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Evaluation on environment-friendly refrigerants with similar normal boiling points in ejector refrigeration system

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Abstract

Based on the “hypothetical throat area” theory and the “constant-pressure mixing” theory, a thermodynamic model for ejector was set up by introducing the real properties of refrigerants. Refrigerants which have similar normal boiling points with each other may act as replacement to each other in substitute progress. In this paper, eight environment-friendly refrigerants were divided into 4 pairs for study according to their normal boiling point. In each refrigerant pair, the entrainment ratios of ejector, system COP, pump power et al. of refrigerants were compared and analyzed. Lastly, the performances of the transcritical and subcritical ejector refrigeration cycles with propylene were calculated and compared.

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Abbreviations

A :

Area (m2)

COP :

Coefficient of performance

GWP :

Global warming potential

h :

Specific enthalpy (J kg−1)

k :

Ratio of specific heat

m :

Mass flow rate (kg s−1)

NBP :

Normal boiling point

ODP :

Ozone depletion potential

p :

Pressure (Pa)

Q :

Rate of heat transfer (W)

s :

Specific entropy (J kg−1 K−1)

T :

Temperature (K)

v :

Specific volume (m3 kg−1)

W p :

Work rate of the pump (W)

w :

Velocity (m s−1)

c:

Condenser

d:

Diffuser of ejector

e:

Evaporator

ef:

Entrained flow

g:

Generator

gf:

Primary flow

m:

Mixing chamber of ejector

s:

Isentropic process

t:

Throat

1-6:

State points

η :

Efficiency

ρ :

Density (kg m−3)

φ m :

Mixing coefficient

ω:

Entrainment ratio

ϕ g :

Ejector characteristic area ratio

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Acknowledgments

The present study was supported by the project of National Natural Science Foundation of China (No. 51406228) and was supported by the Fundamental Research Funds for the Central Universities (2012QNA55).

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    F. Wang & D. Y. Li

  2. Key Laboratory of Sea Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, 116024, China

    S. Q. Shen

Authors
  1. F. Wang
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  2. S. Q. Shen
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  3. D. Y. Li
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Correspondence to F. Wang.

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Wang, F., Shen, S.Q. & Li, D.Y. Evaluation on environment-friendly refrigerants with similar normal boiling points in ejector refrigeration system. Heat Mass Transfer 51, 965–972 (2015). https://doi.org/10.1007/s00231-014-1468-0

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  • DOI: https://doi.org/10.1007/s00231-014-1468-0

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