透明盖板与外界空气间的对流换热系数,盖板热阻之比,吸热板与盖板间自然对流因子,计算太阳能集热器的出口温度和瞬时效率-Convective heat transfer coefficient between the outside air and the transparent cover, the cover ratio of the thermal resistance between the absorber plate and cover natural convection factor to calculate the solar collector outlet temperature and the instantaneous efficiency