Nist fluid properties

Official websites use. Share sensitive information only on official, secure websites.

Official websites use. Share sensitive information only on official, secure websites. It has proven to be an extremely useful tool used by industry, government, and academia, and it is a primary method for the dissemination of work done by the Thermophysical Properties of Fluids Group. REFPROP is a computer program, distributed through the Standard Reference Data program of NIST, that provides thermophysical properties of pure fluids and mixtures over a wide range of fluid conditions including liquid, gas, and supercritical phases. It contains critically evaluated mathematical models, with the goal of representing the properties to within the uncertainty of the underlying experimental data used in their development.

Nist fluid properties

Official websites use. Share sensitive information only on official, secure websites. Author s Eric W. Abstract These tables give thermodynamic and transport properties of a variety of fluids, as generated from the equations of state presented in the references below. All extensive properties are given on a mass basis. Not all properties are included for every substance. The references should be consulted for information on the uncertainties and the reference states for E, H, and S. Values are first given along the saturation line. The first two points are the properties at the triple point. The final line gives the properties at the critical point. Two lines are given for each temperature except at the critical point ; the first line gives the values of the liquid phase note the high density and the second line gives the values of the vapor phase at low densities. Following the saturation tables, values are given as a function of temperature for several isobars. A duplicate entry in the isobar section indicates a phase transition liquid-vapor at that temperature; property values are then given for both phases. The phase can be determined by noting the sharp decrease in density between two successive temperature entries; all lines above this point refer to the liquid phase, and all lines below refer to the gas phase. If there is no sharp discontinuity in density, all data in the table refer to the supercritical region i.

Created April 22,Updated June 2, The references should be consulted for information on the uncertainties and the reference states for E, nist fluid properties, H, and S. Data, 61 8 ,

Regret for the inconvenience: we are taking measures to prevent fraudulent form submissions by extractors and page crawlers. Box , P. Received: May 20, Published: August 28, Citation: Marzouk OA. Thermo physical chemical properties of fluids using the free NIST chemistry web book database.

Official websites use. Share sensitive information only on official, secure websites. This program, developed by the National Institute of Standards and Technology NIST , calculates the thermodynamic and transport properties of industrially important fluids and their mixtures. These properties can be displayed in Tables and Plots through the graphical user interface; they are also accessible through spreadsheets or user-written applications accessing the REFPROP dll. It implements three models for the thermodynamic properties of pure fluids: equations of state explicit in Helmholtz energy, the modified Benedict-Webb-Rubin equation of state, and an extended corresponding states ECS model. Mixture calculations employ a model that applies mixing rules to the Helmholtz energy of the mixture components; it uses a departure function to account for the departure from ideal mixing. Viscosity and thermal conductivity are modeled with either fluid-specific correlations, an ECS method, or in some cases the friction theory method. Skip to main content. Search Term.

Nist fluid properties

Official websites use. Share sensitive information only on official, secure websites. Property measurements of the very highest accuracies are important for developing the thermodynamic and transport property models for working fluids and reference fluids. More than simply providing data for a high-accuracy equation for, say, a refrigerant, our work, in collaboration with our theoretical colleagues, advances fluid property theory in general. This is the concept of a reference fluid—extensive, high-accuracy data on key fluids allow the development of improved equations of state for the calculation of thermodynamic properties and transport property models. These reference fluid formulations characterize the behavior of broad ranges of chemically similar fluids; in this way data on propane, for example, are used to improve the property models for a broad range of hydrocarbons that have limited data. State-of-the art property measurements have been the hallmark of the Fluid Properties Group for more than four decades. Many of these measurements have been carried out on one-of-a-kind instruments developed at NIST. In some cases the older instruments are still among the very best of their kind, and we continue to use them. We have also developed new instruments in recent years that have advanced the state of the art.

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This is an open access article distributed under the terms of the, which permits unrestricted use, distribution, and build upon your work non-commercially. These HFC fluids are used in many applications including refrigeration and air conditioning, the manufacture of insulation materials, and as working fluids in power cycles that are used in geothermal and solar applications. Richardson, I. In addition, our researchers are involved in work to improve the representation of mixtures comprising fluids in natural gas. Fluid Mechanics Research International Journal. Data, 61, , Meyer, C. DOI: Its use is simple, and it offers the user multiple options for the unit to be used for each individual property. For fluids, some temperature-dependent properties can be displayed in a tabular form or as an interactive graph which can be saved as a PNG image file shown in Figure License: See this page for license information. It implements three models for the thermodynamic properties of pure fluids: equations of state explicit in Helmholtz energy, the modified Benedict-Webb-Rubin equation of state, and an extended corresponding states ECS model. Publisher Info. Publication Ethics.

Official websites use. Share sensitive information only on official, secure websites. It has proven to be an extremely useful tool used by industry, government, and academia, and it is a primary method for the dissemination of work done by the Thermophysical Properties of Fluids Group.

US Department of Commerce. Muzny, C. Didn't find what you're looking for? The user can select from a variety of units, flash calculations, properties, tables and plots. Mylona, S. REFPROP contains fluids that can be used as propellants, and fluids that can be used to model the atmosphere on our neighboring planets. Richter, M. Public: This dataset is intended for public access and use. It contains critically evaluated mathematical models, with the goal of representing the properties to within the uncertainty of the underlying experimental data used in their development. Interested readers are encourages to explore the multitude of facets of the database, which go beyond traditional macroscopic properties, such as density, heat capacity, viscosity, thermal conductivity, specific enthalpy, phase-change temperatures, and enthalpy of combustion. Standard Reference Data. User Guide. The database provides the users molecular-level or atomic-level data, such as ionization energy, electron affinity, proton affinity, cluster ion binding energies, infrared IR spectra, ultraviolet UV and visible Vis spectrum, constants of diatomic molecules, and gas chromatography.