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Unformatted text preview: 25ºC and with a convection coefficient of 8 W/m 2 K? (2) A further condition for good results is a maximum-minimum temperature difference of less than 10ºC. Is this condition satisfied? 3. A large slab of aluminum having a thickness of 5 cm is initially at a temperature of i T = 70°C, and both surfaces of the plate are suddenly exposed to a convection environment at T = 20°C with h = 800 W/m 2 °C. Find the temperature difference between the center and the plate surface at 30 seconds later. 4. A very thick plane wall is made of common brick (see Table A.3 for its thermophysical properties). It is initially at a uniform temperature of 20ºC. Now it is suddenly exposed to a convection environment at 30ºC with the convection heat transfer coefficient of 50 W/m 2 K. What will be the surface temperature of the plate after 1000s?...
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This note was uploaded on 10/05/2011 for the course ME me352 taught by Professor Koraykadirsafak during the Spring '11 term at Yeditepe Üniversitesi.
- Spring '11
- Heat Transfer