TY - JOUR
T1 - Activated carbon and graphene nanoplatelets based novel composite for performance enhancement of adsorption cooling cycle
AU - Pal, Animesh
AU - Uddin, Kutub
AU - Thu, Kyaw
AU - Saha, Bidyut Baran
N1 - Funding Information:
Authors acknowledge the Kyushu University Program for Leading Graduate School: Green Asia Education Center and International Institute for Carbon-Neutral Energy Research ( WPI-I2CNER ), Kyushu University, Japan for their financial support.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/1/15
Y1 - 2019/1/15
N2 - Adsorption cooling systems powered by low-grade thermal or renewable energy are considered as a potential alternative to the vapor compression systems. To improve the performance and compactness of the system, this study focuses on the synthesis and characterization of activated carbon (AC) composite employing graphene nanoplatelets (GNPs) namely H-grade and C-grade, and polyvinyl alcohol. The influence of GNPs on the porous properties, thermal conductivity, and ethanol adsorption characteristics of composites have been experimentally investigated. Porous properties results show that the studied composites possess high surface area and pore volume with microporous nature. The C-grade contained composite shows the higher porous properties compared to H-grade, however, thermal conductivity for the later one is the highest. The highest thermal conductivity is found to be 1.55 W m−1 K−1 for H-grade (40 wt%) contained composite which is 23.5 times higher than that of powder AC. Ethanol adsorption characteristics on studied composites are conducted gravimetrically at adsorption temperatures 30–70 °C. Experimental data are also fitted with Tóth and Dubinin-Astakhov (D-A) isotherm models within ±5% RMSD and found 23% improvement of effective volumetric uptake for H25 (20 wt%) composite compared to parent AC. The instantaneous ethanol adsorption uptake onto composites has also been presented for adsorption temperature 30 °C and evaporator pressure at 1.8 kPa.
AB - Adsorption cooling systems powered by low-grade thermal or renewable energy are considered as a potential alternative to the vapor compression systems. To improve the performance and compactness of the system, this study focuses on the synthesis and characterization of activated carbon (AC) composite employing graphene nanoplatelets (GNPs) namely H-grade and C-grade, and polyvinyl alcohol. The influence of GNPs on the porous properties, thermal conductivity, and ethanol adsorption characteristics of composites have been experimentally investigated. Porous properties results show that the studied composites possess high surface area and pore volume with microporous nature. The C-grade contained composite shows the higher porous properties compared to H-grade, however, thermal conductivity for the later one is the highest. The highest thermal conductivity is found to be 1.55 W m−1 K−1 for H-grade (40 wt%) contained composite which is 23.5 times higher than that of powder AC. Ethanol adsorption characteristics on studied composites are conducted gravimetrically at adsorption temperatures 30–70 °C. Experimental data are also fitted with Tóth and Dubinin-Astakhov (D-A) isotherm models within ±5% RMSD and found 23% improvement of effective volumetric uptake for H25 (20 wt%) composite compared to parent AC. The instantaneous ethanol adsorption uptake onto composites has also been presented for adsorption temperature 30 °C and evaporator pressure at 1.8 kPa.
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U2 - 10.1016/j.enconman.2018.10.092
DO - 10.1016/j.enconman.2018.10.092
M3 - Article
AN - SCOPUS:85056205638
SN - 0196-8904
VL - 180
SP - 134
EP - 148
JO - Energy Conversion and Management
JF - Energy Conversion and Management
ER -
