In the quest for sustainable energy solutions, researchers have long been exploring the potential of geothermal power. A recent study published in the journal, ‘Advances in Engineering and Intelligence Systems’, or ‘Tiến bội kỹ thuật và hệ thống trí tuệ’ in English, offers a compelling advancement in this field. Led by Arivalagan Pugazhendhi from the Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh, Vietnam, the research combines a geothermal system with an organic Rankine cycle (ORC) using a zeotropic working fluid. The results are nothing short of impressive, with the potential to significantly impact the energy sector.
The study focuses on a double-pressure flash-binary geothermal power system, a configuration that has shown promise in enhancing energy output and efficiency. By integrating an ORC with a zeotropic mixture, the system not only boosts power generation but also improves overall efficiency. The findings reveal that the system can generate a net power of 3083 kW with an exergy efficiency of 64.79% and a payback period of just 3.51 years. These numbers are a testament to the potential of this technology in making geothermal energy more commercially viable.
Pugazhendhi explains, “The vapor generator’s evaporation temperature has the highest effect on the system exergy destruction. This means that by carefully controlling this parameter, we can significantly improve the system’s performance.” This insight is crucial for optimizing geothermal power plants, highlighting the need for precise engineering and control mechanisms.
The study also delves into the economic aspects of the system, calculating the net present value for various geofluid and electricity costs. The results are intriguing: a 33% increase in electricity sale costs can boost net profit by about 78.29%, while a 38.4% increase in geofluid prices can reduce net profit by about 19.5%. This financial analysis underscores the importance of market dynamics in the viability of geothermal projects. “Understanding these cost variations,” Pugazhendhi notes, “can help stakeholders make informed decisions and optimize their investments.”
The research employs two multi-objective optimization scenarios to balance energy efficiency with the payback period and exergy efficiency with the payback period. The optimization results are promising, with the first scenario achieving 20.63% energy efficiency and a 3.58 years payback period, and the second scenario reaching 65.53% exergy efficiency with a 3.47 years payback period. These findings illustrate the potential for substantial improvements in both operational efficiency and economic returns.
The implications of this research are far-reaching. As the world seeks to reduce greenhouse gas emissions and combat global warming, geothermal energy offers a clean and sustainable alternative. By optimizing geothermal systems with advanced thermodynamic and thermoeconomic analyses, researchers like Pugazhendhi are paving the way for more efficient and cost-effective energy solutions. The insights from this study could shape future developments in the field, driving innovation and making geothermal energy a more attractive option for investors and policymakers alike. This research not only contributes to the scientific community but also provides a roadmap for the energy sector to transition towards a more sustainable future.
