小型燃气轮机的最佳微通道回热器

2008 Second International Conference on Thermal Issues in Emerging Technologies Pub Date : 1900-01-01 DOI:10.1109/THETA.2008.5167160

M. Baelmans, F. Rogiers, J. Van Eyndhoven, W. Voets

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引用次数: 4

摘要

基于热力学第一定律和热力学第二定律，评估了它们在小型燃气轮机回热器设计中的应用。结果表明，换热器的第一定律和第二定律循环效率以及Witte-Shamsundar效率与换热器压降有相似的关系。这就得到了水力直径比及其相关通道数比的设计关系。此外，本文还表明，当考虑到换热器入口温度时，Witte-Shamsundar效率只能作为整体最优回热器设计的良好近似。但随着换热器质量流密度的增大和压气机比的减小以及涡轮进口温度比的减小，近似性变差。评估了与全周期效率考虑的偏差。结论是，在小型应用(如1.5 kW PowerMems燃气轮机)中，使用Witte-Shamsundar效率来优化回热器需要仔细评估。

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Optimal micro channel recuperators for small-sized gas turbines

Thermodynamic efficiencies based on the first and second law of thermodynamics are assessed for their use in the design of recuperators in small-sized gas turbines. It is shown that the first and second law cycle efficiency as well as the Witte-Shamsundar efficiency for heat exchangers show a similar dependency on the heat exchanger pressure drops. This results in design relations for hydraulic diameter ratios and their related number of channels ratio. Further, it is shown that the Witte-Shamsundar efficiency focusing on heat exchanger inlet temperatures only can be used as a good approximation for the overall optimal recuperator design when also pressure drops over the recuperator are accounted for. However the approximation deteriorates with higher heat exchanger mass flow density and lower compressor ratio as well as with decreasing turbine inlet temperature ratio. Deviations from the full cycle efficiency considerations are assessed. It is concluded that the use of the Witte-Shamsundar efficiency for optimization of recuperators in small-sized applications like the 1.5 kW PowerMems gas turbine needs careful assessment.

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2008 Second International Conference on Thermal Issues in Emerging Technologies

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