Volume 53

A novel absorption thermal storage system dynamic model for thermal energy storage Zhenpeng Deng, Shuo Wang, Hua Chen, Wen-long Cheng

Abstract

Thermal energy storage plays an important role in renewable energy utilization. Absorption thermal storage (ATS) is used to balance heat source and load due to its high stability. To investigate the charging and discharging process of ATS, a novel dynamic ATS model was proposed and validated. Based on the established model, the effects of charging temperature, discharging temperature, condenser inlet temperature, and evaporator inlet temperature on the performance of thermal storage were analyzed. The results show that the higher charging temperature increases solution glide, resulting in improved energy storage efficiency and energy storage density. The maximum energy storage efficiency is between 0.25 and 0.65, while the maximum energy storage density varies from 55.6 kWh/m³ to 143.6 kWh/m³, with discharging temperatures of 70 – 90 °C. Increasing the condenser inlet temperature and decreasing the evaporator inlet temperature significantly reduces the charging time and discharging time, respectively.

Keywords absorption thermal storage, energy storage efficiency, energy storage density