is a free, open-source chemical process simulator that includes heat exchanger rating capabilities. HTRI Official Site:
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Automatically suggests 3–5 shell‑and‑tube or plate heat exchanger geometries based on user’s input (flow rates, inlet/outlet temperatures, allowable pressure drops, fluid properties). Unlike full HTRI, this free version would use simplified correlations (Bell‑Delaware method for shell side, simplified tube‑side heat transfer) and a pre‑screened library of standard TEMA sizes. is a free, open-source chemical process simulator that
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While you won't find a legitimate "free" full version on the web, here are the top legitimate ways to get your hands on HTRI resources and software access. 1. The HTRI Educational License