Exergo-economic and exergo-environmental assessment of two large CHP geothermal power plants

Manfrida, Giampaolo; Talluri, Lorenzo; Ungar, Pietro; Zuffi, Claudio; Díaz-Ramírez, Maryori C.; Leiva, Héctor; Mainar-Toledo, María Dolores; Jokull, Snorri

doi:10.1016/j.geothermics.2023.102758

Cited by 4 publications

(6 citation statements)

References 27 publications

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“…Similarly, the relative difference rk in economic cost between the product and fuel flags a notable increase in cost across the component (12). An extensive description of this methodological approach can be found in [20]. The Exergo-Environmental Analysis (EEvA) [21,22] employs ana pproach similar to that of Exergo-Economic Analysis, but replaces conceptually economic costs with a singular indicator of the component environmental performance.…”

Section: Exergo-economic and Exergo-environmental Analysismentioning

confidence: 99%

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Qualtra Geothermal Power Plant: Life Cycle, Exergo-Economic and Exergo-Environmental Preliminary Assessment

Zuffi,

Ungar,

Fiaschi

et al. 2024

Preprint

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Qualtra, an innovative 10 MW geothermal power plant proposal, employs a closed-loop design to mitigate emissions, ensuring no direct release into the atmosphere. A thorough assessment utilizing energy and exergy analysis, Life Cycle Assessment (LCA), Exergo-economic and Exergo Environmental Analysis (EevA) was conducted. The LCA results, utilizing the ReCiPe 2016 midpoint methodology, encompass all the spectrum of environmental indicators provided. The technology implemented makes it possible to totally avoid direct atmospheric emissions from the Qualtra plant, so the environmental impact is mainly due to indirect emissions over the life cycle. The results obtained for the Global Warming Potential indicator is about 6.6 g CO2/kWh, notably lower compared to other conventional systems. Contribution analysis reveals that the construction phase dominates, accounting for over 90% of the impact in all LCA MidPoint categories. At the component level, a single score calculation incorporating normalization and weighting was executed. The resulting single score is then used into Exergo-Environmental Analysis (EEvA), highlighting the well system as the most impactful contributor, constituting approximately 45% of the total impact. Other substantial contributions to the environmental impact include the condenser (21%), the turbine (17%), and the HEGeo (14%). The Exergo-Economic analysis assesses cost distribution across major plant components, projecting an electricity cost of about 8.3 c€/kWh.

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Section: Exergo-economic and Exergo-environmental Analysismentioning

confidence: 99%

“…This approach not only enables the identification of components with the most significant environmental impact, but also allows for the prioritization of mitigation efforts. Further insights into this methodology can be found in [20].…”

Section: ∑ 𝐶 ̇𝑃𝑒𝑘mentioning

confidence: 99%

Qualtra Geothermal Power Plant: Life Cycle, Exergo-Economic and Exergo-Environmental Preliminary Assessment

Zuffi,

Ungar,

Fiaschi

et al. 2024

Preprint

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“…This study analyses the Nesjavellir geothermal power plant (GPP) as it replicates the solution that is already implemented in the Hellishedi geothermal power plant [16,17]. The innovations applied to this power plant are Carbfix [18] and Sulfix [19], which aim to minimise the emissions of CO 2 and H 2 S, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The application of the life cycle assessment (LCA) methodology has proven to be a valuable and promising tool for conducting a comprehensive analysis of the environmental impacts of geothermal energy conversion [16,17,20]. Its utilisation has demonstrated its capability to generate quantitative results and facilitate comparisons among different types of plants and resource conditions.…”

Section: Introductionmentioning

confidence: 99%

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Environmental Impact Assessment of Nesjavellir Geothermal Power Plant for Heat and Electricity Production

Mainar-Toledo,

Díaz-Ramírez,

Egilsson

et al. 2023

Sustainability

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This work is focused on presenting the main results and discussions concerning the environmental benefits of reducing the non-condensable gases emitted from the Nesjavellir geothermal power plant. The primary objective of this study is to conduct a life cycle evaluation to analyse the overall environmental benefit effects of producing 1 kWh of electricity and 1 kWh of thermal energy in the geothermal power plant at Nesjavellir, which is located in Iceland. The assessment is performed both before and after implementing an abatement system designed to reduce CO2 and H2S gases. The production of geothermal energy is increasing every year and, therefore, it is crucial to identify and quantify the key environmental factors of producing this type of energy and improvements for the future energy transition of the energy generation sector. Firstly, the results show that the environmental impact of electricity production is higher compared to heat production. More in detail, the emissions due to the nature of the geothermal fluid and the construction phase represent the most relevant environmental load for both electricity and heat production for nearly all the 18 environmental impact indicators studied. Furthermore, considering the abatement system for the non-condensable gas emissions, reductions of 78% and 60% in global warming potential is achieved for a production of 1 kWh of electricity and 1 kWh of thermal energy. In terms of external environmental costs, the implementation of an abatement system results in a reduction exceeding 95% for both electricity and thermal energy production per kilowatt-hour. The outcomes obtained from both the baseline scenario and the application of the abatement system undeniably prove that the latter results in a substantial decrease in the overall environmental impacts linked to the generation of 1 kWh of electricity and 1 kWh of heat, encompassing a notable reduction in external environmental costs (externalities).

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Multicriteria approach for evaluating biowaste-valorization cases

Díaz,

Laborda

et al. 2024

Energy Storage and Saving

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Exergo-economic and exergo-environmental assessment of two large CHP geothermal power plants

Cited by 4 publications

References 27 publications

Qualtra Geothermal Power Plant: Life Cycle, Exergo-Economic and Exergo-Environmental Preliminary Assessment

Qualtra Geothermal Power Plant: Life Cycle, Exergo-Economic and Exergo-Environmental Preliminary Assessment

Environmental Impact Assessment of Nesjavellir Geothermal Power Plant for Heat and Electricity Production

Multicriteria approach for evaluating biowaste-valorization cases

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