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The variable speed tower curves model a sort of scaleable shape of the thermal performance and not the effectiveness of the tower. Generally, you only want your own curve if you're modeling a piece of technology that's not a traditional cross or counterflow cooling tower. To alter the heat transfer capabilities of the tower, you need to change the design approach temperature. For example, a tower with a design approach of 5F will provide more heat transfer than a tower with a design approach of 7F.