Heat flux in latent thermal energy storage systems: the influence of fins, thermal conductivity and driving temperature difference

Abstract Phase change materials (PCM) can increase the energy densities in thermal storage systems. Heat transfer rates PCMs are usually limiting, different improvement methods were used previously, such as fins or improved conductivities. Here, influence of fin geometries, PCM conductivity and discharge temperature secondary fluid investigated by modelling. The analysed outcomes their on stored energy, heat flux exergy. two-dimensional time dependent equation was solved for a rectangular enclosure with constant boundary condition one side. modelled data based paraffin melting at 44 °C. flux, but is lower than expected according to idealized calculations. basis this investigation evaluation dimensionless number formed from conductivity, difference phase characteristic length system. better found be higher volume fractions. had strongest impact exergy loss also increased. related achieved reduction an indicator flux. it seen that losses outweigh advantage difference.