Abstract
In the ongoing age where the extent of fossil fuels is on a diminishing scale day by day, the storage of energy has become a fragile issue that needs to be addressed. The phase change materials (PCMs) are playing one such pivotal role in storing and reusing thermal energy with their unique property of storing and retrieving the heat while changing their phase. However, the addition of nanoparticles along with PCM enhances its thermal conductivity significantly. Hence, in the present study, latent heat storage (LHS) energy systems containing nano-enhanced PCM as well as PCM without nanomaterial are tested and compared for their heat storage capacities. The paraffin wax (OM-46) is taken as PCM and copper oxide (CuO) as nanomaterial with a size of 5–10 nm. The heat exchanger (HE) was designed with two concentric pipes having water as heat transfer fluid (HTF), flowing through the inner pipe. The annular space between two concentric pipes filled with PCM in one system and nano-enhanced phase change material (NEPCM) in the other. The computational fluid dynamics model is developed in ANSYS fluent to study the melting behavior of PCM and NEPCM. The performance of both systems was investigated for the charging and discharging cycle and compared.KeywordsPhase change materialLatent heat storageNano materialComputational fluid dynamicsCharging and discharging cycle
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