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Preparation and characterizations of a novel temperature-tuned phase change material based on sodium acetate trihydrate for improved performance of heat pump systems

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  • Li, Minqi
  • Lin, Zhongqi
  • Sun, Yongjun
  • Wu, Fengping
  • Xu, Tao
  • Wu, Huijun
  • Zhou, Xiaoqing
  • Wang, Dengjia
  • Liu, Yanfeng

Abstract

Application of latent heat thermal energy storage unit is regarded as an effective method to improve the coefficient of performance of hot water heat pump systems (HWHPS). With consideration of energy efficiency and domestic hot water usage, phase change materials with a melting temperature range of 45–48 °C are suitable for practical applications. The most commonly used PCMs, paraffin-based materials, are costly and have low latent heat density, which restrains their applications. This study therefore aims to prepare a novel sodium acetate trihydrate based composite PCM with suitable phase change temperature and cost-effectiveness for HWHPs. A series of SAT-based composites with varying mass fraction of potassium chloride (KCl), urea, disodium phosphate dodecahydrate (DSP) and carboxyl methyl cellulose (CMC) were prepared. Their thermophysical properties and stability were investigated by freezing-melting cycling tests, differential scanning calorimetry (DSC) and X-ray powder diffraction (XRD). The experimental results indicated that the optimized SAT-based CPCM with 8 wt% KCl, 3 wt% urea, 6 wt% CMC and 1.5 wt% DSP displayed a favorable phase change temperature of 47.8 °C and a higher latent heat of 242.0 kJ/kg. Meanwhile, the results demonstrated that it has extraordinary thermal cycling performance, negligible vibration in phase change temperature and latent heat, and good stability in chemical properties.

Suggested Citation

  • Li, Minqi & Lin, Zhongqi & Sun, Yongjun & Wu, Fengping & Xu, Tao & Wu, Huijun & Zhou, Xiaoqing & Wang, Dengjia & Liu, Yanfeng, 2020. "Preparation and characterizations of a novel temperature-tuned phase change material based on sodium acetate trihydrate for improved performance of heat pump systems," Renewable Energy, Elsevier, vol. 157(C), pages 670-677.
    • Handle: RePEc:eee:renene:v:157:y:2020:i:c:p:670-677
    DOI: 10.1016/j.renene.2020.05.061
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    2. Du, Yu & Huang, Haowei & Hu, Xinpeng & Liu, Shuang & Sheng, Xinxin & Li, Xiaolong & Lu, Xiang & Qu, Jinping, 2021. "Melamine foam/polyethylene glycol composite phase change material synergistically modified by polydopamine/MXene with enhanced solar-to-thermal conversion," Renewable Energy, Elsevier, vol. 171(C), pages 1-10.
    3. Jin, Xin & Zhang, Huihui & Huang, Gongsheng & Lai, Alvin CK., 2021. "Experimental investigation on the dynamic thermal performance of the parallel solar-assisted air-source heat pump latent heat thermal energy storage system," Renewable Energy, Elsevier, vol. 180(C), pages 637-657.
    4. Yang, Haibin & Bao, Xiaohua & Cui, Hongzhi & Lo, Tommy Y. & Chen, Xiangsheng, 2022. "Optimization of supercooling, thermal conductivity, photothermal conversion, and phase change temperature of sodium acetate trihydrate for thermal energy storage applications," Energy, Elsevier, vol. 254(PA).
    5. Cong Zhou & Yizhen Li & Fenghao Wang & Zeyuan Wang & Qing Xia & Yuping Zhang & Jun Liu & Boyang Liu & Wanlong Cai, 2023. "A Review of the Performance Improvement Methods of Phase Change Materials: Application for the Heat Pump Heating System," Energies, MDPI, vol. 16(6), pages 1-21, March.

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