Hygienic Status of Central Air Conditioning Ventilation System in Public Places Assessed by Fuzzy Comprehensive Evaluation Method

Objectives To assess the hygienic status of central air conditioning ventilation system in public places of a city in 2011-2012.

Methods A fuzzy comprehensive evaluation method was applied to evaluate the hygienic status of central air conditioning ventilation system, including fresh air system, air supply system, air duct system, cooling system, and engine room. A fuzzy comprehensive index was calculated and ranked.

Results Comparing the hygienic status in 2012 with that in 2011, the fresh air system, air supply system, air duct system and engine room were greatly improved (P < 0.05), but the cooling system was worse (P≤0.05); the fuzzy comprehensive indexs and the comprehensive ratings were significantly different (P < 0.05). The average rank of the fuzzy comprehensive index in 2012 and 2011 was 120.55 and 93.74, respectively. The hygienic status of central air conditioning ventilation system in 2012 was better than that in 2011 (P < 0.05).

Conclusions The overall hygienic status of central air conditioning ventilation system in 2012 was significantly improved, but the hygienic status of the cooling system was worse in comparison with that in 2011.Strengthening the prevention and control of pollution in cooling system are of importance.