Uncertainty analysis during vapor flow inside MPE microchannels
Jéferson Diehl de Oliveira1; Guilherme Piazza Zanette1; Polyana Werncke Coan1; Júlio César Passos1; Saulo Güths1; Jacqueline Biancon Copetti2
1 UFSC; 2 UNISINOS
doi:10.20906/CPS/COB-2015-1495
Resumo
This paper reports a study about uncertainties related to condensing in microchannels of fluid refrigerant R134a. Heat exchangers involving these microchannels are more efficient than conventional ones, in addition to having reduced use of refrigerant. The main goal of this study was to analyze the experimental uncertainty in the results of the heat transfer coefficient obtained during the condensation tests in microchannel. These tests were performed with mass flow ranging from 154 < G <307.9 kg / m2s, vapor quality ranging between 0.97 < x <1, heat flux between 18.3 < q'' < 27.65 kW/m2 and saturation pressure from 6.8 to 9.6 bar. The extended uncertainty presented for the values of heat transfer coefficient was U (h) = ± 8%. Then, this result was compared to the uncertainty of results demonstrated in similar works by other authors.
Palavras-chave: Uncertainty analysis; Condensation; R-134a; MPE; Heat transfer