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Experimental study on thermophysical parameters of a solar assisted cascaded latent heat thermal energy storage (CLHTES) system

Author

Listed:
  • Fan, Man
  • Suo, Hanxiao
  • Yang, Hua
  • Zhang, Xuemei
  • Li, Xiaofei
  • Guo, Leihong
  • Kong, Xiangfei

Abstract

The low thermal conductivity of PCMs limited thermal storage/release properties of latent heat thermal energy storage (LHTES) systems, and the performance enhancement of PCMs thermal conductivity, PCMs stages and operating conditions needed to be investigated simultaneously. This study selected polyethylene glycol (PEG) as PCM and expanded graphite (EG) as matrix to prepare composite PCMs (CPCMs). When the mass ratio of PEG:EG was 9:1 and CPCM density was 954.8 kg/m3, the thermal performance was excellent without leakage. Compared to the single-stage LHTES tank, the heat storage/release time of four-stage cascaded LHTES (CLHTES) tank was 1040/320s longer, the heat storage/release rate was 0.92/1.04 times and the maximum exergy efficiency was 10.6% higher. For the four-stage CLHTES tank, its heat storage/release rate was fast and efficiency was high at the inlet temperature of 75/10 °C and flow rate of 3 L/min. When the four-stage CLHTES tank was used in a solar heating system, a wider range of phase change temperatures (31.4–55.2 °C) and a longer delay time of temperature peak (2290s) were obtained. Therefore, the CLHTES tank with high thermal conductivity CPCMs could play a significant role in improving the storage/release performance of renewable energy sources.

Suggested Citation

  • Fan, Man & Suo, Hanxiao & Yang, Hua & Zhang, Xuemei & Li, Xiaofei & Guo, Leihong & Kong, Xiangfei, 2022. "Experimental study on thermophysical parameters of a solar assisted cascaded latent heat thermal energy storage (CLHTES) system," Energy, Elsevier, vol. 256(C).
    • Handle: RePEc:eee:energy:v:256:y:2022:i:c:s0360544222015420
    DOI: 10.1016/j.energy.2022.124639
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