保温率 Heat Loss reduction

The ratio of the difference in heat loss through the glass after installing film to the heat loss through    the glass with on film. It is expressed as a percentage and is determined by the respective "U" values    of the glass with and without film.    使用薄膜之后进入窗户的太阳能数量与之前的比值。用百分数来表达，它由使用薄膜前后的两个U值决定的。