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A high efficiency window is made from two pieces of glass with equal cross section (A) and thickness (LG). The gap between the glass plates is filled with argon. The distance between these plates is LAr. Designate the thermal conductivities as kG and kAr. The temperatures are as shown in the diagram. Assume TIN > TJ1 > TJ2 > TOUT
a.) What type of heat flow occurs?
b.) Set up the heat flow equation (H) for the boundaries corresponding to temperatures TIN and TJ1.
c.) Set up the heat flow equation (H) for the boundaries corresponding to temperatures TOUT and TJ2.
d.) Use the results from parts b.) and c.) to calculate TJ1 (algebraic result).
e.) Use the results from parts b.), c.) and d.) to calculate TJ2 (algebraic result).
f.) Assume that LAr = 5LG. The thermal conductivities are kG = 0.8 J/kg-K and kAr= 1.6x10-2 J/kg-K. What is TJ1? (result in terms of TIN and TOUT and numbers only).
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