Investigation of efficiency of R717 refrigerant single stage cooling system and R717/R744 refrigerant cascade cooling system

This study is an adaptation of ammonia cascade cooling systems using carbon dioxide on ice cream production machines and includes thermodynamic analysis R717/R744 refrigeration system with R717 refrigerant single-stage investigation its efficiency. As a result the analyses, COP value was 3.67, Carnot efficiency 0.57, second law 0.19 power required to operate compressor 27.55 kW. In system, 4.46, 0.59 22.7 kW in high-temperature part, while measured as 14.65, 0.58 6.4 low-temperature part. For whole 3.24 were found be 0.43. When results compared, it concluded that although 0.43 points lower than when our country's climate conditions thermophysical properties gas considered together, one most suitable designs system.