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Generating water steam by solar energy is a significant process for manyfields. In this paper, a low-cost high-efficiency wick type steam generator isproposed. It's based on the heat localization and thin-film evaporation. Themeasurements show that the energy efficiency is 84 % at 1 kw/m2. Besides, thedependence of efficiency on particle concentration and size are discussed. Theoptimal particle concentration is found at 60 g/m2, and a smaller particle sizegives higher efficiency. The experimental results agree well with thetheoretical prediction based on thin-film evaporation theory. Our study offersa new in-depth understanding of low-cost high-efficiency solar steamgeneration.

Low-cost high-efficiency solar steam generation by wick material with graphite micro/nano particles