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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