TY - JOUR
T1 - A new structure of PCHE with embedded PCM for attenuating temperature fluctuations and its performance analysis
AU - Zhang, Lianjie
AU - Yang, Ping
AU - Li, Wei
AU - Klemeš, Jiří Jaromír
AU - Zeng, Min
AU - Wang, Qiuwang
N1 - Publisher Copyright:
© 2022
PY - 2022/9/1
Y1 - 2022/9/1
N2 - The heat exchanger is an essential component of the supercritical CO2 Brayton cycle. To attenuate the temperature fluctuations in the cycle, this study proposes a new structure with phase change materials embedded in the printed circuit heat exchanger. This structure package can contain a variety of phase change materials in a stepwise arrangement and a composite phase change material with expanded graphene. The effects of different flow directions, the number of layers in the phase change material ladder, whether the phase change material is compounded with expanded graphene or not, and the thickness of the phase change material were numerically compared. The results show that the PCM layer with 0.45 mm thickness has a smaller amplitude of both temperature fluctuations and liquid fraction fluctuations than that of 0.25 mm. Relative to the case without PCM, the outlet of hot side’ temperature fluctuation amplitude of PCM/EG-3 and PCM/EG-5 with 0.45 mm thickness decreased by 17.11% and 22.37%, and the outlet of cold side’ temperature fluctuation amplitude decreased by 36.84% and 38.16%, while the heat exchange decreased by only 2.28% and 1.78%, respectively.
AB - The heat exchanger is an essential component of the supercritical CO2 Brayton cycle. To attenuate the temperature fluctuations in the cycle, this study proposes a new structure with phase change materials embedded in the printed circuit heat exchanger. This structure package can contain a variety of phase change materials in a stepwise arrangement and a composite phase change material with expanded graphene. The effects of different flow directions, the number of layers in the phase change material ladder, whether the phase change material is compounded with expanded graphene or not, and the thickness of the phase change material were numerically compared. The results show that the PCM layer with 0.45 mm thickness has a smaller amplitude of both temperature fluctuations and liquid fraction fluctuations than that of 0.25 mm. Relative to the case without PCM, the outlet of hot side’ temperature fluctuation amplitude of PCM/EG-3 and PCM/EG-5 with 0.45 mm thickness decreased by 17.11% and 22.37%, and the outlet of cold side’ temperature fluctuation amplitude decreased by 36.84% and 38.16%, while the heat exchange decreased by only 2.28% and 1.78%, respectively.
KW - Expanded graphene composite structures
KW - Ladder arrangement
KW - Phase change material
KW - Printed circuit heat exchanger
KW - Temperature fluctuation amplitude
UR - https://www.scopus.com/pages/publications/85131967889
U2 - 10.1016/j.energy.2022.124462
DO - 10.1016/j.energy.2022.124462
M3 - 文章
AN - SCOPUS:85131967889
SN - 0360-5442
VL - 254
JO - Energy
JF - Energy
M1 - 124462
ER -
