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A closed type solar regenerator has been studied in application to regeneration with liquid desiccants. Essentially, it consists of a flat blackened, tilted surface with a transparent glazing as a covering. The absorbent solution which is to be regenerated trickles down as a thin film over the absorber and is heated by solar energy. The water vapor that evaporates from the liquid film is condensed on the under side of the glass cover and the soluation leaving the regenerator becomes strong. A simple expression is derived, to estimate the mass of water evaporated from the weak absorbent solution as a function of climatic conditions and initial conditions of the abosrbent solution. A comparison is made with a forced flow air circulation regenrator, and it was found that the closed type regenerator may be used for regeneration only in hot, humid climates.