Abstract
Absorption thermal energy storage is promising for long-term storage of solar energy with both cooling and heating output purposes. Recently, the three-phase absorption thermal energy storage attracts significant attention due to its high energy storage density. However, its operation suffers from the vacuum operation and crystals blockage of piping systems, especially for the cooling output scenario. To resolve these issues, a three-phase absorption thermal energy storage in humid air for cooling is proposed, in which the dehumidification via three-phase absorption drives the evaporative cooling. Airflow is used for heat and mass transfer, which avoids vacuum operation and crystal blockage simultaneously. Comprehensive analysis considering the thermodynamic status of both working pair and humid air is carried out, with LiCl-H2O, LiBr-H2O, and CaCl2-H2O. Results showed that high ESD (energy storage density) of 563 kWh/m3 and COP (coefficient of performance) of 1.22 can be achieved under typical summer operating conditions, which are 3.2 and 2.1 times higher than that of the conventional cycle, respectively. Such simultaneous enhancement in ESD and COP has not been achieved by low-grade energy-driven sorption thermal storage yet, showing its great potential in real applications.
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