No court of engineering ethics will accept results from tampered software.

Here is a solid, professional post tailored for engineering audiences:

HTRI (Heat Transfer Research, Inc.) Xchanger Suite is the global industry standard for the design, rating, and simulation of heat exchangers. The suite includes highly specialized modules: For shell-and-tube heat exchangers. Xace: For air-cooled heat exchangers. Xphe: For plate-and-frame heat exchangers. Xfist: For fired heaters.

: HTRI offers discounted or specialized licensing programs for academic institutions to help students and researchers.