Modeling and experimental investigation on a direct steam generation solar collector with flat plate thermal concentration

Abstract

Currently, steam generation using solar energy mostly relies on optical concentration, which is a costly system, to generate the high temperature needed for water evaporation. Here, the development of a low-cost and scalable approach based on thermal concentration for solar steam generation is reported. The system was demonstrated to be capable of generating 100–120°C steam under ambient air conditions without optical concentration. A solar thermal efficiency could be achieved up to 13% at an average solar irradiance of only 670 W m−2. The new solar steam generation system, with its simple structure, great effectiveness, and low cost, holds the promise of significantly expanding the application domain of solar thermal systems.