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research-article

A generalized pinch point design methodology of organic Rankine cycle for maximum heat recovery

[+] Author and Article Information
Jahar Sarkar

Department of Mechanical Engineering, Indian Institute of Technology (B.H.U.), Varanasi, UP 221005, India
jsarkar.mec@itbhu.ac.in

1Corresponding author.

ASME doi:10.1115/1.4038963 History: Received July 12, 2017; Revised December 29, 2017

Abstract

A novel methodology for pinch point design and optimization of subcritical and supercritical organic Rankine cycles is proposed for maximum heat recovery. The presented algorithm can predict pinch point locations in both evaporator/gas heater and condenser, and optimize working fluid mass flow rate to get maximum net work output or heat recovery efficiency for given heating fluid and cooling fluid inlet conditions using selected working fluids. Proposed method is also compared with other pinch point methods of Rankine cycle available in the literature. Working fluids have been selected based on thermodynamic and environmental criteria and compared based on various performance parameters (net work output, thermal efficiency, heat recovery efficiency, irreversibility, exergetic efficiency, turbine size parameter and heat transfer requirement). The present method seems to be better than previous pinch point design methods as it optimizes the cycle by considering both source and sink. At optimum operation, ammonia is best in terms of lower mass flow rate requirement, higher exergetic efficiency, lower turbine staging and turbine size, whereas, isopentane is best in terms of higher power output and waste heat recovery efficiency. Contour plots are presented as well to select optimum ORC design parameters for available heat source and sink.

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