Comparative research on the air pollutant prevention and thermal comfort for different types of ventilation

Zhang, Yang; Yu, Wang; Li, Youli; Lai, Han

doi:10.1177/1420326x20925521

Cited by 14 publications

(11 citation statements)

References 43 publications

(40 reference statements)

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“…Two seconds of inhalation, 2 s of expiration, and 1 s of pause were used in each trial's breathing cycle (Figure 4B). With a pulmonary ventilation rate of (6 L/min) for each breath, the breathing rate was roughly (12) breaths per minute. (0.51/2 s = 0.25 L/s = 15 L/min) was used to compute the instantaneous flow.…”

Section: Thermal Manikinmentioning

confidence: 99%

“…10,11 The system (CC/MV) also works with a central control system to maintain a unified indoor environment in the occupied area, and this cannot satisfy all passengers as air is provided from a distance from the passengers and is mixed with polluted room air before entering the breathing areas of people. 12,13 Several review studies have demonstrated that there is strong and sufficient evidence for most diseases to establish the link between ventilation and air movement in buildings and the spread of pathogens such as SARS, highlighting the importance of indoor environmental control. 14 As a result, personal ventilation has the potential to achieve efficient air distribution that delivers clean air directly to the breathing areas and allows individual microclimate control at each workstation.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study for comparison of thermal comfort and air age between two combined ventilation systems with chilled ceiling considering occupant density

Nayyef

Mahdi

2023

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Due to the global spread of diseases and epidemics, the need to maintain a clean indoor atmosphere has received increasing attention in recent years. Therefore, there will be a need to clearly estimate and define the areas that affect human exposure to pollutants, taking into account the occupied density, which is the primary importance of this research. The capacity of the chilled ceiling combined with mixing ventilation and personal ventilation systems has been studied and compared to the chilled ceiling with mixing ventilation in terms of mean air age, temperature distribution, CO2 concentration, and thermal efficiency, with the best flow rate of the proposed system considering the occupied density in a thermally insulated office room experimentally in the climate of Iraq (Hilla, a hot and dry climate). Twelve tests were performed for four different cooling loads with cooled ceilings (0%, 0.25%, 50%, and 80%), at a constant supply air flow rate with two PV airflow modifiers for three cases. As the cooling load treated by a chilled ceiling increased, the average air temperature increased with height in all cases. The lowest values of average air age appeared in the occupied area in the case of a chilled ceiling with mixing ventilation. This study shows that the chilled ceiling combined with a mixing ventilation and personal ventilation system with a flow rate of 7.5 L/s provides thermal comfort and higher air quality in the occupied area. based on the values of air exchange efficiency and occupants’ air exchange efficiency. As a result, a flow rate of 7.5 L/s is the best option for protecting occupants from direct pollution in the breathing zone and in the surrounding microclimate, because the lower the ventilation rate, the less air is changed for occupants.

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Section: Thermal Manikinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study for comparison of thermal comfort and air age between two combined ventilation systems with chilled ceiling considering occupant density

Nayyef

Mahdi

2023

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“…according to the aerodynamic characteristics and the temporal and spatial distribution of viruses and other pollutants in the air [51] . Airflow affects the sedimentation and diffusion of virus and other pollutants [52][53] . Not only can proper ventilation and good outdoor air proveto reduce the transmission of indoor pollutants and viruses through the air [54] , but also reasonable building space organization will effectively reduce the transmission of viruses in the community [55] .…”

Section: Design Mode--healthy Wind Environment In Buildingsmentioning

confidence: 99%

Standards and Problems for Epidemic Prevention in Buildings: A Systemic Review

Gong

Lei

Bu³

et al. 2022

Jounarl of Building Design and Environment

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The complexity of the building environment directly affects the spread of the SARS-CoV-2 inside the building. Therefore, the paper systematically reviewed the effective and feasible measures, designs and relevant epidemic prevention guidelines formed in the eld of epidemic prevention during the period of COVID-19, as well as the excellent research and projects around the world. The study found that most of the people infected with COVID-19 were infected indoors, but the current building design was not included in the scope of epidemic prevention design, not effectively resist the spread of infectious diseases, and there is no standard guideline for epidemic prevention building design so far. Therefore, it is necessary to formulate building epidemic prevention standards, and by considering the epidemic prevention design in the architectural planning and design stage, the use of building epidemic prevention products, healthy wind environment design, etc. to establish a healthy building environment can effectively reduce the risk of epidemic transmission inside the building. However, due to insufficient epidemiological data and pathological research on the risk of epidemic transmission among residents, further research on the standards for epidemic prevention and quantitative risk assessment methods of building is limited.

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“…Conventional ventilation systems are designed to dilute indoor-contaminated air through intruding fresh air from the outside, maintaining indoor air quality and thermal comfort at a satisfactory level. 13 There are two categories of ventilation systems according to different driving forces: natural ventilation systems and mechanical ventilation systems. 14,15 However, due to the shortfall in the stable wind pressure, natural ventilation systems are usually used for auxiliary purposes.…”

Section: Engineering Control Against Virus Spread With Ventilation Symentioning

confidence: 99%

HVAC systems for environmental control to minimize the COVID-19 infection

Ding

Yu²,

Cao

2020

Indoor and Built Environment

113

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The outbreak of pneumonia caused by 2019 Novel Coronavirus arises significant concern for virus transmission and control. The control of the indoor environment or public-enclosed environment is crucial to reduce the risk of infection. Heating, ventilation, air-conditioning (HVAC) systems are used to create a healthy, thermal-comfort indoor environments. Thus, the rational use of HVAC systems is of great importance for the environmental control to reduce infection risk and to improve human wellbeing in the pandemic. In order to satisfy the requirement of better healthy environment and more thermal comfort performance of indoor ventilation system, prevention of indoor pollution is essential, especially considering the purpose of disease transmission resistance. This paper investigated the collective contagion events in enclosed spaces as well as engineering control against virus spread with ventilation systems for health-care facilities and public vehicles. Future challenges of HVAC design and control were discussed.

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Comparative research on the air pollutant prevention and thermal comfort for different types of ventilation

Cited by 14 publications

References 43 publications

Experimental study for comparison of thermal comfort and air age between two combined ventilation systems with chilled ceiling considering occupant density

Experimental study for comparison of thermal comfort and air age between two combined ventilation systems with chilled ceiling considering occupant density

Standards and Problems for Epidemic Prevention in Buildings: A Systemic Review

HVAC systems for environmental control to minimize the COVID-19 infection

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