Exergy-based thermodynamic analysis of solar driven Organic Rankine Cycle

Kerme, Esa Dube; Orfi, Jamel

doi:10.18186/jte.25809

Cited by 26 publications

(17 citation statements)

References 27 publications

(25 reference statements)

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“…To define a cost function that depends on interest optimization parameters, the cost of components must be expressed in terms of thermodynamic design parameters. The cost balance equations applied to component c of the system under study show that the sum of rates associated with all outgoing exergy flows equals the sum of cost rates of all incoming exergy flows, plus those corresponding to charges due to capital investment and operating and maintenance costs, as shown in Equation (19) [12]:…”

Section: Conventional Exergo-economic Analysismentioning

confidence: 99%

“…In addition, studies from the exergetic point of view have been developed in a traditional way, and thermal-economical studies for waste heat recovery systems of gas generation engines through ORC have not been widely integrated. Thus, the literature reports the results of the modeling developed by Kerme and Orfi [12], who studied the effect of the temperature of the organic fluid at the entrance of an ORC turbine on the energy and exergy performance, obtaining that the increase of the temperature increases the efficiency while total exergy destruction decreases it.…”

Section: Introductionmentioning

confidence: 99%

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Advance Exergo-Economic Analysis of a Waste Heat Recovery System Using ORC for a Bottoming Natural Gas Engine

2020

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This manuscript presents an advanced exergo-economic analysis of a waste heat recovery system based on the organic Rankine cycle from the exhaust gases of an internal combustion engine. Different operating conditions were established in order to find the exergy destroyed values in the components and the desegregation of them, as well as the rate of fuel exergy, product exergy, and loss exergy. The component with the highest exergy destroyed values was heat exchanger 1, which is a shell and tube equipment with the highest mean temperature difference in the thermal cycle. However, the values of the fuel cost rate (47.85 USD/GJ) and the product cost rate (197.65 USD/GJ) revealed the organic fluid pump (pump 2) as the device with the main thermo-economic opportunity of improvement, with an exergo-economic factor greater than 91%. In addition, the component with the highest investment costs was the heat exchanger 1 with a value of 2.769 USD/h, which means advanced exergo-economic analysis is a powerful method to identify the correct allocation of the irreversibility and highest cost, and the real potential for improvement is not linked to the interaction between components but to the same component being studied.

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Section: Conventional Exergo-economic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advance Exergo-Economic Analysis of a Waste Heat Recovery System Using ORC for a Bottoming Natural Gas Engine

2020

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“…Additionally, several researches focusing on the second law of thermodynamics have been developed, without thermo-economic analysis such as the modeling developed by Kerme and Orfi [21], who evaluate the effect of the input temperature of an ORC turbine on the main parameters of energy and exergetic efficiency driven by solar collectors. As a result, was obtained that the net electrical efficiency is directly related to the increase in the input temperature of the system, contrary to the total exergy destruction rate, which is inversely proportional to the input temperature in the system.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

Valencia¹,

Fontalvo²,

Cardenas³

et al. 2019

Preprint

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One way to increase overall natural gas engine efficiency is to transform exhaust waste heat into useful energy by means of a bottoming cycle. Organic Rankine cycle (ORC) is a promising technology to convert medium and low grade waste heat into mechanical power and electricity. This paper presents an energy and exergy analysis of three ORC-Waste heat recovery configurations by using an intermediate thermal oil circuit: Simple ORC (SORC), ORC with Recuperator (RORC) and ORC with Double Pressure (DORC), and Cyclohexane, Toluene and Acetone have been proposed as working fluids. An energy and exergy thermodynamic model is proposed to evaluate each configuration performance, while available exhaust thermal energy variation under different engine loads was determined through an experimentally validated mathematical model. Additionally, the effect of evaportating pressure on net power output , absolute thermal efficiency increase, absolute specific fuel consumption decrease, overall energy conversion efficiency, and component exergy destruction is also investigated. Results evidence an improvement in operational performance for heat recovery through RORC with Toluene at an evaporation pressure of 3.4 MPa, achieving 146.25 kW of net power output, 11.58% of overall conversion efficiency, 28.4% of ORC thermal efficiency, and an specific fuel consumption reduction of 7.67% at a 1482 rpm engine speed, a 120.2 L/min natural gas Flow, 1.784 lambda, and 1758.77 kW mechanical engine power.

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“…Adding an internal heat exchanger to the ORC did not improve the performance under the given waste heat conditions. Kerme and Orfi [7] modeled ORC driven by parabolic through solar collectors to investigate the effect of turbine inlet temperature on main energetic and exergetic performance parameters for eight working fluids and o-xylene showed the maximum energetic and exergetic performance. Wang et al [8] analyzed a double ORC for discontinuous waste heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Basic and Regenerative Organic Rankine Cycles Using Dry Fluids From Waste Heat Recovery

Özdemir¹

2018

Journal of Thermal Engineering

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The organic Rankine cycle (ORC), which generates electric energy using low temperature heat sources, is a promising technology in energy production sector. The ORC, which uses an organic fluid with its lower boiling point and higher vapor pressure than water-steam as a working fluid. The thermal efficiency of an ORC showes the performance of system, depends on system compenents, working fluid and operating conditions. This paper presents an thermodynamics examination of basic ORC and regenerative ORC for waste heat recovery applications using dry organic fluids. R113, R114, R227ea, R245fa and R600a with the boiling points from -16 o C to 48 o C are selected in the analyses. The relationships between the ORC's performance parameters for basic and regenerative technologies and the properties of working fluids are evaluated based on various turbine inlet pressure values. Results show that regenerative ORC has higher thermal efficiency compared with basic ORC. Also, the thermal efficiency increases with the increment of the turbine inlet pressure for both basic ORC and regenerative ORC. Keywords: Energy, Exergy, Working Fluid, Organic Rankine Cycle, Regenerative Organic Rankine Cycle INTRODUCTIONEnergy is one of the most important sources to sustain life. Energy management and diversifying of energy resources are considered a significant way to increase energy efficiency, reduce greenhouse gas emissions and energy costs. Globally, fossil fuels continue to meet a dominant share of global energy demand, with implications for the links between energy, the environment and climate change. About 65% of the world energy consumption is supplied from fossil fuels which are increasingly disappearing and damage the ecology in the world. Consequently, the countries of the world target that renewable energy resources are used in energy conversion technology.Organic Rankine cycle (ORC) which generates electricity from renewable energy resources and waste heat, is an environmentally-friendly technology. The working principal of an ORC is similar to the common vapor Rankine cycle. However, it uses an organic fluid which has high molecular mass hydrocarbon compound, low critical temperature and pressure instead of water-steam as a working fluid. Useable heat resources in ORC are solar energy, geothermal energy, biomass products, surface seawater and waste heat from various thermal processes.Many studies on ORC have been presented in the literature. For example, Liu et al.[1] used total heatrecovery efficiency and heat availability instead of thermal efficiency as the evaluation criteria to optimize the working fluid and operating conditions for organic rankine cycle. Chen et al.[2] compared the system performance between a supercritical Rankine cycle using CO2 as working fluid and a subcritical ORC using R123 as working fluid. Kanoglu and Bolatturk [3] assessed the thermodynamic performance of the Reno (Nevada, USA) binary plant. This plant uses geothermal fluid at 158 o C and isobutene as working fluid. Exergy and energy e...

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Exergy-based thermodynamic analysis of solar driven Organic Rankine Cycle

Cited by 26 publications

References 27 publications

Advance Exergo-Economic Analysis of a Waste Heat Recovery System Using ORC for a Bottoming Natural Gas Engine

Advance Exergo-Economic Analysis of a Waste Heat Recovery System Using ORC for a Bottoming Natural Gas Engine

Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

Thermodynamic Analysis of Basic and Regenerative Organic Rankine Cycles Using Dry Fluids From Waste Heat Recovery

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