Investigation of a two stage Rankine cycle for electric power plants

Liu, Bo; Rivière, Philippe; Coquelet, Christophe; Gicquel, Renaud; David, Franck

doi:10.1016/j.apenergy.2012.05.044

Cited by 62 publications

(21 citation statements)

References 18 publications

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“…Thus to optimize the SCE process, one requires an equation of state that can accurately describes the pressuretempererature-volume (PVT) data and the phase behavior in near critical regions. Another perspective application represents the transcritical Rankine cycle with organic working fluids (ORC) for the conversion of the waste-, solar-or geothermal heat [2]. The performance and efficiency of ORC can be tuned by use of mixtures of fluids [3,4].…”

Section: Introductionmentioning

confidence: 99%

A generalized Kiselev crossover approach applied to Soave–Redlich–Kwong equation of state

Janeček

Paricaud

Dicko

et al. 2015

Fluid Phase Equilibria

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Three different variants of the crossover Soave-Redlich-Kwong equation of state are applied to describe the equilibrium behaviour of 72 common fluids -27 hydrocarbons (including the first 10 n-alkanes), 36 halogenated refrigerants, 5 cryogenics (fluorine, oxygene, nitrogene, argon and carbon monoxide) and 4 other industrially important inorganic fluids (carbon dioxide, sulfur dioxide, nitrous oxide and sulfur hexafluoride). The model contains six compound dependent parameters; two of them (a 0 and b of the classical part) are adjusted to reproduce the critical temperature and the critical pressure. Within the first approach (model A), the remaining four parameters -the softness of dispersion interactions m and three parameters of the crossover part (G i , d 1 and v 1 ) -are optimized to reproduce the coexistence densities and the saturation pressure over the whole vapor-liquid region and also the pressure along the critical-and one supercritical isotherms. In the second model (model B), mutual relation between two of the crossover parameters is employed (v 1 = v 1 (G i )) and distersion softness m is expressed as a qudratic function of acentric factor ω. Using these two constrains, the crossover parameter G i (and also v 1 ) becomes correlated to rectlinear diameter r d or 1 critical compression factor Z c . It is also found, that the crossover parameter d 1 has a minor effect on the equilibrium properties. In the third model (model C), this parameter is omitted and the remaining parameters are estimated from knowledge of critical properties (a 0 and b), acentric factor (m) and rectlinear diameter (G i ). The overall quality of model C -which requires only the knowledge of the critical properties, acentric factor and rectlinear diameter -is worse compared to the two models with fitted parameters. However, it is superior to classical cubic equations of state as for the liquid coexistence densities and superior to equations optimized to reproduce the liquid densities (PCSAFT, CPA) as for the description in the critical region. The model C is applied to describe the equilibrium behaviour of two compounds not included in the parametrization, hexafluoropropene (HFO1216) and hexafluoropropene oxide (HFPO), with acceptable quality.

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Section: Introductionmentioning

confidence: 99%

A generalized Kiselev crossover approach applied to Soave–Redlich–Kwong equation of state

Janeček

Paricaud

Dicko

et al. 2015

Fluid Phase Equilibria

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“…Evaporated and superheated fluid expands at ORC turbine, and the power production is achieved. After condensing at ORC condensing the ORC loop is completed [18]. Here, we consider residential water at 20 C as heat sink for the ORC plant.…”

Section: System Descriptionmentioning

confidence: 99%

Thermodynamic Analysis of a Solar Driven Tri-generation System for Building Applications

Özcan

Dinçer

2014

Progress in Exergy, Energy, and the Environment

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Energy and exergy analyses and sustainability assessment of a conceptual solar driven tri-generation system with thermal energy storage option for power, water heating and air cooling are performed. The present tri-generation system includes parabolic trough solar collectors (PTC), an organic Rankine cycle for power generation (ORC), an absorption chiller for cooling (AC) and a thermal energy storage system (TES). The effects of solar collector dimension variations, system parameters, environmental conditions and system integration on system energy and exergy efficiencies are parametrically studied. The largest irreversibility occurs in solar collectors due to very high exergy input to solar panels and less conversion of exergy to working fluid. Energy and exergy efficiencies of the present system become 77.1 % and 27 % during day time and 37.6 % and 18.7 % during night time, respectively. The proposed system performs better performance at lower ambient temperature and higher solar radiation and PTC concentration ratio.

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“…From the above-mentioned studies, it can be obtained that the two-or multi-stage ORC can indeed improve the system performance. However, it should be pointed out that the cycle configurations in literatures [26][27][28][29][30][31][32][33][34][35][36][37] are all parallel systems in essence, and this kind of configuration could adversely reduce the irreversible loss of the high-stage evaporator for the working fluid side. Moreover, no literature has been found to compare parallel and series two-stage organic Rankine cycles.…”

Section: Introductionmentioning

confidence: 98%

“…The results indicate that the thermal efficiency increases by 3-6% throughout the operating region of the engine. Liu et al [29] proposed a two-stage Rankine cycle consisting of a water steam Rankine cycle and an ORC for power generation. Zhang et al [30] and Shu et al [31][32][33] analyzed a dual-loop organic Rankine cycle (DORC) consisting of high-and low-temperature cycles.…”

Section: Introductionmentioning

confidence: 99%

Two-stage evaporation strategy to improve system performance for organic Rankine cycle

Zhang

et al. 2015

Applied Energy

102

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Investigation of a two stage Rankine cycle for electric power plants

Cited by 62 publications

References 18 publications

A generalized Kiselev crossover approach applied to Soave–Redlich–Kwong equation of state

A generalized Kiselev crossover approach applied to Soave–Redlich–Kwong equation of state

Thermodynamic Analysis of a Solar Driven Tri-generation System for Building Applications

Two-stage evaporation strategy to improve system performance for organic Rankine cycle

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