Showing papers by "Eric W. Lemmon published in 2007"
02 Apr 2007
3,356 citations
TL;DR: In this article, a computer-controlled high temperature, high pressure vibrating-tube densimeter system was used to measure densities, vapor pressure and critical point for dimethyl ether.
82 citations
TL;DR: Two major software enhancements to TDE are described: generation of equation of state (EOS) representations on demand and establishment of a dynamically updated experimental data resource for use in the critical evaluation process.
Abstract: ThermoData Engine (TDE) is the first full-scale software implementation of the dynamic data evaluation concept, as reported recently in this journal. The present paper describes two major software enhancements to TDE: (1) generation of equation of state (EOS) representations on demand and (2) establishment of a dynamically updated experimental data resource for use in the critical evaluation process. Four EOS formulations have been implemented in TDE for on-demand evaluation: the volume translated Peng−Robinson, modified Sanchez-Lacombe, PC-SAFT, and Span Wagner EOS. The equations are fully described with their general application. The class structure of the program is described with particular emphasis on special features required to implement an equation, such as an EOS, that represents multiple properties simultaneously. Full implementation of the dynamic data evaluation concept requires that evaluations be based on an up-to-date “body of knowledge” or, in the case of TDE, an up-to-date collection of...
57 citations
TL;DR: In this article, the authors present a survey of the thermodynamic properties of normal hydrogen and parahydrogen and give comparisons of properties calculated from the standard models to available experimental data.
Abstract: This article presents a survey of the thermodynamic properties of normal hydrogen and parahydrogen and gives comparisons of properties calculated from the standard models to available experimental data. Motivated by the fact that the currently accepted standards for the thermodynamic properties of hydrogen were based on experimental and correlation work completed before the mid-1980s, an assessment of the accuracy of property values for analysis and design of new systems at high and low temperatures and pressures is provided. Property values measured and published after the completion of the current standards for both normal hydrogen and parahydrogen are included in the comparisons. Recommendations for new experimental data needed and for new thermodynamic property formulations for normal hydrogen and parahydrogen are included.
39 citations