The thermodynamic analysis of multicycle ORC engine

Gnutek, Z.; Bryszewska-Mazurek, A.

doi:10.1016/s0360-5442(01)00070-6

Cited by 54 publications

(16 citation statements)

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“…Some of the proposed cycles are: the triangular cycle (TLC) [5][6][7], cycles with zeotropic mixtures (ZM) as working fluids [8][9][10], cycles with multiple evaporation pressures [11,12] and the transcritical ORC (TCORC). The thermodynamic performance benefits of the TCORC were early on investigated by among others Angelino and Colonna [13], Saleh et al [14] and Schuster et al [15].…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Thermo-Economic Optimization Strategy for ORCs Applied to Subcritical and Transcritical Cycles for Waste Heat Recovery

et al. 2015

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Organic Rankine cycles (ORCs) are an established technology to convert waste heat to electricity. Although several commercial implementations exist, there is still considerable potential for thermo-economic optimization. As such, a novel framework for designing optimized ORC systems is proposed based on a multi-objective optimization scheme in combination with financial appraisal in a post-processing step. The suggested methodology provides the flexibility to quickly assess several economic scenarios and this without the need of knowing the complex design procedure. This novel way of optimizing and interpreting results is applied to a waste heat recovery case. Both the transcritical ORC and subcritical ORC are investigated and compared using the suggested optimization strategy.

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Section: Introductionmentioning

confidence: 99%

Multi-Objective Thermo-Economic Optimization Strategy for ORCs Applied to Subcritical and Transcritical Cycles for Waste Heat Recovery

et al. 2015

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“…Some authors focused on the cycle design, such as Larjola [6] who studied the use of an integrated high speed, oil-free turbogenerator-feed pump for a 100 kWe WHR ORC. Advanced cycle configurations have also been studied: Gnutek et al [7] proposed an ORC cycle with multiple pressure levels and sliding vane expansion machines using R123 in order to maximize the use of the heat source; Chen et al…”

Section: Introductionmentioning

confidence: 99%

Thermo-economic optimization of waste heat recovery Organic Rankine Cycles

Quoilin¹,

Declaye²,

Tchanche³

et al. 2011

Applied Thermal Engineering

596

202

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The present paper focuses both on the thermodynamic and on the economic optimization of a small scale ORC in waste heat recovery application. A sizing model of the ORC is proposed, capable of predicting the cycle performance with different working fluids and different components sizes. The working fluids considered are R245fa, R123, n-butane, n-pentane and R1234yf and Solkatherm. Results indicate that, for the same fluid, the objective functions(economics profitability, thermodynamic efficiency) lead to different optimal working conditions in terms of evaporating temperature: the operating point for maximum power doesn't correspond to that of the minimum specific investment cost: The economical optimum is obtained for nbutane with a specific cost of 2136 €/kW, a net output power of 4.2 kW, and an overall efficiency of 4.47%, while the thermodynamic optimum is obtained for the same fluid with an overall efficiency of 5.22%. It is also noted that the two optimizations can even lead to the selection of a different working fluid. This is mainly due to additional fluid properties that are not taken into account in the thermodynamic optimization, such as the fluid density: a lower density leads to the selection of bigger components which increases the cost and decreases the economical profitability.

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“…Kanoglu [1] discussed a dual-level binary geothermal power plant, Gu and Sato [8] studied the supercritical cycles, while DiPippo [9] proposed a recovery heat exchanger (RHE) with a cascade of evaporators, and high/low pressure turbines operating in a Kalina cycle. Desai and Bandyopadhyay [10] recommended incorporating both regeneration and turbine bleeding to the basic organic Rankine cycles, whereas Gnutek and Bryszewska-Mazurek [11] suggested multicycle with different thermodynamic properties.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis and performance optimization of organic rankine cycles for the conversion of low-to-moderate grade geothermal heat

Yekoladio

Bello‐Ochende

Meyer

2015

Int. J. Energy Res.

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The present study considers a thermodynamic analysis and performance optimization of geothermal power cycles. The proposed binary-cycles operate with moderately low temperature and liquid-dominated geothermal resources in the range of 110 o C to 160 o C, and cooling air at ambient conditions of 25 o C and 101.3 kPa reference temperature and atmospheric pressure, respectively. A thermodynamic optimization process and irreversibility analysis were performed to maximize the power output while minimizing the overall exergy destruction and improving the First-and Second-law efficiencies of the cycle. Maximum net power output was observed to increase exponentially with the geothermal resource temperature to yield 16-49 kW per unit mass flow rate of the geothermal fluid for the nonregenerative ORCs, as compared to 8-34 kW for the regenerative cycles. The cycle First-law efficiency was determined in the range of 8-15% for the investigated geothermal binary power cycles. Maximum Second-law efficiency of approximately 56% was achieved by the ORC with an IHE. In addition, a performance analysis of selected pure organic fluids such as R123, R152a, isobutane and n-pentane, with boiling points in the range of -24 o C to 36 o C, was conducted under saturation temperature and subcritical pressure operating conditions of the turbine. Organic fluids with higher boiling point temperature, such as n-pentane, were recommended for non-regenerative cycles. The regenerative ORCs, however, require organic fluids with lower vapour specific heat capacity (i.e. isobutane) for an optimal operation of the binary-cycle.

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The thermodynamic analysis of multicycle ORC engine

Cited by 54 publications

References 0 publications

Multi-Objective Thermo-Economic Optimization Strategy for ORCs Applied to Subcritical and Transcritical Cycles for Waste Heat Recovery

Multi-Objective Thermo-Economic Optimization Strategy for ORCs Applied to Subcritical and Transcritical Cycles for Waste Heat Recovery

Thermo-economic optimization of waste heat recovery Organic Rankine Cycles

Thermodynamic analysis and performance optimization of organic rankine cycles for the conversion of low-to-moderate grade geothermal heat

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