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首页> 外文期刊>International journal of green energy >BETTER THERMAL CALCULATIONS USING MODIFIED GENERALIZED LEVEQUE EQUATIONS FOR CHEVRON PLATE HEAT EXCHANGERS
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BETTER THERMAL CALCULATIONS USING MODIFIED GENERALIZED LEVEQUE EQUATIONS FOR CHEVRON PLATE HEAT EXCHANGERS

机译：使用改进的广义水平方程对雪弗板换热器进行更好的热计算

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摘要

Plate heat exchangers are becoming vital process energy exchange equipment in chemical industries. The present work looks into the applicability of the Generalized Leveque Equation (GLE), which is used to generate thermal performance calculations for chevron-type plates utilized in plate and frame heat exchangers. New Modified Generalized Leveque Equations are proposed to improve calculation accuracy, which will enhance energy utilization and cost reduction in the design stage. A case study was selected to examine the GLE applicability when implemented to pure and mixed chevron plates. The GLE and other modified equations are compared with known classical correlations for different corrugation angles of 30°, 45°, 50°, 60° and 65° as pure chevron plates, and 45°/90°, 23°/90°, 45°/ 45°, 23°/45°, and 23°/23° as mixed chevron plates. Both the GLE and single Modified Generalized Leveque Equation (MGLE) gave good results only for 30° and 50° pure chevron angles and failed to give acceptable results in 45°, 60° and 65° chevron angles; both, however, gave acceptable results with all tested mixed angles. Also, the GLE has the tendency to be more applicable in the laminar region where Re < 2100, but the inaccuracy increases when applied in the turbulent region, while MGLE gave slightly lower relative error at high Re. Based on the classification of soft and hard chevron plates, two new Modified Generalized Leveque Equations, MGLE(1) and MGLE(2), were developed from the set of Kumar's data for pure chevron plates. The proposed system of equations are capable of providing excellent results for both pure and mixed chevron angles when compared with a large set of classical correlations available in the literature.
机译：板式换热器正在成为化学工业中至关重要的过程能量交换设备。本工作探讨了广义Leveque方程（GLE）的适用性，该方程用于为板框式换热器中使用的V形板产生热性能计算。提出了新的改进的广义Leveque方程来提高计算精度，这将在设计阶段提高能源利用率并降低成本。选择了一个案例研究，以检查将其应用于纯人字形和混合人字形板时的GLE适用性。将GLE和其他修改后的方程与已知的经典相关性进行比较，以了解30°，45°，50°，60°和65°的不同波纹角（纯V型人字形板）以及45°/ 90°，23°/ 90°，45 °/ 45°，23°/ 45°和23°/ 23°作为混合人字形板。 GLE和单个修改的广义Leveque方程（MGLE）都仅在30°和50°的V形人字形角处给出了良好的结果，而在45°，60°和65°的V形人字形上均没有给出可接受的结果。但是，在所有测试的混合角度下，两者均给出了可接受的结果。同样，GLE倾向于更适用于Re <2100的层流区域，但是当应用于湍流区域时，不准确性会增加，而MGLE在高Re时的相对误差会略低。根据软和硬V形人字形板的分类，从纯人字形板的Kumar数据集中开发了两个新的修正的广义Leveque方程MGLE（1）和MGLE（2）。与文献中提供的大量经典相关项相比，所提出的方程组能够为纯人字形和混合人字形角提供出色的结果。

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