PROperties of FIre Suppressant SYstems “PROFISSY” A Spreadsheet Application for Fire-Suppressant Bottle-Filling Calculations

Abstract

This report summarizes the results of work performed for US Army GVSC by the National Institute of Standards and Technology (NIST), Applied Chemicals and Materials Division on the development of a computer program for fire-suppressant bottle-filling calculations under interagency agreement number 11478007. The work includes the development of an Excel spreadsheet that is to be used with the NIST23 (REFPROP) to provide two bottle-filling calculations (1) given vessel size, mass of agent, mass of pressurizing agent, and filling temperature compute the filling pressure, and the temperature and pressure conditions at which the fluid in the vessel becomes single phase, and (2) given the vessel size, mass of agent, and filling temperature and pressure, compute the mass of pressurizing fluid, and the temperature and pressure conditions at which the fluid in the vessel becomes single phase. The agents

The NIST REFPROP Database for Highly Accurate Properties of Industrially Important Fluids

“…It is formulated in terms of properties such as the dipole moment, acentric factor, and critical temperature and pressure for each refrigerant pair. Another predictive method, applicable only to mixtures of nitrogen with selected halogenated refrigerants, incorporates the normal boiling point, the critical pressure, and the number of fluorine atoms in the molecule . REFPROP also estimates interaction parameters based on chemically similar pairs, for example the mixture of R-32/1234ze­(Z) (which has no experimental data available) is treated the same as the mixture R-32/1234ze­(E) (for which binary interaction parameters have been fitted to data).…”

“…Another predictive method, applicable only to mixtures of nitrogen with selected halogenated refrigerants, incorporates the normal boiling point, the critical pressure, and the number of fluorine atoms in the molecule. 311 REFPROP also estimates interaction parameters based on chemically similar pairs, for example the mixture of R-32/1234ze(Z) (which has no experimental data available) is treated the same as the mixture R-32/1234ze(E) (for which binary interaction parameters have been fitted to data). Research is currently underway to develop additional predictive models for the binary interaction parameters in Helmholtz mixture models in REFPROP.…”

Influence of Isomeric Composition and Sample Handling on the Liquid Density of Hydrofluorethers Measured by Vibrating Tube Densimeter at 0.1 MPa

“…The expanded (k = 2) relative deviation from the experimental data is lower than 0.2 % for all HFEs, except for HFE-7100 where the isomeric composition causes larger deviation. The new experimental data can be used in possible improvement of the preliminary multiparameter equations of state for HFE-7000 [34] and HFE-7100 [37] implemented in REFPROP [10], when especially the inŕuence of the isomeric composition of HFE-7100 should be taken into account.…”

“…Another preliminary multiparameter equation of state has been recently introduced for HFE-7100 (denoted also as RE449mccc) in the supplement of a publication by Huber and Lemmon [37]. Unlike in case of HFE-7000, the equation of state follows the trend of the density data by Rausch et al [2] over the entire temperature range as shown in őgure 5.…”

“…Figure 5: Relative deviation of the Rackett-type correlation(2) for HFE-7100 from the densities taken from literature[32,2,5,23,35,24,36,6], new measurements, correlation by 3M manufacturer[12] and the multiparameter equation of state by Huber and Lemmon[37]. Black dashed lines indicate the expanded relative deviation of Eq.…”