Exergoeconomic analysis and optimization of basic, dual-pressure and dual-fluid ORCs and Kalina geothermal power plants: A comparative study

Shokati, Naser; Ranjbar, Faramarz; Yari, Mortaza

doi:10.1016/j.renene.2015.04.069

Cited by 212 publications

(54 citation statements)

References 35 publications

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“…Also, based on the results of the exergoeconomic analysis of the n‐heptane cycle which is presented in Table , it can be seen that the obtained values, and parameters in this study, despite the differences in the working fluid and boundary conditions and the pump efficiency, are in agreement with the results presented by Shokati et al…”

Section: Resultssupporting

confidence: 90%

“…Also, based on the results of the exergoeconomic analysis of the n-heptane cycle which is presented in Table 9, it can be seen that the obtained values, and parameters in this study, despite the differences in the working fluid and boundary conditions and the pump efficiency, are in agreement with the results presented by Shokati et al 44 According to the Figures 20 and 21, it is clear that the effect of the rise of the heat source temperature on the cycle efficiency has a linear trend, with the difference that in the toluene cycle, the minimum possible temperature for heat source is about 280°C and in the n-heptane cycle is about 255°C. In other words, at the current pressure, reducing the heat source temperature results into the refrigerant condensation which is problematic before entering into the turbine.…”

Section: F I G U R E 1supporting

confidence: 89%

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Analysis, economical and technical enhancement of an organic Rankine cycle recovering waste heat from an exhaust gas stream

Ghoreishi

Vakilabadi

Bidi

et al. 2019

Energy Science & Engineering

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Any effort with the aim of increasing the total electrical power generation (EPG) due to the existed constraints in vessels is desired in power plants. Using Organic Rankine Cycle (ORC) for recovering waste heat of an exhausting gas is considered as an auxiliary way for improving EPG value. In this study, four ORC arrangements were first modeled for six refrigerants by EES software and the first and second laws of thermodynamics efficiency (ηI and ηII, respectively) and mass flow rate were studied for these cycles. Based on modeling results, the best arrangement was selected for each refrigerant such as; F‐type (Reference cycle+ Intermediate recuperator+ Final recuperator) for R123, H‐type (Reference cycle+ Intermediate recuperator) for R114 and n‐butane and R‐type (Reference cycle + Final recuperator) for n‐pentane, n‐heptane, and toluene. The ηI value as a technical objective function was then optimized for the above cycles by Aspen HYSYS. n‐heptane and toluene cycles were chosen due to higher first‐law efficiency value and then were studied under different source temperature condition and n‐heptane cycle showed better adaptability. Afterward, exergoeconomic was applied on n‐heptane cycle and maximum cycle pressure was chosen as a design variable for economically optimizing net final income (NFI). Finally, NFI value is increased from 423.1$/kW·h to 609.9$/kW·h about 44.2%, while the second‐law efficiency value is just decreased from 25.6% to 20.6% about 5%.

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Section: Resultssupporting

confidence: 90%

Section: F I G U R E 1supporting

confidence: 89%

Analysis, economical and technical enhancement of an organic Rankine cycle recovering waste heat from an exhaust gas stream

Ghoreishi

Vakilabadi

Bidi

et al. 2019

Energy Science & Engineering

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“…At the time of writing, in the "ORC-PD tool", the following plant architectures are implemented: basic scheme and recuperative configuration, two-stage plant [70], regenerative and recuperative architecture [82], dual pressure levels and dual fluid schemes [34].…”

Section: The Orc Plant Designermentioning

confidence: 99%

“…Shokati et al [34] compared from energetic, exergetic and exergoeconomic viewpoints the basic dual-pressure and dual-fluid ORCs and the Kalina cycle for power generation from the geothermal fluid reservoir. In these cycles, the temperature, pressure and mass flow rate of the geothermal fluid are considered to be 175°C, 7 bar and 83 kg/s, respectively.…”

Section: Introductionmentioning

confidence: 99%

Biogas Engine Waste Heat Recovery Using Organic Rankine Cycle

Benato

Macor

2017

Energies

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Abstract:Italy is a leading country in the biogas sector. Energy crops and manure are converted into biogas using anaerobic digestion and, then, into electricity using internal combustion engines (ICEs). Therefore, there is an urgent need for improving the efficiency of these engines taking the real operation into account. To this purpose, in the present work, the organic Rankine cycle (ORC) technology is used to recover the waste heat contained in the exhaust gases of a 1 MW el biogas engine. The ICE behavior being affected by the biogas characteristics, the ORC unit is designed, firstly, using the ICE nameplate data and, then, with data measured during a one-year monitoring activity. The optimum fluid and the plant configuration are selected in both cases using an "in-house" optimization tool. The optimization goal is the maximization of the net electric power while the working fluid is selected among 115 pure fluids and their mixtures. Results show that a recuperative ORC designed using real data guarantees a 30% higher net electric power than the one designed with ICE nameplate conditions.

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“…Yang et al [8] made use of the ORC technology to recover the exhaust waste heat of diesel engine. Shokati et al [9] developed thermodynamic and enhanced exergoeconomic models for the basic, dual-pressure and dual-fluid ORCs as well as the Kalina cycle as binary cycles using a medium temperature geothermal fluid reservoir. Bernardo et al [10] presented an experimental application of an ORC in a ceramic industry for low grade waste heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Performance Analysis of Organic Rankine Systems for Stationary Compressed Natural Gas Engine

et al. 2017

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Abstract:The organic Rankine cycle (ORC) can be used to recover the waste heat from a stationary compressed natural gas (CNG) engine. However, the exhaust energy rate varies with engine load, which can influence the operating performance of the ORC system, therefore, it is necessary to study the running state of the ORC system. In this paper, first, the numerical simulation model of the ORC system is built by using GT-Suite software, with R245fa selected as the working fluid of the ORC system. The boundary conditions of the numerical simulation model are specified according to the measured data obtained by the stationary CNG engine test. Subsequently, the power output and dynamic characteristics of expander are analyzed to determine the running state of the ORC system. Investigations indicate that the fluctuation of refrigerant mass flow rate in the expander is obvious in the engine's low-load regions (from 20% engine load to 40% engine load). The performances of ORC system and stationary CNG engine-ORC combined system (combined system) are finally investigated, respectively. The results show that the thermal efficiency of the combined system can be increased by a maximum 5.0% (at the engine rated condition), while the brake specific fuel consumption (BSFC) can be reduced by a maximum 4.0% (at the engine rated condition).

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Exergoeconomic analysis and optimization of basic, dual-pressure and dual-fluid ORCs and Kalina geothermal power plants: A comparative study

Cited by 212 publications

References 35 publications

Analysis, economical and technical enhancement of an organic Rankine cycle recovering waste heat from an exhaust gas stream

Analysis, economical and technical enhancement of an organic Rankine cycle recovering waste heat from an exhaust gas stream

Biogas Engine Waste Heat Recovery Using Organic Rankine Cycle

Simulation and Performance Analysis of Organic Rankine Systems for Stationary Compressed Natural Gas Engine

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