Dr. Lemmon received his Ph.D. at the University of Idaho in 1996. The dissertation introduced a new Helmholtz energy model for mixtures of hydrocarbons, cryogens, and refrigerants based on a generalized excess Helmholtz energy concept. His current work focuses on the Refprop program (www.nist.gov/srd/nist23.cfm) and on national and international standards for the properties of natural gas.
He is the chair of the ISO committee that will publish the next standard for the nist-equation of state for these mixtures. Dr. Lemmon has developed many nist-equations of state and a new nonlinear fitting technique that allows operations that are not available in linear methods. This has resulted in much smaller nist-equations that extrapolate without limits in all directions.