Innovations for organic Rankine cycle power systems: Current trends and future perspectives

Wieland, Christoph Martin; Schifflechner, Christopher; Braimakis, Konstantinos; Kaufmann, Florian; Dawo, Fabian; Karellas, Sotiriοs; Besagni, Giorgio; Markides, Christos N.

doi:10.1016/j.applthermaleng.2023.120201

Cited by 26 publications

(3 citation statements)

References 140 publications

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“…Several prior review publications by other researchers [6,21] had looked into WHR installation on-board ships based on ORC with an emphasis on the current trends of this technology and its prospective future. After examining three cycles-ORC, KC, and SRCin an integrated scenario using a large naval two-stroke diesel engine, Ulrik et al [22] concluded that the ORC had the most potential to improve the engine's fuel consumption.…”

Section: Technologymentioning

confidence: 99%

Thermodynamic Analysis and Economic Assessment of Organic Rankine Cycle Integrated with Thermoelectric Generator Onboard Container Ship

Elkafas

2024

Processes

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In July 2023, the International Maritime Organization (IMO) presented an updated strategy for decarbonizing maritime transport and achieving net-zero greenhouse gas emissions by 2050. It is therefore imperative to explore innovative solutions to achieve a blue economy and maximize energy efficiency on-board ships. For this reason, the current study aims to integrate the organic Rankine cycle (ORC) and thermoelectric generator (TEG) on board a container ship to generate electrical energy and reduce fuel consumption. The combined system will benefit from the waste heat of a marine diesel engine installed on board. The current study uses R245fa as the organic liquid and analyzes the effects of varying the evaporation pressure on the energetic and economic performance indicators by modeling the combined system in Engineering Equation Solver (EES) software. The results show that the energy efficiency of the ORC system increases from 12.3% at 3.5 bar to 17.3% at 8 bar. In comparison, the energy efficiency of the TEG unit is 6.9% at different evaporation pressures. In addition, the energy efficiency of the TEG-ORC system is 18.3% with an output of 1386 kW at 8 bar, which is an increase of 30.5% compared to the value at 3.5 bar. This generated power reduces fuel consumption by around 1580 ton/year. From an economic point of view, the energy production cost of the combined system is USD 618/kWh and USD 614/kWh at the lowest and maximum evaporation pressure, respectively. Fuel costs and CO2 tax expenditures could be reduced by up to USD 1.169 million/year and USD 0.47 million/year, respectively, through the combined TEG-ORC system.

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Section: Technologymentioning

confidence: 99%

Thermodynamic Analysis and Economic Assessment of Organic Rankine Cycle Integrated with Thermoelectric Generator Onboard Container Ship

Elkafas

2024

Processes

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“…Various designs have been developed for ORC such as regenerative, multistage, cascaded, and reheating cycles [2,23,24], but in most cases, they assume a constant heat flow rate. This article focuses on design and integration for the utilization of low-and mediumtemperature heat sources which are likely intermittent and fluctuating, for instance, the waste heat and some renewables.…”

Section: Design and Integrated System Of Organic Rankine Cycle For Me...mentioning

confidence: 99%

Design, Integration, and Control of Organic Rankine Cycles with Thermal Energy Storage and Two-Phase Expansion System Utilizing Intermittent and Fluctuating Heat Sources—A Review

et al. 2023

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In order to lessen reliance on fossil fuels, a rise in interest in the utilization of fluctuating and intermittent heat sources derived from renewable energy (such as solar thermal, ocean thermal, and geothermal) and waste heat has been observed. These heat sources could be used to generate electricity at relatively low and medium temperatures, for example, through the organic Rankine cycle (ORC). In some case studies, various approaches have been developed to deal with and design ORCs in the desired operating condition utilizing suitable working fluids. This article aims to review some designs and integrated systems of ORC with thermal energy storage (TES) and a two-phase expansion system focusing on the utilization of medium- and low-temperature heat sources in which some subcritical ORCs are presented. Moreover, several possible control systems (both conventional and advanced ones) of ORC with TES and a two-phase expansion system are reported and compared. At the end of this article, the possible future developments of design and control systems are discussed to describe advanced ORC for utilizing low-grade heat sources. This study aims to provide researchers and engineers with an insight into the challenges involved in this process, making industrialization of ORC technology more extensive, in particular when combined with TES and a two-phase expansion system.

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“…Cleaner production: it is expected that the growing operation of ORCs driven by clean energy sources such as geothermal, solar, and biomass will be maintained, or even those driven by waste heat of an industrial nature or any process where the integration of an ORC has the potential to improve overall energy efficiency. Some other authors [153] consider that reversible ORC heat pump systems also represent an additional field of interest to work in, as a key solution to waste heat recovery, together with thermal and electrical energy storage.…”

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confidence: 99%

A Comprehensive Review of Organic Rankine Cycles

et al. 2023

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It has been demonstrated that energy systems driven by conventional energy sources like fossil fuels are one of the main causes of climate change. Organic Rankine cycles can help to reduce that impact, as they can be operated by using the industrial waste heat of renewable energies. The present study presents a comprehensive bibliographic review of organic Rankine cycles. The study not only actualizes previous reviews that mainly focused on basic cycles operating on subcritical or supercritical conditions, but also includes the analysis of novel cycles such as two-stage and hybrid cycles and the used fluids. Recuperative and regenerative cycles are more efficient than reheated and basic single-stage cycles. The use of two-stage cycles makes it possible to achieve higher thermal efficiencies and net power outputs of up to 20% and 44%, respectively, compared with those obtained with single-stage cycles. Theoretical studies show that hybrid systems, including Brayton and organic Rankine cycles, are the most efficient; however, they require very high temperatures to operate. Most organic Rankine cycle plants produce net power outputs from 1 kW up to several tens of kW, mainly using microturbines and plate heat exchangers.

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Innovations for organic Rankine cycle power systems: Current trends and future perspectives

Cited by 26 publications

References 140 publications

Thermodynamic Analysis and Economic Assessment of Organic Rankine Cycle Integrated with Thermoelectric Generator Onboard Container Ship

Thermodynamic Analysis and Economic Assessment of Organic Rankine Cycle Integrated with Thermoelectric Generator Onboard Container Ship

Design, Integration, and Control of Organic Rankine Cycles with Thermal Energy Storage and Two-Phase Expansion System Utilizing Intermittent and Fluctuating Heat Sources—A Review

A Comprehensive Review of Organic Rankine Cycles

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