1.Calculate duty, the rate of heat transfer required.
2.If the specification is incomplete, determine the unknown fluid temperature or fluid flow rate from a heat balance.
3.Calculate the log mean temperature difference, ΔTlm.
4.Determine the log mean temperature correction factor, Ft.
5.Calculate the corrected mean temperature difference ΔTm = Ft x ΔTlm.
6.Estimate the overall heat transfer coefficient.
7.Calculate the surface area required.
8.Determined the number of plates required = total surface area/area of one plate.
9.Decide the flow arrangement and number of passes.
10.Calculate the film heat transfer coefficients for each stream.
11.Calculate the overall coefficient, allowing for fouling factors.
12.Compared the calculated with the assumed overall coefficient. If satisfactory, say -10% to +10% error, proceed. If unsatisfactory, return to step 8 and increase or decrease the number of plates.
13.Check the pressure drop for each stream.