隔热率(热量降低率) Heat gain Reduction

The ratio of the difference in total solar energy before and after installing film on the glass to   that entering through the glass with on film. It is expressed as a percentage and is determined by   the respective shading coefficients of the glass with and without film.   使用薄膜之前透过窗户的太阳能数量与使用后的之比。它用百分比来表达。它由无薄膜和有薄膜后的荫蔽系数决定的。