Consider a gas-fired boiler in which five coiled,
Chapter 10, Problem 10.17(choose chapter or problem)
Consider a gas-fired boiler in which five coiled, thin-walled, copper tubes of 25-mm diameter and 8- mlength are submerged in pressurized water at 4.37 bars.The walls of the tubes are scored and may be assumedto be isothermal. Combustion gases enter each of thetubes at a temperature of Tm,i?700?C and a flow rateof , respectively.(a) Determine the tube wall temperature Tsand the gasoutlet temperature Tm,ofor the prescribed conditions.As a first approximation, the properties of the com- bustion gases may be taken as those of air at 700 K.(b) Over time the effects of scoring diminish, leadingto behavior similar to that of a polished coppersurface. Determine the wall temperature and gasoutlet temperature for the aged condition
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