Numerical Simulation of Enhanced Heat Transfer in Cased Solar Phase Change Accumulators
The solar phase change heat storage technology is concerned because it can save resources and protect environment,and meet the requirement of energy development in our country.Its intermittent and unstable characteristics increase the difficulty of its utilization.The role of phase change materials(PCM)in solar phase change heat storage is explored by simulating the cased phase change heat storage through finite element numerical analysis method.The results show that the addition of expanded graphite can substantially improve the heat storage and discharge efficiency of solar thermal accumulators.Compared with the conventional paraffin heat storage,the heat storage time of paraffin with 20%mass fraction of expanded graphite is shortened by 91.11%under the same initial conditions of inlet velocity and ambient temperature,which has the effect of enhancing heat transfer.This study provides an important reference for the development of solar water heaters,high-efficiency heat exchangers and thermal energy storage in buildings and other fields.
phase change heat storagefinite element numerical analysisexpanded graphiteenhanced heat transfer
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