JP7149511B2 - Solar shading glass and solar shading window provided with the same - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law Publication through telecommunication lines Posting date December 4, 2017 Posting address (1) http://www. mlit. go. jp/jutakukentiku/house/jutakukentiku_house_tk4_000083. html (2) http://www. mlit. go. jp/jutakukentiku/house/jutakukentiku_house_tk4_000146. html (3) http://www. mlit. go. jp/common/001211773. pdf

The present invention relates to a solar shielding glass comprising thermochromic glass and a solar shielding window comprising the same.

BACKGROUND ART Conventionally, as thermochromic glass, there has been known a laminated glass configured by interposing an intermediate film between a first laminated glass member and a second laminated glass member (see Patent Document 1). The intermediate film is configured by sandwiching a thermochromic layer between the first resin layer and the second resin layer. The thermochromic layer contains vanadium dioxide or the like, and has the characteristic that the infrared transmittance changes according to temperature changes. In this laminated glass, the infrared transmittance of the first resin layer is set higher than the infrared transmittance of the second resin layer.

JP 2015-164892 A

By the way, in the laminated glass described in Patent Document 1, infrared rays (heat rays) transmitted through the first laminated glass member, the first resin layer, and the thermochromic layer have a lower infrared transmittance than the first resin layer. 2, the infrared rays transmitted through the second resin layer and the second laminated glass member, that is, the infrared rays transmitted through the entire laminated glass can be used to raise the temperature of the thermochromic layer. Can not.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a solar shielding glass and a solar shielding window having the same that can accelerate the temperature rise of the thermochromic glass by utilizing infrared rays transmitted through the thermochromic glass.

The solar radiation shielding glass of the present invention comprises a thermochromic glass having a characteristic that the amount of transmitted solar radiation decreases as the temperature of the glass increases, while the amount of transmitted solar radiation increases as the temperature of the glass decreases; and a heat shielding film, wherein the heat shielding film is formed on the indoor surface of the thermochromic glass.
According to the solar shielding glass of the present invention, the heat shielding film formed on the indoor surface of the thermochromic glass shields infrared rays transmitted through the entire thermochromic glass by absorption or reflection. For this reason, heat is transferred from the heat shielding film whose film temperature rises due to the absorption of infrared rays to the thermochromic glass, and the infrared rays reflected by the heat shielding film are returned to the thermochromic glass, thereby increasing the temperature of the thermochromic glass. It can promote the increase in glass temperature. As a result, when the amount of solar radiation increases and the outdoor temperature rises, the amount of solar radiation blocked by the solar radiation shielding glass can be quickly increased compared to, for example, thermochromic glass in which a heat shielding film is not formed on the indoor surface. It is possible to suppress the amount of heat entering the indoor space from the solar shielding glass.

In the solar shielding glass of the present invention, the heat shielding film may be composed of a heat absorbing film having properties of transmitting visible rays and absorbing infrared rays.
According to such a configuration, it is possible to suppress the influence of the heat-absorbing film on visible light transmitted through the thermochromic glass, and to absorb infrared rays transmitted through the thermochromic glass by the heat-absorbing film. By absorbing infrared rays in this way, the temperature of the heat-absorbing film rises, and heat is conducted from the heat-absorbing film to the thermochromic glass, thereby accelerating the temperature rise of the thermochromic glass.

In the solar shielding glass of the present invention, the infrared transmittance of the heat-absorbing film may be lower than the infrared transmittance of the thermochromic glass.
According to such a configuration, the infrared rays transmitted through the thermochromic glass can be blocked by the heat absorbing film, so that the amount of heat entering the indoor space through the solar shielding glass can be suppressed.

In the solar shielding glass of the present invention, the visible light transmittance of the heat absorbing film may be higher than the visible light transmittance of the thermochromic glass.
According to such a configuration, the visible light that has passed through the thermochromic glass can also be transmitted through the heat-absorbing film, and the influence of the heat-absorbing film on the visible light can be suppressed.

In the solar shielding glass of the present invention, the heat shielding film may be composed of a heat ray reflecting film having properties of transmitting visible light and reflecting infrared rays.
According to such a configuration, it is possible to suppress the influence of the heat ray reflective film on visible light that passes through the thermochromic glass, and to reflect infrared rays that have passed through the thermochromic glass by the heat ray reflective film. By reflecting the infrared rays and returning them to the thermochromic glass in this manner, it is possible to accelerate the temperature rise of the thermochromic glass.

In the solar shielding glass of the present invention, the infrared transmittance of the heat reflective film may be lower than the infrared transmittance of the thermochromic glass.
According to such a configuration, the infrared rays transmitted through the thermochromic glass can be blocked by the heat reflective film, so that the amount of heat entering the indoor space through the solar shielding glass can be suppressed.

In the solar shielding glass of the present invention, the visible light transmittance of the heat ray reflective film may be higher than the visible light transmittance of the thermochromic glass.
According to such a configuration, the visible light that has passed through the thermochromic glass can also be transmitted through the heat reflective film, and the influence of the heat ray reflective film on the visible light can be suppressed.

A solar shading window of the present invention is a solar shading window installed in an opening of a building wall, and is characterized by comprising a frame and the above-described solar shading glass of the present invention attached to the frame. and
According to the solar radiation shielding window of the present invention, it is possible to construct a solar radiation shielding window that exhibits the same effects as those of the above-described solar radiation shielding glass of the present invention.

ADVANTAGE OF THE INVENTION According to this invention, the solar radiation shielding glass which can accelerate the rise of the glass temperature of thermochromic glass using the infrared rays which permeate|transmitted the thermochromic glass, and a solar radiation shielding window provided with the same can be provided.

The schematic diagram which shows the solar radiation shielding window which concerns on embodiment of this invention. 4 is a graph showing the spectral transmittance of the solar shielding window according to the embodiment; 5 is a graph showing the spectral characteristics of the heat shielding film for the solar shielding window according to the embodiment; 4 is a graph showing the relationship between the glass temperature of the solar radiation shielding window and the amount of solar radiation according to the embodiment;

[Configuration of this embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
In FIG. 1, a solar shielding window 1 according to this embodiment is constructed by installing a solar shielding glass 10 through a window frame 4, which is a frame body, to an opening 3 of a building wall 2. As shown in FIG. The solar shielding glass 10 includes a rectangular tabular thermochromic glass 20 and a sheet-like heat shielding film 30 attached to the indoor surface 22 of the thermochromic glass 20 as a heat shielding film. The heat shielding film 30 is attached to the entire surface of the indoor surface 22 exposed to the indoor space. The outdoor surface 21 of the thermochromic glass 20 is not attached with the heat shielding film 30 or the like, and is exposed to the outdoor space.

The thermochromic glass 20 is configured by providing a thermochromic layer containing a transition metal oxide such as vanadium dioxide on transparent glass. The thermochromic glass 20 has a thermochromic phenomenon in which the transmittance of the amount of solar radiation changes according to changes in the glass temperature. It has the characteristic of increasing the amount of transmitted solar radiation. In this embodiment, the thermochromic glass 20 has the property that the visible light transmittance mainly changes with changes in the glass temperature.

The graph of FIG. 2A shows the spectral transmittance of the thermochromic glass 20. As shown in FIG. In this graph, the vertical axis is the solar radiation transmittance (%), the horizontal axis is the solar radiation wavelength (nm), and the glass temperatures are 20°C, 40°C, 50°C, and 70°C. The wavelength relationships are shown separately for each line type.
Here, in this embodiment, the wavelength range of visible radiation has a short wavelength limit of 360 nm to 400 nm and a long wavelength limit of 760 nm to 830 nm, and this wavelength range is defined as a visible light region. As for the wavelength range of infrared radiation, the wavelength range in which the wavelength of the monochromatic light component is longer than the wavelength of the visible radiation and the short wavelength limit is 760 nm to 830 nm is defined as the infrared region.

In the graph of FIG. 2(A), the visible light transmittance of the thermochromic glass 20 in the visible light range changes more than the infrared transmittance in the infrared range as the glass temperature changes from 20° C. to 70° C. . Specifically, when the wavelength is about 600 nm in the visible light region, the change in visible light transmittance is large. , the visible light transmittance is about 15%, and the change range of the visible light transmittance is approximately 50%. On the other hand, in the infrared region, when the wavelength is about 1000 nm, the change in infrared transmittance is large. rate is about 47%, and a change in infrared transmittance of approximately 15% is observed. As described above, the visible light transmittance changes by about 50% as the glass temperature of the thermochromic glass 20 changes from 20° C. to 70° C., whereas the infrared transmittance changes only by about 15%.

In the graph of FIG. 2A, when the glass temperature of the thermochromic glass 20 is 20° C., the visible light transmittance is about 73% at a wavelength of about 800 nm in the visible light region, whereas the wavelength in the infrared region is about 73%. At about 1600 nm, the infrared transmittance is about 70%. Therefore, when the glass temperature is lowered, the visible light transmittance and the infrared transmittance of the thermochromic glass 20 are approximately the same (including a difference of several percent). On the other hand, when the glass temperature of the thermochromic glass 20 is 70° C., the visible light transmittance is about 15% at a wavelength of about 600 nm in the visible light region, whereas the infrared transmittance is about 31% at a wavelength of about 1700 nm in the infrared region. is. Therefore, when the glass temperature rises, the visible light transmittance of the thermochromic glass 20 becomes lower than the infrared transmittance.

The heat shielding film 30 is composed of a sheet-like heat ray absorbing film as a heat ray absorbing film having a property of mainly absorbing infrared rays (heat rays).
The heat-absorbing film has, for example, a structure in which resin films such as polyester are laminated.

The graph of FIG. 3(A) shows the spectral characteristics of the heat-absorbing film. In this graph, the vertical axis is the solar radiation transmittance/absorption rate (%), the horizontal axis is the solar radiation wavelength (nm), and the solid line shows the relationship between the transmittance and wavelength of the heat ray absorbing film. The relationship between the absorptance of the absorbing film and the wavelength is indicated by a dotted line.
The graph of FIG. 3(A) shows that the heat-absorbing film has the property of transmitting visible light with little absorption, while absorbing a large amount of infrared light and not transmitting much of it. Further, the visible light transmittance of the heat-absorbing film is higher than the visible light transmittance of the thermochromic glass 20, and the infrared transmittance of the heat-absorbing film is lower than the infrared transmittance of the thermochromic glass 20. I know there is.

The graph of FIG. 2(B) shows the spectral transmittance of the solar shielding glass 10 of this embodiment, in which a heat absorbing film is attached as the heat shielding film 30 to the indoor surface 22 of the thermochromic glass 20 . In this graph, the vertical axis is the solar radiation transmittance (%), the horizontal axis is the solar radiation wavelength (nm), and the glass temperatures are 20°C, 40°C, 50°C, and 70°C. The wavelength relationships are shown separately for each line type.
In the graph of FIG. 2(B), the change range of the visible light transmittance of the solar shielding glass 10 is the same as that of the thermochromic glass 20 shown in the graph of FIG. 2(A). It can be seen that the range of change above a certain level is maintained. In addition, the visible light transmittance in the graph of FIG. 2B is suppressed to about 10% lower than the visible light transmittance in the graph of FIG. It can be seen that the visible light transmittance of the solar shielding glass 10 is little affected even when the heat absorbing film is attached to the indoor surface 22 .
On the other hand, in the graph of FIG. 2B, the infrared transmittance of the solar shielding glass 10 is significantly lower than the infrared transmittance of the thermochromic glass 20 shown in the graph of FIG. It is presumed that the reduced transmittance is absorbed by the heat-absorbing film, the film temperature of the heat-absorbing film rises, and heat is conducted to the thermochromic glass 20 .

The solar radiation shielding window 1 having the solar radiation shielding glass 10 attached to the window frame 4 with the heat absorbing film as the heat shielding film 30 attached to the indoor surface 22 of the thermochromic glass 20 operates as follows. Here, it is assumed that the outside air temperature (outdoor temperature) is higher than the room temperature (indoor temperature).
As shown in FIG. 1, when the thermochromic glass 20 receives solar radiation from the sun 5, the thermochromic glass 20 transmits visible light and infrared rays according to its transmittance and directly absorbs infrared rays that are not transmitted.
Next, when the heat-absorbing film receives sunlight transmitted through the thermochromic glass 20, the heat-absorbing film transmits visible light and absorbs infrared light according to its transmittance. Visible light that has passed through the heat-absorbing film enters the indoor space, but infrared rays are absorbed by the heat-absorbing film and hardly enter the indoor space. The rate of heat penetration into the indoor space with respect to the amount of solar radiation) can be kept low. In addition, since the film temperature of the heat-absorbing film rises due to the absorbed infrared rays, when the film temperature becomes higher than the glass temperature of the thermochromic glass 20, heat is conducted to accelerate the rise of the glass temperature.

When the amount of solar radiation received by the outdoor surface 21 of the solar shielding glass 10 increases as the amount of solar radiation from the sun 5 increases, the glass temperature of the thermochromic glass 20 directly absorbs the solar radiation and the heat from the heat-absorbing film increases. It rises quickly by conducting and acquiring heat. Therefore, the visible light transmittance of the thermochromic glass 20 quickly decreases, and the visible light shielding rate increases. In addition, when the amount of solar radiation received by the outdoor surface 21 of the solar shielding glass 10 decreases as the amount of solar radiation from the sun 5 weakens, the amount of direct sunlight absorbed by the thermochromic glass 20 decreases, and the heat absorption film The amount of heat taken from the thermochromic glass 20 is also reduced, and the glass temperature of the thermochromic glass 20 is lowered. Therefore, the visible light transmittance of the thermochromic glass 20 is increased, and the visible light shielding rate is decreased. Thus, the solar radiation shielding window 1 blocks solar radiation according to the amount of solar radiation.

The graph in FIG. 4 shows the relationship between the window surface solar radiation amount (W/m ² ) received by the outdoor surface 21 of the solar radiation shielding glass 10 and the glass temperature (° C.) as described above under an outside temperature of 30° C. and a room temperature of 25° C. , and the relationship between the window surface solar radiation amount (W/m ² ) and the glass temperature (° C.) for the thermochromic glass 20 alone to which the heat shielding film 30 is not attached.
The glass temperature of the thermochromic glass 20 alone rises from about 30° C. to about 46° C. while the amount of solar radiation on the window surface increases from 100 W/m ² to 900 W/m ² . On the other hand, the glass temperature of the solar shielding glass 10 (thermochromic glass 20 + heat absorbing film) changes from about 31° C. to about 55° C. while the amount of solar radiation on the window surface increases from 100 W/m ² to 900 W/m ² . rises to From this, it can be seen that the rate of increase in glass temperature with respect to the amount of solar radiation on the window surface is higher for the solar shielding glass 10 than for the thermochromic glass 20 alone.

In the solar shielding window 1 described above, the heat shielding film 30 attached to the indoor surface 22 of the thermochromic glass 20 has been described as a heat ray absorbing film, but it is not a heat ray absorbing film but a heat ray having a property of mainly reflecting infrared rays. A sheet-like heat ray reflective film may be used as the reflective film.
The heat ray reflective film has, for example, a structure in which resin films such as polyester are laminated.

The graph of FIG. 3(B) shows the spectral characteristics of the heat ray reflective film. In this graph, the vertical axis is the transmittance/reflectance (%) of solar radiation, the horizontal axis is the wavelength (nm) of solar radiation, and the relationship between the transmittance and wavelength of the heat ray reflective film is indicated by a solid line. A dotted line indicates the relationship between the reflectance of the reflective film and the wavelength.
The graph of FIG. 3(B) shows that the heat ray reflective film has the property of not reflecting much visible light but transmitting it, while reflecting much infrared light and not transmitting much of it. Also, it can be seen that the visible light transmittance of the heat reflective film is lower than the infrared transmittance of the thermochromic glass 20 .

The solar radiation shielding window 1 having the solar radiation shielding glass 10 attached to the window frame 4 with the heat reflective film as the heat shielding film 30 attached to the indoor surface 22 of the thermochromic glass 20 operates as follows. Here, it is assumed that the outside air temperature is higher than the room temperature.
As shown in FIG. 1, when the thermochromic glass 20 receives solar radiation from the sun 5, the thermochromic glass 20 transmits visible light and infrared rays according to its transmittance and directly absorbs infrared rays that are not transmitted.
Next, when the heat ray reflective film receives sunlight transmitted through the thermochromic glass 20, the heat ray reflective film transmits visible light and reflects infrared light according to its transmittance. Visible light that has passed through the heat ray reflective film is incident on the indoor space, but infrared rays are reflected by the heat ray reflective film and the amount of incident light to the indoor space is small. The heat penetration rate of is kept low. In addition, the infrared rays reflected by the heat ray reflective film are returned to the thermochromic glass 20, and the thermochromic glass 20 absorbs the reflected infrared rays, so that the glass temperature of the thermochromic glass 20 is increased.

When the solar radiation from the sun 5 intensifies and the window surface solar radiation received by the outdoor surface 21 of the solar shielding glass 10 increases, the glass temperature of the thermochromic glass 20 directly absorbs the solar radiation and reflects it on the heat reflective film. It rises quickly by absorbing the infrared rays. Therefore, the visible light transmittance of the thermochromic glass 20 quickly decreases, and the visible light shielding rate increases. In addition, when the amount of solar radiation received by the outdoor surface 21 of the solar shielding glass 10 decreases as the amount of solar radiation from the sun 5 weakens, the amount of direct sunlight absorbed by the thermochromic glass 20 decreases, and the heat reflective film The amount of infrared rays reflected to the outside is also reduced, and the glass temperature of the thermochromic glass 20 is lowered. Therefore, the visible light transmittance of the thermochromic glass 20 is increased, and the visible light shielding rate is decreased. Thus, the solar radiation shielding window 1 blocks solar radiation according to the amount of solar radiation.

[Effect of this embodiment]
(1) In the present embodiment, the solar shielding glass 10 is thermochromic glass 20 having a characteristic that the amount of transmitted solar radiation decreases as the temperature of the glass increases, while the amount of transmitted solar radiation increases as the temperature of the glass decreases. By attaching the heat shielding film 30 to the indoor surface 22 of the heat shielding film 30, the heat shielding film 30 can block the infrared rays transmitted through the entire thermochromic glass 20 by absorption or reflection, and the infrared rays absorbed or reflected can be used to generate the thermochromic glass. A rise in the glass temperature of the chromic glass 20 can be accelerated. As a result, when the amount of solar radiation of the sun 5 increases, the amount of solar radiation blocked by the solar radiation shielding glass 10 can be quickly increased, and the amount of heat entering the indoor space from the solar radiation shielding glass 10 can be suppressed. .
(2) When the heat shielding film 30 is composed of a heat-absorbing film having properties of transmitting visible light and absorbing infrared rays, the effect of the heat-absorbing film on the visible light transmitted through the thermochromic glass 20 can be suppressed. In addition, infrared rays transmitted through the thermochromic glass 20 can be absorbed by the heat-absorbing film, and the temperature rise of the thermochromic glass 20 can be accelerated.
(3) Since the infrared transmittance of the heat-absorbing film is lower than the infrared transmittance of the thermochromic glass 20, the infrared rays transmitted through the thermochromic glass 20 can be blocked by the heat-absorbing film. It is possible to suppress the amount of heat entering the
(4) Since the visible light transmittance of the heat-absorbing film is higher than the visible light transmittance of the thermochromic glass 20, the visible light transmitted through the thermochromic glass 20 can also be transmitted through the heat-absorbing film. It is possible to suppress the influence of the heat-absorbing film on visible light.
(5) When the heat shielding film 30 is composed of a heat ray reflective film having properties of transmitting visible light and reflecting infrared rays, the effect of the heat ray reflective film on the visible light transmitted through the thermochromic glass 20 can be suppressed. In addition, infrared rays that have passed through the thermochromic glass 20 can be reflected by the heat ray reflective film, and the temperature rise of the thermochromic glass 20 can be accelerated.
(6) Since the infrared transmittance of the heat reflective film is lower than the infrared transmittance of the thermochromic glass 20, the infrared ray transmitted through the thermochromic glass 20 can be blocked by the heat reflective film. It is possible to suppress the amount of heat entering the
(7) Since the visible light transmittance of the heat ray reflective film is higher than the visible light transmittance of the thermochromic glass 20, the visible light transmitted through the thermochromic glass 20 can also be transmitted through the heat ray reflective film. It is possible to suppress the influence of the heat ray reflective film on visible light.

[Modification]
In the above embodiment, the heat-absorbing film has the spectral characteristics shown in FIG. 2(A). It suffices that the material has a characteristic of absorbing infrared rays. In the above embodiment, the heat ray reflective film has the spectral characteristics shown in FIG. 2(B). It suffices if it has the property of reflecting infrared rays as much as possible.
In the above-described embodiment, the visible light transmittance of the heat-absorbing film is higher than that of the thermochromic glass 20, but the visible light transmittance may be about the same. In the above-described embodiment, the visible light transmittance of the heat ray reflective film is higher than the visible light transmittance of the thermochromic glass 20, but they may be of the same order.
In the above-described embodiment, the heat shielding film 30 is attached to the indoor surface 22 of the thermochromic glass 20, so the characteristics of the solar shielding glass 10 can be adjusted and changed by replacing it with another heat shielding film 30. For example, a heat reflective film can be replaced with a heat absorbing film.
In the above-described embodiment, the heat shielding film 30 is attached to the entire surface of the indoor surface 22 exposed to the indoor space, but it may be attached partially, for example, considering the angle of incidence of solar radiation. Alternatively, it may be attached to the upper and lower halves of the thermochromic glass 20 or the like.
In the above embodiment, the heat shielding film 30 is attached to the indoor surface 22 of the thermochromic glass 20, but the heat shielding film 30 is not limited to this and may be a heat shielding film formed by sputtering or the like.
The solar radiation shielding window 1 according to the above embodiment may be a fixed window (FIX window) in which the solar radiation shielding glass 10 is immovably fixed to the window frame 4, or a variety of types in which the solar radiation shielding glass 10 is attached to the window frame 4 so as to be openable and closable. may be a window of In addition, the solar shielding window 1 may be a multi-layered window including transparent glass or the like in addition to the solar shielding glass 10 .

1... Solar shielding window, 10... Solar shielding glass, 2... Building wall, 20... Thermochromic glass, 21... Outdoor surface, 22... Indoor surface, 3... Opening, 30... Heat shielding film, 4... Window frame (frame body ), 5... the sun.

Claims (4)

A thermochromic glass having a property that the amount of transmitted solar radiation decreases as the temperature of the glass increases, and the amount of transmitted solar radiation increases as the temperature of the glass decreases; Equipped with a heat shielding film that blocks infrared rays,
The heat-shielding film is composed of a heat-absorbing film having properties of transmitting visible light and absorbing infrared light,
The solar shielding glass, wherein the infrared transmittance of the heat absorbing film is lower than the infrared transmittance of the thermochromic glass. In the solar shielding glass according to claim 1,
The solar shielding glass, wherein the visible light transmittance of the heat absorbing film is higher than the visible light transmittance of the thermochromic glass. A thermochromic glass having a property that the amount of transmitted solar radiation decreases as the temperature of the glass increases, and the amount of transmitted solar radiation increases as the temperature of the glass decreases; Equipped with a heat shielding film that blocks infrared rays,
The heat shielding film is composed of a heat ray reflecting film having properties of transmitting visible light and reflecting infrared light,
The solar shielding glass, wherein the infrared transmittance of the heat reflective film is lower than the infrared transmittance of the thermochromic glass. A solar radiation shielding window installed in an opening in a building wall,
A solar shielding window comprising: a frame; and the solar shielding glass according to any one of claims 1 to 3 attached to the frame.

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