Experimental study of R142b in low-temperature energy conversion system based on Organic Rankine Cycle
Experimental investigation of a low-temperature energy-to-power conversion system was presented using R142b as the working fluid.Screw compressor worked in the reverse operation as the expander.The heat source in this experiment was lower than 80 ℃.The maximum energy conversion efficiency was 6％ with the systematic efficiency up to 5.16％.Due to the high energy consumption in the transmission process,although the expansion efficiency was as high as 97％ in maximum,the mechanical efficiency was only 48％-65％,which lead to a low systematic efficiency.The maximum exergy efficiency was 32％.Higher evaporating pressure and lower condensing pressure raised the power output,which followed the theoretical principle.Theoretically,the inlet of liquid had no advantage in the expansion.The qualitative experimental result shows that for R142b,inlet of liquid improves the expansion slightly.But this promotion comes mainly from the reduction of leakage,which means lower outlet temperature and pressure,larger enthalpy difference and higher expansion efficiency.The experiments prove the feasibility of this energy conversion concept.However,the systematic efficiency is still considerably low,and further optimization work is required.
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