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建立槽式太阳能集热与相变蓄热耦合模型,开发数值模拟程序。研究一日中太阳辐射强度非稳态变化引起的集热器出口工质温度波动对相变蓄热单元蓄热性能的影响规律;并进一步对比分析单一相变材料和2级组合相变材料对蓄热性能的影响。结果表明,蓄热速率随时间呈现先减小、再增大、然后再次降低的变化规律,总蓄热量存在一个最大值。单一相变材料在14∶18时完全熔化,总蓄热量在16∶00时达到最大值;组合相变材料在13∶45时完全熔化,总蓄热量在15∶14时达到最大值。采用组合相变材料可以提高蓄热速率。
The coupling model between trough solar collector and phase change thermal storage was established and numerical simulation program was developed. The influence of temperature fluctuation of collector outlet temperature on the thermal storage performance of phase change thermal storage unit caused by the unsteady change of solar radiation intensity during the first day was studied. The effects of single phase change material and phase 2 composite phase change material on thermal storage The impact of performance. The results show that the heat storage rate decreases first, then increases, and then decreases again, the total heat storage has a maximum value. The single phase change material completely melted at 14:18, the total heat storage reached the maximum at 16:00; the composite phase change material completely melted at 13:45, and the total heat storage reached the maximum at 15:14. Using a combination of phase change materials can increase the heat storage rate.