This paper presents the study of two types of air humidifiers, namely a tubular spray humidifier and a pad humidifier. These two humidifiers were studied as apart for a multiple stage solar desalination process. Comparative experimental results for the evaporation capacity of both humidifiers are presented for different operating conditions of air and seawater flow rate, air and seawater temperature and dimensions of equipment. Some results of a CFD simulation of the pad humidifier are also presented.