Evaluation on Excess Entropy Scaling Method Predicting Thermal Transport Properties of Liquid HFC/HFO Refrigerants

Wang, Xuehui; Wright, Edward; Gao, Neng; Li, Ying

doi:10.1007/s11630-020-1383-2

Cited by 5 publications

(5 citation statements)

References 69 publications

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“…From our evaluation result outcomes, it is concluded that the viscosities for the liquid HFCs could be well represented with their reduced excess entropy universally without any adjustable coefficients, while the thermal conductivity and diffusion could not be well represented. 28 The correlation of the viscosities of HFCs with the excess entropy calculated using free energy-based molecular models has been also reported in the literature, including the PC-SAFT 29,30 and CPA. 31,32 Adjustable coefficients were used in these studies in order to attain better agreements for each substance.…”

Section: Introductionmentioning

confidence: 89%

“…Inspired by this fascinating relationship, this paper aims to provide a useful engineering-applicable tool for property estimations, rather than exploring the driving mechanism of this quasi-universal behavior of liquids. In our previous work, various transport properties (viscosity, thermal conductivity, and thermal diffusion) of hydrofluorocarbons (HFCs), which are widely used as working fluids in refrigeration and organic Rankine cycle systems, have already been directly correlated to the excess entropy obtained from the fundamental multi-parameter equations of state. From our evaluation result outcomes, it is concluded that the viscosities for the liquid HFCs could be well represented with their reduced excess entropy universally without any adjustable coefficients, while the thermal conductivity and diffusion could not be well represented .…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work, various transport properties (viscosity, thermal conductivity, and thermal diffusion) of hydrofluorocarbons (HFCs), which are widely used as working fluids in refrigeration and organic Rankine cycle systems, have already been directly correlated to the excess entropy obtained from the fundamental multi-parameter equations of state. From our evaluation result outcomes, it is concluded that the viscosities for the liquid HFCs could be well represented with their reduced excess entropy universally without any adjustable coefficients, while the thermal conductivity and diffusion could not be well represented . The correlation of the viscosities of HFCs with the excess entropy calculated using free energy-based molecular models has been also reported in the literature, including the PC-SAFT , and CPA. , Adjustable coefficients were used in these studies in order to attain better agreements for each substance.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simple Direct Relationship between Scaled Viscosity and a Dimensionless Calorimetric Parameter for Saturated Liquids

Wang

Gao

et al. 2022

Ind. Eng. Chem. Res.

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The relationship between the transport property and thermodynamic property was explored in this paper. More specifically, a dimensionless calorimetric parameter (DCP) was employed in order to predict the viscosity of different fluids for the first time. It was found that a strong linear correlation between the macroscopically scaled viscosity and the DCP of different fluids in saturated liquid states takes place. Additionally, the values of linearly correlated slopes K for each fluid were found to be in a narrow range (0.411 ± 0.034). Based on this, a quasi-universal viscosity prediction model was proposed. Fourteen fluids representing different molecular structures were selected, and the reliability of the theoretical framework was verified through comparison with experimental data. The results indicated that the correlation approach was very satisfactory with a maximum average absolute deviation (AAD) of 4.40%. Furthermore, by correlating the slopes with the fluid-specific parameters, a generalized function with no adjusting parameters was finally established. Compared with experimental data, the AADs were all located within 7.23%, except those for R125 and R143a. This work provides a convenient calculation method for the estimation of the transport property (viscosity) of different fluids only from the respective thermodynamic properties.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simple Direct Relationship between Scaled Viscosity and a Dimensionless Calorimetric Parameter for Saturated Liquids

Wang

Gao

et al. 2022

Ind. Eng. Chem. Res.

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“…The RES approach expresses transport properties in terms of thermodynamic properties, which can be obtained directly from an EoS. Various approaches based on RES have been proposed and veri ed for viscosity of the Lennard-Jones uid [11] and hundreds of real uids (e.g., hydrocarbons, [12][13][14] refrigerants, [6, [15][16][17], or other commonly used uids [18,19]), as well as thermal conductivity of some real uids [17,[20][21][22][23][24]. Generalized RES approaches for viscosity of more than 100 pure uids have been developed by Lötgering-Lin et al [19] and Dehlouz et al [25].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Linking viscosity to equations of state using residual entropy scaling theory

Yang

Xiao

Thol

et al. 2022

Preprint

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In our previous work (J. Chem. Eng. Data 2021, 66, 3, 1385–1398), a residual entropy scaling (RES) approach was developed to link viscosity to residual entropy (a thermodynamic property calculated with an equation of state, EoS) using a simple polynomial equation for refrigerants. Here, we present an extension of this approach to a much wider range of fluids: all pure fluids and their mixtures whose reference EoS and experimental viscosity data are available. A total of 84877 experimental points for 124 pure fluids and 351 mixtures are collected from 1846 references. The investigated pure fluids contain a wide variety of fluids from light gases with quantum effects at low temperatures to dense fluids and fluids with strong intermolecular association. More than 68.2% (corresponding to the standard deviation) of the evaluated experimental data agree with the RES model within 3.2% and 8.0% for pure fluids and mixtures, respectively. Compared to the recommended models implemented in the REFPROP 10.0 software (the state-of-the-art for thermophysical property calculation), if the dilute gas viscosity is calculated in the same way, our RES approach yields similar statistical agreement with the experimental data while having a much simpler formulation and fewer parameters. To use our RES model, a software package written in Python is provided in the supporting information.

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“…In their study, Sieres et al [22] compared the thermal performance of low GWP refrigerants R452B and R454B with that of the R410A system, and the results showed that the two refrigerants have a thermal performance comparable to that of R410A. Wang et al [23] established and modified a model to predict the performance of HFC/HFO refrigerants by using the excess entropy scaling (EES) method.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study and Experimental Validation on the Applicable Refrigerant for Space Heating Air Source Heat Pump

et al. 2023

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The air source heat pump (ASHP) is developing rapidly and is widely used for space heating due to its potential for increasing energy efficiency and reducing greenhouse gas emissions. The choice of appropriate low global warming potential (GWP) alternative refrigerants is one of the challenges that ASHP systems face. Alternative refrigerants also affect the energy performance of these systems. Thus, it is essential to evaluate the performance of ASHP using environmentally friendly refrigerants to facilitate reasonable refrigerant selection. A theoretical model for simulating ASHP performance with different refrigerants is developed in this study. Experiments are conducted to validate the theoretical model. The simulation and the experimental results are found to be in good agreement. The ASHP performance indices, such as compression ratio (CR), discharging temperature (DT) and coefficients of performance (COP), are investigated using R22, R417A, R410A, R134a, R152a, R161 and R1234yf as working fluids. The results show that R152a has an average COP of 2.7% higher than R22, and R161 has an average COP of 1.4% higher than R22. R152a and R161 also have a higher CR but a lower DT than R22 under the same design conditions. In addition, R152a and R161 have ozone depletion potentials (ODP) of zero and extremely low GWPs; thus, they can be candidates to replace R22 in ASHP heating systems. This research provides a reference on refrigerant replacements for ASHP heating systems in North China.

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Evaluation on Excess Entropy Scaling Method Predicting Thermal Transport Properties of Liquid HFC/HFO Refrigerants

Cited by 5 publications

References 69 publications

Simple Direct Relationship between Scaled Viscosity and a Dimensionless Calorimetric Parameter for Saturated Liquids

Simple Direct Relationship between Scaled Viscosity and a Dimensionless Calorimetric Parameter for Saturated Liquids

Linking viscosity to equations of state using residual entropy scaling theory

Theoretical Study and Experimental Validation on the Applicable Refrigerant for Space Heating Air Source Heat Pump

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