Heat Exchangers – Typical Old Fashion design
1) Define duty: heat transfer rate, flows, temperatures.
2) Collect required physical properties (ρ, μ, k).
3) Decide on the type of exchanger.
4) Select a trial value for U.
5) Calculate the mean temperature difference, ΔTm
6) Calculate area required.
7) Decide on the exchanger layout.
8) Calculate individual coefficients.
9) Calculate U. If significant difference from step (4), substitute in (4) and repeat.
10) Calculate the pressure drop. If it is not satisfactory, back to (7) or (4) or (3). 11) Optimize: repeat (4) to (10) to determine cheapest solution (usually smaller area).