Heat Exchanger Design Methods
Q = U x A x LMTD
LMTD = (dT1 - dT2) / ln(dT1/dT2)
Effectiveness = Q_actual / Q_max
NTU = UA / C_min
- LMTD method: Best when all four temperatures are known
- NTU method: Best when outlet temperatures are unknown
- Counterflow is always more effective than parallel flow