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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation of thermal-hydraulic performance of discontinuous fin printed circuit heat exchangers for supercritical CO2 power cycles
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Experimental investigation of thermal-hydraulic performance of discontinuous fin printed circuit heat exchangers for supercritical CO2 power cycles

机译：用于超临界CO2电源循环的不连续翅片印刷电路热交换器热液压性能的实验研究

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摘要

The supercritical carbon dioxide (sCO(2)) Brayton cycles have the potential to attain higher cycle efficiencies than the conventional steam Rankine cycles. Using compact diffusion-bonded heat exchangers for thermal recuperation in sCO(2) Brayton cycles can lead to cost-effective, simple, and compact cycle footprint. This study focuses on the experimental thermal-hydraulic performance evaluation of a set of chemically etched discontinuous offset rectangular and airfoil fin surface patterns for use in diffusion bonded heat exchangers. Local and average heat transfer coefficients and pressure drops were measured for a wide range of operating conditions relevant to the sCO(2) Brayton cycles. Empirical correlations for the friction factor and the Nusselt number are proposed based on the experimental data. The friction factor correlations were able to reproduce the experimentally measured pressure drops with a standard deviation of +/- 13.5% and +/- 14.7% for the discontinuous offset rectangular and airfoil fins respectively. Nusselt number correlations were able to reproduce the experimental Nusselt numbers with standard deviation of +/- 15.4% and +/- 8% for the discontinuous offset rectangular and airfoil fins respectively.
机译：超临界二氧化碳（SCO（2））布雷顿循环具有比传统的蒸汽朗朗循环达到更高的循环效率。使用紧凑型扩散粘合的热交换器，用于在SCO（2）布雷顿循环中的热恢复可导致成本效益，简单，紧凑的循环占地面积。该研究专注于一组化学蚀刻的不连续偏移矩形和翼型翅片表面图案的实验热液压性能评估，用于扩散粘合的热交换器。针对与SCO（2）布雷顿周期相关的各种操作条件测量局部和平均传热系数和压降。基于实验数据提出了摩擦因子和营养数的经验相关性。摩擦因子相关性能够分别再现实验测量的压力下降，其标准偏差分别具有+/- 13.5％和+/- 14.7％的标准偏差分别用于不连续的偏移矩形和翼型翅片。 NUSERET数量相关性能够再现实验营养数，标准偏差分别具有+/- 15.4％和+/- 8％的标准偏差分别用于不连续的偏移矩形和翼型翅片。

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