Aysar A. Alamery^1,, Zainab F. Mahdi¹, Hussein A. Jawad¹

An improvement of energy saving and the heat transfer characteristics via introducing nanocoating of fins is a new method in HVAC systems. ANSYS software is the preferred choice to design a model for nanocoating on fins in Thermosyphon Heat Exchangers. The investigation of thermal resistance and temperature distribution are presented. The influence of enhancing the working system is examined using different nanocoating metal and metal oxide materials of fins (Ag, Cu, AL, BeO, Al₂O₃ and CuO) in heat pipe. The effect of Nanocoating by metals is explored in which the maximum improvement occurred at the evaporator section in transient operation condition with 71.9585 for AL, 71.383 for Cu and 70.708 for Ag while, the effect of Nanocoating by metal oxide is (73.79 for CuO, 73,41 for AL₂O₃ and 71.96 for BeO). The obtained results showed that the best nanocoat material for this purpose is the aluminum for metals and copper oxide for metal oxides. The calculations give important indication that using the nanocoating just in the evaporator section to reduce the cost. The large amount of heat transfer occur in the evaporator section according to the result of thermal resistance in this section then large benefit of latent heat of the air is guiding to increase the energy saving when using HPHE in HVAC systems.

HVAC, HP (Thermosyphone) HE, ANSYS, Nanocoat, temperature distribution, Thermal resistance