ABSTRACT
The present work focuses on response surface methodology-backed thermodynamic analysis of organic Rankine cycle (ORC) driven by low-temperature heat sources (temperatures less than 150°C). The zeotropic mixture of Butane and Pentane is employed as a working fluid. Both pure fluids have zero ozone depletion potential and lower global warming potential. The second order nonlinear polynomial mathematical model was developed by RSM methodology to get the relationship between thermal efficiency of ORC and decision variables. Furthermore, the analysis of variance (ANOVA) technique was applied to get apprehend of most significant decision variables in terms of p-values and F-values. In addition, contour plots were drawn to analyze a range of decision variables in which thermal efficiency of ORC is found to be higher. The results indicate that the thermal efficiency is mostly affected by heat sink temperature, followed by isentropic efficiency of the turbine and mass fraction of zeotropic mixture.
Nomenclature
= | ORC evaporator heat input (KW) | |
= | Isentropic efficiency of pump | |
= | Isentropic efficiency of turbine | |
= | Pump Work (KW) | |
= | Turbine work (KW) | |
= | Mass flux of working fluid in ORC (kgs−1) | |
Qc | = | Cooling load on condenser (KW) |
= | Effectiveness of heat exchanger | |
MF | = | Mass fraction of zeotropic mixtures |
= | Thermal efficiency of ORC |
Abbreviation
ORC | = | Organic Rankine cycle |
OA | = | Orthogonal Array |
GWP | = | Global warming potential |
ODP | = | Ozone depletion potential |
ANOVA | = | Analysis of Variance |
RSM | = | Response surface methodology |
Additional information
Notes on contributors
Ashwni Goyal
Ashwni Goyal working as Assistant Professor in Mechanical and Automation Engineering Department of Maharaja Agrasen Institute of Technology, Delhi, India.His Research area includes low- grade heat source power generation.
Ahmad Faizan Sherwani
Ahmad Faizan Sherwani is working as an Associate Professor in Department of Mechanical Engineering of Jamia Millia Islamia University, Delhi. His research area includes Solar Energy, alternate refrigeration technologies, exergy analysis of thermal systems and renewable, sustainable energy and life cycle analysis. He has published plenty of research paper in reputed international and national journals. He has worked as reviewer in several reputed general.
Deepak Tiwari
Deepak Tiwari working as Assistant Professor in Mechanical Engineering Department of Bhagwan Parshuram Institute of Technology, Delhi, India. His research area includes low-grade solar thermal power generation.