Performance Analysis of a Hybrid Solar-Geothermal Power Generation System

Abstract

A medium-low temperature hybrid solar-geothermal plant (HSGP) model was established under the conditions of solar radiation intensity and ambient temperature in Lhasa, china. Based on the established MATLAB model, the net power output, thermal efficiency and exergy efficiency of the stand-alone geothermal power plant and the HGSP were calculated. The results show that the hybrid power plant has better performance than the stand-alone geothermal plant. By increasing solar energy assistance, the electricity generated by the HSGP increased by 9.4% on the summer solstice and 1.7% on the winter solstice respectively. From the perspective of exergy destruction, the loss of each part of the hybrid power generation system was analyzed and calculated, which indicates the direction for further improving the efficiency of the system. The results provide a theoretical basis for the design and performance evaluation of HSGP.