The Impact of Soil Hydrothermal Properties on Geothermal Power Generation (GPG): Modeling and Analysis

Geothermal power plants have become the main application that utilizes geothermal energy. The utilization of deep geothermal energy adheres great importance to the soil condition. One of the biggest challenges faced by geothermal power plant designers is to reduce the risk of soil exploration. To solve this problem, forecasting by modeling has proven to be an important tool to address the problem. In this research, a geo-model was established by modeling three geological layers with different hydraulic and thermal properties to solve the above dilemma. The layers, elevation, and fault zones were simulated using interpolation functions from an artificial dataset. The coupled porous media flow and heat transfer problem using Darcy’s law, as well as heat transfer in porous media interfaces, were studied. The evolution of the flow field, hydrothermal performance, and temperature gradient were also analyzed for a period of 10 years. The results showed the recoverable thermal energy area gradually moved downwards during the 10-year simulation time. When the distance between the recharge well and the production well exceeded 200 m, the collection efficiency was significantly decreased. After 5 years of extraction, the power generation efficiency of the heat source will be less than 9.75%. These results effectively avoided the exploration cost of geothermal power plant site selection, which is significant for the efficiency improvement of geothermal energy.

Konservasi Energi Panas Sisa Proses Geothermal Power Plant

Kemajuan pesat teknologi berbanding lurus dengan kebutuhan akan energi listrik namun tidak sejalan dengan ketersedian sumberdaya penghasil energi listrik tersebut, untuk itu diperlukan konservasi energi untuk meningkatkan efisiensi dan optimalisasi dari sebuah pembangkit listrik sehingga dapat menunjang peningkatan kebutuhan akan energi listrik. jurnal ini memberikan analisa kelayakan pemanfaatan energi panas sisa proses dari pembangkit listrik geothermal yang menjadi pembangkit utama, Dengan menggunakan System Organic Rankine Cycle (ORC) dengan fluida kerja Iso-Butene, dengan cara menghitung heat balance dari siklus ORC, hingga didapatkan nilai enthalpi dan entropy dari system tersebut sehingga dapat dihitung energi yang dapat dihasilkan oleh turbin ekspansi yang menggerakan Generator, dengan hasil akhir ini tambahan energi yang dihasilkan oleh system ORC

Toxic element concentrations in lichen Platismatia interrupta around the geothermal power station on Kunashir Island

The results of the study of the gross content of 14 chemical elements in lichen Platismatia interrupta collected around the geothermal power station “Mendeleevskaya” on Kunashir Island are presented. The highest exceedance was noted for As in the research area. The gross content of As varies from 0.8–2.6 mg/kg in control areas and up to 5–9 mg/kg in the impact zone, i.e. the maximum excess in lichen is noted by 11.6 times. For other elements, there were no strong exceedances in the impact zone compared to the control areas. According to the results of regression analysis, a statistically reliable inverse exponential relationship between the content of As and the distance to the power station (adjusted R2: 0.86, p-value: 0.001) is traced. The average value of the enrichment coefficient for As exceeds 100, which indicates the non-substrate origin of this element.