The inner and outer glasses of a 4-ft × 4-ft double-pane window are at 60°F and 48°F, respectively. If the 0.25-in space between the two glasses is filled with still air, determine the rate of heat transfer through the window.
What will be an ideal response?
The inner and outer glasses of a double pane window with a 0.5-in air space are at specified temperatures. The rate of heat transfer through the window is to be determined
Assumptions 1 Steady operating conditions exist since the surface temperatures of the glass remain constant at the specified values. 2 Heat transfer through the window is one-dimensional. 3 Thermal properties of the air are constant.
Properties The thermal conductivity of air at the average temperature of (60+48)/2 = 54°F is k = 0.01419 Btu/hft°F (Table A-15E).
Analysis The area of the window and the rate of heat loss through it are
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