Improving efficiency of transcritical CO2 cycles through a magnetic refrigeration subcooling system

• A new refrigeration hybrid system of CO 2 subcooled by magnetic is presented. The hybridisation evaluated at environmental temperatures from 25 to 35 °C. Operation parameters the overall are optimized. Increments up 9.0% in COP obtained. Subcooling methods for transcritical plants being studied order improve behaviour these systems hot climates, where basic configurations not competitive enough. To achieve important improvements performance, it necessary perform subcooling with a cycle working Coefficient Performance higher than that without subcooling. Magnetic devices can high values when temperature difference between sink and cold source small, therefore they meet requirements be applied as method. This work presents coupling two technologies: vapour compression magnetocaloric refrigeration, which has yet been presented literature. is, based on experimental results existing prototype, analysed semi-empirically further evaluated, method wide range ambient conditions. Gas-cooler pressure, degree operating refrigerator were optimized each condition obtain maximum Performance. We show prototype enhance 9%.