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# ProbSet3 - ME 416 Computer Assisted Design of Thermal...

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1 ME 416 Computer Assisted Design of Thermal Systems Practice Problem Set #3 Thermal Environmental Engineering, Engineering Economics, and Air/Water Vapor Systems 1. Determine the heat flux through a wall whose inside surface temperature is 30°C and outside surface temperature is 18°C. The wall has the following structure. Inside Wall Surface 1 cm plaster board with k = 0.17 W/m K 10 cm air gap with h = 1.5 W/m 2 K across gap (wood studs of k = .14 W/m K make-up 15% of the area across the gap) 0.5 cm hardboard siding with k = 0.094 W/m K 0.2 cm vinyl siding with k = 0.20 W/m K Outside Wall Surface 2. Determine the heat flux for the wall above if the air space is filled with insulation of k = 0.05W/m K 3. Determine the heat transfer and outside surface temperature for a south facing wall of surface area 15 m 2 which receives 250 W/m 2 solar irradiation. The outside air temperature is 10°C and the inside air temperature is 25°C. The outside convective heat transfer coefficient is 38 W/m 2 K and the thermal resistance from the outside wall surface to the inside air is 1 m 2 K/W.

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ProbSet3 - ME 416 Computer Assisted Design of Thermal...

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