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 °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 °C in PCM room in the daytime, and the space air temperature at night is also increased by about 0.3 °C if ventilation system works at night.

近零能耗建筑（NZEB）以低能耗和更好的隔热性而著称，因此有望探索其蓄热潜力和灵活的蓄热特性。在这项研究中，一种新型地板与蓄热增强材料 - 微封装相变材料 (PCM) 和通风回路相结合，构建在经过验证的 NZEB 中。具有相同通风系统但由普通混凝土制成的对比地板也建在另一个具有相同围护结构的房间中。通过一系列实验研究了太阳辐射、PCM 和通风对蓄热和空间供暖性能的影响。结果表明，采用PCM的地板，蓄热能力提高了约77.36 %，空间的热稳定性也得到提高。与不通风的情况相比，通风可使最高和最低气温升高 0.5 °C 以上。此外，在目前的实验条件下，通风还可以显着提高空间加热和冷却率，分别超过16.7 %和12.6 %，这对于加热系统的灵活运行具有重要意义。最后发现白天太阳辐射可使PCM房间的空间空气温度升高3.0°C以上，如果通风系统正常工作，夜间空间空气温度也会升高0.3°C左右。夜晚。