Abstract

SALINAS-FREIRE, Henry Alberto; PEREZ-ONES, Osney  and  RODRIGUEZ-MUNOZ, Susana. Thermodinamical productivity limitations for passive solar stills. Rev. ion [online]. 2019, vol.32, n.1, pp.7-20.  Epub June 03, 2019. ISSN 0120-100X.  https://doi.org/10.18273/revion.v32n1-2019001.

Seawater desalination is a process that has been widely studied with great interest due the growing water scarcity for human use. Solar distillation is a very ancient method, the productivity, energy requirements and the consequent cost of the desalinated water depends at least of the efficiency that can be reached in every single step of those systems. Due the limited solar irradiance absorption and to water evaporation transformation capacity, due to glass and water radiation absorbance and the ambient interaction, heat losses limit the overall thermal process efficiency and consequently productivity. Since in passive solar stills all energy comes from solar irradiation, this process maximum productivity will be limited for total solar irradiance that may be available in a defined zone of the world defined by their geographical localization, season of the year and local climatic conditions. All thermal process with this energy will be thermodynamically limited by heat transfer coefficient values reached in the dispositive, by the maximum value that can reach the evaporative heat transfer coefficient, and heat radiation and convective losses coefficients being minimum. In this paper, comparative analysis is presented from several process proposed models, device reported data; solar irradiation reported data reaching about 7.2 - 7.4 kWh/m2 and estimations for productivity intervals for this devices area about 6.7 - 6.9 kg/m2d; efficiency calculated with available reported data are about 0.16 of the global solar irradiance

Keywords : Desalination; Passive Solar Still; Solar Still Productivity; Solar Still Efficiency.

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