Performance Characteristics of a Rankine Steam Cycle and Boiler for Engine Waste Heat Recovery

Bae, Sukjung; Heo, Hyung-Seok; Lee, Heonkyun; Lee, Donghyuk; Kim, Tae-Jin; Park, Jeongsang; Kim, Charnjung

doi:10.4271/2011-28-0055

Cited by 10 publications

(5 citation statements)

References 4 publications

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“…Rankine cycle systems show a good potential for the waste heat recovery of light-duty trucks [3][4][5][6][7] as well as passenger vehicles [8][9][10][11][12][13][14]. One of the promising solutions is the steam Rankine system [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 98%

Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application

et al. 2012

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Nowadays, on average, two thirds of the fuel energy consumed by an engine is wasted through the exhaust gases and the cooling liquid. The recovery of this energy would enable a substantial reduction in fuel consumption. One solution is to integrate a heat recovery system based on a steam Rankine cycle. The key component in such a system is the expander, which has a strong impact on the system’s performance. A survey of different expander technologies leads us to select the reciprocating expander as the most promising one for an automotive application. This paper therefore proposes a steady-state semi-empirical model of the expander device developed under the Engineering Equation Solver (EES) environment. The ambient and mechanical losses as well as internal leakage were taken into account by the model. By exploiting the expander manufacturer’s data, all the parameters of the expander model were identified. The model computes the mass flow rate, the power output delivered and the exhaust enthalpy of the steam. The maximum deviation between predictions and measurement data is 4.7%. A performance study of the expander is carried out and shows that the isentropic efficiency is quite high and increases with the expander rotary speed. The mechanical efficiency depends on mechanical losses which are quite high, approximately 90%. The volumetric efficiency was also evaluated

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Section: Introductionmentioning

confidence: 98%

Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application

et al. 2012

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“…A key result is the preference of R1234yf for the LT cycle working fluid due to having the highest net output power (36.77 kW) and exergy efficiency (55.05%) even though R600 and R245fa have the highest thermal efficiencies (nearly identical at just over 20%). sources expands the locus of possible ORC configurations, and a similar configuration is studied by Bae et al [108].) As shown in Figure 6, the system consists of two separate cycles: one high temperature (HT) and one low temperature (LT).…”

mentioning

confidence: 93%

“…Shu et al [107] offer an expansion of the ORC configurations presented by Peris et al [5], introducing a new dual-loop ORC (DORC) to recover waste heat from the exhaust and engine coolant of a six-cylinder turbodiesel. (Generally speaking, the use of multiple heat sources expands the locus of possible ORC configurations, and a similar configuration is studied by Bae et al [108]). As shown in Figure 6, the system consists of two separate cycles: one high temperature (HT) and one low temperature (LT).…”

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confidence: 99%

Review of Organic Rankine Cycles for Internal Combustion Engine Waste Heat Recovery: Latest Decade in Review

Sprouse

2024

Sustainability

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The last decade (2013–2023) was the most prolific period of organic Rankine cycle (ORC) research in history in terms of both publications and citations. This article provides a detailed review of the broad and voluminous collection of recent internal combustion engine (ICE) waste heat recovery (WHR) studies, serving as a necessary follow-on to the author’s 2013 review. Research efforts have targeted diverse applications (e.g., vehicular, stationary, and building-based), and it spans the full gamut of engine sizes and fuels. Furthermore, cycle configurations extend far beyond basic ORC and regenerative ORC, particularly with supercritical, trilateral, and multi-loop ORCs. Significant attention has been garnered by fourth-generation refrigerants like HFOs (hydrofluoroolefins), HFEs (hydrofluoroethers), natural refrigerants, and zeotropic mixtures, as research has migrated away from the popular HFC-245fa (hydrofluorocarbon). Performance-wise, the period was marked by a growing recognition of the diminished performance of physical systems under dynamic source conditions, especially compared to steady-state simulations. Through advancements in system control, especially using improved model predictive controllers, dynamics-based losses have been significantly reduced. Regarding practically minded investigations, research efforts have ameliorated working fluid flammability risks, limited thermal degradation, and pursued cost savings. State-of-the-art system designs and operational targets have emerged through increasingly sophisticated optimization efforts, with some studies leveraging “big data” and artificial intelligence. Major programs like SuperTruck II have further established the ongoing challenges of simultaneously meeting cost, size, and performance goals; however, off-the-shelf organic Rankine cycle systems are available today for engine waste heat recovery, signaling initial market penetration. Continuing forward, next-generation engines can be designed specifically as topping cycles for an organic Rankine (bottoming) cycle, with both power sources integrated into advanced hybrid drivetrains.

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“…the system's component size along with keeping cost and environmental aspects in mind, selecting the right working fluid for the Rankine cycle is an important step in overall performance of the WHR system(Bae et al, 2011). Numerous studies related to engine waste heat recovery have been investigated with comparing the performance of different organic fluid types for Rankine cycle waste heat recovery system implemented on heavy-duty diesel vehicle applications(Arunachalam et al, 2012).The applicability and performance of a working fluid in a Rankine cycle depends highly on the fluid characteristics.…”

mentioning

confidence: 99%

Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management

Pradhan

2015

SAE Technical Paper Series

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Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management Saroj Pradhan Heavy-duty diesel (HDD) engines are the primary propulsion source for most heavy-duty vehicle freight movement and have been equipped with an array of aftertreatment devices to comply with more stringent emissions regulations. In light of concerns about the transportation sector's influence on climate change, legislators are introducing requirements calling for significant reductions in fuel consumption and thereby, greenhouse gas (GHG) emission over the coming decades. Advanced engine concepts and technologies will be needed to boost engine efficiencies. However, increasing the engine's efficiency may result in a reduction in thermal energy of the exhaust gas, thus contributing to lower exhaust temperature, potentially affecting after-treatment activity, and consequently emissions rate of regulated pollutants. iii TABLE OF CONTENTS CHAPTER 1 INTRODUCTION .

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Performance Characteristics of a Rankine Steam Cycle and Boiler for Engine Waste Heat Recovery

Cited by 10 publications

References 4 publications

Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application

Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application

Review of Organic Rankine Cycles for Internal Combustion Engine Waste Heat Recovery: Latest Decade in Review

Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management

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