Effectiveness Ntu: Counterflow
0.75 1.5 to 1.00 1.5
Heat exchanger effectiveness (ε) vs. number of transfer units (NTU) and capacity ratio (Cr = Cmin/Cmax) for seven flow configurations: parallel-flow, counterflow, shell-and-tube 1-pass, shell-and-tube 2-pass, crossflow both unmixed, crossflow Cmin mixed, crossflow Cmax mixed. Data digitized from Incropera Figures 11.10-11.15.
| hx configuration | sk | capacity ratio (dimensionless) | effectiveness (dimensionless) | ntu (dimensionless) |
|---|---|---|---|---|
| Counterflow | 0.75 1.5 | 0.75 | 0.64 | 1.5 |
| Counterflow | 0.75 2.0 | 0.75 | 0.71 | 2 |
| Counterflow | 0.75 2.5 | 0.75 | 0.77 | 2.5 |
| Counterflow | 0.75 3.0 | 0.75 | 0.82 | 3 |
| Counterflow | 0.75 4.0 | 0.75 | 0.88 | 4 |
| Counterflow | 0.75 5.0 | 0.75 | 0.92 | 5 |
| Counterflow | 1.00 0.0 | 1 | 0 | 0 |
| Counterflow | 1.00 0.5 | 1 | 0.33 | 0.5 |
| Counterflow | 1.00 1.0 | 1 | 0.5 | 1 |
| Counterflow | 1.00 1.5 | 1 | 0.6 | 1.5 |
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