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Sustainability 2015, 7(11), 15262-15283; doi:10.3390/su71115262

Improving the Environmental Sustainability of Flash Geothermal Power Plants—A Case Study

Dipartimento di Ingegneria Industriale, Università degli Studi di Firenze, Viale G.B. Morgagni 40, 50134 Firenze, Italy
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Academic Editor: Tatiana Morosuk
Received: 8 October 2015 / Revised: 6 November 2015 / Accepted: 12 November 2015 / Published: 18 November 2015
(This article belongs to the Special Issue Energy Conversion System Analysis)
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Abstract

The sustainability of geothermal energy production is analyzed with reference to a production plant located in a specific area (Monte Amiata, Italy). Four solutions combining a flash power plant with an Organic Rankine Cycle in a hybrid configuration are analyzed in terms of production of electricity, exergy balance and emissions level (CO2, H2S, Hg). The different solutions correspond to increasing environmental performance, and for the most advanced case achieve near-zero emissions (complete reinjection of the natural resource, including incondensable gases). The results show that this can be achieved at the price of a progressive reduction of electrical productivity. View Full-Text
Keywords: geothermal energy conversion; sustainability; exergy analysis; organic rankine cycle geothermal energy conversion; sustainability; exergy analysis; organic rankine cycle
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bruscoli, L.; Fiaschi, D.; Manfrida, G.; Tempesti, D. Improving the Environmental Sustainability of Flash Geothermal Power Plants—A Case Study. Sustainability 2015, 7, 15262-15283.

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