JP2909538B1 - Wavelength-selective heat radiation material for heating and heating - Google Patents

Abstract

The present invention provides a heat radiation wavelength-selective heat radiation material as a heat radiation source used for heating and heating by heat radiation. A heat radiation material for heating a human body or the like by heat radiation from a heating device such as a stove or the like, wherein a silicon monoxide film is formed on a metal substrate. A wavelength-selective heat radiation material for heating and heating that selectively reduces external light absorption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating technology or a heating technology, and more particularly to a heat radiation wavelength-selective heat radiation material as a heat radiation source used for heating and heating by heat radiation. .

[0002]

2. Description of the Related Art Heating apparatuses can be categorized into a radiant heating apparatus mainly by radiating infrared light, a hot air heating apparatus by forced circulation of hot air, and a convection heating apparatus using both of them. In addition, a heating device at a factory or a farm or a heating device for drying wood or the like is basically the same as a heating device except for a method of bringing a high-temperature object into close contact with a target object, and is a radiation type, a hot air type, It can be classified as a convection type.
Among them, the convection type heating and heating device using radiation or heat radiation requires heat resistance and high infrared emissivity as a heat radiation source that emits infrared light at high temperature. Glasses or ceramics have been used.

On the other hand, air on the earth generally absorbs infrared light, but it is known that the transmittance of infrared light is high in a wavelength range of 8 to 13 μm called “atmospheric window” ( Edited by the Japan Solar Energy Society, Handbook for Solar Energy Utilization (1985), p. 45). In addition, the absorptance of infrared light by air in a region other than the window of the atmosphere can be easily obtained by using a normal infrared spectroscope. When actually measured, the absorption coefficient at a humidity of 30% is about It was 1 m ^-1 . Therefore, most of the infrared light outside the window region of the atmosphere does not reach the distance of about 3 m or more, and is absorbed by the air.

[0004] The heat radiating material of the above-mentioned conventional radiant heating device or convection heating device radiates infrared light in a wide range from near-infrared region to far-infrared region without any selection. In other wavelength ranges, air is heated by absorbing infrared light by air, and indirectly supplies heat to the human body or object to be heated from the air to achieve heating and heating. In the wavelength region described above, radiation from the heat radiation material is directly received by the human body or the like to realize heating and heating. However, heating and heating via air takes time, and a large amount of air needs to be heated, especially when heating large spaces such as halls, factories, and farms that are more than 3 meters away. There was a large energy loss. Therefore, there has been a demand for a heat radiation material that can reduce the absorption of infrared light by air, can use infrared light emitted from a heat radiator directly for heating and heating, and consumes less wasteful energy.

[0005]

Under such circumstances, the present inventors, in view of the above prior art, reduced the absorption of infrared light by air and enabled efficient heating by infrared light. As a result of intensive studies with the aim of developing a new heat radiation material, we have found that a radiation material with a silicon monoxide film formed on a metal substrate is useful as a wavelength-selective heat radiation material. completed. The present invention has been proposed in view of the above, and relates to a wavelength-selective heating radiation material for heating and heating, wherein a silicon monoxide film is formed on a metal substrate.

[0006]

The present invention for solving the above problems comprises the following technical means. (1) A heat radiation material for heating a human body or the like by heat radiation from a heating device such as a stove, wherein a silicon monoxide film is formed on a metal substrate; A wavelength-selective heat radiation material for heating and heating that selectively reduces light absorption. (2) A heat-radiating material intended to be heated by heat radiation during the drying process of a product at a factory or a farm, wherein a silicon monoxide film is formed on a metal substrate. A wavelength-selective heat radiation material for heating and heating that selectively reduces external light absorption. (3) A heat-radiating material comprising a metal film formed on a substrate and a silicon monoxide film formed on the metal film,
(1) having a specific high emissivity in the wavelength region of m
Or the wavelength-selective heat radiation material for heating and heating according to (2).

[0007]

Next, the present invention will be described in detail. In the present invention, as described above, a wavelength-selective radiation material obtained by forming a silicon monoxide film on a metal substrate is used. Above, the silicon monoxide film gives a high emissivity in the wavelength region of the “atmospheric window”, and is not limited to a pure silicon monoxide film as long as the emissivity is low in other wavelength regions. Instead, it may be mixed with other substances. Also,
The method for forming the silicon monoxide film can be a sputtering method or another known method, and is not particularly limited. Further, as the metal substrate, any material may be used as long as it has a high reflectance in an infrared region and withstands a high temperature of about 300 degrees Celsius or more, and a metal thin film is formed on a substrate such as another glass. May be done. The shape and dimensions are not particularly limited. Further, a transparent coating in the infrared region may be provided on the uppermost surface after the formation of the silicon monoxide film, so that the design property is improved or the physical protection effect is maintained. The wavelength-selective heat radiating material of the present invention has a specific high emissivity in the wavelength range of 8 to 13 μm, and is a heat radiating material for heating a human body or the like. It is useful as a heat radiating material for heating and heating in a space, but is not limited thereto, and is appropriately used for the same purpose.

[0008]

Next, the present invention will be specifically described based on examples. However, the present invention is not limited by the embodiments. Example A wavelength-selective heat-radiating material according to an example of the present invention shown in FIG. 1 uses a glass plate 1 of 52 mm × 76 mm and a thickness of 1 mm as a substrate, forms an aluminum film 2 by vacuum evaporation, It has a configuration in which a silicon monoxide film 3 is formed on the upper surface. The thickness of the aluminum film 2 is a value sufficient to prevent transmission of infrared light, and the thickness of the silicon monoxide film 3 is 1 μm. The thickness of the aluminum film 2 is not particularly limited as long as it is impermeable to infrared light.
FIG. 2 shows the infrared reflection spectrum of the above wavelength-selective heat emitting material.
Shown in As can be seen from this figure, considering that the reflectivity is low in a part of the wavelength range of 8 to 13 μm called “the window of the atmosphere” and that the material is opaque, the absorptance or emissivity in this wavelength range is high. It turns out that it is high.

The radiant material was heated to about 300 degrees Celsius, and the temperature change of the wavelength-selective heat radiating material after turning off the heat source was recorded in a room at a temperature of 21.5 degrees. As a result, the temperature of the material dropped at a rate of 130 degrees Celsius per minute. This temperature drop is considered to be due to heat conduction due to contact with air and infrared light emission in the wavelength region where emissivity is high. The heat conduction by contact with air contributes to heating by warming air, and the emission of infrared light can contribute to directly heating a target object.

Comparative Example A glass plate having the same size as that of the above-described embodiment was used as a substrate, and a black paint was applied on the upper surface of the glass plate as a radiating material. Figure 3 shows the infrared reflection spectrum of this material. This material is also opaque, and FIG. 3 shows that the spectral emissivity of this material is high throughout the infrared region.

With respect to this material, the temperature decrease was recorded under the same conditions as in the examples. As a result, 1 degree Celsius per minute
It was found that the temperature dropped at a rate of 39 degrees. This temperature drop is considered to be due to heat conduction due to contact with air and infrared light emission in the entire infrared region. In infrared light radiation, direct heating of the target object is possible in the wavelength region of the "atmospheric window", but outside this wavelength region, the air is heated in the same way as heat conduction by contact with air This contributes to indirect heating. Due to infrared radiation in wavelength regions other than the "atmospheric window", the rate of temperature decrease is greater than in the example.

The difference in the rate of temperature decrease between the embodiment and the comparative example is due to the difference in the wavelength region that emits infrared light.
That is, in the radiator of the embodiment, by suppressing infrared radiation outside the wavelength range of the “window of the atmosphere”, it is possible to reduce the time-consuming process of absorbing infrared light into air and heating the target object. Means that Therefore, when the same energy is applied to the radiator of the example and the comparative example to heat an object located at a distance of several meters or more, the radiator of the example is more efficient than the radiator of the comparative example in infrared light. Heating is possible. When the target object is a human body, the radiator of the embodiment enables more efficient heating. In addition, when the radiator is placed in a heat-insulating box with a front surface that is transparent in the infrared region, heat conduction to air by contact is reduced, and as a result,
Further, the energy saving effect is increased.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and can be implemented in any manner unless the configuration described in the claims is changed. be able to.

[0014]

As described above, the wavelength-selective heat radiating material for heating and heating according to the present invention has a property that the silicon monoxide film on the metal substrate radiates heat only in the region of "atmospheric window". Utilization is used to enable highly efficient heating. Therefore, by using the heat radiating material of the present invention, the absorption of infrared light by air can be reduced, and the infrared light emitted from the heat radiator can be directly used for heating and heating. Energy consumption is reduced, and the cost of heating and heating in large spaces such as halls, factories, and farms is expected to be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a configuration of a wavelength-selective heat radiation material for heating and heating according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an infrared reflection spectrum of a wavelength-selective heat-radiating material for heating and heating used in one example of the present invention.

FIG. 3 is an explanatory diagram showing an infrared reflection spectrum of a radiation material obtained by applying a black paint on a glass substrate used in a comparative example.

[Explanation of symbols]

 Reference Signs List 1 glass substrate 2 aluminum film 3 silicon monoxide film

Claims (3)

(57) [Claims] 1. A heat radiation material for heating a human body or the like by heat radiation from a heating device such as a stove, wherein a silicon monoxide film is formed on a metal substrate. A wavelength-selective heat radiation material for heating and heating that selectively reduces the absorption of infrared light. 2. A heat radiation material for heating by heat radiation in a drying process of a product in a factory or a farm, wherein the air is formed by forming a silicon monoxide film on a metal substrate. A wavelength-selective heat-radiating material for heating and heating, which selectively reduces infrared light absorption by heating. 3. A heat radiating material comprising a metal film formed on a substrate and a silicon monoxide film formed on an upper surface thereof.
The wavelength-selective heat radiation material for heating and heating according to claim 1 or 2, wherein the heat radiation material has a specific high emissivity in a wavelength region of １３13 μm.