Efficiency of a photovoltaic thermal stepped solar still: Experimental and numerical analysis

Naroei, Mehrnaz; Sarhaddi, Faramarz; Sobhnamayan, F.

doi:10.1016/j.desal.2018.04.014

Cited by 76 publications

(22 citation statements)

References 14 publications

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“…A theoretical model of rotating pump has been developed, calibrated and validated using experimental data in [10]. In [11], the authors enhanced the stills productivity via connection of stepped solar stills to photovoltaic thermal water collector (PVT). Where, the PVT water collector area and mass flow rate of saline water has a significant effect on water desalination efficiency.…”

Section: A Research Backgroundmentioning

confidence: 99%

“…The deviation percent could be calculated through utilization of an objective function as illustrated in Eqs. (10) and (11). The objective function can be defined as an optimization function, which can be employed for both maximization and minimization of a real data to a modeled one.…”

Section: Model Verificationmentioning

confidence: 99%

“…As can be seen from Eqs. (10) and (11), thee objective function has different expressions. The most common one is the nonlinear least squares in Eq.…”

Section: Model Verificationmentioning

confidence: 99%

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Modeling and Experimental Investigation of Solar Stills for Enhancing Water Desalination Process

Mostafa

Abdullah²,

Mohamed

2020

IEEE Access

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Despite the importance of the desalination process in removal of water salinity to produce fresh drinking water, it is an energy-consuming process. Therefore, the use of solar energy as an alternative and free energy source has an important role in enhancing the efficiency of the desalination process. This paper presents an experimental investigation using solar chimney to enhance the desalination process, where a modification to the conventional solar stills has been made. A mathematical model describing air flow inside the solar chimney has been constructed using Computational Fluid Dynamics (CFD). The commercial CFD package fluent release 6.3 has been used in this paper to express the air flow and temperature distribution inside solar chimney. Furthermore, the process parameters such as seasonal temperature, salt concentration, water depth and type of solar desalination unit have been examined to find the best operating conditions. The desalination process has been recommended to be carried out under permissible operating conditions in sunny days, with water depths ranging from (1-2 cm) and low salt concentration ranging from (3.5-8%). The modeled data has been verified with experimental data and the verification results have been estimated at 14%. Simulation results showed that water desalination has been improved by 30%.

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Section: A Research Backgroundmentioning

confidence: 99%

Section: Model Verificationmentioning

confidence: 99%

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Modeling and Experimental Investigation of Solar Stills for Enhancing Water Desalination Process

Mostafa

Abdullah²,

Mohamed

2020

IEEE Access

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“…When the AlO nanofluid was applied, the output freshwater productivity was 29.95%, whereas with ZnO and SnO 2 nanofluids, it was 12.67% and 18.63%, respectively, thus showing a higher production than the one with only water. Naroei et al 12 carried out numerical and experimental studies using a stepped solar still connected to a PVT water collector. Their analyses showed that the required PVT water collector area and mass flow rate to achieve maximum energy efficiency were 1.33 m 2 and 0.068 kg/min respectively.…”

Section: Introductionmentioning

confidence: 99%

Increasing the freshwater productivity of a solar still loaded with CuO nanofluids using vibration motion and cover cooling techniques

et al. 2021

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The performance of a single-slope solar still system has been improved with the addition of copper oxide (CuO) nanopowder in water as nanofluid and thermoelectric glass cover cooling combination. The use of vibration further enhances the performance of distillate water as a result of the accelerated heat transfer. In this study, CuO nanofluids loaded the solar still system at volume concentrations of 0.5%, 1%, and 1.5%. The design, fabrication, and testing of the single still were conducted under the local weather conditions of Alexandria, which is located in the northwest of Egypt. The proposed solar still had a base area of 1 m 2 and fitted with four coiled springs, a DC motor, and a photovoltaic (PV) solar panel. The vibration generator was a three-phased, with a 1-HP power motor (220 V, 50 Hz, and 1380 rpm maximum speed) fixed to a compact disk with a small punch for adding masses to generate the un-mass balance forces. The power source for the DC motor was a 250-W PV. The daily output of fresh water during the experimental period was empirically measured under the same climate conditions, and the results were compared with those of a conventional solar still. The daily rates of freshwater productivity were investigated in two cases: (a) under vibration without cover cooling and (b) under vibration with cover cooling at the three given nanofluid volume concentrations. Based on the results, the highest daily freshwater productivity attained with the vibration and cover cooling (at the 1.5% nanofluid volume concentration) 7.

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“…AbuJazar et al [20] concluded that the yield and efficiency of the inclined copper stepped solar still are 4.383 kg/m 2 day and 58%, respectively. An improving in the performance by 20% was observed for the photovoltaic thermal collector associating with a stepped solar still [21]. A novel design of a multi-side stepped square pyramid solar still (MSSPSS) was examined under passive and active forms [22].…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of the heat exchange in a stepped solar still

Badawy

2021

Egyptian Journal of Solids

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A mathematical modeling for stepped solar still performance is carried out which is not found in most of the previous studies. Computer programs (using Pascal language) are developed for achieving this mathematical model. Effect of the parameters of the still configuration such as the still width (b s ), depth of water (d w ), tray width (W) and the height of tray (H) on the still's performance. Comparisons between the obtained theoretical results and the experimental results from other researches are carried out to corroborate the proposed mathematical model. Comparing thermal performance of the stepped solar still with that of the conventional one shows that the stepped solar still is more efficient. The daily productivity of the conventional and stepped solar stills are found to be 4.0 and 4.51 (kg/m 2 day); separately. The daily efficiency of the conventional and stepped solar stills are 61.48% and 78.33%, individually.

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Efficiency of a photovoltaic thermal stepped solar still: Experimental and numerical analysis

Cited by 76 publications

References 14 publications

Modeling and Experimental Investigation of Solar Stills for Enhancing Water Desalination Process

Modeling and Experimental Investigation of Solar Stills for Enhancing Water Desalination Process

Increasing the freshwater productivity of a solar still loaded with CuO nanofluids using vibration motion and cover cooling techniques

Mathematical modeling of the heat exchange in a stepped solar still

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