| Title |
Analysis of Stratification Levels in Underfloor Air Distribution Systems According to Diffuser Conditions |
| Authors |
Sang Hun Yeon ; Kwang Ho Lee |
| DOI |
https://doi.org/10.6110/KJACR.2018.30.6.245 |
| Keywords |
바닥공조시스템 ; 성층화 ; 에너지플러스 ; 감마-파이 ; 급기구 UFAD ; Stratification ; EnergyPlus ; Gamma-Phi ; Diffuser |
| Abstract |
An underfloor air distribution (UFAD) system is an air conditioning system that enables the maintenance of indoor temperature with a relatively small supply-return air temperature gap and at a low supply air flow rate. UFAD offers a variety of advantages compared to conventional overhead systems, including improvements in comfort, health, work efficiency, indoor air quality, and ventilation efficiency for occupants, and improvements in life cycle cost decrease and lay-out flexibility for building services. In addition, using a UFAD system reduces the floor height because the duct space becomes unnecessary. A key factor for the improved energy performance of the UFAD system is stratification, which refers to the inconsistent vertical temperature distribution from the floor to the ceiling resulting from the buoyant effect of air. Stratification plays a critical role in determining the heat, ventilation, and energy performance of a system. However, based on a domestic literature review, research into the stratification of UFAD is insufficient, reflected by a lack of understanding of stratification and a lack of detailed research related to UFAD. Therefore, this study, by using the EnergyPlus simulation and Phi-Gamma formula, aims to assess variations in stratification according to diffuser condition. |