Harris J.N. WelepeHuseyin GunerhanLevent BilirBilir, LeventGünerhan, HüseyinWelepe, Harris J.N.2025-10-062024130036151300-36152667-772510.47480/isibted.14944782-s2.0-85205303063https://www.scopus.com/inward/record.uri?eid=2-s2.0-85205303063&doi=10.47480%2Fisibted.1494478&partnerID=40&md5=36319cb642db4c02ce631086a6267675https://gcris.yasar.edu.tr/handle/123456789/8274https://search.trdizin.gov.tr/en/yayin/detay/1240820https://doi.org/10.47480/isibted.1494478In this paper a parabolic trough humidifying solar collector-based solar still (PHSC-SS) is proposed. Its purpose is to apply some important performance improvement techniques to the flat plate humidifying solar collector-based solar still (flat plate HSC-SS) to significantly improve overall system performance. These included the use of parabolic trough solar concentrators and the design of humidifying solar collectors from evacuated tube collectors. The results reveal that unlike flat plate HSC-SS which must operate with a turbulent airflow regime to achieve optimum overall performance PHSC-SS must operate with a laminar airflow regime and high inlet and outlet temperatures of air (at least 55 °C and less than 100 °C at atmospheric pressure) in the heat collector element. For 900 W/m2 of incident solar irradiance 2 m2 of solar collector area and 000042 kg/s of air flow rate the maximum energy efficiency exergy efficiency and daily freshwater productivity of PHSC-SS were found to be 6812% 1487% and 1697 kg/h respectively. Whereas for the same incident solar irradiance and solar collector area and 01 kg/s of air flow rate those of the flat plat HSC-SS were 729% 112% and between 107-2923 kg/h (for inlet and outlet temperatures of air less than 30 °C at atmospheric pressure) respectively. Although in some extreme cases freshwater productivity of flat plate HSC-SS can be higher than that of PHSC-SS it should be noted that laminar airflow regime confers great advantages to PHSC-SS. These are higher air temperatures at condenser inlet (which ease water condensation process) no need of an auxiliary cooling device (needed in the flat plate HSC-SS) less mechanical vibrations of system reduced condenser size and less energy consumed by air blowers. Furthermore the upper limit of the PHSC-SS is a PHSC-SS that operates without air flow but rather by vaporization of water droplets at boiling point from absorber followed by their suction to condenser similarly to a flash evaporation. © 2024 Elsevier B.V. All rights reserved.Englishinfo:eu-repo/semantics/openAccessEnergy Efficiency, Exergy Efficiency, Heat Collector Element, Parabolic Trough Humidifying Solar Collector, Seawater Desalination, Air Intakes, Aquifers, Barium Alloys, Collector Efficiency, Condenser Tubes, Dielectric Liquids, Firedamp, Fluoridation, Gas Mixtures, Greenhouse Gases, Hydraulic Fluids, Incident Solar Radiation, Ionic Liquids, Ionosphere, Laminar Flow, Liquid Films, Potassium Alloys, Pressure Regulators, Radiogenic Gases, Regain, Snow, Soil Moisture, Solar Irradiance, Synthesis Gas, Turbines, Water Cooling Systems, Energy, Exergy Efficiencies, Flat Plate, Heat Collector Element, Heat Collectors, Parabolic Trough, Parabolic Trough Humidifying Solar Collector, Performance, Seawater Desalination, Solar Stills, DesalinationAir intakes, Aquifers, Barium alloys, Collector efficiency, Condenser tubes, Dielectric liquids, Firedamp, Fluoridation, Gas mixtures, Greenhouse gases, Hydraulic fluids, Incident solar radiation, Ionic liquids, Ionosphere, Laminar flow, Liquid films, Potassium alloys, Pressure regulators, Radiogenic gases, Regain, Snow, Soil moisture, Solar irradiance, Synthesis gas, Turbines, Water cooling systems, Energy, Exergy efficiencies, Flat plate, Heat collector element, Heat collectors, Parabolic trough, Parabolic trough humidifying solar collector, Performance, Seawater desalination, Solar stills, DesalinationParabolic Trough Humidifying Solar CollectorSu KaynaklarıMühendislik, Elektrik Ve ElektronikMeteoroloji Ve Atmosferik BilimlerEnergy EfficiencyHeat Collector ElementFizik, UygulamalıFizik, MatematikExergy EfficiencyMühendislik, KimyaSeawater DesalinationTermodinamikArticle