Speed of sound and ideal-gas heat capacity of freon R-236ea

Komarov, S. G.; Gruzdev, V. A.; Stankus, S. V.

doi:10.1134/s0869864308030025

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…The calculations for freons R-125 and R-236еа are performed by the method considered above. Their thermodynamic parameters are presented in Table 1 [15,16].…”

Section: Resultsmentioning

confidence: 99%

“…1), respectively, m 3 /kg. In order to perform calculations using the formula (2) values υ 1 and υ 6 (specific volumes in a state of saturation of liquid and steam phases, respectively) for a specific freon are determined by reference data [15,16]. Temperature of freon on line "2-4" in a process of heating and evaporating is constant and equal to T 2 .…”

Section: Methodsmentioning

confidence: 99%

“…Constants of the Redlich-Kwong equation and isochoric thermal capacity for freons R-125 and R-236ea[15,16].…”

mentioning

confidence: 99%

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Estimation of usage efficiency of freon-steam turbines in mine energy complexes

et al. 2020

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Increase of operating efficiency of mine energy complexes is an actual scientific and technical problem. Systems that utilize energy of low-potential sources and have freon-steam turbines are suggested to be included in mine energy complexes. Principles of selection of freons as working fluids in energy systems are suggested in the paper. Usage of some thermal equations of state for defining thermal and physical properties of freons is analyzed. Equation of isentropic process for the thermal Redlich–Kwong equation of state is obtained. Calculation of energy efficiency of a system with a freon-steam turbine for selected variants of usage of working fluids is performed. A calculation method of thermodynamic parameters that are necessary for energy conversion efficiency estimation of specific freons in a system of useful utilization of energy is developed. Analysis of results indicates that usage of ozone-safe and fire-safe freons in energy utilization systems of low-potential sources with a possibility of utilization of additional waste heat, which was not used in the past, allows increasing the operating efficiency of mine energy complexes.

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“…The calculations for freons R-125 and R-236еа are performed by the method considered above. Their thermodynamic parameters are presented in Table 1 [15,16].…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Estimation of usage efficiency of freon-steam turbines in mine energy complexes

et al. 2020

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“…The methods used for measurement of the thermal properties have been described in previous publications [5][6][7]. The saturated vapor pressure (P S ) and the density (ρ v ) of the superheated vapor were measured with an isochoric piezometer of 439.35 cm 3 capacity.…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic Properties of HFC-236ea

et al. 2008

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The density of gaseous and liquid 1,1,1,2,3,3-hexafluoropropane (HFC-236ea) and the speed of sound in liquid HFC-236ea have been studied by a γ -attenuation technique, an ultrasonic interferometer, and an isochoric piezometer method over the temperature range of 263-423 K at pressures up to 4.05 MPa. The purity of the samples used throughout the measurements is 99.68 mol%. The pressures of the saturated vapor were measured over the same temperature range. The experimental uncertainties of the temperature, pressure, density, and speed-of-sound measurements were estimated to be within ±20 mK, ±1.5 kPa, ±(0.05-0.30)%, and ±(0.05-0.10)%, respectively.

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“…5). Here Cp 0 (Tm) is the ideal-gas heat capacity [15][16][17]. The heat capacity Cp 0 is a strictly additive quantity; therefore, it is easily calculated through the ideal-gas heat capacity of the components.…”

Section: Experimental Data and Their Generalizationmentioning

confidence: 99%

Thermal Conductivity Calculation Model for Refrigerant Mixtures in the Vapor Phase

Raschektaeva

Stankus

2023

Int J Thermophys

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45/55) in the gas phase are analysed. The thermal conductivity was studied with the same experimental setup, which improved the reliability of the results, excluding thereby systematic errors caused by using different methods to measure thermal conductivity. The reported experimental data have 1.5-2.5 % uncertainty. Equations for calculating thermal conductivity depending on temperature and pressure are given for each mixture. The equations for thermal conductivity on the dew line and in the ideal gas state are obtained. A model for predicting thermal conductivity on a wide range of state parameters is proposed based on obtained experimental data and the theory of thermodynamic similarity. A comparison of the experimental data with the calculation model gives the standard deviation at 0.4-2.1 %, which does not exceed the measurement error.

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Speed of sound and ideal-gas heat capacity of freon R-236ea

Cited by 6 publications

References 4 publications

Estimation of usage efficiency of freon-steam turbines in mine energy complexes

Estimation of usage efficiency of freon-steam turbines in mine energy complexes

Thermodynamic Properties of HFC-236ea

Thermal Conductivity Calculation Model for Refrigerant Mixtures in the Vapor Phase

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