TY - JOUR
T1 - Adsorption of difluoromethane onto activated carbon based composites
T2 - Adsorption kinetics, heat of adsorption, cooling performance and irreversibility evaluation
AU - Yagnamurthy, Sai
AU - Rakshit, Dibakar
AU - Jain, Sanjeev
AU - Rocky, Kaiser Ahmed
AU - Islam, Md Amirul
AU - Saha, Bidyut Baran
N1 - Funding Information:
The authors would like to thank the Ministry of Education, Government of India for providing the necessary resources to carry out the present study under the Scheme for Promotion of Academic and Research Collaboration titled “Characterization and testing of the adsorption pairs of HFOs and ammonia with halide salts and functional activated carbon groups for application in adsorption heat pump/ cooling systems” (SPARC 1240).
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/6/25
Y1 - 2022/6/25
N2 - To further the research on R32 refrigerant-based adsorption cooling applications, Maxsorb-III activated carbon composites synthesized with the additives of H25 Graphene nanoplatelets (GNP), 1-Hexyl-3-methylimidazolium bis(trifluormethylsulfonyl)imide ([HMIM][Tf2N]) ionic liquid with polyvinyl alcohol (PVA) are studied for cooling performance evaluation. Their respective kinetic characteristics and heat of adsorption assessments are carried out for this purpose in the present study. The adsorption kinetics characteristics are studied using gravimetrically for the composite samples. A first-order kinetics model is seen to fit their kinetic uptakes with regression coefficients ≥ 0.97. The heat of adsorption estimates of the composites for varying uptakes and temperatures are numerically evaluated, incorporating the non-ideal behavior of the refrigerant. An approach for a holistic comparison of the cooling performances of the composites containing their respective heat and mass transfer characteristics for compact heat exchanger designs is further proposed. While the composite with the highest Maxsorb-III mass fraction yields the highest specific and volumetric cooling powers, the composite with the highest thermal conductivity requires the lowest heat exchanger area with a slightly larger adsorbent volume of around 12.1% over the former. A second law thermodynamic analysis is further carried out to evaluate the composite performances for cooling applications.
AB - To further the research on R32 refrigerant-based adsorption cooling applications, Maxsorb-III activated carbon composites synthesized with the additives of H25 Graphene nanoplatelets (GNP), 1-Hexyl-3-methylimidazolium bis(trifluormethylsulfonyl)imide ([HMIM][Tf2N]) ionic liquid with polyvinyl alcohol (PVA) are studied for cooling performance evaluation. Their respective kinetic characteristics and heat of adsorption assessments are carried out for this purpose in the present study. The adsorption kinetics characteristics are studied using gravimetrically for the composite samples. A first-order kinetics model is seen to fit their kinetic uptakes with regression coefficients ≥ 0.97. The heat of adsorption estimates of the composites for varying uptakes and temperatures are numerically evaluated, incorporating the non-ideal behavior of the refrigerant. An approach for a holistic comparison of the cooling performances of the composites containing their respective heat and mass transfer characteristics for compact heat exchanger designs is further proposed. While the composite with the highest Maxsorb-III mass fraction yields the highest specific and volumetric cooling powers, the composite with the highest thermal conductivity requires the lowest heat exchanger area with a slightly larger adsorbent volume of around 12.1% over the former. A second law thermodynamic analysis is further carried out to evaluate the composite performances for cooling applications.
UR - http://www.scopus.com/inward/record.url?scp=85126834061&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85126834061&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2022.118359
DO - 10.1016/j.applthermaleng.2022.118359
M3 - Article
AN - SCOPUS:85126834061
VL - 210
JO - Journal of Heat Recovery Systems
JF - Journal of Heat Recovery Systems
SN - 1359-4311
M1 - 118359
ER -