Evaluation of in-duct UV-C lamp array on air disinfection: A numerical analysis

Atci, Fatih; Çetin, Yunus Emre; Avcı, Mete; Aydın, Orhan

doi:10.1080/23744731.2020.1776549

Cited by 24 publications

(30 citation statements)

References 26 publications

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“…However, CFD simulation shows that the average UV dose should be 10.97 J/m 2 , a more accurate dose value that gives closer disinfection efficacy for MS2 with the experimental results [ 78 ]. In the same manner, the average UV dose for EPA 600/R-06/051 ( Table 2 ) was corrected from 2.95 to 18 [ 10 ], 18.3 [ 79 ] and 18.45 J/m 2 [ 78 ] using CFD simulations. The UV dose differences in the three simulation results are attributed to the particle trajectories within the system, the 25% or 15% diffusive wall reflectivity used, and the different particle characteristics.…”

Section: In-duct Uvgi System Applicationsmentioning

confidence: 99%

“…In addition to estimating the average UV dose of a UVGI system, the CFD simulation with the DPM can reveal the cumulative UV dose distribution with respect to particle counts and the standard deviation of the system average UV dose, which is particularly important from the perspective of inactivating an individual microorganism. For instance, a study shows that an arrangement of four vertical lamps has an average UV dose and standard deviation of 18.3 and 4.17 J/m 2 [ 79 ]. In reality, the overdosed UV irradiance on one particle will not transfer to and average with other underexposed particles, resulting in the wasted energy input for the overdosed bioaerosols and insufficient characterization of a system with the average UV dose.…”

Section: In-duct Uvgi System Applicationsmentioning

confidence: 99%

“…S1 ), which resulted in average UV doses (standard deviations) of 28.33 (10.06), 28.21 (5.39), 27.91 (16.32), 30.18 (12.60), 26.45 (5.37) and 31.05 J/m 2 (5.45 J/m 2 ), respectively [ 81 ]. From a UVGI system design perspective, a higher average UV dose and a single sharp peak (lower UV dose standard deviation) with all particles receiving the required UV dose is expected [ 78 , 79 , 81 ]. Thus, the lamp array with all three lamps located at the center of the duct and distributed across its height provides the best performance (average UV dose of 31.05 J/m 2 and standard deviation of 5.45 J/m 2 ).…”

Section: In-duct Uvgi System Applicationsmentioning

confidence: 99%

“…Increasing the lamp numbers increases the UV dose distribution uniformity and indicates better energy usage. [ 79 ] 0.61 × 0.61 × 1.83 4, perpendicular 18.3 (4.17) 1. UV dose distribution non-uniformity (UV dose standard deviation) increases when changing the lamp array configuration from vertical to horizontal.…”

Section: In-duct Uvgi System Applicationsmentioning

confidence: 99%

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Ultraviolet germicidal irradiation (UVGI) for in-duct airborne bioaerosol disinfection: Review and analysis of design factors

Luo

Zhong

2021

Building and Environment

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The rapid increase in global cases of COVID-19 illness and death requires the implementation of appropriate and efficient engineering controls to improve indoor air quality. This paper focuses on the use of the ultraviolet germicidal irradiation (UVGI) air purification technology in HVAC ducts, which is particularly applicable to buildings where fully shutting down air recirculation is not feasible. Given the poor understanding of the in-duct UVGI system regarding its working mechanisms, designs, and applications, this review has the following key research objectives: Identifying the critical parameters for designing a UVGI system, including the characterization of lamp output, behavior of the target microbial UV dose-response, and evaluation of the inactivation performance and energy consumption. Elucidating the effects of environmental factors (air velocity, air temperature, and humidity) on the UVGI system design parameters and optimization of the in-duct UVGI design. Summarizing existing UVGI system designs in the literature and illustrating their germicidal and energy performance in light of COVID-19 mitigation.

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Section: In-duct Uvgi System Applicationsmentioning

confidence: 99%

Section: In-duct Uvgi System Applicationsmentioning

confidence: 99%

Section: In-duct Uvgi System Applicationsmentioning

confidence: 99%

Section: In-duct Uvgi System Applicationsmentioning

confidence: 99%

See 2 more Smart Citations

Ultraviolet germicidal irradiation (UVGI) for in-duct airborne bioaerosol disinfection: Review and analysis of design factors

Luo

Zhong

2021

Building and Environment

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“…Among the physical technologies, non-ionising UV-C irradiation is increasingly used, alone or in combination with other cleaning and disinfection methods, in a wide range of applications including food industry and food safety [7,8], agriculture [9], water decontamination [10,11], indoor air and surfaces [12,13,14], healthcare environments [15,16,17,18,19], and personal protective equipment [20], the latter application being particularly assessed in the context of the COVID-19 pandemics and subsequent critical shortage of supply chain [21,22]. Germicidal ultraviolet irradiation (GUVI) encompasses a continuous range of UV wavelengths between 200 to 280 nm.…”

Section: Introductionmentioning

confidence: 99%

Acaricidal Activity of UV-C irradiation on Tetranychus urticae and eggs using pulsed krypton fluoride excimer laser

Gala¹,

Rebane²,

Ambroise³

et al. 2021

Preprint

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Background While pulsed UV-C light sources such as excimer lasers are used in emerging non-thermal food decontamination method, they also have a high potential for a wide range of other microbial decontamination applications. The acaricidal effect of an experimental UV-C irradiation device was assessed using two-spotted spider mite female adults Tetranychus urticae and eggs as a model. Methods The UV-C light source was generated by a pulsed krypton fluoride (KrF) excimer laser operating at 248 nm emission wavelength. Pulse energy and pulse repetition rate were 5mJ, and up to 100Hz rate, respectively. Distance from light source to target was 150 mm with a target surface of 21.6 cm². The exposure time of the mite and fresh eggs varied from 1 to 4 minutes at a power of 300 mW. The post-irradiation acaricidal effects (mites’ mortality) were assessed immediately and measured 24 h post-irradiation. Effects on the hatchability of irradiated eggs were observed daily post-irradiation for up to 12 days. Results The mortality of mites observed with an energy amount of 5 and 40 mJ/mm² was 26% and 90%, respectively. The mortality at 80 mJ/mm² reached 99%. The effect of exposure duration on mortality was minimal. The effect of irradiation of eggs hatchability was even more important, with about 100% mortality with as little as 5 mJ/mm² for each exposure time. Conclusions A high mite mortality and lethal egg damage was already observed after less than 1 min exposure to UV-C pulsed irradiation. Pending further developments and feasibility studies, the current results and features of the UV-C generator (energy output modulation and applicability to varying spot sizes) open up a large field of germicidal applications requiring long-range radiation.

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