Consider the composite wall of Problem 3 13 under conditions for which the inside air is still characterized by T i 20C and h i 30 W m 2 K However, use the more realistic conditions for which the outside air is characterized by a diurnal (time) varying temperature of the form with h o 60 W m 2 K Assuming quasi steady conditions for which changes in energy storage within the wall may be neglected, estimate the daily heat loss through the wall if its total surface area is 200 m 2 5 sin 24 273 To, (K) 0 1 12h ) T, o(K) 273 11 sin 24 12

Question: Consider the composite wall of Problem 3.13 under conditions for which the inside air is still characterized by T .i = 20C and h i

Consider the composite wall of Problem 3.13 under conditions for which the inside air is still characterized by T _∞.i = 20°C and h_i = 30 W/m² ∙ K. However, use the more realistic conditions for which the outside air is characterized by a diurnal (time) varying temperature of the form

5 sin 24 = 273 + To, (K) 0<1<12h ) T, o(K) = 273 + 11 sin 24 12 <IS 24 h

with h_o = 60 W/m² ∙ K. Assuming quasi steady conditions for which changes in energy storage within the wall may be neglected, estimate the daily heat loss through the wall if its total surface area is 200 m².

5 sin 24 = 273 + To, (K) 0

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