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Abstract Most phase change materials employed in latent heat thermal energy storage suffer from poor thermal conductivity both in liquid and solid phases, leading to low heat transfer effectiveness. To overcome this limitation, multiple PCMs and gradient copper foam have been used to accelerate the melting of phase change materials and improve the heat transfer effectiveness. The heat transfer performance of shell-and-tube thermal energy storage unit consisting of radial multiple PCMs and single PCM was numerically investigated. The utilization of single PCM showed better heat transfer effect...

Abstract The selection of artificial cylinder boundary is of vital importance in the simulation of multiple-tube thermal energy storage (TES). This paper is intended to design and compare the accuracy of the concentric and eccentric artificial cylinder boundary, which is used to simplify the geometry of multiple tubes thermal energy storage system in the numerical computation. The eccentric artificial cylinder boundary shows the higher accuracy due to fully considering the development of buoyancy-driven convection. Based on the single tube TES with eccentric artificial cylinder boundary, the ...