Reducing the Cooling Energy Demand by Optimizing the Airflow Distribution in a Ventilated Roof: Numerical Study for an Existing Residential Building and Applicability Map

被引:1
|
作者
Rincon-Casado, Alejandro [1 ]
Jara, Enrique Angel Rodriguez [2 ]
Pardo, Alvaro Ruiz [2 ]
Lissen, Jose Manuel Salmeron [3 ]
de la Flor, Francisco Jose Sanchez [2 ]
机构
[1] Univ Cadiz, Coll Engn, Dept Mech & Ind Design, Cadiz 11510, Spain
[2] Univ Cadiz, Coll Engn, Dept Machines & Thermal Motors, Cadiz 11510, Spain
[3] Univ Seville, Grp Termotecnol, Dapt Engn Energy, Seville 41092, Spain
来源
APPLIED SCIENCES-BASEL | 2024年 / 14卷 / 15期
关键词
ventilated hollow core slab systems; building retrofitting; thermal efficiency; thermo-hydraulic performance factor; ventilated roof; THERMOHYDRAULIC PERFORMANCE; HEAT-TRANSFER; MASS; SURFACES; SYSTEM; MODEL;
D O I
10.3390/app14156596
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
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页数:18
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