Exergy and exergoeconomic analyses and optimization of geothermal organic Rankine cycle

El‐Emam, Rami S.; Dinçer, İbrahim

doi:10.1016/j.applthermaleng.2013.06.005

Cited by 195 publications

(76 citation statements)

References 25 publications

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“…Note that is the same definition as already used by other authors [13,27]. The properties of the working fluids play a vital role in the cycle performance.…”

Section: Organic Rankine Cyclementioning

confidence: 98%

“…A comprehensive design optimisation would require overall cost to be minimised for a given performance, by means of a parametric study. For example, El-Emam and Dincer [13] have carried out such an exercise for a geothermal ORC which could in future be extended to cover the RO within the self-powered desalination concept. Alternative conceptual approaches to enhancing ORC performance could be aimed at overcoming the limitation posed by the pinch point e.g., use of the Kalina cycle, or supercritical cycles to introduce a more nearly linear T-h characteristic in the evaporator.…”

Section: Equipment Design For Performance and Low Costmentioning

confidence: 99%

“…Igobo and Davies [12] developed an isothermal version of the ORC for use with a batch desalination process and, based on experiments with R245fa, predicted a specific energy thermal consumption of 2.5 kWh/m 3 at evaporator temperature of 90 °C in desalination of brackish water containing 4000 mg kg −1 NaCl at 70% recovery. A number of exergy studies have been carried out for ORC [13,14] and for RO separately [15,16], but relatively few for ORC coupled to RO [17,18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Self-Powered Desalination of Geothermal Saline Groundwater: Technical Feasibility

Davies

Orfi

2014

Water

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This theoretical study shows the technical feasibility of self-powered geothermal desalination of groundwater sources at <100 °C. A general method and framework are developed and then applied to specific case studies. First, the analysis considers an ideal limit to performance based on exergy analysis using generalised idealised assumptions. This thermodynamic limit applies to any type of process technology. Then, the analysis focuses specifically on the Organic Rankine Cycle (ORC) driving Reverse Osmosis (RO), as these are among the most mature and efficient applicable technologies. Important dimensionless parameters are calculated for the ideal case of the self-powered arrangement and semi-ideal case where only essential losses dependent on the RO system configuration are considered. These parameters are used to compare the performance of desalination systems using ORC-RO under ideal, semi-ideal and real assumptions for four case studies relating to geothermal sources located in India, Saudi Arabia, Tunisia and Turkey. The overall system recovery ratio (the key performance measure for the self-powered process) depends strongly on the geothermal source temperature. It can be as high as 91.5% for a hot spring emerging at 96 °C with a salinity of 1830 mg/kg. OPEN ACCESSWater 2014, 6 3410

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“…Note that is the same definition as already used by other authors [13,27]. The properties of the working fluids play a vital role in the cycle performance.…”

Section: Organic Rankine Cyclementioning

confidence: 98%

Section: Equipment Design For Performance and Low Costmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self-Powered Desalination of Geothermal Saline Groundwater: Technical Feasibility

Davies

Orfi

2014

Water

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“…The optimization of Rankine cycles has been widely studied [16,17]. Dias and others optimized the second-generation ethanol production [18], while other authors focused on obtaining the economical optima [19].…”

Section: Numerical Optimizationmentioning

confidence: 99%

Challenges in Bioenergy Production from Sugarcane Mills in Developing Countries: A Case Study

2014

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Worldwide energy policies are moving towards a reduction of fossil fuels' share in the energy mix and to invest in renewable and green energy sources. Biomass is one of these, and it represents, in the form of sugarcane, a strategic source in Colombia, especially in the Valle del Cauca. In this region, the sugarcane industry is able to convert the energy content of the cane into different energy products, such as ethanol, electricity, and high-pressure steam, which are cogenerated via bagasse combustion. In this work, the case of a sucrose and ethanol production plant, which mills ten thousand tons of sugarcane per day, is considered. A tailor-made computational model was developed to assess the energy and material process balances in order to estimate the effect of different operating conditions on cogeneration boilers and turbines, and to optimize the overall process efficiency. The current situation was modeled with good precision from the developed model. Likewise, the concept of "Renewable Efficiency" was introduced to explain the degree of green power, which a process plant is able to produce. Consequently, new innovative solutions and process layouts were proposed in order to increase their renewable efficiency. With the new configurations, a convenient energy surplus of up to 33 MW can be reached, which could be sold in the national electricity grid, representing long-term interesting economic benefits for the company. OPEN ACCESSEnergies 2014, 7 5875

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“…Wang et al [9] established an ORC system driven by solar energy. El-Emam et al [10] analyzed the thermodynamic and economic performances on a geothermal regenerative ORC system. Several scholars have considered the use of ORC systems to recover engine waste heat [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study on Mixed Working Fluids with Different Compositions in Organic Rankine Cycle (ORC) Systems for Vehicle Diesel Engines

Yang

Zhang

Wang

et al. 2014

Entropy

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Abstract:One way to increase the thermal efficiency of vehicle diesel engines is to recover waste heat by using an organic Rankine cycle (ORC) system. Tests were conducted to study the running performances of diesel engines in the whole operating range. The law of variation of the exhaust energy rate under various engine operating conditions was also analyzed. A diesel engine-ORC combined system was designed, and relevant evaluation indexes proposed. The variation of the running performances of the combined system under various engine operating conditions was investigated. R245fa and R152a were selected as the components of the mixed working fluid. Thereafter, six kinds of mixed working fluids with different compositions were presented. The effects of mixed working fluids with different compositions on the running performances of the combined system were revealed. Results show that the running performances of the combined system can be improved effectively when mass fraction R152a in the mixed working fluid is high and the engine operates with high power. For the mixed working fluid M1 (R245fa/R152a, 0.1/0.9, by mass fraction), the net power output of the combined system reaches the maximum of 34.61 kW. Output energy density of working fluid (OEDWF), waste heat recovery OPEN ACCESSEntropy 2014, 16 4770 efficiency (WHRE), and engine thermal efficiency increasing ratio (ETEIR) all reach their maximum values at 42.7 kJ/kg, 10.90%, and 11.29%, respectively.

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Exergy and exergoeconomic analyses and optimization of geothermal organic Rankine cycle

Cited by 195 publications

References 25 publications

Self-Powered Desalination of Geothermal Saline Groundwater: Technical Feasibility

Self-Powered Desalination of Geothermal Saline Groundwater: Technical Feasibility

Challenges in Bioenergy Production from Sugarcane Mills in Developing Countries: A Case Study

Study on Mixed Working Fluids with Different Compositions in Organic Rankine Cycle (ORC) Systems for Vehicle Diesel Engines

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