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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Experimental investigation of the heat transfer behaviors of CO2, propane and their binary non-azeotropic mixtures above critical pressure in helically coiled tube
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Experimental investigation of the heat transfer behaviors of CO2, propane and their binary non-azeotropic mixtures above critical pressure in helically coiled tube

机译：CO2，丙烷及其二元非共沸混合物在螺旋卷绕管中临界压力高于临界压力的实验研究

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摘要

The non-azeotropic natural mixture, propane/CO2, in trans-critical Rankine cycle shows some special advantages in operation safe, thermodynamic performance and exergo-economic performance. The improvement of the system performance depends on further in-depth investigation on the heat transfer of propane/CO2 mixture above critical pressure which has not been performed yet. In this paper, the heat transfer behaviors of CO2, propane and their non-azeotropic mixtures in helically coiled tube are investigated and compared by experiments. The mass fractions of the mixtures are measured by Fourier Transform Infrared Spectrometer. The effects of operating parameters under various mass fractions on heat transfer are discussed. The general law of mass fraction on heat transfer is got under the same pressure ratio (P/P) by experimental results. The peak of heat transfer coefficient increases as propane increases when the mass fraction of propane changes from 22.24% to 100%. The heat transfer coefficient of the mixtures has little variations with pressure because the specific heat of the mixtures has a slight decrease as pressure increases. The complicated heat transfer characteristics of the propane/CO2 mixtures are analyzed based on the buoyancy force and the thermal effect in heat surface. In the helically coiled tube, the heat transfer of the mixture is mainly dominated by curvature effect and the effect of the low-density in boundary layer becomes smaller and smaller as propane increases. The experimental data are predicted by a correlation. The results show that for various compositions, 80% of the data are predicted within 20%, and 95% are within 30%.
机译：无临界Qualine循环中的非共沸天然混合物，丙烷/二氧化碳在操作安全，热力学性能和exergo - 经济性能方面表现出一些特殊的优势。系统性能的提高取决于进一步深入研究丙烷/ CO2混合物的热传递尚未进行的临界压力。本文通过实验研究了CO2，丙烷及其非共沸混合物的传热行为，并通过实验进行了比较。通过傅里叶变换红外光谱仪测量混合物的质量分数。讨论了在传热下各种质量分数下的操作参数的影响。通过实验结果，在相同的压力比（P / P）下得到了传热对传热的一般规律。当丙烷的质量分数从22.24％到100％变化时，随着丙烷的增加，传热系数的峰值增加。混合物的传热系数几乎没有压力变化，因为混合物的比热量随着压力的增加而略有下降。基于浮力力和热表面中的热效应来分析丙烷/二氧化碳混合物的复杂传热特性。在螺旋盘绕管中，混合物的热传递主要通过曲率效应主导，随着丙烷的增加，边界层中低密度的效果变小且较小。通过相关性预测实验数据。结果表明，对于各种组合物，80％的数据预测在20％以内，95％在30％以内。

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