Thermal energy storage using absorption cycle and system: A comprehensive review.

• The absorption thermal energy storage cycles and systems are presented. • The integrated absorption thermal energy storage and systems are reviewed. • The working pairs for absorption thermal energy storage are discussed. • Perspectives for the development of absorption thermal energy storage are forwarded. Due to the high energy storage density and long-term storage capability, absorption thermal energy storage is attractive for the utilization of solar energy, waste heat, off-peak electricity, and etc. In recent years, absorption thermal energy storage has been intensively studied from thermodynamic cycles, working pairs, and system configurations for various purposes. In this paper, first, the absorption thermal energy storage cycles are discussed in detail. Then, storage integration with a conventional absorption chiller/heat pump, which can be driven by solar energy or compressor, is presented in a way of valorizing absorption systems. Next, working pairs including water-based working pairs, ammonia-based working pairs, alcohol-based working pairs, and others are reviewed. Finally, future perspectives are forwarded to realize the absorption thermal energy storage in practice, which encompasses developing of new absorption cycles and system configurations, new working pairs, and new reactor and heat exchanger design. [ABSTRACT FROM AUTHOR]