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Heat Exchangers Rev 02 - Nc State University
www4.ncsu.edu118 Figure 3: Fluid Temperature Profiles in a Double Pipe Heat Exchanger If we let Δz be a differential length, then the heat transfer across the differential length segment is q =dQ&=UdA(TH −TC) (28) where dA is the differential area associated with length dz.The total heat transferred across the heat exchanger is