Performance evaluation of a partially admitted axial turbine using R245fa, R123 and their mixtures as working fluid for small-scale organic Rankine cycle

Sun, Hongchuang; Qin, Jiang; Yan, Peng; Huang, Hongyan; Hung, Tzu-Chen

doi:10.1016/j.enconman.2018.06.048

Cited by 25 publications

(7 citation statements)

References 48 publications

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“…1. Three units are connected in series: a fuel-based heat sink system [6], [29], a turboshaft, and an ORC-based PGU [9], [24]. To improve the combustion efficiency, the fuel is preheated by the electronic system, hydraulic system, and so on [6], [29].…”

Section: Integrated Waste Heat Recovery Module Of Helicoptersmentioning

confidence: 99%

“…The significant benefit of improving engine power conversion efficiency can be achieved by warming up the fuel and inlet air [7]. It has been proved that using the fuel as the heat sink can cool the electronic cabin while warming the fuel with a reasonable weight penalty to large helicopters [8], [9]. For small helicopters, the fuel or inlet air can be pre-warmed by the exhaust heat [2].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the possibility of mounting ORC-based waste heat recovery on helicopters is lifted by studies about small scale ORCs for high temperature waste heat recovery. The main focuses are high power density expanders [19], [20], high expansion ratio turbines [21], [22], bladeless turbines [19], working fluid options [9], [23] and so on. Liu et al [24] used the exhaust gas of the auxiliary power unit (APU) as the heating source of an ORC-based waste heat recovery module to produce 12 kW electricity with an efficiency of 11% for the airborne equipment.…”

Section: Introductionmentioning

confidence: 99%

“…Though using R245ca can lead to a higher efficiency than using R600, the output power and thermal efficiency are still lower than other relatively mature ORC applications. Sun et al [9] investigated R245fa, R123, and their mixtures for small scale ORCs and got the maximum power output when the mass fraction of R245fa is 0.25. Nevertheless, they combined an air-cooling turbine with the ORC to construct a power and cooling system for hypersonic aircraft [25].…”

Section: Introductionmentioning

confidence: 99%

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Energy and Exergy Analysis on a Waste Heat Recovery Module for Helicopters

Wei

Zhao

et al. 2021

IEEE Access

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The exhaust of turboshaft engines contains a big amount of waste heat but does not provide propulsion power to the helicopter. Reusing the heat can increase fuel efficiency and reduce carbon emissions of the engine. This paper implements energy analyses and weight penalty estimations to a waste heat recovery module of the turboshaft engine. The components are a fuel preheating process and a power generation unit based on the organic Rankine cycle. The fuel penalty of the module consists of the fuel consumption of the following: carrying the instruments, overcoming the additional drag, and powering from the engine. Considering the high-temperature situation, working fluid of the module is chosen from benzene, R365mfc, and R245fa. Simulation based on T700 turboshaft engine and a complete flight mission validate the energy efficiency improvement produced by the module. Results show that the module having existing technologies of the expander always cost additional fuel while increasing energy efficiency for the helicopter, but negative fuel penalties can be achieved by increasing the power-to-weight ratio of the module.

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Section: Integrated Waste Heat Recovery Module Of Helicoptersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy and Exergy Analysis on a Waste Heat Recovery Module for Helicopters

Wei

Zhao

et al. 2021

IEEE Access

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“…Hydrofluoroolefins (HFO) working fluids are drawing more and more attention. During the transition period, R123 (HCFC working fluid) [23][24][25][26][27][28][29][30] and R245fa (HFC working fluid) [24][25][26][27][31][32][33][34] are two frequently-used working fluids in ORC. Therefore, the economic analysis of ORC utilizing R123 and R245fa is of great significance.…”

Section: Introductionmentioning

confidence: 99%

Economic Analysis of Organic Rankine Cycle Using R123 and R245fa as Working Fluids and a Demonstration Project Report

et al. 2019

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The organic Rankine cycle (ORC) is a popular technology used in waste heat recovery and low-grade heat utilization, which are two important measures to solve the problems brought by the energy crisis. The economic performance of ORC system is an important factor affecting its application and development. Therefore, the economic analysis of ORC is of great significance. In this study, R123 and R245fa, two frequently-used working fluids during the transition period, were selected for calculating and analyzing the economic performance of an ORC used for recovery of waste heat with a low flow rate and medium-low temperature. Five traditional economic indicators, namely total cost, net earnings, payback period, return on investment, levelized energy cost, and present value of total profit in system service life, which is a relatively new indicator, were used to establish the economic analysis model of ORC. The variation effects of evaporation temperature, condensation temperature of working fluid, flue gas inlet temperature, and mass flow rate of flue gas on the above six economic indicators were analyzed. The results show that the optimal evaporation temperature of R123 is 125 °C, the optimal condensation temperature is 33 °C, and the optimal heat source temperature is 217 °C. For R245fa, the optimal evaporation temperature is 122 °C, the optimal condensation temperature is 27 °C, and the optimal heat source temperature is 177 °C. The economic performance of an ORC demonstration project was reported and used for comparison with the estimation and analysis. It was found that the single screw expander has an excellent economy performance, which greatly reduces the proportion of expander cost in the ORC system.

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Thermodynamic analyses and experimental investigations on the net efficiency of a small‐scale organic Rankine cycle prototype

Lei

et al. 2022

Intl J of Energy Research

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Organic Rankine cycle (ORC) is an effective technical route to achieve power generation from low-grade heat energy. In an ORC system, the working medium pump and cooling system consume much more expander power than the steam Rankine cycle. But the power self-consumptions of ORC system did not receive enough attention in public literatures. In this paper, an ORC prototype with R123 as working medium was constructed. The expander power and the power consumptions by all power-consumer equipment were measured. The net efficiency and net power of the ORC prototype achieved 5.02% and 4.4 kW, respec-

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Performance evaluation of a partially admitted axial turbine using R245fa, R123 and their mixtures as working fluid for small-scale organic Rankine cycle

Cited by 25 publications

References 48 publications

Energy and Exergy Analysis on a Waste Heat Recovery Module for Helicopters

Energy and Exergy Analysis on a Waste Heat Recovery Module for Helicopters

Economic Analysis of Organic Rankine Cycle Using R123 and R245fa as Working Fluids and a Demonstration Project Report

Thermodynamic analyses and experimental investigations on the net efficiency of a small‐scale organic Rankine cycle prototype

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