Study of heat and mass transfer phenomena and entropy rate of humid air inside a passive solar still

Yemna, Sarray; Hidouri, Nejib; Mchirgui, Ali; Brahim, Ammar Ben

doi:10.1016/j.desal.2017.01.009

Cited by 28 publications

(12 citation statements)

References 29 publications

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“…Thus, it can be concluded that all improvement made on the solar still's configuration that lead to accelerate the evaporation process has a greatest effect on the enhancement of efficiency. The obtained theoretical results for the improved solar still are compared to the study of Sarray et al [17], which has been carried out to investigate the heat and mass transfer for a simple solar still device in Tunisia. A remarkable increase in the water temperature is obtained due to the transferred heat energy by convection from the tray to the water film (qc,t-w).…”

Section: Energy Balance Of Outer Basin Linermentioning

confidence: 98%

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Theoretical Investigation of a Novel Solar Still Configuration for Enhanced High-Quality Drinking Water Production

Jobrane

Kharroubi

Kahn³

et al. 2019

WIT Transactions on Ecology and the Environment

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Lack of safe and reliable drinking water constitutes a major problem due to a rising worldwide population, global socioeconomic development, increasing environmental pressure and climate change. Hence, solar distillation technology for drinking water production presents a conceivable solution for reducing the global water stress. The method requires low capital investment, low maintenance and no energy cost. However, the yield is generally limited. This paper proposes a new solar still configuration using an alternative mode of condensation and thermodynamics. The new solar still was designed to increase the productivity and to improve the efficiency of the conventional solar still. A theoretical study is developed based on a mathematical modelling approach and aims to investigate the performance of the new concept. The obtained results using Matlab software were compared to the conventional solar still system. It has been found that the daily productivity enhancement of the proposed system is around 68% compared to the simple device. An optimization procedure of the proposed solar still was performed in this study based on the design of experiment technique (DoE) using Taguchi approach.

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Section: Energy Balance Of Outer Basin Linermentioning

confidence: 98%

“…Air-water vapor mixture temperature, T v (°C), is assumed to be the arithmetic mean value of water and inner ETFE cover temperatures [17] T v = .…”

Section: Energy Balance Of the Traymentioning

confidence: 99%

Theoretical Investigation of a Novel Solar Still Configuration for Enhanced High-Quality Drinking Water Production

Jobrane

Kharroubi

Kahn³

et al. 2019

WIT Transactions on Ecology and the Environment

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show abstract

“…(xiii) The ambient temperature varies during the day according to a sinusoidal law :

T_{amb} = ((), \frac{T_{amb, max} + T_{amb, min}}{2}) + ((), \frac{T_{amb, max} - T_{amb, min}}{2}) \sin ((), \frac{π (t - t_{sunrise})}{12}) .

…”

Section: Process Principles and Mathematical Modelingmentioning

confidence: 99%

Numerical and experimental investigation of a modified solar basin using as a bubbler humidifier in humidification–dehumidification desalination system

Halima¹,

Frikha

Gabsi

2018

Env Prog and Sustain Energy

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This article presents a theoretical study and experimental validation of a new solar bubbler basin using as a humidifier in humidification–dehumidification desalination system. The prototype consists mainly of a simple solar basin, filled with water, through which air is forced to travel upwards in form of bubbles. A detailed mass and heat transfer analysis was elaborated to model the dynamic behavior of the new humidifier. It is through a comparison with the experimental data that the validity of the proposed model was tested. The simulation results have revealed that the humidification efficiency and the amount of evaporated water can reach 98% and 6 kg m−2 day−1, during the spring equinox. The effects of some operational parameters (water depth, inlet air temperature, and flow rate) were investigated. It was found that the inlet air temperature and flow rate have a significant effect on the water content difference in the humidifier. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 518–526, 2019

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“…It was reaffirmed that the water depth has an inverse effect on productivity as well as efficiency of solar still. Sarray et al [55] performed transient heat and mass transfer analysis and investigated the entropy rate of humid air inside a solar still. It was reported that an increase of partial pressure and humid air temperature favors solar still productivity.…”

Section: Introductionmentioning

confidence: 99%

“…Sarray et al . performed transient heat and mass transfer analysis and investigated the entropy rate of humid air inside a solar still. It was reported that an increase of partial pressure and humid air temperature favors solar still productivity.…”

Section: Introductionmentioning

confidence: 99%

Effect of specific height on productivity and thermal efficiency of a solar still: An experimental approach under indoor environment

Jamil¹,

Akhtar²

2019

Env Prog and Sustain Energy

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A novel experimental approach is presented where studies have been conducted on a solar still at four specific heights in the range of 0.266–0.341 m (in steps of 0.025 m) keeping other dimensions constant. Performance of solar still is established under indoor environment to suppress meteorological factors. Uniform heat was supplied to the solar still through flat plate‐type electrical heaters. For each specific height, the performance of the solar still was evaluated at five heat fluxes (600–1000 W/m2 in steps of 100 W). Performance of solar still at different specific heights was compared in terms of operating temperatures, productivity, and efficiency. It was found that reduction in specific height enhances distillate productivity as well as thermal efficiency of the solar still due to reduction in cavity volume and an increase in average operating temperature. An increase of in daily distillate yield of 89.44% (at 600 W/m2), 56.07% (at 700 W/m2), 28.50% (at 800 W/m2), 38.60% (at 900 W/m2), and 37.38% (at 1000 W/m2) between Case 1 to Case 4 was observed. Further, between Case 1 and Case 4, the thermal efficiency increased from 27.29 to 46.18%, 32.73 to 51.06%, 36.82 to 52.17%, 41.25 to 56.79%, and 42.55 to 57.50% at 600, 700, 800, 900, and 1000 W, respectively. Results demonstrate that for a particular specific height the total daily productivity increases linearly with heat flux. Correlation for estimating thermal efficiency of solar still is proposed in terms of the aspect ratio and input power. © 2019 American Institute of Chemical Engineers Environ Prog, 38: e13227, 2019

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Study of heat and mass transfer phenomena and entropy rate of humid air inside a passive solar still

Cited by 28 publications

References 29 publications

Theoretical Investigation of a Novel Solar Still Configuration for Enhanced High-Quality Drinking Water Production

Theoretical Investigation of a Novel Solar Still Configuration for Enhanced High-Quality Drinking Water Production

Numerical and experimental investigation of a modified solar basin using as a bubbler humidifier in humidification–dehumidification desalination system

Effect of specific height on productivity and thermal efficiency of a solar still: An experimental approach under indoor environment

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