“logarithmic mean temperature difference”的概念、定义、翻译、参考文献-科学参考

logarithmic mean temperature difference

Chemical Engineering

A temperature driving force applied to the heat transfer between fluids with constant heat capacities. It is applied to fluids that transfer heat in countercurrent directions and is determined from the difference in the temperature difference in fluid temperatures at either end of the heat exchanger divided by the natural logarithm of the ratio of the same two temperature differences:
$Δ T_{l M} = \frac{(T_{3} - T_{2}) - (T_{4} - T_{1})}{\ln (\frac{(T_{3} - T_{2})}{(T_{4} - T_{1})})}$

It should not be used where the overall heat transfer coefficient varies appreciably, with multipass heat exchangers, nor where heat is generated such as on one side of the heat transfer surface as in an exothermic reaction in a water-cooled reactor (see Fig. 27).
Fig. 27 Log mean temperature difference

单词	logarithmic mean temperature difference
释义	logarithmic mean temperature difference Chemical Engineering A temperature driving force applied to the heat transfer between fluids with constant heat capacities. It is applied to fluids that transfer heat in countercurrent directions and is determined from the difference in the temperature difference in fluid temperatures at either end of the heat exchanger divided by the natural logarithm of the ratio of the same two temperature differences: $Δ T_{l M} = \frac{(T_{3} - T_{2}) - (T_{4} - T_{1})}{\ln (\frac{(T_{3} - T_{2})}{(T_{4} - T_{1})})}$ It should not be used where the overall heat transfer coefficient varies appreciably, with multipass heat exchangers, nor where heat is generated such as on one side of the heat transfer surface as in an exothermic reaction in a water-cooled reactor (see Fig. 27). Fig. 27 Log mean temperature difference
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