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Effectiveness NTU Calculator
Heat exchanger effectiveness from NTU and capacity ratio, counterflow or parallel flow.
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Heat exchanger effectiveness
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Heat exchanger effectiveness from NTU and capacity ratio, counterflow or parallel flow.
Effectiveness NTU Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Counterflow: e eq (1-exp(-NTU(1-Cr)))/(1-Cr exp(-NTU(1-Cr))).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Effectiveness Quick Guide
Typical values for reference.
| NTU | Cr | Flow type | Effectiveness |
|---|---|---|---|
| 2 | 0.5 | 1 | 77.5% |
| 1 | 0.25 | 1 | 59.8% |
| 3 | 0.75 | 2 | 56.8% |
| 5 | 1 | 1 | 83.3% |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Effectiveness NTU Calculator FAQ
Answers to common questions about this calculator.
Number of transfer units, UA divided by the minimum heat capacity rate.
The ratio of minimum to maximum heat capacity rates.
Counterflow gives higher effectiveness for the same NTU.
It uses standard textbook relations for ideal exchangers.