梯级蓄热对相变地板供热性能影响

Effect of cascade heat storage on heating performance of phase change floor

中文关键词: 相变材料  相变地板  储热  梯级蓄热  数值模拟

英文关键词: phase change materials  phase change floor  heat storage  cascade heat storage  numerical simulation

中文摘要:

      改善相变地板供热性能有助于进一步推动储能技术与建筑供热技术的结合与发展。为厘清不同梯级蓄热方式对相变地板供热性能影响规律。研究采用ANSYS Fluent仿真模拟软件，在通过实验验证了模拟结果准确性后，对不同相变材料（PCMs）布置位置、全热源和局部热源加热方式下的相变木/大理石地板蓄放热过程进行了模拟分析。结果表明，在全热源加热方式下，梯级蓄热能够延长放热时间，并促进PCMs的熔化，但房间和地板表面温度也会随低温PCMs用量的增加而降低。在局部热源加热方式下，低温PCMs布置在相变木地板的非加热区域处可以缩短蓄热时间并延长放热时间。而在大理石地板加热区域处布置低温PCMs则可在保持房间和地板较高温度的同时有效增加蓄热量。相比于相变木地板，相变大理石地板受梯级蓄热方式的影响更为明显，蓄热量最多可增加约23%。

英文摘要:

      Improving the performance of phase change floor heating is helpful to further promote the combination and development of energy storage technology and building heating technology. In order to clarify the effect of different cascade heat storage methods on the heating performance of phase change floor. ANSYS Fluent simulation software was used to simulate and analyze the heat storage and release process of phase change wood/marble floor under different phase change materials (PCMs) arrangement positions, full and local heat source heating methods, after verifying the accuracy of the simulation results through experiments. The results show that under the full heating method, the cascade heat storage can prolong the heat release time and promote the melting of PCMs, but the temperature of the room and the floor surface will also decrease with the increase of the amount of low-temperature PCMs. In the local heating method, the low-temperature PCMs arranged at the non-heating zone of the phase change wood floor can shorten the heat storage time and prolong the heat release time. The arrangement of low-temperature PCMs at the heating zone of marble floor can effectively increase the heat storage capacity while maintaining the high temperature of the room and floor surface. Compared with the phase change wood floor, the phase change marble floor is more obviously affected by the cascade heat storage method, and the heat storage capacity can be increased by about 23 % at most.