Vapour compression distillation incorporating multi-phase water ejector

This study considers a mathematical model for a single effect, thermo vapourcompression desalination unit that utilizes high pressurized water ejector.The model developed has been used to investigate the performance of a singleeffect water ejector vapour compression unit under different operating conditions.Many parameters have been considered in this study, the geometry of the ejector, thestate of motive water, evaporator temperature, temperature DROP across the evaporatorand pressure loss.In this analysis the effect of the above parameters on the streams propertiesinside the ejector is obtained, such as, the entropy creation across ejector, minimummixing temperature inside ejector mixing section, motive water to product flow ratio,and specific energy required for such system.This study has been also extended to include the steam ejector system. Similarto water ejector, the different parameters affecting the performance of the steamejector are studied.A comparison is done between the water ejector, and steam ejector to studytheir performance under the same operating conditions and geometry.It was found that the water ejector is superior to steam ejector in terms oflower energy consumption per unit product, in addition to utilizing water instead oflive steam which could be very beneficial specially in remote areas where a steamsource would be difficult to obtain.