“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
随便看	risk reduction risk retention risk sharing risk taking risk weighted assets r-isomer Risorgimento (1831–61) Riss Riss/Würm Interglacial Ritchey, George Willis (1864–1945) Ritchey–Chrétien telescope Ritchie, Dennis, MacAlistair (1941–2011) ritualization river river basin management river capture river continuum concept river grade riverine river profile river restoration river-sediment analysis River Styles framework river terrace river training