RT journal article
T1 Reducing the Cooling Energy Demand by Optimizing the Airflow Distribution in a Ventilated Roof: Numerical Study for an Existing Residential Building and Applicability Map
A1 Rincón Casado, Alejandro
A1 Rodríguez Jara, Enrique Ángel
A1 Ruiz Pardo, Álvaro
A1 Salmerón Lissén, José Manuel
A1 Sánchez de la Flor, Francisco José
A2 Ingeniería Mecánica y Diseño Industrial
A2 Máquinas y Motores Térmicos
K1 ventilated hollow core slab systems
K1 building retrofitting;
K1 thermal efficiency
K1 thermo-hydraulic performance factor
K1 ventilated roof
AB This work presents a study of a ventilated hollow core slab system (VHCS) that obviates the need to completely replace the slab of an existing residential building. It is assimilated to a heat exchanger to allow its effectiveness to be studied as a function of the area and airflow rate. The balance between the energy consumed by the fan and the heat evacuated by the system is also studied through the use of the thermo-hydraulic performance factor (THPF), for which a series of cases were simulated by CFD following a methodology in which a configuration is achieved by means of the sequential analysis of cases in which both the thermal effectiveness and the THPF are maximized. The configuration chosen in this study was found to benefit from high airflow rates since, although this implies an increase in fan energy consumption, the increase in heat removed is proportionally greater. It has also been found that the design of the airflow distribution through the slab is of high importance as it affects both the heat exchanged with the slab and the pressure losses. An applicability map has been developed as a function of the temperature of the space below and the air temperature at the inlet of the ventilated roof. The heat flux per unit area that the studied envelope is able to evacuate is about 20 W/m2 K.
PB MDPI
SN 2076-3417
YR 2024
FD 2024
LK http://hdl.handle.net/10498/34751
UL http://hdl.handle.net/10498/34751
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026