Pumping work in the organic Rankine cycle

Borsukiewicz-Gozdur, A.

doi:10.1016/j.applthermaleng.2012.10.033

Cited by 62 publications

(35 citation statements)

References 19 publications

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“…However, this happens only in the condition of extremely low pump efficiency or very little heat absorbed by the working fluid in the evaporator. According to Equation (11), the BWR of ORC 1-2-3-4-1 with expansion process of this category is less than 1. This means that only a portion of the expander power is used to offset the pumping work, and net work will be generated by the cycle.…”

Section: The Categories Of the Expansion Processmentioning

confidence: 99%

“…In ORCs, the main factors affecting specific pumping work have been analyzed by Borsukiewicz-Gozdur [11]. The ORC power plant pressure range, working fluid properties, power plant arrangement and the pump efficiency all exert great influences on pumping work.…”

Section: Specific Pumping Workmentioning

confidence: 99%

“…Therefore, the value of v ts in expansion process 1'-1' s and its integral mean value are both greater than v t . According to Equation (11), the bottom cycle is also capable of producing net power. In conclusion:…”

Section: 'S Vtmentioning

confidence: 99%

“…Then the rest of the power is exactly the net work produced by the ORC system. Previous studies [10,11] have found that a lower critical temperature of the working fluids leads to greater pumping work in sub-critical Rankine cycles. In traditional steam power plants, the pumping working is negligible since the critical temperature of the working fluid (water) is high.…”

Section: Introductionmentioning

confidence: 99%

“…In conclusion, few papers have discussed both the expander power and the consumed pumping work. It is worth quoting here the introduction of the back work ratio (BWR) [10,11], which indicates the portion of the expander output power needed for driving the circulation pump. Previous studies have revealed that the BWR grows with increasing evaporating temperature, and it will become significantly high when the evaporating temperature gets close to the critical temperature of the organic fluids adopted [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Characteristics of Expander Power Output Used for Offsetting Pumping Work Consumption in Organic Rankine Cycles

Lei

et al. 2014

Energies

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Abstract:The circulation pump in an organic Rankine cycle (ORC) increases the pressure of the liquid working fluid from low condensing pressure to high evaporating pressure, and the expander utilizes the pressure difference to generate work. A portion of the expander output power is used to offset the consumed pumping work, and the rest of the expander power is exactly the net work produced by the ORC system. Because of the relatively great theoretical pumping work and very low efficiency of the circulation pump reported in previous papers, the characteristics of the expander power used for offsetting the pumping work need serious consideration. In particular, the present work examines those characteristics. It is found that the characteristics of the expander power used for offsetting the pumping work are satisfactory only under the condition that the working fluid absorbs sufficient heat in the evaporator and its specific volume at the evaporator outlet is larger than or equal to a threshold value. OPEN ACCESSEnergies 2014, 7 4958

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Section: The Categories Of the Expansion Processmentioning

confidence: 99%

Section: Specific Pumping Workmentioning

confidence: 99%

Section: 'S Vtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on the Characteristics of Expander Power Output Used for Offsetting Pumping Work Consumption in Organic Rankine Cycles

Lei

et al. 2014

Energies

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Selection of working fluids for solar organic Rankine cycle—A review

Arjunan

Muthu

Radha

et al. 2022

Intl J of Energy Research

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Summary The performance of renewable energy systems can be significantly improved if power is produced from low‐temperature heat sources. The organic Rankine cycle (ORC) is suitable for producing power from low‐temperature heat sources. ORC finds applications alongside solar power, geothermal power, waste heat and biomass. ORC‐enabled systems can contribute significantly to raising the effectiveness of renewable power sources. Solar power, for example, can deliver affordable electricity to remote locations and small industries. By employing ORC, power generation is possible at lower temperatures on cloudy days. Its main difference from the steam Rankine cycle is its working fluid. The ORC makes use of an organic, high molecular mass fluid as the working fluid. Compared to steam Rankine cycles, ORC works at a lower temperature (<250°C) and pressure. The only working fluid in the steam Rankine cycle is water, but the ORC can operate on hundreds of different working fluids. The design and performance of ORC systems are entirely dependent upon the suitable working fluid and, hence identification of the working fluid for ORCs is of utmost importance for diverse applications. Properties of working fluid have a considerable impact on the efficiency of the system. The main objective of this study is to identify the most suitable organic fluids having characteristics necessary for use in solar ORCs. In addition, a detailed review of the various types of heat transfer fluids now available in the market that are often used in ORC systems was conducted. This research assists in selecting the most appropriate organic fluids for various solar ORC applications in terms of operating circumstances.

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Thermodynamic analyses and experimental investigations on the net efficiency of a small‐scale organic Rankine cycle prototype

Lei

et al. 2022

Intl J of Energy Research

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Organic Rankine cycle (ORC) is an effective technical route to achieve power generation from low-grade heat energy. In an ORC system, the working medium pump and cooling system consume much more expander power than the steam Rankine cycle. But the power self-consumptions of ORC system did not receive enough attention in public literatures. In this paper, an ORC prototype with R123 as working medium was constructed. The expander power and the power consumptions by all power-consumer equipment were measured. The net efficiency and net power of the ORC prototype achieved 5.02% and 4.4 kW, respec-

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Pumping work in the organic Rankine cycle

Cited by 62 publications

References 19 publications

Study on the Characteristics of Expander Power Output Used for Offsetting Pumping Work Consumption in Organic Rankine Cycles

Study on the Characteristics of Expander Power Output Used for Offsetting Pumping Work Consumption in Organic Rankine Cycles

Selection of working fluids for solar organic Rankine cycle—A review

Thermodynamic analyses and experimental investigations on the net efficiency of a small‐scale organic Rankine cycle prototype

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