Influence of Building Distance on the Net Radiation Heat Gain of Buildings in Guangzhou and Sendai

摘要

1) The shortwave radiation heat gain mainly depends on the exposure level of the surfaces to the sunshine. The longwave radiation heat emission mainly depends on the amount of the shortwave radiation absorbed by the surfaces. 2) The ratio of the roof surface area to the whole building surface area is relatively small and therefore it is necessary to examine the reduction potential of cooling load by considering both the intensity of radiation gain and the area of the corresponding surface. 3) The vertical surfaces receive less shortwave radiation gain in comparison with the horizontal surfaces. But improvement made on the vertical surfaces can be effective during specific time period, such as the east surface on the morning. 4) With regard to the vertical surfaces, the east and west surfaces receive more shortwave radiation per square meter than the north and south surfaces when building distance in the north-south direction is short. However as the building distance gets larger, the differences of heat gain values among these surfaces are not so obvious. This proves the reduction effect of the building distance to its cooling load, and the potential of reduction of cooling load can be also expected on building's east and west surfaces.