JPS6345028B2 - - Google Patents

Description

[Detailed Description of the Invention] Solar radiation that passes through the window glass surface provided at the opening of a building and enters the room becomes a heating heat source during the heating period in winter, but conversely, during the cooling period in summer. It becomes a heat load.

Therefore, in order to reduce the heat load of air conditioning, it is desirable to reflect as much sunlight as possible in the summer, and to transmit sunlight and bring it into the room in the winter.

This project was proposed to meet these demands and further improve the heat collection efficiency of solar heat collection devices installed on the exterior walls. is inclined so that the angle of incidence of sunlight on the glass surface in summer is equal to or greater than a predetermined angle that limits the amount of solar radiation transmitted to the indoor side, and the outer wall surface is capable of absorbing heat from the reflected light from the inclined window glass surface. This invention relates to a solar heat collecting device using an inclined window, characterized in that the solar heat collecting device is arranged at an inclined angle.

Figures 1 and 2 are graphs showing the transmittance characteristics of normal transparent glass and heat-reflective glass, respectively, depending on the angle of incidence of sunlight.The graphs show that when the angle of incidence exceeds a certain angle, the amount of solar radiation transmitted suddenly increases. can be seen to decrease.

The present invention takes advantage of these characteristics of glass and seasonal differences in solar altitude to tilt the glass surface of the window glass installed at the opening of a building at a predetermined angle or more, thereby improving cooling during the summer cooling period. By reflecting as much sunlight as possible inside, we reduce the amount of solar radiation transmitted to the indoor side.
This aims to reduce the heat load on air conditioners.

Furthermore, in the present invention, a solar heat collecting device is arranged on the outer wall surface at a predetermined inclination angle, and as described above, the increase in reflected solar radiation generated by inclining the window glass surface at a predetermined angle or more is collected. It is possible to improve the heat collection efficiency of the solar heat collection device by making it possible to collect heat.

The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes a window glass disposed in an opening of a building 2, and the inclination angle of the glass surface of the window glass 1 is such that the incident angle θ of sunlight on the glass surface in summer is equal to or greater than a predetermined angle. This limits the amount of solar radiation that passes through the surface and enters the room.

Furthermore, below the window glass 1, a solar heat collector 4 is arranged on the outer wall 3 at an inclination angle that can absorb the reflected light from the window glass 1 surface, and the window glass 1 is tilted at a predetermined angle or more. The heat collecting effect of the solar heat collecting device 4 is improved by collecting the increased amount of reflected solar radiation caused by the solar heat collecting device 4.

When a general window glass receives solar radiation at an incident angle θ on its glass surface, the amount of direct solar radiation J〓 on the window glass surface and the amount of direct solar radiation that passes through the glass surface and enters the room
J〓 _R is expressed by the following formulas (1) and (2), respectively.

J〓＝J _oD・cosθ……(1) (J _oD : Direct solar radiation on the normal surface) J〓 _R ＝τ・J _oD ……(2) (τ: Transmittance at incident angle θ) Furthermore This angle of incidence θ is determined by the position of the sun, the direction of the window surface, and the inclination angle, and is given by the following equation (3).

cosθ=sinh・cosγ+cosh・cos(A−α)・sinγ……(3) (h: Sun altitude A: Solar azimuth angle γ: Inclination angle of the window surface with respect to the horizontal plane α: Azimuth angle of the window surface) Therefore, the building Given the orientation of the window, the type of window glass, and the location of the building (latitude, longitude), determine the inclination angle of the window surface using the transmittance characteristics of the glass shown in Figures 1 and 2. This allows solar radiation to pass through the glass surface in the winter, and conversely, to reflect the solar radiation on the glass surface in the summer, preventing it from penetrating into the room.

Next, specific examples to which the present invention is applied will be described.

Figure 4 shows the plane of a building 2 to which the present invention is applied, located at latitude 38°15' north and longitude 140°21' east, with window surfaces 5
This shows an example of a plan that deviates from the south to the west at an azimuth angle of +33°, and the type of glass is usually transparent glass.

Figure 5 shows a normal vertical window and an inclined window according to the present invention (inclination angle = 100°, 110°, 120°) during the summer cooling season.
Figure 6 shows the calculation results of the change in the angle of incidence for each standard time, and Figure 6 similarly shows the calculation results for the winter heating season.

From the above two charts, if the inclination angle of the window glass surface is 110 degrees in the example shown in FIG. The angle of incidence can be suppressed to 75°, and the angle of incidence can be increased by approximately 15° compared to a normal vertical window with an inclination angle of 90°. In addition, as shown in Figure 6, the change in the incident angle of vertical windows and inclined windows during the winter heating season becomes large when the incident angle is less than 60°, which does not affect the change in transmittance, and therefore the amount of solar radiation transmitted through inclined windows decreases. I can't see it.

Further, the solar radiation reflected from the window surface of the inclined glass window is collected by the solar heat collecting device 4.
As is well known, solar radiation incident on a glass surface is divided into those transmitted through the glass, reflected, and absorbed, and the following relational expression is established between the transmittance τ, the reflectance ρ, and the absorption coefficient α.

τ+ρ+α=1...(3) Therefore, by tilting the glass surface, the first
As is clear from the figure and the graph of FIG. 2, the transmittance decreases, and conversely, the reflectance increases. Therefore, by installing the solar heat collector at the bottom of the window surface at an angle that allows the solar heat collector to collect the sunlight reflected from the glass surface, it is possible to improve the heat collection efficiency of the solar heat collector installed on the outer wall. be.

Although the present invention has been described above with reference to embodiments, various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

1 and 2 are charts showing the transmittance characteristics of ordinary transparent glass and heat ray reflective glass, respectively; FIG. 3 is a longitudinal cross-sectional side view showing one embodiment of the device of the present invention; and FIG.
The figure is a floor plan of a building equipped with the device of the present invention, and Figures 5 and 6 show the incident angles of normal vertical windows and tilted windows used in the device of the present invention at different standard times in summer and winter, respectively. This is a chart showing the changes. 1...Window glass, 4...Solar heat collector.

Claims (1)

[Claims] 1 Glass windows installed in the openings of buildings are tilted so that the angle of incidence of sunlight on the glass surface in the summer is at least a predetermined angle that limits the amount of solar radiation transmitted indoors, and A solar heat collecting device using an inclined window, characterized in that the solar heat collecting device is arranged at an inclination angle that allows heat absorption of reflected light from the inclined window glass surface.