![]() ![]() h km −3), and equipment costs (1,500–3,000 CNY), making it potentially cost-effective for air disinfection in HVAC systems. ![]() Besides the disinfection stability, the combination process has advantages in pressure drop (around 50 Pa), energy consumption (e.g., 0.115 kW Since the UV 185+254 disinfection was more effective than that of UV 254, the UV 185+254-based combination could further enhance the B.subtilis var. niger, the combination process improved the disinfection efficiency to 82 % at 16 ± 2 ☌ and the airflow rate of 2.4 m s −1, while UV 254 was only 52.9 %. Especially for the relatively stubborn B.subtilis var. Its combination with micro-static electricity could remarkably overcome these adverse factors and realize efficient disinfection within the retention time of 0.21 s. UV 254 could efficiently disinfect S.albus (>99 %) at high temperatures (31 ± 2 ☌) and low airflow rates (1.2 m s −1) but was weakened at lower temperatures and higher airflow rates. To satisfy the high efficiency, superspeed, and wide temperature range of HVAC air disinfection, UV irradiation (UV 254/ UV 185+254) and its combination with micro-static electricity were studied in two full-scale ducted ventilation systems. The increased threats of pathogenic bioaerosol make air disinfection in heating, ventilation, and air conditioning (HVAC) systems crucial to occupants’ health.
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