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Impact of SHGC on Window Heating Performance Analysis

This study investigates the impact of Solar Heat Gain Coefficient (SHGC) on heating performance of windows. Findings suggest that specifying a minimum SHGC value improves heating efficiency in high-performance windows. However, a fixed SHGC may have varying effects on cooling in different climates. The analysis provides insights for balancing SHGC and U-value in glazing specifications.

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Impact of SHGC on Window Heating Performance Analysis

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  1. Window Performance parameters Impact of SHGC on heating performance: Should the RTF Specify SHGC in Addition to U-Value for Glazing? May 22, 2007

  2. Window U and SHGC Analysis • Analysis designed to jointly review the performance of windows with U-values below .35 • EStar prototype used with 2200 sf and 16.7% glazing (equal orientation) • SHGC and U distributions based on about 45,000 tests in the NFRC database. • Only vinyl frame, double glazed window used • All tests have at least one low-e coating

  3. Window Characteristics

  4. SHGC by U-Value Bin

  5. Product Distribution at Fixed SHGC

  6. Seattle

  7. Missoula

  8. Boise

  9. Boise

  10. Conclusions • In higher performance windows (U>.34), SHGC should be specified to insure perfromance. • Analysis suggests the fixing the SHGC at a minimum value (.33) provides consistant heating performance improvements. • This may be too restrictive and SHGC • Cooling impacts reduce the advantage of a fixed SHGC • In Boise, reduce the effect by 30% • In Seattle and Missoula, reduce the effect by less than 10%

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