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  3. 12 the inner and outer surfaces temperatures of a 05cm...

Question: 12 the inner and outer surfaces temperatures of a 05cm...

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12. The inner and outer surfaces temperatures of a 0.5-cm thick 2-m x 2-m window glass in winter are 10°C and 3°C, respectively, if the thermal conductivity of the glass is 0.78 W/m.K, determine the amount of heat loss through the glass over a period of 5 h. what would your answer be if the glass were 1 cm thick? 13. Hot air at 80°C is blown over a 2-m x 4-m flat surface at 30°C. If the average convection heat transfer coefficient is 55 W/m2 K, determine the rate of heat transfer from the air to the plate, in kW 14. The inner and outer glasses of a 1.2-m x 1.2-m double pane window are at 15°C and 90C, respectively. If the 6-mm space between the two glasses is filled with still air determine the rate of heat transfer through the window.

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