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At this point, all of the same heat transfer effectiveness-NTU correlations will accurately predict the mass transfer performance, as long as the heat transfer terms in the definition of NTU have been replaced by the mass transfer terms, as shown above. Similarly, it follows that the definition of becomes:
The role of a heat exchanger is to transfer heat between two mediums, so the performance of the heat exchanger is closely related to energy or thermal efficiency. [11] A counter flow heat exchanger is the most efficient type of heat exchanger in transferring heat energy from one circuit to the other [citation needed].
Fin performance can be described in three different ways. The first is fin effectiveness. It is the ratio of the fin heat transfer rate (˙) to the heat transfer rate of the object if it had no fin. The formula for this is:
A heat exchanger in a steam power station contaminated with macrofouling. Fouling occurs when impurities deposit on the heat exchange surface. Deposition of these impurities can decrease heat transfer effectiveness significantly over time and are caused by: Low wall shear stress; Low fluid velocities; High fluid velocities
Heat transfer enhancement is the process of increasing the effectiveness of heat exchangers.This can be achieved when the heat transfer power of a given device is increased or when the pressure losses generated by the device are reduced.
In heat transfer, effectiveness is a measure of the performance of a heat exchanger when using the NTU method. ... Contrary to the term efficiency, the focus of ...
The heat transfer coefficient has SI units in watts per square meter per kelvin (W/(m 2 K)). The overall heat transfer rate for combined modes is usually expressed in terms of an overall conductance or heat transfer coefficient, U. In that case, the heat transfer rate is: ˙ = where (in SI units):
A heat exchanger is used for more efficient heat transfer or to dissipate heat. Heat exchangers are widely used in refrigeration, air conditioning, space heating, power generation, and chemical processing. One common example of a heat exchanger is a car's radiator, in which the hot coolant fluid is cooled by the flow of air over the radiator's ...
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