An experimental study of the dry deposition mechanism for airborne dust

Biryukov, S.

doi:10.1016/0021-8502(96)00111-5

Cited by 7 publications

(6 citation statements)

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“…Preliminary attempts to study dust deposition via optical measurements on glass plates were carried out by Biryukov (1998) and Dolev (2005) in the Negev desert in Israel. However, these authors did not correct for particle shape, and their deposition data were presented in relative terms (Biryukov, 1998) or in number of particles per unit surface per unit time (Dolev, 2005), i.e. not as a mass flux.…”

Section: Optical Counting On Glass Platesmentioning

confidence: 99%

Techniques to measure the dry aeolian deposition of dust in arid and semi‐arid landscapes: a comparative study in West Niger

Goossens

Rajot²

2007

Earth Surf Processes Landf

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Seven techniques designed to measure the dry aeolian deposition of dust on a desert surface were tested during field experiments in Niger, central-west Africa. Deposition fluxes were measured during eight periods of 3-4 days each. Experimental techniques tested were the MDCO (marble dust collector) method, the Frisbee method, the glass plate method (optical analysis of dust deposited on glass surfaces using particle imaging software), the soil surface method (deposition on a simulated desert floor) and the CAPYR (capteur pyramidal) method. Theoretical techniques tested were the inferential method and the combination method (gradient method extended with a deposition term for coarse dust particles). The results obtained by the MDCO, Frisbee, inferential and combination methods could be directly compared by converting the data to identical standard conditions (deposition on a water surface producing no resuspension). The results obtained by the other methods (glass plate, soil surface, CAPYR) were compared relatively. The study shows that the crude (unconverted) deposition fluxes of the five experimental techniques were similar, while the crude deposition fluxes calculated by the two theoretical techniques were substantially higher, of the order of four to five times as high as for the experimental techniques. Recalculation of the data to identical environmental conditions (the standard water surface) resulted in nearly identical deposition fluxes for the MDCO, Frisbee, inferential and combination techniques, although the latter two still had slightly higher values (but the differences remained small). The measurements illustrate the need to include a grain shape factor in theoretical dust deposition models. Without such a factor, theoretical models overestimate the deposition. The paper also discusses the advantages and disadvantages of the techniques tested.

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Section: Optical Counting On Glass Platesmentioning

confidence: 99%

Techniques to measure the dry aeolian deposition of dust in arid and semi‐arid landscapes: a comparative study in West Niger

Goossens

Rajot²

2007

Earth Surf Processes Landf

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“…Dust is one of the natural elements present in most environments. The particle size and composition depend on the location . In some regions, dusty weather conditions tend to be more severe than in others.…”

Section: Introductionmentioning

confidence: 99%

Dust-induced shading on photovoltaic modules

Qasem

Betts

Müllejans

et al. 2012

Prog. Photovolt: Res. Appl.

192

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The effect of dust on photovoltaic modules is investigated with respect to concentration and spectral transmittance. Samples were collected in the form of raw dust as well as accumulated dust on exposed sheets of glass at different tilt angles. Spectral transmittance of the samples was determined. Transmittance variation between top, middle and bottom was identified for samples collected at different inclinations, where the worst case was seen at a tilt angle of 30 o with a nonuniformity of 4.4% in comparison with 0.2% for the 90 tilt. The measured data showed a decrease in transmittance at wavelengths <570 nm. Integrating this with measured spectral responses of different technologies demonstrates that wide band-gap thin-film technologies are affected more than, for example crystalline silicon technologies. The worst case is amorphous silicon, where a 33% reduction in photocurrent is predicted for a dust concentration of 4.25 mg/cm 2 . Similarly, crystalline silicon and CIGS technologies are predicted to be less affected, with 28.6% and 28.5% reductions in photocurrent, respectively. The same procedure was repeated with varying Air Mass (AM), tilt angle and dust concentration values to produce a soiling ratio table for different technologies under different AM, tilt angle and dust concentration values. Copyright

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“…Goosens and Van Kerschaever provided a relation between airborne dust, accumulated dust and the reduction in PV cell short circuit current [19] Using a wind tunnel experiment, they showed that there is an aerodynamic relation between airborne dust, accumulated dust and the reduction in PV power output. Others reported a relation between dust particle size, particle distribution, tilt angle and the reduction in transmittance of solar radiation [3,10,13,15]. In general, the literature agrees on a reduction in short circuit current with increase in accumulated dust density.…”

Section: Modelling Structure and Spatial 3 Dimensional Modelmentioning

confidence: 69%

“…The variation in dust particle size and composition depends on the location [10]. In some regions, dusty weather conditions tend to be more severe than in others.…”

Section: Modelling Structure and Spatial 3 Dimensional Modelmentioning

confidence: 99%