Description Climate change and people's increased expectation of comfort will see a significant rise in the use of cooling in buildings, aircraft and surface transport in the future. Unfortunately, the refrigerants used in most cooling systems, Hydroflourocarbons (HFCs) and Hydrochlorofluorocarbons (HCFCs) have a significant global warming potential (GWP) and international agreements have been signed to phase them out. In this project you will investigate the performance of alternative refrigerant cycles using refrigerants such as Air (commonly used in aircraft refrigeration systems) and Carbon Dioxide and contrast this with current refrigerants. The project will involve the development of thermodynamic refrigeration cycle models, their verification and use of the models to compare of different cycle performances under a range of applications. The outcome should be conclusions regarding the applicability of alternative cycles and recommendations for future research. Key Objectives Review conventional and alternative refrigeration technology Develop thermodynamic models of conventional and alternative refrigeration cycles Develop a set of performance tests and performance metrics Compare performance of different cycles Produce conclusions on performance and applicability