TY - JOUR
T1 - Full-spectrum volumetric solar thermal conversion via graphene/silver hybrid plasmonic nanofluids
AU - Mehrali, Mohammad
AU - Ghatkesar, Murali Krishna
AU - Pecnik, Rene
PY - 2018
Y1 - 2018
N2 - The wide-spread adoption of solar thermal absorbers is currently hampered by their low absorption efficiencies and their high capital cost. As a result, a number of initiatives, including direct absorption solar collectors (DASC), are currently underway to improve the absorber efficiencies. In this regard, this study focused on application of hybrid nanofluids containing reduced graphene oxides decorated with silver nanoparticles in volumetric solar absorbers. Their superior solar absorptance and thermal conductivity is based on the plasmonic effect of the nanoparticles and high thermal conductivity of graphene nanosheets, respectively. Several parameters such as mass concentration of graphene nanosheets and Ag decoration contents were studied that could affect the thermal and optical properties of the nanofluids. The results indicated that the prepared nanofluids can be employed for direct absorption solar collectors over a short period of solar irradiation time, even at a low illumination intensity of one sun. A collector efficiency of 77% is achievable at low concentration of 40 ppm owing to the enhanced light absorption of graphene at the excitation wavelength. These findings therefore suggest that this solution can contribute to the final goal of utilizing nanofluids for efficient solar thermal energy harvesting.
AB - The wide-spread adoption of solar thermal absorbers is currently hampered by their low absorption efficiencies and their high capital cost. As a result, a number of initiatives, including direct absorption solar collectors (DASC), are currently underway to improve the absorber efficiencies. In this regard, this study focused on application of hybrid nanofluids containing reduced graphene oxides decorated with silver nanoparticles in volumetric solar absorbers. Their superior solar absorptance and thermal conductivity is based on the plasmonic effect of the nanoparticles and high thermal conductivity of graphene nanosheets, respectively. Several parameters such as mass concentration of graphene nanosheets and Ag decoration contents were studied that could affect the thermal and optical properties of the nanofluids. The results indicated that the prepared nanofluids can be employed for direct absorption solar collectors over a short period of solar irradiation time, even at a low illumination intensity of one sun. A collector efficiency of 77% is achievable at low concentration of 40 ppm owing to the enhanced light absorption of graphene at the excitation wavelength. These findings therefore suggest that this solution can contribute to the final goal of utilizing nanofluids for efficient solar thermal energy harvesting.
KW - Direct absorption solar collectors
KW - Graphene nanofluid
KW - Optical properties
KW - Plasmonic nanofluid
KW - Solar absorption
UR - http://www.scopus.com/inward/record.url?scp=85046660834&partnerID=8YFLogxK
UR - http://resolver.tudelft.nl/uuid:05d24c8d-f3a9-4578-98db-17d66b7f9ded
U2 - 10.1016/j.apenergy.2018.04.065
DO - 10.1016/j.apenergy.2018.04.065
M3 - Article
AN - SCOPUS:85046660834
SN - 0306-2619
VL - 224
SP - 103
EP - 115
JO - Applied Energy
JF - Applied Energy
ER -