Journal ArticleDOI
Performance analysis of the different Organic Rankine Cycles (ORCs) using dry fluids
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In this article, the first and second laws of thermodynamics analysis for organic Rankine cycles (ORCs), using dry organic fluids as the working fluids, were presented, and effects of the operating parameters such as turbine inlet temperature and pressure on the thermal efficiency, exergy destruction rate and second-law efficiency were evaluated.Abstract:
This paper presents the first and second laws of thermodynamics analysis for organic Rankine cycles (ORCs), using dry organic fluids as the working fluids. The dry organic fluids for this study were R227ea, RC318, R236fa, Isobutane, R600a, R245fa, HFE7000, R123 and R113. Effects of the operating parameters such as turbine inlet temperature and pressure on the thermal efficiency, exergy destruction rate and second-law efficiency were evaluated. The ORCs studied in this paper were regenerative ORC with IHE, regenerative ORC, ORC with IHE and basic ORC.read more
Citations
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Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery
TL;DR: In this article, the performance of different working fluids operating in specific regions was analyzed using a thermodynamic model built in Matlab together with this articlePROP, and the optimal control principle of ORC under the transient process was discussed based on the analytical results.
Journal ArticleDOI
Exergetic analysis of various types of geothermal power plants
TL;DR: In this article, a comparative study of different geothermal power plant concepts, based on the exergy analysis for high-temperature geothermal resources, is presented, and the performance of each cycle has been discussed in terms of second-law efficiency, exergy destruction rate, and first-law efficiencies.
Journal ArticleDOI
Exergy based fluid selection for a geothermal Organic Rankine Cycle for combined heat and power generation
TL;DR: In this paper, the authors compared series and parallel circuits of an ORC and an additional heat generation for geothermal resources at a temperature level below 450 k. The results showed that due to a combined heat and power generation, the second law efficiency of a geothermal power plant can be significantly increased in comparison to a power generation.
Journal ArticleDOI
Comprehensive analysis of energy, exergy and exergo-economic of cogeneration of heat and power in a combined gas turbine and organic Rankine cycle
TL;DR: In this article, the authors proposed a combined heat and power cycle combining a gas turbine (GT) and an ORC through a single-pressure heat recovery steam generator (HRSG), and the results revealed that the increase in pressure ratio and isentropic efficiency of air compressor and gas turbine efficiency improves thermodynamic performance of the system, however, the more increase of these parameters deteriorates the total cost rates.
Journal ArticleDOI
Performance evaluation of a low-temperature solar Rankine cycle system utilizing R245fa
TL;DR: In this paper, a low-temperature solar Rankine system utilizing R245fa as the working fluid is proposed and an experimental system is designed, constructed and tested, where both the evacuated solar collectors and the flat plate solar collectors are used in the experimental system, meanwhile, a rolling-piston R 245fa expander is also mounted in the system.
References
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Book
Thermodynamics : An Engineering Approach
Yunus A. Cengel,Michael A. Boles +1 more
TL;DR: The first law of thermodynamics -closed systems, control volumes, and the second law of entropy -a measure of disorder energy -are the properties of pure substances of high-speed fluid flow as mentioned in this paper.
Book
Fundamentals of Engineering Thermodynamics
TL;DR: In this article, the authors present an overview of the second law of thermodynamics and its application in the context of a gas turbine power plant and evaluate the entropy of the system.
Journal ArticleDOI
Working fluids for high-temperature organic Rankine cycles
TL;DR: In this article, a thermodynamic screening of 31 pure component working fluids for organic Rankine cycles (ORC) is given using BACKONE equation of state, the fluids are alkanes, fluorinated alkane, ethers and fluorinated ethers.
Journal ArticleDOI
Effect of working fluids on organic Rankine cycle for waste heat recovery
TL;DR: In this article, an analysis of the performance of organic Rankine cycle (ORC) subjected to the influence of working fluids is presented, which reveals that the thermal efficiency for various working fluid is a weak function of the critical temperature.
Journal ArticleDOI
Optimum design criteria for an Organic Rankine cycle using low-temperature geothermal heat sources
TL;DR: In this paper, a cost-effective optimum design criterion for organic Rankine power cycles utilizing low-temperature geothermal heat sources is presented, where the ratio of the total heat exchanger area to net power output is used as the objective function and was optimized using the steepest descent method.