| Title |
Prediction of Stratification Model for Diffusers in Underfloor Air Distribution System using the CFD |
| Authors |
Jeong-Eun Son ; Byeong-Ho Yu ; Seung-Ki Pang ; Kwang Ho Lee |
| DOI |
https://doi.org/10.6110/KJACR.2017.29.3.105 |
| Keywords |
바닥공조시스템 ; 냉방 ; 온도 성층화 ; 디퓨저 ; 전산유체역학 UFAD ; Cooling ; Temperature Stratification ; Diffuser ; CFD |
| Abstract |
Underfloor air distribution (UFAD) is an air distribution strategy for providing ventilation and space conditioning in buildings. UFAD systems use the underfloor plenum beneath a raised access floor to provide conditioned air through floor diffusers that create a vertical thermal stratification during cooling operations. Thermal stratification has significant effects on energy, indoor air quality, and thermal comfort performance. The purpose of this study was to characterize the influence of a linear bar grille diffuser on thermal stratification in both interior and perimeter zones by developing Gamma-Phi based prediction models. Forty-eight simulations were carried out using a Computational Fluid Dynamics (CFD) technique. The number of diffusers, the air flow supply, internal heat gains, and solar radiations varied among the different cases. Models to predict temperature stratification for the tested linear bar grille diffuser have been developed, which can be directly implemented into dynamic whole-building simulation software such as EnergyPlus. |