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The Impacts of Indoor Thermal Parameters on Human Comfort and Health in Hospital Buildings

Author: GongZuo
Tutor: ZhangHuaLing
School: Chongqing University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: relative humidity pollutants comfort health grey relational analysis
CLC: TU831
Type: Master's thesis
Year: 2011
Downloads: 120
Quote: 0
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Abstract


Indoor air temperature and humidity affects not only the human comfort, but alsohas a great impact on health. It mainly affects human health and safety indirectly by itsinfluence on the indoor pollutant concentration. Especially to the hospital bhuding,comfortable and healthy indoor thermal and humidity environment are of greatsignificance for promoting the rehabilitation of patients and ensuring the health ofmedical staffs. This paper relys on the Chongqing Municipal Science and TechnologyCommission of Natural Science Foundation Program (CSTS,2010BB6052) to monitorthe concentration of indoor pollutants, thermal and humidity parameters in a hospital inChongqing in summer and winter air conditioning condition.Meanwhile we haveinvestigated indoor human thermal wet comfort conditions and adverse symptoms andestablished the humidity health impact evaluation system. We also have put forward thecomfortable and healthy air temperature and humidity range to reduce the indoorpersonnel hidden infection and provide reference data for the design and operation ofhospital buildings’ air conditioning system in Chongqing area.Firstly, the survey of thermal and humidity comfort was analyzed, includingpatients, healthy people in wards and waiting hall. Linear relationships between airtemperature and the thermal sensation votes, relative humidity and the humidityperception votes were established respectively. The thermal neutral temperature andappropriate relative humidity of different groups in different functional areas areobtained. Combined with the voting rates related to comfort, the comfortabletemperature and humidity ranges of typical hospital functional areas in the condition ofwinter and summer air conditioning. In winter, the comfortable ranges are20~23℃,17~20℃in temperature for the air condition in wards and waiting hall respective,and40%~60%in RH for both of them. In summer, the comfortable ranges are24~26℃,26~28℃in wards and waiting hall respective,and the comfortable ranges are both60%~80%.Secondly, studying on the microbiology, hygienics and epidemiology, thephysiology of dust mite, bacteria and fuangi and the physicochemical characters offormaldehyde and radon were presented,and also their health impact. The five pollutantsare the usual humidity related pollutants in hospital, and based on the field data of them,the sanitations in different functional areas were commended by pollution index. The effect sof environmental parameters on pollutants were summerised with Literaturereview and the field data. The result shows that the environment with RH<60%is fatalto dust mite, but when RH is above70%,the dust mites pollition is getting heavier.Indoor concentrations of fungi and formaldehyde are significant positive correlated withRH. The concentration of radon is significant negative correlated with RH in airconditioned RH range in winter.Finally, based on the pollutants concentration and the votes for adverse symptomsdegree in different relative humidity ranges, the humidity health impact evaluationsystem was established. The weights of pollutants’ health impact were calculated bygrey relational analysis and pollution index. In winter, the most humful to the less arefungi, bacteria, formaldehyde and radon; In summer the order is fungi, bacteria, dustmites, formaldehyde and radon. The humidity health impact was evaluated by thecombind pollutants indicators and adverse symptoms indicators. The integrated greyrelational grade was used to sequence the humidity ranges in terms of health hazard.In winter, the healthy RH ranges are40%~45%in wards, and45%~50%in waitinghall;in summer,they are65%~70%and60%~65%respective in wards and waiting hall.The health RH ranges also meet the comfort ranges. The humidity health impactevaluation system is propagable.

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