A building has a double-glazed vertical window with an air space between the two glasses. The...

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A building has a double-glazed vertical window with an air space between the two glasses. The glass thickness is 6 mm and thermal conductivity is 0.8 W/m.K. The indoor air conditions are 20 °C and 50 % RH. The outdoor air temperature is 30 °C with 90% RH on a very humid day. The ambient pressure is 101.3 kPa. (i) Calculate the rate of heat loss through the center of the window. (5 marks) (ii) Will condensation occur on the exterior surface of the window? Answer this question by calculation. (5 marks) (iii) Will condensation occur on the exterior surface of the window if a single-glazed window was used? Answer this question by calculation. (5 marks) Data given: The interior heat transfer coefficient within the gap between the two glasses can be found to be 6.0 W/m².K. The heat transfer coefficients of interior (indoor surface of the window) and exterior (outdoor surface of the window) surfaces are 8.3 W/m²-K and 34 W/m²-K respectively. A building has a double-glazed vertical window with an air space between the two glasses. The glass thickness is 6 mm and thermal conductivity is 0.8 W/m.K. The indoor air conditions are 20 °C and 50 % RH. The outdoor air temperature is 30 °C with 90% RH on a very humid day. The ambient pressure is 101.3 kPa. (i) Calculate the rate of heat loss through the center of the window. (5 marks) (ii) Will condensation occur on the exterior surface of the window? Answer this question by calculation. (5 marks) (iii) Will condensation occur on the exterior surface of the window if a single-glazed window was used? Answer this question by calculation. (5 marks) Data given: The interior heat transfer coefficient within the gap between the two glasses can be found to be 6.0 W/m².K. The heat transfer coefficients of interior (indoor surface of the window) and exterior (outdoor surface of the window) surfaces are 8.3 W/m²-K and 34 W/m²-K respectively.

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