thermal coefficient (U)
thermal coefficient (U)
(OP)
thermal coefficient (U)
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RE: thermal coefficient (U)
What is its relationship to water flow rate given that the U value goes down if the flow rate goes down, anybody got a formula governing this.
RE: thermal coefficient (U)
RE: thermal coefficient (U)
HVAC68
RE: thermal coefficient (U)
If, in this case, it is air, negligible improvement could be obtained by increasing the linear velocity of the water while already keeping it in the usually turbulent flow regime.
This is because U is always lower than the lowest HTC values in the heat transfer equipment. Kindly recall that by definition
thus always: U < h (the lowest).
RE: thermal coefficient (U)
Try to get your hands on ARI Standard(ARI 410-2001) that deals with forced circulation air cooling and air heating coils. You can download it for free from http://www.ari.org/std/standards.html along with other good standards. There is good amount of data and performance prediction with respect to air side parameter changes but one graph discusses the performance of coil with respect to water velocity.
Regards,