基于煅耗散最小的超临界二氧化碳传热优化研究

Heat Transfer optimization of CO_2 at Supercritical Pressures Based on the Least Entransy Dissipation Analyses

换热器性能的优化,不但能够强化传热减小阻力,而且能够节约能源和减少环境污染,这在能源日益短缺的今天具有重要的经济价值和社会效益。本文通过编程迭代的方法,对文献中的(火积)耗散均匀分布原则(EoED)和温差均匀分布原则(EoTD)略做改进,使改进后的两种优化原则更好地与实际应用相结合。基于改进后的两种优化原则,分析比较了二氧化碳在不同进口质量流量下,两种原则优化的效果.结果表明,从有效度、煅耗散数等沿管长Z方向的大小变化,显示(火积)耗散均匀分布原则优化结果明显优于温差均匀分布原则,表明煅耗散均匀分布原则的传热效率高于温差均匀分布原则.

The optimization of heat exchanger performance not only enhances the heat transfer and reduces thermal resistance, but also saves energy and reduces environmental pollution, which has an important economic value and social benefits in today＇s growing energy shortages. In this paper, the principle of equipartition of entransy dissipation and temperature difference in reference were improved by the method of programming iteration, which could be combined with practical application better, based on the two improved principles, the optimization effect were analyzed and compared in view of the carbon dioxide at different inlet mass flow. The results showed that the principle of equipartition of entransy dissipation was better than the principles of equipartition of temperature difference from availability and entransy dissipation number, so the heat transfer efficiency was also better.