STUDIES ON A DOUBLE TUBE HEAT EXCHANGER WITH NOVEL SURFACE ENHANCEMENT FOR SINGLE PHASE AND MULTI-PHASE HEAT TRANSFER

The study is conducted to evaluate the performance of a straight double tube heat
exchanger using two novel and versatile enhancement configurations, namely TurboC
(Copper Top Cross) and EXTEK (Twisted Multi-Head), usable in single phase
forced convection as well as in phase change. Such tubes are used in condensation as
well as evaporation in a double tube heat exchanger assembly, typically as used in
water source heat pumps. The study covers several aspects, viz., establishment of the
flow development length, local and total friction factors, convective heat transfer in
single-phase flow, two-phase pressure drop and condensation heat transfer.