JPS63135746A - Heat accumulation control method for heat accumulation type electric heater - Google Patents

Abstract

PURPOSE:To perform heating responding to an outside air temperature, by a method wherein through measurement of an actual outside air temperature right before a point of time when a midnight power time is completed, a heat accumulating amount of an electric heater responding to an estimated outside air temperature is corrected. CONSTITUTION:In a starting point t1 of a midnight power time, a point of time being retroactive by a specified time from a completion point of time t2 of a midnight power time is set as a reference point of time t0. A point of time t3 being retroactive by a set energizing time T1 is set as a point of time at when energization is started, whereby power is supplied from a power source during the energizing time T1, and power supply is completed at the reference point of time t0. The energization causes heating of a heat accumulating body to accumulate heat equivalent to the energization time T1. At the reference point of time t0. an actual outside air temperature is measured, a heat accumulating amount responding to the outside air temperature is compared with a heat accumulating amount responding to an estimated outside air temperature to determine a difference therebetween. An energizing time T2 in which a heat accumulating amount responding to the difference can be provided is set, and a heater is energized in order to perform accumulation of heat according to the energizing time T2.

Description

[Detailed Description of the Invention] [Object of the Invention] (Prior Art) A heat storage type electric heater used in homes etc. has an electric heater, a heat storage body (solid heat storage body), and a fan installed inside a case. During the midnight electricity hours, the electric heater is energized to heat the heat storage element, and heat is stored in the heat storage element.At times other than the midnight electricity hours, the heat is released from the heat storage element and warms the air. A fan sends the air outside to heat the room. In this regenerative electric heater, in order to perform heating at an indoor temperature corresponding to the outside air temperature, it is important to store heat in the heat storage body with an amount of heat storage that corresponds to the outside air temperature as much as possible.

Therefore, in order to store heat in a conventional heat storage type electric heater using late-night electricity, a method shown in FIG. 2 has been adopted. Usually, the target time for late-night electricity is 0:00 AM.
8:00 a.m. to 8:00 a.m. One method is to start energizing the electric heater of the heater from the start of the late-night power period (midnight), as shown in Figure 2 (a), and calculate the expected load conditions for the next day, i.e. the outside temperature. This is a method of storing heat by continuously applying electricity for a period of time that allows the amount of heat storage corresponding to the amount of heat to be obtained. However, with this method, electricity is turned on from the start of the late-night power period to store heat, and the heat storage ends before the end of the late-night power period, so there is a long period of time between the end of heat storage and the time the heater is actually used. I have time,
There is a problem in that the amount of wasted heat released from the heat storage body during this time is large. Another problem with this method is that the late-night power demand of each household is concentrated in the first half of the late-night power period, placing a burden on power transmission and distribution equipment.

Therefore, recently, a method shown in FIG. 2(b) has been adopted. This method stores heat by energizing the electric heater for a certain period of time from the start of the late-night power period, and then predicts the load condition, that is, the outside temperature, at the end of the late-night power period (8:00 a.m.). The energization time is set so that the amount of heat storage corresponding to the predicted outside temperature can be obtained in addition to the heat storage due to energization, and the energization time is set between the end of the late-night power period and the end of the power period. This is a method of storing heat.

(Problem to be Solved by the Invention) However, in the method shown in FIG. 2(b), power is applied separately in the first half and the second half of the late night power period, so it is not possible to disperse the power demand. Furthermore, loss of heat storage due to wasteful heat radiation can be reduced.

However, on the other hand, this method has the following problems. In this method, the outside temperature at the end of the midnight power period (1118 p.m.) is predicted the day before, and the power supply time, that is, the heat storage amount, for the latter half is set. However, at the actual end of the process, the outside temperature may change due to climate change, and in this case, there is a large difference between the predicted temperature the previous day and the actual outside temperature. As a result, the difference between the amount of heat storage corresponding to the predicted temperature and the amount of heat storage corresponding to the actual concentration is large, and the heat storage amount is as close as possible to the amount of heat storage corresponding to the actual outside temperature at the end of the midnight power period. You will not be able to do this. Therefore, it is difficult to perform heating that corresponds to the outside temperature.

The present invention has been made based on the above-mentioned circumstances, and is a regenerative electric heater that can store heat in a heat storage body with an amount of heat storage that is very close to the amount of heat storage that corresponds to the outside air temperature at the end of the late-night electric power period. The purpose of this invention is to provide a heat storage control method.

[Structure of the invention]

(Means and operations for solving the problems) In order to achieve the above object, the heat storage control method of the heat storage type electric heater of the present invention uses late-night electricity to energize the electric heater to heat the heat storage body. In an electric heater that stores heat and releases the accumulated heat from the heat storage body to perform heating, the time between this reference time and the end time is set as the reference time a certain amount of time after the end of the late-night power period. In addition to predicting the load conditions for the electric heater, set the energization time to obtain the amount of heat storage corresponding to this load condition, energize the electric heater at the energization time set as the end of energization at the reference time, and then at the reference time. Measure the actual load conditions, compare the actual load conditions and the predicted load conditions, and if the actual load conditions are greater than the predicted load conditions, set the energization time to obtain the amount of heat storage corresponding to the difference, and set the energization time to obtain the amount of heat storage corresponding to the difference, and The feature is that the electric heater is energized for a set energization time between the end of the midnight power period and the end of the midnight power period. In other words, the actual outside air temperature is measured at a reference point close to the end of the late-night power period, and based on this measured temperature, the amount of heat storage is corrected between the reference point and the end point according to the predicted temperature. be.

(Example) An embodiment of the present invention will be described below with reference to FIG.

In this embodiment, the late-night power time is set to be 8 hours from 0:00 a.m. to 8:00 a.m. That is, the start time t1 of the midnight power period is set to midnight, and the end time t2 is set to 8am.

First, at the start time t1 of the late night power time, a reference time 10 is set as a point a certain amount of time back from the end time t2 (8:00 a.m.) of the late night power time. For example, 7Fj# in the morning, one hour back from 8R in the morning, is set as the reference time tQ.

Then, the load condition for the electric heater, that is, the outside air temperature, for one hour between this reference time 10 and the end time t2 of the late-night power period is predicted, and the energization time is such that the amount of heat storage corresponding to this predicted outside air temperature can be obtained. Set T1.

Next, the electric heater of the electric heater is energized from the power source for the energization time T1, and the energization is ended at the reference time to, with a time point t3, which is a set energization time T1 back from the reference time point 10, as the energization start point.

By energizing the electric heater, the heat storage body is heated and heat corresponding to the energization time T1 is accumulated. As a result, heat is stored in the heat storage body of the electric heater with a heat storage amount corresponding to the predicted outside temperature.

Next, at the reference time to, the actual outside temperature is measured, and the amount of heat storage corresponding to the measured actual outside temperature and the amount of heat storage corresponding to the predicted outside temperature (the amount of heat stored in the heat storage body due to the energization during the previous energization time T1) are calculated. amount) and find the difference between the two. As a result of this comparison, if the amount of heat storage corresponding to the actual outside air concentration is excessive compared to the amount of heat storage at the predicted outside air temperature, an energization time T2 is set that can obtain the amount of heat storage corresponding to the difference.

Next, between the reference time point 10 and the midnight power time t2, the electric heater of the electric heater is energized for the set energization time T2. This energization causes the heat storage body of the electric heater to store heat in an amount corresponding to the energization time T2. This work is a correction work that matches the amount of heat storage corresponding to the predicted outside temperature to the amount of heat storage corresponding to the actual outside temperature.

As a result, the heat storage body stores an amount of heat equal to the sum of the amount of heat stored during the previous energization time T1 and the amount of heat stored during the subsequent energization time T2. In other words, the amount of heat stored in the heat storage body is the amount of heat stored corresponding to the actual outside temperature at the reference time point 10.

Therefore, the reference time to is the end FR period of late night power time t
2, and there is very little possibility that the outside air temperature at the reference time 10 will change suddenly until the end time t2.

Therefore, the outside air temperature at the reference time point 10 is close to the outside air temperature at the end point, and the amount of heat storage corresponding to the outside temperature at the end point Lt'' corresponds to the outside air temperature at the end point t2. Therefore, the heat storage body can store a heat storage amount that is close to the heat storage amount corresponding to the actual outside temperature at the end of the midnight time t2.

Note that prediction of outside air temperature, measurement of outside air temperature, setting of energization time to the electric heater, starting and ending of energization to the electric heater, etc. are automatically performed by circuits and equipment provided in the electric heater.

〔Effect of the invention〕

As explained above, according to the heat storage control method for a heat storage type electric heater of the present invention, the actual outside air temperature is measured just before the end of the late night power time, and the heat storage of the electric heater corresponding to the predicted outside air temperature is performed. By correcting the amount, it is possible to store heat in the electric heater in an amount that approximates the amount of heat stored in the heat storage layer corresponding to the actual outside temperature at the end of the midnight power period. Therefore, it is possible to store heat in the electric heater so that it can perform heating in response to the outside air temperature.

[Brief explanation of the drawing]

FIG. 1 is a time chart showing the heat storage control method of the present invention;
FIGS. 2(a) and 2(b) are time charts showing a conventional heat storage control method. to...Reference time, tl...Start time of late night power time, t2...End time, T1. T2...Electrification time.

Claims (1)

[Claims] In electric heaters that use late-night power to supply electricity to an electric heater to heat a heat storage body to store heat, and then release the accumulated heat from this heat storage body to provide space for heating, a certain period of time is set back from the end of the late-night power period. The load condition for the electric heater between this reference point and the end point is predicted using the point in time as a reference point, and the energization time to obtain the amount of heat storage corresponding to this load condition is set, and the point in time is set as the reference point. The electric heater is energized with the energization time set as the energization end point, and the actual load condition is measured at the reference time and the actual load condition and the predicted load condition are compared to determine whether the actual load condition is the predicted one. If the load is greater than the load condition, an energization time is set to obtain a heat storage amount corresponding to the difference, and the electric heater is energized for the set energization time between the reference time and the end of the late night power time. A heat storage control method for a heat storage type electric heater, characterized in that: