Computational Analysis of Transient Solidification Kinetics in Aluminum-Based Multicomponent Alloys for Graphical LHTES ModellingPages 40-51
Ivaldo L. Ferreira Abstract:
Latent heat thermal energy storage (LHTES) is applied to heating, ventilation and air-conditioning (HVAC) systems. Thus, it is essential to use renewable energy sources such as solar, wind, sea and geothermal to ensure the reliability and availability of generated power in the consumer grid. PCMs are employed extensively and available as paraffin waxes, non-paraffinic organics, hydrated salts, pure metals and alloys. The numerical simulation of thermal energy storage (TES) reservoirs depends on the thermophysical and phase transformation properties to predict the behaviour of latent heat release. The phase transformation process is numerically non-trivial since it adds non-linear behaviour to the set of transport equations. This work develops a numerical model for the transient solidification of multicomponent alloys for medium-temperature PCM to elaborate a graphical solution for melting/solidifying PCM as auxiliary tools in the design of thermal reservoirs. The theoretical solution proposed for the microsegregation parameter βi is based on the phase nucleation/growth radius, which is dependent on the thermal field tensor Γ in substitution of SDAS⁄2. The selection criterion of the alloys is based on the availability of thermophysical properties and phase diagrams. This is the first step in obtaining a data set for the AI designing-aid tool for LHTES reservoirs.
Keywords: Latent heat thermal energy storage, Medium-temperature PCM, Multicomponent PCM, Thermal reservoir, Graphical-aided TES design
|
PDF 