Effects of Radiant Floor Heating Integrated with Natural Ventilation on Flow and Dispersion in a Newly Decorated Residence

Peng-Yi Cui (), Jia-Qi Wang, Feng Yang, Qing-Xia Zhao, Yuan-Dong Huang (), Yong Yang and Wen-Quan Tao
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Peng-Yi Cui: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Jia-Qi Wang: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Feng Yang: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Qing-Xia Zhao: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Yuan-Dong Huang: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Yong Yang: College of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou 215000, China
Wen-Quan Tao: School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

IJERPH, 2022, vol. 19, issue 24, 1-22

Abstract: To date, few studies have been conducted on the characteristics of flow and dispersion caused by indoor radiant floor heating integrated with natural ventilation. In this study, we employed reduced−scale numerical models validated by wind−tunnel experiments to investigate the influence of radiant floor heating integrated with natural ventilation on airflow, heat transfer, and pollutant dispersion within an isolated building. The Richardson number ( Ri ) was specified to characterize the interaction between the inflow inertia force and the buoyancy force caused by radiant floor heating. Several Ri cases from 0 to 26.65, coupled with cross− or single−sided ventilation, were considered. Model validation showed that the numerical model coupled with the RNG k - ε model was able to better predict the indoor buoyant flow and pollutant dispersion. The results showed that the similarity criterion of Ri equality should be first satisfied in order to study indoor mixed convection using the reduced−scale model, followed by Re −independence. For cross−ventilation, when Ri < 5.31, the incoming flow inertia force mainly dominates the indoor flow structure so that the ACH, indoor temperature, and pollutant distributions remain almost constant. When Ri > 5.31, the thermal buoyancy force becomes increasingly important, causing significant changes in indoor flow structures. However, for single−sided ventilation, when Ri > 5.31 and continues to increase, the buoyancy force mainly dominates the indoor flow structure, causing a significant increase in ACH, thus reducing the indoor average temperature and pollutant accumulation.

Keywords: numerical simulation; radiant floor heating; natural ventilation; indoor air quality; pollutant dispersion (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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