Résumé
Objective In order to investigate and evaluate the heating-ventilating-air conditioning (HVAC) systems in the public areas and therefore provide the support for the hygiene management. Methods According to Hygiene Criterion of HVAC System, 10 HVAC systems in 10 star grade hotels in Nanchang were selected and PM10 and the total count of aerobic bacterial in the air condition systems, the collected dust weight and the total count of aerobic bacterial in the dust in the inner surface of ventilation vessels, the legionella bacteria in cooling tower water were determined. Results The HVAC systems in the 10 hotels, 90.1% for the PM10 and 73.3% for the total count of aerobic bacterial in the air condition systems, 8.9% for the collected dust weight and 86.7% for the total count of aerobic bacterial in the dust in the inner surface of ventilation vessels were over the standard limits, the legionella bacteria were detected in two of the investigated HVAC systems cooling tower water. Conclusion The hygienic problems are existed in the ventilated systems in the air conditioners in the pubic places.The health supervision and monitoring must go on enhancing.
Résumé
Objective To investigate the pollution status of heating-ventilating-air conditioning(HVAC) systems in Shenyang public place. Methods The dust samples were collected and examined from the HVAC system in twelve hotels and ten shopping malls in Shenyang in March-June, 2004. Results Among HVAC systems in Shenyang public buildings, 71.51% of them were moderately polluted and 27.37% were seriously polluted. The rate of serious pollution of hotels was higher than that of shopping malls, the volume of dust in the air pipes in hotels was lager, but the amount of bacteria and fungi was less than that of shopping malls. Conclusion The HVAC systems of Shenyang public buildings have been seriously polluted.
Résumé
Objective To investigate the actual pollution status of heating-ventilating-air conditioning(HVAC) systems in five-star grade hotels in Beijing. Methods Seven sets of centralized HVAC system from five five-star grade hotels in Beijing were selected for sampling monitoring and videotaping in situ from August 2003 to October 2003. Results There were six sets HVAC systems seriously polluted and one set was in moderately polluted according collected dust weight. The total counts of bacteria in the dust were in medium pollution grade in four sets of HVAC systems; The total quantity of fungus in the dust were in medium pollution grade in five sets of HVAC systems; The video materials showed that inside the air duct there were fungus, construction rubbish and deposit of large quantity of dust. Conclusion The HVAC systems of those five hotels were seriously polluted.