Where CD refers to the daylighting coefficient of the skylight opening, which can be taken according to the standard;
Kτ- total transmittance of top lighting;
K ρ-incremental coefficient of indoor reflected light for top lighting;
Kg —— Correction coefficient of height-span ratio.
Note: The sunny day direction coefficient (Kf) should be considered in the light climate areas of Class I, II and III (excluding the area south of the Tropic of Cancer).
Extended data
Relevant regulations
The Code for Residential Design (GB 50096-20 11), which came into effect on August1,2065438, stipulated the lighting of residential buildings. Excerpts are as follows:
7. 1.3 Bedroom, living room (hall) and kitchen should have natural lighting.
7. 1.4 The lighting coefficient of bedroom, living room (hall) and kitchen should not be less than1%; When the lighting window is set in the residential stairwell, the lighting coefficient should not be less than 0.5%.
7. 1.5 The window-to-floor ratio of lighting window openings in bedrooms, living rooms (halls) and kitchens should not be lower than 1/7. ?
According to the Code for Residential Buildings (GB50368-2005),
3. 1.8 The residence shall meet the requirements of ventilation, sunshine, natural lighting and sound insulation required by human health.
4. 1. 1 Residential spacing should be determined on the basis of meeting the sunshine requirements, taking into account the requirements of lighting, ventilation, fire protection, disaster prevention, pipeline laying and visual hygiene.
5.4. 1 The bedroom, living room (hall) and kitchen of the house should not be arranged in the basement. When arranged in a semi-basement, lighting, ventilation, sunshine, moisture-proof, drainage and safety protection measures must be taken.