超临界CO2对流换热特性试验研究进展

A Review on Experimental Studies of Convection Heat Transfer Characteristic of Supercritical CO2

超临界CO2具有特殊的热力学性质和良好的传热特性,因此广泛应用于制冷空调以及其他工业领域。在超临界压力下临界区附近CO2的热物理参数随温度变化非常剧烈,这种特殊的物理性质决定了其独特的换热特性。目前各国学者对超临界CO2的换热特性做了广泛的研究工作,为了对超临界CO2的换热特性有更加深入的了解,对不同管道在冷却和加热条件下超临界CO2换热特性的试验研究进行了综述,归纳了近几年国内外学者提出的新的超临界CO2换热关联式,可为设计高效的气体冷却器提供必要的理论基础。

Supercritical CO2 is widely used in refrigeration and air conditioning systems and other industrial fields because of its special thermodynamic properties and good heat transfer characteristics.The thermophysical parameters of CO2 in the vicinity of the critical region change drastically with temperature under supercritical pressure.Such special thermodynamic properties determine its unique heat transfer characteristics.The extensive studies on the heat transfer characteristics of supercritical CO2 were investigated by scholars in the world.In order to have a deep insight into the heat transfer characteristics of supercritical CO2,the experiments on the heat transfer characteristics of supercritical CO2 under cooling and heating conditions of different pipelines were reviewed.The new heat exchange correlation of supercritical CO2 was summarized in order to provide necessary theoretical basis for design of high-efficiency gas coolers.