Publication: Influence of the air renovation rate on the risk of cross infections in a hospital room with a combined radiant and mixing ventilation system
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Date
2016
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info:eu-repo/semantics/openAccess
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Department of Civil Engineering, Aalborg University
Abstract
This study aims to test how mixing ventilation combined with a hydronic radiant floor system performs removing airborne exhaled contaminants using two different air renovation rates. The two selected renovation rates are 2 ACH and 7.5 ACH. Temperature and velocity probes are used to evaluate temperature and velocity profiles in the room. A tracer gas (CO2) is used to measure the risk of cross infection between two breathing thermal manikins. One of the manikins (P) represents a lying person over a horizontal surface and its breathing represents the only source of contaminants into the chamber. The other one (HW) represents a standing person near P. The concentration of exhaled contaminants reaching its
breathing zone is studied. Temperature and air velocity profiles show that a nearly completely air stability situation is reached at the occupied zone. This stability is influenced by the air renovation rate performed. Tracer gas measurement results show a similar distribution of exhaled contaminants but with some discrepancies for both tests conducted. A higher tracer gas concentration reaches the nearby zone of HW manikin when the air renovation rate is increased from 2 to 7.5 ACH. This can lead to a higher cross infection rate. The obtained results suggest that that a higher ventilation rate not necessary leads to a decrease of the airborne cross infection risk for the occupants in an enclosed area.
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Keywords
airborne cross infection, breathing, hydronic radiant systems, ventilation
Citation
Berlanga, F. A., Olmedo, I., Ruiz de Adana, M., & Peci, F. (2016). Influence of the air renovation rate on the risk of cross infections in a hospital room with a combined radiant and mixing ventilation system. CLIMA 2016 - proceedings of the 12th REHVA World Congress, 1.
Center
Facultades y escuelas::E.T.S. de Ingenieros Industriales
Department
Mecánica