Thermal environment and air quality in office with personalized ventilation combined with chilled ceiling

Lipczyńska, Aleksandra; Kaczmarczyk, Jan; Melikov, Arsen Krikor

doi:10.1016/j.buildenv.2015.05.035

Cited by 78 publications

(67 citation statements)

References 29 publications

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“…The excellent performance of PV in reducing the risk of airborne infection in indoor spaces conditioned by various background ventilation methods has been widely documented in the literature, which suggests that PV can be a suitable supplement to traditional methods of infection control. The efficiency of PV in mitigating airborne transmission is influenced by the type of PV and the air terminal devices used .…”

Section: Current Understanding Of Airborne Transmission Indoorsmentioning

confidence: 98%

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Airborne spread of expiratory droplet nuclei between the occupants of indoor environments: A review

2018

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This article reviews past studies of airborne transmission between occupants in indoor environments, focusing on the spread of expiratory droplet nuclei from mouth/nose to mouth/nose for non-specific diseases. Special attention is paid to summarizing what is known about the influential factors, the inappropriate simplifications of the thermofluid boundary conditions of thermal manikins, the challenges facing the available experimental techniques, and the limitations of available evaluation methods. Secondary issues are highlighted, and some new ways to improve our understanding of airborne transmission indoors are provided. The characteristics of airborne spread of expiratory droplet nuclei between occupants, which are influenced correlatively by both environmental and personal factors, were widely revealed under steady-state conditions. Owing to the different boundary conditions used, some inconsistent findings on specific influential factors have been published. The available instrumentation was too slow to provide accurate concentration profiles for time-dependent evaluations of events with obvious time characteristics, while computational fluid dynamics (CFD) studies were mainly performed in the framework of inherently steady Reynolds-averaged Navier-Stokes modeling. Future research needs in 3 areas are identified: the importance of the direction of indoor airflow patterns, the dynamics of airborne transmission, and the application of CFD simulations.

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Section: Current Understanding Of Airborne Transmission Indoorsmentioning

confidence: 98%

“…The surface temperature range between different body segments was specified to be 29‐34.5°C . Light clothing with an overall thermal insulation ranging from 0.5 to 0.8 clo was widely used . The estimation of clothing insulation values usually followed ISO Standard 9920…”

Section: Thermofluid Boundary Conditions For Thermal Manikinsmentioning

confidence: 99%

Airborne spread of expiratory droplet nuclei between the occupants of indoor environments: A review

2018

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“…Yao et al studied the flow behavior of an isothermal impinging jet in a closed cabin, and improved the performance of the IJV M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 system by using a multi-scale analysis technique based on empirical mode decomposition [12]. Melikov et al developed the Personalized Ventilation (PV) to control the local building environment [13], and found that PV combined with chilled ceiling can protect occupants from the cross-infection [14]. Yang compared PV, MV and DV, and found PV systems have the potential to maintain a healthier environment at each workstation [15].…”

Section: Introductionmentioning

confidence: 98%

Experimental study on airflow characteristics of a square column attached ventilation mode

Yin

Liu

et al. 2016

Building and Environment

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“…In past studies 3-7,10-22 of airborne cross-infection during light activities carried out in a sitting and standing posture, the pulmonary ventilation rate was defined in a wide range, from 6.0 to 10.0 L/ min. In previous studies using breathing thermal manikins, a breathing cycle period of 6 seconds was usually assumed for a pulmonary ventilation rate of 6.0 L/min and 4 s for 10.0 L/min; the breathing cycle of 2.5 second inhalation, 2.5 second exhalation, and 1 second pause was most widely used, 11,12,30,31 although many studies used a cycle without a pause between exhalation and inhalation. 25 These velocities were in general higher than those measured in human subject studies, where the peak flow velocity during normal breathing was reported to be approximately 1-2 m/s.…”

Section: Introductionmentioning

confidence: 99%

“…25 These velocities were in general higher than those measured in human subject studies, where the peak flow velocity during normal breathing was reported to be approximately 1-2 m/s. In general, the pulmonary ventilation rate and breathing cycle period of "standard persons" were used in past studies [3][4][5][6][7][10][11][12][13][14][15][16][17][18][19][20][21][22]30,31,33 of airborne cross-infection. In previous studies using breathing thermal manikins, a breathing cycle period of 6 seconds was usually assumed for a pulmonary ventilation rate of 6.0 L/min and 4 s for 10.0 L/min; the breathing cycle of 2.5 second inhalation, 2.5 second exhalation, and 1 second pause was most widely used, 11,12,30,31 although many studies used a cycle without a pause between exhalation and inhalation.…”

Section: Introductionmentioning

confidence: 99%

Influence of pulmonary ventilation rate and breathing cycle period on the risk of cross‐infection

Hashimoto

Melikov

2019

Indoor Air

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This study examined the characteristics of the exhaled airflow pattern and breathing cycle period of human subjects and evaluated the influence of pulmonary ventilation rate and breathing cycle period on the risk of cross‐infection. Measurements with five human subjects and a breathing thermal manikin were performed, and the peak exhaled airflow velocity from the mouth and the breathing cycle period were measured. Experiments on cross‐infection between two breathing thermal manikins were then conducted in a full‐scale test room, in which the pulmonary ventilation rate and breathing cycle period were varied systematically. Both peak flow velocity and breathing cycle length varied considerably between different subjects. The breathing cycle period in a standing posture was 18.9% lower than in a sitting posture. The influence of pulmonary ventilation rate and breathing cycle period extended up to a separation distance of 1.0 m between the two manikins. Increasing the pulmonary ventilation rate of the exposed person greatly increased the risk of cross‐infection. Decreasing the breathing cycle period from the widely used “6 second” value led to a considerable increase in the risk of cross‐infection. Standing posture resulted in a higher risk of cross‐infection than sitting posture.

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Thermal environment and air quality in office with personalized ventilation combined with chilled ceiling

Cited by 78 publications

References 29 publications

Airborne spread of expiratory droplet nuclei between the occupants of indoor environments: A review

Airborne spread of expiratory droplet nuclei between the occupants of indoor environments: A review

Experimental study on airflow characteristics of a square column attached ventilation mode

Influence of pulmonary ventilation rate and breathing cycle period on the risk of cross‐infection

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