Radiator Comparisons

  • #1

Main Question or Discussion Point

I need to compare two remote heat exchangers (HE) of the cross-flow finned tube air & glykol 37%. The HE vendors provided me with basic stat sheets from factory testing. My issue is that the volumetric flow rates for the factory testing are different from the cooling circuit I have to place the HE in. Is there a practical way for me to determine the performance of these HEs in my cooling circuit? This is a two circuit HE, but my concern is with the high temperature circuit.

Cooling circuit parameters known
temp in
temp out
flow rate
medium
heat to be dissipated
ambient temp = 122F

Heat exchanger parameters known from factory testing
temp in (both sides)
temp out (both sides)
air flow
face velocity
heat exchanged
flow rate
ambient temp = 122F

thank you for your help
 

Answers and Replies

  • #2
8,090
4,754
Yes, the equation for heat transferred is
Q=U\times Ar\times LMTD


Get the heat transfer coefficient U from the factory test. Then apply it to your conditions. You must be able to compute the LMTD independently.
 

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