JPH04165263A - Electric water heater - Google Patents

Abstract

PURPOSE:To make the operation efficient in the use of electric power and in the timing of heating by a method wherein, in turning off the daytime supply of power, the actuation of the heater is controlled in relation to the time zone in which the power is turned off, the heated state of the water, and the use of a peak shift from the viewpoint of suiting the heating to the purposes. CONSTITUTION:When, during the daytime zone of power supply (D), an apparatus is set to turn off the power, that is, the setting is given during heating or after completion of heating to the boil, the heating is not resumed in either case during the rest of the daytime zone (D) but a peak shift is started at the point of transition to the midnight zone of power supply (N). When the setting to turn off the power is given during the midnight zone of power supply (N), the setting is given during heating, during a peak shift, or during heating following a peak shift.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric water heater, and more particularly to boiling operation control of an electric water heater that uses daytime power and late-night power.

(Prior art) This type of electric water heater mainly uses electricity during late night hours (usually 23:00 to 7:00 a.m.) when electricity prices are low to heat the water, thereby saving energy costs. It is used as such.

Additionally, the demand for late-night electricity generally tends to be at its maximum around 23:00, when the late-night power period begins, and at its minimum around 7:00, when this period ends. Therefore, late-night electricity charges are set so that they become cheaper in proportion to this decreasing trend in demand.In order to further increase the cost-saving effect on the user side, when using electricity during late-night hours, calculations are generally made to At the end of the time period (7:00
The so-called "peak shift" calculates the boiling time in advance and controls the energization start time so that drying is completed at exactly the same time.
is being carried out.

[Problem to be solved by the invention]

As mentioned above, in conventional electric water heaters of this type where you can choose to use or not use daytime electricity, which has a relatively high electricity rate, when switching from using daytime electricity to not using electricity, it is possible to switch between daytime electricity use and late night electricity consumption. Regardless of the zone, if the boiling operation is in progress at the time of switching, the system was designed to stop the boiling operation after reaching the set groove raising temperature.

However, in the conventional control method as described above, the user's intention to switch from using daytime power to not using it in order to use power efficiently and avoid the use of daytime power, which has a relatively high power rate, is difficult to overcome. It will not be suitable for you.

The present invention has been made in view of the problems of the prior art as described above, and it reduces boiling and power consumption by controlling the boiling operation to suit the purpose depending on the time of day when the switching is performed. The purpose is to provide a means to streamline the process.

(Means for Solving the Problems) Therefore, in the present invention, in an electric water heater that uses daytime power and late-night power and allows you to select whether or not to use the daytime power, which has a relatively high power rate, When switching from using daytime power to not using it, it will immediately stop even if it is in boiling mode during daytime power hours, and from then on, during this daytime power time period, it will not perform -cutting and lowering operations. on the other hand,
During the late night power hours, the control means is configured to immediately stop the boiling operation and start the peak shift, and to continue the boiling operation if the boiling operation is stopped or during the peak shift. This aims to achieve the above objective.

[Effect]

With the configuration of the electric water heater of the present invention as described above, when switching from use to non-use of electricity during the day, the boiling operation can be adjusted to the desired purpose depending on the time of day, the boiling operation state, and the peak shift state at the time when the switching is set. Since the system is configured to control the system in a controlled manner, the boiling operation and power usage can be made more efficient.

(Example〕 The present invention will be explained below based on examples.

FIG. 1 shows five examples of boiling operation control time charts during the daytime when power is not used in an embodiment of this type of electric water heater according to the present invention.

On the horizontal axis, we take the daytime power time period D from 7:00 to 23:00 and the late night power time period N from 23:00 to 7:00,
Each time chart of the boiling operation control time chart of the electric water heater including the start of peak shift calculation is shown.

(a) and (b) each show the case where the above-mentioned non-use (OFF) switching setting is performed during daytime power hours, and (a)
) is during the boiling operation, and (b) is the case where the switch is set after the boiling is completed. In both cases, no boiling operation is performed during the subsequent daytime power hours, and at the time of transition to the late night power time zone N ( Peak shift will begin at 23:00.

(c), (d), and (e) show the case where the above-mentioned non-use (OFF) switching setting is performed in the late night power time zone N; (C)
(d) shows a time chart during a boiling operation, (d) shows a time chart during a peak shift, and (e) shows a time chart when a switching setting is performed during a boiling action after a peak shift.

(Effects of the Invention) As explained above, according to the present invention, when switching daytime power from use to non-use, the boiling operation is combined depending on the time of day, the boiling operation state, and the peak shift state at the time when the switching is set. Since the system is configured to be controlled in a targeted manner, the boiling operation and power usage are more efficient.

[Brief explanation of drawings]

FIG. 1 shows a boiling operation control time chart during daytime power switching for an embodiment of the electric water heater according to the present invention.
This is an example of an aspect. D-・・・Daytime power period N-・・・Late-night power period

Claims (1)

[Claims] In an electric water heater that uses daytime power and late-night power, and allows you to select whether to use or not use the daytime power, which has a relatively high power rate, when switching from using the daytime power to not using the daytime power, during the daytime power hours, Even if the boiling operation is in progress, it will stop immediately and no further boiling operation will be performed during the daytime power hours.On the other hand, if it is in the middle of the night power hours, if it is in the boiling operation, it will stop immediately and shift the peak. start,
Further, an electric water heater characterized in that the control means is configured so that the boiling operation continues as it is when the boiling operation is stopped or during a peak shift.