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Energy Saving of Air Conditioning System by Oscillating Heat Pipe Heat Recovery Using Binary Fluid

This study aims to investigate the enhancement of thermal performance and energy saving of oscillating heat pipe heat exchanger as a heat recovery device in HVAC system by using water, methanol, and binary fluid (water and methanol (50/50) %). The oscillation heat pipe consisted of 8 rows of 7 turns oscillating heat pipe in the air conditioning system. Also investigated the enhancement of the thermal performance of the heat exchanger and the energy-saving by experience water and methanol pure fluids and binary (water-methanol) fluid. The results showed that the increase of inlet air temperature and air velocity had a positive effect on energy saving ratio and the thermal effectiveness of heat exchanger. Also, the thermal effectiveness of the oscillation heat pipe heat exchanger using water as working fluid had lower values in comparison to the other two kinds of working fluids and can be enhanced by 16%, if the binary fluid used instead of it. Also, the energy-saving ratio values for water could be enhanced by 14 % when the binary fluid was used. For all tests, Methanol was recorded higher values for thermal effectiveness and energy-saving ratio than water by 32% and 18% respectively