Humidification‐Dehumidification Desalination

Abstract

Humidification-dehumidification (HDH) desalination involves vaporizing water from a saline liquid stream into a carrier gas stream and then condensing the vapor to form purified water. This chapter describes various forms of the HDH cycle, with analysis of the energy consumption of various realizations of the process. The use of mass extraction/injection to improve performance is discussed. Analyses using both fixed component effectiveness and fixed component size are considered. Bubble column dehumidifiers are described, and the effect of very high feed salinity on energy and efficiency is discussed.