Investigation of dust loading and culturable microorganisms of HVAC systems in 24 office buildings in Beijing
Investigation of dust loading and culturable microorganisms of HVAC systems in 24 office buildings in Beijing
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DOI：
10.1016/j.enbuild.2015.06.056
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发表时间：
2015-09-15
影响因子：
6.7
通讯作者：
Li, Hao
中科院分区：
文献类型：
--
作者：
Liu, Zhijian;Zhu, Zunqiang;Li, Hao
为研究北京市24栋办公楼空调系统的粉尘负荷和可培养微生物污染特性，对空调系统回风、新风、混合风、冷却风和送风等部分进行了温度、相对湿度、风速、粉尘负荷、可培养菌/菌负荷等一系列现场测试。在这些测量结果的基础上，计算每克粉尘的可培养真菌/细菌数量，并鉴定出主要的可培养真菌/细菌种类。统计分析表明，粉尘载量范围为3.25-48.25 g/cm ~ 2，可培养菌/菌载量范围为32-221 CFU/cm ~ 2，每克粉尘可培养菌/菌数范围为46-232 CFU/cm ~ 2，每克粉尘可培养菌/菌数范围为53，815 ~ 124，807 CFU/g，每克粉尘可培养菌/菌数范围为63，395 ~ 10，383 CFU/g。粉尘载量和可培养菌/菌载量的最大值出现在新风段。主要可培养真菌为青霉属、曲霉属、枝孢属和链格孢属，主要可培养细菌为微球菌属、芽孢杆菌属、葡萄球菌属和假单胞菌属。粉尘与可培养真菌载量、粉尘与可培养细菌载量、每克粉尘可培养真菌数与相对湿度、每克粉尘可培养细菌数与温度均呈显著正相关（p < 0.05）。这些现场测量的结果表明，灰尘积累和/或高湿度和/或温度应适当控制在HVAC系统，以防止可培养的真菌和细菌的生长。(C)2015 Elsevier B. V.版权所有。
To investigate the dust loading and culturable microorganisms contamination characteristics of HVAC systems in 24 office buildings, a series of field tests, which included temperature, RH, air velocity, dust loading, culturable fungi/bacteria loading, were conducted in the following: return air, fresh air, mixture air, cooling, and supply air segments. On the basis of these measuring results, the culturable fungi/bacteria number per gram dust was calculated and the predominant culturable fungi/bacteria species was identified. Statistical analysis showed that dust loading, culturable fungi/bacteria loading, culturable fungi/bacteria number per gram dust were in the range of 3.25-48.25 g/cm(2), 32-221 CFU/cm2, 46-232 CFU/cm(2), 53,815-124,807 CFU/g(dust), and 63,395-10,383 CFU/gdust respectively. The maximum value for dust loading and culturable fungi/bacteria loading appeared in fresh air segments. The predominant culturable fungi were Penicillium, Aspergillus, Cladosporium, and Alternaria and the predominant culturable bacteria were Micrococcus, Bacillus, Staphylococcus, and Pseudomonas. There were significant positive correlations between dust and culturable fungi loading, dust and culturable bacteria loading, culturable fungi number per gram dust and RH, bacteria number per gram dust and temperature (p < 0.05). Results of these field measurements indicated that dust accumulation and/or high humidity and/or temperature should be properly controlled in HVAC systems to prevent the growth of culturable fungi and bacteria. (C) 2015 Elsevier B.V. All rights reserved.