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Solar Assisted Organic Rankine Cycle for Power Generation: A Comparative Analysis for Natural Working Fluids

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Energy, Transportation and Global Warming

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

Abstract

In this study, a comparative thermodynamic analysis of a solar assisted organic Rankine cycle (ORC) is carried out for different natural working fluids. The required heat energy demand for ORC is supplied by solar energy by means of parabolic trough solar collectors (PTSCs). For the ORC system, eight different natural working fluids those are suitable for low temperature applications such as R170, R1270, R600, R600a, R717, R744, R218 and R161 are analyzed comparatively. Also the analyses are made for R134a in order to compare the system performances. The calculations are made according to the solar flux distribution in Turkey. For the results, the energy and exergy efficiencies and exergy destruction rates of the ORC system for different working natural fluids are compared in detail. From the results of energy and exergy analyses, the best fluid is found to be R744 with a power generation rate of 4.87 kW with an energy and exergy efficiencies of 8 % and 7.1 % respectively. Also it is found that R218 has the highest exergy destruction rate as 76.98 kW. Additionally, the effects of turbine inlet temperature, turbine inlet pressure and condensation temperature on system performance are parametrically analyzed.

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Author information

Authors and Affiliations

  1. Department of Energy Systems Engineering, Faculty of Technology, Süleyman Demirel University, 32200, Isparta, Turkey

    Önder Kizilkan & Gamze Yildirim

  2. Department of Thermodynamics and Heat Engines, Faculty of Electrical and Mechanical Engineering and Naval Architecture, University of Split, R. Boskovica 32, 21000, Split, Croatia

    Sandro Nižetić

Authors
  1. Önder Kizilkan
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  2. Sandro Nižetić
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  3. Gamze Yildirim
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Corresponding author

Correspondence to Gamze Yildirim .

Editor information

Editors and Affiliations

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

    Panagiotis Grammelis

Nomenclature

Nomenclature

Aa :

Aperture area, m2

Ag :

Glass cover area, m2

Ar :

Receiver area, m2

Cp:

Specific heat, kJ/kg K

D:

Tube diameter, m

e:

Specific exergy, kJ/kg

\( \overset{.}{E}\cdot \) :

Energy, kW

\( \overset{.}{E}x \) :

Exergy, kW

F':

Collector efficiency factor

FR :

Heat removal factor

h:

Specific enthalpy, kJ/kg

hc,c-a :

Convection heat loss coefficient between ambient and the cover, kW/m2K

hr,c-a :

Radiation heat transfer coefficient for the glass cover to the ambient, kW/m2K

hf :

Heat transfer coefficient of fluid inside the tube, kW/m2K

hr,r-c :

Radiation heat transfer coefficient between the receiver tube and the glass cover, kW/m2K

ṁ:

Mass flow rate, kg/s

\( \overset{.}{Q}\cdot \) :

Heat, kW

s:

Specific entropy, kJ/kg K

\( \overset{.}{S}\cdot \) :

Entropy, kW/K

S:

Solar irradiation, kW/m2

T:

Temperature, °C or K

UL :

Overall heat loss coefficient, kW/m2 K

\( \overset{.}{W}\cdot \) :

Work, kW

U0 :

Overall heat transfer coefficient, kW/m2 K

η:

Efficiency

dest:

Destruction

gen:

Generation

i:

Inlet

o:

Outlet

u:

Useful

0:

Dead state

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Kizilkan, Ö., Nižetić, S., Yildirim, G. (2016). Solar Assisted Organic Rankine Cycle for Power Generation: A Comparative Analysis for Natural Working Fluids. 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_15

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  • DOI: https://doi.org/10.1007/978-3-319-30127-3_15

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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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