Prediction of clear-sky biologically effective erythematic radiation (EER) From global solar radiation (250–2800 nm) at Cairo, Egypt

Khalil, Samy A.; Shaffie, A.M.

doi:10.1016/j.asr.2012.12.004

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…All the experiments were carried out under direct sun irradiation at the roof of the National Research Centre, Cairo, Egypt (latitude 30 ∘ N, longitude 31 ∘ E) [10]. The initial concentration of MB solution was 1.5 × 10 −5 M. The total volume ( ) of the treated MB solution was 2.5 L. This volume is divided into two parts: the total irradiated volume (in glass tubes) ( ) is 0.723 L and the dead reactor volume (i.e., connectors, tank, pipes, etc.).…”

Section: Photocatalytic Degradation Experimentsmentioning

confidence: 99%

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Flexible Bench-Scale Recirculating Flow CPC Photoreactor for Solar Photocatalytic Degradation of Methylene Blue Using Removable TiO₂Immobilized on PET Sheets

EL-Mekkawi

Nady

Abdelwahab

et al. 2016

International Journal of Photoenergy

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TiO2immobilized on polyethylene (PET) nonwoven sheet was used in the solar photocatalytic degradation of methylene blue (MB). TiO2Evonik Aeroxide P25 was used in this study. The amount of loaded TiO2on PET was approximately 24%. Immobilization of TiO2on PET was conducted by dip coating process followed by exposing to mild heat and pressure. TiO2/PET sheets were wrapped on removable Teflon rods inside home-made bench-scale recirculating flow Compound Parabolic Concentrator (CPC) photoreactor prototype (platform 0.7 × 0.2 × 0.4 m3). CPC photoreactor is made up of seven low iron borosilicate glass tubes connected in series. CPC reflectors are made of stainless steel 304. The prototype was mounted on a platform tilted at 30°N local latitude in Cairo. A centrifugal pump was used to circulate water containing methylene blue (MB) dye inside the glass tubes. Efficient photocatalytic degradation of MB using TiO2/PET was achieved upon the exposure to direct sunlight. Chemical oxygen demand (COD) analyses reveal the complete mineralization of MB. Durability of TiO2/PET composite was also tested under sunlight irradiation. Results indicate only 6% reduction in the amount of TiO2after seven cycles. No significant change was observed for the physicochemical characteristics of TiO2/PET after the successive irradiation processes.

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Section: Photocatalytic Degradation Experimentsmentioning

confidence: 99%

“…Solar energy is a free sustainable source UVA light energy. Egypt has UVA irradiances that reach 40 W/m 2 or even higher on sunny days [10].…”

Section: Introductionmentioning

confidence: 99%

Flexible Bench-Scale Recirculating Flow CPC Photoreactor for Solar Photocatalytic Degradation of Methylene Blue Using Removable TiO₂Immobilized on PET Sheets

EL-Mekkawi

Nady

Abdelwahab

et al. 2016

International Journal of Photoenergy

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“…It is clear that the amount of UVB and G that reach the Earth's surface depends on the amount of ozone traversed along the actual slant path ( Z ) rather than on the TOC (Anton et al , ; Adam, ; Khalil and Shaffie, ). Therefore, values for Z were introduced to investigate the influence of the ozone amount on UVB/G.…”

Section: Data Usedmentioning

confidence: 99%

Atmospheric modulations of the ratio of UVB to broadband solar radiation: effect of ozone, water vapour, and aerosols at Qena, Egypt

Adam

2013

Intl Journal of Climatology

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ABSTRACT:This study is an attempt to assess atmospheric modulations of the radiometric ratio of ultraviolet-B (UVB) to broadband solar radiation (G). It examines the role of the atmosphere as a filter, absorbing and scattering portions of the solar spectrum, shielding the biosphere from damaging doses of UVB. The diurnal variability of UVB/G at the Earth's surface has been evaluated by analysing 10-year hourly measurements of UVB and G on a horizontal surface at Qena, Egypt. The results show that, throughout the whole period, the values of hourly UVB/G varied from 0.03 to 0.73%, with an average value of 0.27%. This average represents only 17% of the corresponding value outside the atmosphere (1.56%). Moreover, the study quantifies the impact of ozone, water vapour, and aerosols on UVB/G under cloudless conditions. An analysis of the relationship between this ratio and the slant total ozone column (Z ) was also carried out. It showed that the ratio decreased with increasing Z . For Z = 537 DU, the average UVB/G was almost 53.47% lower than that at low Z (277 DU). The influence of precipitable water (W ) on UVB/G was determined under limited change in Z (<8.72%) and almost constant turbidity level (Ångström turbidity coefficient, β, of 0.19). The values of UVB/G increased with increasing W . For an average W = 1.13 cm, the average UVB/G was approximately 3.93% lower than at high W (2.82 cm). Moreover, the study illustrated the effect of aerosols on UVB/G when their influence on this ratio is greater than the impact of other atmospheric factors such as ozone and water vapour. It can be concluded that the ratio of the change in UVB/G to the change in β varies from 0.16 to 0.59%, with an average value of 0.33%.

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Measurement and estimation of ultraviolet radiation in Pearl River Delta, China

Gong

Zhang

Wang

et al. 2015

Journal of Atmospheric and Solar-Terrestrial Physics

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Prediction of clear-sky biologically effective erythematic radiation (EER) From global solar radiation (250–2800 nm) at Cairo, Egypt

Cited by 7 publications

References 37 publications

Flexible Bench-Scale Recirculating Flow CPC Photoreactor for Solar Photocatalytic Degradation of Methylene Blue Using Removable TiO₂Immobilized on PET Sheets

Flexible Bench-Scale Recirculating Flow CPC Photoreactor for Solar Photocatalytic Degradation of Methylene Blue Using Removable TiO₂Immobilized on PET Sheets

Atmospheric modulations of the ratio of UVB to broadband solar radiation: effect of ozone, water vapour, and aerosols at Qena, Egypt

Measurement and estimation of ultraviolet radiation in Pearl River Delta, China

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Prediction of clear-sky biologically effective erythematic radiation (EER) From global solar radiation (250–2800 nm) at Cairo, Egypt

Cited by 7 publications

References 37 publications

Flexible Bench-Scale Recirculating Flow CPC Photoreactor for Solar Photocatalytic Degradation of Methylene Blue Using Removable TiO2Immobilized on PET Sheets

Flexible Bench-Scale Recirculating Flow CPC Photoreactor for Solar Photocatalytic Degradation of Methylene Blue Using Removable TiO2Immobilized on PET Sheets

Atmospheric modulations of the ratio of UVB to broadband solar radiation: effect of ozone, water vapour, and aerosols at Qena, Egypt

Measurement and estimation of ultraviolet radiation in Pearl River Delta, China

Contact Info

Product

Resources

About

Flexible Bench-Scale Recirculating Flow CPC Photoreactor for Solar Photocatalytic Degradation of Methylene Blue Using Removable TiO₂Immobilized on PET Sheets

Flexible Bench-Scale Recirculating Flow CPC Photoreactor for Solar Photocatalytic Degradation of Methylene Blue Using Removable TiO₂Immobilized on PET Sheets