Question 36. For A Heat Exchanger, Will The Overall Heat Transfer Coefficient Increase Along With An Increase In Lmtd (log Mean Temperature Difference) Around The Unit?
Answer : The overall heat transfer coefficient is generally weakly dependent on temperature. As the temperatures of the fluids change, the degree to which the overall heat transfer coefficient will be affected depends on the sensitivity of the fluid's viscosity to temperature. If both fluids are water, for example, the overall heat transfer coefficient will not vary much with temperature because water's viscosity does not change dramatically with temperature.
