A wet towel hangs on a clothes line under conditionsfor
Chapter 12, Problem 12.145(choose chapter or problem)
A wet towel hangs on a clothes line under conditionsfor which one surface receives solar irradiation ofGS?900 W/m2and both surfaces are exposed toatmospheric (sky) and ground radiation of Gatm?200 W/m2and Gg?250 W/m2, respectively. Undermoderately windy conditions, airflow at a temperatureof 27C and a relative humidity of 60% maintains aconvection heat transfer coefficient of 20 W/m2?K atboth surfaces. The wet towel has an emissivity of 0.96and a solar absorptivity of 0.65. As a first approxima-tion the properties of the atmospheric air may be eval-uated at a temperature of 300 K.Towel (Ts, , S)Ground AirDetermine the temperature Tsof the towel. What isthe corresponding evaporation rate for a towel that is0.75 m wide by 1.50 m long?
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