| The outdoor climate conditions of Yongshu Reef in the South China Sea Island have typical marine climate characteristics of high temperature,high humidity,salt fog,strong solar radiation and long sunshine time.The high temperature and high humidity air infiltrates from the outdoor to the indoor.When the mould spores spread in the room and deposited on the wall surface through air flow,human and animal activities and other ways,the residual heat and humidity inside the enclosure structure make the wall become hotbed of mould.The mould pollution damages the building structure,affects the beauty,and has a negative impact on the indoor environment quality,human health and national economy.In this paper,the critical values of temperature and humidity of indoor mould growth in Nanhai Reef buildings are discussed by the way of literature review,questionnaire survey,numerical simulation and experiment.The critical lines of temperature and humidity of indoor air conditioning for mould growth under different air conditioning conditions of different enclosure structures are drawn,and two optimal design schemes for mould pollution prevention are proposed.In this study,the original meteorological parameters of Yongshu Reef were processed,the outdoor climate conditions were analyzed to be characterized by high temperature,high humidity,strong solar radiation,etc.Through literature review,it was judged that the dominant fungi species in the interior wall surface and air of buildings in countries and regions around Yongshu Reef were Aspergillus,Penicillium and Cladosporium,so do Yongshu Reef.The determination of dominant species provides a reference for selecting the mould growth prediction model,which is the theoretical basis of WUFI series software.A questionnaire survey was conducted to investigate the mould pollution of civil buildings in South China Sea Island.The results showed that the mould pollution is very serious,which mainly occurred from April to October.There was a strong correlation between the mould pollution and human respiratory diseases and asthma.The important factors affecting the mould pollution were the indoor water leakage,water seepage,the humidity of building materials and poor ventilation.After the questionnaire survey of different enclosure types and air conditioning behaviors of residents,the hourly temperature and humidity parameters of the inner and inner surfaces of the wall are calculated by the WUFI-Plus software,and input to the WUFI-Bio software to predict the annual growth of wall mould.Combined with a total of 14180 groups mould growth data under different conditions,it can be used to deduce the indoor temperature and humidity parameters to prevent mould pollution,and draw out the critical line of temperature and humidity in the air conditioning room.The wall structure includes reinforced concrete pouring structure,reinforced concrete block structure,brick wall structure,wood wall structure and coral aggregate block structure.The air conditioning condition includes natural ventilation condition,night air conditioning condition,day air conditioning condition and all day air conditioning condition.And then analyze the influence of salt fog environment on this critical line,which provides data reference for the indoor design parameters of air conditioning in the angle of mould prevention in marine climate.Based on the critical line of temperature and humidity,two optimal design schemes of mould prevention for different air conditioning conditions are proposed:(1)Temperature control scheme for all day air conditioning condition: according to the experiment results and simulation data,in the temperature range of 24-28?,when the relative humidity is 40%-80%,the influence of temperature factor on the growth of dominant mould is greater than that of relative humidity,when the relative humidity is 80%-90%,the influence of relative humidity factor on the growth of dominant mould is greater than that of temperature,therefore,it is suggested to increase dehumidifier equipment under the condition of over 80% humidity,and control temperature under the condition of 40%-80% humidity.Combined with the experimental and simulation data analysis,it is concluded that the air conditioning variable temperature control scheme instead of constant temperature control scheme can effectively reduce the risk of indoor mould pollution.(2)Ventilation control scheme for night air conditioning condition and day air conditioning condition: for the ventilation period of a year,the day ventilation scheme should be given priority.For the ventilation volume in air conditioner service season,the minimum air supply volume specified in the design code should be adopted.For the ventilation volume in the transition season,even if the outdoor is in the high temperature and humidity environment,the mechanical ventilation can effectively remove the indoor residual humidity and reduce the mould pollution under the small ventilation volume(<2 times/h).When the wind speed is too high,the measures of reducing the window area or reducing the ventilation time should be taken to reduce the indoor and outdoor air exchange,so as to maintain the indoor air temperature and humidity at a relatively stable level.The optimized design scheme can be used for reference in the daily life of mould prevention for the residents of Nanhai island. |
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