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Pre-Print Version Exergy and Exergoeconomic Analyses and Optimization of Geothermal Organic Rankine Cycle Rami Salah El-Emam a,b,*, Ibrahim Dincer a a Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario, L1H 7K4, Canada. b Faculty of Engineering, Mansoura University, Mansoura, Egypt. rami.elemam@uoit.ca Applied Thermal Engineering Volume 59, Issues 1–2, 25 September 2013, Pages 435–444 http://dx.doi.org/10.1016/j.applthermaleng.2013.06.005 Abstract : This paper presents thermodynamic and economic analyses on a novel-type geothermal regenerative organic Rankine cycle based on both energy and exergy concepts. An optimization study is also performed based on the heat exchangers total surface area parameter. Parametric studies are performed to investigate the effect of operating parameters, and their effects on the system energetic and exergetic efficiencies and economic parameters are investigated. The energy and exergy efficiency values are found to be 16.37% and 48.8%, respectively, for optimum operating conditions at a reasonable rejection temperature range of the geothermal water from 78.49oC to 116.2oC. The mass flow rates of the organic fluid, cooling water and provided geothermal water are calculated for a net out power of 5 MWe. Keywords: Exergy, exergoeconomic, optimization, efficiency, organic Rankine cycle, geothermal energy. 1. Introduction In the recent years, there has been a significant increase in the low-grade heat recovery and renewable energy market. The geothermal energy is considered one of the most reliable and relatively least-expensive source of renewable energy. To utilize this energy; organic Rankine cycle (ORC) is a promising technology for converting this energy into useful power. ORC also has the benefit of being simple in construction, system components are available, high flexibility and safety [1-4]. Considerable research has been conducted to study the performance assessment of the organic Rankine cycle that is based on geothermal energy source. Researchers studied the choice of an appropriate working fluid, optimal reinjection condition of the geothermal fluid, the ability of cogeneration and the economic analysis of such a system. One of the main challenges in the study of ORC is the choice of the working fluid and the cycle design to achieve the highest performance [5, 6]. Hettiarachichi et al. [7] studied the performance of ORC using different pure working fluids. Karellas and Schuster [8] simulated the processes of the ORC using normal and supercritical fluids, and studied the variation of the system efficiency in various applications. Badr et al. [9] studied the characteristics of ideal working fluid for an ORC operating between 120oC and 40oC. A comparative 1PDF Image | Exergoeconomic Analyses and Optimization of Geothermal ORC
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