Energy Storage Science and Technology ›› 2017, Vol. 6 ›› Issue (6): 1306-.doi: 10.12028/j.issn.2095-4239.2017.0118

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Preparation and characterization of gypsum composites containing cupric- palmitic acid based phase change material in diatomite

SHI Wenhua1, ZHU Xingyuan1, ZHU Jiaoqun1, LIU Fengli1,2, LI Ruguang1, ZHANG Hongguang1   

  1. 1School of Materials and Science Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China;
    2Institute of Material and Structure, Henan University, Kaifeng 475004, Henan, China
  • Received:2017-06-30 Revised:2017-07-28 Online:2017-11-01 Published:2017-11-01

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Abstract:

Cupric acid (CA)-palmitic acid (PA) based phase change material (PCM) was adsorbed by porous diatomite to form shape-stabilized PCM. The shape stable PCM was then mixed with gypsum to form gypsum composite. A differential scanning calorimetry (DSC) was used to measure the phase change temperature and the enthalpy of the composite PCM and the gypsum composite containing PCM in diatomite. The thermal storage material was further tested for the stability, strength, and water absorption behavior. The results showed that the phase change temperature and the enthalpy of the shape-stable are respectively 26.44 ℃and 83.71 J·g1. An increase in the addition of the PCM in the gypsum increases the phase change enthalpy, whereas the strength and the rate of water absorption decrease. It is found that the gypsum composite with 25% of shape-stable phase change materials being the best with a phase change temperature of 22.76 ℃, a phase change enthalpy of 8.42 J·g1, a 7-day oven dry compressive strength of 5.93 MPa, a 7-day full water compressive strength of 4.59 MPa, and a bibulous rate of 15.0%.

Key words: fatty acids, diatomite, shape-stabilized phase change materials (SS-PCMs), thermal- storage gypsum composites