Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources

Jiménez-Arreola, Manuel; Pili, Roberto; Wieland, Christoph Martin; Romagnoli, Alessandro

doi:10.1016/j.apenergy.2018.01.085

Cited by 54 publications

(16 citation statements)

References 43 publications

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“…Moreover, two heat exchangers serve as the evaporator and condenser for conventional ORC systems. Thus, heat transfer enhancement is conducive to overall system evaluation, which is greatly relevant to heat input as the denominator for calculating thermal efficiency [41]. Different evaporation and condensation processes have been investigated in terms of heat exchanger type, tube structure, refrigerant, etc.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation

Wang

Jiang

et al. 2019

Energies

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Small-scale organic Rankine cycle (ORC) systems driven by solar energy are compared in this paper, which aims to explore the potential of power generation for domestic utilisation. A solar thermal collector was used as the heat source for a hot water storage tank. Thermal performance was then evaluated in terms of both the conventional ORC and an ORC using thermal driven pump (TDP). It is established that the solar ORC using TDP has a superior performance to the conventional ORC under most working conditions. Results demonstrate that power output of the ORC using TDP ranges from 72 W to 82 W with the increase of evaporating temperature, which shows an improvement of up to 3.3% at a 100 °C evaporating temperature when compared with the power output of the conventional ORC. Energy and exergy efficiencies of the ORC using TDP increase from 11.3% to 12.6% and from 45.8% to 51.3% when the evaporating temperature increases from 75 °C to 100 °C. The efficiency of the ORC using TDP is improved by up to 3.27%. Additionally, the exergy destruction using TDP can be reduced in the evaporator and condenser. The highest exergy efficiency in the evaporator is 96.9%, an improvement of 62% in comparison with that of the conventional ORC, i.e., 59.9%. Thus, the small-scale solar ORC system using TDP is more promising for household application.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation

Wang

Jiang

et al. 2019

Energies

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“…To make the heat transfer analysis symmetrical, the profiles can be analysed and desconstructed in order to extract the different components of fluctuation by using Discrete Fourier Analysis. Both the mass flow rate and temperature profiles can be seen as an irregular function or time series that can be decomposed into a sum of sinusoids of different frequencies [34,35].…”

Section: Governing Equationsmentioning

confidence: 99%

Parametric study on melting process of a shell-and-tube latent thermal energy storage under fluctuating thermal conditions

Huang

et al. 2020

Applied Thermal Engineering

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“…16 Hence, the effect of the geometry on the dynamic response of the system is an important aspect and is the main focus. 41 The air-cooler and intercooler of coolant liquid usually have different cooling capacities, and the efficiency values are 60–75 and 80–95%, respectively. As a result, the optimum circuit length is much bigger for the gas cooler than intercooler.…”

Section: Strategy On Improving System Revenuementioning

confidence: 99%

Strategy on performance improvement of inverse Brayton cycle system for energy recovery in turbocharged diesel engines

Zhu

Lin

Zheng

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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The inverse Brayton cycle is a potential technology for waste heat energy recovery. It consists of three components: one turbine, one heat exchanger, and one compressor. The exhaust gas is further expanded to subatmospheric pressure in the turbine, and then cooled in the heat exchanger, last compressed in the compressor into the atmosphere. The process above is the reverse of the pressurized Brayton cycle. This work has presented the strategy on performance improvement of the inverse Brayton cycle system for energy recovery in turbocharged diesel engines, which has pointed the way to the future development of the inverse Brayton cycle system. In the paper, an experiment was presented to validate the numerical model of a 2.0 l turbocharged diesel engine. Meanwhile, the influence laws of the inverse Brayton cycle system critical parameters, including turbocharger speed and efficiencies, and heat exchanger efficiency, on the system performance improvement for energy recovery are explored at various engine operations. The results have shown that the engine exhaust energy recovery efficiency increases with the engine speed up, and it has a maximum increment of 6.1% at the engine speed of 4000 r/min (the engine rated power point) and the full load. At the moment, the absolute pressure was before final compression is 51.9 kPa. For the inverse Brayton cycle system development in the future, it is essential to choose a more effective heat exchanger. Moreover, variable geometry turbines are very appropriate to achieve a proper matching between the turbocharging system and the inverse Brayton cycle system.

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Analysis and comparison of dynamic behavior of heat exchangers for direct evaporation in ORC waste heat recovery applications from fluctuating sources

Cited by 54 publications

References 43 publications

Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation

Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation

Parametric study on melting process of a shell-and-tube latent thermal energy storage under fluctuating thermal conditions

Strategy on performance improvement of inverse Brayton cycle system for energy recovery in turbocharged diesel engines

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