Thermodynamic and technoeconomic optimization of Organic Rankine Cycle systems

Astolfi, Marco; Martelli, Emanuele; Pierobon, Leonardo

doi:10.1016/b978-0-08-100510-1.00007-7

Cited by 34 publications

(24 citation statements)

References 65 publications

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“…The cycle simulation model is run for each solution sampled by the optimization algorithm like a black-box function. The main advantage of the black-box strategy compared to the equation oriented (where all the model equations and stream variables are included in the optimization problem [48]) is the limited number of optimization variables which considerably im-proves the probability of finding the global optimum [18]. On the other hand, the cycle simulation may fail to reach convergence for some (random) combinations of the input variables.…”

Section: Optimization Algorithmmentioning

confidence: 99%

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Comparison of working fluids and cycle optimization for heat recovery ORCs from large internal combustion engines

Scaccabarozzi

Tavano

Invernizzi

et al. 2018

Energy

104

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This paper addresses the optimal working fluid selection for organic Rankine cycle recovering heat from heavy-duty internal combustion engines. Four cases are considered featuring two different engine exhaust temperatures (245 C vs 354 C) and two scenarios (maximum recovery of mechanical power vs. cogeneration of low-temperature heat). The analysis includes both pure fluids, including recently synthesized refrigerants, and binary mixtures. To perform a fair comparison between the different fluids, a computationally efficient cycle optimization approach, able to determine the maximum achievable efficiency for each working fluid, is adopted. The approach combines the evolutionary optimization al-gorithm PGS-COM with a rigorous heat integration methodology. The most efficient fluids are HCFO-1233zde, HFE-245fa2, HFO-1336mzz, HFE-347mcc, HFE-245cb2 and Novec 649 for the engine with lower temperature exhausts (reaching an ORC mechanical efficiency of 18.6e19.9%), and cyclopentane, ammonia, HCFO-1233zde, HFE-245fa2, HFO-1366mzz for the engine with higher temperature (reaching 23.76e22.70% efficiency). Compared to pure fluids, the use of optimized binary mixtures does not appear to lead a considerable efficiency gain.

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Section: Optimization Algorithmmentioning

confidence: 99%

“…For a thorough review of computer-aided fluid selection and ORC optimization approaches the reader is referred to respectively [17] and [18].…”

Section: Introductionmentioning

confidence: 99%

Comparison of working fluids and cycle optimization for heat recovery ORCs from large internal combustion engines

Scaccabarozzi

Tavano

Invernizzi

et al. 2018

Energy

104

View full text Add to dashboard Cite

show abstract

“…The performance parameters and technical constraints of the ORC sub-system model (carried out in Cycle-Tempo ® ) are summarized in Table 5 [5,17,27,28]. The maximum ORC working pressure and expander inlet temperature are limited to 25 bar and 10 • C under the maximum operative temperature (see Table 4), respectively, to ensure working under safe conditions, as well as the thermo-chemical stability of the working fluid.…”

Section: Organic Rankine Cycle (Orc)mentioning

confidence: 99%

A Distributed Generation Hybrid System for Electric Energy Boosting Fueled with Olive Industry Wastes

2019

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This paper presents the theoretical model and the simulation of a cutting edge hybrid power system composed of an externally-fired gas turbine (EFGT) coupled with an organic Rankine cycle (ORC) as a bottoming unit for the maximization of electrical power. The power plant is fed with different biomass sources from olive industry wastes (pruning, dry pomace, stones, leaves and twigs), providing more than 550 kW of electric power and a net electrical efficiency of 26.0%. These wastes were burnt directly at atmospheric pressure in an EFGT, producing 400 kW of electric power and exhaust gases at 300 °C. Ten suitable ORC working fluids have been studied to maximize the electric power generation: cyclohexane, isohexane, pentane, isopentane, neopentane, R113, R245fa, R365mfc, R1233zd and methanol. The best fluid was R1233zd, reaching 152.4 kW and 22.1% of ORC thermal efficiency; as drawback, however, R1233zd was not suitable for Combined Heat and Power CHP applications due its lower condensation temperature. Thus, despite R113 gave minor electricity production (137.5 kW) this allowed to generate additional thermal power (506.8 kW) in the way of hot water at 45 °C.

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“…The amount of working fluid charged into the system has a direct effect on the performance, the flexibility, as well as on the operational costs of the unit. The costs associated with the working fluid and possible working fluid losses due to leaks can be significant, especially in large-scale systems (up to 10% of the plant cost) [12].…”

Section: Importance Of Working Fluid Charge In Orc Systemsmentioning

confidence: 99%

Effects of the Working Fluid Charge in Organic Rankine Cycle Power Systems: Numerical and Experimental Analyses

Ziviani¹,

Dickes²,

Lemort³

et al. 2018

Organic Rankine Cycle Technology for Heat Recovery

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It is well known that organic Rankine cycle (ORC) power systems often operate in conditions differing from the nominal design point due to variations of the heat source and heat sink conditions. Similar to a vapor compression cycle, the system operation (e.g., subcooling level, pump cavitation) and performance (e.g., heat exchanger effectiveness) of an ORC are affected by the working fluid charge. This chapter presents a discussion of the effects of the charge inventory in ORC systems. In particular, both numerical and experimental aspects are presented. The importance of properly predicting the total amount of working fluid charge for optimizing design and off-design conditions is highlighted. Furthermore, an overview on state-of-the-art modeling approaches is also presented.

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Thermodynamic and technoeconomic optimization of Organic Rankine Cycle systems

Cited by 34 publications

References 65 publications

Comparison of working fluids and cycle optimization for heat recovery ORCs from large internal combustion engines

Comparison of working fluids and cycle optimization for heat recovery ORCs from large internal combustion engines

A Distributed Generation Hybrid System for Electric Energy Boosting Fueled with Olive Industry Wastes

Effects of the Working Fluid Charge in Organic Rankine Cycle Power Systems: Numerical and Experimental Analyses

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