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CO2-based enhanced geothermal systems (EGS) are being widely studied due to great heat extraction and additional CO2 sequestration. However, the existing studies ignored surrounding formation permeability and approximately calculated CO2 sequestration based on flow tests of water-based EGS. In this paper, heat extraction and CO2 sequestration in a CO2-based EGS were simulated simultaneously based...
Wind turbine blade design is a complicated multi-objective optimization task. In this article, a novel gradient-based multi-objective evolution algorithm based on both uniform decomposition and differential evolution is proposed for the design of wind turbine blades, to overcome unsatisfactory convergence performance and diversity of solutions usually existing in conventional evolution algorithms...
A three-dimensional thermal-hydrologic model considering water losses was developed to simulate heat extraction from an enhanced geothermal system (EGS), consisting of an injection well, a production well, a reservoir and the surrounding formation. The model was verified by application to Fenton Hill EGS. Based on the model, the influences of some factors on heat extraction were analyzed. As surrounding...
Using abandoned oil wells for geothermal power generation can relieve energy problem, save drilling cost, and govern the pollution caused by the residual oil of the abandoned oil wells. In this paper, a novel method for enhancing the geothermal utilization efficiency by developing thermal reservoirs is presented. A 2-D thermal reservoirs coupling with 1-D wellbore heat transfer model was set up to...
Formation and reservoir of steam injection well thermal properties are important parameters for evaluating thermal efficiency of thermal recovery process. Oil saturation of reservoir is also a crucial criterion for evaluating exploitation value of oil field. This study firstly presents a layered inversion method for estimating the spatial distributions of formation and reservoir thermal properties...
In this paper, abandoned “dry hole” oil wells are simulated as a source of geothermal power for generating electricity. Isobutane is chosen as the working fluid. It is heated by the geothermal energy from geologic formation and drives the turbine to generate electricity. A model based on transient formation heat transfer is presented. Furthermore, a numerical simulation for an abandoned well with...
Oil reservoir thermal properties not only play an important role in steam injection well heat transfer, but also are the basic parameters for evaluating the oil saturation in reservoir. In this study, for estimating reservoir thermal properties, a novel heat and mass transfer model of steam injection well was established at first, this model made full analysis on the wellbore-reservoir heat and mass...
As the practical load conditions vary with time, the performance of micro combined cooling heating and power (micro-CCHP) system depends a lot on the operation strategy. So, it is significant to study the system performance and find the optimal operation strategies for various load conditions. There are many devices can be considered in micro-CCHP system. In this study, a comprehensive micro-CCHP...
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