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首页> 外文期刊>International Journal of Heat and Mass Transfer >Turbulent heat transfer optimization for solar air heater with variation method based on exergy destruction minimization principle
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Turbulent heat transfer optimization for solar air heater with variation method based on exergy destruction minimization principle

机译：基于火用破坏最小化原理的变分法优化太阳能热水器湍流传热

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摘要

In this paper, a heat transfer optimization approach is brought in with focusing on exergy destruction to properly deal with the trade-off between irreversibility of heat transfer process and pump power consumption in turbulent flow for solar air heater. Thus, the exergy destruction minimization principle is mathematically extended to three dimensional turbulent flow and governing equations are derived with variation method. Successively, the optimized flow field for solar air heater is obtained at Re = 12,000 by applying SST k-omega turbulence model. Furthermore, with detail analysis of velocity and temperature distribution, it is found that the longitudinal swirl flow is generated through this optimization approach. Besides, within the scope of this study, the total heat transfer exergy destruction and average absorber temperature are maximally decreased by about 65% and 30 K respectively in the test section compared with the plain duct. And the maximum Nusselt number and friction factor are increased to 1.81 and 3.13 times over plain duct respectively. These results indicate that the optimization approach is effective for improving the thermal-hydraulic performance of solar air heater. Finally, the inclined vortex plate is designed to realize this kind of optimized flow field successfully. This work will promote technique developments of solar air heater. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在本文中，引入了一种热传递优化方法，其重点在于火用破坏，以妥善处理热交换过程的不可逆性与太阳能空气加热器湍流中泵功率消耗之间的权衡。因此，将能动破坏最小化原理在数学上扩展到了三维湍流，并用变分法推导了控制方程。通过应用SSTk-ω湍流模型，连续获得Re = 12,000的太阳能空气加热器的优化流场。此外，通过对速度和温度分布的详细分析，发现通过这种优化方法可以产生纵向涡流。此外，在本研究的范围内，与普通管道相比，测试段的总传热本能破坏和平均吸收器温度分别最大降低了约65％和30K。最大Nusselt数和摩擦系数分别比平管高1.81倍和3.13倍。这些结果表明，该优化方法对于提高太阳能空气加热器的热工水力性能是有效的。最后，设计了倾斜涡流板，成功实现了这种优化的流场。这项工作将促进太阳能空气加热器的技术发展。 （C）2019 Elsevier Ltd.保留所有权利。

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