Integrated Analysis of Geothermal Reservoir and Binary Power Cycle System

Nishith B. Desai*, Ivanka M. Orozova-Bekkevold, Frederik Lomholt Christensen, Fredrik Haglind

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

The binary power cycle technology with an organic Rankine cycle is suitable for the utilization of geothermal resources with low to medium temperatures (up to about 150 °C). In order to accurately predict the techno-economic viability of geothermal power plants, it is necessary to consider not only the organic Rankine cycle systems’ performance parameters, but also the characteristics of the geothermal reservoir. In this paper an integrated analysis of the geothermal reservoir characteristics and binary power cycle system is presented, considering the degradation of the reservoir properties with time. Furthermore, a method to determine the techno-economically optimum value, represented by the minimum levelized cost of energy, of design power output of a binary power system for a given reservoir is proposed. The open source code Geothermal Reinjection Lifetime Prediction (GEOREPR) was used to predict the reservoir’s lifetime taking into account both the reservoir characteristics and operational parameters, such as the injectivity index. The latter is a measure of the flow rate of the injected fluid at a given pressure. Alternations in the reservoir fluid density, its dynamic viscosity and salinity due to injection induced temperature changes were incorporated in the assessment of the geothermal brine mass flow rate. Two scenarios were considered for the binary power cycle system: (i) no degradation with time of the geothermal reservoir properties, and (ii) degradation of the geothermal reservoir properties due to progressive cooling of the geothermal reservoir and related changes in reservoir fluid density, dynamic viscosity and salinity. The results suggest that the levelized cost of electricity for a case with reservoir degradation is about 18 % – 19 % higher than that for the case with no degradation. For a given case study, the techno-economically optimum value of the design power output for the binary power cycle system is at year-11 considering a plant lifetime of 30 years.
Original languageEnglish
Title of host publicationProceedings of ECOS 2024 - The 37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems 2024
PublisherECOS
Publication date2024
Pages1422-1432
Article number197
DOIs
Publication statusPublished - 2024
Event37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - Rodos Palace, Rhodes, Greece
Duration: 30 Jun 20245 Jul 2024

Conference

Conference37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
LocationRodos Palace
Country/TerritoryGreece
CityRhodes
Period30/06/202405/07/2024

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