The most energy-efficient way of lighting design: make full use of natural light

Natural light is the most common light source in people's production and life, and human vision has higher sensitivity than natural light in natural light. Therefore, it is necessary to correctly choose the form of lighting, to determine the necessary lighting area and suitable location, in order to form a good lighting environment.

In the design of buildings, industrial buildings lighting area (industrial enterprises should comply with the relevant provisions of the lighting design standard ", according to the construction requirements, the civil construction of the minimum lighting area ratio should generally not be less than the values listed in table 9-10.

Lighting area ratio

Visual grading work

Average value of daylight factor (%)

Window area ratio

For example places

I

>4

1/4

Drawing room, exhibition

II

3-4

1/5

Reading room, operation room, laboratory of education, etc.

III

2-3

1/6

Office, conference room, shops etc.

IV

1-2

1/7

Residential rooms, kitchen etc.

V

<1

1/10

Side storage room, corridor section

In the design of building lighting, lighting the way should be new efficiency, good performance, such as flat roof, horizontal skylight, make full use of natural light, shorten the time of electric lighting, electric energy is saved, and create a comfortable lighting environment for health. Figure 9-15 shows the illumination level and from the window the distance between the. It can be seen that the illumination level decreases with the increase of distance.

The relationship between the indoor illumination and the distance from the window

1 natural light 2 total illumination 3 artificial lighting

In addition, the production workshop to keep the glass clean, but also can shorten the time of day electrical lighting.

Indoor wall, ceiling, floor, the use of light color decoration, can improve the indoor reflection coefficient. Such as white wall reflection coefficient of 70% a 80%, can effectively improve the utilization of light.

The use of lighting fixtures is to obtain the desired level of illumination. Therefore, the level of illumination required for lighting consumes less energy to save electricity.

The lighting utilization coefficient is the ratio of the luminous flux obtained from the working face and the luminous flux emitted by the lamp, and the illumination compensation coefficient is the ratio of the illuminance obtained from the working face to the initial illuminance of the lamp after a certain period of time. Due to the aging of the process or the use of the device attached to the dust and other reasons, the intensity of the light will gradually decline in the light of the most exposed to the surface of any object is called the intensity of illumination. That is, the average luminous flux of LLNL is distributed on the area of 1 mZ. In order to consume the least amount of electric energy to emit more luminous flux, the luminous efficiency (Im/W) should be used as much as possible.

In order to get a higher luminous efficiency, the relationship between the reflection coefficient of the surface of the work surface and the brightness and illumination must be considered. Brightness is determined by the ratio of the reflection of the luminous surface of the visual orientation and the size of the visible part of the light emitting surface.