Title: Investigation of the thermal performance of cascaded latent heat thermal energy storage system based on composite phase change materials

Authors: Qunli Zhang; Yimo Liu; Zhaosheng Yang; Gang Wang; Xiaoshu Lü

Addresses: Beijing Municipality Key Lab of Heating, Gas Supply, Ventilation and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing 100044, China; Collaborative Innovation Center of Energy Conservation and Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing 100044, China ' Beijing Municipality Key Lab of Heating, Gas Supply, Ventilation and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing 100044, China; Collaborative Innovation Center of Energy Conservation and Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing 100044, China ' Beijing Municipality Key Lab of Heating, Gas Supply, Ventilation and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing 100044, China; Collaborative Innovation Center of Energy Conservation and Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing 100044, China ' Beijing Municipality Key Lab of Heating, Gas Supply, Ventilation and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing 100044, China; Collaborative Innovation Center of Energy Conservation and Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Xicheng District, Beijing 100044, China ' Department of Electrical Engineering and Energy Technology, University of Vaasa, P.O. Box 700, FIN-65101, Vaasa, Finland; Department of Civil Engineering, Aalto University, P.O. Box 12100, FIN-02130, Espoo, Finland

Abstract: This paper conducts thermodynamic analysis of the cascaded latent heat thermal energy storage system that is applicable to building heat storage, with focus on using the high performance composite phase change materials (CPCM). The 7.5wt. %EG/MgSO₄7H₂O-KAl(SO₄)₂12H₂O were used as PCM, the performance of cascaded system and single-stage system were compared. The results show that exergy efficiency, heat charging rate and discharging rate of the cascaded system compared with the single-stage system can be increased at most by 11.6%, 49.7%, and 9.7%, respectively. This work has important guiding significance for the applied research of the heat storage system with the CPCM.

Keywords: phase change material; exergy efficiency; thermal storage; numerical simulation.

DOI: 10.1504/IJEX.2023.131487

International Journal of Exergy, 2023 Vol.41 No.2, pp.197 - 218

Received: 21 Nov 2022
Received in revised form: 20 Feb 2023
Accepted: 20 Feb 2023
Published online: 14 Jun 2023 *

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