Organic Rankine Cycle
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IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)
e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 12, Issue 1 Ver. II (Jan- Feb. 2015), PP 85-92 www.iosrjournals.org
Energy and Exergy Analysis of Organic Rankine Cycle Using Alternative Working Fluids
Deepak Tiwari1, Akhilesh Arora2, Naushad Ahmad Ansari3,*Dr.A.F.Sherwani
Abstract: The present study is based on parametric investigation in terms of thermal efficiency, exergetic efficiency and exergy destruction with the help mathematical modeling on different ORC models using different fluids. The Thermal efficiency of ORC model of Saturated, Trilateral is compared by using working fluids such as (HFO-1234yf,HFC-134a,HFC-245fa,Ethanol,Iso-pentane by varying expander inlet temperature (30- 1600C),at fixed condensation temperature(300C) assuming fixed expander isentropic efficiency ( =0.75) and fixed isentropic pump efficiency( =0.60). The Thermal efficiency as well as exergetic efficiency has been observed best for theHFO-1234yf and found nearly close with HFC-134a. HFO-1234yf has good potential for working fluid for ORC application for low to medium temperature. It has zero global warming potential (GWP), zero Ozone layer depletion (ODP) and very Low evaporation Temperature. This paper provides a basis to compare the thermal and exergetic efficiency for various working fluids and exergy destruction in various component such as Expander, Evaporator,Condenser,Pump for saturated and Trilateral cycle when used with R-1234yf as working substance.
Keywords: Organic Rankine cycle models, Energy analysis& Exergy analysis, Exergy destruction; R-1234yf, R-134a, R-245fa, Ethanol, Isopentane.
Biographical notes: Deepak Tiwari is pursuing Ph.D. From Department of Mechanical Engineering of Jamia Millia Islamia University, Delhi. His research area includes exergy analysis of thermal systems and alternative refrigerants.
Akhilesh Arora is working as an Associate Professor in the Department of Mechanical Engineering and Automation at Indira Gandhi Delhi Technological University for Women, Delhi, India. He obtained his PhD from the Indian Institute of Technology, Delhi in 2011. His research area includes alternate refrigerants, alternate refrigeration technologies and exergy analysis of thermal systems.
Naushad Ahmad Ansari is working as an Assistant Professor in Department of Mechanical Engineering at Delhi Technological University, Delhi. He obtained his Master of Technology (M. Tech) in Thermal Engineering from Aligarh Muslim University, Aligarh in 2000. His research area includes alternate refrigeration technologies, exergy analysis of thermal systems, fluid mechanics and computational fluid dynamics.
Dr. A.F.Sherwani is working as an Assistant Professor in Department of Mechanical Engineering of Jamia Millia Islamia University, Delhi. His research area includes alternate refrigeration technologies, exergy analysis of thermal systems and renewable, sustainable energy and life cycle analysis.
Heat is recovered by organic Rankine cycles (ORC).Low grade heat is useful for operation of Organic Rankine cycle the Low grade heat is available from various heat sources such as solar ,ocean , thermal , geothermal, biomass, and available source of heat from engine exhaust or industrial process waste heat. The word ORC has been used from the fact that it is basically a Rankine cycle which runs organic Fluid as a working substance Serrano et al.  did the theoretical investigation and has suggested that possibility to introduce the concept of recovery of waste heat in heavy duty diesel engine of two stage turbocharged engine and introduced the best use of IC engine Exhaust waste heat coupling with simple water Rankine cycle. Wang.et al.  Proposed and designed a experimental set up of solar operated rankine cycle by using R-245fa as a working substance and used evacuated and Flat plate collector and found the efficiency of overall power generation of evacuated collector is 4.2% and with flat plate collector is 3.2%. DiGenova et al.  proposed a customized organic Rankine cycle based on the heat source from Fischer Tropsch plant reactor and found that the steam Rankine cycle may achieve 20.6% conversion efficiency using this heat source and by using hexane as a working substance in ORC the conversion efficiency may reach 20.6%. Wang et al.  proposed the concept of discontinuous waste heat recovery at low temperature and did the performance analysis with the effect of temperature at exit to the heat source on thermal efficiency, power consumption ,mass flow rate,expander outlet temperature, net power output,cycle irreversibility,exergy efficiency by using various working substances such as acetone,butane,isopentane,pentane,R-245fa,CF3l,R-414b,R-21 and found acetone shows the least exergy destruction and R-245fa shows maximum thermal efficiency at fixed pinch point temperature difference. Larjola  suggested the applicability of high speed (ORC) and found that the low temperature waste heat
DOI: 10.9790/1684-12128592 www.iosrjournals.org 85 | Page
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