Calculate the annual heat loss [in metric (SI) units] through the following wall assemblies using U-factors from Table 2.9 and the annual heating degree-days over a typical heating season at the geographical location where you reside. Base your analysis on 100 m2 of wall area.
a. 38 mm × 88 mm wood-framed wall with RSI-1.9 insulation
b. 38 mm × 140 mm wood-framed wall with RSI-3.3 insulation
c. 200 mm standard-weight concrete uninsulated wall
d. 200 mm solid brick uninsulated wall
e. 200 mm CMU wall, with perlite insulated cores
f. 350 mm thick uninsulated adobe wall
g. 400 mm solid log wall
h. 575 mm straw bale (RSI-0.01/mm) wall
i. 88 mm SIP with EPS core wall

Table 2.9

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Wall Type Conventional Construction Wood Frame 2 x 4 (38 mm x 88 mm) wall w/ R-11 (RSI-1.9) insulation 2 x 6 (38 mm x 140 mm) wall w/ R-19 (RSI-3.3) insulation Light-Gauge Steel Frame 2 x 4 (38 mm x 88 mm) wall w/ R-11 (RSI-1.9) insulation 2 x 6 (38 mm x 140 mm) wall w/ R-19 (RSI-3.3) insulation Concrete 8 in (200 mm) standard weight uninsulated wall 12 in (200 mm) standard weight uninsulated wall Masonry 8 in (200 mm) solid brick uninsulated wall 12 in (200 mm) solid brick uninsulated wall 8 in (200 mm) CMU uninsulated wall 12 in (200 mm) CMU uninsulated wall 8 in (200 mm) CMU wall, perlite insulated cores 12 in (200 mm) CMU wall, perlite insulated cores hr. ft². °F Btu 10.2 15.4 7.5 9.1 1.5 1.6 2.4 3.2 2.0 2.1 5.5 7.9 R-Value °C m² W 1.8 2.7 1.3 1.6 0.3 0.3 0.4 0.6 0.4 0.4 1.0 1.4 Btu hr. ft² . °F 0.098 0.065 0.133 0.110 0.667 0.625 U-Factor 0.417 0.313 0.500 0.476 0.182 0.127 W °C. m² 0.557 0.369 0.761 0.627 3.786 3.549 2.366 1.775 2.839 2.704 1.032 0.719