JPS60207849A - Control device of hot water storage type electric heater - Google Patents

Abstract

PURPOSE:To eliminate the needs for a plurality of sensors on the inner surface side of a hot water storage tank and consequently prevent rusts from generating by performing necessary processings on the inner surface of the hot water storage tank by a method wherein a feed water temperature is calculated by use of the amount of hot water consumed, the energizing hour of a heat generating body and the heat quantity necessary for user and the required energizing hour is calculated by use of said feed water temperature and the amount of hot water consumed in order to control the heat generating body. CONSTITUTION:A block 13 memorizes the amount of feed water supplied on the previous day through a flow meter 11 into a hot water storage tank 1, the energizing hour of a heater 3 on the previous day and the heating-up temperature on the previous day. A block 14 calculates the feed water temperature from the data memorized in the block 13. A block 15 calculates the required energizing hour of the heater 3 for heating the amount of hot water to be consumed on the following day by employing the feed water temperature calculated by the block 14 as the feed water temperature on the day. However, said amount of hot water to be consumed employs the value of said flow meter 11 on the day. Thus, the energizing to a heat generating body (b) is controlled through a controlling means (e).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a hot water storage type electric water heater that utilizes late-night electricity.

(Prior art) Conventionally, in hot water storage type electric water heaters that use late-night electricity,
There is a control device that detects the amount of hot water left and saves power during the night (for example, see Japanese Patent Laid-Open No. 87737/1983).

However, in this type of control device, a plurality of five temperature sensors are provided on the inner surface of the hot water storage tank by drilling a hole in the hole that covers the inner surface of the hot water storage tank. and 1
These temperature sensors detect the amount of remaining hot water, the temperature of the water supply, and the like.

By the way, rust that occurs in the hot water storage tank is often a factor that shortens the life of a hot water storage type electric water heater, and as mentioned above, machining the hollow part on the inside of the hot water storage tank is undesirable because it causes rust to form. .

(Object of the Invention) In view of the above, the present invention reduces the number of sensors installed on the inner surface of the hot water storage tank, prevents the occurrence of rust due to processing of the inner surface of the tank as much as possible, and saves late-night electric power. The purpose of this invention is to provide a control device for a device.

(Structure of the Invention) As shown in FIG. 1, the structure of the present invention is to calculate the amount of hot water detected by the hot water consumption amount detecting means a, the energization time to one heating element, and the amount of heat required by the user. A calculation means C calculates the water supply temperature, and a second calculation means d calculates the required energization time using the water supply temperature and the amount of hot water consumed, and controls the energization to the heating element via the control means e. It is made to be.

(Example) The configuration of the present invention will be described below with reference to the drawings in terms of two examples.

FIG. 2 shows a control device for a hot water storage type electric water heater according to the present invention.
．． and a heater 3 are provided, and the thermistor 2 is connected to a microcomputer 4. On the other hand, the output side 5 of the microcomputer 4 is an output interface circuit 6.
A relay 7 is connected via.

In the figure, 8 is a late-night power supply, 9 is a water supply pipe, and 10 is a hot water supply pipe. A flowmeter 11 is provided in the middle of the water supply pipe 9, and the flow rate value measured by the flowmeter 11 is input to the microcomputer 4. It is made to be done. Further, a display 12 for displaying the flow rate value is attached to, for example, a control panel (not shown) of the electric water heater provided indoors. Note that the flow meter 11 may be provided on the hot water supply pipe 10 side.

The microcomputer 4 receives the value of the flowmeter 11 measured the previous day, calculates the temperature of the water supply, and uses the value of the flowmeter 11 measured that day and the water supply temperature to operate a heater for boiling the amount of hot water to be consumed the next day. In addition to calculating the required energization time (HO) of step 3.

The time to start energizing the heater 3 is determined. Further, the thermistor 2 detects the boiling temperature (1) after the required energization time (HO) has elapsed and inputs it to the microcomputer 4. Next, the processing procedure performed by the microcomputer 4 will be explained along with processing blocks 13 to 18.

13 is a memory block, which is the flowmeter 11;
The amount of water supplied into the hot water storage tank 1 through the previous day,
In other words, the amount of hot water (V
2), the energization time (Hl) of the heater 3 in LJ on the previous day, and the boiling temperature (t) on the previous day.

Block 14 is the consumed hot water stored in block 13! (V2) and energization time (Hl).

Calculate the water supply temperature (X'C) of the previous day using the following formula (A).

860WH1=V (t-x) (V V2) (tl
x)...(A) However, W is the heater capacity, ■ is the capacity of the hot water storage tank l, and B is the residual hot water temperature.5 The residual temperature is the heat radiation temperature determined from the boiling temperature (1) in the experiment. (For example, elapsed time X 0.
5'C) is used.

Note 2: In equation (A), the first term V (−X) on the right-hand side
corresponds to the amount of heat required by the user on the previous day, and this value may be set in advance by the user, for example.

Block 15 calculates the required energization time (H2 ).

V (t-x) - (V-V3) (t 1-x)H2
-□ 60W...(B) However, for V3, the value of the flowmeter 11 on that day is used.

Block 16 is a block that specifies the start time of energization of the heater 3, and the length of the late-night power energization time during which late-night power is supplied (
T) minus the required energization time (H2) of the heater 3 to boil the amount of hot water to be consumed the next day calculated in block 15 and the margin time (α), that is, T-(+(2
+α) When the time has elapsed, the block 17 is instructed to start energizing the heater 3.

The block 17 instructs the heater 3 to start energizing at the time instructed by the block 16, and also captures the water temperature at the end of the required energization time via the thermistor 2 and inputs it to the block 13. This is a control block.

Block 18 accurately measures the time from the start to the end of energization of heater 3 and inputs the energization time to block 13 .

In the control device having the above configuration, first, the boiling status of the previous day, that is, the value of the flow meter 11 of the previous day.

Required energization time, /! ll! Calculate the previous day's water supply temperature from the raised temperature. Then, from the water supply temperature and the value of the flowmeter 11 corresponding to the amount of hot water consumed that day, the required energization time of the heater 3 to boil the amount of hot water to be consumed the next day is calculated, and the amount of time remaining is calculated from the end of the midnight power supply. so that the required energization time ends approximately at the expected time.

Controls the start time of energization to the heater 3. Therefore, in this example, it is possible to shift the power peak that was concentrated at the start of late-night power supply.

(Effects of the Invention) In the present invention, the water supply temperature is calculated using the amount of hot water consumed, the energization time of the heating element, and the amount of heat required by the user.

Furthermore, since the heating element is controlled by calculating the required energization time using the water supply temperature and the amount of extinguished hot water, there is no need for a plurality of sensors on the inner surface of the hot water storage tank. Therefore, it is possible to minimize the occurrence of rust caused by processing the inner surface of the hot water storage tank.

Lifespan can be improved. Also, turn off! Since the two heating elements are controlled with the required energization time commensurate with the amount of hot water and the temperature of the water supply, late-night power consumption can be saved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a control device for a hot water storage type electric water heater according to the present invention, and FIG. 2 is a schematic diagram illustrating the operation of the embodiment. 2...Thermistor 3...Heater 4...Microcomputer 7...Relay 13~
18... Treatment block applicant Motoshi Fujinuma, representative of Sekisui Chemical Co., Ltd.

Claims (1)

[Scope of Claims] l) Consumption amount detection means for detecting the amount of hot water consumed in the hot water storage tank. A heating element installed inside the hot water storage tank. A control means for controlling energization to the heating element. a first calculation means for calculating the water supply temperature using the amount of hot water detected by the amount of hot water consumption detected by the amount of hot water consumed, the energization time to the heating element, and the amount of heat required by the user; The hot water storage type electricity is characterized by comprising a second calculating means for calculating the required energization time using the hot water amount detected by the hot water consumption amount detecting means and the water supply temperature calculated by the first calculating means. Water heater control device.