A duct has a cross sectional area as shown below is used to carry heated water, the external surface of the pipe is subjected to a convective heat transfer coefficient of h = 6 W/m°K, find the heat loss by convection per meter length of the duct when the external surface temperature is 80°C and the surroundings are at 20°C. Assuming black body radiation what is the heat loss by radiation?. 15 cm 15 cm R = 10 cm 15 cm 15 cm R = 10 cm

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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In this question .. how to get the*** surface area ****of the shape attached 

we should use area or circumfrence rules  ??? 

 


and what will be Q value 

 

 

A duct has a cross sectional area as shown below is used to carry heated water, the external
surface of the pipe is subjected to a convective heat transfer coefficient of h = 6 W/m°K, find
the heat loss by convection per meter length of the duct when the external surface
temperature is 80°C and the surroundings are at 20°C. Assuming black body radiation what is
the heat loss by radiation?.
15 cm
15 cm
R = 10 cm
Transcribed Image Text:A duct has a cross sectional area as shown below is used to carry heated water, the external surface of the pipe is subjected to a convective heat transfer coefficient of h = 6 W/m°K, find the heat loss by convection per meter length of the duct when the external surface temperature is 80°C and the surroundings are at 20°C. Assuming black body radiation what is the heat loss by radiation?. 15 cm 15 cm R = 10 cm
15 cm
15 cm
R = 10 cm
Transcribed Image Text:15 cm 15 cm R = 10 cm
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