Q2/ A thermopane window consists of two pieces of glass 7 mm thick that enclose an air space 7 mm thick. The window separates room air at 20°C from outside ambient air at -10°C. The convection coefficient associated with the inner (room-side) surface is 10 W/m K. Ifthe convection coefficient associated with the outer (ambient) air is 80 W/m? K, what is the heat loss through a window that is 0.8 m long by 0,5 m wide? Neglect radiation,[ kglass 1.4 W/m-K: kair -0.0245 W/m-K] - Window, 0.8 m x 0.5 m Glass Air !! Tmi 20 °C hi= 10 Wim2 K Air1I L=0.007 m To-10 °C ho 80 W/m2-K Air

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Q: Q2/ A thermopane window consists of two pieces of glass 7 mm thick that enelose an air space 7 mm…

A: T∞i=20°C, hi=10 Wm2KL=L1=L2=L3=.007 mA=.8×.5=.4 m2Kg=1.4 WmK and Kair=.0245 Wm Kh0=80 Wm2K,T∞0=-10°C…

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.