Solar-driven multi-generation system: Thermoeconomic and environmental optimization for power, cooling, and liquefied hydrogen production

Abstract

This study explores the utilization of solar energy to power an integrated energy system that includes power, cooling, and liquefied hydrogen production. The proposed system undergoes a thorough evaluation from three essential perspectives: thermodynamics, economics, and environmental. Additionally, a sensitivity analysis is conducted to gain insights into the operational dynamics. Furthermore, an optimization process is implemented to attain the optimal sate. The findings reveal a net power production of 13.45 MW, a cooling production rate of 3.41 MW, and a liquefied hydrogen production rate of 27.3 kg/h. These production rates are associated with cost and exergoenvironmental impact rates of 1280.9 $/h and 122.04 Pt/h, respectively, resulting in a payback period of 6.04 years at the baseline. An increase in the electrolyzer input power from 5 % to 15 % of the total power production enhances the liquefied hydrogen production from 14.84 to 41.2 kg/h. However, this increment leads to a reduction in exergy efficiency from 9.27 % to 8.78 % due to a decrement in net power. The optimal state yields net power and liquefied hydrogen rates of 14.03 MW and 33.53 kg/h, respectively. This state results in an increased products cost rate of 1301.85 $/h but reduces the payback period to 5.77 years.