Assessment of hydrogen generation and thermodynamic efficiencies of PEM coupled with PV and PV-T under diverse circumstances


ATIZ A., KARAKILÇIK M.

International Journal of Hydrogen Energy, 2024 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2024
  • Doi Number: 10.1016/j.ijhydene.2024.01.072
  • Journal Name: International Journal of Hydrogen Energy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Artic & Antarctic Regions, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Environment Index, INSPEC
  • Keywords: Electricity generation, Energy and exergy efficiency, Hydrogen production and storage, PEM electrolyzer, Solar radiation and exergy
  • Çukurova University Affiliated: Yes

Abstract

Hydrogen is increasingly recognized as a pivotal fuel source globally, and the generation of hydrogen from solar energy is playing a crucial role in this trend. Solar energy is highly valued for its renewability, eco-friendliness, cost-effectiveness, and ease of installation. In this present work, we assessed the electricity generation of photovoltaic-thermal and photovoltaic systems which are using solar energy. The water-cooled PV-T system was cooled at three different flow rates (0.3 kg/s, 0.39 kg/s, and 0.48 kg/s) for a total panel area of 108 m2. Electricity generated within both systems was actively utilized for hydrogen production. This electricity was employed in a Proton Exchange Membrane electrolyzer to generate hydrogen. The simulations were carried out utilizing the Engineering Equation Solver for a specific day in July, encompassing the hours from 8 a.m. to 5 p.m., with each hour being considered. Daily electrolyzer performance was affected by the voltage and current density effects of four different electricity generation configurations, as well as the change in ambient temperature. The daily electricity production for PVs and PV-Ts, with cooling flow ratios of 0.3 kg/s, 0.39 kg/s, and 0.48 kg/s, was 338.2 MJ, 344.89 MJ, 351.42 MJ, and 356.08 MJ, respectively. Additionally, the daily hydrogen production with PEM in combination with PVs and PV-Ts, both without cooling and with the same flow rates, was 1617.2 g, 1646.5 g, 1675.3 g, and 1696 g, respectively. The maximum energy efficiency for PEM was 70.01 %, 69.98 %, 69.95 %, and 69.92 %, while the highest exergy efficiency for the same configuration was 59.75 %, 59.72 %, 59.69 %, and 59.67 %, respectively. In summary, the application of cooling to solar panels leads to increased electricity generation, resulting in higher current and voltage for the PEM. This has minimal adverse effects on the energy and exergy efficiencies of the PEM. Despite a slight negative impact, the cooled system outperforms the non-cooled one in hydrogen production. Furthermore, the system achieved its maximum energy and exergy efficiencies, reaching 50.24 % and 9.772 % when using mass flow ratios of 0.48 kg/s and 0.30 kg/s in PV-T on the selected day.