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Transient formulation for evaluating convective coefficients in regenerative exchangers with hygroscopic channels
International Communications in Heat and Mass Transfer ( IF 7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.icheatmasstransfer.2020.104691
S.M.D. Santos , L.A. Sphaier

Abstract A transient two-dimensional model for coupled heat and mass transfer in channels with hygroscopic walls has been developed. The formulation employs a generalized form that is valid for both circular tubes and parallel-plates channels with walls composed of a desiccant material that can physically adsorb humidity from a moist airstream. The model equations are normalized in terms of physically relevant dimensionless groups, and then solved using a computational implementation based on the Numerical Method of Lines (NUMOL) using the Finite Volumes Method (FVM) for the spatial discretization. Validation results are presented by comparing the periodic solutions of the proposed formulation with experimental data for two different cases, showing very good agreement. Finally, illustrative results of the proposed formulation are presented for two typical situations found in desiccant wheel applications: dehumidification and regeneration. An analysis of the simulated data shows that the convective coefficients can strongly depend in both space and time, which suggests that lumped models based on constant convective coefficients for simulating desiccant and enthalpy wheels should be used with care.

中文翻译:

用于评估具有吸湿通道的再生交换器中的对流系数的瞬态公式

摘要 建立了具有吸湿壁的通道中耦合传热传质的瞬态二维模型。该配方采用通用形式,适用于圆管和平行板通道,其壁由干燥剂材料组成,可以从潮湿的气流中物理吸附湿气。根据物理相关的无量纲组对模型方程进行归一化,然后使用基于线的数值方法 (NUMOL) 的计算实现求解,使用有限体积方法 (FVM) 进行空间离散化。验证结果是通过将所提出的公式的周期解与两种不同情况的实验数据进行比较来呈现的,显示出非常好的一致性。最后,针对在干燥剂轮应用中发现的两种典型情况:除湿和再生,提出了建议配方的说明性结果。对模拟数据的分析表明,对流系数在空间和时间上都具有很强的依赖性,这表明应谨慎使用基于恒定对流系数的集总模型来模拟干燥剂和焓轮。
更新日期:2020-07-01
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