Example: Determine the average convection heat transfer coefficient for the 2. 5-m high vertical walls of a home having respective interior air and wall surface temperature of(a)20 and 10C and (b)27 and 37C KNOWN: Interior air and wall temperatures; wall height. FIND:(a) Average heat transfer coefficient when T=20'C and Ts =10C, (b) Average heat transfer coefficient when Too=27C and Ts =37'C SCHEMATIC A、 Wall height 3 L-257 =20 G=27℃ a win nTer condITion 6 Summer condition ASSUMPTIONS:(a) Wall is at a uniform temperature, (b) Room air is quiescent. mk=005Wm.=209×10mr010(30K1amn==3279 62 10°K,v=16539×10mk=20027Wx=22820m=076 ANALYSIS: The appropriate correlation for the average heat transfer coefficient for free convection Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 10 Example: Determine the average convection heat transfer coefficient for the 2.5-m high vertical walls of a home having respective interior air and wall surface temperature of (a) 20 and 10 ºC and (b) 27 and 37 ºC