Paraffin energy storage technology

What are salt based and paraffin based PCMs?

Salt-based and paraffin-based PCMs are the common solid-liquid PCMs applied in thermal energy storage systems. Salt-based PCMs undergo the problems including subcooling, phase separation, and metal corrosion during melting.

Does nano graphite improve thermal energy storage performance of a paraffin-based phase change material?

Melting time was shortened by 21% with 0.06 wt% nano graphite with dispersant. Thermal energy storage performance of a paraffin-based phase change material (PCM) enhanced by nano graphite and nano coconut shell charcoal was investigated. The nano carbon concentration was 0.02, 0.06, and 0.10 wt%, respectively.

Are paraffin-based PCMs a promising PCM?

Therefore, paraffin-based PCMs are treated as promising PCMs because of their chemical stabilities, low subcooling, nontoxicity, et al . However, paraffin-based PCMs suffer from a lower thermal conductivity , resulting in a lower system efficiency.

What is the thermal conductivity of pure paraffin & nepcms in solid state?

The thermal conductivity of pure paraffin and NePCMs in solid state was tested via the hot-wire method with an accuracy of ±3%. Each test was conducted five times every three minutes at an indoor air temperature around 15 °C.

Why are thermal energy storage systems important?

Thermal energy storage systems play an important role for solar energy utilization, waste heat recovery, electrical device thermal management, and energy efficiency buildings .

Why did the temperature of a paraffin molecular chain vary?

The temperature varied because the mobility of paraffin molecular chains was restricted by the nano carbons . The latent heat for melting and solidification for pure paraffin was 188.0 J/g and 171.9 J/g, respectively. For NePCMs, the latent heat for melting and solidification was reduced by 19.7% and 13.7% using 0.10 wt% NG, respectively.