换热器换热系数及CFD建模

David Mas, Sebastien Vimeux, B. Clauzade, Pierre Lucas, Francois Hochet, Vincent Melot, Damien Thuaud
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引用次数: 0

摘要

高精度的换热器性能评估是OTEC成功的关键因素之一。在OTEC工作条件下,特别是在低热流密度、低质量流密度和大尺寸条件下,采用现有的方法、模型和传热定律是不可能高精度地评估传热系数的。初步分析表明,传热是由热学和水力参数驱动的,这两个参数是相互关联的,因此需要精确建模2D或3D数值模型。因此,Naval energy和Naval Group定义并应用了一种传热鉴定方法,将基于ANSYS Fluent代码的3D CFD热水力模型与水/氨淹壳管式蒸发器的缩小尺寸测试相关联。结果达到了较高的期望值,两相流条件下淹没壳管式蒸发器壳侧传热系数的不确定度小于10%,将朗肯循环产电的不确定度降低到2%。
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Heat exchanger heat transfer coefficient and CFD modelling
Heat exchanger performance assessment with a high precision level is one of the key success factors for OTEC. Evaluating heat transfer coefficient with high precision in OTEC working conditions - specifically low heat flux, low mass flux, and large dimensions – is not possible by applying existing methods, models, and heat transfer laws. Initial analysis shows that heat transfer is driven by thermal and hydraulic parameters, which are linked, and therefore require 2D or 3D numerical models to be accurately modelled.Naval Energies and Naval Group have therefore defined and applied a heat transfer qualification method to correlate a 3D CFD thermo-hydraulical model based on ANSYS Fluent code with reduced scale testing on a water/ammonia flooded shell & tube evaporator. The results meet the high expectations as an uncertainty of less than 10% was achieved on the shell side heat transfer coefficient of the flooded shell & tube evaporator in 2-phase flow conditions, lowering the uncertainty of Rankine Cycle electrical production to 2%.
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