Comparative energy,exergy and exergo-economic analysis of solar driven supercritical carbon dioxide power and hydrogen generation cycle |
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| Affiliation: | 1. Cyprus International University, Faculty of Engineering, Department of Energy Systems Engineering, Nicosia, North Cyprus via Mersin 10, Turkey;2. Mechanical Engineering Department, Mirpur University of Science & Technology, (MUST) Mirpur (10250), AJK, Pakistan;3. National University of Sciences and Technology, Islamabad, Pakistan;1. Department of Mechanical Engineering, Islamic Azad University, Shahrood Branch, Shahrood, Iran;2. Department of Energy Technology, Aalborg University, Denmark;1. Department of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iran;2. School of Mechanical Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran;1. Department of Electrical and Energy, Vocational School of Technical Sciences, Aksaray University, 68100, Aksaray, Turkey;2. Department of Mechatronic Engineering, Faculty of Technology, Applied Science University of Isparta, 32100, Isparta, Turkey;3. Department of Energy System Engineering, Faculty of Technology, Applied Science University of Isparta, 32100, Isparta, Turkey;1. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, PR China;2. Energy Systems Engineering Department, Cyprus International University, Haspolat-Lefkosa, Mersin 10, Turkey;3. Environmental Engineering Department, Cyprus International University, Haspolat-Lefkosa, Mersin 10, Turkey |
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| Abstract: | Parabolic dish solar collector system has capability to gain higher efficiency by converting solar radiations to thermal heat due to its higher concentration ratio. This paper examines the exergo-economic analysis, net work and hydrogen production rate by integrating the parabolic dish solar collector with two high temperature supercritical carbon dioxide (s-CO2) recompression Brayton cycles. Pressurized water (H2O) is used as a working fluid in the solar collector loop. The various input parameters (direct normal irradiance, ambient temperature, inlet temperature, turbine inlet temperature and minimum cycle temperature) are varied to analyze the effect on net power output, hydrogen production rate, integrated system energetic and exergetic efficiencies. The simulations has been carried out using engineering equation solver (EES). The outputs demonstrate that the net power output of the integrated reheat recompression s-CO2 Brayton system is 3177 kW, whereas, without reheat integrated system has almost 1800 kW net work output. The overall energetic and exergetic efficiencies of former system is 30.37% and 32.7%, respectively and almost 11.6% higher than the later system. The hydrogen production rate of the solarized reheat and without reheat integrated systems is 0.0125 g/sec and 0.007 g/sec, accordingly and it increases with rise in direct normal irradiance and ambient temperature. The receiver has the highest exergy destruction rate (nearly 44%) among the system components. The levelized electricity cost (LEC) of 0.2831 $/kWh with payback period of 9.5 years has proved the economic feasibility of the system design. The increase in plant life from 10 to 32 years with 8% interest rate will decrease the LEC from (0.434-0.266) $/kWh. Recuperators have more potential for improvement and their cost rate of exergy is higher as compared to the other components. |
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| Keywords: | Exergo-economic Hydrogen production LEC Electrolyzer Brayton cycle |
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