The increasing desire for comfort and healthy indoor environment, as well as improvements in energy standards in recent years, have stressed the need to make an active use of the building mass to achieve the maximum energy saving This is why the application of ventilated hollow-core slab systems (VHCS) can be considered as one of the innovative approaches. These systems have precast concrete slabs with tubular voids directing ventilation air on its length. In the present study Solving this system numerically using the ANSYS fluent program to study the temperature distribution and air flow in the 3-D test model of the present study to determine the feasibility of applying this system in an arid climate especially in Iraq by checking the inlet velocity and temperature and to predict the impact of these operating parameters on human comfort and energy savings. The study aimed to provide a numerical analysis of a conditioned zone's temperature distribution using VHCS. The investigation was carried out on a scale model room of size (1 m × 1.2 m × 1 m) with a scale factor of ¼. Four distinct scenarios were examined: the first two cases occurred during a no-load time in the night when there were no internal or external loads and examined the effects of changes in inlet temperatures and air velocities. The remaining two scenarios were conducted during an occupied period with internal heat gain of 630 W/m and external heat gain of 800 W/m based on the SHGC for the summer season of Iraq. As previously demonstrated, setting the inlet velocity to 1 m/s resulted in an optimal temperature and velocity distribution in the main flow, irrespective of changes in the external and internal loads and temperatures of the supply core. The findings shown that input air velocity and temperature affect heat remove efficiency. In addition, numerical outcomes have also illustrated that the Thermal Active VHCS System, while used in combination with ventilation strategies, could indeed regulate the space conditions by cooling down the building's ceiling, thus eradicating stored heat. All investigations found VHCS systems suitable for air conditioning in dry and hot locations. The systems are known for their ease of use, simplicity, high performance, comfort, and energy savings. They can also reduce peak loads to boost structural energy efficiency.

中文翻译：

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通过通风空心板系统提高建筑能源效率


人们对舒适、健康的室内环境的追求日益提高，以及近年来能源标准的提高，都强调需要积极利用建筑体量来实现最大程度的节能，这就是为什么通风空心墙的应用平板系统（VHCS）可以被视为创新方法之一。这些系统具有预制混凝土板，其具有管状空隙，可在其长度上引导通风空气。在本研究中，使用 ANSYS Fluent 程序对该系统进行数值求解，以研究本研究 3D 测试模型中的温度分布和气流，通过检查入口速度和温度，并预测这些运行参数对人体舒适度和节能的影响。该研究旨在使用 VHCS 对调节区域的温度分布进行数值分析。调查在尺寸为（1 m × 1.2 m × 1 m）、比例因子为 1/4 的比例模型室中进行。研究了四种不同的情况：前两种情况发生在夜间无负载期间，没有内部或外部负载，并检查了入口温度和空气速度变化的影响。其余两种情景是在有人居住期间进行的，根据伊拉克夏季的 SHGC，内部得热为 630 W/m，外部得热为 800 W/m。如前所述，将入口速度设置为 1 m/s 可以在主流中实现最佳温度和速度分布，而不管供应核心的外部和内部负载以及温度如何变化。 研究结果表明，输入空气速度和温度会影响散热效率。此外，数值结果还表明，热主动 VHCS 系统在与通风策略结合使用时，确实可以通过冷却建筑物的天花板来调节空间条件，从而消除储存的热量。所有调查均发现 VHCS 系统适用于干燥和炎热地区的空调。该系统以其易用性、简单性、高性能、舒适性和节能性而闻名。它们还可以减少峰值负荷，以提高结构能源效率。