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It is introduced a solar desalination process using air humidification and dehumidification. In order to increase the output of freshwater, multi-technologies are adopted, the double-pass solar air heater and tubular solar collector are used to heat the air and seawater respectively. The air is humidified by bubbling in the seawater pool, and dehumidified in the inorganic heat pipe condenser. Moreover, the heat transfer performance of the solar air heater with double vacuum glass-covers and double air passes is analyzed, and the theoretical model of its heat transfer and the calculating method are given. [ABSTRACT FROM AUTHOR]