Abstract
The microbial contamination of central air conditioning system is one of the important factors that affect the indoor air quality. Actual measurement and analysis were carried out on microbial contamination in central air conditioning system at a venue in Dalian, China. Illumina miseq method was used and three fungal samples of two units were analysed by high throughput sequencing. Results showed that the predominant fungus in air conditioning unit A and B were Candida spp. and Cladosporium spp., and two fungus were further used in the hygrothermal response experiment. Based on the data of Cladosporium in hygrothermal response experiment, this paper used the logistic equation and the Gompertz equation to fit the growth predictive model of Cladosporium genera in different temperature and relative humidity conditions, and the square root model was fitted based on the two environmental factors. In addition, the models were carried on the analysis to verify the accuracy and feasibility of the established model equation.
Highlights
The microbial contamination of central air conditioning system is one of the important factors that affect the indoor air quality
H1N1, SARS and other popular virus spread[12,13], and some researches showed that the hygienic, reasonable air conditioning systems were important to reduce damage[14,15]
Microbial pollution in central air conditioning system has become a critical topic in the field of indoor air pollution
Summary
The microbial contamination of central air conditioning system is one of the important factors that affect the indoor air quality. Actual measurement and analysis were carried out on microbial contamination in central air conditioning system at a venue in Dalian, China. Studies showed that air handing unit is an important source of microorganisms for indoor biological pollution, and some microorganisms tend to stay in the dust of air conditioning units with the appropriate temperature and humidity environment. National Institute for Occupational Safety and Health (NIOSH) conducted a study of 529 buildings, and the research results showed that among the sources of indoor air pollution, central air-conditioning system pollution accounted for 53%9. Summary of measurement by Professor Fanger showed that air-conditioning systems accounted for 42% in the indoor pollution sources[10].
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