JPH049975B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to heater energization control of a hot water storage type electric water heater using late-night electricity.

Configuration of conventional example and its problems As shown in FIG. 1, this type of conventional electric water heater uses a water supply temperature detection means 15 provided in a water supply pipe 5 connected to a hot water storage tank 1 and a preset amount of hot water to be used. A heat amount calculation means 17 that calculates the amount of heat to be added from the set value set by the hot water amount setting means 16; and an energization calculation means 16 that calculates the required energization time to the late-night power heater 2 based on a signal from the heat amount calculation means 17. ,
A timer means 19 controls the time of late-night power supply based on a signal from the energization calculation means 18, a temperature detection means 3 detects the hot water tank temperature, and a difference between the signal from the temperature detection means 3 and the preset temperature Energization control means 1 for controlling energization to power heater 2
It was composed of 2.

In this configuration, the set value set by the hot water amount setting means 16 is rarely changed every day, and is set at the maximum so as not to run out of hot water, so that it roughly matches between each user, and Since the signals from the water supply temperature detection means 15 provided in the water supply pipe 5 roughly match depending on the season, the heat amount calculation means 17 calculates the amount of heat to be added, and the late-night power heater 2 Energization calculation means 16 and energization calculation means 18 that calculate the required energization time to
The times set by the timer means 19 that control the time of late-night power supply based on signals from There was a need to increase the size of the equipment to cope with concentrated power loads.

Purpose of the invention The present invention solves such conventional problems,
The purpose is to determine the time to start energizing late-night power heaters based on the required boiling temperature calculated from the stored energization time, prevent concentration of power loads, and improve the daily load factor of power generation and substations. do.

Structure of the Invention In order to achieve this object, the present invention includes a heater installed in a hot water storage tank, a temperature detection means for detecting the temperature of the hot water storage tank, and a signal from the temperature detection means set to a preset reference value. an energization detection means for detecting the energization time to the heater from the time when the energization is reached; a storage means for storing the signal from the energization detection means for a certain period; and a required boiling temperature calculated based on the signal from the storage means. a hot water temperature calculation means; an energization calculation means for calculating the start time of energization to the heater based on a signal from the hot water temperature calculation means; and energization control means for controlling energization of the energization.

With this configuration, the required boiling temperature is calculated by the water temperature calculation means from the signal of the energization detection means for a certain period stored in the storage means, and the energization calculation means is based on the required boiling temperature. This has the effect of determining the time to start energizing the heater for late-night power.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Late-night power heater 2 installed inside hot water tank 1
, a temperature detection means 3 provided above the late-night power heater 2 to detect the temperature of the hot water tank, and a temperature detection means 3
an energization detection means 8 for detecting the energization time to the late-night power heater 2 from the time when the signal from the energization detection means 8 reaches a preset reference value; and a storage means 9 for storing the signal from the energization detection means 8 for a certain period of time. , a hot water temperature calculation means 10 for calculating the required boiling temperature based on the signal from the storage means 9; and an energization calculation means 11 for calculating the time to start energizing the late-night power heater 2 based on the signal from the hot water temperature calculation means 10; It consists of a hot water temperature calculation means 10, an energization control means 12 that controls energization to the late-night power heater 2 according to signals from the energization calculation means 11 and the temperature detection means 3, a selection unit 13 that selects the maximum value from among the obtained energization times for a certain period;
A calculation unit 14 is provided which calculates the required boiling temperature based on the signal from the selection unit 13.

4 is a hot water supply pipe, 5 is a water supply pipe, 7 is a timer for late-night electricity, and 6 is a timer means provided in the energization control means 12 and activated by a signal from the energization calculation means 11.

In the above configuration, the hot water in the hot water storage tank 1 is controlled by the energization control means 12 at a time limited by the late-night power timer 7, using the signal from the temperature detection means 3 and the hot water temperature signal set by the hot water temperature calculation means 10. Based on the difference between the hot water and the hot water, the late-night power heater 2 is energized and heated, and hot water is discharged from the hot water supply pipe 4 and water is supplied to the hot water storage tank 1 from the water supply pipe 5 as needed. Here, the energization control means 12 includes an energization calculation means 11 that calculates the energization start time when energizing the late-night power heater 2.
Timer means 6 until the energization start time according to the signal from
is activated, and the late-night power heater 2 is controlled so as not to be energized. This energization start time is set as shown below. Temperature detection means 3
The energization time to the late-night power heater 2 is detected every day by the energization detection means 8 from the time when the signal from the heater 2 reaches a preset reference value, and is stored in the storage means 9 for a certain period (for example, one week), The selection section 13 selects the maximum value from among the fixed period of energization time obtained in the storage means 9, and the calculation section 14 calculates the required boiling temperature based on the maximum value using the following equation.

Ts=Tb+q×H/V However, Ts: Required boiling temperature Tb: Preset reference value q: Heater capacity H: Maximum energization time V: Required heating amount Energization calculation based on the required boiling temperature obtained above The means 11 calculates the time to start energizing the late-night power heater 2 as shown in FIG. Control so that it does not work.

As mentioned above, based on the maximum value selected from the energization time for a certain period, the heater for late-night electricity is
Since the energization start time is calculated and controlled, it becomes the energization start time in the actual usage state, which results in variations among each user, which has the effect of preventing concentration of power load and equalizing the power load.

In addition, since the energization start time is based on the maximum value selected from the energization time for a certain period of time, the water temperature will not reach the preset temperature within the time limited by the power timer 7. There isn't.

Effects of the Invention As described above, the electric water heater of the present invention provides the following effects.

(1) Since the power supply start time is calculated and controlled from the power supply time to the heater for late-night electricity for a certain period of time, the power supply start time is the time in actual use, which results in variation among each user, and the power load is This has the effect of preventing centralization and equalizing the power load.

(2) Since the energization start time is based on a value calculated from the energization time for a certain period of time, there is no need to worry about the water not reaching the preset temperature within the time limited by the power timer. do not have.

(3) Since the required boiling temperature is determined from the energization time for a certain period, there is no need for a hot water temperature setting means, the configuration is simple, and the inconvenience of setting the hot water temperature is eliminated.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a conventional electric water heater;
The figure is a schematic configuration diagram of an electric water heater according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation of the energization calculation means of the electric water heater. DESCRIPTION OF SYMBOLS 1...Hot water tank, 2...Heater, 3...Temperature detection means, 8...Electricity detection means, 9...Storage means, 1
0...Hot water temperature calculation means, 11...Electrification calculation means, 1
2... Energization control means, 13... Selection section, 14...
Arithmetic section.

Claims (1)

[Scope of Claims] 1. A heater installed in a hot water storage tank, a temperature detection means for detecting the temperature of the hot water storage tank, and a temperature detection means for detecting the temperature of the hot water storage tank, and a temperature detection means for detecting the temperature of the hot water storage tank from the time when the signal from the temperature detection means reaches a preset reference value. energization detection means for detecting the energization time to the heater; storage means for storing the signal from the energization detection means for a certain period; and water temperature calculation means for calculating the required boiling temperature based on the signal from the storage means; energization calculation means that calculates the start time of energization to the heater based on a signal from the hot water temperature calculation means; and energization that controls energization to the heater based on signals from the hot water temperature calculation means, the energization calculation means, and the temperature detection means. An electric water heater consisting of a control means. 2. The hot water temperature calculation means includes a selection section that selects the maximum value from a certain period of energization time obtained based on the signal from the storage section, and a calculation section that calculates the required boiling temperature based on the signal from the selection section. An electric water heater according to claim 1, comprising: