A wet towel (a=75 cm wide, b=1.5 m long) hangs on a cloths line under conditions for which one towel surface receives solar radiation of Q=900 W/m2 . Both towel surfaces are exposed to the atmospheric (sky) and ground radiation of Qsky=200 W/m² and Og=250 W/m², respectively. Under the moderately windy conditions (airflow at a temperature T, = 27 °C, air relative humidity =60%) the convective heat transfer coefficient is OF 20 W/m²-K at both towel surfaces. The wet towel has an emissivity of = 0.96 and the solar absorption coefficient a,=0.65. Determine the towel temperature and the corresponding evaporation rate of moisture from the towel. Assume the air properties at temperature T. = 27 °C.

A wet towel (a=75 cm wide, b=1.5 m long) hangs on a cloths line under conditions for which one towel surface receives solar radiation of Q=900 W/m2 . Both towel surfaces are exposed to the atmospheric (sky) and ground radiation of Qsky=200 W/m² and Og=250 W/m², respectively. Under the moderately windy conditions (airflow at a temperature T, = 27 °C, air relative humidity =60%) the convective heat transfer coefficient is OF 20 W/m²-K at both towel surfaces. The wet towel has an emissivity of = 0.96 and the solar absorption coefficient a,=0.65. Determine the towel temperature and the corresponding evaporation rate of moisture from the towel. Assume the air properties at temperature T. = 27 °C.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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