Abstract
A numerical analysis on simultaneous heat and mass transfer for ammonia-water air-conditioning with a vertical falling-film type of absorber and generator was performed by the one-dimensional difference method which takes into account only the change of flow direction. In the calculation, the geometries of absorber/generator and the temperature conditions were taken like as those in our previous works for water-lithium bromide system. Therefore, the liquid and vapor concentrations ranged 53-55 and 99-l00mass%NH3, respectively. The ratio of the liquid mass flow rate to the vapor mass flow rate, L/V, ranged up to 18000.
For these thermal conditions, it was found that the vapor-phase mass transfer resistance is negligibly small, and the absorption/generation rates are almost constant regardless of the vapor flow rate, but increase with increasing liquid flow rate. It was also found that the calculated values of heat fluxes in the absorber/generator for ammonia-water system are equivalent or superior to those for water-lithium bromide system.
