Multi-objective optimization of the hydrogen fuel production of a solar-based cobalt-chlorine (Co-Cl) thermochemical cycle with grey relational analysis


Creative Commons License

ÇAKIROĞLU R., ÇİNİCİ O. K., ASAL Ş., ACIR A.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol.68, pp.360-373, 2024 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 68
  • Publication Date: 2024
  • Doi Number: 10.1016/j.ijhydene.2024.04.219
  • 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
  • Page Numbers: pp.360-373
  • Gazi University Affiliated: Yes

Abstract

In this paper, multi -objective optimization of the hydrogen production ( (center dot) m H 2 ) of a solar -based cobalt -chlorine (Co - Cl) thermochemical cycle with grey relational analysis (GRA) has been performed. Monthly total irradiance averages (A), wind velocity (B), receiver height (C), receiver radius (D) and number of heliostats (E) are considered to achieve the highest the useful energy absorbed by the solar receiver ( (center dot) Q abs ), efficiency of the receiver ( ', rec ), the overall efficiency of the system ( ', overall ) and hydrogen production ( (center dot) m H 2 ). Orthogonal experimental design is planned according to L 18 orthogonal array created by Taguchi method. The percent contribution rates (PCR) on the (center dot) Q abs , ', rec , ', overall and (center dot) m H 2 are determined with the help of ANOVA analysis. The optimal parameters are identified as monthly total irradiance average of 143.8 kW h (A 3 ), wind velocity of 5 m/s (B 2 ), receiver height of 8 m (C 1 ), receiver radius of 3 m (D 1 ) and number of heliostats of 850 (E 3 ), respectively. The highest (center dot) Q abs , ', rec , ', overall and (center dot) m H 2 values corresponding to A 3 B 2 C 1 D 1 E 3 are obtained as 50.2 GW; 64.1%; 22.2% and 122.59 (tons/month), respectively. The PCR of the A, B, C, D and E parameters influencing the f -factor are determined to be 12.6 %, 1.92 %, 0.48 %, 15.03 %, and 53.20 %, respectively. Also, empirical equations are developed with regression analysis (RA) to estimate the (center dot) Q abs , ', rec , ', overall , (center dot) m H 2 values. The statistical coefficients (R 2 -value) for training and testing data ' s are determined in the range of 0.771167 - 0.99608 for (center dot) Q abs , ', rec , ', overall and (center dot) m H 2 , respectively.