT O14 can be obtained at the midnight energization end time.

As described above, the device according to the present invention is equipped with a hot water amount setting means and adds only the required amount of heat for the kneader (1:1), so the amount of remaining hot water is reduced and the local hot water temperature is also kept at a low temperature of 85°C or less. This has the effect of reducing various heat radiation losses and lowering maintenance costs.

In addition, since the device according to the present invention is energized during the latter half of the late-night energization period, when used in combination with a conventional electric water heater whose load is concentrated in the first half, it can alleviate the peak power load in the first half of the energization period. This also has the effect of improving power transmission efficiency.

[Brief explanation of drawings]

FIG. 1 is a main power supply circuit diagram of a conventional hot water storage type water heater, and FIG. 2 is an energization control block diagram according to the present invention. (9) is the heating element, aO is the remaining hot water amount detection device, and aυ is the remaining hot water temperature detection i! Place, a2. α3. α-ke calculation device, aS is a timer device. Agent Shin Kuzuno - Figure 1 Figure 12/1

Claims (1)

[Scope of Claims] A computing device that calculates the thermal calories of the amount of hot water to be stored from the capacity of a hot water storage tank, a remaining hot water amount detection device that detects the amount of hot water remaining in the hot water storage tank, and a remaining hot water amount k that detects the amount of hot water remaining in the hot water storage tank. A remaining hot water temperature detection device to detect and the amount of remaining hot water detected by the detection device. A calculation unit [B and
A calculation device c that calculates the required energization time from the difference in thermal calories calculated by the calculation device B and the calculation device B; A hot water storage type electric water heater equipped with a timer device for starting energization.