US Patent 9259667 Modular humidification-dehumidification apparatus for concentrating solutions

A modular humidification-dehumidification (HDH) apparatus and system for concentrating a solution including a plurality of internal modules coupled to each other. The plurality of internal modules includes a humidification module and a dehumidification module in gas flow communication with the humidification module. The humidification module includes humidification media facilitating evaporation of liquid from the solution to gas as the solution passes through the humidification media thereby producing a concentrated solution and a humidified gas. The dehumidification module includes a condensing heat exchanger for condensing vapor from the humidified gas.