Open AccessNumerical simulation of thermal stratification and air quality in an underfloor air distribution system (UFAD)
Author(s) -
Neil Stephen Lopez,
Selena Kay Galeos,
Brian Raphael Calderon,
David Roy Dominguez,
Bryan Joseph Uy,
Rupesh Iyengar
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/463/1/012021
Subject(s) - plenum space , stratification (seeds) , environmental science , marine engineering , thermal comfort , natural ventilation , meteorology , thermal , engineering , automotive engineering , ventilation (architecture) , mechanical engineering , geography , seed dormancy , botany , germination , dormancy , biology
The penetration of underfloor air distribution systems (UFAD) in residential and commercial air conditioning has been rather slow. The most notable applications would be on data centers, where thermal stratification requirements are more demanding. The present study supports and strengthens recent work in the design and development of UFAD systems, by augmenting literature on proper vent positioning and design. In UFAD systems where thermal stratification is more pronounced, significant energy savings may be achieved through proper positioning of supply and return vents. Using a validated numerical simulation model in ANSYS CFX, four UFAD vent layouts are investigated with regards to their implications on thermal stratification and indoor air quality. Results show that not only ventilation layout, but also vent type selection can significantly affect the performance of a UFAD system. Spreading multiple, smaller supply diffusers is preferable than having large supply diffusers on the perimeter of the rooms, both from a temperature distribution and indoor air quality perspective. Notably, air flow is significantly poor in the perimeter layout, causing warmer temperature at the center of the room.