Investigation of Integrated Organic Rankine Cycles and Wind Turbines for Micro-Scale Applications

Morrone, Pietropaolo; Algieri, Angelo; Castiglione, Teresa; Perrone, Diego; Bova, Sergio

doi:10.1016/j.egypro.2018.08.063

Cited by 15 publications

(7 citation statements)

References 18 publications

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“…On the other hand, the surplus moved from 68% to 178% when P ORC,th passed from 106 to 200 kW th . Consequently, the ORC nominal power has been defined in order to assure that the thermal excess and the boiler integration are equal [28,76]. The selected unit presents a nominal electric power equal to 12.7 kW el while the thermal power was 63.5 kW th .…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, a noticeable potential for combing renewable energy sources (e.g., wind energy, solar and biofuel) exists. In particular, the integration of wind and solar energy appears very interesting, especially in urban areas [20,[27][28][29]. To this purpose, both small and large-scale wind turbines have been installed or are receiving increasing attention for suburban and urban location [30][31][32] owing to their unexploited high potential and their possible role for an efficient transition towards sustainable cities [33,34].…”

Section: Introductionmentioning

confidence: 99%

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Techno-Economic Analysis of Biofuel, Solar and Wind Multi-Source Small-Scale CHP Systems

2020

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The aim of the paper is the techno-economic analysis of innovative integrated combined heat and power (CHP) systems for the exploitation of different renewable sources in the residential sector. To this purpose, a biofuel-driven organic Rankine cycle (ORC) is combined with a wind turbine, a photovoltaic system and an auxiliary boiler. The subsystems work in parallel to satisfy the electric and heat demand of final users: a block of 40 dwellings in a smart community. A 12.6 kWel ORC is selected according to a thermal-driven strategy, while wind and solar subsystems are introduced to increase the global system efficiency and the electric self-consumption. The ORC can be switched-off or operated at partial load when solar and/or wind sources are significant. A multi-variable optimization has been carried out to find the proper size of the wind turbine and photovoltaic subsystems and to define the suitable operating strategy. To this purpose, several production wind turbines (1.0–60.0 kWel) and photovoltaic units (0.3–63.0 kWel) have been considered with the aim of finding the optimal trade-off between the maximum electric self-consumption and the minimum payback period and electric surplus. The multi-objective optimization suggests the integration of 12.6 kWel ORC with 10 kWel wind turbine and 6.3 kWel photovoltaic subsystem. The investigation demonstrates that the proposed multi-source integrated system offers a viable solution for smart-communities and distributed energy production with a significant improvement in the global system efficiency (+7.5%) and self-consumption (+15.0%) compared to the sole ORC apparatus.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Techno-Economic Analysis of Biofuel, Solar and Wind Multi-Source Small-Scale CHP Systems

2020

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“…Other configurations exploit the ORC with high temperature working fluid such as benzenes [24] or Toluene in transcritical conditions [25] and dual-loop configurations [26]. Recent works have focused the attention on the potential of waste heat recovery through small scale ORC system [27], that could represent an available solution also in cogenerative and polygeneration system [28], [29], [30]. Although small-scale ORC is a suitable technology for WHT lightduty engine, it involves some problems that need to be addressed: the increase of fuel consumption of the powertrain due to ORC system weigh (vehicle installations), the not constant temperature of the heat source, the frequently off-design operating conditions, correct components choice, and suitable working fluid choice [13], [31].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a bio-diesel fired engine bottoming with micro-ORC

Falbo

Bova

2022

J. Phys.: Conf. Ser.

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The purpose of this work is to investigate the performance in terms of electric power and electric efficiency of a 11kW bio-diesel internal combustion engine (ICE) coupled with a micro Organic Rankine Cycle (ORC) both in design and off-design conditions. A zero dimensional (0D) thermodynamical engine model has been developed to predict the electric and thermal power with 100% biodiesel fuel (B100). B100 has been selected for the performance analysis of the integrated system due its lower environmental impact. For the ORC system, a subcritical thermodynamic model has been used with various working fluid (R245fa, R1233zd(E), R134a, R1234ze(E) and R1234ze(Z)). A plate heat exchanger (PHEX) has been adopted as evaporator of the organic cycle to directly recover the thermal power of the exhaust gas. Both models have been validated using experimental data from literature. Two different expander configurations, dynamic and volumetric, has been investigated. Model validations show good agreement with the experimental and literature data, respectively. Moreover, the results highlight that the micro-ORC could achieve a maximum electric efficiency of about 7% at full load with R1234ze(Z). Although at part load the dynamic expander show better performance, the volumetric expander has been selected for the system analysis due to its real suitability for small and micro scale ORC. Combined system results show a maximum enhancement of engine efficiency of about 5%, and better results, in terms of good compromise between electric efficiency and operating range width, has been shown for R1233zd(E). Furthermore, the direct coupling of the PHEX with the exhaust gases allows to have heat exchange evaporator areas below 2 m2 for all analysed fluids.

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“…Environmental pollution reduction and the development of renewable, innovative, and efficient technologies are among the main challenges of modern society. 1,2 In this context, integrated energy systems appear an attractive solution to meet the energy requests of various users, [3][4][5] increase efficiency and flexibility, [6][7][8] and reduce emissions. [9][10][11] Among the available technologies, internal combustion engines (ICE), 12,13 and organic Rankine cycles (ORC) 14,15 are in the spotlight of the industry and research community.…”

Section: Introductionmentioning

confidence: 99%

Integration of biodiesel internal combustion engines and transcritical organic Rankine cycles for waste‐heat recovery in small‐scale applications

Falbo

Perrone

Morrone

et al. 2021

Intl J of Energy Research

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The aim of the work is the analysis of a novel integrated energy system for small-scale combined heat and power (CHP) generation. The system consists of a topping biodiesel-fired internal combustion engine (ICE) and a bottoming transcritical organic Rankine cycle (TORC) for waste-heat recovery. Specifically, the engine exhaust gas provides energy to the TORC sub-system, while the energy contribution of the ICE cooling circuit assures low-temperature heat generation. Furthermore, a thermal energy storage (TES) unit for the exploitation of the thermal surplus and an auxiliary boiler are present. A mathematical model is developed to evaluate the main performances at full and partial load in terms of thermal and electric production, efficiency, fuel consumption, and primary energy saving. A preliminary analysis is carried out to find the proper organic working fluid for the TORC sub-system. Afterwards, the biodiesel ICE-TORC combined system is adopted to satisfy thermal and electric requests of a commercial centre. To this purpose, hourly energy balances are evaluated, and a techno-economic analysis is performed on an annual basis. The investigated system guarantees a 16.7% primary energy saving and an 8.4 years payback time.

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Investigation of Integrated Organic Rankine Cycles and Wind Turbines for Micro-Scale Applications

Cited by 15 publications

References 18 publications

Techno-Economic Analysis of Biofuel, Solar and Wind Multi-Source Small-Scale CHP Systems

Techno-Economic Analysis of Biofuel, Solar and Wind Multi-Source Small-Scale CHP Systems

Performance analysis of a bio-diesel fired engine bottoming with micro-ORC

Integration of biodiesel internal combustion engines and transcritical organic Rankine cycles for waste‐heat recovery in small‐scale applications

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