Effects of Distance, Temperature, and Relative Humidity on the Irradiance of Ultraviolet-C Germicidal Lamp: A Quantitative Study

IF 4.3 2区 环境科学与生态学 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Indoor air Pub Date : 2024-10-11 DOI:10.1155/2024/1951792
Yu Wu, Yuqi Wang, Jinyang Liu, Xinyang Xu, Youwen Song, Xiaorong Zhang, Lili Jiang, Peng Chen
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Abstract

Ultraviolet germicidal irradiation (UVGI) as an engineering control against pathogenic microbes necessitates a clear understanding of operational parameters and environmental effects on inactivation rates. Here, we investigated the variation laws of ultraviolet-C (UV-C) irradiance under the influence of distance, ambient conditions of temperature, and relative humidity (RH) in a dark chamber using 30-W low-pressure mercury lamps, and all data were analyzed with curve fitting methods. UV-C irradiances in each plane were measured as the distance adjusting between 0.5 and 1.2 m, and a threshold of 70 μW/cm2 was utilized to calculate the effective irradiation area. For the temperature and RH, UV-C irradiances were measured at 1 m perpendicular from the lamp axis at the lamp midpoint, with the ambient temperature increasing from 15.5°C to 40°C and RH adjusting from 10% to 97%. Results showed that the UV-C irradiance and effective irradiation area exhibited a notable decrease as the distance increased, both corresponded to polynomial 2nd order fits. The UV-C lamps operate at maximum efficiency at 20°C. Temperature above or below the optimum value will decrease UV output, especially when the ambient temperature exceeds 38°C and the irradiance decreases by 16% compared to the observed maximum. However, the impact of RH on radiant power is negligible with the UV-C irradiance maintaining an overall steady state (84–91 μW/cm2) in the 10%–97% RH range. The use of the measurement and modeling techniques demonstrated in this study may help understand various ambient conditions that influence the irradiance of UV-C and improve reliability and working performance of UVGI systems through better design.

Abstract Image

距离、温度和相对湿度对紫外线 C 型杀菌灯辐照度的影响:定量研究
紫外线杀菌照射(UVGI)作为一种针对病原微生物的工程控制手段,需要清楚地了解操作参数和环境对灭活率的影响。在此,我们使用 30 瓦低压汞灯在暗室中研究了紫外线-C(UV-C)辐照度在距离、环境温度和相对湿度(RH)条件影响下的变化规律,并对所有数据进行了曲线拟合分析。测量每个平面上的紫外线-C 辐照度时,距离在 0.5 至 1.2 米之间进行调整,并利用 70 μW/cm2 的阈值来计算有效辐照面积。对于温度和相对湿度,在环境温度从 15.5°C 升至 40°C、相对湿度从 10% 升至 97% 的情况下,在灯管中点垂直于灯管轴线 1 米处测量紫外线-C 辐照度。结果显示,紫外线-C 辐照度和有效辐照面积随着距离的增加而明显减小,两者都符合多项式二阶拟合。紫外线-C 灯在 20 摄氏度时工作效率最高。温度高于或低于最佳值都会降低紫外线输出,特别是当环境温度超过 38°C 时,辐照度会比观测到的最大值降低 16%。不过,相对湿度对辐射功率的影响可以忽略不计,在相对湿度为 10%-97% 的范围内,紫外线-C 辐照度总体保持稳定状态(84-91 μW/cm2)。使用本研究中展示的测量和建模技术,有助于了解影响紫外线-C 辐照度的各种环境条件,并通过更好的设计提高紫外光源照射系统的可靠性和工作性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Indoor air
Indoor air 环境科学-工程:环境
CiteScore
10.80
自引率
10.30%
发文量
175
审稿时长
3 months
期刊介绍: The quality of the environment within buildings is a topic of major importance for public health. Indoor Air provides a location for reporting original research results in the broad area defined by the indoor environment of non-industrial buildings. An international journal with multidisciplinary content, Indoor Air publishes papers reflecting the broad categories of interest in this field: health effects; thermal comfort; monitoring and modelling; source characterization; ventilation and other environmental control techniques. The research results present the basic information to allow designers, building owners, and operators to provide a healthy and comfortable environment for building occupants, as well as giving medical practitioners information on how to deal with illnesses related to the indoor environment.
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