Energy optimization is performed on hybrid solar-geothermal power plant working according to Organic Rankine Cycle and installed in southern Tunisia. The performances of four different configurations of the power plant are studied. Mass and energy balances are established for the different compounds. The effects of the main operating parameters such as the geothermal water temperature, ambient temperature and direct normal irradiation on the power plant performances are analyzed. A code is established using Engineering Equation Solver software (EES) to perform the required calculations. Obtained results show that the hybrid solar-geothermal power plant with a heat recovery system is the most suitable configuration design giving a better overall energy efficiency of 15.77 and13.11% and a maximum net power of 1089 and 1882 kW in winter and summer, respectively. However, in the summer season, using a heat recovery system can valuable only when the water temperature is higher than 66°C. For air-cooled condenser, the suitable condensing pressure is 1 bar in winter and 1.9 bars in summer.

能源优化是根据有机朗肯循环并安装在突尼斯南部的混合太阳能地热发电厂进行的。研究了电厂的四种不同配置的性能。建立了不同化合物的质量和能量平衡。分析了地热水温度，环境温度和直接正常辐射等主要运行参数对电厂性能的影响。使用工程方程求解器软件（EES）建立代码以执行所需的计算。获得的结果表明，具有热回收系统的混合太阳能-地热发电厂是最合适的配置设计，在冬季和夏季，整体能源效率更高，分别为15.77和13.11％，最大净功率为1089和1882 kW，分别。但是，在夏季，仅当水温高于66°C时，使用热回收系统才有价值。对于风冷冷凝器，合适的冷凝压力在冬天为1 bar，夏天为1.9 bar。