A 30 m long pipe with an outside diameter of 75 mm is used to deliver...

A 30 m long pipe with an outside diameter of 75 mm is used to deliver steam at a rate of 2000 kg / hour. The vapor pressure is 198.53 kPa entering the pipe with a quality of 98%. The pipe needs to be given insulation with thermal conductivity of 0.2 W / (m K) so that the vapor quality only slightly decreases to 95%. The outer surface temperature of the insulation is assumed to be 25 ° C. Ignore the resistance conductive from the pipe material and considered no pressure drop in the pipe. a. Determine the enthalpy of incoming steam = kJ / kg.
b. Determine the enthalpy of steam coming out = kJ / kg.
c. Determine the change / heat loss of steam along the flow = watt.
d. Determine the minimum insulation thickness required = cm.

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genius_generous answered 1 year ago

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