1.4 Expected benefitsThis thesis expects to create the prototype of the system and particular data of two-stage ejector to improve conventional gas/gas ejector application and ejector refrigeration system toward energy efficiency and reduce global warming issues. The authors expect that the information provided could contribute to the idea of improving the performance of the TSE in various applications which can also contribute to the advanced field of ejector refrigeration. Further study on experimental investigation of the TSE performance and including it in the ejector refrigeration system should be carried out.