Energy and exergy analysis of solar stills with micro/nano particles: A comparative study

Sharshir, Swellam W.; Peng, Guilong; Elsheikh, Ammar H.; Edreis, Elbager M.A.; Eltawil, Mohamed A.; Abdelhamid, Talaat; Kabeel, A.E.; Zang, Jianfeng; Yang, Nuo

doi:10.1016/j.enconman.2018.09.074

Cited by 172 publications

(42 citation statements)

References 48 publications

(67 reference statements)

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“…They compared productivity of the modified plant with traditional plant and found productivity enhanced by 41.18% and 32.35% with graphite and copper oxide. Exergy efficiency and cost of water production of the modified solar still plant were also confirmed better than traditional plant [26]. Some important outputs related to various solar still plants are also discussed as; Kabeel [27] found 4.0 L/m 2 /day water with concave wick basin pyramidal shaped solar still, Wassouf et al [28] achieved 1.8 L/m 2 /day water with pyramidal and triangular prism shaped solar still.…”

Section: Introductionmentioning

confidence: 81%

“…Latitude and Longitude of this location are 22° 43′ 4.51″ N and 75° 49′ 59.88″ E respectively. After finding the different temperatures and quantities of distilled water, the thermal efficiencies [1][2][3][4] and exergy efficiencies [22][23][24][25][26] have been found in different climatic conditions by adopting the following methodology. First, the thermal efficiency can be defined as the ratio of the amount of heat that is absorbed by water which is present in the basin of the solar still to the solar energy or solar radiation which is received by the rooftop i.e.…”

Section: Methodsmentioning

confidence: 99%

“…exergy of the system [39][40][41][42]. In this research work exergy inputs, exergy outputs and exergy efficiencies for single and double slope solar stills have been calculated by the following equations [22][23][24][25][26][34][35][36][37].…”

Section: Methodsmentioning

confidence: 99%

“…Similarly, various analyses have also been performed on different double slope solar still plants separately with minimum basin depth, different energy storing materials and multi wicks by consideration of air velocities and forced convective heat transfer [15][16][17][18][19][20][21]. Then exergy concept has been applied to the solar distillation plants [22][23][24][25][26]. Kabeel et al worked in the climate of the Birkat Elsab City, Monufia, Egypt on two different solar still plants considering composite material and phase changing material, and found the total cost of distilled water with composite material was about 0.0014-0.00163 US dollars per liter and it was less than the phase changing material by 27%.…”

Section: Introductionmentioning

confidence: 99%

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Comparative exergy and exergy efficiency analyses of fabricated single and double slope solar still plants at Indore: case study

et al. 2020

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In this research project two solar still plants have been fabricated; single and double slope still plants. The exergy and exergy efficiency concepts have been applied for the comparative analyses of both solar stills. Experimental readings, i.e. various temperatures, amounts of distilled water and solar radiations have been taken for solar stills at different time intervals in Indore (22° 43′ 4.51″ N and 75° 49′ 59.88″ E). The percentage variations in the different parameters, i.e. increments in temperature, increments in quantity of water, thermal efficiencies, rates of exergy at inlet/outlet and exergy efficiencies have also been calculated for stills at various solar intensities and time intervals. After experimental and comparative analyses, better outputs have been shown at 14:50 PM for double slope and 14:45 PM for single slope plant due to the cumulative effects of solar radiations on the still plants. During this period thermal/exergy efficiencies, i.e. 46.630/1.949% and 47.259/3.389% were found the best. The performance of single slope solar still has been found better, and 14:30 to 14:50 PM time interval has been recorded superior for the distillation of water through still plants where percentage increments of the performance evaluating parameters were enhanced. Keywords Single and double slope solar stills • Thermal efficiency • Rates of inlet and outlet exergy • Exergy efficiency • Solar radiation List of symbols C Specific heat of water (J/kg K) dT w Temperature difference which was achieved due to solar energy (K) I b R B Solar radiation which is available for single and double slope solar still (W/m 2) L Length of the solar still (m) m Mass flow rate of pure water (kg/s) T 0, T w and T s Ambient, water and Sun's surface temperatures (K) W Width of the solar still (m) Greek symbols η Thermal efficiency of the solar still (%) α g , ρ g and τ g Absorptivity, reflectivity and transmissivity of the glass Ψ in and Ψ out Exergy at inlet and outlet for single and double slope solar still (W)

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Section: Introductionmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative exergy and exergy efficiency analyses of fabricated single and double slope solar still plants at Indore: case study

et al. 2020

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“…Adding nanoparticles (1-100 nm) into a base fluid in heating and cooling processes is one of the methods to increase the overall heat transfer coefficient between the fluid and the surrounding surfaces [4][5][6]. The main reason of this phenomenon is the significant increasing of the thermal conductivity of the nanofluid (with nanoparticles) compared with the base fluid (without nanoparticles) [7][8][9][10][11]. Effects of different parameters, such as temperature, volume fraction, particle shape and particle size) on the thermal conductivity ratio (TCR) of the nanofluid and that of its base fluid studied in many articles [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

An artificial neural network based approach for prediction the thermal conductivity of nanofluids

et al. 2020

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Thermal conductivity is an important thermophysical property of nanofluids in many practical heat transfer applications. In this study, a novel approach is proposed to predict the thermal conductivity of nanofluids under multiple operating parameters. The proposed approach may be extended to be used to other thermophysical properties of nanofluids. The Kohonen's self-organizing maps (SOM), as an unsupervised artificial neural network (ANN), is used to provide an accurate prediction tool for the problem in hand. Furthermore, SOM, similar to any ANN-based approach, can handle nonlinear and complex input-output relationships with high generalization ability. Comparison of the SOM predicted values with corresponding available theoretical results as well as experimental data implies high prediction capability of the developed approach. The proposed approach was utilized to predict thermal conductivity ratio of oxide (Al 2 O 3 , CuO and TiO 2)/ water nanofluids under various operating conditions (nanoparticle size, temperature, and nanoparticle volume fraction). Keywords Nanofluids • Thermal conductivity • Artificial neural networks • Self-organizing maps List of symbols k Thermal conductivity (W/(m K)) T Temperature (°C) x Input vector w j Synaptic weight vector h ki Topological neighborhood d ik Euclidean distance r Thermal conductivity ratio Effective width of the topological neighborhood r Position vector Time constant P Projection matrix I g Identity matrix Volume fraction (%)

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Efficient Interfacial Solar Steam Generator with Controlled Macromorphology Derived from Flour via “Dough Figurine” Technology

Wang

et al. 2019

Energy Tech

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A solar‐driven interface steam generator (SISG) has potential applications in saline water desalination and polluted water purification. A shape‐ and size‐controlled, low‐cost, eco‐friendly solar‐absorber material is urgently desired for practical applications of SISGs. Herein, a facile, sustainable, and scalable approach is proposed to produce tailored SISGs with controlled macromorphology derived from flour via “dough figurine” technology originating from the China Han Dynasty. Three kinds of self‐floated flour‐based absorbers, i.e., near‐cylindrical (integrated), near‐spherical (loose packing), and powdery (dense packing) absorber used as SISGs, are discussed. More importantly, it is found that the macromorphology significantly influences water transport and interfacial thermal management of SISGs; thus the integrated absorber has an obvious advantage over the other two absorbers, which possesses a high evaporation efficiency of 71.9% at normal solar illumination. The proposed “dough figurine” technology breaks the limitations of the inherent geometry of reported biomass‐based SISGs, which provides an important guidance for SISG use in remote and impoverished areas.

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Energy and exergy analysis of solar stills with micro/nano particles: A comparative study

Cited by 172 publications

References 48 publications

Comparative exergy and exergy efficiency analyses of fabricated single and double slope solar still plants at Indore: case study

Comparative exergy and exergy efficiency analyses of fabricated single and double slope solar still plants at Indore: case study

An artificial neural network based approach for prediction the thermal conductivity of nanofluids

Efficient Interfacial Solar Steam Generator with Controlled Macromorphology Derived from Flour via “Dough Figurine” Technology

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