Physical Property Calculation and Refrigeration Cycle Analysis of Mixed Refrigerant R32/R290

Abstract

The adoption of eco-friendly refrigerants in air conditioning systems is crucial for advancing low-carbon architecture. The current refrigerant R410A, with its high global warming potential, underscores the need for sustainable alternatives that balance cooling efficiency and environmental impact. This study investigates a binary mixture of R32 and R290 as a potential replacement for R410A. Using the Peng–Robinson equation of state, the thermodynamic properties of the mixed refrigerant were calculated post-temperature glide, analyzing variations across different mixing ratios. A specific ratio of 0.3:0.7 (R32:R290) was identified as optimal, offering a balance between safety and performance, closely matching R410A’s properties. Simulations of the refrigeration cycle were conducted to assess the effects of condensation and evaporation temperatures, as well as subcooling and superheating, on system performance. Key findings reveal that the 0.3:0.7 mixture not only meets safety standards for central air conditioning but also demonstrates efficiency comparable to R410A. These results provide a robust theoretical foundation for the development of low-carbon air conditioning technologies, highlighting the potential of R32/R290 mixtures in reducing environmental impact while maintaining performance.