Attenuation of diffuse daylight due to dust deposition on glazing in a tropical urban environment

Ullah, M.B.; Kurniawan, Julius Tan; Poh, Lam Khee; Tham, Kwok Wai; Tregenza, P.R.

doi:10.1191/1477153503li080oa

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…A dust particle can be removed from a surface by gravitational, vibrational and centrifugal forces, as well as through air currents. 39…”

Section: Cleaning Methods For Daylighting Systemsmentioning

confidence: 99%

Cleaning innovative daylighting systems: Review and suggested methods

Mayhoub

2016

Lighting Research & Technology

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Innovative daylighting systems (IDS) are used to deliver daylight into windowless spaces and building cores. Cleaning the exposed surfaces is essential for maintaining their efficiency because the accumulation of dirt inhibits their effectiveness. However, a review of the literature has indicated that this issue has not received the attention it deserves. This study reviews the cleaning methods currently used for solar devices and conventional daylighting systems. It also presents the technologies that can currently be employed to produce an IDS cleaning system, and suggests six cleaning mechanisms and 12 cleaning systems that suit different types of IDS in various operating circumstances. These include air-blowing, water-jetting, dragging-contact, rotary-contact and certain aid treatments. Air-cleaning and washing with water can both be used to restore functionality. Wiping and scrubbing are effective for increasing efficiency. Further productivity can be obtained by drying solar collectors after they have been washed. The systems suggested herein can be developed using already available technologies in order to achieve the ultimate in IDS efficiency restoration. However, before this can be done, the economic, environmental and operational aspects, in addition to potential levels of efficacy and applicability, must be assessed.

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“…A dust particle can be removed from a surface by gravitational, vibrational and centrifugal forces, as well as through air currents. 39…”

Section: Cleaning Methods For Daylighting Systemsmentioning

confidence: 99%

Cleaning innovative daylighting systems: Review and suggested methods

Mayhoub

2016

Lighting Research & Technology

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“…Dust includes emissions from agriculture and industry, bird droppings, pollen, mineral dust in a dry area, fibers, sand and clay [ 24 ]. Daylight transmission into buildings is affected by the deposition of atmospheric pollutants on glazing [ 25 ]. Even in a clean UK climate, building windows suffer from dust [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Comfort Analysis of Hafnium (Hf) Doped ZnO Coated Self-Cleaning Glazing for Energy-Efficient Fenestration Application

et al. 2022

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To attain a comfortable building interior, building windows play a crucial role. Because of the transparent nature of the window, it allows heat loss and gain and daylight. Thus, they are one of the most crucial parts of the building envelope that have a significant contribution to the overall building energy consumption. The presence of dust particles on a window can change the entering light spectrum and creates viewing issues. Thus, self-cleaning glazing is now one of the most interesting research topics. However, aside from the self-cleaning properties, there are other properties that are nominated as glazing factors and are imperative for considering self-cleaning glazing materials. In this work, for the first time, Hf-doped ZnO was investigated as self-cleaning glazing and its glazing factors were evaluated. These outcomes show that the various percentages of ZnO doping with Hf improved the glazing factors, making it a suitable glazing candidate for the cold-dominated climate.

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“…For accurate daylight design in a polluted urban area it is important to have appropriate, site-relevant values for the glazing dirt correction factor. Between 1999 and 2003 several field surveys were implemented in the UK and Singapore (Tregenza et al 1999;Sharples et al 2001;Ullah et al 2003) to measure the drop in glazing daylight transmittance due to pollutant depositions in urban buildings. For the British surveys, Tregenza et al (1999) observed an average transmittance reduction of 4-8% for commercial buildings in clean environments, whilst Sharples et al (2001) found that the loss in diffuse transmittance for a vertical window did not usually exceed 10%.…”

Section: Introductionmentioning

confidence: 99%

“…These findings can be used in architectural daylighting calculations for regions environmentally similar to the temperate maritime climate of the UK. Another investigation, in the high-density city of Singapore, which has a tropical humid climate, found a total transmittance reduction ranging from 9% to 36% for vertical and horizontal widows (Ullah et al 2003). In general, Tregenza et al (1999) concluded that the glazing dirt correction factor is related to the particulates in the external atmosphere, precipitation and building form.…”

Section: Introductionmentioning

confidence: 99%

“…In general, Tregenza et al (1999) concluded that the glazing dirt correction factor is related to the particulates in the external atmosphere, precipitation and building form. Two studies (Mastekbayeva and Kumar, 2000;Ullah et al 2003) further emphasized the fact that external atmospheric pollutants should be first considered when evaluating the loss of glazing daylight transmittance. However, the dirt correction factor mentioned above was generally measured via a simple approach (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Air Pollution and Daylight Availability in the Urban Area: Dynamic Simulation in an Openplan Office in London

Du¹,

Zhang²,

Sharples³

2017

Building Simulation Conference Proceedings

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The deposition of air pollutants on glazing can significantly affect the daylight transmittance of building fenestration systems in urban areas. This study presents a simulation analysis of the impact of air pollution and glazing visual transmittance on indoor daylight availability in an open-plan office in London. First, the direct links between glazing visual transmittance and daylighting conditions were developed and assessed. Second, several simple algorithms were established to estimate the loss of daylight availability due to the pollutant deposition at the external surface of vertical glazing. Finally, some conclusions and design strategies to support façade strategies at the early design stage of an urban building project were developed.

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Attenuation of diffuse daylight due to dust deposition on glazing in a tropical urban environment

Cited by 8 publications

References 5 publications

Cleaning innovative daylighting systems: Review and suggested methods

Cleaning innovative daylighting systems: Review and suggested methods

Comfort Analysis of Hafnium (Hf) Doped ZnO Coated Self-Cleaning Glazing for Energy-Efficient Fenestration Application

Air Pollution and Daylight Availability in the Urban Area: Dynamic Simulation in an Openplan Office in London

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