Impacts of Indoor Air Quality Using Underfloor Air Distribution System
Date Issued
2015
Date
2015
Author(s)
Lin, Chia-Yi
Abstract
The main objective of this study is to investigate concentration of carbon dioxide in room and analyze the change of its concentration field. The wind flow model uses the Eulerian viewpoint to simulate indoor airflow and conducts the Renormalization Group (RNG) κ-ε model of turbulent flows. In the simulation, we also use Boussinesq approximation to simulate the impacts of temperature to flow. The model of this study is verified by Tsai’s available field measurements in 2013, and we use the experimental room to set up two air distribution systems (1) Ceiling-Based Air Distribution (CBAD), (2) UnderFloor Air Distribution (UFAD), and compare these two systems for (1) cooling efficiency of the indoor environment, (2) carbon dioxide removal efficiency. We also discuss the impacts of the change of air temperature to flow field under non-isothermal condition (temperature of the air from inlet is less than temperature in chamber) and isothermal condition (temperature of the air from inlet is equal to temperature in chamber). The results of this study show that UFAD under non-isothermal condition has the best efficiency of cooling and carbon dioxide removal. Otherwise, CBAD under non-isothermal condition is the worst.
Subjects
Renormalization Group κ-ε model
Boussinesq approximation
UnderFloor Air Distribution
non-isothermal condition
isothermal condition
Type
thesis