Numerical investigation of indoor air quality in a floor heated room with different air change rates
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Numerical investigation of indoor air quality in a floor heated room with different air change rates
Bursa Uludag University, Vocational School of Yenisehir Ibrahim Orhan, Air Conditioning and Refrigeration Tech. Program, 16900 Yenisehir, Bursa, Turkey
Abstract
Keywords
Nowadays, indoor air quality is no longer considered as providing thermal comfort. The pollutant concentration in the ambient air (CO2, O3, particulate matter, etc.) is an essential factor affecting
particle concentration,
both indoor air quality and human health negatively. Particle motion in a room is affected by air
floor heating,
movements caused by heating systems and infiltration and needs to be examined. Therefore, this study aims to explain how infiltration rates in a room with floor heating affect both thermal
air change rates
conditions and particularly the particle concentration and distribution. In this study, the discrete phase model (DPM) was used for particle tracking using commercial software ANSYS FLUENT. It was assumed that drag, lift, thermophoretic and Brownian forces were affecting particle motions. It was seen that air change rates influence both thermal comfort and energy consumption as well as particle distribution significantly. It was found that increasing air change rates causes a rise in
Research Article
Mustafa Mutlu ()
indoor air quality,
Article History Received: 12 December 2019 Revised: 18 June 2020 Accepted: 20 June 2020 © Tsinghua University Press and
particle concentration in all sizes of particles, specifically for the lower parts of the room (below
Springer-Verlag GmbH Germany,
0.75 m from the floor). It is recommended to place air purifying devices where the outdoor
part of Springer Nature 2020
sourced air infiltrates the room. Additionally, an index that contains thermal comfort and particle concentration together was defined and its distribution in the room was examined. It is found that the air change rate is a critical factor in obtaining desired indoor air quality, but outdoor air conditions may worsen the indoor quality due to air pollution. As the air change rate significantly alters the airflow in the room, both thermal comfort perception and particle concentrations vary considerably.
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Introduction
E-mail: [email protected]
Indoor/Outdoor Airflow and Air Quality
People spend most of their time indoors as a result of city life. Due to much time is spending in enclosed places such as office, school and houses should be continuously monitored in terms of both work efficiency and human health and appropriate comfort conditions should be provided. The World Health Organization reports that pollutants in indoor environments have a severe impact on human health (WHO 2010). The most critical parameter affecting the distribution and concentration of pollutants in a room during winter conditions is the systems used for heating purposes and ventilation (Nazaroff 2004; Nõu and Viljasoo 2011; Golkarfard and Talebizadeh 2014; Zhou et al. 2017; Dehghan and Abdolzadeh 2018). Heating m
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