Thermal building control using active ventilated block integrating phase change material
Thermal building control using active ventilated block integrating phase change material
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DOI：
10.1016/j.enbuild.2019.01.024
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发表时间：
2019-03
影响因子：
6.7
通讯作者：
A. Laaouatni;N. Martaj;R. Bennacer;M. Lachi;M. Omari;M. Ganaoui
中科院分区：
文献类型：
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作者：
A. Laaouatni;N. Martaj;R. Bennacer;M. Lachi;M. Omari;M. Ganaoui
在提高建筑能效和热舒适性的背景下，相变材料(PCM)的使用是建议的解决方案之一。拟议的集成解决方案涉及建筑围护结构以及与其运营相关的应用程序。关于将相变材料融入建筑物墙壁的研究是许多作品的主题。然而，墙体储存/回收能量管理的非对称性较少受到控制，并不符合最优条件。在这项研究中，提出了一种基于稳定的相变材料(凝胶)在包括通风通道的封套中直接积分的解决方案，以克服这种反对称存储/恢复和适应不同固定环境条件的问题。在此背景下，对混凝土砌块系统进行了实验研究，通过循环招标的方法来测试这种结构的热响应。对这一完整的建设性解决方案的理解基本上是通过拥有经过验证的数值工具来实现的。为此，已经开发了两个模型。第一种模型采用基于RC等效的电热类比，其特点是相对简单，计算时间要求较低。这两个因素R和C中的每一个都总结了系统属性，并对一年内的建筑暂态模拟有直接影响。第二种是基于商业软件COMSOL多物理的能量和流体流动方程的直接数值模拟。这样的dns很耗时，不能用于一年以上的模拟，而是仅旨在验证第一种RC电路方法。将这两个模型与理想化的实验数据进行了比较，并验证了基于PCM与核心通风相结合的解决方案的热行为。
In the context of improving energy efficiency and thermal comfort in the building, the use of phase change materials (PCMs) is one of the suggested solutions. The proposed integration solutions concern the building envelope as well as the applications related to its operation. The study of the incorporation of PCM in the walls of the building was the subject of numerous works. However, the antisymmetric character of storing/recovering energy management in the walls is less controlled and do not fit the optimal conditions. In this study, a solution based on the direct integration of a stabilized PCM (gel) in an envelope including ventilation channels, was proposed to overcome this problem of antisymmetry storing/recovering and fitting with different fixed ambient conditions. The final aim is to develop the optimization strategy of a wall combining the heavy inertia offered by the PCM, intra-ventilation control and the contribution to air renewal energy demand.In this context, an experimental study of a concrete block system is conducted to test the thermal response of this configuration by the application of cyclic solicitations. The comprehension of this integrated constructive solution essentially passes by the possession of validated numerical tools. For this, two models have been developed. The first model using the electrical–thermal analogy, based on an RC equivalence, is distinguished by its relative simplicity and weak time computing demand. Each of these two factors, R and C summarise the system properties and has a direct influence on the building transient simulations over a year. The second one is based on direct numerical simulation DNS of the energy and fluid flow equations using commercial code COMSOL Multiphysics. Such DNS is time consuming and could not be used to simulate over a year but aims only to validate the first RC circuit approach. A comparison of these two models with the idealised experimental data was carried out and allowed the validation of the thermal behaviour of the solution based on the integration of the PCM with core ventilation.