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12-02-2010, 02:55 PM #1
Overall heat transfer coeficcient fo ammonia heat exchanger
Hi guys:
I need to compute a coil for ammonia Heat exchanger
and i have the following dates:
Q = 400000 Kcal/h
T cold fluid = -22ºC (NH3)
T Hot fluid = -15 º C ( Brine sodium chloride)
IF i use
Q = (Tc - Th) x U X A
For calculate "A"
I need to Know "U" the overall heat transfer coefficient but The determination of U is often tedious and needs data not yet available in preliminary stages of the design somebody has typical values of U for quickly estimating the required surface area. I hope that somone can help me.
PD: This coil works in a flooded system.
Best regards.
Luis
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