DESIGN OF HEAT EXCHANGERS
HX DESIGN PROCEDURE
5. Calculate heat transfer coefficients (α)
and overall heat transfer coefficient (U)
2. Determine heat duty
on tube and shell side
NO
3. Calculate effective corrected
temperature difference
Back to step 4
1. Collect base data
4. Select appropriate exchanger configuration
based on estimated U value
6. Does selected exchanger configuration
satisfy base data ?
YES
Develop technical
specification
Shell diameter / Tube size
Baffle spacing
Number of tubes and tube passes
DESIGN OF HEAT EXCHANGERS
HX DESIGN PROCEDURE
1 Determine flow rates, temperatures and the fluid property data
2 Determine the heat loads on tube and shell side
3 Determine the corrected effective temperature difference (CMTD)
4 Estimate the required heat exchanger area (A)
5 Select the appropriate HX equipment
6 Determine the flow velocity
DESIGN OF HEAT EXCHANGERS
HX DESIGN PROCEDURE
7 Determine the convective heat transfer coefficients on the tube and shell side
8 Determine the overall heat transfer coefficient U
9 Calculate the actual heat load of the selected heat exchanger and compare with the U-value
for the required heat load
1 0 Check the excess and the fouling reserve
U
× 100� − 100
% reserve = �
Ureq