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Q is the exchanged heat duty , U is the heat transfer coefficient (watts per kelvin per square meter), A is the exchange area. Note that estimating the heat transfer coefficient may be quite complicated. This holds both for cocurrent flow, where the streams enter from the same end, and for countercurrent flow, where they enter from different ends.
describes heat transfer across a surface = Here, is the overall heat transfer coefficient, is the total heat transfer area, and is the minimum heat capacity rate. To better understand where this definition of NTU comes from, consider the following heat transfer energy balance, which is an extension of the energy balance above:
Custody transfer measurement: Back allocation to field or well, ownership allocation Flow into and out of an intermediate fluid storage: Custody transfer measurement: Back allocation to field or well Flow to consumption, power, flare: Fiscal measurement: N/A Flow to shared facility, from a satellite field: Custody transfer measurement (when ...
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):
Heat is the flow of thermal energy driven by thermal non-equilibrium, so the term 'heat flow' is a redundancy (i.e. a pleonasm). Heat must not be confused with stored thermal energy, and moving a hot object from one place to another must not be called heat transfer. However, it is common to say ‘heat flow’ to mean ‘heat content’. [1]
Convection (or convective heat transfer) is the transfer of heat from one place to another due to the movement of fluid. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow ).
Articles in the engineering field of heat transfer, including the mechanisms of radiation, convection, conduction. The main article for this category is Heat transfer . Wikimedia Commons has media related to Heat transfer .
Frontiers in Heat and Mass Transfer is a peer-reviewed open access scientific journal covering heat transfer and mass transfer. It is published by Tech Science Press and the editors-in-chief are Amir Faghri (University of Connecticut) and Yuwen Zhang (University of Missouri). In 2017, Frontiers in Heat Pipes was merged into this journal. [1]