Suitability of Inlet Wind Speed for Tunnel Wind System

By setting up the tunnel inner wall heat transfer coefficient and heat transferring quantity of the theoretical model, the influence of inlet wind speed, tunnel diameter and soil types are analyzed. Furthermore, the variation of indoor temperature basing on different inlet wind speed is studied. The results show that the inlet wind speed has the maximum impact on system performance, and the indoor temperature gets higher with the accelerating of inlet wind speed. When the speed is 1 m/s, the temperature is the lowest. When the speed is less than 2 m/s, the range of air flow speed at 1.5 m of the tunnel is 0.31 to 0.37 m/s, the consequence conforms to the requirement of body thermal comfort. Therefore, if the requirements of indoor thermal environment are loose, to meet the requirement of thermal comfort, the speed of inlet wind should be controlled between 1 and 2 m/s and the heat pressure of solar chimney must be enough for providing power at the same time.