Abstarct: This thesis analyzes the energy, exergy, and economic aspects of a combined ejector refrigeration-solar and Stirling engine system. In today's world, the need for sustainable and efficient energy systems is strongly felt, and due to the limitations of fossil resources and the pollution caused by their use, the adoption of clean and renewable energy as a primary energy source emerges as a suitable solution. In this research, the modeling of the operational principles of an ejector refrigeration system, a Stirling engine, and a solar collector is initially performed using EES software, after which the combination of these systems is analyzed. Energy analysis examines the amount of input and output energy of the system, while exergy analysis helps identify and reduce energy losses in processes. Finally, economic analysis evaluates the investment costs and the payback period of the system, contributing to assessing the economic viability of this combined system. The results of this research indicate that the overall energy efficiency of the system is, on average, 40%, and the overall exergy efficiency of the system is, on average, 30%. From an economic perspective, the system can also be considered a sustainable and economically viable solution for meeting power and cooling needs in areas with solar radiation and a payback period of less than 8 years.