Hi, I need to design a system of heat exchangers for a steady-state process. I have inlet temperatures of the fluids, the amount of heat that must be exchanged, the max flow ratio and other data. The objective is to reach the exchange area and the lenght of the shell. My problem is that I have not idea about how many heat exchangers I must put in series, Better said, I don't know how the number of heat exchangers in series afect to the areas and the lenghts, when all the heat exchangers must be the same. The heat exhcanger must have one shell pass and two tubes pass. Thanks.