INFLUENCE OF ANTICORROSION COATING ON THERMAL AND EXERGETIC PERFORMANCES OF HEAT EXCHANGERS

In this study, a novel heat exchanger efficiency approach is proposed based on various industrial heat exchanger designs. The approach is used to check and calculate three types of heat exchangers with anticorrosion coating, to study the thermal and exergetic performances of heat exchangers changes with the thermal conductivity of anticorrosion coating when the heat fluids are gas-gas, gas-liquid, and liquid-liquid, respectively. The results demonstrate that the overall heat transfer coefficient of all heat exchangers increases with increase of the thermal conductivity of coating at different cold stream Re numbers, and the greater the cold stream Re number achieved, the bigger the increasing extent acquired. Coating's thermal conductivity has a small impact on exergy recovery efficiency in gas-gas and gas-liquid heat exchangers but has a great impact on the liquid-liquid heat exchanger. The welded corrugated air preheater experiment is performed to verify the novel heat exchanger efficiency approach, and the results show that the maximum heat transfer coefficient and exergy recovery efficiency discrepancy between calculation and experimental data is within 13% and 16%, respectively.