Open-Cycle Absorption Solar Cooling. Part 2. Heat and Mass Transfer Analysis for Glazed Collector/Regeneration. Final Report

摘要

A two-dimensional analysis of steady laminar natural convection in an open ended parallel plate channel is presented for combined heat and mass transfer. Symmetric and asymmetric boundary conditions of uniform wall temperature and concentration (UWT/C) and uniform heat and mass flux (UH/MF) are considered for both aiding and opposing buoyancy due to mass transfer. The numerical method is then applied to model a glazed collector/regenerator component of an open-cycle solar absorption refrigeration system. The solution is coupled to an energy and mass balance on a thin film absorbent flow along one wall. The results indicate that the influence of glazing height is small if the flow is between the fully developed and single plate limits. The glazed collector/regenerator water evaporation rate is higher relative to the unglazed case because the reduction in convective and radiative heat losses increase the absorbent temperature and vapor pressure sufficiently to overcome the concomitant reduction in the mass transfer coefficient. (ERA citation 11:047419)