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Chapter 2 – Calculations of the Temperature Differences LMTD and CMTD 收藏

第2章 - 的温差LMTD和CMTD的计算

原文求助

作者

M. Nitsche, R.O. Gbadamosi

关键词

Bypass stream; Corrected effective mean temperature difference (CMTD); Logarithmic mean temperature difference (LMTD); Mean weighted temperature difference (WMTD); Outlet temperatures; Temperature efficiency factor (F)

关键词译文

旁路流;修正有效平均温差（CMTD）;数平均温差（LMTD）;加权平均温差（WMTD）;出口温度;温度效率系数（F）

发布日期

30 September 2015

页码

21-35

来源信息

Heat Exchanger Design Guide ISBN：9780128037645, 2016年, 21-35页

摘要

First the logarithmic mean temperature difference (LMTD) for equipments with ideal countercurrent stream is derived. In multipass heat exchangers with nonideal countercurrent stream, the LMTD must be converted to the corrected effective mean temperature difference (CMTD) with the temperature efficiency factor F. It is shown how the temperature efficiency factor F can be graphically determined or how the CMTD can be calculated. Also, the effect of the bypass streams on the temperature difference LMTD and the determination of the mean weighted temperature difference for curved condensation curves are explained. Finally, the heat exchanger outlet temperature for a given heat exchanger is determined.

摘要译文

第一与理想逆流流设备的对数平均温差（LMTD）被derivedIn与非理想的逆流流多通路热交换器，所述LMTD必须随温度的效率因子的Flt被转换成校正后的有效平均温差（CMTD）示出了如何将温度效率因子F可以图形确定或CMTD如何可以calculatedAlso，关于温差LMTD和平均加权温差为弯曲缩合曲线的判定旁路流的效果是explainedFinally ，对于给定的热交换器热交换器出口温度被确定

M. Nitsche, R.O. Gbadamosi. Chapter 2 – Calculations of the Temperature Differences LMTD and CMTD. Heat Exchanger Design Guide[M].NL: Elsevier, 2016: 21-35