JP2002270015A - Lighting system effectively utilizing natural light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system easily applicable to an existing building without large-scale renovation, and capable of saving energy by effectively utilizing natural light. SOLUTION: A slat angle automatic adjustment type blind 2 is installed by mounting a blind box 2a at an intermediate part of a window. A light diffusion film 4 is stuck to a window surface 1a above the blind box 2a, and thereby the diffused light is introduced from the upper side even in closing the blind while moderating the direct sunlight. By installing a light modulation system in each luminaire 3, local light modulation is so carried out to stabilize the brightness of a floor surface and the surface of a desk irradiated by the luminaire group. By implementing the renovation like this, this lighting system effectively utilizing the natural light can be composed in an existing office without spending much expense for the renovation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting system that effectively utilizes natural light, and more particularly to an effective use of natural light in an office space within an office without renovating an existing building on a large scale. Lighting system that can be used.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for energy saving, and the use of natural light in office spaces such as office buildings has become an indispensable factor.
For this reason, light shelves, 2
Architectural techniques such as surface lighting have been designed to capture natural light. In addition, various types of light duct devices and the like for introducing natural light into a room and illuminating the room using a light duct have been proposed. Also, in order to efficiently use natural light, it has been proposed to install a blind having an automatic slat angle adjustment mechanism in a window of a building (for example, Japanese Patent Application Laid-Open Nos. 4-44589 and 6-1).
68786, etc.). In the above publication, the slat angle of the blind is adjusted based on the altitude angle and the azimuth angle of the sun, so that the sunlight incident from the window is optimized.

[0003]

SUMMARY OF THE INVENTION In a new building,
Although it is possible to adopt the above-mentioned construction method using natural light and introduce light duct devices, significant renovation is required to apply it to existing buildings, and large costs are required for renovation. I need. If natural light can be effectively used in existing buildings, it will be possible to greatly save energy throughout the city. Conventional technologies that can be easily applied to existing buildings using natural light include, for example, installation of blinds having the above-described automatic slat angle adjustment function. It was not satisfactory in terms of effective use of natural light. The present invention has been made in consideration of the above circumstances, and can be easily applied to an existing building without performing a large-scale renovation, and can save energy by effectively using natural light. It is intended to provide a lighting system.

[0004]

[Means for Solving the Problems] When natural light is introduced into an office space such as an office building, it is necessary to prevent direct sunlight from the sun and to diffuse light without glare into the room so that it reaches the interior of the room. Moreover, it is necessary to keep the brightness of the room constant. Further, as described above, it is desirable to configure a lighting system that effectively uses natural light without incurring much cost for repair. In the present invention, a lighting system satisfying the above conditions is realized as follows. A blind box for accommodating the blinds is attached at a predetermined distance from the upper end of the window, and a light diffusion film is attached to a window above the blind box. And a brightness sensor for measuring the brightness of the combined light of natural light and artificial light incident from the window, a direct sunlight sensor for measuring sunlight, dimming means for adjusting the illuminance of a luminaire installed indoors, and a window. And a blind control means for controlling the raising and lowering of the blind attached to the vehicle and adjusting the slat angle of the blind. And, by the dimming unit, the illuminance of the lighting fixture is adjusted according to the output of the luminance sensor to control the brightness of each part in the room to be constant, and by the blind control unit, Based on the output of the solar direct sensor and the sun altitude according to pre-programmed solar orbit data, the direct sunlight does not enter the room and the amount of light incident from the window is optimized, and the blind slats are raised and lowered. Adjust the corner. As described above, the light diffusion film is attached to the upper part of the window, and the diffused light is introduced into the room by lighting from a position as high as possible in the window, whereby natural light can reach the interior of the room. Further, since light from above has little glare, even if natural light is taken in, glare is rarely felt. Furthermore, even when the blinds are completely closed, natural light can be taken into the room, and the room can be illuminated without relying only on artificial lighting. In addition, a light diffusion film can be attached to a part of the window, a blind equipped with a slat angle automatic adjustment mechanism can be installed, and dimming means can be simply provided. Can be easily applied to offices.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining a method for repairing an existing office according to an embodiment of the present invention. FIG. 1 (a) shows a state before repair, and FIG. 1 (b) shows a condition after repair. The state is shown. As shown in FIG. 1A, before the renovation, a blind 2 is provided in a transparent glass window 1 and a blind box 2a is provided.
Is mounted on a ceiling surface, and a lighting device 3 capable of only performing blinking is mounted on the ceiling surface. The following offices will be renovated in the office of the above office. (1) Blind replacement Remove the blind box 2a attached to the ceiling surface, and as shown in FIG.
(About 00), a blind box 2a is attached, and a blind 2 of an automatic slat angle adjustment type is provided. (2) Pasting of a diffusion film A light diffusion film 4 is pasted on the window surface 1a on the upper part of the blind box 2a (preferably 40 cm to 80 cm from the upper end of the window).
cm) and absorbs diffused light from above even when the blinds are closed, while softening direct sunlight. (3) Adoption of automatic dimming system A dimming system is provided in the lighting fixture 3, and artificial lighting is completely local dimming. In other words, using about 4 to 12 lighting fixture groups as a unit for dimming control, the automatic dimming controller controls the lighting of the floor and desk illuminated by each lighting fixture group to be constant. It should be noted that if the unit of dimming is further increased, the illuminance difference in the room increases, so that the unit of dimming is desirably as small as possible.

The following effects can be obtained by performing the above modification. (A) Because it takes in diffused light from a high position at the top of the window,
It can reduce glare and allow natural light to reach deep inside the room. Furthermore, since the brightness around the opening is increased, the brightness contrast with the window surface can be reduced. (B) By installing the blind 2 provided with the automatic slat angle adjustment mechanism, the amount of light incident through the blind 2 can be increased while avoiding unpleasant direct sunlight. (C) Since the lighting apparatus 3 is provided with the automatic light control system, ideal lighting control can be performed without relying on a person. In particular, by using local dimming, it is possible to keep the brightness in the interior of the room where natural light does not easily reach and the brightness near the windows almost constant, and to obtain a comfortable work environment.

FIG. 2 is a diagram showing a configuration example of the automatic light control system and the blind control system shown in FIG.
In the figure, 1 is a transparent window, 2 is a blind, 2a is a blind box, and the light diffusion film 4 is attached to the window 1a on the top of the brand box 2a as described above. The blind controller 11
The blind 2 is raised and lowered and the slat angle is adjusted based on the output of the solar direct sensor 11a for detecting sunlight and the solar altitude based on pre-programmed solar orbit data. Luminance sensors 22-1 to 22-1 attached to a ceiling surface or the like
22-n measures the luminance of the floor and the desk surface by the combined light of natural light and artificial light. The automatic dimming controller 21 controls the lighting fixture groups 3-1 to 3-1 so that the brightness of the floor and the desk surface is constant based on the brightness of the floor and the desk surface measured by the brightness sensors 22-1 to 22-n. 3-n is feedback-controlled.

The dimming control by the automatic dimming controller 21 is local dimming in which dimming control is performed in units of about 4 to 12 lighting fixtures as described above. That is, the brightness of the lighting fixture group 3-1 is controlled based on the output of the brightness sensor 22-1, the brightness of the lighting fixture group 21-2 is controlled based on the output of the brightness sensor 22-2, and so on. Sensor 22
Each of the lighting fixture groups 3-1 to 3-3 based on the outputs of -1 to 22-n
-N is controlled. Since natural light entering through a window is attenuated as it goes deeper into the room, it is necessary to increase the brightness of artificial lighting as it goes deeper into the room. The dimming control is local control as described above, and the brightness of each of the lighting fixture groups 3-1 to 3-n is determined according to the brightness of the floor and the desk surface measured by each of the brightness sensors 22-1 to 22-n. By controlling the brightness, the brightness at the window and at the back of the room can be controlled to be substantially constant. As the automatic light control controller 21, for example, the outputs of the luminance sensors 22-1 to 22-n are compared with predetermined set values, and each of the lighting fixture groups 3-1 to 3-
A well-known automatic dimming controller that feedback controls the brightness of n can be used.

FIG. 3 is a diagram showing an example of the configuration of the blind controller 11. FIG. 3 shows an example of the configuration of a system for controlling the opening and closing of the blind 2 and the slat angle using an arithmetic unit such as a CPU. In the figure, the direct sunlight sensor 11a determines whether or not there is direct sunlight (clear weather,
Cloudy weather) is detected. The solar direct sensor 11a
It can be installed at an appropriate position where direct sunlight can be detected. The output of the solar direct sensor 11a is input to the arithmetic unit 11c via the input interface 11b. The orbit data of the sun in each season and each time zone is stored in advance in the storage device 11d, and the arithmetic device 11c outputs the output of the solar direct sensor 11a, the sun orbit data stored in the storage device 11d, and Based on the date and time data of the internal clock of the arithmetic unit 11c, whether to raise or lower the blind 2 is determined, and the slat angle of the blind when the blind 2 is lowered is obtained. Then, control signals are sent to the blind raising / lowering control mechanism 11f and the slat angle control mechanism 11g via the output interface 11e to control the raising / lowering of the blind and the slat angle as follows.

(A) Daytime The arithmetic unit 11c determines whether or not there is direct sunlight based on the output of the direct sunlight sensor 11a. When there is no direct sunlight (during cloudy weather), the blind 2 is raised and direct sunlight is applied. When there is (clear weather), lower the blind 2. And
When the blind 2 is lowered, the slat angle at which the amount of direct light does not enter the room and the amount of light incident from the window through the blind is optimized from the solar altitude in each time zone stored in the storage device 11d. Then, the slat angle of the blind 2 is controlled. For example, when the sun altitude is high, the slat angle of the blind 2 is reduced as shown in FIG. 4A, and when the sun altitude is low, the slat angle is increased as shown in FIG. 4B. Further, when the sunlight temporarily becomes weak, the slat angle is opened as shown in FIG. (b) Nighttime The arithmetic unit 11c determines whether it is daytime or nighttime based on the internal clock. At nighttime, the blind 2 is lowered and the blind 2 is closed frontward as shown in FIG. 4D.

When the office office was renovated by the method described in the above embodiment, a simulation was performed under the following conditions, and a comparison was made before and after the renovation. (i) Test period The calculation was performed every hour from 9:00 to 17:00 for each day from January to December (22 days of each month). (ii) Weather The weather luminance distribution based on the average cloud amount (according to weather data) at each date and time for each month was used. (iii) Blind control When the solar radiation intrudes 0.2m or more from the window surface, it is completely closed. (iv) Simulation space Assuming existing facilities, the ceiling height is 2.6 m, and the depth of the room is 1
2.8m, South facing opening, window sill height 0.75m ・ Before renovation Opening height 0.75m ~ 2.6m (all transparent glass) Blinds to ceiling (height 2.6m) ・ After renovation Opening 0.75m to 2.1m (transparent glass) 2.2m to 2.6m (diffusion film attached) Blind mounting at 2.1m height

[0012] As a result of the simulation, when the renovation described in this embodiment is performed, in a facility without an eaves, when the set illuminance in the room is 500 lux, the annual daylight efficiency is 23% after the renovation. (Setting illuminance is 7
15% for 50 looks, 33 for 300 looks
%). On the other hand, before the renovation (the lighting is not blinking control and no blind control), the daylight effective rate is 0%, and according to the method of the present invention, the lighting power is reduced from 9:00 to 17:00. The rate was about 30%, and it was confirmed that a remarkable effect was obtained in using natural light.

[0013]

As described above, the following effects can be obtained in the present invention. (1) Since the introduction of natural light through the light diffusion film pasted on the window at the top of the blind, the control of the blind, and the dimming control of the room are effectively combined, the lighting using the natural light effectively is used. A system can be constructed, and the power for indoor lighting can be significantly reduced as compared with the conventional system. In addition, it is possible to effectively use natural light without renovating an existing building on a large scale, thereby contributing to energy saving. (2) A light diffusion film is attached to the window at the top of the blind and the blinds are automatically adjusted.
A comfortable working environment without direct sunlight entering the working room and no glare can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method for repairing an existing office according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of an automatic light control system and a blind control system according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration example of a blind controller 11;

FIG. 4 is a diagram illustrating control of a slat angle by a blind controller 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Window 2 Blind 2a Blind box 3 Lighting equipment 3-1, ..., 3-n Lighting equipment group 4 Light diffusion film 11 Blind controller 11a Sun direct sensor 11c Computing device 11d Storage device 11f Blind raising / lowering control mechanism 11g Slat angle control mechanism 21 Automatic dimming controller 22-1, ..., 22-n Luminance sensor

Claims (1)

[Claims] 1. A brightness sensor for measuring the brightness of a combined light of natural light and artificial light incident from a window, a direct sunlight sensor for measuring sunlight, and a light control means for adjusting the illuminance of a lighting fixture installed indoors. And blind control means for controlling the opening and closing of the blind attached to the window and adjusting the slat angle of the blind, wherein the dimming means adjusts the illuminance of the lighting fixture by the output of the brightness sensor, Control the brightness of each part in the room to be constant, the blind control means, based on the output of the sun direct sensor and the sun altitude according to pre-programmed sun orbit data, direct light does not enter the room And an illumination system for adjusting the blind raising and lowering and the slat angle of the blind so that the amount of light incident from the window is optimized. A blind box for storing the door is mounted at a position away from the upper end of the window by a predetermined distance, and the window above the blind box is attached to a light diffusing film, thereby effectively utilizing natural light. Lighting system.