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A 6-m-long section of an 8-cm-diameter horizontal hot-water pipe shown in 9 Fig. 9-15 passes through a large room whose temperature is 20C. If the outer surface temperature of the pipe is 70C, determine the rate of heat loss from the pipe by natur convection. The Propertles The properties of air at the fim iemperiture of Tf=(T1+T)/2=(70+20)/2=45C and 1 atm are (16) TaBe A-15) RaL=GrLPr=v2(T1Tx)LPr