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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![Problem 3
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 Qs=900 W/m². Both towel surfaces are exposed
to the atmospheric (sky) and ground radiation of Qshy=200 W/m² and Qg=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 o= 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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F778948b5-eb10-4478-81dd-a2eb6ec8b4da%2F9cb8cd56-dbff-46e0-a6ab-a48d0e57031c%2Fou05mhf_processed.png&w=3840&q=75)
Transcribed Image Text:Problem 3
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 Qs=900 W/m². Both towel surfaces are exposed
to the atmospheric (sky) and ground radiation of Qshy=200 W/m² and Qg=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 o= 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.
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