Numerical analysis of an organic Rankine cycle under steady and variable heat input

Bamgbopa, Musbaudeen O.; Uzgoren, Eray

doi:10.1016/j.apenergy.2013.02.040

Cited by 45 publications

(24 citation statements)

References 18 publications

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“…In a subsequent article by Bamgbopa and Uzgoren [94] the models were utilized to evaluate the steady state efficiency of a solar ORC system. The values for the decision variables (hot source flow rate and temperature, and working fluid flow rate) that maximize the overall efficiency of the system were determined.…”

Section: Dynamic Modelsmentioning

confidence: 99%

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

2015

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Efficient power generation from low to medium grade heat is an important challenge to be addressed to ensure a sustainable energy future. Organic Rankine Cycles (ORCs) constitute an important enabling technology and their research and development has emerged as a very active research field over the past decade. Particular focus areas include working fluid selection and cycle design to achieve efficient heat to power conversions for diverse hot fluid streams associated with geothermal, solar or waste heat sources. Recently, a number of approaches have been developed that address the systematic selection of efficient working fluids as well as the design, integration and control of ORCs. This paper presents a review of emerging approaches with a particular emphasis on computer-aided design methods.

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Section: Dynamic Modelsmentioning

confidence: 99%

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

2015

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“…An externally finned tube type heat exchanger is mostly used for the heat recovery from a gas with the liquid on the inside of the tube [16,24,25]. A shell and tube and plate-type heat exchangers are commonly used for liquid to liquid heat recovery applications [2,24,26].…”

Section: Evaporator In Waste Heat Recovery (Whr) Systemmentioning

confidence: 99%

Modelling of Evaporator in Waste Heat Recovery System using Finite Volume Method and Fuzzy Technique

2015

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Abstract:The evaporator is an important component in the Organic Rankine Cycle (ORC)-based Waste Heat Recovery (WHR) system since the effective heat transfer of this device reflects on the efficiency of the system. When the WHR system operates under supercritical conditions, the heat transfer mechanism in the evaporator is unpredictable due to the change of thermo-physical properties of the fluid with temperature. Although the conventional finite volume model can successfully capture those changes in the evaporator of the WHR process, the computation time for this method is high. To reduce the computation time, this paper develops a new fuzzy based evaporator model and compares its performance with the finite volume method. The results show that the fuzzy technique can be applied to predict the output of the supercritical evaporator in the waste heat recovery system and can significantly reduce the required computation time. The proposed model, therefore, has the potential to be used in real time control applications.

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“…In this research, a zero-dimensional thermodynamic model of a turbine is used for the simulation of the expander. The thermodynamic model of the expander is developed based on the steady state condition since the response time of the turbomachinery compared to the evaporator is very small and can normally be neglected (Quoilin et al, 2011;Bamgbopa and Uzgoren, 2013).…”

Section: Expandermentioning

confidence: 99%

“…The working fluids used in the ORC are organic substances (i.e., hydrocarbons or refrigerants) instead of water which is normal in the traditional Rankine cycle. Compared to water, the thermo-physical properties of the organic fluid are more suitable to use in a WHR system with a low to medium grade heat source and can generate a power output from a few kW to 200 kW (Bamgbopa and Uzgoren, 2013;Zhang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Dynamic model of supercritical Organic Rankine Cycle waste heat recovery system for internal combustion engine

Chowdhury

Nguyen

Thornhill

2017

Int.J Automot. Technol.

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ABSTRACTThe supercritical Organic Rankine Cycle (ORC) for the Waste Heat Recovery (WHR) from Internal Combustion (IC) engines has been a growing research area in recent years, driven by the aim to enhance the thermal efficiency of the ORC and engine. Simulation of a supercritical ORC-WHR system before a real-time application is important as high pressure in the system may lead to concerns about safety and availability of components. In the ORC-WHR system, the evaporator is the main contributor to thermal inertia of the system and is considered to be the critical component since the heat transfer of this device influences the efficiency of the system. Since the thermophysical properties of the fluid at supercritical pressures are dependent on temperature, it is necessary to consider the variations in properties of the working fluid. The well-known Finite Volume (FV) discretization method is generally used to take those property changes into account. However, a FV model of the evaporator in steady state condition cannot be used to predict the thermal inertia of the cycle when it is subjected to transient heat sources. In this paper, a dynamic FV model of the evaporator has been developed and integrated with other components in the ORC-WHR system. The stability and transient responses along with the performance of the ORC-WHR system for the transient heat source are investigated and are also included in this paper.

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Numerical analysis of an organic Rankine cycle under steady and variable heat input

Cited by 45 publications

References 18 publications

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

Modelling of Evaporator in Waste Heat Recovery System using Finite Volume Method and Fuzzy Technique

Dynamic model of supercritical Organic Rankine Cycle waste heat recovery system for internal combustion engine

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