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final exam closed book solutions

final exam closed book solutions - 1 If the spectral...

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1. If the spectral emissivity of a material increases with increasing wavelength, how does its total emissivity vary with temperature? It goes up since lambda T goes up. (2 pts) 2. Consider the geometry below. Obtain an expression for the view factor of the groove with respect to the surroundings outside the groove. (4 pts) 3. In a counterflow heat exchanger, heat exchange occurs between hot water flowing at 2 kg/s and cold water flowing at 8 kg/s. Which fluid will experience the largest temperature change? Why? (4 pts)
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