Thermal conductivity of a wide range of alternative refrigerants measured with an improved guarded hot-plate apparatus

Hammerschmidt, U.

doi:10.1007/bf02081288

Cited by 43 publications

(21 citation statements)

References 10 publications

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“…and Assael et al118 di↵er by +0.17% and +0.28%, respectively, while the CC results at room temperature of Tufeu et al121 and Le Neindre et al 122 agree within ± 0.5%. The HW data of Snel et al 116 disagree by less than +0.62% with the theoretical values, whereas the PP results of Hemminger126 and of Hammerschmidt127 show di↵erences of 1.0% to + 0.25% upFIG. 4.…”

mentioning

confidence: 85%

State-of-the-art ab initio potential energy curve for the krypton atom pair and thermophysical properties of dilute krypton gas

Jäger

Hellmann

Bich

et al. 2016

The Journal of Chemical Physics

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A new reference krypton-krypton interatomic potential energy curve was developed by means of quantum-chemical ab initio calculations for 36 interatomic separations. Highly accurate values for the interaction energies at the complete basis set limit were obtained using the coupled-cluster method with single, double, and perturbative triple excitations as well as t-aug-cc-pV5Z and t-aug-cc-pV6Z basis sets including mid-bond functions, with the 6Z basis set being newly constructed for this study. Higher orders of coupled-cluster terms were considered in a successive scheme up to full quadruple excitations. Core-core and core-valence correlation effects were included. Furthermore, relativistic effects were studied not only at a scalar relativistic level using second-order direct perturbation theory, but also utilizing full four-component and Gaunt-effect computations. An analytical pair potential function was fitted to the interaction energies, which is characterized by a depth of 200.88 K with an estimated standard uncertainty of 0.51 K. Thermophysical properties of low-density krypton were calculated for temperatures up to 5000 K. Second and third virial coefficients were obtained from statistical thermodynamics. Viscosity and thermal conductivity as well as the self-diffusion coefficient were computed using the kinetic theory of gases. The theoretical results are compared with experimental data and with results for other pair potential functions from the literature, especially with those calculated from the recently developed ab initio potential of Waldrop et al. [J. Chem. Phys. 142, 204307 (2015)]. Highly accurate experimental viscosity data indicate that both the present ab initio pair potential and the one of Waldrop et al. can be regarded as reference potentials, even though the quantum-chemical methods and basis sets differ. However, the uncertainties of the present potential and of the derived properties are estimated to be considerably lower.

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confidence: 85%

State-of-the-art ab initio potential energy curve for the krypton atom pair and thermophysical properties of dilute krypton gas

Jäger

Hellmann

Bich

et al. 2016

The Journal of Chemical Physics

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“…The liquid-phase data of Ikenberry and Rice (Ikenberry & Rice, 1963) were used to obtain the coefficients in Table 3. Additional gas-phase data from several sources (Hammerschmidt, 1995;Makhrov & Miroshnichenko, 1984;Saxena & Gupta, 1970;Saxena & Tondon, 1971;Vargaftik & Yakush, 1971;Voshinin, Kerzhentsev, Studnikov, & Yakush, 1975;Zaitseva, 1959) are used for comparison purposes only. Parameters for the critical enhancement are presented in Table 4.…”

Section: Kryptonmentioning

confidence: 99%

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Huber¹

2018

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We describe models for the viscosity, thermal conductivity, and surface tension for selected fluids implemented in version 10.0 of the NIST computer program, NIST Standard Reference Database 23, also known as NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP). These fluids do not presently have published reference fluid quality models in the open literature, so we provide preliminary models based on available data as an interim measure to allow calculations of these properties. Comparisons with available experimental data are given.

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“…It is based on the data of Afshar and Saxena [31], Hammerschmidt [34], and Taxis-Reischl [38] as indicated in Fig. 5 in the temperature range 280 to 460 K, but extrapolation down to 240 K seems possible.…”

Section: Dilute-gas Thermal Conductivitymentioning

confidence: 99%

Transport properties of 1,1-difluoroethane (R152a)

et al. 1996

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Thermal conductivity of a wide range of alternative refrigerants measured with an improved guarded hot-plate apparatus

Cited by 43 publications

References 10 publications

State-of-the-art ab initio potential energy curve for the krypton atom pair and thermophysical properties of dilute krypton gas

State-of-the-art ab initio potential energy curve for the krypton atom pair and thermophysical properties of dilute krypton gas

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Transport properties of 1,1-difluoroethane (R152a)

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