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...Heat transfer mechanisms of conduction dq k adt dt dx where q is the amount btu transferred in time t h o thermal conductivity ais area normal to flow ft tis temperature f x thickness path convection ha coefficient che ddesign iesign i radiation at stefan boltzmann constant r emissivity surface exposed for absolute overall definition u ua tot ttot total difference driving force process important an approximate value it defined combination with a e g inside outside pipe flux out general correlation intensity potential resistance rate applies electricity etc transport...