The properties of water substance (vapor pressure, enthalpy, specific heat capacities and their ratio, viscosity, thermal conductivity, Prandtl number, speed of sound, thermal expansivity and surface tension) are tabulated at close temperature increments from −20°C to 50°C. Simple equations which accurately fit these values are given.
Two generalized correlations and a simple two-constant equation are evaluated for 25 pure refrigerant fluids. If two experimental data points are available, the simple equation was found to be preferable.
An alternative, possibly simpler, thermodynamic analysis of Rankine cycles is proposed.
An analytical relation is derived relating volumes on the spinodal of a Van der Waals gas.
Simple algebraic equations are given for the saturation vapour pressure, specific volume, enthalpy and entropy for temperatures of 0(5)30(10)100(25)200 (50)300°C and occasionally over a wider range. Similar equations for the specific heat capacity at constant pressure and an isothermal compressibility function are given for 0–30°C. Interpolating equations for temperatures between 0 and 30°C are given. Estimates of the accuracy of the fittings are usually given.
Simple equations for the thermodynamic efficiencies of ideal Otto, Diesel and Brayton cycles are derived for cycles with fixed ambient and upper temperatures, all resulting in equations containing the difference of the square roots of these temperatures.
A large amount of work on the equation of state of Refrigerant 134a (l, 1,1,2tetratluorethane) is current. For a survey to 1991, see [1]. The equations of state generated invariably present the pressure, P, as a function of density, p, or volume, V, and temperature, T. Isentropic and isenthalpic processes are of considerable interest in engineering as these enter in turbine and throttling calculations respectively. Such calculations are greatly facilitated by a functional of the form h = his, P). This is one of four fundamental thermodynamic potentials, which are described elsewhere, see, for example, [2-5]. From these all other thermodynamic properties can be derived and some comprehensive listings are available [2, 6] of the relations required in the derivations. The following presents an approximate analysis resulting in the equation h =(as + b) In P + (cs + d) which it is hoped will simplify calculations of isentropic work of compression, etc.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCollision Integrals for the Viscosity of Polar Gases.P. E. LileyCite this: J. Chem. Eng. Data 1960, 5, 3, 307–308Publication Date (Print):July 1, 1960Publication History Published online1 May 2002Published inissue 1 July 1960https://pubs.acs.org/doi/10.1021/je60007a020https://doi.org/10.1021/je60007a020research-articleACS PublicationsRequest reuse permissionsArticle Views82Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic Data for Carbon Dioxide at High Pressure and Temperature.P. E. LileyCite this: J. Chem. Eng. Data 1959, 4, 3, 238–241Publication Date (Print):July 1, 1959Publication History Published online1 May 2002Published inissue 1 July 1959https://pubs.acs.org/doi/10.1021/je60003a012https://doi.org/10.1021/je60003a012research-articleACS PublicationsRequest reuse permissionsArticle Views181Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts