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A thermopane window consists of two pieces of glass with a thickness of Lglasseach.

A thermopane window consists of two pieces of glass with a thickness of Lglasseach. The two glasses enclose an air space with a thickness of Lgap.The windowseparates room at Troomfrom outside ambient air at Tout(Troom>Tout). Theconvection heat transfer coefficient associated with the inner (room side) surface ishiand the convection coefficient associated with the outer ( ambient) air ho. Thewindow has a length of H and a width of W. The radiation is neglected.The airenclosed between the panes is assumed to be stagnant. The thermal conductivity ofthe glass is Kglassand the air thermal conductivityis Kair1.Sketch the equivalent thermal circuit of the system , and express all theresistances in terms relevant variables . Labelheat flow direction2.What is the heat loss through a window.3.If the heat transfer by radiation is taken into consideration on the outersurface, and the surrounding temperature Tsur=Tout. Re-sketch the normalcircuit

 
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