Performance Improvement of the Heat Recovery Unit with Sequential Type Heat Pipes Using Water Based ZnO and ZnOAl2O3 Nanofluids

Waste heat recovery units used in the industry and in many waste heat facilities are the systems used for pre-heating the required clean air. In this study, an applied study was carried out on the experimental setup created to improve the performance of a heat recovery unit with heat exchanger heat pipe and thus increase the operating temperature range. The unique feature of the study is the use of nanofluids that have found many applications in heat pipes used as heat exchangers in recent years. ZnO / Water and ZnOAl2O3 / Water nanofluids are used as working fluid in the heat pipe and the recovery rates of heat recovery unit thermal performance are tried to be determined according to the basic fluid water. In the cold air zone (condenser), when the cold air velocity was 0.437m / s and Re = 7100, 90% and 80% improvement was achieved for ZnOAl2O3 and ZnO nanofluids, respectively.