Integrated heat pump with phase change materials for space heating

Ruxue Du, Minqiang Wu, Siqi Wang, Si Wu, Ruzhu Wang and Tingxian Li

Renewable and Sustainable Energy Reviews, 2024, vol. 203, issue C

Abstract: Thermal energy storage (TES) plays a key role in solving the energy mismatch between heat demand and supply. However, low energy efficiency and storage density are common challenges for various TES systems. Herein, an innovative energy-efficient TES system is proposed for space heating by integrating heat pump (HP) with phase change material (PCM). The condensation heat of HP is stored in the form of latent heat of PCM during the valley period of power demand, and the stored thermal energy is released for space heating during the peak period of power demand. Firstly, a cost-effective hydrated salt-based PCM with phase-change temperature of 50 °C is developed by analyzing the multi-level match relation of refrigerant-condensation temperature, phase-change temperature, and space heating temperature. Secondly, an integrated dual-functional finned-tube heat exchanger with special structures is designed as the condenser of HP and the TES device of PCM for lowering the temperature differences of heat transfer. Thirdly, a scalable and energy-efficient HP-PCM prototype is fabricated and its thermal charging/discharging performances at different conditions are investigated. Experimental results show the HP-PCM system has stable heat output and comfortable indoor temperature. Importantly, the proposed system exhibits high storage capacity (∼3.29 kWh), high energy storage density (∼64.5 kWh·m−3), and high heating power (∼2.60 kW). Furthermore, energy efficiency can be enhanced by 151.6 % compared to traditional TES device and operational cost can be decreased to 15.1 % of conventional electric heating system. The proposed energy-efficient HP-PCM system exhibits great potential for scalable and cost-effective space heating with energy storage.

Keywords: Thermal energy storage; Heat pump; Phase change material; Energy efficiency; Space heating (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.rser.2024.114769

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