Abstract
The effect of varying environment temperature on the efficiency of glycol cold thermal energy storage (CTES) is investigated. Several thermodynamic system parameters are analyzed, such as change in storage temperature, storage heat load, energy and exergy efficiencies and exergy destruction. Glycol CTES is treated as a potential application of sensible heat storage systems. A storage tank with a capacity of 150,000 kg is considered with an ethylene glycol- based water solution storage medium. Exergy analysis is used, which provides more useful information than energy analysis about energy quality, efficiency, losses and irreversibilities. Modelling results indicate that the system exergy efficiency is 46% less than energy efficiency. The system exergy efficiencies are 40% and 20% at 50°C and 10°C ambient temperatures, respectively. The results imply that cold energy is more efficient at higher ambient temperatures, storage heat loss depends weakly on ambient temperature, and the reference-environment temperature affects significantly exergy destruction and efficiency.
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