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首页> 外文期刊>Science and Technology for the Built Environment >Study the HVAC system photodegradation caused by the low level UVC light irradiance used for coil maintenance and air stream disinfection
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Study the HVAC system photodegradation caused by the low level UVC light irradiance used for coil maintenance and air stream disinfection

机译：研究了用于线圈维护和空气流消毒的低水平UVC光辐照度引起的HVAC系统光降解

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This paper studied the detrimental effects of low (50-750 mu W/cm(2)) level ultraviolet C (UVC) irradiation used for coil maintenance and air stream disinfection on the surfaces of different HVAC materials and components. Photoreactors were initially used to study low level UVC photodegradation of materials with the highest UVC susceptibilities and demonstrated that the rates/mechanisms of surface damage are highly dependent on the material processing history as well as polymer structure. Due to the low levels of damage after months of exposure (UVC damage equal in magnitude to surface roughness of polished surfaces), the low level UVC photoreactor results described herein were unable to establish a mathematical relationship between UVC irradiation level and photodegradation rate, especially for the less susceptible materials. However, the results did indicate that the UVC susceptibility rankings were unaffected by UVC irradiation levels, which indicated that high UVC irradiation levels are suitable for shortening the test times required to obtain sufficient surface photodegradation to rank the UVC susceptibilities of polymers/materials used in HVAC systems. To make the UVC susceptibility testing suitable for nonlaboratory settings, a test cell fixture designed to house a single sample, a variable power UVC LED, and an optical photodegradation measuring device was constructed and evaluated. The ability to run each test cell at a different UVC level by simply adjusting the LED input power level allowed multiple samples to be run simultaneously under a wide range of UVC levels/environmental conditions.
机译：本文研究了低（50-750μm（2））水平紫外线C（UVC）辐射用于线圈维持和空气流消毒在不同HVAC材料和部件的表面上的不利影响。最初用于研究具有最高UVC敏感性的材料的低水平UVC光降解，并证明了表面损伤的速率/机制高度依赖于材料处理历史以及聚合物结构。由于经过几个月的曝光后损伤的损伤水平低（抛光表面的表面粗糙度相等的UVC损伤），本文所述的低水平UVC光反应器结果不能在UVC照射水平和光降解率之间建立数学关系，特别是较差的易感材料。然而，结果表明，UVC易感性排名不受UVC辐射水平影响，这表明高UVC辐射水平适合于缩短获得足够表面光降解所需的测试时间，以对HVAC中使用的聚合物/材料的UVC敏感性等级进行排序系统。为了使UVC易感性测试适用于非制造设置，构建和评估设计用于容纳单个样品的测试单元固定装置，可变功率UVC LED和光学光降解测量装置。通过简单地调整LED输入功率电平在不同的UVC电平下运行每个测试单元的能力允许在广泛的UVC水平/环境条件下同时运行多个样本。

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