參數(shù)定義 Definition
太陽能穿透率%Total Solar Transmittance
The percent of incident solar radiation that is directly passed through glazing system.
允許穿透玻璃窗的其中波長在300-2100毫微米的太陽能數(shù)量與照在上面的太陽能總量的比率，常用百分比來表達；
或：在太陽光譜（300納米至2500納米，含紫外光、可見光和近紅外光）范圍內(nèi)，透過玻璃的太陽能強度對入射太陽能強度的百分比。
太陽能反射率%Total Solar Reflectance
The percent of incident solar radiation that is reflected by a glazing system.
由玻璃窗反射到室外的太陽能總量與落在窗上的太陽能總量之比，在有薄膜的反射是指對者窗戶外表的那面反射的能量數(shù)量，通常也可以用百分比表示；
或：在太陽光譜（300納米至2500納米，含紫外光、可見光和近紅外光）范圍內(nèi)，透過玻璃的太陽能強度對入射太陽能強度的百分比。
太陽能吸收率%Total Solar Absorption
The percent of incident solar radiation that is absorbed by glazing system.
玻璃窗吸收的太陽能數(shù)量與落在上面的總量之比。吸收的也就是除傳遞和反射的那部分，由于傳遞量和反射量可直接測得，吸收總量也就可按此等式算出：吸收總量=1。0-傳遞總量-反射總量；
可見光穿透率（透光率）%Visible Light Transmitted
The ratio of visible light transmitted through the window to that which is incident upon the window.
太陽光穿過玻璃窗的可見光的數(shù)量與投射在上面的之比。
或：在可見光譜（380納米至780納米）范圍內(nèi)，透過玻璃的光強度對入射光強度的百分比。
可見光反射率（反光率）Visible Light Reflected
The ratio of visible light that is reflected away from the surface of the window to that which is incident on the window.
玻璃窗表面反射的可見光數(shù)量與投射在上面的之比
或：在可見光譜（380納米至780納米）范圍內(nèi)，玻璃反射的光強度入射光強度的百分比。
發(fā)散率(輻射率) Emissivity
The measure of the ability of a surface to emit room temperature radiant heat energy. A low emissivity means a high reflectivity of room radiant energy.
用來表示玻璃表面散發(fā)室內(nèi)溫度輻射能的能力。反射率低說明室內(nèi)輻射能的反射量大
紫外線隔斷率UV Reduction
The ratio of the difference in ultraviolet transmission of the glass before and after installing film to the ultraviolet transmission of the glass with on film. It is expressed as a percentage and is determined by the respective UV transmission values of the glass with and without film.
使用薄膜之前的穿過窗戶的紫外線數(shù)量與使用后的比值，用百分比表達，它是由使用薄膜前后的紫外線穿透值決定的。
“U”值 “U” Value
The measure of the ability of the window to transfer heat from one side to the other due to the difference in temperature of the air and surroundings on each side of the window. A low “U” value results in a low transfer of heat through the window.
表示窗戶傳遞熱量的能力。它會因氣溫、玻璃二面環(huán)境的不同而不同，U值低，說明玻璃傳熱能力差。
或：U值（K值）是玻璃組件的傳熱系數(shù)。ASHRAE標準條件下，由于玻璃熱傳遞和室內(nèi)外的溫差，所形成的空氣到空氣的傳熱量。其英制單位為：英熱量單位每小時每平方英尺每華氏溫度。公制單位為：瓦每平方米每開氏溫度。U值越低，通過玻璃的傳熱量也越低。
遮蔽系數(shù)（SC）Shading Coefficient
The ratio of solar energy that enters through a window compared to the energy entering a clear, double strength sheet of glass; includes both energy transmitted through the window and energy absorbed in the window.
指進入一窗戶太陽熱量與進入一透明無色雙強度玻璃的之比。這里的熱量包括穿過窗戶的和窗戶吸收的。SC體現(xiàn)了玻璃體系的隔斷陽光的能力或效率；
或：相同條件下，太陽輻射能量透過某玻璃組件的量與透過3毫米透明玻璃的量之比就是該組件的遮陽系數(shù)，用SC表示。遮陽系數(shù)越小，阻擋陽光直接輻射的性能越好。
太陽能總隔斷率%Total Solar Energy Rejected
The ratio of the amount of total solar energy that is prevented from passing through a glazing system to the amount of total solar energy falling on that glazing system.
由玻璃窗隔斷的那部分太陽能是反射總量+玻璃吸收后又向外散發(fā)的那部分能量
隔熱率（熱量降低率）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.
使用薄膜之前透過窗戶的太陽能數(shù)量與使用后的之比。它用百分比來表達。它由無薄膜和有薄膜后的蔭蔽系數(shù)決定的。
保溫率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.
使用薄膜之后進入窗戶的太陽能數(shù)量與之前的比值。用百分數(shù)來表達，它由使用薄膜前后的兩個U值決定的。