Thermodynamic and multi-objective optimisation of solar-driven Organic Rankine Cycle using zeotropic mixtures |
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Authors: | Deepak Tiwari Ahmad Faizan Sherwani Akhilesh Arora |
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Affiliation: | 1. Department of Mechanical Engineering, Jamia Millia Islamia , New Delhi, India;2. Department of Mechanical Engineering, Delhi Technological University , Delhi, India |
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Abstract: | This paper communicates the performance of low-grade solar heat source powered Organic Rankine Cycle (ORC). To investigate the system performance, first law and exergetic efficiencies, power output are evaluated and compared for zeotropic mixtures of (iso)butane/(iso)pentane and cyclohexane/R123. The results indicate that there exists an optimal mass fraction for which energy and exergetic efficiencies, and power output are maximum corresponding to a given value of expander inlet temperature compared with pure fluids. However, the specific volume flow ratio of the expander is higher for zeotropic mixtures; which results in a lower economy of mixtures than pure fluids. The use of an internal heat exchanger in the system improves cycle performance. Moreover, the multi-objective genetic algorithm further improves the performance of ORC and exhibits better exergetic efficiency 51–57% and 0–14.09% reduction in lower expander-specific volume flow ratio (v 6/v 5) than thermodynamically optimised ORC. |
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Keywords: | Low-grade solar heat source Organic Rankine Cycle (ORC) zeotropic mixtures internal heat exchanger (IHE) multi-objective genetic algorithm (MOGA) |
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