日照作用对热源建筑自然通风影响的研究

参照变电站主变压器室，建立了双侧开口热源建筑数值模型，通过改变大气透过率（sunshine fraction）的大小改变日照强度，利用FL U EN T进行求解，考察日照作用对热源建筑自然通风流动的影响。计算结果表明：日照作用影响热源建筑室内外热量传递的大小和方向，当大气透过率为0．15时，室内外两侧传递热量达到平衡。较大的日照强度导致通风量增大，室内气流速度分布更均匀，日照作用下不同高度的气流温度受到的主要影响因素不同。

Effect of solar radiation on natural ventilation performance in heated buildings

Referring to the main room of a transformer station, a numerical model of a bilateral opening heat building was established. The sunlight intensity was vaired by changing the atmospheric transmittance (Sunshine Fraction) and the Fluent solver was utilized. The effects of solar radiation on the vent temperature, the net heat flow between the indoor and outdoor space, ventilation rate, and velocity and temperature distribution were investigated. The results show that solar radiation has a significant impact on the magnitude and direction of the net heat flow between the indoor and outdoor environment. When the atmospheric transmittance is 0.15, the net heat equilibrium comes to zero. Larger sunshine intensity results in increased ventilation rate and more uniform air velocity distribution. The vertical air temperature distribution varies because of different main impact factors under sunshine conditions.