A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of air-conditioning systems on buoyancy driven air infiltration in large space buildings: A case study of a railway station
Abstract Large space buildings are widespread nowadays in the metropolis, in which the buoyancy driven air infiltration is extremely severe in heating/cooling seasons. This study pointed out that air-conditioning systems have a notable influence on air infiltration in large space buildings. A CFD model of a railway station was established and installed with typical air-conditioning systems, i.e., mixing ventilation (MV), displacement ventilation (DV), and radiant floor with displacement ventilation (RF+DV). Air infiltration rates of these cases were compared when the operative temperatures in the occupant zone were the same, respectively in the heating/cooling conditions. It is indicated that a uniform vertical temperature distribution in the heating condition and a significant thermal stratification in the cooling condition are potential to reduce air infiltration rate, which is best corresponded by RF+DV. Compared with the commonly-used stratified air-conditioning system with MV, RF+DV can reduce the air infiltration rate from 0.68 h−1 to 0.53 h−1 in the heating condition and save 38% of the heating capacity; it can reduce the air infiltration rate from 0.49 h−1 to 0.33 h−1 in the cooling condition and save 23% of the cooling capacity.
Influence of air-conditioning systems on buoyancy driven air infiltration in large space buildings: A case study of a railway station
Abstract Large space buildings are widespread nowadays in the metropolis, in which the buoyancy driven air infiltration is extremely severe in heating/cooling seasons. This study pointed out that air-conditioning systems have a notable influence on air infiltration in large space buildings. A CFD model of a railway station was established and installed with typical air-conditioning systems, i.e., mixing ventilation (MV), displacement ventilation (DV), and radiant floor with displacement ventilation (RF+DV). Air infiltration rates of these cases were compared when the operative temperatures in the occupant zone were the same, respectively in the heating/cooling conditions. It is indicated that a uniform vertical temperature distribution in the heating condition and a significant thermal stratification in the cooling condition are potential to reduce air infiltration rate, which is best corresponded by RF+DV. Compared with the commonly-used stratified air-conditioning system with MV, RF+DV can reduce the air infiltration rate from 0.68 h−1 to 0.53 h−1 in the heating condition and save 38% of the heating capacity; it can reduce the air infiltration rate from 0.49 h−1 to 0.33 h−1 in the cooling condition and save 23% of the cooling capacity.
Influence of air-conditioning systems on buoyancy driven air infiltration in large space buildings: A case study of a railway station
Liu, Xiaochen (author) / Liu, Xiaohua (author) / Zhang, Tao (author)
Energy and Buildings ; 210
2020-01-10
Article (Journal)
Electronic Resource
English