NTU–Effectiveness Method
Effectiveness ε of a heat exchanger from NTU and capacity-rate ratio Cr, for counter-flow and parallel-flow.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Overall conductance × area | kW/K | |
| Smaller of (m·cp) on each side | kW/K | |
| Number of transfer units | ||
| Effectiveness |
Source: Kays & London - Compact Heat Exchangers
In short
Effectiveness \u03b5 of a heat exchanger from NTU and capacity-rate ratio Cr, for counter-flow and parallel-flow.