I'm trying to find detailed data about tube bundles heat exchangers design. Please help me.
Look up McAdams: Heat transfer.
If you want industrial grade information and are able to pay for it. Try the Tubular Exchanger Manufacturers Assn website: The have detailed standards for design and manufacture as well as software.
Tube bundle design is dictated by code and starts with fin area and materials. This determines the number of tubes and length, and then determines the size of the box, etc. Most companies have proprietary systems that do these calculations and then automatically design the unit and kick out a print package and all computer data and files required to build the box, such as plasma table programs, etc. Very highly automated system for most people.