WHY THE GLOBAL COEFFICIENT FOR 3/8” GEOMETRY IS HIGHER, EVEN CONSIDERING THE LOWER COEFFICIENT OF THE FLUID SIDE, IN COMPARISON WITH THE ½” GEOMETRY? WHY THE PRESSURE DROP FLUID SIDE OF 3/8” GEOMETRY IS HIGHER THAN 1/2” IF THE FLUID SPEED I : Customer service UNILAB

WHY THE GLOBAL COEFFICIENT FOR 3/8” GEOMETRY IS HIGHER, EVEN CONSIDERING THE LOWER COEFFICIENT OF THE FLUID SIDE, IN COMPARISON WITH THE ½” GEOMETRY? WHY THE PRESSURE DROP FLUID SIDE OF 3/8” GEOMETRY IS HIGHER THAN 1/2” IF THE FLUID SPEED I Print

Modified on: Wed, Mar 30, 2016 at 4:17 PM

Regarding the Heat Exchange Coefficient, the calculation is correct because this coefficient doesn’t depend only from Partial Exchange Coefficients, but also from External/Internal Surface Ratio and Finned Surface Efficiency.

The formula used is this:

A = 1/(Partial Exchange Coefficient Air Side * Finned Surface Efficiency)

B = (External/Internal Surface Ratio) / (Partial Exchange Coefficient Fluid Side)

K = 1 / (A+B)

Also the pressure drops are right because they don’t depend only the velocity but from many other factors (Reynolds Number, Coils Lenght, Friction factor, ecc…).

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WHY THE GLOBAL COEFFICIENT FOR 3/8” GEOMETRY IS HIGHER, EVEN CONSIDERING THE LOWER COEFFICIENT OF THE FLUID SIDE, IN COMPARISON WITH THE ½” GEOMETRY? WHY THE PRESSURE DROP FLUID SIDE OF 3/8” GEOMETRY IS HIGHER THAN 1/2” IF THE FLUID SPEED I Print

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