Off-design model of an ORC system for waste heat recovery of an internal combustion engine

Neto, Rieder de Oliveira; Sotomonte, César Adolfo Rodriguez; Coronado, Christian Jeremi R.

doi:10.1016/j.applthermaleng.2021.117188

Cited by 29 publications

(5 citation statements)

References 44 publications

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“…Some studies have focused on the implementation of ORC to improve the performance of other systems, like internal combustion engines. Such is the case of Neto et al [35], who proposed using an ORC coupled to a stationary diesel engine to take advantage of the exhaust gases of the latter to produce power. The study focused on parametric and economic analyses for determining the optimal operating point from these perspectives.…”

Section: Single-stage Orcmentioning

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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Section: Single-stage Orcmentioning

confidence: 99%

A Comprehensive Review of Organic Rankine Cycles

et al. 2023

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“…One of the most important technological solutions to exploit low-temperature hot sources is the power unit based on Organic Rankine Cycle (ORC) [1]. These, indeed, allow production of mechanical power recovered from the thermal power of waste heat in internal combustion engines [2][3][4] and the industrial sector [5,6]. Moreover, ORC-based power units can recover low-and medium-grade thermal energy of renewable hot sources like solar [7][8][9], geothermal [10,11] and biomasses after combustion [12].…”

Section: Introductionmentioning

confidence: 99%

Development of Dual Intake Port Technology in ORC-Based Power Unit Driven by Solar-Assisted Reservoir

Fatigati,

Cipollone

2024

Energies

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The ORC-based micro-cogeneration systems exploiting a solar source to generate electricity and domestic hot water (DHW) simultaneously are a promising solution to reduce CO2 emissions in the residential sector. In recent years, a huge amount of attention was focused on the development of a technological solution allowing improved performance of solar ORC-based systems frequently working under off-design conditions due to the intermittence of the solar source availability and to the variability in domestic hot water demand. The optimization efforts are focused on the improvement of component technology and plant architecture. The expander is retained as the key component of such micro-cogeneration units. Generally, volumetric machines are adopted thanks to their better capability to deal with severe off-design conditions. Among the volumetric expanders, scroll machines are one of the best candidates thanks to their reliability and to their flexibility in managing two-phase working fluid. Their good efficiency adds further interest to place them among the best candidate machines to be considered. Nevertheless, similarly to other volumetric expanders, an additional research effort is needed toward efficiency improvement. The fixed built-in volume ratio, in fact, could produce an unsteady under- or over-expansion during vane filling and emptying, mainly when the operating conditions depart from the designed ones. To overcome this phenomenon, a dual intake port (DIP) technology was also introduced for the scroll expander. Such technology allows widening the angular extension of the intake phase, thus adapting the ratio between the intake and exhaust volume (so called built-in volume ratio) to the operating condition. Moreover, DIP technology allows increasing the permeability of the machine, ensuring a resulting higher mass flow rate for a given pressure difference at the expander side. On the other hand, for a given mass flow rate, the expander intake pressure diminishes with a positive benefit on scroll efficiency. DIP benefits were already proven experimentally and theoretically in previous works by the authors for Sliding Rotary Vane Expanders (SVRE). In the present paper, the impact of the DIP technology was assessed in a solar-assisted ORC-based micro-cogeneration system operating with scroll expanders and being characterized by reduced power (hundreds of W). It was found that the DIP Scroll allows elaboration of a 32% higher mass flow rate for a given pressure difference between intake and expander sides for the application at hand. This leads to an average power increase of 10% and to an improvement of up to 5% of the expander mechanical efficiency. Such results are particularly interesting for micro-cogeneration ORC-based units that are solar-assisted. Indeed, the high variability of hot source and DHW demand makes the operation of the DIP expander at a wide range of operating conditions. The experimental activity conducted confirms the suitability of the DIP expander to exploit as much as possible the thermal power available from a hot source even when at variable temperatures during operation.

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“…Most of the waste fuel energy (30%–40%) is squandered in the exhaust, and just 12%–25% of the fuel energy is converted into meaningful work 6 . A rapid expansion in the production of ICE raised serious concern about waste fuel energy 7–9 …”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis of the thermal distillation system using diesel engine waste thermal energy and radial finned tube evaporator

Kumar

Prakash

2022

Heat Trans

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The performance of the waste heat-driven distillation system was investigated. The waste heat energy in the exhaust gas of the 7-hp diesel engine generator was utilized for distillation purposes. The thermal distillation system is comprised of a submerged copper tube evaporator and water-cooled U-tube condenser. Four copper tube evaporators were used, including one plain evaporator and three radial finned evaporators with pitch 30, 60, and 90 mm. The efficiency of the thermal distillation system was determined by varying engine load and evaporator type. The net recovered energy and exergy, overall first and second law efficiency, and distillate yield rate was determined relative to the applied load and evaporator type. The results revealed that the net recovered energy and exergy improved by 6.04%-23.22% and factor 1.07-1.23, respectively, at 75% engine load for radial finned evaporator with a pitch of 30 mm relative to plane tube evaporator. The distillate yield was also improved by 23.75% at the highest applied load 75% and the lowest radial fin pitch compared with the plane tube.

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Off-design model of an ORC system for waste heat recovery of an internal combustion engine

Cited by 29 publications

References 44 publications

A Comprehensive Review of Organic Rankine Cycles

A Comprehensive Review of Organic Rankine Cycles

Development of Dual Intake Port Technology in ORC-Based Power Unit Driven by Solar-Assisted Reservoir

Energy and exergy analysis of the thermal distillation system using diesel engine waste thermal energy and radial finned tube evaporator

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