Resumo

ITUNA-YUDONAGO, J.F.  e  BELMAN-FLORES, J.M.. Thermophysical properties of R744 in supercritical region during the startup of gas cooling process. Rev. Mex. Ing. Quím [online]. 2015, vol.14, n.1, pp.213-229. ISSN 1665-2738.

In this paper, the thermophysical properties of carbon dioxide (R744) in supercritical region during the startup of gas cooling process were widely investigated in a horizontal hairpin gas cooler. The dynamic model was discretized by the fully implicit finite volume method. The thermophysical properties were evaluated through the REFPROP dynamic libraries linked to Matlab. The results showed that, the thermophysical properties of R744 are characterized by large variations along the gas cooler during the transient period. In the pseudo-critical region, the behavior of the specific heat, thermal conductivity, density and dynamic viscosity is characterized by an instantaneous change in the amplitude. The specific heat is the property most affected by the transient phenomenon in the gas cooler. Its behavior has a great impact on the local heat transfer coefficient of R744.

Palavras-chave : gas cooler; carbon dioxide; thermophysical properties; transient phenomenon; transcritical system.