The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Vincent Grelet - One of the best experts on this subject based on the ideXlab platform.
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transient performance evaluation of waste heat recovery Rankine Cycle based system for heavy duty trucks
Applied Energy, 2016Co-Authors: Vincent Lemort, Vincent Grelet, Thomas Reiche, Madiha Nadri, Pascal DufourAbstract:The study presented in this paper aims to evaluate the transient performance of a waste heat recovery Rankine Cycle based system for a heavy duty truck and compare it to steady state evaluation. Assuming some conditions to hold, simple thermodynamic simulations are carried out for the comparison of several fluids. Then a detailed first principle based model is also presented. Last part is focused on the Rankine Cycle arrangement choice by means of model based evaluation of fuel economy for each concept where the fuels savings are computed using two methodologies. Fluid choice and concept optimization are conducted taking into account integration constraints (heat rejection, packaging, …). This paper shows the importance of the modeling phase when designing Rankine Cycle based heat recovery systems and yields a better understanding when it comes to a vehicle integration of a Rankine Cycle in a truck.
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Transient performance evaluation of waste heat recovery Rankine Cycle based system for heavyduty trucks
Applied Energy, 2016Co-Authors: Vincent Grelet, Vincent Lemort, Thomas Reiche, Madiha Nadri, Pascal DufourAbstract:The study presented in this paper aims to evaluate the transient performance of a waste heat recovery Rankine Cycle based system for a heavy duty truck and compare it to steady state evaluation. Assuming some conditions to hold, simple thermodynamic simulations are carried out for the comparison of several fluids. Then a detailed first principle based model is also presented. Last part is focused on the Rankine Cycle arrangement choice by means of model based evaluation of fuel economy for each concept where the fuels savings are computed using two methodologies. Fluid choice and concept optimization are conducted taking into account integration constraints (heat rejection, packaging . . . ). This paper shows the importance of the modeling phase when designing Rankine Cycle based heat recovery systems and yields a better understanding when it comes to a vehicle integration of a Rankine Cycle in a truck.
Sufianu Aliu - One of the best experts on this subject based on the ideXlab platform.
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THERMODYNAMIC MODELLING OF A SOLAR POWERED ORGANIC Rankine Cycle
International Journal of Engineering, 2019Co-Authors: Eghosa Omo-oghogho, Sufianu AliuAbstract:A considerable amount of thermal energy is available in the form of renewable energy source and this can reduce the consumption of fossil fuels. The solar organic Rankine Cycle is a promising technology which uses energy from the sun as a source of power and this does not affect the environment. However, due to the recent global warming, environmental pollution and energy crises coupled with the instability of oil prices, interest in renewable energy for mitigating these issues is growing once again. The aim of this study is to develop a model for evaluating and predicting the net power output and performance of a solar powered organic Rankine Cycle and to validate the model using experimental data. A thermodynamic analysis was carried out to see how feasible the power plant will operate on the chosen site, simulation were done in a Matlab environment , parametric and sensitivity analysis were also carried out to know the parameters that effect the system the most. A model was developed to predict the net power output and thereby performing a performance analysis. The model was validated using an experimental setup by Braden Lee Twomey, 2015 at University of Queensland Australia . Measured/calculated and predicted net power output of the solar organic Rankine Cycle using R134a are 0.905kW, 0.913kW, 0.919kW and 0.908kW, 0.929kW, 0.920kW respectively. Measured/calculated and predicted net power output of the solar organic Rankine Cycle using R245fa are 0.973kW, 0.976kW, 0.979kW and 1.041kW, 0.940kW, 0.953kW respectively. The organic Rankine Cycle efficiencies and the overall solar organic Rankine Cycle efficiencies using R134a are 0.093, 0.086, 0.077 and 0.000028, 0.000030, 0.000032 respectively. The organic Rankine Cycle efficiencies and the overall solar organic Rankine Cycle efficiencies using R245fa are 0.200, 0.185, 0.167 and 0.000060, 0.000065, 0.000069 respectively. From the above result it can be deduced that the measured and predicted net power output are close with very little percentage error and as such the model is able to perform a performance analysis of the system.
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SENSITIVITY ANALYSIS OF A SOLAR ORGANIC Rankine Cycle
International Journal of Engineering, 2019Co-Authors: Eghosa Omo-oghogho, Sufianu AliuAbstract:The solar organic Rankine Cycle is a promising technology which uses energy from the sun as a source of power and this does not affect the environment. However, due to the recent global warming, environmental pollution and energy crises coupled with the instability of oil prices, interest in renewable energy for mitigating these issues is growing once again. The aim of this study is to carry out a thermodynamic and sensitivity analysis of the system A thermodynamic analysis was carried out to see how feasible the power plant will operate on the chosen site, simulation were done in a Matlab environment , parametric and sensitivity analysis were also carried out to know the parameters that effect the system the most. The organic Rankine Cycle efficiencies and the overall solar organic Rankine Cycle efficiencies using R134a are 0.093, 0.086, 0.077 and 0.000028, 0.000030, 0.000032 respectively. The organic Rankine Cycle efficiencies and the overall solar organic Rankine Cycle efficiencies using R245fa are 0.200, 0.185, 0.167 and 0.000060, 0.000065, 0.000069 respectively.
Pascal Dufour - One of the best experts on this subject based on the ideXlab platform.
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transient performance evaluation of waste heat recovery Rankine Cycle based system for heavy duty trucks
Applied Energy, 2016Co-Authors: Vincent Lemort, Vincent Grelet, Thomas Reiche, Madiha Nadri, Pascal DufourAbstract:The study presented in this paper aims to evaluate the transient performance of a waste heat recovery Rankine Cycle based system for a heavy duty truck and compare it to steady state evaluation. Assuming some conditions to hold, simple thermodynamic simulations are carried out for the comparison of several fluids. Then a detailed first principle based model is also presented. Last part is focused on the Rankine Cycle arrangement choice by means of model based evaluation of fuel economy for each concept where the fuels savings are computed using two methodologies. Fluid choice and concept optimization are conducted taking into account integration constraints (heat rejection, packaging, …). This paper shows the importance of the modeling phase when designing Rankine Cycle based heat recovery systems and yields a better understanding when it comes to a vehicle integration of a Rankine Cycle in a truck.
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Transient performance evaluation of waste heat recovery Rankine Cycle based system for heavyduty trucks
Applied Energy, 2016Co-Authors: Vincent Grelet, Vincent Lemort, Thomas Reiche, Madiha Nadri, Pascal DufourAbstract:The study presented in this paper aims to evaluate the transient performance of a waste heat recovery Rankine Cycle based system for a heavy duty truck and compare it to steady state evaluation. Assuming some conditions to hold, simple thermodynamic simulations are carried out for the comparison of several fluids. Then a detailed first principle based model is also presented. Last part is focused on the Rankine Cycle arrangement choice by means of model based evaluation of fuel economy for each concept where the fuels savings are computed using two methodologies. Fluid choice and concept optimization are conducted taking into account integration constraints (heat rejection, packaging . . . ). This paper shows the importance of the modeling phase when designing Rankine Cycle based heat recovery systems and yields a better understanding when it comes to a vehicle integration of a Rankine Cycle in a truck.
Vincent Lemort - One of the best experts on this subject based on the ideXlab platform.
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transient performance evaluation of waste heat recovery Rankine Cycle based system for heavy duty trucks
Applied Energy, 2016Co-Authors: Vincent Lemort, Vincent Grelet, Thomas Reiche, Madiha Nadri, Pascal DufourAbstract:The study presented in this paper aims to evaluate the transient performance of a waste heat recovery Rankine Cycle based system for a heavy duty truck and compare it to steady state evaluation. Assuming some conditions to hold, simple thermodynamic simulations are carried out for the comparison of several fluids. Then a detailed first principle based model is also presented. Last part is focused on the Rankine Cycle arrangement choice by means of model based evaluation of fuel economy for each concept where the fuels savings are computed using two methodologies. Fluid choice and concept optimization are conducted taking into account integration constraints (heat rejection, packaging, …). This paper shows the importance of the modeling phase when designing Rankine Cycle based heat recovery systems and yields a better understanding when it comes to a vehicle integration of a Rankine Cycle in a truck.
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Transient performance evaluation of waste heat recovery Rankine Cycle based system for heavyduty trucks
Applied Energy, 2016Co-Authors: Vincent Grelet, Vincent Lemort, Thomas Reiche, Madiha Nadri, Pascal DufourAbstract:The study presented in this paper aims to evaluate the transient performance of a waste heat recovery Rankine Cycle based system for a heavy duty truck and compare it to steady state evaluation. Assuming some conditions to hold, simple thermodynamic simulations are carried out for the comparison of several fluids. Then a detailed first principle based model is also presented. Last part is focused on the Rankine Cycle arrangement choice by means of model based evaluation of fuel economy for each concept where the fuels savings are computed using two methodologies. Fluid choice and concept optimization are conducted taking into account integration constraints (heat rejection, packaging . . . ). This paper shows the importance of the modeling phase when designing Rankine Cycle based heat recovery systems and yields a better understanding when it comes to a vehicle integration of a Rankine Cycle in a truck.
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Organic Rankine Cycle Systems: A Techno-Economic Overview
2013Co-Authors: Martijn Van Den Broeck, Sylvain Quoilin, Sébastien Declaye, Vincent LemortAbstract:Abstract The potential of organic Rankine Cycle (ORC) technology for waste heat recovery in industry is discussed. This survey includes a market overview, a discussion of the key differences with steam turbine technology, some main selection issues (components and working fluid) and an outlook on the future of the technology. 1 Introduction The organic Rankine Cycle can play a non-negligible role in obtaining a decrease in the energy in-tensity of industry, mainly by recovering waste heat. The technology uses the same components as a conventional steam power plant (a boiler, a work generating expander or turbine, a condenser and a feed pump). The working fluid however is not water and steam but an organic medium character-ized by a lower boiling temperature, facilitating power generation from lower heat source tempera-tures. The success of the ORC technology can be explained partly by its modular feature: a similar system can be used, with few modifications, in combination with various heat sources. Moreover, unlike conventional power Cycles, the technology allows for local and small-scale power genera-tion. The configuration of the organic Rankine Cycle is simpler (see Figure 1 for a schematic dia-gram) than the steam Rankine Cycle: there is no water-steam drum connected to the boiler, and one single heat exchanger can be used to perform the three evaporation phases: preheating, vaporization and superheating. The variations of the Cycle architecture are also more limited: reheating and tur-bine bleeding are generally not suitable for the ORC Cycle.
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Transient Organic Rankine Cycle Modelling for Waste Heat Recovery on a Truck
2011Co-Authors: Nicolas Espinosa, Vincent Lemort, Ignacio Gil-roman, Damien Didiot, Benoit Lombard, Sylvain QuoilinAbstract:The Organic Rankine Cycle is showing promising results for waste heat recovery on long haul truck applications. This technology could further increase the efficiency of current truck powertrains. In such a context, the dynamic simulation of a Rankine Cycle is found to be very important to study its starting and shutting down phases, control strategies and their limits. Such studies are not always easy to perform on a test bench. This paper deals with the dynamic simulation of a Rankine Cycle done under a one dimension commercial fluid dynamic simulation tool (GT-Power). After a brief summary of the component modelling, the paper focuses on the starting and initialization of the model as well as the strategies applied to make the simulation converge. Tank sizing and temperature limitations are addressed to illustrate the use of the model.
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Rankine Cycle for Waste Heat Recovery on Commercial Trucks: Approach, Constraints and Modelling
Diesel International Conference and Exhibition, 2010Co-Authors: Nieves Espinosa, L Tilman, Vincent Lemort, Sylvain QuoilinAbstract:With increasing oil price and growing interest in cutting green house gases emissions, waste heat recovery techniques appear as a very promising path to enhance engine thermal efficiency. Thermoelectricity and Rankine Cycles are two possible ways to recover thermal energy. The Rankine Cycle shows the highest potential due to its higher Cycle efficiency in comparison with the current state-of-the-art thermoelectric materials intrinsic conversion ratio. This paper will focus on the Rankine Cycle system. The first part of the paper lists and describes the constraints of a heat recovery Rankine Cycle system associated to a long haulage truck: limitation of heat available in the heat source, vehicle heat rejection constraints, safety and environmental issues for the working fluid, and backpressures occurring during the heat recovery process. The second part of the paper presents a 0-D simulation model of a Rankine Cycle system. It is shown how the model can be used to compare the performance achieved with several working fluids. Moreover, basic thermodynamic limitations of the system are underlined. Conclusions are drawn concerning the limitation of using only thermodynamic simulations. The performance of the condenser (and its influence on the overall performance) has been investigated more in details, which is shown in the third part of the paper. This was carried out based on a 1-D simulation model of the condenser. Influence of the condenser size and ram air effect are discussed, and the impact on the Rankine Cycle is assessed.
Li Zhao - One of the best experts on this subject based on the ideXlab platform.
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Overview on artificial intelligence in design of Organic Rankine Cycle
Energy and AI, 2020Co-Authors: Dongpeng Zhao, Li Zhao, Shuai Deng, Wei Wang, Xianhua Nie, Chen MengchaoAbstract:Abstract Converting thermal energy into mechanical work by means of Organic Rankine Cycle is a validated technology to exploit low-grade waste heat. The typical design process of Organic Rankine Cycle system, which commonly involves working fluid selection, Cycle configuration selection, operating parameters optimization, and component selection and sizing, is time-consuming and highly dependent on engineer's experience. Thus, it is difficult to achieve the optimal design in most cases. In recent decades, artificial intelligence has been gradually introduced into the design of energy system to overcome above shortcomings. In order to clarify the research field of artificial intelligence technique in Organic Rankine Cycle design and guide artificial intelligence technique to assist Organic Rankine Cycle design better, this study presents a preliminary literature summary on recent progresses of artificial intelligence technique in organic Rankine Cycle systems design. First, this study analyzes four main procedures which constitute a typical design process of Organic Rankine Cycle systems and finds that design problems encountered during design process can be divided into three categories: decision making, parameter optimization and parameter prediction. In the second section, a detailed literature review on each design procedures using artificial intelligence algorithms is presented. At last, the state of art in this field and the prospects for the future work are provided.
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The influence of composition shift on organic Rankine Cycle ( ORC ) with zeotropic mixtures
Energy Conversion and Management, 2014Co-Authors: Li Zhao, Junjiang BaoAbstract:In the medium-temperature and low-temperature energy utilization, organic Rankine Cycle (ORC) is one of the most technically feasible methods. In order to improve temperature mismatch in the process between constant temperature phase change and varying temperature heat source, organic Rankine Cycle with zeotropic mixtures is put forward. The characteristics of temperature glide for zeotropic mixtures during evaporation and condensing processes lead to better temperature match with varying temperature heat source and heat sink, and therefore result in a lower system’s irreversibility and higher system performance. This paper mainly discusses the influence of composition shift on organic Rankine Cycle with zeotropic mixtures. Evaporator, condenser, expander and feed pump models are respectively developed, and then the circulating composition is calculated, based on which, the system parameters and performance of organic Rankine Cycle with zeotropic mixtures are obtained in the case of composition shift that means that the circulating composition is different from the charge composition. The results show that composition shift significantly influence the performance of organic Rankine Cycle with zeotropic mixtures, which will result in a lower output work of expander, a higher power consumption of pump, a lower net output work and lower thermal efficiency. Meanwhile, it also discusses the local composition shift characteristic in the process of phase change and effects of charge and charge composition on composition shift.
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a review of working fluid and expander selections for organic Rankine Cycle
Renewable & Sustainable Energy Reviews, 2013Co-Authors: Li ZhaoAbstract:How to effectively utilize low and medium temperature energy is one of the solutions to alleviate the energy shortage and environmental pollution problems. In the past twenty years, because of its feasibility and reliability, organic Rankine Cycle has received widespread attentions and researches. In this paper, it reviews the selections of working fluids and expanders for organic Rankine Cycle, including an analysis of the influence of working fluids' category and their thermodynamic and physical properties on the organic Rankine Cycle's performance, a summary of pure and mixed working fluids' screening researches for organic Rankine Cycle, a comparison of pure and mixture working fluids' applications and a discussion of all types of expansion machines' operating characteristics, which would be beneficial to select the optimal working fluid and suitable expansion machine for an effective organic Rankine Cycle system.
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Experimental investigation on the low-temperature solar Rankine Cycle system using R245fa
Energy Conversion and Management, 2011Co-Authors: X.d. Wang, Li Zhao, Jun WangAbstract:Abstract An experimental study is conducted to investigate the performance of a low-temperature solar Rankine Cycle system using working fluid R245fa. The experimental installation consists of a flat plate collector, a throttling valve, a working fluid pump and an air cooled condenser, etc. For the typical weather conditions of October in Tianjin, the experiment results show that the highest heat collecting efficiency of the flat plate collector is about 50%. The measured Rankine Cycle efficiency of the system is lower than the theoretical value, due to superheating, subcooling of the working fluid and heat loss of the experimental prototype. Based on the experimental results, an internal heat exchanger is proposed in the solar Rankine Cycle system using R245fa, which can obviously improve the Rankine Cycle efficiency.