heat transfer
Prairie View A&M University
Department of Mechanical Engineering
Advanced Heat Transfer
MCEG 5223
Mid Term Exam
Due: Friday, October 16, 2015
- How much heat will be lost through a double glass panel window measuring 1.83 m by 3.66 m on a cold day when inside and outside air temperature are, respectively, 22 oC and -23 oC? Convective coefficients on inside and outside surfaces of the window are 20 W/m2.K and 15 W/m2.K respectively. Assume each glass pane to be 1.5 mm thick with air gap between the pane of 1.5 mm. What temperature drop will exist across each of the glass panes? What will be the average temperature of the air between the glass panes?
- Turbine blades mounted on a rotating disk in a gas turbine engine are exposed to a gas stream that is at T∞ = 1200 oC and maintains a convective coefficient of h=250 W/m2.K over the blade. The blades, which are fabricated from Inconnel, k= 20 W/m.K, have a length of L = 50 mm. The blade profile has a uniform cross-sectional area of Ac = 6 X 10-4 m2 and a perimeter of P = 110 mm. A proposed blade cooling scheme, which involves routing air through the supporting disc, is able to maintain the base of each blade at a temperature of Tb = 300 oC. If the maximum allowable blade temperature is 1050 oC and the blade tip may be assumed to be adiabatic, is the proposed cooling scheme satisfactory?
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