Effectiveness Ntu: Counterflow
0.50 1.0 to 0.75 1.0
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 | 0.50 1.0 | 0.5 | 0.56 | 1 |
| Counterflow | 0.50 1.5 | 0.5 | 0.69 | 1.5 |
| Counterflow | 0.50 2.0 | 0.5 | 0.77 | 2 |
| Counterflow | 0.50 2.5 | 0.5 | 0.83 | 2.5 |
| Counterflow | 0.50 3.0 | 0.5 | 0.88 | 3 |
| Counterflow | 0.50 4.0 | 0.5 | 0.94 | 4 |
| Counterflow | 0.50 5.0 | 0.5 | 0.97 | 5 |
| Counterflow | 0.75 0.0 | 0.75 | 0 | 0 |
| Counterflow | 0.75 0.5 | 0.75 | 0.34 | 0.5 |
| Counterflow | 0.75 1.0 | 0.75 | 0.52 | 1 |
What else is in Engineering Database
AI built for engineering. Searches the engineering database, performs calculations, gives source-backed engineering insights.
Get started for free ↗Reference Data375 engineering tablesMaterial properties, pipe and shape dimensions, code tables, and electrical ratings across mechanical, civil, chemical, electrical, materials, and manufacturing engineering.
Browse dataCalculatorsDeterministic engineering calculatorsSizing, checking, and conversion tools that run against the reference tables. Inputs are code-compliant, outputs are traceable to the source standard.
Browse calculators