A number of studies have been carried out on different types of regenerators, such as solar collector/regenerator [1-3], plate type [4-6] and packed bed type [7-9]. Liu [10], who studied hot air driven and hot desiccant driven regenerators, states that the desiccant solution should be heated as a first priority then air as a consequence. However, he explains that a hot air driven regenerator has better mass transfer in parallel flow while hot desiccant regenerator is better in counter flow. Saman et al. [11] and Ren et al. [12] studied a hot water driven regenerator. Yin et al. [13] indicated that the regeneration efficiency of an internally-heated regenerator is higher than the adiabatic regenerator.