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總太陽能穿透率 (Total Solar Transmittance)

The ratio of the amount of total solar energy in the full solar wavelength range (300-2,100 nanometers) that is allowed to pass through a glazing system to the amount of total solar energy falling on that glazing system. Value is usually expressed as a percent.

總太陽能折射率 (Total Solar Reflectance)

The ratio of total solar energy which is reflected outward by the glazing system to the amount of total solar energy falling on the glazing system. On filmed windows this reflectance is a function of the side of the film facing the window surface. Value is usually expressed as a percent.

總太陽能吸收比 (Total Solar Absorption)

The ratio of the amount of total solar energy absorbed by a glazing system to the amount of total solar energy falling on the glazing system. Solar absorption is that portion of total solar energy neither transmitted nor reflected. Since solar transmittance and solar reflectance are measured directly, the following equation should be used in calculating solar absorption. Solar absorption =1.00 - (solar transmittance) - (solar reflectance)

可見光穿透率 (Visible Light Transmittance)

The ratio of the amount of total visible solar energy (380-780 nanometers) that is allowed to pass through a glazing system to the amount of total visible solar energy falling on the glazing system. Value is usually expressed as a percent. Glare is influenced by visible light transmittance through a glazing system.

絕緣材料等阻擋熱通過比 ("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.

遮蔽係數 (Shading Coefficient (SC))

The ratio of the solar heat gain through a given glazing system to the solar heat gain under the same conditions for clear, un-shaded double strength window glass (DSA). Shading coefficient defines the sun control capability or efficiency of the glazing system.

紫外線阻隔率 (Ultraviolet (UV) Rejected)

The ratio of the amount of total UV solar energy (300-380 nanometers) that is not allowed to pass through a glazing system to the amount of total UV solar energy falling on the glazing system. Ultra-violet is one portion of the total solar energy spectrum which greatly contributes to fading and deterioration of fabric and furnishings.

放射率 (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.

太陽能輻射吸收係數 (Solar heat gain coefficient (SHGC))

The SHGC is the fraction of incident solar radiation admitted through a window, both admitted through a window, both directly transmitted, and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a window's solar heat gain coefficient, the less solar heat it transmits.

總太陽能阻隔率 (Total Solar Energy Rejected)

The percent of incident solar energy rejected by a glazing system equals solar reflectance plus the part of solar absorption which is reradiated outward.

太陽能輻射吸收係數 (Solar heat gain reduction)

The ratio of the difference in total solar energy entering before and after installing film on the glass to that entering through the glass with no film. It is expressed as a percentage and is determined by the respective shading coefficients of the glass with and without film.

眩光減少率 (Glare Reduction)

The ratio of the difference in visible transmission of the glass before and after installing film to the visible transmission of the glass with no film. It is expressed as a percentage and is determined by the respective visible transmission values of the glass with and without film.

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