JPH07151390A - Electric hot-air heater - Google Patents

Abstract

PURPOSE:To provide an electric hot-air heater in which heat is stored in a heat storage material to heat hot air by heat stored in the material, and heat can be stored in the material without waste of electric power by shortening a heat storage time from a heat storage temperature and a detected temperature of a heat storage material temperature sensor obtained by calculating a heat storage temperature as means. CONSTITUTION:A heat storage temperature of a heat storage material 4 is obtained based on a detected temperature of a heat storage material temperature sensor 24 and a set temperature. Then, a heat storage time required for storing the material 4 at the temperature is obtained by a fuzzy inference based on the obtained heat storage temperature and a detected temperature of the sensor 24. Thus, when heat storage is started for the material before the storage time, heat of the material 4 can be stored at the storage temperature at a desired time without wasting power by shortening the storage time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric air blower for blowing heat stored in a heat storage material as hot air.

[0002]

2. Description of the Related Art In such an electric warmer, a heat storage heater is covered with a heat storage material, and heat generated from the heat storage heater is stored in the heat storage material. Then, by blowing air to this heat storage material, the heat stored in the heat storage material is output as warm air.

In such an electric warmer, heat must be stored in the heat storage material during use. For example, as shown in the operation pattern of FIG. 18, the heat storage heater is energized to start heat storage from 10:00 am, and the heat storage is completed at 1:00 pm after storing heat for a certain time, for example, 3 hours. Thereafter, the heat storage heater is intermittently energized to maintain the heat storage temperature of the heat storage material. Then, warm air is obtained by blowing air to the heat storage material.

[0004]

However, in such a heat storage method, after the heat storage of the heat storage material is completed, the heat storage heater is intermittently energized so that the heat stored in the heat storage material is maintained. Since it has to be kept warm, the time required for heat storage becomes long and power is wasted. Therefore, an object of the present invention is to provide an electric warmer capable of storing heat in a heat storage material without wasting electric power and shortening the heat storage time.

[0005]

According to a first aspect of the present invention, a temperature sensor for detecting an ambient temperature in an electric warmer that stores heat in a heat storage material and then sends the heat stored in the heat storage material as hot air. And a heat storage material temperature sensor for detecting the temperature of the heat storage material, a heat storage temperature calculation means for obtaining a heat storage temperature for the heat storage material based on at least the temperature detected by the temperature sensor and the set temperature, and at least the heat storage temperature calculation means. An electric air blower, which is provided with a heat storage time calculating means for obtaining a heat storage time required to store the heat storage material at the heat storage temperature based on the heat storage temperature and the temperature detected by the heat storage material temperature sensor.

According to a second aspect of the present invention, in an electric warmer that stores heat in a heat storage material and then sends the heat stored in the heat storage material as hot air, a temperature sensor for detecting an ambient temperature,
A heat storage material temperature sensor that detects the temperature of the heat storage material, and a membership function of at least the temperature difference between the ambient temperature and the set temperature, and perform fuzzy inference based on at least the temperature detected by the temperature sensor and the set temperature to store heat. A first fuzzy calculation means for obtaining a heat storage temperature for a material, and a membership function of a temperature difference between at least the heat storage material temperature and the heat storage temperature obtained by the first fuzzy calculation means, and at least a heat storage temperature and a heat storage material temperature sensor. And a second fuzzy calculation means for obtaining a heat storage time required to store the heat storage material at the heat storage temperature by executing fuzzy inference based on the detected temperature of the electric hot air blower.

[0007]

According to the first aspect of the present invention, before the heat stored in the heat storage material is sent as warm air, the heat storage temperature for the heat storage material is obtained based on at least the ambient detected temperature and its set temperature, and then at least this The heat storage time required to store the heat storage material in the heat storage temperature is obtained based on the heat storage temperature and the detected temperature of the heat storage material.

Therefore, if heat storage for the heat storage material is started before this heat storage time, the heat storage material is brought to the heat storage temperature at a desired time.
It is possible to store heat without wasting electric power and shortening the heat storage time. According to claim 2, prior to blowing the heat stored in the heat storage material as warm air, fuzzy inference is executed based on at least the ambient detected temperature and its set temperature to obtain the heat storage temperature for the heat storage material. In addition, fuzzy inference is performed based on at least the heat storage temperature and the detected temperature of the heat storage material to obtain the heat storage time required to store the heat storage material at the heat storage temperature.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a heat storage type electric warmer. A heat storage tank 2 is arranged inside the housing 1. The heat storage tank 2 has a structure in which a heat storage heater 3 is arranged at the center thereof, and a heat storage material 4 is covered around the heat storage heater 3. The heat storage material 4 is made of a material having good electrical insulation and excellent heat conductivity, such as MgO or F.
It is made of bricks obtained by firing oxides such as e ₂ O ₃ , Al ₂ O ₃ and SiO ₂ .

Around the heat storage tank 2, a heat insulating material 5 is provided.
Have been placed and are being thermally cut off. The heat insulating material 5 has an opening formed below, and an air layer heat insulating portion 6 is formed between the heat insulating material 5 and the heat storage tank 2.

A ceramic heater (PTC heater) 7 is provided below the opening of the heat insulating material 5. A blower port 8 and an intake port 9 are formed on the front surface and the rear surface of the lower part of the housing 1 where the PTC heater 7 is arranged, of which a warm air louver 10 is formed on the blower port 8 for intake. A shutter 11a is provided on the mouth 9 side.

The shutter 11a is rotated in the direction of the arrow to adjust the amount of air flow, and the amount of air flowing to the heat storage tank 2 side is adjusted by the rotation angle. It should be noted that this shutter 11a is used for the servo motor 1
It is rotated in response to the drive of 1b.

A blower motor 12 is provided on the rear surface of the housing 1, and a blower fan 13 is attached to the rotary shaft of the blower motor 12. The blower motor 12 rotates the blower fan 13 and sends the sucked air to the intake port 9.

On the upper part of the housing 1, power on / off, temperature setting, room size, warm air start time, heat storage heater 3 or P.
Each operation board 14 for selecting the TC heater 7 is provided, and its manual operation end 15 is provided on the upper surface of the housing 1.

On the other hand, the structure of the control system will be described with reference to FIG. The operation board 14 is connected to the main control unit 20, and the room temperature sensor 23 and the heat storage material temperature sensor 24 are connected via the information analysis unit 21 and the input unit 22.

The operation board 14 has a temperature setting section 14a and a room size setting section 14b, to which a manual operation end 15a for temperature setting and a manual operation end 15b for setting the room size are connected, respectively.

Of these, the temperature setting unit 14a has a function of reading the set temperature operated by the manual operation end 15a, and the room size setting unit 14b has a manual operation end 1.
It has a function of reading and storing the room size operated by 5b, for example, 4 tatami mats and 6.5 tatami mats.

On the other hand, the room temperature sensor 23 is provided on the rear surface of the housing 1, and detects the ambient atmospheric temperature, that is, room temperature and outputs a temperature signal according to the room temperature. The heat storage material temperature sensor 24 is provided in the heat storage tank 2 to detect the temperature of the heat storage material 4, and outputs a temperature signal according to the heat storage material temperature. The temperature signals from the room temperature sensor 23 and the heat storage material temperature sensor 24 are sent to the information analysis section 21 through the input section 22.

The information analysis unit 21 has a function of receiving a temperature signal from the room temperature sensor 23, obtaining a temperature rise rate of room temperature, and obtaining a temperature difference between the room temperature and the set temperature of the temperature setting unit 14. There is.

A fuzzy calculation means 25 is connected to the main controller 20. This fuzzy calculation means 25
Fuzzy inference unit 26 and membership function memory unit 2
It is composed of 7.

Of these, the membership function memory unit 27
3 has a control rule table shown in FIG. 3 and a heat storage time rule table shown in FIG. 4 formed therein, a membership function of the temperature difference between the room temperature and the set temperature shown in FIG. 5, and a room size shown in FIG. Membership function of FIG. 7, room temperature membership function shown in FIG. 7, heat storage temperature fuzzy set shown in FIG. 8, room temperature membership function shown in FIG.
The membership function of the temperature difference between the heat storage material temperature and the target temperature shown in 0 and each information of the fuzzy set of the heat storage time shown in FIG. 11 are stored.

Of these, the membership function of the temperature difference between the room temperature and the set temperature shown in FIG. 5 is composed of three fuzzy variables of large (H), medium (M) and small (L).

Further, the membership function of the room size shown in FIG. 6 is as follows: the room size is large (B), medium (M),
Narrow (S) Consists of three fuzzy variables. The room temperature membership function shown in FIG. 7 consists of two fuzzy variables, which are high (H) and low (L) at room temperature.

The fuzzy set of heat storage temperature shown in FIG. 8 is such that the heat storage temperature is high (H), slightly high (MH), and slightly low (M).
L), a low (L) fuzzy variable. The room temperature membership function shown in FIG. 9 consists of three fuzzy variables: room temperature high (H), medium room temperature (M), and room temperature low (L).

The membership function of the temperature difference between the heat storage material temperature and the target temperature shown in FIG. 10 is made up of three fuzzy variables of large (H), medium (M) and small (L).

The fuzzy set of heat storage time shown in FIG.
Long heat storage time (L), medium (M), short (S) 3
It consists of two fuzzy variables. Next, the fuzzy inference unit 26 has the following functions.

That is, the membership function memory unit 2
The fuzzy inference based on the room temperature stored in the information analysis unit 21 and the set temperature set in the temperature setting unit 14a is read out from the fuzzy set of the control rule, each membership function, and the heat storage temperature stored in 7. Is executed to read the fuzzy set of the heat storage time rule, each membership function, and the heat storage time stored in the membership function memory unit 27. The second fuzzy calculation function for obtaining the heat storage time required to store the heat storage material 4 at the heat storage target temperature by executing fuzzy inference based on the heat storage temperature obtained by the fuzzy calculation function of Have

The main control section 20 executes a series of operation control for the operation board 14, the information analysis section 21 and the fuzzy operation means 25, and the operation start time and the second fuzzy operation function set in the operation board 14 are used. It has a function of temporally controlling the heat storage start time, the operation start time, and the like for operating the power control unit 28 based on the calculated heat storage time.

Next, the operation of the warm air blower configured as described above will be described. Manual operation end 15a for temperature setting
When a desired set temperature (for example, 27.5 ° C.) is set for the room and a room size (for example, 6.5 tatami) is set for the manual operation end 15b for setting, the temperature setting unit 14a
Reads the set temperature, and the room size setting unit 14b reads the room size.

On the other hand, the room temperature sensor 23 has a room temperature (for example, 1
0 ° C) is detected and a temperature signal corresponding to the room temperature is output,
The heat storage material temperature sensor 24 detects the temperature of the heat storage material 4 (for example, 20
(° C) is detected and a temperature signal corresponding to the temperature of the heat storage material is output. These temperature signals are sent to the information analysis section 21 through the input section 22, respectively.

The information analysis unit 21 receives the temperature signal from the room temperature sensor 23 to obtain the temperature rise rate of the room temperature, and the temperature difference between the room temperature and the set temperature of the temperature setting unit 14 (17.5).
℃) etc.

Next, the fuzzy inference unit 26 reads out the fuzzy set of the control rules, each membership function, and the heat storage temperature stored in the membership function memory unit 27, and reads out the room temperature or the room temperature stored in the information analysis unit 21. Fuzzy inference is executed based on the set temperature or the like set in the temperature setting unit 14a to determine the heat storage temperature for the heat storage material 4.

More specifically, if the temperature difference between the room temperature and the set temperature is 17.5 ° C., the room size is 6.5 tatami, and the room temperature is 10 ° C., the fuzzy inference unit 26 determines the room temperature shown in FIG. By the membership function of the temperature difference from the temperature setting temperature, M = 0.5 H = 0.5 is obtained, and by the membership function of the room size shown in FIG. 6, M = 0.75 B = 0.25 is obtained. , L = 0.7 H = 0.3 is obtained by the room temperature membership function shown in FIG.

Next, the fuzzy inference unit 26 uses the above grades to execute the operation according to the rule and the Max-Min method shown in FIG. 3, and H = 0.5 B = 0.25 H = 0.3 → H = 0.25 H = 0.5 B = 0.25 L = 0.7 → H = 0.25 H = 0.5 M = 0.75 H = 0.3 → H = 0.3 H = 0. 5 M = 0.75 L = 0.7 → MH = 0.5 M = 0.5 B = 0.25 H = 0.3 → H = 0.25 M = 0.5 B = 0.25 L = 0.7 → MH = 0.25 M = 0.5 M = 0.75 H = 0.3 → MH = 0.3 M = 0.5 M = 0.75 L = 0.7 → MH = 0. 5 is obtained, and H = 0.3 MH = 0.5 is obtained from these.

Next, the fuzzy inference unit 26 makes these H =
By applying 0.3 and MH = 0.5 to the fuzzy set of the heat storage temperature shown in FIG. 8, the target heat storage temperature 2 by the area centroid method.
Determine 20 ° C.

Next, the fuzzy inference unit 26, the heat storage time rule stored in the membership function memory unit 27,
The fuzzy set of each membership function and the heat storage time is read out, and fuzzy inference is executed based on the target heat storage temperature 220 ° C. and the temperature detected by the heat storage material temperature sensor 24 to store the heat storage material 4 at the target heat storage temperature. Calculate the required heat storage time.

More specifically, if the room temperature is 10 ° C., the temperature detected by the heat storage material temperature sensor 24 is 20 ° C., and the temperature difference between the heat storage material temperature and the target heat storage temperature is 200 ° C., the fuzzy inference unit 2
6 is M = 1 from the room temperature membership function shown in FIG.
Then, H = 0.3 M = 0.7 is obtained from the membership function of the temperature difference between the heat storage material temperature and the target heat storage temperature shown in FIG.

Next, the fuzzy inference unit 26 uses each of these grades, and the heat storage time rule and Max-M shown in FIG.
The calculation is performed by the in method to obtain M = 1 H = 0.3 → L = 0.3 M = 1 H = 0.7 → M = 0.7, and L = 0.3 and M = 0. 7 is applied to the fuzzy set of heat storage time shown in FIG. 11, and the heat storage time of 100 minutes is obtained by the area centroid method.

Next, the main controller 20 controls the heat storage start time and the operation start time for operating the power controller 28 based on the operation start time and the heat storage time 100 minutes set on the operation board 14.

For example, if the operation start time is 5:00 pm and the heat storage time is 100 minutes, the main control section 20 determines that
From 3:20 pm, which is 00 minutes before, the power control unit 28 is operated to energize the heat storage heater 3 to perform heat storage operation. As a result, at 5 pm, the heat storage amount of the heat storage material 4 becomes sufficient to reach the target storage temperature.

After that, at 5 pm, the main control unit 20
Controls the rotation of the blower fan 13. This blower fan 1
The air sucked by the rotation of 3 is sent to each of the heat storage heater 3 side and the ceramic heater 7 side, and the air sent to the heat storage heater 3 side flows from the heat storage tank 2 by flowing through the air layer heat insulating section 6. The temperature rises in response to the heat radiation of, and is blown as warm air from the blower opening 8. At the same time, the air sent to the PTC heater 7 side receives heat from the PTC heater 7 and its temperature rises, and is combined with the warm air from the heat storage tank 2 and sent.

As described above, according to the above-described embodiment, the heat storage is started before the time when the hot air operation is started by the heat storage time required to store the heat storage material 4 at the target heat storage temperature. , You can save money by eliminating waste of power consumption,
Moreover, the heat storage time can be shortened to store heat in the heat storage material 4. Since the amount of heat storage is performed according to the size of the room, it is possible to prevent the temperature of the room from increasing.

The above embodiment may be modified as follows. The heat storage temperature may be set to a constant temperature, and the heat storage time may be determined by fuzzy inference based on the temperature difference between the heat storage temperature and room temperature.

Further, although the above-mentioned one embodiment has explained the example in which the fuzzy inference is applied, the invention is not limited to the application of the fuzzy inference. In this case, the room temperature, the temperature difference between the room temperature and the set temperature, the pattern of the heat storage temperature with respect to the size of the room, the pattern of the heat storage time with respect to the temperature difference between the heat storage temperature and its target temperature are stored in advance, and the room temperature and the temperature of the heat storage material are stored. The pattern of the heat storage time and the like is read out according to each measured value and the size of the room.

Next, an embodiment in which the temperature control of the electric machine warm air machine is improved will be described. The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals. FIG. 12 is an enlarged view of the intake port 9 at the bottom of the electric machine warm air blower. This intake 9
Is provided with a shutter 11a.
1a rotates in the direction of the arrow in response to the drive of the servomotor 11b, and adjusts the amount of air flow to the heat storage material 5 side.

On the other hand, FIG. 13 is a block diagram of the control system. A room temperature sensor 23 and a heat storage material temperature sensor 24 are connected to the main control unit 20 via the information analysis unit 21 and the input unit 22, and a temperature setting unit 14a, a membership function memory unit 27 and a fuzzy inference unit 26 are provided. It is connected.

A PTC blower motor control unit 30 is connected to the main control unit 20, the PTC heater 7 and the blower motor 12 are connected to this, and a servo motor control unit 31 is connected to which the servo motor 11a is connected. It is connected.

In the membership function memory unit 27, in addition to the above information, a control rule table for temperature control shown in FIG. 14 is formed, and a membership function of the temperature difference between the room temperature and the set temperature shown in FIG. Membership function of temperature rise rate shown in FIG. 16 and shutter 11 shown in FIG.
The fuzzy set of the opening / closing degree of a is stored.

Of these, the membership function of the temperature difference between the room temperature and the set temperature shown in FIG. 15 is made up of three fuzzy variables of high temperature (H), medium temperature (M), and low temperature (L).

Further, the membership function of the temperature increase rate shown in FIG. 16 is composed of three fuzzy variables, that is, the temperature increase rate is large (H), medium (M), and small (L). The fuzzy set of the opening / closing degree of the shutter 11a shown in FIG. 17 is made up of three fuzzy variables of a large opening / closing degree (O), a middle degree (Ha), and a small degree (C).

In addition to the above functions, the fuzzy inference unit 26 reads out the fuzzy set of temperature control control rules, each membership function, and the degree of opening and closing stored in the membership function memory unit 27, and the information analysis unit 21. The fuzzy inference is executed based on the room temperature and the set temperature set in the temperature setting unit 14a stored in the shutter 11
It has a function of obtaining the opening / closing degree of a.

Next, the temperature control action of the warm air blower configured as described above will be described. When heat storage in the heat storage material 5 is completed and normal operation of warm air blowing is performed, the main control unit 20 sends a control signal to fully open the PTC heater 7 and the blower motor 12 until the room temperature reaches the set temperature. It is sent to the unit 30.

In the state where the PTC heater 7 and the blower motor 12 are fully opened, the fuzzy reasoning unit 26 controls the opening / closing degree control rules stored in the membership function memory unit 27, each membership function, and opening / closing. The fuzzy set of degrees is read, and fuzzy inference is executed based on the temperature difference between the room temperature and the set temperature to determine the opening / closing degree of the shutter 11a.

More specifically, if the temperature difference between the room temperature and the set temperature is 20 ° C., the fuzzy inference unit 26 will be
16 is obtained by using the membership function of the temperature difference between the room temperature and the set temperature of H = 0.3 M = 0.7, and the temperature increase rate of 0.8 ° C./min obtained by the information analysis unit 21. M = 0.5 L = 0.5 is obtained from the membership function of the temperature rise rate shown in.

Next, the fuzzy inference unit 26 uses each of these grades, and the control rule and Max-Mi shown in FIG.
Calculation is executed by the n method, and M = 0.7 M = 0.5 → Ha = 0.5 M = 0.7 L = 0.5 → O = 0.5 H = 0.3 M = 0.5 → O = 0.3 H = 0.3 L = 0.5 → O = 0.3 was obtained, and from these, Ha = 0.5 and O = 0.5 were obtained.
The degree of opening and closing of the shutter 11a is calculated by applying the fuzzy set having the degree of opening and closing shown in FIG.

The main control unit 20 sends a control signal corresponding to the opening / closing degree of the shutter 11a of 75 ° obtained by the fuzzy inference unit 26 to the servo motor control unit 31 to control the opening / closing degree of the shutter 11a to 75 °. .

As a result, the amount of air flowing to the heat storage material 5 side is adjusted, and the temperature of warm air is controlled. As described above, according to the above-described embodiment, the PTC heater 7 and the blower motor 12 are fully opened until the room temperature reaches the set temperature.
Since the control rule of the opening / closing degree, each membership function, and the fuzzy set of the opening / closing degree are read and the fuzzy inference is executed based on the temperature difference between the room temperature and the set temperature, the opening / closing degree of the shutter 11a is determined. Can be controlled to reach the set temperature in the shortest time.

Therefore, when the heat radiation amount of the heat storage material 5 is large, for example, when the room is small, the heat radiation amount causes the room temperature to become higher than the set temperature, that is, the temperature overshoot occurs. Since the amount of air flowing through is adjusted, stable temperature control can be performed without temperature overshoot at the start of normal operation.

When the temperature of the heat storage material 5 reaches a certain temperature or higher, the main controller 20 turns off the power supply to the PTC heater 7 and adjusts the opening / closing of the shutter 11a to control the temperature of the warm air. As a result, all the heat stored in the heat storage material 5 is released.

When the temperature of the heat storage material 5 drops below a certain temperature, the main control section 20 closes the shutter 11a and controls the on / off of the PTC heater 7 and the blower motor 12.
The temperature of hot air is controlled by the drive control of.

The above embodiment may be modified as follows. For example, the PTC heater 7 and the blower motor 12 are not limited to the warm air adjustment depending on the opening / closing degree of the shutter 11a.
May be simultaneously controlled to maintain a stable temperature.

[0062]

As described above in detail, according to the present invention, it is possible to provide an electric warmer capable of storing heat in a heat storage material without wasting electric power and shortening the heat storage time.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an electric warmer according to the present invention.

FIG. 2 is a block diagram of an electric control system.

FIG. 3 is a schematic diagram of a control rule table.

FIG. 4 is a schematic diagram of a heat storage time rule table.

FIG. 5 is a diagram showing a membership function of a temperature difference between room temperature and a set temperature.

FIG. 6 is a diagram showing a membership function of room size.

FIG. 7 is a diagram showing a membership function at room temperature.

FIG. 8 is a diagram showing a fuzzy set of heat storage temperatures.

FIG. 9 is a diagram showing a membership function at room temperature.

FIG. 10 is a diagram showing a membership function of a temperature difference between a heat storage material temperature and a target temperature.

FIG. 11 is a diagram showing a fuzzy set of heat storage times.

FIG. 12 is an enlarged view of an air intake section.

FIG. 13 is a configuration diagram of a temperature control system.

FIG. 14 is a schematic diagram of a temperature control rule table.

FIG. 15 is a diagram showing a membership function of a temperature difference.

FIG. 16 is a diagram showing a membership function of a temperature rise rate.

FIG. 17 is a diagram showing a fuzzy set of shutter opening / closing degrees.

FIG. 18 is a diagram showing an operation pattern of a conventional heat storage method.

[Explanation of symbols]

 3 ... Heat storage heater, 4 ... Heat storage material, 12 ... Blower motor, 20 ... Main control part, 21 ... Information analysis part, 23 ... Room temperature sensor, 24 ... Heat storage material temperature sensor, 14a ... Temperature setting part, 14b ... Room size Setting unit, 26 ... Fuzzy inference unit, 27 ... Membership function memory unit.

Claims (2)

[Claims] 1. An electric air blower that stores heat in a heat storage material and then sends the heat stored in the heat storage material as hot air, in a temperature sensor that detects an ambient temperature, and a heat storage that detects the temperature of the heat storage material. A material temperature sensor, a heat storage temperature calculation means for obtaining a heat storage temperature for the heat storage material based on at least a detected temperature and a set temperature of the temperature sensor, and a heat storage temperature and the heat storage material temperature sensor obtained by at least the heat storage temperature calculation means And a heat storage time calculating means for obtaining a heat storage time required to store the heat storage material at the heat storage temperature based on the detected temperature of the electric hot air blower. 2. An electric warmer that stores heat in a heat storage material, and then blows the heat stored in the heat storage material as hot air. A temperature sensor that detects an ambient temperature; and a heat storage that detects the temperature of the heat storage material. A material temperature sensor, having a membership function of at least the temperature difference between the ambient temperature and the set temperature, and performing fuzzy inference based on at least the temperature detected by the temperature sensor and the set temperature, the heat storage temperature for the heat storage material And a membership function of a temperature difference between at least the heat storage material temperature and the heat storage temperature obtained by the first fuzzy calculation means, and at least the heat storage temperature and the heat storage material temperature sensor. Fuzzy inference based on the detected temperature of the second fuzzy to obtain a heat storage time required to store the heat storage material at the heat storage temperature. Electric fan heater, characterized by comprising a calculation means.