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Window U-factor effects on residential cooling load.

Author(s) : SULLIVAN R., FROST K. J., ARASTEH D. K., SELKOWITZ S.

Summary

The DOE-2.1D energy analysis simulation program was used to analyze the hourly, daily, monthly, and annual cooling loads as a function of window U-factor. The performance of a prototypical single-story house was examined in three locations. The results show that, when comparing windows of the same size with identical orientations and shading coefficients, windows with higher U-factors often yield lower annual cooling loads, but windows with lower U-factors yield lower peak cooling loads. This occurs because the window with the higher U-factor conducts more heat from inside the residence to the outside during the morning and evening hours, when the outside air temperature is often lower than the inside air temperature; a window with a lower U-factor conducts less heat from outside to inside during summer afternoons peak cooling hours.

Details

  • Original title: Window U-factor effects on residential cooling load.
  • Record ID : 1996-0405
  • Languages: English
  • Source: ASHRAE Transactions 1994.
  • Publication date: 1994
  • Document available for consultation in the library of the IIR headquarters only.

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