Effect of condenser design on the performance of the natural circulation loop solar still: An experimental study

Rahmani, A.; Zaidi, Yamina

doi:10.1002/htj.22523

Cited by 3 publications

(1 citation statement)

References 61 publications

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“…Solar stills (SSs) are distillation systems driven only by solar energy. 7 Basin SSs are inexpensive, easily constructed, and require little maintenance; however, because of their low productivity, they are rarely commonly employed. Many studies have been conducted to enhance the productivity of basin-type SSs.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of a stepped solar still employing a phase change material, a conical tank, and a solar dish

Dawood

Shehata

et al. 2022

Intl J of Energy Research

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The configuration of an external solar dish improves the performance of stepped slope solar still (SS) in an experimental setting. The use of an external solar dish raises the effects of the water basin, resulting in a higher rate of evaporation. The stepped still was designed, built, and tested in Ismailia, Egypt, using local weather conditions. The proposed SS had a 1 m 2 base area and eight steps, a solar dish with a concentration ratio of 80, a cone tank, two centrifugal pumps, four photovoltaic modules totaling 1000 W, a control unit, and solenoid valves. The impact of utilizing the storage material during the phases was investigated. A nozzle was installed at the top of the cone tank. Four mass flow rates of circulated water were examined 250, 350, 450, and 550 mL/min. The control unit receives inputs from the photovoltaic output, photodiodes, and water temperature inside the cone. The control unit outputs the signal for the two solar dish motors, centrifugal pumps, and solenoid valves. First, a standard stepped SS, second, a stepped SS using phase change material (PCM), and finally, a stepped SS using PCM combined with a solar dish were investigated. The conventional stepped SSs with PCM had an optimal mass flow rate of 250 mL/min, whereas the stepped SS integrated with the solar dish had 550 mL/min of mass flow rate (an optimum value). The highest daily freshwater productivity was 7.63, 9.18, 11.23, and 13.9 kg/d for water spraying mass flow rates of 250, 350, 450, and 550 mL/min, respectively, with 0.0161 $/L/m 2 of a maximum projected cost, according to data from an integrated stepped SS.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of a stepped solar still employing a phase change material, a conical tank, and a solar dish

Dawood

Shehata

et al. 2022

Intl J of Energy Research

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Effect of Tray Geometry on Multitray Stepped Solar Still Performance: An Experimental Study

Rahmani,

Saadi,

Keblouti

2024

Heat Trans

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The multitray solar still (MTSS) is one of the most efficient and economical designs compared with other solar still systems. MTSS has lower heat loss and a large evaporation area, and its basin is more exposed to solar radiation. Nevertheless, optimizing the tray's geometry is essential to improve the still's thermal behavior and productivity. The primary goal of this study is to examine the effect of the tray's geometry on the MTSS performance under outdoor experiments. A comparative analysis was conducted between the triangular‐trays solar still (TTSS), the rectangular‐trays solar still (RTSS), and the single‐slope conventional solar still (CSS) in winter and summer weather conditions. Results show that integrating a multitray evaporator improves the daily yield compared with the CSS and that the thermal performance of the modified solar still depends mainly on the weather conditions. The comparison shows that the triangular trays are more effective than the rectangular ones. The daily productivity of TTSS exceeds that of RTSS by 10% in winter and 24.24% in summer. Moreover, the daily thermal efficiencies of CSS, RTSS, and TTSS are maximum in summer conditions by about 28.1%, 41.2%, and 44.15%, respectively.

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Sustainable high-pressure light-driven water pump with a spiral tube structure and Büttiker–Landauer ratchet

Sugioka

Yoshijima

2022

Physics of Fluids

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Developing sustainable water transportation technology is essential for solving water shortage problems. In this study, we proposed a sustainable high-pressure light-driven water pump that used a spiral tube structure (where light hit one side and shadowed the other) with a B\"{u}ttiker--Landauer (BL) ratchet. Moreover, we examined the performance of this water pump. By using a polyurethane tube with a diameter of 2.5 mm and length of 5 m, we demonstrated that the light-driven BL pump lifted water from a water source against the force of gravity, transported it horizontally along the spiral tube, and removed it from the tube against the surface tension. In particular, by the height scale-up design, we observed $\sim$800 times larger actual pressure difference ($\Delta P \sim 40$ Pa) than the previous light-driven BL pump along with the pumping flow velocity up to 2.4 mm/s. In addition,by proposing a model that considers the effect of the transportation of heat energyfrom the hot region to the cold region, we explain the experimentally observed self-adjustment phenomenon for a flow velocity. Since our pump can work under sunlightwithout using electricity or fossil fuels, it is more sustainable than other pumps. Our findings should contribute to practical sustainable water transportation.

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Effect of condenser design on the performance of the natural circulation loop solar still: An experimental study

Cited by 3 publications

References 61 publications

Experimental investigation of a stepped solar still employing a phase change material, a conical tank, and a solar dish

Experimental investigation of a stepped solar still employing a phase change material, a conical tank, and a solar dish

Effect of Tray Geometry on Multitray Stepped Solar Still Performance: An Experimental Study

Sustainable high-pressure light-driven water pump with a spiral tube structure and Büttiker–Landauer ratchet

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