Exergo-economic analysis for screening of metal hydride pairs for thermochemical energy storage for solar baking system. (1st May 2022)

• Record Type: Journal Article
• Authors: Ayub, Iqra; Nasir, Muhammad Salman; Liu, Yang; Munir, Anjum; Wu, Zhen; Yang, Fusheng; Zhang, Zaoxiao
• Is Part Of: Thermal science and engineering progress. Volume 30(2022)
• Publication Date: 2022-05-01
• Subjects: Exergo-economic analysis -- Metal hydride based thermal energy storage -- Screening of metal hydride pair -- Exergy destruction and loss cost -- Annual levelized cost of the thermal energy storage system; Heat engineering -- Periodicals; Heat engineering; Thermodynamics; Periodicals; 621.402
• DOI: 10.1016/j.tsep.2022.101271
• Languages: English
• ISSNs: 2451-9049

Abstract

Graphical abstract: Highlights: Screening of metal hydride pair is done by employing exergo-economic analysis. A numerical simulation is performed to determine the exergy terms for the system. Exergo-economic model is developed to calculate annual levelized cost of system. Analysis provide clear insight into the mechanism of cost formation in the system. Abstract: The novelty of this research work is the exergo-economic analysis (including the cost of exergy destruction and exergy loss) of metal hydride based thermal energy storage system coupled with a solar bakery unit for the screening of metal hydride pairs ( Case 1 : pure MgH2 /LaNi5 & Case 2 : V2 O5 doped MgH2 /LaNi5 ) for thermochemical energy storage. Firstly, a numerical simulation is performed by using COMSOL Multiphysics 5.3a software. Secondly, an economic and exergo-economic model is developed to calculate the annual levelized cost of the thermal energy storage system. The life-cycle economic assessment findings indicate that the Levelized thermal energy storage cost of the pure MgH2 based system (32.28 $ /kWhth ) is 8.2 times higher than that of the V2 O5 doped MgH2 system (3.954 $/kWhth ). Moreover, an 87.75% decrease in cost was observed in Case 2 (V2 O5 doped MgH2 ). Furthermore, Case 2 (V2 O5 doped MgH2 ) can save 92.58 % of hydrogenation reaction time as compared to Case 1 (Pure MgH2 ). Ultimately, the selection of V2 O5 based MgH2 as a thermal heat-storing medium is then assessed as a better option for the MHTES for the solar bakery unit (SBU). The findings of this research provide a clear insight into the mechanism of cost formation in the system.