Industrial Warehouse Lighting Design
The industrial warehouse lighting design of the factory mainly selects the lighting source and the luminaire according to the production requirements and illuminance standards, determines the lighting scheme, and calculates the illuminance. The general illuminance is calculated by the coefficient method.
Example: An industrial and electrical industrial plant, steel structure, the fire risk of production is D. The length of the plant is 270m, the width is 72m, the longitudinal column spacing is 8m, the lateral column spacing is 9m, and the truss height of the truss is 12. 7m. The reflection ratio of the ceiling in the workshop is ρc = 50%, the reflection ratio of the wall is ρw = 30%, and the reflection ratio of the floor is ρf = 20%. Please design the lighting.
1) Light source selection
According to the requirements of the process for industrial warehouse lighting, and according to the “GB 50034 -2004 Architectural Lighting Design Standards”, Section 5.3.1, Table 5. 3. 1. 2, the factory is a general welding and forging factory room, the general illumination of the factory is set to 200lx. The height of the top of the vehicle is 11.4m. Considering that the installation height of the lamp is set to 12m and the installation height is above 10m, the color rendering index of the plant lighting is required to be Ra = 20 ~ 60, and the 400W metal halide lamp is selected.
2) Calculation room space ratio RCR
3) Determine the utilization factor and maintenance factor of the warehouse lighting
Check the “Lighting Design Manual” (Second Edition) Table 4 – 43 Determine u =0. 76, according to the “Architectural Lighting Design Standards” 4.6.1 Table 4. 4. 6, K = 0.7.
4) Calculate the number of lamps, determine the average illumination of the warehouse lighting scheme to take 200lx, and calculate the number of lamps
According to the structure of the plant, the lamps are installed along the transverse beam of 9m column length, a total of 29 roads, longitudinally divided into 3 spans, each span of 24m, so (3 × 29) × 3 = 261 lamps are selected.
5) Verify the maximum allowable height to height ratio
The longitudinal direction is 8/11.25 = 0. 71; the lateral direction is 9 / 11. 25 = 0. 8, according to the “Lighting Design Manual” (Second Edition) Table 4 – 43, this value meets the maximum allowable height-to-height ratio requirements of the luminaire, so The illumination uniformity meets the requirements.
6) Calculate the actual illuminance value
7) Check of LPD value
Actual power density LPD = 261 × ( 400 + 32 ) / ( 270 × 72) = 5. 8 (W / m2 ) , according to “GB 50034 – 2004 Architectural lighting design standards” Article 6.1.7 Industrial building lighting power Density value, the current power density value is 8W/m2, and the target power density value is 7W/m2. Therefore, the energy-saving LPD indicator is met.
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