Possibilities of electricity generation in the Republic of Croatia from medium-temperature geothermal sources

Guzović, Zvonimir and Majcen, Boris and Cvetković, Svetislav (2012) Possibilities of electricity generation in the Republic of Croatia from medium-temperature geothermal sources. = Possibilities of electricity generation in the Republic of Croatia from medium-temperature geothermal sources. Applied Energy, 98. pp. 404-414. ISSN 0306-2619. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2012). .

Full text not available from this repository.
Official URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

In the Republic of Croatia, there are several sources of medium-temperature geothermal water in the range of 90-140 °C, with which it is possible to produce electricity in binary plants, either with the Organic Rankine Cycle (ORC) or with the Kalina cycle. In the literature, the Kalina cycle is viewed as more thermodynamically favourable than the ORC; i.e., the Kalina cycle has a higher thermal efficiency and produces more power. However, the Croatian experience with a medium-temperature geothermal source with the relatively high temperature of geothermal water (Velika Ciglena, 175 °C) is that the ORC is thermodynamically better than the Kalina cycle. In this paper, a comparison between the ORC and the Kalina cycle is performed based on energy analysis results for a medium-temperature geothermal source with a relatively lower temperature (Lunjkovec-Kutnjak, 140 °C). Additionally, in this case the ORC has better thermal efficiency (First Law efficiency) - 13.5 vs. 12.8 - and accordingly higher net power - 2225.5. kW vs. 2101.4. kW. This difference is explained by the relatively high average annual temperature of the cooling air in the condenser (15 °C), which has a more unfavourable influence on the condensing pressure in the Kalina cycle than in the ORC (6.35. bar vs. 0.68. bar).

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): Binary plants; Condensing pressure; Cooling air; Croatia; Croatians; Electricity generation; Energy analysis; First law efficiency; Geothermal sources; Geothermal water; High temperature; Kalina cycle; Medium temperature; Organic Rankine cycles; Thermal efficiency; Electric generators; Energy management; Geothermal power plants; Rankine cycle; Geothermal energy; condensation; electricity generation; geothermal system; high temperature; low temperature; power plant; temperature effect; thermodynamics; Croatia
Subjects: TECHNICAL SCIENCE
Divisions: 500 Department of Energy, Power Engineering and Environment > 530 Chair of Turbomachinery
Indexed in Web of Science: Yes
Indexed in Current Contents: Yes
Quartiles: Q1 (2012)
Date Deposited: 29 Apr 2015 12:46
Last Modified: 29 Feb 2016 11:47
URI: http://repozitorij.fsb.hr/id/eprint/3924

Actions (login required)

View Item View Item