Fluid dynamic and thermal comfort analysis in an actual operating room with unidirectional airflow system
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Fluid dynamic and thermal comfort analysis in an actual operating room with unidirectional airflow system
1. Dipartimento di Ingegneria, Università degli Studi di Napoli “Parthenope”, Centro Direzionale, Isola C4, 80143 Napoli, Italy 2. Institute of Thermal Technology, Silesian University of Technology, Konarskiego 22, 44-100 Gliwice, Poland
Abstract
Keywords
Air velocity and temperature distributions inside operating rooms (ORs) play a crucial role to reduce the risk of infections and to ensure adequate comfort conditions for patient and medical staff. In this work, the authors have developed a three-dimensional thermo-fluid dynamic model
heat and mass transfer,
to simulate airflow and thermal comfort in an actual OR equipped with High-Efficiency Particulate Air (HEPA) filters. The model takes into account the presence of surgical lights, people and
LAF system,
equipment within the room. An experimental campaign is carried out inside the actual OR to measure velocity and temperature, to be employed as boundary conditions for the numerical model. The experimental data have also been used to validate the numerical results. The validated model has been used to analyze the effects of human shape, thermal boundary conditions and buoyancy forces on the main thermal and fluid dynamic quantities in the OR. The thermal comfort
Research Article
Nicola Massarotti1, Alessandro Mauro1 (), Salahudeen Mohamed1, Andrzej J. Nowak2, Domenico Sainas1
thermal comfort, operating room, human body, validation
Article History Received: 18 May 2020 Revised: 03 August 2020 Accepted: 17 August 2020
is evaluated based on Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) indices. The results prove that the present experimental-numerical approach is useful to analyze
© Tsinghua University Press and
and improve the thermal comfort conditions for medical staff and patient.
Springer-Verlag GmbH Germany, part of Springer Nature 2020
1
Introduction
E-mail: [email protected]
Indoor/Outdoor Airflow and Air Quality
Operating rooms (ORs) represent the environment inside healthcare buildings that require the greatest deal of attention in terms of heating, ventilation and air conditioning (HVAC) systems, in order to reduce the risk of infection for patients and medical staff, and to maintain adequate thermohygrometric conditions to ensure comfort (Chow and Yang 2003). HVAC systems are generally designed on the basis of technical standards and common practice, with most of recent advancements being tested in experimental set-up chambers or lab controlled environments (ISO14644-1 2015; ISO14644-2 2015; DIN-1946-4 2016). The choice of the ventilation system is very important, in fact, Surgical Site Infections (SSIs) occur in 2.9% of all surgical operations, carried out conventionally in ORs, as estimated by Knobben et al. (2006). Nobile et al. (2015) reported that in orthopaedic and trauma surgery patients, SSI is associated with additional medical costs of €32000,
related to uninfected patients,
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