不凝气体对二氧化碳换热性能影响研究

In this paper, some characteristics of thermodynamic properties and flow boiling heat transfer are analyzed in trans-critical carbon dioxide refrigeration system. Non-condensable gas in subcritical CO2 leads to heterogeneous nucleating process in liquid, and accelerates the phase change process. Those can change threshold of nucleation and the condition. And the influence of non-condensable gas on heat transfer performance of carbon dioxide is analyzed by classic heat transfer correlation. The paper provides theoretical basis for enhancing heat transfer in trans-critical carbon dioxide refrigeration system.