Effects of Superheating on Thermodynamic Performance of Organic Rankine Cycles
Recently ORC(Organic Rankine Cycle) has attracted
much attention due to its potential in reducing consumption of fossil
fuels and its favorable characteristics to exploit low-grade heat sources.
In this work thermodynamic performance of ORC with superheating of
vapor is comparatively assessed for various working fluids. Special
attention is paid to the effects of system parameters such as the evaporating
temperature and the turbine inlet temperature on the characteristics
of the system such as maximum possible work extraction from
the given source, volumetric flow rate per 1 kW of net work and
quality of the working fluid at turbine exit as well as thermal and
exergy efficiencies. Results show that for a given source the thermal
efficiency increases with decrease of the superheating but exergy
efficiency may have a maximum value with respect to the superheating
of the working fluid. Results also show that in selection of working
fluid it is required to consider various criteria of performance characteristics
as well as thermal efficiency.
[1] Y.C. Choi, T.J. Park, J.C. Hong, S.Y. Cho, A study on the characteristics
of waste heat from the industrial complexes for residential and commercial
sectors, Energy Eng. J. 8(1999) 242-247(Korean).
[2] N.A. Lai, M. Wendland, J. Fisher, Working fluids for high temperature
organic Rankine cycle, Energy 36(2011) 199-211.
[3] T.C. Hung, T.Y. Shai, S.K. Wang, A review of organic Rankine cycles
(ORCs) for the recovery of low-grade waste heat, Energy 22(1997)
661-667.
[4] U. Drescher, D. Brueggemann, Fluid selection for the organic Rankine
cycle (ORC) in biomass power and heat plants, Applied Thermal Eng.
27(2007) 223-228.
[5] Y. Dai, J. Wang, L. Gao, Parametric optimization and comparative study
of organic Rankine cycle (ORC) for low grade waste heat recovery, Energy
Convs. Mgmt. 50(2009) 576-582.
[6] T.C. Hung, S.K. Wang, C.H. Kuo, B.S. Pei, K.F. Tsai, A study of organic
working fluids on system efficiency of an ORC using low-grade energy
sources, Energy 35(2010) 1403-1411.
[7] F. Heberle, D. Brueggemann, Exergy based fluid selection for a geothermal
organic Rankine cycle for combined heat and power generation,
Applied Thermal Eng. 30(2010) 1326-1332.
[8] Tchanche B.F, Papadakis G, Frangoudakis A : "Fluid selection for a lowtemperature
solar organic Rankine cycle," Applied Thermal Eng., Vol.
29, 2009, pp. 2468-2476.
[9] T. Yang, G.J. Chen, T.M. Guo, Extension of the Wong- Sandler mixing
rule to the three-parameter Patel-Teja equation of state: Application up to
the near-critical region, Chem. Eng. J. 67(1997) 27-36.
[10] J. Gao, L.D. Li, Z.Y. Zhu, S.G. Ru S.G, Vapor-liquid equilibria calculation
for asymmetric systems using Patel-Teja equation of state with a new
mixing rule, Fluid Phase Equilibria 224(2004) 213- 219.
[11] C.L. Yaws, Chemical properties handbook, McGraw- Hill (1999).
[1] Y.C. Choi, T.J. Park, J.C. Hong, S.Y. Cho, A study on the characteristics
of waste heat from the industrial complexes for residential and commercial
sectors, Energy Eng. J. 8(1999) 242-247(Korean).
[2] N.A. Lai, M. Wendland, J. Fisher, Working fluids for high temperature
organic Rankine cycle, Energy 36(2011) 199-211.
[3] T.C. Hung, T.Y. Shai, S.K. Wang, A review of organic Rankine cycles
(ORCs) for the recovery of low-grade waste heat, Energy 22(1997)
661-667.
[4] U. Drescher, D. Brueggemann, Fluid selection for the organic Rankine
cycle (ORC) in biomass power and heat plants, Applied Thermal Eng.
27(2007) 223-228.
[5] Y. Dai, J. Wang, L. Gao, Parametric optimization and comparative study
of organic Rankine cycle (ORC) for low grade waste heat recovery, Energy
Convs. Mgmt. 50(2009) 576-582.
[6] T.C. Hung, S.K. Wang, C.H. Kuo, B.S. Pei, K.F. Tsai, A study of organic
working fluids on system efficiency of an ORC using low-grade energy
sources, Energy 35(2010) 1403-1411.
[7] F. Heberle, D. Brueggemann, Exergy based fluid selection for a geothermal
organic Rankine cycle for combined heat and power generation,
Applied Thermal Eng. 30(2010) 1326-1332.
[8] Tchanche B.F, Papadakis G, Frangoudakis A : "Fluid selection for a lowtemperature
solar organic Rankine cycle," Applied Thermal Eng., Vol.
29, 2009, pp. 2468-2476.
[9] T. Yang, G.J. Chen, T.M. Guo, Extension of the Wong- Sandler mixing
rule to the three-parameter Patel-Teja equation of state: Application up to
the near-critical region, Chem. Eng. J. 67(1997) 27-36.
[10] J. Gao, L.D. Li, Z.Y. Zhu, S.G. Ru S.G, Vapor-liquid equilibria calculation
for asymmetric systems using Patel-Teja equation of state with a new
mixing rule, Fluid Phase Equilibria 224(2004) 213- 219.
[11] C.L. Yaws, Chemical properties handbook, McGraw- Hill (1999).
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:63749", author = "Kyoung Hoon Kim", title = "Effects of Superheating on Thermodynamic Performance of Organic Rankine Cycles", abstract = "Recently ORC(Organic Rankine Cycle) has attracted
much attention due to its potential in reducing consumption of fossil
fuels and its favorable characteristics to exploit low-grade heat sources.
In this work thermodynamic performance of ORC with superheating of
vapor is comparatively assessed for various working fluids. Special
attention is paid to the effects of system parameters such as the evaporating
temperature and the turbine inlet temperature on the characteristics
of the system such as maximum possible work extraction from
the given source, volumetric flow rate per 1 kW of net work and
quality of the working fluid at turbine exit as well as thermal and
exergy efficiencies. Results show that for a given source the thermal
efficiency increases with decrease of the superheating but exergy
efficiency may have a maximum value with respect to the superheating
of the working fluid. Results also show that in selection of working
fluid it is required to consider various criteria of performance characteristics
as well as thermal efficiency.", keywords = "organic Rankine cycle (ORC), low-grade energysource, Patel-Teja equation, thermodynamic performance", volume = "5", number = "6", pages = "520-4", }