3、tthermodynamiccalculation,tochoicetheheatexchangertubesnumberanddiametertomeetthedemandofheattransfer.ThenuseGB151-2014andGB150-2011ontheshelltube,tubesheet of structuredesignandstrengthcalculationincludesmaterialselection,determinetheconcretesize, thecalculation totheopeningre