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    Daily comparison energy and exergy analysis and thermal energy storage performance of solar collectors
    (Nova Science Publishers, Inc., 2021) Atiz, Ayhan; Karakilcik, Hatice; Saxena, Abhishek; Karakilcik, Mehmet
    In this chapter, energy and exergy analyses of flat plate solar collectors (FPSCs), parabolic trough solar collectors (PTSCs) and evacuated tube solar collectors (ETSCs) were investigated for a day selected in January under daily solar radiation. For three different configurations, the surface area of each collector is considered as 50 m2, 100 m2, and 150 m2 separately. The analyses of the solar thermal system were carried out by using Engineering Equation Solver (EES) software under solar radiation from 8 a.m. to 17 p.m. The water at 9.5°C is upgraded to higher degree by the solar collectors (SCs) and pumped to a storage tank. The energy and exergy efficiencies were found depending on the three different surface areas of each solar collector. The maximum energy efficiencies of FPSCs, ETSCs and PTSCs for the surface area of 50 m2 were found as 49.54%, 66.22% and 68.95%, and the maximum exergy efficiency were found as 5.30%, 9.05% and 7.14%, respectively. The maximum energy efficiencies of FPSCs, ETSCs and PTSCs for the surface area of 100 m2 were found as 38.43%, 55.09% and 68.96%, and the maximum exergy efficiency were found as 5.93%, 10.79% and 12.79%, respectively. The maximum energy efficiencies of FPSCs, ETSCs and PTSCs for the surface area of 150 m2 were found as 31.39%, 46.84% and 68.95%, and the maximum exergy efficiency were found as 5.69%, 10.63% and 17.10%, respectively. It was found that the energy efficiency of FPSCs and ETSCs decreased with the increase in surface area and their low exergy efficiency did not change significantly. However, it was found that the energy efficiency of PTSCs did not change, but the exergy efficiency was increased. Therefore, PTSCs have higher exergetic performance compared to other two solar collectors and can be preferred in high power generation. © 2021 Nova Science Publishers, Inc. All rights reserved.
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    Hydrogen production and space heating using water heated by solar radiation
    (Nova Science Publishers, Inc., 2021) Atiz, Ayhan; Karakilcik, Hatice; Karakilcik, Mehmet
    In this chapter, water heating performance of evacuated tube solar collectors (ETSCs) which harvesting solar radiation is investigated. It is aimed to produce electricity and hydrogen with the hot water obtained. For this purpose, water from the geothermal source is pumped to the ETSCs to obtain water at sufficient temperature faster. Thus, a considerable amount of electrical energy is generated by the organic Rankine cycle (ORC) that is operated using water heated by solar radiation. N-butane and isobutane are considered as a working fluid in the ORC and it is found that the performance of n-butane is higher than isobutane. While hydrogen was produced with the electrical energy produced by the ORC, space heating was performed for mushroom production by using the waste heat in the system. Energy and exergy analyses of the system were carried out by utilizing the Engineering Equation Solver (EES) software. As a result, it is observed that under solar radiation, ETSCs can produce hot water at a temperature that will operate ORC and a significant amount of hydrogen can be produced. © 2021 Nova Science Publishers, Inc. All rights reserved.
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    INVESTIGATION OF ELECTRICITY, HYDROGEN AND CLEAN WATER PRODUCTION WITH RENEWABLE ENERGY SYSTEM INTEGRATED ONTO A SHIP: MOBILE ENERGY PRODUCTION ON A SHIP
    (International Association for Hydrogen Energy, IAHE, 2022) Erden, Mustafa; Atiz, Ayhan; Karakilcik, Hatice; Karakilcik, Mehmet
    In this study, sustainable portable renewable energy generation system with hydrogen production and desalination of sea water is proposed. For this purpose, a wind turbine, photovoltaic panels (PVs), parabolic through solar collectors (PTSCs), flash turbine, organic Rankine cycle (ORC), water electrolysis system, reverse osmosis unit (RO) and storage tanks are constructed on a ship. This system is suitable for coastal settlements with high solar and wind potentials which are short of drinking water and electrical energy. It is an advantageous system in that going to a place where it is needed and meet the demand there. This integrated system is conceptually modeled and simulated using Engineering Equation Solver (EES) software. Thus, the system produces 5947.20 MJ electric energy and 468.56 g of hydrogen with 38.06% and 38.87% maximum energy and exergy efficiencies, respectively. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.