In gas cooler, a key component of transcritical heat pump system, CO2 is always in supercritical status. A well design gas cooler should get the full informations of supercritcal CO2 in-tube cooling heat transfer characteristic. An EES program is developed to calculate the supercritical CO2 cooling heat transfer performances based on 4 selected correlation equations. According to the results and the thermopgysical parameters of supercritical CO2, such as specific heat, density, thermal conductivity and dynamic viscosity, two region, the starting area of supercritical region and the main supercritical region, is suggested for supercritical CO2 cooling heat transfer by temperature at 80°C. In the staring area, the variations of heat transfer and other parameters are intensive, while in the main supercritical region, the variations are clined to be stable.
Heat Transfer Characteristic Analysis of Supercritical CO2 Based on Heat Current Method Combining with Entransy Dissipation
