6.71 A laboratory experiment involves simultaneous heat and mass transfer from a water-soaked towel experiencing irradiation from a bank of radiant lamps and parallel flow of air over its surface. Using a convection correlation to be introduced in Chapter 7, the average heat transfer convection coefficient is estimated to be h = 28.7 W/m2.K. Assume that the radiative properties of the towel are those of water, for which a = ɛ =0.96. and that the surroundings are at 300 K. (a) Determine the rate at which water evaporates from the towel, na (kg/s). (b) Perform an energy balance on the towel to deter-mine the net rate of radiation transfer, qmd (W), to the towel. Determine the irradiation G (W/m²).

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671 a laboratory experiment involves simultaneous heat and mass transf

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6.71 A laboratory experiment involves simultaneous heat and mass transfer from a water-soaked towel experiencing irradiation from a bank of radiant lamps and parallel flow of air over its surface. Using a convection correlation to be introduced in Chapter 7, the average heat transfer convection coefficient is estimate