Influence of supercritical ORC parameters on plate heat exchanger design

Karellas, Sotiriοs; Schuster, Andreas; Leontaritis, Aris-Dimitrios

doi:10.1016/j.applthermaleng.2011.09.013

Cited by 117 publications

(66 citation statements)

References 10 publications

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“…This value is far away from the critical pressure of the R134a refrigerant, which is 4.06 MPa. As reported by Karellas et al (2012), when the pressure of the evaporator rises, the error of the finite volume calculation is reduced, and the procedure converges with fewer segments. The R134a k at 4.5 MPa R134a  at 4.5 MPa R134a k at 6 MPa R134a  at 6 MPa prediction errors of the refrigerant enthalpy and the heat source temperature are calculated for the different numbers of segments against the reference 100 segments model and shown in Figure 6.…”

Section: Performance Of Evaporator Modelmentioning

confidence: 87%

“…When an evaporator is subjected to a supercritical pressure, thermo-physical properties of the working fluid are strongly dependent on the temperature (Karellas et al, 2012). Furthermore, a distinct phase for the fluids does not exist at supercritical conditions.…”

Section: Evaporatormentioning

confidence: 99%

“…For this reason, both steady-state and dynamic simulation of the supercritical ORC-WHR system is necessary before testing the real system. The investigation of steady-state modelling of the supercritical ORC-WHR system has been presented in several reports (Chowdhury et al, 2015a andGao et al, 2012;Glover et al, 2015a andKarellas et al, 2012;Schuster et al, 2010 ). However, most of these focused on the fluid selection (Gao et al, 2012;Glover et al, 2015a;Schuster et al, 2010); design, optimization and performance analysis (Schuster et al, 2010;Karellas et al, 2012;Chowdhury et al, 2015a andGlover et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Performance Of Evaporator Modelmentioning

confidence: 87%

Section: Evaporatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…• Heat transfer coefficient: The heat transfer coefficient plays a crucial role in the definition of the size and cost of the heat exchangers [87]. The selection of an organic compound with good heat transfer properties would lead to the reduction of the heat transfer surface, which, in turn, lowers the overall size, weight and cost of the ORC system [88].…”

Section: R 143amentioning

confidence: 99%

Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review

et al. 2017

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Abstract:The Organic Rankine Cycle (ORC) is widely considered as a promising technology to produce electrical power output from low-grade thermal sources. In the last decade, several power plants have been installed worldwide in the MW range. However, despite its market potential, the commercialization of ORC power plants in the kW range did not reach a high level of maturity, for several reasons. Firstly, the specific price is still too high to offer an attractive payback period, and secondly, potential costumers for small-scale ORCs are typically SMEs (Small-Medium Enterprises), generally less aware of the potential savings this technology could lead to. When it comes to small-scale plants, additional design issues arise that still limit the widespread availability of the technology. This review paper presents the state of the art of the technology, from a technical and economic perspective. Working fluid selection and expander design are illustrated in detail, as they represent the bottleneck of the ORC technology for small-scale power production. In addition, a European market analysis is presented, which constitutes a useful instrument to understand the future evolution of the technology.

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“…This method cannot be used where a distinct fluid phase is absent. The finite volume technique splits the evaporator into small segments and heat transfer equations are solved iteratively [2,18,19]. In the FV method, the thermo-physical properties are assumed to be constants at each segment of the evaporator since the temperature variation of the segment is low and is normally neglected.…”

Section: Introductionmentioning

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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Influence of supercritical ORC parameters on plate heat exchanger design

Cited by 117 publications

References 10 publications

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

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

Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review

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

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