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Performance Analyses of CO2-N2O Cascade System for Cooling

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Energy, Transportation and Global Warming

Part of the book series: Green Energy and Technology ((GREEN))

Abstract

The excess usage of many refrigerants which includes chlorofluorocarbons (CFC) and hydro chlorofluorocarbons (HCFC) in cooling systems causes several environmental issues such as acid rain, stratospheric ozone depletion and global climate change. Therefore, the usage of these refrigerants is restricted. In this context, an increase occurs in the usage of the alternative refrigerants.

In this study, a cascade system for cooling with N2O as the high temperature fluid and CO2 as the low temperature fluid is theoretical analyzed. Thermodynamic analysis of cooling system as evaporator temperature variations and pumps inlet pressure variations are investigated. Also, the effects of operating parameters on system performance are studied and illustrated in tables. The system of performance of cooling (COP) and exergy efficiency values are found to be 1.99 % and 31.11 % respectively, for condenser 30 °C and evaporator temperature of −25 °C. Also the system of total exergy destruction is calculated 26.16 kW.

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Author information

Authors and Affiliations

  1. Department of Energy, Vocational Schools of Technical Sciences, Aksaray University, 68100, Aksaray, Turkey

    Fatih Yılmaz

  2. Department of Energy Systems Engineering, Faculty of Technology, Suleyman Demirel University, 32100, Isparta, Turkey

    Reşat Selbaş & Arif Emre Özgür

  3. Department of Mechanical Engineering, Faculty of Engineering, Aksaray University, 68100, Aksaray, Turkey

    M. Tolga Balta

Authors
  1. Fatih Yılmaz
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  2. Reşat Selbaş
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  3. Arif Emre Özgür
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  4. M. Tolga Balta
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Corresponding author

Correspondence to Fatih Yılmaz .

Editor information

Editors and Affiliations

  1. Chemical Process & Energy Resources Inst, Centre for Research & Technology Hellas, Athens, Greece

    Panagiotis Grammelis

Nomenclature

Nomenclature

COP:

Coefficient of performance

Ex:

Exergy flow rate (kW)

Exdes:

Exergy destruction

h:

Specific enthalpy (kJ/kg)

\( \dot{\mathrm{m}} \) :

Mass flow rate (kg/s)

\( \dot{\mathrm{Q}} \) :

Heat flow rate (kW)

s:

Specific entropy (kJ/kg K)

T:

Temperature (K or °C)

\( \dot{\mathrm{W}} \) :

Work rate or power (kW)

ψ :

Specific exergy (kJ/kg)

η :

Efficiency (dimensionless)

ε :

Exergy (second law) efficiency (dimensionless)

in:

Inlet

out:

Outlet

des:

Destruction

ev:

Evaporator

con:

Condenser

exp:

Expansion valve

comp:

Compressor

hexc:

Heat exchanger

isen:

Isentropic

LTC:

Low temperature cycle

HTC:

High temperature cycle

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Yılmaz, F., Selbaş, R., Özgür, A.E., Balta, M.T. (2016). Performance Analyses of CO2-N2O Cascade System for Cooling. In: Grammelis, P. (eds) Energy, Transportation and Global Warming. Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-30127-3_37

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  • DOI: https://doi.org/10.1007/978-3-319-30127-3_37

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-30126-6

  • Online ISBN: 978-3-319-30127-3

  • eBook Packages: EnergyEnergy (R0)

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