A double-glazed window consists of two sheets of glass separated by an L = 0.2-mm-thick gap. The

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A double-glazed window consists of two sheets of glass separated by an L = 0.2-mm-thick gap. The gap is evacuated, eliminating conduction and convection across the gap. Small cylindrical pillars, each L = 0.2 mm long and D = 0.15 mm in diameter, are inserted between the glass sheets to ensure that the glass does not break due to stresses imposed by the pressure difference across each glass sheet. A contact resistance of R"t,c  =1.5 X 10–6 m· K/W exists between the pillar and the sheet. For nominal glass temperatures of T1 = 20°C and T= 10°C, determine the conduction heat transfer through an individual stainless steel pillar.

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Fundamentals Of Heat And Mass Transfer

ISBN: 9780470501979

7th Edition

Authors: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt

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