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eng.heat-exchanger-NTU-epsilon Calculator
Calculates heat exchanger effectiveness using the NTU-epsilon method from heat transfer area, UA value, and fluid capacity rates. Effectiveness-NTU method avoids iteration compared to LMTD — it directly gives heat transfer rate from terminal conditions without solving for exit temperatures.
Inputs
M Hot Kg S
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Cp Hot J Kgk
Reference formula or conversion factor shown for context.
M Cold Kg S
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Cp Cold J Kgk
Reference formula or conversion factor shown for context.
U W M2K
Reference formula or conversion factor shown for context.
A M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
NTU (number of transfer units)
Sample size or count used in the calculation.
effectiveness ε
Sample size or count used in the calculation.
heat capacity rate ratio Cr
The proportional relationship between two quantities.
Cmin (W/K)
Sample size or count used in the calculation.
NTU = U·A/Cmin
Sample size or count used in the calculation.
max heat transfer (at ΔT=50K, kW)
Thermal energy moving from hot to cold. Rate depends on temperature difference, conductivity, and geometry (Fourier's Law for conduction; Newton's Law of Cooling for convection).