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Performance investigation on an air source heat pump system with latent heat thermal energy storage

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  • Lin, Ying
  • Fan, Yubin
  • Yu, Meng
  • Jiang, Long
  • Zhang, Xuejun

Abstract

This paper proposes an air source heat pump (ASHP) system integrated with a latent heat thermal energy storage (LTES) unit based on a specially-designed heat exchanger, condensing heat storage unit, to further improve system performance in cold region. The innovation of this device is that heat is transferred directly between refrigerant and phase change material (PCM), which significantly reduces heat loss. Experimental investigation on thermal performance of the system is carried out. Besides, a mathematical model of condensing heat storage unit is developed to investigate charging/discharging characteristics and validated by experimental data. Experimental results show that heat storage capacity reaches 31.83 kWh and average heat release power is 4.73 kW. Simulation results indicate that both smaller fin pitch and larger fin thickness accelerate the melting rate of PCM, but variations of tube diameter show little impact on it. In order to maintain heat release power, circulating water flow rate should be increased with discharging time. Three-stage PCM improves both energy and exergy performance compared to single-stage PCM. COP improvement could reach 4.01% and overall exergy efficiency is increased by 4.65%. Therefore, ASHP system combined with LTES unit is a potential approach to expand its application under extremely low temperature.

Suggested Citation

  • Lin, Ying & Fan, Yubin & Yu, Meng & Jiang, Long & Zhang, Xuejun, 2022. "Performance investigation on an air source heat pump system with latent heat thermal energy storage," Energy, Elsevier, vol. 239(PA).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pa:s0360544221021460
    DOI: 10.1016/j.energy.2021.121898
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    2. Beyne, W. & T'Jollyn, I. & Lecompte, S. & Cabeza, L.F. & De Paepe, M., 2023. "Standardised methods for the determination of key performance indicators for thermal energy storage heat exchangers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 176(C).
    3. Wenhe Zhou & Bin Wang & Meng Wang & Yuying Chen, 2022. "Performance Analysis of the Coupled Heating System of the Air-Source Heat Pump, the Energy Accumulator and the Water-Source Heat Pump," Energies, MDPI, vol. 15(19), pages 1-11, October.
    4. Rong, Xiangyang & Long, Weiguo & Jia, Jikang & Liu, Lianhua & Si, Pengfei & Shi, Lijun & Yan, Jinyue & Liu, Boran & Zhao, Mishen, 2023. "Experimental study on a multi-evaporator mutual defrosting system for air source heat pumps," Applied Energy, Elsevier, vol. 332(C).
    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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