Multicomponent Working Fluids For Organic Rankine Cycles (ORCs)

Angelino, G.; Colonna, Piero

doi:10.1016/s0360-5442(98)00009-7

Cited by 279 publications

(142 citation statements)

References 7 publications

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“…The characteristics of a thermal energy source affects the optimal choice of working fluid (WF) for an ORC (e.g. [10][11][12][13][14][15][16][17][18][19][20]). Different objective functions have been used for WF selection, such as the ratio of net power output to heat exchanger area (Ẇ net /A) [10], net power output (Ẇ net ) [14,19,21,22] and first or second law efficiencies [7, 11-13, 16-18, 20].…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of a binary geothermal power plant

Ghasemi

Paci

Tizzanini

et al. 2013

Energy

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6A model is developed for an existing organic Rankine cycle (ORC) utilizing a low temperature geothermal source. The model is implemented in Aspen Plus ® and used to simulate the performance of the existing ORC equipped with an air-cooled condensation system. The model includes all the actual characteristics of the components. The model is validated by approximately 5000 measured data in a wide range of ambient temperatures. The net power output of the system is maximized. The results suggest different optimal operation strategies based on the ambient temperature. Existing literature claims that no superheat is optimal for maximum performance of the system; this is confirmed only for low ambient temperatures. For moderate ambient temperatures (T amb ≥ 1.7 ) superheat maximizes net power output of the system. The value of the optimal superheat increases with increasing ambient temperature.The optimal operation boosts the total power produced in a year by 9%. In addition, a simpler and semi-analytic model is developed that enables very quick optimization of the operation of the cycle. Based on the pinch condition at the condenser, a simple explicit formula is derived that predicts the outlet pressure of the turbine as a function of mass flow rate of working fluid.

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Section: Introductionmentioning

confidence: 99%

Modeling and optimization of a binary geothermal power plant

Ghasemi

Paci

Tizzanini

et al. 2013

Energy

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“…The use of non-azeotropic mixtures, as working fluids in Rankine cycles, has been proposed by many authors in the past years, see for example, [1,2,3,4], just with the aim of reducing the thermal irreversibilities in the heat introduction process, particularly between the heat source and the evaporating working fluid.…”

Section: Introductionmentioning

confidence: 99%

Heat recovery from Diesel engines: A thermodynamic comparison between Kalina and ORC cycles

Bombarda¹,

Invernizzi²,

Pietra³

2010

Applied Thermal Engineering

320

116

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To cite this version:Paola Bombarda, Costante Invernizzi, Claudio Pietra. Heat recovery from Diesel engines: a thermodynamic comparison between Kalina and ORC cycles. Applied Thermal Engineering, Elsevier, 2009, 30 (2-3) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Although the obtained useful powers are actually equal in value, the Kalina cycle requires a very high maximum pressure in order to obtain high thermodynamic performances (in our case, 100 bar against about 10 bar for the ORC cycle). So, the adoption of Kalina cycle, at least for low power level and medium-high temperature thermal 2 ACCEPTED MANUSCRIPT sources, seems not to be justified because the gain in performance with respect to a properly optimized ORC is very small and must be obtained with a complicated plant scheme, large surface heat exchangers and particular high pressure resistant and no-corrosion materials. ACCEPTED MANUSCRIPT

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“…By implementing a zeotropic mixture as the working fluid, it is possible to evaporate and condense the working fluid non-isothermally at subcritical pressures. This enables a reduction in the temperature difference between the heat exchanging streams both for the condenser and the boiler resulting in an increase in cycle performance [4]. Analyses of the irreversibilities in the cycle components have identified the condenser as achieving the largest benefits from the non-isothermal phase-change, and the mixture composition minimizing the condenser losses tends to coincide with the composition which maximizes cycle performance [5,6].…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of a novel organic Rankine cycle with improved boiling process

Andreasen¹,

Larsen

Knudsen³

et al. 2015

Energy

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In this paper we present a novel organic Rankine cycle layout, named the organic splitcycle, designed for utilization of low grade heat. The cycle is developed by implementing a simplified version of the split evaporation concept from the Kalina split-cycle in the organic Rankine cycle in order to improve the boiling process. Optimizations are carried out for eight hydrocarbon mixtures for hot fluid inlet temperatures at 120 • C and 90 • C, using a genetic algorithm to determine the cycle conditions for which the net power output is maximized. The most promising mixture is an isobutane/pentane mixture which, for the 90 • C hot fluid inlet temperature case, achieves a 14.5 % higher net power output than an optimized organic Rankine cycle using the same mixture. Two parameter studies suggest that optimum conditions for the organic split-cycle are when the temperature profile allows the minimum pinch point temperature difference to be reached at two locations in the boiler. Compared to the transcritical organic Rankine cycle, the organic split-cycle improves the boiling process without an entailing increase in the boiler pressure, thus enabling an efficient low grade heat to power conversion at low boiler pressures.

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Multicomponent Working Fluids For Organic Rankine Cycles (ORCs)

Cited by 279 publications

References 7 publications

Modeling and optimization of a binary geothermal power plant

Modeling and optimization of a binary geothermal power plant

Heat recovery from Diesel engines: A thermodynamic comparison between Kalina and ORC cycles

Design and optimization of a novel organic Rankine cycle with improved boiling process

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