Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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The owner of a new bespoke home would like a large (6 mx 2.5 m) panoramic window installed to enjoy the countryside views and is insisting on it, regardless of the cost. You have a slimline window frame (k = 0.15 W/m K) which protrudes 50 mm into the opening and is 80 mm deep. It can hold glazing from 30 to 50 mm deep. You have the following glazing options available: 4 mm, 5 mm and 6 mm standard clear glass (k = 1 W/m K) 4 mm and 5 mm low iron glass (k = 0.8 W/m K) Both types of glass can be coated with a low-emissivity coating which reduces the convective heat transfer coefficient by 10%. Any cavity formed in the glazed units can be gas filled with either Air (k = 0.024 W/m K) Argon (k = 0.016 W/m K) The internal and external convective heat transfer coefficient are 5 W/m² K and 10 W/m² K respectively. a) Design an appropriate window configuration for the opening. b) Clearly stating any assumptions, calculate the thermal resistance of your glazing design, you can ignore any effects of glazing spacers on the thermal performance. c) If the internal temperature is held at 20°C and the external temperature is -5°C, clearly stating any assumptions, calculate the heat loss through the window. You may ignore any radiation effects. d) If the wind outside increases to 50 km/h and Nusselt number Nu = 0.03 Reº.6, calculate the new external convective coefficient, h, and assess the impact this has on the overall heat transfer through the window. Comment on the result.
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Transcribed Image Text:The owner of a new bespoke home would like a large (6 mx 2.5 m) panoramic window installed to enjoy the countryside views and is insisting on it, regardless of the cost. You have a slimline window frame (k = 0.15 W/m K) which protrudes 50 mm into the opening and is 80 mm deep. It can hold glazing from 30 to 50 mm deep. You have the following glazing options available: 4 mm, 5 mm and 6 mm standard clear glass (k = 1 W/m K) 4 mm and 5 mm low iron glass (k = 0.8 W/m K) Both types of glass can be coated with a low-emissivity coating which reduces the convective heat transfer coefficient by 10%. Any cavity formed in the glazed units can be gas filled with either Air (k = 0.024 W/m K) Argon (k = 0.016 W/m K) The internal and external convective heat transfer coefficient are 5 W/m² K and 10 W/m² K respectively. a) Design an appropriate window configuration for the opening. b) Clearly stating any assumptions, calculate the thermal resistance of your glazing design, you can ignore any effects of glazing spacers on the thermal performance. c) If the internal temperature is held at 20°C and the external temperature is -5°C, clearly stating any assumptions, calculate the heat loss through the window. You may ignore any radiation effects. d) If the wind outside increases to 50 km/h and Nusselt number Nu = 0.03 Reº.6, calculate the new external convective coefficient, h, and assess the impact this has on the overall heat transfer through the window. Comment on the result.
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