JPS596208Y2 - solar blinds - Google Patents

Description

[Detailed description of the invention] The present invention relates to a solar heat utilization device, and in particular an improvement of Venetian blinds that are installed near the windows of buildings to absorb or reflect solar heat rays and effectively utilize the air conditioning function within the building. Regarding.

Venetian blinds are a type of sunshade with a large number of slats made of thin metal plates arranged horizontally in parallel, and the inclination angle of the slats can be adjusted to block light and provide ventilation.

Hereinafter, Venetian blinds will be simply referred to as blinds.

BACKGROUND ART Devices that utilize blinds to absorb and reflect solar heat rays have been known.

This type of device has the upper surface of the slat of the blind as a solar heat ray reflecting surface and the lower surface as a solar heat ray absorbing surface, so that the solar heat rays incident on the slat upper surface are directed toward the lower surface of the slat without leaking into the interior or exterior of the building. The purpose is to reflect and absorb all the incident solar heat rays, effectively extracting them as heat.

However, since the altitude of the sun changes depending on the season and time, it is necessary to constantly adjust the inclination angle of the slats in the above-mentioned device in accordance with the changing altitude of the sun, resulting in a disadvantage that the structure of the device is complicated and expensive.

Also, if the slat inclination angle is kept constant and the structure is simplified, the slat width should be widened to absorb all the incident light, but if the slat width is too wide, scattered light from outside the building will be generated. It becomes difficult for people to enter the room, and the room becomes dark.

Furthermore, the blinds were bulky, which caused problems in architectural design.

The present invention aims to reduce the above-mentioned drawbacks of conventional devices.

According to the present invention, the cross section of the slat, which has a solar heat ray reflecting surface on the upper surface and a solar heat ray absorbing surface on the lower surface, is bent into a special shape, so that all of the solar heat rays incident on the upper surface of the slat are absorbed by the slat. The solar heat rays are reflected toward the solar heat absorbing surface on the lower surface of the slat adjacent above and converted into heat.

Moreover, the present invention achieves the above object by keeping the inclination angle of the slats constant during the period from October to April when heating is required.

The present invention will be described in detail with reference to Examples below.

If the installation area of the device of the present invention is set at 35° north latitude, the sun's altitude at mid-south time at the vernal and autumnal equinoxes is 55°.

On the other hand, considering that the heat rays contained in the sun's rays at sunset become weak, it is assumed that the maximum solar altitude targeted by the device of the present invention is 60° and the minimum solar altitude is 10° for the months from October to April.

A similar slat 2 is arranged above and adjacent to the slat 1 whose upper surface is made of shiny aluminum or the like to serve as a solar heat reflecting surface, and whose lower surface is painted black or treated with a selective absorption film to serve as a solar heat absorbing surface.
are arranged in parallel (Fig. 1).

The heat ray 60X at the highest altitude (60°) enters the front edge A of the slat 1 on the outdoor side, and after being reflected on the upper surface of the slat 1, the heat ray 60X passes through the front edge A' of the slat 2.
The inclination angle α1 of the front portion, that is, the first inclined portion 1a, is 15° (this angle of 15° is the upper limit of the inclination angle at which the enclosed hot wire does not escape to the outside).

) Similarly, the upper limit of the inclination angle α1 of the first inclined portion 2a of the slat 2 is 15°.

However, what happens if the slats are shaped with this angle of inclination α1? In order to receive heat rays at a low altitude, the slat width becomes excessively wide, so it is necessary to increase the inclination angle α1 of the slat from the middle of the slat.

In FIG. 2, the points at which each slat is bent are designated as B and B', and the second inclined portions bent upward behind B and B' are designated as 1b and 2b, respectively.

In order to prevent the highest altitude heat ray 60Y that has passed through the front edge A' of the slat 2 and entered the slat 2 from reflecting on the upper surface of the second inclined part 1b of the slat 1 and escaping to the outside, the reflected light must be directed to the slat 2 again. The slope angle α2 of the slope portion 1b may be selected so as to pass through the front edge A'.

In other words, the inclination angle α2 at which the angle of incidence and the angle of reflection are the same is 3.
0° is the upper limit, and if the intersection point between the highest altitude hot wire 60Y and the slat 1 is selected as B, this point B becomes the limit of the bending point close to the front edge A.

Next, the lowest altitude (10°) passing through the front edge A' of slat 2
The point where the hot wire 10X intersects with the second slope 1b of the slat 1 is C, and the slat 1 is bent downward at the point C to form the sub slope part 1C.
(Figure 3).

The sub-inclined part 2C of the slat 2, which is bent at point C in the same manner and shaped, is on the upper surface of the first inclined part 1a of the slat 1 and has a length necessary to catch the heat rays 10Y reflected at point B. SaC
'D' is sufficient. Therefore, in order to minimize the length of C'D', it is sufficient to find point D' so that C'D' is orthogonal to the reflected heat line of IOY.

Find CD similar to C'D'.

The above relationship will be generalized and explained.

In Figure 4, the highest altitude is 08 and the lowest altitude is θ.

, the distance between the slats 1 and 2 is d, and the inclination angle and projected length of the first slope part, second slope part, and sub-slope part of each slat 1 and 2 are α1, α2, α3, and l1, l2, l3, respectively. Then, α. = (90° - θx) / 2
... Tsukasa 1) α2 = 900 - θX
・・・・・・(2α3=θn + 2α
1+9 (7)・----・Determining 43d, l1
, l2, l3 are determined by multiples of d.

11=d/(tuα111θx)
−・−−−<41A' B = l L /θX Therefore, C B = A' B/tw (θn+α2)=
l t /cosθx・tu(θn+α2)12=c
Bcmα! = (lt/cosθx・tan(
θn+α2)}■α2-(511 3 = Kens
(2α!〒θn) sin (2α1+θn)
--(6) However, K=2d (7xt)J'It +g2tar+(2α
1+θn)”(4+gz)tgθn) As an example, θx
=60° θn=1 (If F, αl=(90'-6
0°)/2=15° α2=900 60°=300 α3 =1 0'+2X 1 5°+90'=130
Pll=d/(tan 1 5°+-60°)
=d/(0.268+1.73)=d/2.0=0.5
dlz =llcas30'/cas6cy:l-ta
n40°"" llO. 8 6 6 / 0.5 X
O. 8 3 9 = 2.0 6 4 = d 2.0
6/2.

O=1.03d1 3 = Kcos (3 0'+
10') m4 0'= K O. 7 6 6 X O.
64 3=0.493KK=2d (lltan1
5°+l2tan40°+(lt+g2) ・tanl
O°=2d (40.268+lz0.839+(4+
Jz)0.176)=2d-(0.5XO.
26 8 d+1.0 3X0.8 3 9 d+0.
176 (0.5 d + 1.03 d) = 2 d - (0.1
34d+0.864d+0.269d)=2d-1.2
67d=0.733dls=0.733ax0.493=0.361dl
l+11x +l3=0.5 d+1.03d+o. 3
6 1 d=1.89 1 d Therefore, if d=20, then It +4 + A's ki 378 order...
...(7) The incident area of the scattering destination outside the building in such a blind, that is, the opening area is (l1 + 7 2)
tanθ.

Also, the opening ratio is (l 1 + l 2) tanθ.

/d. θx−60°, θ.

= 10°, :A mouth ratio = 1.5 3 d Xt
an107d=1.53X0.176 out of 0.27 -=
i'8) As can be seen from equations (7) and (8), the blind according to the present invention can be said to have sufficiently practical dimensions and ratios.

Since the present invention is constructed as described above, there is no need to constantly adjust the slat inclination angle of the blind due to the changing solar altitude, and the heat rays incident on the top surface of the slat with a fixed inclination angle can escape indoors and outdoors. All of this can be reflected and absorbed by the bottom surface of the slats and used for air conditioning inside buildings.

Furthermore, although the cross section of the slat is bent and changed, the aperture ratio of the blind can be made sufficiently large, so that the natural illumination of the room due to scattered light is not reduced.

Also, like regular blinds, the slats can be stacked one on top of the other.

[Brief explanation of drawings]

1 to 4 are schematic diagrams illustrating the principle of the present invention. 1, 2...slat, la, 2a...
First inclined part of slat, lb, 2b... Second inclined part of slat, 1C, 2C... Sub-inclined part of slat, α1... Low inclination angle, α2・・・・・・
High inclination angle, A, A'...Front edge of slat, 1
0Y...Low altitude solar heat rays, 60X, 60Y.
...High-altitude solar heat rays.

Claims (1)

[Scope of claim for utility model registration] 1. In a blind formed on a building by arranging a large number of plate-like slats in horizontal parallel fashion, each of which has a solar heat reflecting surface on its upper surface and a solar heat absorbing surface on its lower surface, the above-mentioned plate-like slat 1
, 2 from the outside to the inside of the building, the main slope part 1a,
1b, 2a, 2b and sub-slanted parts IC, 2C bent downward from the rear end edge of the main sloped part. 2. The main slope part is a first slope part 1a with a low slope angle α1,
2a, and a second slope having a high inclination angle α2 that is continuous with the first slope part.
A solar heat-utilizing blind according to claim 1 of the utility model registration claim, which has sloped portions 1b and 2b. 36 The maximum value of the low inclination angle α1 is determined by the high altitude solar heat rays 60X incident on the front edge A of the slat 1 at the first inclined part 1.
The solar heat utilization blind according to claim 2, which is selected so that it is reflected by the upper surface of the slat 2 and passes through the front edge A' of the slat 2 adjacent above. 4. High-altitude solar heat rays 60Y that have entered the second inclined portion 1b through the front edge A' of the slat 2 adjacent above
The second scope of claims for utility model registration that is orthogonal to
Solar heat blinds as described in section. 5. Utility model registration claim 2, in which the position of the lowermost edge D of the sub-slope section 2C is formed so as to directly receive all the reflected light from the upper surface of the first slope section 1a that receives solar heat rays 10Y at low altitude. Solar heat blinds as described in section. 6. The solar heat utilization blind according to claim 2 of the utility model registration claim, wherein the slats are calculated by the following formula. ? +=(90o-θx) =-
--- filαz=-90'-θX
・・・・・・ (2) α3=on + 2
αl+90° -----・(.3)
6t=d/(-α1+髇θX) −
------ (alz = (lx /co!1θ
x-tan(θn+α2)}Fish αz -- (5)
l3= [2. d (lltxtctl+lztan(
2αl〇n)+(4 +Jz)1n))(2α!+θ
n)=1=(2αl+θn) ・−・−(
6) However, the highest solar altitude is θX, and the lowest solar altitude is θ. , the slat spacing is d, and the inclination angles and projection lengths of the Ⅰth slope part, second slope part, and sub slope part are α1, α2, α3, and l, respectively.
D, l2, l3.