![]() SHGC is approximately equal to the SC multiplied by 0.87.ī U-factor is a measure of the rate of heat flow through a window. ![]() SHGC has replaced shading coefficient (SC) as the standard indicator of a window's shading ability. SHGC ranges between 0 and 1 the lower the number, the lower the transmission of solar heat. Triple-paned, tinted, two spectrally selective low-e coatings, krypton-filled, wood or vinyl frameĪ SHGC, or Solar Heat Gain Coefficient, is a measure of the solar radiation admitted through a window. Cost effectiveness of using improved windows Performanceĭouble-paned, clear glass, aluminum frameĭouble-paned, low-e coating, wood or vinyl frame The costs are calculated using a computer program called RESFEN developed by US Department of Energy. The table shows the cost effectiveness of replacing old windows with new and improved windows. The monetary savings = \$402.06 per year.Ī d d i t i o n a l I n v e s t m e n t S a v i n g s p e r y e a r = $ 1550.00 $ 402.06 = 3.85 y e a r s The new heating bill would be 43.743 M M B t u * $ 11.15 M M B t u = $ 487.73 The old heating bill would be 79.803 M M B t u * $ 11.15 M M B t u = $ 889.80 The percent savings is 36.06 M M B T U 79.84 M M B T U × 100 = 45.1 % What is the pay back period for this modification?Ī) New heat loss for the same window size with the new R-value isģ80 ft 2 × 6,000 ° F days × 24 h / day 4. ![]() What is the percent savings in the energy and the heating bill if the energy cost is 11.15/MMBTUs.The upgraded windows have an R-value of 4.0. Windows in the house described in Example 1 are upgraded at a cost of \$1,550.
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