A study of secondary heat recovery efficiency of a heat pipe heat exchanger air conditioning system

A heat pipe air conditioning (AC) system which used heat pipe heat exchanger (HPHE) to realize secondary heat recovery was proposed. With the meteorological parameter of Hefei city (31°53′N and 117°15′E) as the reference, we analyzed the consuming energy between secondary heat recovery HPHE AC system and the common heat recovery HPHE AC system theoretically. The analysis of experimental data revealed that the average heat recovery efficiency of the HPHE AC system in winter is 21.08%, while 39.2% in summer. The results show that the secondary heat recovery HPHE AC system has a certain energy-saving advantage.