RT Journal Article
T1 Detailed and simplified models of a terminal unit that combines an UFAD system with a floor cooling
A1 Atienza-Márquez, Antonio
A1 Fernández-Hernández, Francisco Ángel
A1 Domínguez-Muñoz, Fernando
A1 Cejudo-López, José Manuel
K1 Edificios - Calefacción y ventilación
K1 Calefacción radiante
K1 Calor - Convección
AB This paper analyses the thermal behaviour of an underfloor air distribution system (UFAD) combined with a floor cooling, focusing on the thermal decay (TD). Two new models were implemented: a detailed model based on the convective heat transfer coefficient inside the plenum, and a simplified model based on the bypass factor. To validate the models we performed three experiments.Both, detailed and simplified models, reproduce well the measured TD. The maximum relative errors between the predicted and measured TD were 8.4% (transient state) and 1.3% (steady state). Although differences were higher at transient regimen, the terminal unit is designed to operate with smooth changes of the boundary conditions. As the error obtained by detailed and simplified models was near identical, the model based on the bypass factor is recommended because of its simplicity.A sensitivity analysis was performed. We evaluated: (1) the TD as a function of the supply air temperature and air flow rate, (2) the cooling capacity of the floor, and (3) the cooling capacity of the ventilation air. The paper concludes with a nomographic design chart that brings together all the features of the terminal unit, allowing a quick selection of the operating parameters.
PB Elsevier
YR 2018
FD 2018
LK https://hdl.handle.net/10630/32991
UL https://hdl.handle.net/10630/32991
LA eng
NO Antonio Atienza-Márquez, Francisco Fernández-Hernández, Fernando Domínguez-Muñoz, José Manuel Cejudo-López, Detailed and simplified models of a terminal unit that combines an UFAD system with a floor cooling, Applied Thermal Engineering, Volume 129, 2018, Pages 1079-1091, ISSN 1359-4311, https://doi.org/10.1016/j.applthermaleng.2017.10.093.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026