World Geothermal Congress 2020+1
March - October, 2021

Exergo-Economic and Exergo-Environmental Analysis of an ORC for a Geothermal Application


[University of Florence, Italy]

Novel geothermal power plant concepts have been flourished in the last years, due to the issues related to environmental concerns and particularly to the emission of Non-Condensable Gases (NCGs). Total rejection is one of the innovative solutions that are emerging. This technology is built upon the concept of closed-loop binary cycle, which exploits only the heat from the geothermal fluid and thus provide the potentiality of realization of a ‘zero-emission’ power plant. In this manuscrpt, a throughout assessment of Castelnuovo power plant case study is presented. The analysis, starting from a thermodynamic approach, is extended to include Exergy, Exergo-Economic, Life Cycle Assessment and Exergo-Environmental aspects. The analysed case study represents an innovative geothermal power plant which includes an ORC working with R1233zd(E), and a specifically designed NCGs re-compression train. The exergy, exergo-economic and exergo-environmental analyses are the optimal tools which allow identifying the components responsible for the largest inefficiency, as well as the contribution to the build-up of cost of electricity, and to the environmental cost. The calculated Levelized cost of Electricity for the case study is 7.15 c€/kWh and the obtained total environmental impact of electricity generation is 2.65 mPts/MWh.

        Topic: Power Generation Paper Number: 26089

         Session 29D: Power Generation 2 -- Equipment [Tuesday 15th June 2021, 02:00 am] (UTC-8)
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