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Abstract
The performance indicators of Brayton cycle configurations (BCY) for the topping cycle application are presented. The indicators include exergy efficiency, ecological efficiency, sustainability index, environmental impact, and economic parameters. The study's objective is to access the key indicators of sustainability and investment cost to provide valid information for the choice of GT configuration as topping cycles. Five BCY configurations (Model 1 to Model 5) were studied. The maximum exergy efficiency of 28 % was obtained across the studied models. In addition, the waste exergy ratios, environmental effect factors, and CO2 emissions were determined for each model. The CO2 emissions were found to vary from 102.8 to 168 kg/MWh. Model 1 and Model 5 had the highest payback periods of 2.3 and 3.6 years, respectively, with the least unit cost of energy. Similarly, the highest cost of investment was obtained with Model 5. Results from the TOPPIS analysis show that the closeness to the final positive ideal solution varied from 0.218 to 0. 56 across the BCYs. The best model close to ideality was model 5 and thus ranked first and based principally on economic, technical, and environmental sustainability. Furthermore, the optimization results show that there are prospects for system retrofitting.
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References
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References
G. Mohan, S. Dahal, U. Kumar, A. Martin., H. Kayal. Development of natural gas fired combined cycle plant for tri-generation of power, cooling and clean water using waste heat recovery: Techno-economic analysis. Energies, 7(2014) 6358-6381.doi: 10.3390/en7106358.
I.H. Njoku, C.O.C Oko, J.C. Ofodu. Performance evaluation of a combined cycle power plant integrated with organic Rankine cycle and absorption refrigeration system. Cogent Engineering 5(2018) 1451426. https://doi.org/10.1080/23311916.2018.1451426
C. O. C Oko, I. H Njoku. Performance analysis of an integrated gas-, steam- and organic fluid-cycle thermal power plant. Energy 122(2017) 31-443.doi:10.1016/j. energy.2017.01.107.
A. Moharamian, S. Soltani, M. A. Rosen, S. M Mahmoudi. (2017). Exergoeconomic and thermodynamic analyses of an externally fired combined cycle with hydrogen and injection to the combustion chamber. Inter J Hydrogen (2017)1-12.doi: https://doi.org/10.1016/j.ijhydene.2017.11.136
F. Khalid, I. Dincer, M. Rosen. Energy and exergy analyses of a solar-biomass integrated cycle for multigeneration. Solar Energy 112(2015), 290-299.
M. Maheshwaria, O. Singhb. Thermodynamic study of different configurations of gas- steam combined cycles employing intercooling and different means of cooling in topping cycle. Applied Therm Eng 169(2019) 114249.
F. I Abam, E. D. Ogheneruona, E. B. Ekwe, A. Mohammed, D. S. Olusegun, A. K. Zafar., M. Imran, M. Farooq. Exergoeconomic and Environmental Modeling of Integrated Polygeneration Power Plant with Biomass-Based Syngas Supplemental Firing. Energies 13 (2020) 6018; doi: 10.3390/en13226018.
H. Aydin. Exergetic sustainability analysis of LM6000 gas turbine power plant with steam cycle. Energy 57(2013)766-774. http://dx.doi.org/10.1016/j.energy.2013.05.018.
O. Balli, A. A. Hepbasli. Exergoeconomic, sustainability and environmental damage cost
analyses of T56 turboprop engine, Energy 64(2014) 582-600. http://dx.doi.org/10.1016/j.energy.2013.09.066.
H. Aydın, T. Önder, H. T. Karako, A. Midilli. Exergo-sustainability indicators of a turboprop aircraft for the phases of a flight. Energy58 (2013) 550-560. http://dx.doi.org/10.1016/j.energy.2013.04.076.
M. Haroon, N.A Sheikh, A. Ayub, R. Tariq, F. Sher, A. T. Baheta, M. Imran. Exergetic, economic and exergo-environmental analysis of bottoming power cycles operating with CO2-based binary mixture. Energies 13(2020) 5080.
A. Midilli, I. Dincer. Development of some exergetic parameters for PEM fuel cells for measuring environmental impact and sustainability. Inter J H Energy 34 (2009) 3858–3872.
M. Jankowski, A. Borsukiewicz. A Novel Exergy Indicator for Maximizing Energy Utilization in Low-Temperature ORC. Energies 13(2020)1598; doi: 10.3390/en13071598.
F.I Abam, E. B Ekwe, S.O Effiom, M.C Ndukwu, T.A Briggs, C.H Kadurumba,. Optimum exergetic performance parameters and thermo-sustainability indicators of low temperature modified organic Rankine cycles (ORCs). Sustainable Energy Technology and Assessments 30(2018)91-104.
P. Ifaei, A. Ataei, C. Yoo. Thermoeconomic and environmental analyses of a low water consumption combined steam power plant and refrigeration Chillers-Part 2: Thermoeconomic an environmental analysis 2016, Energy Convers Manage, http://dx.doi.org/10.1016/j.enconman.2016.06.030.
T. Karakoc, H. Aydin, O. Turan, A. Midilli. Exergo-Sustainability Indicators of a Turboprop Aircraft for the Phases of a Flight, Energy 58(2013) 550-560.
M. C. Ndukwu, F. I. Abam, S. I. Manuwa, T. A. Briggs. Exergetic performance indicators of a direct evaporative cooling system with different evaporative cooling pads. Inter J. of Ambient Energy.38 (7) (2017)701-709 http://dx.doi.org/10.1080/01430750.2016.1195774
M. Cardu, M. Baica. Regarding a global methodology to estimate the energy-ecologic efficiency of thermo power plants. Energy Conver Manage 40(1999) 71-87.
C. F. Santos, R. F. Paulino, C. E. Tuna, J. L. Silveira, F. H. Araújo. Thermodynamic analysis and ecological efficiency of a combined cycle power plant. Thermal Engineering, 13:2(2014) 03-08.
F.I Abam, T.A.Briggs, E. O. Diemuodeke, B.E. Ekwe, K.N Ujoatuonu, J. Isaac, M.C Ndukwu. Thermodynamic and economic analysis of a Kalina system with integrated lithium-bromide-absorption cycle for power and cooling production. Energy Rep 6 (2020) 1992–2005.
C. Hwang, K. Yoon, K. (1981). Multiple Attribute Decision Making Methods and Applications: A State-of-the-Art Survey (1st Edn.). Berlin Heidelberg New York: Springer-Verlag (1981).
G. O. Odu. Weighting Methods for Multi-Criteria Decision Making Technique. J. Appl. Sci. Environ. Manage, 23(8) (2019)1449-1457.
F.I. Abam, D.C Onyejekwe, G.O Unachukwu. The effect of ambient temperature on components performance of an in-service gas turbine plant using exergy method. Singapore Journal of Scientific Research 1(1)(2011)23-37.
