Modeling air-to-air plate-fin heat exchanger without dehumidification
Modeling air-to-air plate-fin heat exchanger without dehumidification
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DOI：
10.1016/j.applthermaleng.2018.07.064
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发表时间：
2018-10-01
影响因子：
6.4
通讯作者：
Zhou, X.
中科院分区：
文献类型：
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作者：
Zhou, G.;Ye, Y.;Zhou, X.
在暖通空调系统中，空气-空气板翅式换热器可以作为热回收装置，降低建筑能耗。然而，现有的热交换器模型在模拟空气-空气PFHE的性能方面存在局限性。例如，一些模型采用传热相关性，不适合PFHE，而其他需要详细的几何数据，通常是难以访问等，为了解决这些限制，我们开发了一个新的模型，为空-空PFHE无泄漏。基于空-空型PFHE的经验关联式，建立了PFHE的传热和流阻数学模型。新模型考虑了变化的空气流速和温度的影响。此外，它只需要现成的标称参数作为输入，不需要任何几何数据。此外，不需要数值离散化来求解方程，这使得该模型在计算上比使用有限元方法的模型更有效。为了评估新模型的性能，它是使用面向对象的，基于方程的建模语言Modelica。算例表明，新模型预测结果与实验数据的相对偏差小于10%。
In heating, ventilation and air-conditioning (HVAC) systems, air-to-air plate-fin heat exchangers (PFHEs) can be used as heat recovery devices to reduce the building energy consumption. However, existing heat exchanger models have limitations in simulating the performance of air-to-air PFHEs. For example, some models adopt heat transfer correlations which are not suitable for PFHEs, while others require detailed geometric data which are usually difficult to access, etc. To address these limitations, we developed a new model for air-to-air PFHE without dehumidification. Based on empirical correlations dedicated to air-to-air PFHEs, the mathematical models of the heat transfer and the flow resistance were built. The new model considers the impacts of the changing air flow rates and temperatures. Additionally, it only requires readily available nominal parameters as inputs and does not need any geometric data. Furthermore, no numerical discretization is needed to solve the equations, which makes the model computationally more efficient than models using the finite-element method. To evaluate the performance of the new model, it is implemented using an object-oriented, equation-based modeling language Modelica. Case studies show that the new model can predict the results with a relative deviation less than 10% compared to the experimental data.