Ignoring convective heat transfer, estimate the change in U-factor by replacing argon by krypton in the quadruple
Question:
Ignoring convective heat transfer, estimate the change in U-factor by replacing argon by krypton in the quadruple glazed windows described in
Table 6.3.
You can ignore radiative heat transfer since these are low-emissivity windows.
Transcribed Image Text:
Material Thickness R-value (SI) R-value (US) (m² K/W) (ft? F hr/BTU) Gypsum drywall 1/2" 0.079 0.45 Plywood 3/4" 0.19 1.08 Hollow-backed vinyl siding 0.11 0.62 Wood shingles 0.15 0.87 Fiberglass batt 3.5"/8" 2.0/4.6 12/26 Blown cellulose 0.21- 2.9–3.4/in 0.24/cm Rigid (polyisocyanurate) 0.37- 5.3-7.1/in foam 0.49/cm Mineral fiber 2 0.2/cm 2.75/in Common brick 4" 0.14 0.80 Concrete masonry unit (CMU) 4"/8" 0.14/0.19 0.80/1.11 Window type U-factor U-factor (US) (SI)
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