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

Guzović, Zvonimir; Majcen, Boris; Cvetković, Svetislav

doi:10.1016/j.apenergy.2012.03.064

Cited by 52 publications

(21 citation statements)

References 13 publications

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“…In both cases, the decrease of ammonia concentration has a positive effect on plant performances. These results are in agreement with a similar investigation performed by two co-authors in this paper; thus, for a detailed explanation and physical meaning of the results, the readers are referred to [79,80].…”

Section: Parametric Analysis Of Orc and Kln Plantsupporting

confidence: 92%

Performance analysis of electricity generation by the medium temperature geothermal resources: Velika Ciglena case study

Rašković

Guzović

Cvetković

2013

Energy

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a b s t r a c tDuring the last decade, a design of an energy efficient and cost effective geothermal plant represents a significant and on-going technical challenge in all the Western Balkan countries. In the Republic of Croatia, the geothermal field Velika Ciglena is identified as one of the most valuable geothermal heat sources and probably the location where the first geothermal plant in the Western Balkan area will be built. The purpose of this work is the conceptual design and performance analysis of the binary plants ethe one which operates under the Organic Rankine Cycle (ORC) and the other under Kalina (KLN) cycleewhich can be used for geothermal energy utilization in Velika Ciglena. A conceptual plant design is performed by the equation-oriented modelling approach and supported by the two steady-state spreadsheet simulators. The performance analysis of all design solutions is conducted through energy and exergy analysis, and by the estimated total cost of operating units in the plant. The results of the analysis indicate that the plant design based on the ORC cycle has a higher thermodynamic efficiency and lower cost of equipment, and consequently, it is more suitable for the future geothermal plant in Velika Ciglena.

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Section: Parametric Analysis Of Orc and Kln Plantsupporting

confidence: 92%

Performance analysis of electricity generation by the medium temperature geothermal resources: Velika Ciglena case study

Rašković

Guzović

Cvetković

2013

Energy

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“…However, the formation heat transfer was ignored in these studies. Guzovic et al (2012) analyzed a binary plant running with ORC or Kalina cycle, applying medium-temperature geothermal fluid in Croatia for electricity production. They concluded that ORC had better thermal efficiency in case of low-temperature geothermal source (below 140°C).…”

Section: Introductionmentioning

confidence: 99%

Simulation of Power Production from Dry Geothermal Well Using Down-hole Heat Exchanger in Sabalan Field, Northwest Iran

2015

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In this research, a simulation was performed for evaluating power production from an abandoned geothermal well as an enhanced geothermal system by injecting a secondary fluid. Abandoned wells, due to lack of fluid or very low transmissivity, are regarded among the low-to moderate-temperature resources that have the potential for heat production without any cost for deep drilling. Accordingly, they are taken as suitable sources of energy. In the present paper, an abandoned geothermal well at Meshkinshahr geothermal field in Sabalan district, northwestern Iran, with 3176 m depth was simulated. The bottom-hole temperature of 148°C, as well as well casing size, and real thermal gradient for well were applied in the model. A 3D heat transfer simulation model was designed by considering a coaxial pipe as a down-hole heat exchanger between surrounding rocks of the well and injected fluid. Injected fluid to the well with specified pressure and temperature receives heat from rocks surrounding the well, until it reaches the bottom of the well and converts to vapor. The vapor returns to the surface from inner pipe with very low heat loss during its return. The inner pipe is isolated by a thin layer having a low heat conductivity to prevent heat loss from the returned fluid. It was observed that obtained heat in the well depends on temperature profile of the well, injection velocity, and fluid mass flow rate. The model results were optimized by selecting suitable parameters such as inlet injection speed and fluid flow rate to achieve the highest temperature of the fluid returned from the well. A binary power plant was also modeled to determine the extractable power using returned fluid as input using ammonia and isobutene, as working fluids in binary cycle. Finally, electric power of 270 kW was generated from well NWS3 using designed down-hole heat exchanger.

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“…Guzović et al [6] showed a comparison between the ORC and the Kalina cycle based on energy analysis results for a mediumtemperature geothermal source with a relatively low temperature (140°C). ORC shows a better thermal efficiency: 13.5 vs. 12.8% (and accordingly higher net power: 2225.5 vs. 2101.4 kW).…”

Section: Nomenclaturementioning

confidence: 99%

Energy and economic analysis of geothermal–solar trigeneration systems: A case study for a hotel building in Ischia

et al. 2015

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

Cited by 52 publications

References 13 publications

Performance analysis of electricity generation by the medium temperature geothermal resources: Velika Ciglena case study

Performance analysis of electricity generation by the medium temperature geothermal resources: Velika Ciglena case study

Simulation of Power Production from Dry Geothermal Well Using Down-hole Heat Exchanger in Sabalan Field, Northwest Iran

Energy and economic analysis of geothermal–solar trigeneration systems: A case study for a hotel building in Ischia

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