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Sistemi passivi per la riduzione del rischio di contagio aereo in edifici con ventilazione ridotta
Passive systems for reducing the risk of airborne infection in buildings with reduced ventilation


A. Cammarata1, G. Cammarata cammaratagiuliano@gmail.com2

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Abstract
Ways to reduce the risk of SARS-CoV-2 infection in existing buildings are based on the modification of HVAC systems (if present) and the use of indoor sanitization systems (with HEPA absolute filters or with the use of UV-C devices, with or without ionization). These sanitization methods have only recently been accepted as valid and effective by the "Istituto Superiore di Sanità". Together with the plant systems, which we can define as active systems, passive systems obtained with an appropriate rotation of indoor permanence are starting to be studied (Sheng Zhang, Zhengtao Ai, Zhang Lin, 2021, [1], G. Cammarata [2]). Active sanitization devices can also be added to these systems to further reduce the risk of infection in a sensitive and often decisive way. In this study we present a passive method of risk reduction with only alternating periods of reduced work (time step) and short breaks during which it is possible to make rapid changes of air and / or sanitize the surfaces possibly infected (fomites). The proposed study uses the method of Rudnick and Milton Dynamic, RMD, proposed by A. Cammarata, G. Cammarata, 2021, [3]) that allows to calculate the probability of contagion in a different way from the other methods used. In addition to the calculation of the risk of contagion, it is also possible to evaluate the environmental concentration of CO2, an important para- meter for air quality (IAQ) according to the indications of the EN 16788-1 standard.

Keywords
SARS-CoV-2
Passive protection
Reduced ventilation
Dynamic Rudnik Milton
Risk of contagion

DOI
10.36164/AiCARRJ.71.06.02

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