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Estimate effectiveness, heat rate, qmax, capacity-rate ratio, and outlet temperatures using basic epsilon-NTU relationships.
Heat-exchanger effectiveness
0.660576
Unit-normalization summary: SI base units; counterflow
counterflow epsilon-NTU relationship
counterflow epsilon-NTU relationship
Outlet temperatures are estimated from a basic energy balance using the calculated effectiveness.
Heat-exchanger effectiveness is actual heat transfer divided by the maximum thermodynamically possible rate. The effectiveness-NTU method combines heat-capacity rates, their ratio, exchanger arrangement, and overall conductance when outlet temperatures are not all known.
Heat Exchanger Effectiveness Calculator applies this concept to its defined inputs and workflow. This effectiveness calculator supports parallel flow, counterflow including Cr = 1, and one-side phase-change Cr = 0 limiting cases. Its governing relationship or workflow is stated as follows: Parallel-flow, counterflow, and one-side phase-change effectiveness-NTU relationships.
The calculator evaluates Calculation mode, Temperature difference, and Display precision and returns Effectiveness NTU, base-unit normalization, formula substitution, and calculation steps using the stated method. The selected units and sign or reference conventions must describe one consistent physical case. Users should interpret the output within the assumptions shown on the page and repeat the check with trusted reference values when the result affects engineering or research decisions. Thermal properties are treated as constant user-entered values.
| Symbol | Meaning | Unit |
|---|---|---|
| epsilon | Heat-exchanger effectiveness | - |
| NTU | Number of transfer units | - |
| Cmin, Cmax | Capacity rates | W/K |
| qmax | Maximum possible heat transfer | W |
The effectiveness calculator supports parallel flow, counterflow including Cr = 1, and one-side phase-change Cr = 0 limiting cases.
This tool is intended for educational, estimation, and preliminary engineering use. Always verify critical heat-transfer calculations with applicable standards, validated software, measured properties, and qualified professional judgment before using results in real design, manufacturing, construction, safety, or compliance decisions.
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