Question: 18.2 A controlled temperature test room is held at 25C. The outside design temperature is 40C. The wall is constructed with 2.5 cm pine boards

18.2 A controlled temperature test room is held at 25"C. The outside design temperature is 40"C. The wall is constructed with 2.5 cm pine boards (k = 0.12 Wm Ko) on the inside and the outside with 10 cm mineral wool block insulation (* = 0.05 Wm 'K') in between. The pine boards are placed in position over the insulation by 1.875 cm steel through-bolts placed at 30 cm centres. Compute the overall heat-transfer coefficient: (i) Not considering the presence of bolts. (ii) Considering the presence of bolts. The film coefficient on both sides of the wall is 9.4 Wm K

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