What Is Heat Transfer Co-efficient?
Posted by admin on December 12, 2009 under Heat Transfer | 
2 Comments to Read
It is written”The fluid with low heat transfer co-efficient normally goes in shell circuit of a heat exchanger.” But why? Tell me the significance of heat transfer co-eeficient for a heat exchanger.
Why Fluid With Lower Heat Tr Coeff Normally Goes In Shell Of Exchanger?
shushi said,
The shell of the heat exchanger is often insulated to prevent heat loss and there is no point in using a material with good heat exchange abilities. On the other hand the materials where heat exchange is designed to take place require good heat transfer ability.
BHABENDRA KUMAR D said,
The overall heat transfer coefficient U is a measure of the overall ability of a series of conductive and convective barriers to transfer heat. It is commonly applied to the calculation of heat transfer in heat exchangers, but can be applied equally well to other problems.
For the case of a heat exchanger, U can be used to determine the total heat transfer between the two streams in the heat exchanger by the following relationship:
Q = UAΔTLM
where
Q = heat transfer rate (W)
U = overall heat transfer coefficient (W/(m²·K))
A = heat transfer surface area (m2)
ΔTLM = log mean temperature difference (K)
Th ecriteria specified by you with low Heat Transfer Co-efficient goes in shell is not always true.refer this:http://www.cheresources.com/designexzz.s…
So it depends many factors in addition to what you specified.
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