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2750 Z. Shengjun et al. / Applied Energy 88 (2011) 2740–2754 Fig. 10. Recovery efficiency of different working fluids under the optimized operation parameters. Fig. 11. Variation of APR with the condensing temperature and evaporating temperature. pressure than that of R41, which meant the optimum operating pressure was higher for R41. Different from comparing the two cycles with the same inlet and outlet temperature of heat transfer fluid in each heat exchan- ger, this article evaluated the exergy efficiency under the optimum working conditions. So, the input available energy of the system for each fluid was different. The specific irreversibility or irreversibil- ity rate could not be used as the indicator to reveal the irreversibil- ity of each component among different working fluids. For sake of comparison, it was better to use the exergy destruction factor (EDF), which was the ratio of the exergy destruction in a compo- nent to the power produced by the overall system [54]. Table 6 showed the exergy related performance for different working fluids at optimum design. The distribution of the irrevers- ibility in different components could be demonstrated by the EDF value of each component. It could be observed that the evaporator/ vapor generator provided the highest EDF value, which indicated that it had the biggest contribution to the overall irreversibility fol- lowed by the turbine. And the refrigerant pump took the least por- tion. In view of these results, efforts should be made to improve the temperature matching between the heat source and the working fluid in the evaporator/vapor generator. As presented in Table 6, the EDFc and EDFr,p in transcritical power cycle were much higher than that in subcritical cycle leading to a high EDFtotal value for thePDF Image | Performance comparison and parametric optimization of subcritical Organic Rankine Cycle (ORC) and transcritical power cycle system for low-temperature geothermal power generation
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