Author
Shoaib Khanmohammadi
Other affiliations: Power and Water University of Technology, University of Isfahan, University of Gilan
Bio: Shoaib Khanmohammadi is an academic researcher from Kermanshah University of Medical Sciences. The author has contributed to research in topics: Exergy & Exergy efficiency. The author has an hindex of 22, co-authored 71 publications receiving 1313 citations. Previous affiliations of Shoaib Khanmohammadi include Power and Water University of Technology & University of Isfahan.
Papers
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TL;DR: In this article, the authors evaluate irreversibility of each part of Neka CCPP using the exergy analysis and show that the combustion chamber, gas turbine, duct burner and heat recovery steam generator (HRSG) are the main sources of irreversability representing more than 83% of the overall exergy losses.
Abstract: Combined cycle power plants (CCPPs) have an important role in power generation. The objective of this paper is to evaluate irreversibility of each part of Neka CCPP using the exergy analysis. The results show that the combustion chamber, gas turbine, duct burner and heat recovery steam generator (HRSG) are the main sources of irreversibility representing more than 83% of the overall exergy losses. The results show that the greatest exergy loss in the gas turbine occurs in the combustion chamber due to its high irreversibility. As the second major exergy loss is in HRSG, the optimization of HRSG has an important role in reducing the exergy loss of total combined cycle. In this case, LP-SH has the worst heat transfer process.
The first law efficiency and the exergy efficiency of CCPP are calculated. Thermal and exergy efficiencies of Neka CCPP are 47 and 45.5% without duct burner, respectively. The results show that if the duct burner is added to HRSG, these efficiencies are reduced to 46 and 44%. Nevertheless, the results show that the CCPP output power increases by 7.38% when the duct burner is used. Copyright © 2007 John Wiley & Sons, Ltd.
232 citations
TL;DR: In this article, the impact of volume concentration of Fe3O4 nanoparticles and temperature on the viscosity and thermal conductivity of liquid paraffin based nanofluid was analyzed.
133 citations
TL;DR: In this paper, an Artificial Neural Network (ANN) was implemented to model the thermal conductivity and viscosity of liquid paraffin-Al2O3 nanofluid containing oleic acid surfactant against temperature, nanoparticle mass concentration and surfactants concentration.
111 citations
TL;DR: In this paper, a modified model is used to increase the precision of the gasifier thermodynamic model, and the authors deal with thermodynamic and economic analysis of a combined gas turbine and organic rankine cycle integrated with a biomass gasifier.
106 citations
TL;DR: In this article, an innovative biomass-based energy system is proposed for power and desalinated water production, which consists of a gasifier, a compressor, a heat exchanger, a gas turbine, a combustion chamber, and a Multi-effect desalination with thermal vapor compression (MED-TVC) unit.
89 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
TL;DR: In this article, a comprehensive exergy, exergoeconomic and environmental impact analysis and optimization is reported of several combined cycle power plants (CCPPs), and a multi-objective optimization is performed to determine the best design parameters, accounting for exergetic, economic and environmental factors.
441 citations
TL;DR: In this paper, a review of recent advances in the measurement and modeling of thermophysical properties at the nanoscale (from the solid state to colloids) is presented, including thermal conductivity, dynamic viscosity, specific heat capacity, and density.
322 citations
TL;DR: In this article, a double twisted tape was inserted in a H2O pipe to help its conductivity and a finite volume method was used to describe the flow and energy balance.
250 citations
TL;DR: In this article, an energy, exergy and exergoeconomic analysis for the Hamedan steam power plant is performed. But the results show that the most significant sources of exergy destruction in the boiler system are due to the combustion reaction and its high temperature.
Abstract: The objective of this paper is to perform the energy, exergy and exergoeconomic analysis for the Hamedan steam power plant. In the first part of the paper, the exergy destruction and exergy loss of each component of this power plant is estimated. Moreover, the effects of the load variations and ambient temperature are calculated in order to obtain a good insight into this analysis. The exergy efficiencies of the boiler, turbine, pump, heaters and the condenser are estimated at different ambient temperatures. The results show that energy losses have mainly occurred in the condenser where 306.9 MW is lost to the environment while only 67.63 MW has been lost from the boiler. Nevertheless, the irreversibility rate of the boiler is higher than the irreversibility rates of the other components. It is due to the fact that the combustion reaction and its high temperature are the most significant sources of exergy destruction in the boiler system, which can be reduced by preheating the combustion air and reducing the air–fuel ratio. When the ambient temperature is increased from 5 to 24°C, the irreversibility rate of the boiler, turbine, feed water heaters, pumps and the total irreversibility rate of the plant are increased. In addition, as the load varies from 125 to 250 MW (i.e. full load) the exergy efficiency of the boiler and turbine, condenser and heaters are increased due to the fact that the power plant is designed for the full load. In the second part of the paper, the exergoeconomic analysis is done for each component of the power plant in order to calculate the cost of exergy destruction. The results show that the boiler has the highest cost of exergy destruction. In addition, an optimization procedure is developed for that power plant. The results show that by considering the decision variables, the cost of exergy destruction and purchase can be decreased by almost 17.11%. Copyright © 2008 John Wiley & Sons, Ltd.
245 citations