A semi-analytical model for evaluating the thermal storage capacity and heat use efficiency of flexible thermal storage heating floor
A semi-analytical model for evaluating the thermal storage capacity and heat use efficiency of flexible thermal storage heating floor
复制标题
评估柔性蓄热采暖地板蓄热能力和热利用效率的半解析模型
DOI：
10.1016/j.applthermaleng.2021.117448
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发表时间：
2021-11
影响因子：
6.4
通讯作者：
Jiang Yiqiang
中科院分区：
文献类型：
--
作者：
Guo Jiwei;Jiang Yiqiang
利用建筑物的热质量作为热电池，有望提高能源效率和可再生能源的渗透率。然而，地板的蓄热能力和能量利用效率，特别是对于那些热激活的地板，仍然不清楚。本研究量化了几种新型通风供暖地板，包括混凝土地板和相变材料（PCM）地板，可以有效地存储和使用的热量。为了提供一个方便可靠的仿真工具，可用于设计和运行阶段，建立了基于简化状态空间模型和基本热传导方程的通风地板半解析模型，并通过实验进行了验证。基于响应面法分析了壁厚、管径和风速3个参数对蓄热能力和热利用效率的影响，建立了5种不同通风方式下蓄热能力和热利用效率的预测模型。结果表明，与普通混凝土砌块相比，相变材料在各种通风方式下均能提高热利用效率。响应面法计算结果表明，当地板厚度为15 cm，风管直径为2cm时，通风相变地板的最大蓄热能力为1113.9kJ/m2。厚度是提高热利用效率的唯一因素，内通风方式更有利于提高热利用效率。
Using the thermal mass of building as the thermal battery is promising to increase energy efficiency and the penetration of renewable energy. However, the thermal storage capacity and energy use efficiency of floor, especially for those that are thermally activated, are still not clear. This study quantifies the amount of heat that can be effectively stored and used of several novel ventilated heating floors, including a concrete floor and a floor with phase change material (PCM). To provide a convenient and reliable simulation tool that can be used in both design and operation stages, a semi-analytical model of the ventilated floor based on the previously built simplified state-space model and the fundamental heat conduction equations was established and validated by experiment. The impact of three parameters on the heat storage capacity and heat use efficiency, including the thickness, the tube diameter, and the velocity was analyzed based on the response surface methodology (RSM), and five models to predict the capacity and efficiencies in different ventilation modes were built. The results show that PCM can increase the heat use efficiency in all ventilation modes compared to common concrete block. RSM results demonstrated that the maximum thermal storage capacity of the ventilated PCM floor is 1113.9 kJ/m 2 when the thickness is 15 cm and the diameter of the air duct is 2 cm. Besides, thickness is the only factor to increase the heat use efficiency, and inner ventilation mode is more conducive to improving the efficiency.
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DOI：
10.1016/s0017-9310(98)00121-5
发表时间：
1999-01
影响因子：
5.2
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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