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For a thermodynamics simulation, a 1% error in enthalpy is a disaster. Your heat exchanger suddenly violates the laws of physics. Your cycle COP looks amazing—but it's a lie. NIST doesn't sue you; they make your science wrong.

Developed by the National Institute of Standards and Technology (NIST), REFPROP is the gold-standard software for calculating thermodynamic and transport properties of pure fluids and mixtures. download refprop 10

. This allows one individual to install the software on all their personal work machines, though not on shared servers. For a thermodynamics simulation, a 1% error in