Heat exchanger effectiveness relations

N = NTU =

Eq1.gif (1089 bytes)

  C =

Eq2.gif (1050 bytes)
Flow geometry Relation
Double pipe Parallel flow HX1.gif (1360 bytes)
Counterflow HX2.gif (1588 bytes)
Cross flow Both fluids unmixed HX3.gif (1607 bytes)
Both fluids mixed HX4.gif (1785 bytes)
Cmax.gif (951 bytes)mixed Cmin.gif (949 bytes)unmixed HX5.gif (1492 bytes)
Cmax.gif (951 bytes)unmixed Cmin.gif (949 bytes)mixed HX6.gif (1538 bytes)
Shell and tube One shell pass; two, four, six tube passes HX7.gif (2354 bytes)