Abstract: The waste heat recovery by heat pipes is an excellent way to save energy. A study was performed on the applications of  heat pipe heat exchangers  for the heat  recovery with energy saving and the effectiveness of the Conventional Heat Pipe (CHP) and Two-Phase  Closed Thermosyphon (TPCT) heat exchangers. The relevant papers were analysed to support future works and the experimental studies were summarised. This study also provides the analysis of performance of heat pipe heat exchangers in the heat recovery system.

Key words: Heat pipe, Recovery, Effectiveness