Heat Transfer CONDUCTION HEAT TRANSFERQk AlmDTDrk2 p LrorilnroriToTirori(2-8)Q2 p k L(DT)ln(ro /ri)where:L = length of pipe (ft)ri= inside pipe radius (ft)ro= outside pipe radius (ft)Example:A stainless steel pipe with a length of 35 ft has an inner diameter of 0.92 ft and an outerdiameter of 1.08 ft. The temperature of the inner surface of the pipe is 122oF and thetemperature of the outer surface is 118oF. The thermal conductivity of the stainless steelis 108 Btu/hr-ft-oF.Calculate the heat transfer rate through the pipe.Calculate the heat flux at the outer surface of the pipe.Solution:Q2 p k L (ThTc)ln(ro/ri)6.28108Btuhr ft °F(35 ft) (122°F118°F)ln0.54 ft0.46 ft5.92 x 105BtuhrRev. 0 Page 13 HT-02
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