On-site measurement of the thermal performance of a novel ventilated thermal storage heating floor in a nearly zero energy building
On-site measurement of the thermal performance of a novel ventilated thermal storage heating floor in a nearly zero energy building
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DOI：
10.1016/j.buildenv.2021.107993
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发表时间：
2021-05-29
影响因子：
7.4
通讯作者：
Tao, Jin
中科院分区：
文献类型：
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作者：
Guo, Jiwei;Dong, Jiankai;Tao, Jin
近零能耗建筑（NZEB）以其能源需求低、保温效果好而著称，因此其蓄热潜力和灵活蓄热特性的挖掘具有广阔的前景。在本研究中，在演示的NZEB中构建了一种集成了储热增强材料-微封装相变材料（PCM）和通风回路的新型地板。与之形成对比的地板采用了相同的通风系统，但由普通混凝土制成，也建在另一个具有相同围护结构的房间内。通过一系列实验研究了太阳辐射、PCM和通风对储热和空间采暖性能的影响。结果表明：加PCM地板的储热能力提高了约77.36%，空间热稳定性也得到了改善。与不通风的情况相比，通风可使最高气温和最低气温提高0.5℃以上。此外，在目前的实验条件下，通风还可以显著提高空间的制热和制冷速率，分别超过16.7%和12.6%，这对供暖系统的灵活运行具有重要意义。最后发现，太阳辐射可使PCM室内白天的空间空气温度升高3.0℃以上，如果夜间通风系统工作，夜间的空间空气温度也升高0.3℃左右。
The nearly zero energy building (NZEB) is known for the low energy demand and better thermal insulation, thus it is promising to explore the thermal storage potential, and the flexible thermal storage characteristics. In this research, a novel floor integrated with thermal storage enhancement material - micro encapsulated phase change material (PCM), and the ventilation loops, is built in a demonstrated NZEB. A contrast floor with the same ventilation system, but is made of common concrete, is also built in another room with the same envelope. The impacts of solar radiation, PCM and ventilation on thermal storage and space heating performance are investigated by conducting a series of experiments. The results show that for the floor with PCM, the thermal storage capacity is increased by about 77.36%, and the thermal stability of space is also improved. Ventilation can increase both the peak and minimum air temperature by more than 0.5 degrees C as compared to the case without ventilation. Besides, under the current experimental conditions, ventilation can also significantly increase the space heating and cooling rates by more than 16.7% and 12.6%, respectively, which is meaningful for the flexible operation of the heating systems. In the last, it is found out that solar radiation can increase the space air temperature by more than 3.0 degrees C in PCM room in the daytime, and the space air temperature at night is also increased by about 0.3 degrees C if ventilation system works at night.