'U' values ??are defined as follows: under ASHRAE standard conditions, since the glass thermal conductivity and the temperature difference between indoor and outdoor air is formed to transfer heat air. Its imperial units: British thermal units per hour per square foot per Fahrenheit lowe glass prices, metric units: watts per square meter per degrees Celsius, 'u' value is lower, the heat transfer through the glass also lower steel plastic folder lowe glass, the better the insulating properties of the window glass. Radiation rate is the ratio of heat per unit area of ??an object with radiation heat per unit area blackbody radiation at the same temperature, the same conditions. Emissivity of an object is defined as the ability to absorb or reflect heat. In theory totally blackbody for all wavelengths with 100% absorption. That reflection rate is zero. Thus, blackbody radiation was 1.0. 'Low-E' superiority is unquestioned. Since 1990 lowe glass, 'Low-E' in the United States in the amount of 5% annually. Future, 'Low-E' is becoming a dominant position is not that window, but the owners and window company attaches great importance to energy-efficient doors and windows. Moreover, this year, the vast majority of buildings is to use it to evaluate the effect of energy saving merits. lowe glass prices | Yaohui trusted (authenticated) | Weifang lowe glass provided by Jinan Glass Co., Ltd. Yaohui. Jinan Yaohui Glass Co., Ltd. (www.jyhhc.com/) quality of service and products, continue to receive the recognition and trust of new and old customers and the industry. Our company is a certified member of the whole alliance network operators, business alliance customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!