On the Three-Parameter Representation of the Equation of State

Redlich, O.

doi:10.1021/i160055a020

Cited by 12 publications

(5 citation statements)

References 2 publications

(2 reference statements)

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“…The expression for the q1 of the cooling heat can be obtained after introducing the coefficients included in the approximation of the specific isochoric heat capacity of R-1234yf depending on the temperature. To model the thermophysical properties of working fluids, it is proposed [8,2] to use the Redlich-Kwong thermal equation of state:…”

Section: Methodsmentioning

confidence: 99%

New working fluids for the use of heat secondary sources in mining technologies

Kirsanov

Gupalo

Podoliak

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Production cost of mining enterprises can be significantly reduced when using secondary heat. A large volume of secondary heat sources has a temperature potential of no higher than 50°C. To generate additional electricity using secondary heat it has been proposed to use installations with the Rankine thermodynamic cycle in mining enterprises. The paper aim is to study the thermodynamic efficiency of using R-1234yf and R-744 in the equipment, which uses the secondary heat of mining technologies for evaporation of these working fluids. R-1234yf is a freon that belongs to the class of hydrofluoroolefins and has a much lower level of global warming potential than other ozone-depleting substances. R-744 is carbon dioxide, which belongs to a natural, non-toxic and non-flammable working substance. It has been determined that the thermodynamic efficiencies of using R-1234yf and R-744 are 10% and 6.3%, respectively. The thermodynamic efficiency has been calculated for the temperature range from 50° to 20°C, which is typical for a large volume of secondary heat sources in mining technologies.

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Section: Methodsmentioning

confidence: 99%

New working fluids for the use of heat secondary sources in mining technologies

Kirsanov

Gupalo

Podoliak

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…The Lables of Vargaftik (1979, which provide a systematic compilation of experimental results available to date, were used as the basis of comparison for most gases. errors of Equation (9) and the Redlich-Kwong, Beanie-Bridgeman and Redlich (1975) Equations, but are average absolute errors of the other equations of state as given by the authors. Table 3 provides a comparison of the errors of Equation (9) and other equations of state in similar applicable ranges.…”

Section: Application Of Equation (9) To Real Gasesmentioning

confidence: 94%

“…The average errors E , , shown in Table 3 are r.m.s. errors of Equation (9) and the Redlich-Kwong, Beanie-Bridgeman and Redlich (1975) Equations, but are average absolute errors of the other equations of state as given by the authors.…”

Section: Application Of Equation (9) To Real Gasesmentioning

confidence: 94%

An empirical equation of state for gases and vapours

Sandri

1987

Can J Chem Eng

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A simple pressure-explicit equation of state for gases and vapours is presented which contains eight empirical constants in addition to the gas constant. It has been applied to four substances and reproduces their behaviour very well over a wide range of temperature (several hundred degrees), density (up to critical) and pressure (maximum 600 to 900 bar). For application above critical temperature only, a shorter version of the equation is presented for four more substances. Simple expressions are derived for entropy and internal energy.On prCsente une tquation d'Ctat simple explicite en pression pour les gaz et les vapeurs contenant huit constantes en plus de la constante des gaz parfaits. Cette Cquation a t t t appliqute ti quatre substances dont elle reproduit parfaitement le comportement pour une large gamme de temptkature (plusieurs centaines de degrts), de densite Cjusqu'au point critique) et de pression (maximum de 600 51 900 bar.). Une version abrtgte de I'tquation, applicable aux temp6ratures sugrieures B la temphature critique, est Cgalement prCsent6e pour quatre substances suppltmentaires. Des expressions simples sont Ctablies pour I'entropie et I'tnergie interne.

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“…ðP þ a=V 2 Þ ðV À bÞ ¼ RT Other pressure-volume-temperature (PVT) relationships may be found in the literature; ie, Benedict, Webb, Rubin equations of state (4)(5)(6)(7); the Benedict, Webb, Rubin, Starling equation of state (8); the Redlich equation of state (9); and the Redlich-Kwong equation of state (10).…”

Section: Physical Propertiesmentioning

confidence: 99%

Propylene

Calamur¹,

Carrera²,

Staff³

2005

Kirk-Othmer Encyclopedia of Chemical Technology

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Propylene is an important industrial chemical used as a feedstock in the production of polypropylene, acrylonitrile, propylene oxide, 2‐propanol, alkylated fuels, and other chemicals. It is obtained from steam cracking in pyrolysis furnaces in olefins plants and in refinery catalytic‐cracking reactors. Distillation in multitray columns yields purities in excess of 99.5 wt%. The physical and chemical properties of propylene are well characterized. Under ambient conditions, it is a colorless gas and has anesthetic properties at high concentrations. Propylene is usually transported in the liquid state at high pressures. Proper precautions must be taken when handling propylene.

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On the Three-Parameter Representation of the Equation of State

Cited by 12 publications

References 2 publications

New working fluids for the use of heat secondary sources in mining technologies

New working fluids for the use of heat secondary sources in mining technologies

An empirical equation of state for gases and vapours

Propylene

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