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Numerical investigation on thermodynamic performance of CO2-based mixed refrigerants applied in transcritical system

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Abstract

The CO2-based mixed refrigerants R744/R152a and R744/R161 are proposed to enhance the thermodynamic performance of pure CO2 refrigerant. The basic physical properties of the three refrigerants were analyzed, and the thermodynamic performance of refrigerants with different CO2 ratios are compared. The results present that the optimized ratios of the new refrigerants are R744/R152a: 0.875/0.125, R744/R161: 0.850/0.150, based on which the coefficient of performance (COP), heating and cooling capacity of the optimized refrigerants increase significantly, which are up to 90% of R134a, and the exhaust pressure reduces by 1.6–1.8 MPa compared with that of pure CO2.

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Abbreviations

c p :

Specific heat capacity at constant pressure (J kg−1 K−1)

h :

Enthalpy (J kg−1)

M :

Relative molecular mass (g mol−1)

p :

Pressure (MPa)

p 1 :

Suction pressure of compressor (MPa)

p 2 :

Compressor discharge pressure (MPa)

p 2_opt :

Optimum exhaust pressure (MPa)

p crit :

Critical pressure (MPa)

T crit :

Critical temperature (°C)

p 4 :

Evaporation pressure (MPa)

T 1 :

Compressor suction temperature (°C)

T 2 :

Compressor exhaust temperature (°C)

T 3 :

Air cooler outlet temperature (°C)

T eva :

Evaporation temperature (°C)

R:

General gas constant

v :

Molar volume (L mol−1)

Q l :

Latent heat of vaporization (kJ kg−1)

T s :

Temperature slip (°C)

q c :

Cooling capacity per unit mass (kJ kg−1)

q h :

Heat generation per unit mass (kJ kg−1)

w comp :

Compressor specific power (kJ kg−1)

γ :

Compression ratio

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Authors and Affiliations

  1. School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, China

    Jintao Xie, Yiming Lyu, Dingbiao Wang, Xu Peng, Huadong Liu & Sa Xiang

  2. Engineering Research Center of Energy Saving Technology and Equipment of Thermal Energy System, Ministry of Education, Zhengzhou, China

    Jintao Xie, Yiming Lyu, Dingbiao Wang, Huadong Liu & Sa Xiang

  3. School of Chemical Engineering, Zhengzhou University, Zhengzhou, China

    Xu Peng

  4. Zhengzhou Branch of China Nuclear Power Engineering Co., Ltd, Zhengzhou, China

    Jian Wang

Authors
  1. Jintao Xie
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  2. Jian Wang
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  3. Yiming Lyu
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  4. Dingbiao Wang
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  5. Xu Peng
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  6. Huadong Liu
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  7. Sa Xiang
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Contributions

“Conceptualization was done by Jintao Xie; methodology was done by Jintao Xie; software was done by Xu Peng; validation was done by Jintao Xie; formal analysis was done by Jintao Xie; investigation was carried out by Jintao Xie; resources were carried out by Dingbiao Wang; data curation was done by Jian Wang and Huadong Liu; writing—original draft preparation was done by Jintao Xie; writing—review and editing was done by Jian Wang and Sa Xiang; visualization was done by Jintao Xie; supervision was done by Jintao Xie; project administration was done by Yiming Lyu. All authors have read and agreed to the published version of the manuscript.”

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Correspondence to Dingbiao Wang or Xu Peng.

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We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work. There is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled, “Numerical investigation on thermodynamic performance of CO2-based mixed refrigerants applied in transcritical system.”

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Xie, J., Wang, J., Lyu, Y. et al. Numerical investigation on thermodynamic performance of CO2-based mixed refrigerants applied in transcritical system. J Therm Anal Calorim 147, 6883–6892 (2022). https://doi.org/10.1007/s10973-021-11011-x

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  • DOI: https://doi.org/10.1007/s10973-021-11011-x

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