Analysis and assessment of a new organic Rankine based heat engine system with/without cogeneration

SUMMARY This paper presents experimental investigation of the performance of an organic Rankine cycle (ORC) with scroll expander which utilizes renewable, process and waste heats. An ORC test bench is built with a scroll expander‐generator unit modified from a refrigeration compressor‐electrical drive unit. A detailed experimental investigation within the test bench is performed with the organic working fluid R134a. The results show that scroll expander can effectively be used in low‐power ORC to generate mechanical work or electricity from low‐temperature thermal sources (e.g. 80–200 °C, respectively). The experiments are performed under fixed intake conditions into the expander. The pressure ratio and the load connected to the expander‐generator unit were varied. It is found that an optimum pressure ratio and an optimum angular speed co‐exist. When operating optimally, the expander's isentropic efficiency is the highest. The optimum angular speed is around 171 rad/s which corresponds to a generated voltage of 18.6 V. The optimum pressure ratio is about 4. The isentropic efficiency at optimum operation is found in the range of 0.5 to 0.64, depending on the intake conditions. The volumetric efficiency overpasses 0.9 at optimum operation and degrades significantly if the load is increased over the optimum load. A regenerative ORC equipped with the studied expender‐generator unit that operates under 120 °C heat source and has an air cooled condenser generates 920 W net power with efficiencies of 8.5% energetically and 35% exergetically. Copyright © 2014 John Wiley & Sons, Ltd.

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“…[9] show the existence of such an optimum. Ali Tarique, I. Dincer and C. Zamfirescu and the flow rate are small.…”

Section: Resultsmentioning

confidence: 87%

“…Hogerwaard et al [9] performed study with an expander-generator scroll unit in a Rankine cycle heated with hot air. They obtained an energy efficiency of 5% and an exergy efficiency of 7% for a cycle without regeneration.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of a scroll expander for an organic Rankine cycle

Tarique

Dinçer

Zamfirescu

2014

Int. J. Energy Res.

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“…Scroll machines are considered excellent devices, capable of expanding to two phases. The authors and coworkers developed several prototypes of a scroll expander converted from refrigeration scroll compressors that were successfully tested by expanding two phase flows (Hogerwaard et al, 2013;Oralli et al, 2011;Oralli et al, 2014;Tarique et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Novel Power Generating Systems

Dinçer¹,

Zamfirescu

2014

Advanced Power Generation Systems

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“…Matawala and Prabhakaran (2012) exergoeconomically optimised the performance of a steam power plant associated with a large fertiliser industrial unit. Hogerwaard et al (2013) performed a theoretical and experimental study to analyse the performance of a low-temperature heat-driven heat engine system based on a new organic Rankine cycle in terms of energy and exergy. Hogerwaard et al (2013) performed a theoretical and experimental study to analyse the performance of a low-temperature heat-driven heat engine system based on a new organic Rankine cycle in terms of energy and exergy.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analyses of single and double reheat irreversible Rankine cycle

Gonca

2015

IJEX

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In this paper, energy and exergy analyses based on the thermal efficiency, exergy efficiency, exergetic performance criterion, exergy destruction and net specific work output have been performed for irreversible single reheat Rankine cycle (SRRC) and double reheat Rankine cycle (DRRC). The effects of the reheat pressure, boiler pressure and boiler temperature on the general and optimal performance of the cycle are investigated by taking into account the mechanical, boiler and isentropic efficiencies. The maximum values of the exergy efficiencies and specific net work outputs and their corresponding reheat pressures are obtained for the SRRC and DRRC. It is pointed out that exergy efficiencies and specific net work outputs are considerably affected by the reheat pressure, the boiler pressure and the boiler temperature for both of the cycles.

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Analysis and assessment of a new organic Rankine based heat engine system with/without cogeneration

Cited by 25 publications

References 17 publications

Experimental investigation of a scroll expander for an organic Rankine cycle

Experimental investigation of a scroll expander for an organic Rankine cycle

Novel Power Generating Systems

Energy and exergy analyses of single and double reheat irreversible Rankine cycle

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