Thermodynamic analysis of an advanced high-temperature heat pump energy storage unit based on phase-change heat storage
Carnot batteries use thermodynamic cycles to convert and store electrical energy as thermal energy,which can be effectively integrated with industrial waste heat to facilitate a coordinated supply of cooling,heat,and electricity.This approach enhances the integration of renewable energy sources.This study investigates the thermodynamic properties of Carnot batteries,coupled with shell-and-tube thermal energy storage systems based on phase-change heat storage.We thoroughly analyzed the thermodynamic properties of the battery,considering factors such as temperature variations between the heat transfer fluid and the energy storage medium,the cumulative heat storage and release process,and the overall heat capacity.In addition,we performed a dimensionless analysis of the established two-dimensional transient model to improve the generalizability of the results.Results indicate that after the charging cycle,the outlet temperature can reach 0.83.The maximum and average power of the device were calculated as 1860 W and 624.7 W,respectively.Based on the second law of thermodynamics,it can be inferred that the stored exergy decreases sequentially along the flow direction,primarily due to the significant amount of exergy stored in the inlet PCM,with the amount of exergy released by the storage unit approaching 0 at the discharge time,t*=0.93.
energy storagephase change heat storagenumerical simulationthermodynamic analysis
万方数据
维普
