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234 °C steam flows in a pipe which features are given below. Inner and outer diameters of pipe are 300 mm and 320 mm. Coefficient of heat transmission is 40 W/mK. It's external ambient is air and it's temperature is 20 °C. Take the temperature of the pipe's external surface 180 °C. It is known that the internal temp convection coefficient is 600 W/ m2K. The pipe's length is 500 meter. You need to add the radiation in the calculation. The rate of the radiation emissivity is 0.85. You can take the environmental surface temp directly.Calculate the heat loss of pipe.
Note) use the relation below which is the indoor horizontal pipe equation to external temp convection coefficiency. Equations to be used are attached!
Transcribed Image Text:4
A0
hev=1,25x
De
AO = |Ose - Ba ;
Ose = surface temperature
Oa = ambient air temperature inside the building
De (m)= outer diameter
%3D
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