An 11-in. thick precast concrete curtain wall consists of a 3-in.-thick exterior layer of (normal-weight) concrete, 6-in.-thick interior layer of (normal-weight) concrete and a 2-in-thick XPS insulation sandwiched between the two concrete layers. What is the total R-value of the assembly, considering air-to-air heat transfer? ?-value of normal-weight concrete = 0.15; ?-value of XPS = 5.0
What will be an ideal response?
R-value of 3-in-thick concrete layer = (3)0.15 = 0.45
R-value of 2-in-thick XPS = (2)5.0 = 10.0
R-value of 6-in-thick concrete layer = (6)0.15 = 0.90
Rsi = 0.7
Rso = 0.2
Total R-value of curtain wall assembly = 0.45 + 10.0 + 0.90 + 0.7 + 0.2 = 12.25
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