After that, the air flow on the lamps are modelled and particle motion simulation is carried out with the DPM model. The radiation intensity around the lamps in the channel is evaluated by the using discrete ordinates method depending on the location. In square duct, Lamps has 75 W UV power and their electrical efficiency depends on UV radiation generation, lamp surface temperature, contact air humidity, lamp working hours, lamp surface pollution. Simulations are conducted with commercial computational fluid dynamics solver ANSYS-FLUENT. Air flow in the duct has 3000 m3/h volumetric flow rate. Also an UV reactor design is investigated for high resistive microorganisms. In this study, four germicidal UV-C lamps that are in a 600圆00 square duct are numerically investigated. UV-C disinfection, germicidal lamp, computational fluid dynamics, indoor air quality Abstract The air sanitizers are believed to have a virus inactivation rate of 99.9%.Ī natural air change ACH of 0.35 is assumed for the reference case.Ege University | Solar Energy Institute | Turkeyĭepartment of Energy Systems Engineering | İzmir Institute of Technology | Turkey Dabish et al, "The influence of temperature, humidity and simulated sunlight on the infectivity of SARS-CoV-2 in aerosols", Aerosol Science and Technology, Volissue 2 The calculator is based on the following publication: The natural virus decay was calculated for 20 ° C, RH 30% and UV index 0 with the computer of the Department of Homeland Security and determined with D50 = 2.72h. However, the relative reduction in the risk of infection by an air purifier does not change as much.Įnvironment International, Volume 141, 2020, 105794, ISSN 0160-4120. The probability of infection varies greatly depending on the input parameters cv, ci and Qb. Please note that cv varies greatly depending on the individual and the time of infection. Qb depending on the activity (tidal volume) - standard value 0.54 m³ / h ci 0.05 (ratio between the infectious quantum and the infectious dose, expressed in viral RNA copies) cv 5.0E + 08 (viral load in sputum, viral RNA copies / ml) The following modeling input parameters were used: Buonanno et al, University of Cassino and Südlazio. The virus quantum model was taken from "Estimation of airborne viral emission": Quanta emission rate of SARS-CoV-2 for infection risk assessment "by G. Kriegel et al, Hermann Ritschel Institute, Technical University Berlin. The calculation of the virus concentration and the likelihood of infection follows the work "Predicted infection risk for aerosol transmission of SARS-COV-2" by Prof. The Federal Environment Agency recommends an air change rate of 6 (school) for schools regardless of the number of people in the classroom. Our recommendation is based on the ventilation rate for an expectation of category II air quality. The recommendation is based on Table C.4 in EN 16798-2 Overall Energy Performance of Buildings - Ventilation of Buildings. In addition, we recommend a minimum air flow rate of 25m³ / h and person, regardless of the size of the room. The risk of infection is increased in rooms that are visited by a large number of different people within a day (meeting rooms, waiting rooms, etc.) and we recommend an air exchange rate of 4 (increased safety). We recommend an air exchange rate of at least 2.5 (standard) The air exchange rate is defined as the total air throughput of the devices divided by the room volume. Recommendation for the number of devices: The recommendation is based on the one hand on the desired air exchange rate and on the other hand on the number of people in the room and depends on the use of the room. It is assumed that the room air is 100% virus-free at time 0. The calculation is based on the scenario that exactly one person is infected in the room and stays with other people in the room for a period defined by the tool user. The UVC air purifier calculator provides instructions on which device to use and which amount is recommended for a room.
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