Fire emergency lighting illumination requirements
Fire emergency lighting illuminance requirements_Emergency lighting illuminance calculation
Fire emergency lighting luminaires illuminance requirements:
① Evacuation aisles of the ground should not be less than 0.5 lx minimum level of illumination;
② the minimum level of illumination of the ground in crowded places should not be less than 1.0 lx;
③ The minimum level of illumination of the floor in the stairwell shall not be less than 5.0 lx;
④ fire evacuation lighting installed in the evacuation aisles, stairwells, smoke-proof front room, public places and other parts of the fire evacuation works, the minimum illumination value should not be less than 5.0 lx
⑤ Fire emergency lighting in fire control room, fire pump room, self-generator room, power distribution room, smoke and smoke exhaust room and other rooms that still need to work normally in case of fire shall still ensure the illuminance of normal lighting.
Average illuminance calculation formula:
Utilization factor method: Eav = φ (individual luminous flux) * N (number) * CU (space utilization factor) * MK (maintenance factor) / S (area)
The space utilization factor is generally taken as 0.3~0.4, and the maintenance factor is generally taken as 0.7~0.8;
Unit capacity method: W (unit illuminated area required power) = P (all lamps power) / S (illuminated area)
Conversion: N (number of lamps) = E (required illuminance) * A (room area) * φ0 (unit area per LX luminous flux) * C1 (correction coefficient) * C2 (correction coefficient) / φ (individual lamp luminous flux)
Point by point calculation method: more complex, not listed.
General study illuminance is 100Lux, but the lighting illuminance required for reading is 600Lux, so it is best to use desk lamps as local lighting.
Indoor just discern the outline of the human face, illuminance for 20LX, playing chess and cards illuminance for 150LX, reading a novel about 250LX, that is, 25 watts of incandescent lamps away from the book 30-50 centimeters, writing about 500LX, that is, 40 watts of incandescent lamps away from the book 30-50 centimeters, watching TV about 30LX, with a 3-watt lamp outside the line of sight on the line.
Maintain the appropriate illumination, to improve the efficiency of work and study have great benefits; in too strong or too dark light irradiation work and study, the eyes are harmful.
The size of illumination utilized by the same lamp
1). Related to the type of lamps, light efficiency and light distribution curve.
2). With the lamp hanging height. The higher the suspension, the more reflected light flux, the higher the utilization factor.
3). Related to the area and shape of the room. The larger the area of the room, and the closer it is to a square, the higher the utilization factor will be due to the increase in direct light flux.
4). It is related to the color and cleanliness of the walls, ceilings and floors. The lighter the color and the cleaner the surface, the more light flux is reflected and therefore the higher the utilization factor.
