The Experts below are selected from a list of 44421 Experts worldwide ranked by ideXlab platform
Leonardo Pelagalli - One of the best experts on this subject based on the ideXlab platform.
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limiting the effect of ambient temperature on micro gas turbines mgts performance through Inlet Air cooling iac techniques an experimental comparison between fogging and direct expansion
Energy Procedia, 2015Co-Authors: Gabriele Comodi, Massimiliano Renzi, Flavio Caresana, Leonardo PelagalliAbstract:Abstract This paper describes a test bench that has been designed to evaluate the effect of Inlet Air cooling (IAC) techniques on the improvement of the performance of a 100 kWe micro gas turbine (MGT). In particular, two Inlet Air cooling techniques were tested: the fogging and the direct expansion. The results of the experimental analysis show that with the fogging technology the electric power augmentation ranges between 4% and 11% referred to the machine's ISO condition output depending on the initial conditions of the ambient Air humidity. During the tests with direct expansion technology, a net electric power augmentation up to 8% referred to the machine's ISO condition output was registered; also the net electric efficiency gain showed a peak of 1.5%.
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enhancing micro gas turbine performance in hot climates through Inlet Air cooling vapour compression technique
Applied Energy, 2015Co-Authors: Gabriele Comodi, Massimiliano Renzi, Flavio Caresana, Leonardo PelagalliAbstract:Abstract Microturbines (MGTs) are power generation devices showing very interesting performance in terms of low environmental impact, high-grade waste heat and very low maintenance cost. One of the main issues that affect the output of MGTs is their strong sensibility to Inlet Air temperature. Both in literature and in practical applications, several solutions have been applied to control the Inlet Air conditions and reduce the sensibility of this kind of machines to ambient conditions. One of the most interesting technology is the refrigerating vapour compression technique. This solution has already been used for medium/large GTs, but there are very limited Inlet Air cooling applications on MGTs and few experimental data are documented. This paper describes a test bench that has been designed to apply the direct vapour expansion technique to a 100 kWe MGT and reports the power and efficiency augmentation of the machine when operating in hot summer days. The chiller was designed to treat the MGT’s Air flow rate under specific working conditions and cool the Inlet Air temperature down to 15 °C. Thanks to the reduction of the Inlet Air temperature, the MGT showed a benefit in terms of electric power gain up to 8% with respect to the nominal power output in ISO conditions while the electric efficiency increased by 1.5%. Results indicate that an almost linear trend can be obtained both in the electric power increase and in the electric efficiency increase as a function of the Inlet Air temperature when the chiller operates under nominal working conditions. When the IAC device operates at a higher temperature or a higher humidity than the design one, the gain is limited; in some working conditions with high relative humidity, most of the beneficial effect can even be lost.
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enhancing micro gas turbine performance in hot climates through Inlet Air cooling vapour compression technique
Applied Energy, 2015Co-Authors: Gabriele Comodi, Massimiliano Renzi, Flavio Caresana, Leonardo PelagalliAbstract:Microturbines (MGTs) are power generation devices showing very interesting performance in terms of low environmental impact, high-grade waste heat and very low maintenance cost. One of the main issues that affect the output of MGTs is their strong sensibility to Inlet Air temperature. Both in literature and in practical applications, several solutions have been applied to control the Inlet Air conditions and reduce the sensibility of this kind of machines to ambient conditions. One of the most interesting technology is the refrigerating vapour compression technique. This solution has already been used for medium/large GTs, but there are very limited Inlet Air cooling applications on MGTs and few experimental data are documented. This paper describes a test bench that has been designed to apply the direct vapour expansion technique to a 100kWe MGT and reports the power and efficiency augmentation of the machine when operating in hot summer days.
Alok Ku Mohapatra - One of the best experts on this subject based on the ideXlab platform.
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comparative analysis of Inlet Air cooling techniques integrated to cooled gas turbine plant
Journal of The Energy Institute, 2015Co-Authors: Alok Ku MohapatraAbstract:Abstract The current article is focused on assessing the comparison of two different means of Inlet Air cooling (evaporative cooing and vapor compression cooling) integrated to a cooled gas turbine power plant. Air film cooling has been adopted as the cooling technique for gas turbine buckets. A parametric study of the effect of pressure ratio (r p,c ), compressor Inlet temperature (CIT), turbine Inlet temperature (TIT), Inlet temperature ratio (r IT ), ambient relative humidity and ambient temperature on performance parameters of plant has been carried out. It has been observed that the integration of the Inlet Air cooling system to the gas turbine cycle improves the overall performance, the improvement being higher at higher ambient temperature and ambient relative humidity. At a TIT = 1700 K, r p,c = 23, RH a = 0.2 and T a = 313 K, vapor compression Inlet Air cooling has been observed to improve the plant specific work by 18.4% and efficiency by 4.18%, compared to 10.48% and 4.6% respectively for evaporative cooling. In geographical regions having low ambient relative humidity and low ambient temperature however, evaporative Inlet Air cooling should be preferred over vapor compression cooling in terms of higher plant efficiency.. The adoption of higher turbine Inlet temperature has a more pronounced effect on vapor compression cooled gas turbine in terms of enhancement in plant performance parameters as compared to evaporative cooling. The work ratio increases with increase in value of r IT upto5.6 after which it decreases.
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thermodynamic assessment of impact of Inlet Air cooling techniques on gas turbine and combined cycle performance
Energy, 2014Co-Authors: Alok Ku MohapatraAbstract:The article is focused on the comparison of impact of two different methods of Inlet Air cooling (vapor compression and vapor absorption cooling) integrated to a cooled gas turbine based combined cycle plant. Air-film cooling has been adopted as the cooling technique for gas turbine blades. A parametric study of the effect of compressor pressure ratio, compressor Inlet temperature (Ti,C), turbine Inlet temperature (Ti,T), ambient relative humidity and ambient temperature on performance parameters of plant has been carried out. Optimum Ti,T corresponding to maximum plant efficiency of combined cycle increases by 100 °C due to the integration of Inlet Air cooling. It has been observed that vapor compression cooling improves the efficiency of gas turbine cycle by 4.88% and work output by 14.77%. In case of vapor absorption cooling an improvement of 17.2% in gas cycle work output and 9.47% in gas cycle efficiency has been observed. For combined cycle configuration, however, vapor compression cooling should be preferred over absorption cooling in terms of higher plant performance. The optimum value of compressor Inlet temperature has been observed to be 20 °C for the chosen set of conditions for both the Inlet Air cooling schemes.
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analysis of parameters affecting the performance of gas turbines and combined cycle plants with vapor absorption Inlet Air cooling
International Journal of Energy Research, 2014Co-Authors: Alok Ku MohapatraAbstract:SUMMARY The integration of an aqua-ammonia Inlet Air-cooling scheme to a cooled gas turbine-based combined cycle has been analyzed. The heat energy of the exhaust gas prior to the exit of the heat recovery steam generator has been chosen to power the Inlet Air-cooling system. Dual pressure reheat heat recovery steam generator is chosen as the combined cycle configuration. Air film cooling has been adopted as the cooling technique for gas turbine blades. A parametric study of the effect of compressor–pressure ratio, compressor Inlet temperature, turbine Inlet temperature, ambient relative humidity, and ambient temperature on performance parameters of plants has been carried out. It has been observed that vapor absorption Inlet Air cooling improves the efficiency of gas turbine by upto 7.48% and specific work by more than 18%, respectively. However, on the adoption of this scheme for combined cycles, the plant efficiency has been observed to be adversely affected, although the addition of absorption Inlet Air cooling results in an increase in plant output by more than 7%. The optimum value of compressor Inlet temperature for maximum specific work output has been observed to be 25 °C for the chosen set of conditions. Further reduction of compressor Inlet temperature below this optimum value has been observed to adversely affect plant efficiency. Copyright © 2013 John Wiley & Sons, Ltd.
Gabriele Comodi - One of the best experts on this subject based on the ideXlab platform.
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limiting the effect of ambient temperature on micro gas turbines mgts performance through Inlet Air cooling iac techniques an experimental comparison between fogging and direct expansion
Energy Procedia, 2015Co-Authors: Gabriele Comodi, Massimiliano Renzi, Flavio Caresana, Leonardo PelagalliAbstract:Abstract This paper describes a test bench that has been designed to evaluate the effect of Inlet Air cooling (IAC) techniques on the improvement of the performance of a 100 kWe micro gas turbine (MGT). In particular, two Inlet Air cooling techniques were tested: the fogging and the direct expansion. The results of the experimental analysis show that with the fogging technology the electric power augmentation ranges between 4% and 11% referred to the machine's ISO condition output depending on the initial conditions of the ambient Air humidity. During the tests with direct expansion technology, a net electric power augmentation up to 8% referred to the machine's ISO condition output was registered; also the net electric efficiency gain showed a peak of 1.5%.
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enhancing micro gas turbine performance in hot climates through Inlet Air cooling vapour compression technique
Applied Energy, 2015Co-Authors: Gabriele Comodi, Massimiliano Renzi, Flavio Caresana, Leonardo PelagalliAbstract:Abstract Microturbines (MGTs) are power generation devices showing very interesting performance in terms of low environmental impact, high-grade waste heat and very low maintenance cost. One of the main issues that affect the output of MGTs is their strong sensibility to Inlet Air temperature. Both in literature and in practical applications, several solutions have been applied to control the Inlet Air conditions and reduce the sensibility of this kind of machines to ambient conditions. One of the most interesting technology is the refrigerating vapour compression technique. This solution has already been used for medium/large GTs, but there are very limited Inlet Air cooling applications on MGTs and few experimental data are documented. This paper describes a test bench that has been designed to apply the direct vapour expansion technique to a 100 kWe MGT and reports the power and efficiency augmentation of the machine when operating in hot summer days. The chiller was designed to treat the MGT’s Air flow rate under specific working conditions and cool the Inlet Air temperature down to 15 °C. Thanks to the reduction of the Inlet Air temperature, the MGT showed a benefit in terms of electric power gain up to 8% with respect to the nominal power output in ISO conditions while the electric efficiency increased by 1.5%. Results indicate that an almost linear trend can be obtained both in the electric power increase and in the electric efficiency increase as a function of the Inlet Air temperature when the chiller operates under nominal working conditions. When the IAC device operates at a higher temperature or a higher humidity than the design one, the gain is limited; in some working conditions with high relative humidity, most of the beneficial effect can even be lost.
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enhancing micro gas turbine performance in hot climates through Inlet Air cooling vapour compression technique
Applied Energy, 2015Co-Authors: Gabriele Comodi, Massimiliano Renzi, Flavio Caresana, Leonardo PelagalliAbstract:Microturbines (MGTs) are power generation devices showing very interesting performance in terms of low environmental impact, high-grade waste heat and very low maintenance cost. One of the main issues that affect the output of MGTs is their strong sensibility to Inlet Air temperature. Both in literature and in practical applications, several solutions have been applied to control the Inlet Air conditions and reduce the sensibility of this kind of machines to ambient conditions. One of the most interesting technology is the refrigerating vapour compression technique. This solution has already been used for medium/large GTs, but there are very limited Inlet Air cooling applications on MGTs and few experimental data are documented. This paper describes a test bench that has been designed to apply the direct vapour expansion technique to a 100kWe MGT and reports the power and efficiency augmentation of the machine when operating in hot summer days.
Pouria Ahmadi - One of the best experts on this subject based on the ideXlab platform.
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optimization of fog Inlet Air cooling system for combined cycle power plants using genetic algorithm
Applied Thermal Engineering, 2015Co-Authors: M A Ehyaei, Pouria Ahmadi, Mojtaba Tahani, Mohammad Reza EsfandiariAbstract:Abstract In this research paper, a comprehensive thermodynamic modeling of a combined cycle power plant is first conducted and the effects of gas turbine Inlet fogging system on the first and second law efficiencies and net power outputs of combined cycle power plants are investigated. The combined cycle power plant (CCPP) considered for this study consist of a double pressure heat recovery steam generator (HRSG) to utilize the energy of exhaust leaving the gas turbine and produce superheated steam to generate electricity in the Rankine cycle. In order to enhance understanding of this research and come up with optimum performance assessment of the plant, a complete optimization is using a genetic algorithm conducted. In order to achieve this goal, a new objective function is defined for the system optimization including social cost of Air pollution for the power generation systems. The objective function is based on the first law efficiency, energy cost and the external social cost of Air pollution for an operational system. It is concluded that using Inlet Air cooling system for the CCPP system and its optimization results in an increase in the average output power, first and second law efficiencies by 17.24%, 3.6% and 3.5%, respectively, for three warm months of year.
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exergy economic and environment 3e analysis of absorption chiller Inlet Air cooler used in gas turbine power plants
International Journal of Energy Research, 2012Co-Authors: Mehdi Ali Ehyaei, S Hakimzadeh, N Enadi, Pouria AhmadiAbstract:SUMMARY Gas turbine (GT) output power is affected by temperature, gas turbine Inlet Air-cooling systems are used to solve this. In the present work, the effect of using absorption chiller in GT power plants for two regions in Iran, namely Tabas with hot–dry and Bushehr with hot–humid climate conditions is conducted. Therefore, output power, first and second law efficiencies, environmental and electrical costs for GT power plant with Inlet Air cooler are calculated for two mentioned regions, respectively. Results show that using this system in hot months of a year is economical. In addition, using absorption chiller leads to increasing the output power 11.5 and 10.3%, for Tabas and Bushehr cities, respectively. Moreover, by using this method the second law efficiency is increased to 22.9 and 29.4% for Tabas and Bushehr cities, respectively. In addition, the cost of electricity production for Tabas and Bushehr cities decreases to about 5.04 and 2.97%, respectively. Copyright © 2011 John Wiley & Sons, Ltd.
Fei Duan - One of the best experts on this subject based on the ideXlab platform.
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life cycle based enviroeconomic and thermal analyses of the Inlet Air cooled microturbine systems with liquefied natural gas cold energy
Journal of Cleaner Production, 2018Co-Authors: Baris Burak Kanbur, Liming Xiang, Swapnil Dubey, Fook Hoong Choo, Fei DuanAbstract:Abstract Liquefied natural gas cold utilization systems are used in the processes of three different Inlet Air-cooled microturbine systems to investigate the overall performances with respect to the life cycle-related enviroeconomic and thermal approaches as new defined aspects. The Inlet Air cooling applications increase the thermal efficiency and the power generation rate roundly by 3.2 and 7.7%, respectively, while the payback period of the Inlet-Air cooled system is closely higher than the conventional case. The life cycle-based environmental payback periods of the Inlet Air-cooled systems are found 3.25, 7.77, and 6.16% less than the conventional systems since the Inlet Air cooling applications achieve 3.25, 2.54, and 2.47% emission reductions of 30, 65, and 200 kW microturbine models, respectively. The integration of the life cycle assessment parameters increases the classical enviroeconomic parameters roundly by 100%. Moreover, different electricity and gas prices are studied to have more reliable data about the real engineering applications of the proposed systems. India, USA and Mexico are selected as the LNG importer countries for the case studies, and it is seen that the cold energy based Inlet Air cooling applications are more commercially viable for the regions where the fuel costs are relatively high whereas the systems become unfeasible with the low electricity prices.
