2021
Q: How do you calculate annual the heat loss of a window? A: QT-srfc = Areawin ( ft2 )
In 1. 2. 3. 4.
U-Valuewin ( Btu / hr-ft2-F )
ft (%)
Gt ( kFhr / yr)
order to calculate the transmission heat loss for each surface of a building, we need to: Determine the window area Determine the window’s U-Value Determine the temperature correction factor Determine the annual difference in temperature between inside and outside
bldgtyp | NYPH
Window U-Value(s)
NYPH: Up and Running with PHPP
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