F-17 Cooling Load Reduction by Natural Ventilation of Cavity in Factory Roofl : Part 2 Floor Temperature Change by Radiation Reduction from Ceiling

Abstract

Cooling load reduction of cavity roof of a factory was numerically discussed. Natural ventilation of the cavity was calculated as a simultaneous balance of mass and heat transfer. The variation of floor temperature irradiated from the ceiling was calculated as a three dimensional transient heat transfer in the ground. The floor temperature of a single layer roof factory arose several degrees C during a summer, but its degree was reduced with a ventilated cavity roof. The operative temperature in a large factory was able to be reduced by about 8℃ by effective cavity ventilation in a summer.