SteamTab Duo by ChemicaLogic Corporation is a premium spreadsheet add-in software designed for thermodynamic and transport property generation of steam and water. Whether it is worth your money depends on your need for dual-formulation modeling (Scientific IAPWS-95 and Industrial IAPWS-IF97) within a single Excel or Mac environment. For specialized chemical, plant, and mechanical engineers, it eliminates manual curve-fitting, but cheaper or open-source alternatives exist for general users. SteamTab Family Comparison
ChemicaLogic offers three tiers of its software, depending on the historical and compliance scope required for your engineering audits. Feature / Tier SteamTab (Standard) SteamTab Duo SteamTab Quad Scientific Formulations IAPWS-95 only IAPWS-95 & NBS/NRC-84 Industrial Formulations IAPWS-IF97 IAPWS-IF97 & IFC-67 Primary Use Case High-accuracy research Dual commercial/academic projects Legacy plant audits & contract compliance Core Advantage Lower cost base Best balance of speed & rigor Maximum backward compatibility SteamTab Duo vs. The Competition 1. SteamTab Duo vs. Standard SteamTab
The Formulation Split: Standard SteamTab only utilizes the scientific IAPWS-95 formulation, which is incredibly accurate but computationally heavy.
The Duo Advantage: SteamTab Duo includes the industrial IAPWS-IF97 formulation, which uses algebraic approximations. This makes iteration speeds significantly faster for large-scale plant simulations or macro loops.
2. SteamTab Duo vs. Open-Source Excel Add-Ins (e.g., XSteam) SteamTab Duo Functions – ChemicaLogic Corporation
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