Performance of Phase Change Material Wall with Vertical Air Channels Integrating Solar Concentrators
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    Abstract:

    Due to the limit of heat transfer performance of building materials, the depth of the north wall affected by solar radiation was shallow in the passive solar greenhouse, which weakened the heat storage capacity of the wall interior. In this study, a phase change material wall with vertical air channels integrating solar concentrators was developed to fully strengthen the temperature and heat storage capacity of the wall interior by the active method and improve the temperature and heat storage capacity of PCM wallboards by the passive method. In order to prove the scientificity and feasibility of the identity, the experimental setup of multiple surfaces trough solar air collector and the experimental setup of phase change material wall with vertical air channels were built. And influencing characteristics of the air velocity in the collector and solar radiation on solar concentrators and influencing characteristics of the gap between air channels, the flow direction of heated air, and the velocity of the supply air on phase change material wall with vertical air channels were experimentally investigated, respectively. The results showed that the suitable air velocity in the collector was 1.4~1.8m/s, and the heat collection rose with the increase of solar radiation. The optimum conditions of phase change material wall were experimentally recommended: the gap was 400mm, the flow direction was downward, and the supply air velocity was 0.26m/s. While the experiment was carried out on the optimum conditions, the heat exchange effectiveness was 66.2%, and the active heat storage density was 9.43MJ/m3, 82.3% of which were stored in the block layer. Moreover, the discrepancy of the active heat storage and the heat release was 1.6%.

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History
  • Received:May 04,2014
  • Revised:
  • Adopted:
  • Online: March 10,2015
  • Published: March 10,2015