Thermal Inactivation of Airborne SARS-CoV-2 by an Electric Fan Heater in Winter and Defining Conditions to Ensure That All the Air Passes Through the Fan
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS(2024)
摘要
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is spread, especially in closed environments, by airborne transmission. The study aims to assess the thermal inactivation of airborne SARS-CoV-2 in a 30 m(3) test room as a function of outlet temperature, airflow rate, and operating time of an electric heater, then define a condition to ensure that all air in the room passes through the electric heater. Aerosolized SARS-CoV-2 was delivered to the test room at an ambient temperature of 20 degrees C and 40% humidity. Two electric heaters with different powers and airflow rates were operated respectively in the test room to compare their efficiencies in the inactivation of airborne SARS-CoV-2. The first and second electric heaters had power, airflow rates, and outlet temperatures of 1.5 kW, 44 m(3)/h, 220 degrees C, and 3 kW, 324 m(3)/h, and 150 degrees C, respectively. A fan drew the outside air into the heater. In the first experiment, a 1.5 kW electric heater was operated in the test room for 80 min. In the second experiment, a 3 kW electric heater was used in the test room for 75 min. Airborne SARS-CoV-2 in the test room was inactivated by 99.00% and 99.96% in the first and second experiments, respectively. A condition is defined to ensure that all the air in the room passes at least once through the electric heater fan.
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关键词
airborne SARS-CoV-2,COVID-19,thermal inactivation,electric heater,winter,air pathogen purifier,biotechnology,energy efficiency,experimental techniques
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