Dynamic model of a shell-and-tube condenser. Analysis of the mean void fraction correlation influence on the model performance

摘要: Abstract A moving-boundary dynamic model of a shell-and-tube condenser is presented. Within this approach, the mean void fraction relevant parameter which obtained, in work, using different correlations proposed literature for flow pattern analyzed. In order to evaluate performance with each correlation, set experimental tests R134a as working fluid, varying main operating variables (refrigerant mass rate, secondary fluid rate and inlet temperature), are performed. The analyzed from system outputs, namely, condensing pressure refrigerant outlet temperatures. results, comparing predictions data, show great influence correlation on noticeable discrepancies depending used. It also observed that homogeneous frequently provides acceptable results all analyzed, although most appropriate depends transient characteristics.