JP2001060407A - Daylight utilizing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a daylight utilizing system capable of using daylight as indirect illumination light toward a ceiling together with light reflected from a light shelf without shutting off direct daylight from an upper window. SOLUTION: A daylight utilizing system 61 is provided with a light shelf 29 which is substantially horizontally fixed over the opening direction of the window 21 at the intermediate position in the height direction of the window 21 and takes sunlight reflected at an upper surface 29a from the window 21 so as to irradiate a ceiling 33 of a room 31 with the sunlight as indirect illumination light outside of a window 21 of a building, and a prism face member 51 which is disposed over the entire upper window A above the light shelf 29 so as to reflect daylight at an incident angle of the daylight in summer while to transmit part of the daylight toward the room 31 at the incident angle of the daylight in seasons other than summer and refract it toward the ceiling in the room 31 so as to introduce the light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual environment and an air-conditioning environment which are provided in an opening (particularly, a window) of a building, and actively utilize sunlight coming from the opening into a room. A daylight utilization system that improves

[0002]

2. Description of the Related Art A light shelf is one of the reflective indirect lighting means for reflecting sunlight and taking it into a room. FIG.
As shown in this figure, this light shelf 1 is
It is mounted horizontally on the outside of the room, takes in sunlight reflected on the upper surface 1a from the window 3, and irradiates the ceiling surface 7 of the room 5 as indirect illumination light. If such a light shelf 1 is used, sunlight can be effectively used as lighting,
The power load of indoor lighting can be reduced.

[0003] However, the light shelf 1 has an upper surface 1a.
In order to reflect the sunlight reflected at the ceiling 3 of the room 5 as indirect illumination light, the sunlight must be provided at an intermediate position in the height direction of the window 3. Therefore, direct sunlight enters the room 5 from the upper window A above the light shelf 1. For this reason, conventionally, for example, a blind 11 having a plurality of horizontal slats 9 is attached to the window portion 3 to block the incidence of sunlight from the upper window portion A to reduce the cooling load and to reduce direct sunlight. The visual environment was prevented from lowering due to the incidence.

[0004]

However, when a conventional light shelf and a blind are used in combination, it is possible to prevent direct sunlight from entering, but it is necessary to effectively use the direct sunlight coming into the room from the upper window. could not. Also, since the blinds are adjusted to the same angle for the entire slat, if the slats are adjusted at an inclination angle that prevents direct sunlight from entering through the upper window, the reflected light reflected by the light shelf is blocked by the blinds. ,
In some cases, it could not be used sufficiently as indirect lighting for ceilings. The present invention has been made in view of the above circumstances, and a daylight utilization system that can be used as indirect illumination light to a ceiling surface together with light reflected from a light shelf without blocking direct sunlight from an upper window. The purpose is to provide.

[0005]

According to the first aspect of the present invention, there is provided a daylight utilization system according to the present invention, which is provided outside a window of a building at an intermediate position in a height direction of the window. A light shelf that is mounted substantially horizontally over the frontage direction of the window portion, takes in sunlight reflected on the upper surface from the window portion, and irradiates the ceiling surface of the room as indirect illumination light, and an upper window above the light shelf At the incident angle of daylight in summer, the daylight is reflected on the entire surface, while at the incident angle of daylight in the middle and winter seasons, part of the daylight is transmitted to the indoor side and the ceiling direction in the room And a prism surface material that refracts light and guides the light.

In this daylight utilization system, sunlight coming from the lower window illuminates the upper surface of the light shelf to block entry into the room, and at the same time, sunlight reflected on the upper surface is exposed to the ceiling surface. It can be used as indirect illumination light to the lighting. And, since the prism surface material is provided on the entire upper window portion, while daylight in summer is reflected, part of daylight in the middle and winter is transmitted to the indoor side and refracted toward the ceiling surface, In the upper window portion, only the daylight in summer, which particularly deteriorates the visual environment and the air-conditioning environment, is blocked, and daylight in other seasons can be effectively used.

A daylight utilization system according to a second aspect of the present invention includes a plurality of horizontal slats provided in a lower window below the light shelf and arranged vertically at intervals. It is characterized by having a blind capable of changing the angle.

[0008] In this daylight utilization system, the blind is provided in the lower window, so that the sunlight that is going to enter from the lower window without being blocked by the light shelf during the time when the incident angle of the sunlight is small. Blocking is possible, and a decrease in the visual environment due to the incidence of direct sunlight at the window is prevented.

According to a third aspect of the present invention, in the daylight utilization system, the light shelf has a light-transmitting property for transmitting a part of sunlight radiated to the upper surface to the lower surface.

[0010] In this daylight utilization system, since the light shelf has translucency, part of the sunlight radiated to the upper surface is transmitted to the lower surface, and the lower surface of the light shelf is brightened to some extent. When viewed from the outside, discomfort due to darkening of the lower surface of the light shelf and deterioration of the visual environment are eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a daylight utilization system according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram schematically showing a daylight utilization system according to the present invention, FIG. 2 is a side view showing an example of a light translucent light shelf, and FIG. 3 shows a situation of obtaining and removing solar heat from a prism face material. FIG. 4 is an explanatory diagram showing the reflection and transmission of sunlight in each season of the prism face material.

A pair of left and right columns 23 is fixedly provided on the window 21 of the building with the window 21 interposed therebetween. Each pillar 2
A horizontal bracket 27 protruding from the outer wall 25 is provided at an intermediate portion in the vertical direction of 3. The right and left brackets 27 support a rectangular plate-like light shelf 29 that is long in the frontage direction of the window 21. Light shelf 29
Are arranged at substantially the center of the window 21 in the vertical direction. The window 21 in which the light shelf 29 is disposed at the center has an upper window A on the upper side and a lower window B on the lower side with the light shelf 29 interposed therebetween.

The light shelf 29 takes in sunlight reflected on the upper surface 29a from the window 21 and irradiates the ceiling surface 33 of the room 31 as indirect illumination light. Therefore, sunlight can be effectively used as lighting, and the power load of indoor lighting can be reduced.

The upper surface 29a of the light shelf 29 is surface-treated so as to reflect daylight efficiently. Specific examples include application of a paint for increasing the reflectance, plating treatment, and formation of a mirror-like coating.

The light shelf 29 may be translucent or non-translucent. According to the light shelf 29 having non-light-transmitting properties, high reflection efficiency can be obtained. On the other hand, a translucent light shelf 2
According to 9, the lower surface of the light shelf 29 can be brightened. As the translucent light shelf 29, for example, as shown in FIG.
Are arranged in parallel with a slit 37 interposed therebetween. With such a structure, it is possible to provide a light-transmitting property while securing the reflection area of the upper surface 29a.
As a result, the lower surface of the light shelf 29 is brightened to some extent, and when the exterior is viewed from the indoor side, the discomfort due to the lower surface of the light shelf 29 becoming dark and the visual environment are not reduced.

On the indoor side of the lower window B, a blind 41 for blocking direct sunlight is attached. Blinds 41
Has a plurality of horizontal slats 43 that are vertically spaced apart. The slat 43 is supported by a rail-shaped housing 47 provided at an intermediate position of the window via a support cord (not shown). The rail-shaped housing 47 has a slat 43
Slat lifting mechanism (not shown) for lifting and lowering the slats 4
A slat angle changing mechanism (not shown) for changing the inclination angle of the camera 3 is built in. The slat 43 is configured such that the slat lifting and lowering mechanism and the angle changing mechanism adjust the vertical movement and the angle.

Incidentally, a prism face material 51 is provided on the entire surface of the upper window portion A. Either the prism face material 51 is attached to the upper window portion A so as to overlap with the existing glass window, or the prism face material 51 itself has a function of a glass window and only the prism face material 51 is provided alone. It may be. In this embodiment,
The case where only the prism face material 51 is provided alone in the upper window portion A will be described as an example.

As shown in FIG. 3, the prism face material 51 is
An air layer 5 is provided between two parallel transparent glass plates 53,53.
5 are formed. In the air layer 55, a plurality of prisms 57 for controlling transmission and reflection of sunlight irradiated from the outside are vertically arranged. The prism face material 51 controls transmission and reflection of sunlight according to an incident angle θ of sunlight radiated from the outside. Further, the prism face material 51 has an action of refracting the transmitted sunlight toward the ceiling surface.

Next, the operation of the daylight utilization system 61 configured as described above will be described. When the incident angle θ of the sunlight with respect to the window portion 21 increases, the sunlight to be incident from the lower window portion B irradiates the upper surface 29a of the light shelf 29, and the entry into the room 31 is blocked.
The sunlight reflected by a can be used as indirect illumination light for the ceiling surface 33.

At this time, since the light shelf 29 has translucency, part of the sunlight radiated on the upper surface 29a is transmitted to the lower surface, and the lower surface of the light shelf 29 is brightened to a certain extent. When viewed from the outside, the discomfort due to the lower surface of the light shelf 29 becoming dark and the deterioration of the visual environment are eliminated.

In a time zone in which the incident angle θ of the sunlight is small, the sunlight that is going to enter from outside without being blocked by the light shelf 29 can be blocked by the blind 41, and the visual environment due to the incidence of the direct sunlight at the window Is prevented from decreasing.

On the other hand, the prism face member 51 controls the transmission and reflection of sunlight according to the incident angle θ of sunlight radiated from the outside. Considering the transmission and reflection of sunlight from the viewpoint of obtaining and removing solar heat, the transmission and reflection performance of the prism face member 51 is such that the solar heat obtaining ratio q1 and the direct transmittance q2 for the solar heat Q on the indoor side. , The indoor heat radiation rate q3, the outdoor heat radiation removal rate q4, the reflectance q5, and the outdoor heat radiation rate q6. Here, for example, prism face material 5
If "ECOSS-W" manufactured by Figura Co. is used as 1, these ratios become the values shown in Table 1 in summer, middle (spring / autumn), and winter with different sun incident angles θ. The design conditions for calculating these values are as follows: the position of the window 21 = latitude 3 north
6 °, time = 12: 00, direction of window 21 = south direction.

[0023]

[Table 1]

As shown in Table 1, in a room, the sum of the direct transmittance q2 and the indoor heat radiation rate q3 is the solar heat acquisition rate q1, and in the outdoors, the sum of the reflectance q5 and the outdoor heat radiation rate q6 is the solar heat gain. The removal rate is q4. And this solar radiation heat acquisition rate q1
The sum of the solar heat removal rate q4 and the solar heat removal rate q4 is solar heat Q (that is, solar energy 100%).

Thus, depending on the incident angle θ of sunlight,
By using the prism surface material 51 for controlling the transmission and reflection of sunlight, the upper window A reflects daylight at the incident angle θ of daylight in summer shown in FIG.
At the incident angle θ of daylight in the intermediate period shown in FIG. 4B and the winter period shown in FIG. 4C, a part of the daylight is transmitted to the room 31 side and refracted to the ceiling surface 33 to guide the light. Becomes possible. As a result, in the upper window portion A, only the daylight in summer, which particularly deteriorates the visual environment and the air-conditioning environment, is blocked, and the daylight in other seasons can be effectively used.

[0026]

As described in detail above, in the daylight utilization system according to the first aspect of the present invention, since the light shelf is provided at an intermediate position between the windows, the solar light coming from the lower window can be used. Light can be reflected to the ceiling surface by the light shelf to prevent direct sunlight from entering the window to improve the viewing environment, and the blocked sunlight can be effectively used as indirect illumination light on the ceiling surface. it can. And since the prism face material was provided on the entire upper window,
In the upper window, only the daylight in summer, which degrades the visual environment and the air-conditioning environment, is cut off, and the daylight in other seasons can be refracted toward the ceiling and used effectively together with the light reflected from the light shelf.

In the daylight utilization system according to the second aspect of the present invention, since the blind is provided in the lower window below the light shelf, the light will enter from the lower window without being blocked by the light shelf during a time when the solar altitude is low. Can be blocked, and the viewing environment at the window can be improved.

In the daylight utilization system according to a third aspect of the present invention, the light shelf has a light-transmitting property for transmitting a part of sunlight radiated to the upper surface to the lower surface, so that the lower surface of the light shelf can be brightened. In addition, it is possible to eliminate a sense of incongruity and a decrease in the viewing environment due to the darkened lower surface of the light shelf when the outside is viewed from the indoor side.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically illustrating a daylight utilization system according to the present invention.

FIG. 2 is a side view showing an example of a light shelf having a light-transmitting property.

FIG. 3 is an explanatory view showing the status of obtaining and removing solar heat from a prism face material.

FIG. 4 is an explanatory diagram showing the reflection and transmission of sunlight in each season of a prism face material.

FIG. 5 is a configuration diagram schematically showing a conventional daylight utilization system.

[Explanation of symbols]

Reference numeral 21: window, 21a: upper surface, 29: light shelf, 3
DESCRIPTION OF SYMBOLS 1 ... Indoor, 33 ... Ceiling surface, 41 ... Blind, 43 ... Slat, 51 ... Prism surface material, 61 ... Daylight utilization system, A ... Upper window part, B ... Lower window part

Claims (3)

[Claims] 1. At the outside of a window of a building, at a middle position in the height direction of the window, substantially horizontally attached to the frontage of the window and reflected by the upper surface, sunlight is taken in from the window. A light shelf that illuminates the ceiling surface of the room as indirect illumination light, and is provided on the entire upper window portion above the light shelf to reflect the daylight at the incident angle of daylight in summer, and in the middle and winter A daylight utilization system, comprising: a prism surface material that transmits a part of the daylight toward the indoor side and refracts the light toward the ceiling surface in the room to guide the light at the incident angle of the daylight. 2. A blind having a plurality of horizontal slats provided in a lower window portion below the light shelf and arranged vertically at a distance from each other and capable of moving up and down and changing the angle of the slats. The daylight utilization system according to claim 1, wherein: 3. The daylight utilization system according to claim 1, wherein the light shelf has a light-transmitting property to transmit a part of sunlight radiated to the upper surface to a lower surface.