Browsing by Author "Mekhilef, S."

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Citation - WoS: 106
Citation - Scopus: 122
Energy- economic- and environmental analysis of a flat-plate solar collector operated with SiO2 nanofluid
(SPRINGER, 2015) M. Faizal; R. Saidur; S. Mekhilef; Arif Hepbasli; I. M. Mahbubul; Mekhilef, S.; Mahbubul, I. M.; Saidur, R.; Hepbasli, A.; Faizal, M.
To overcome the environmental impact and declining source of fossil fuels renewable energy sources need to meet the increasing demand of energy. Solar thermal energy is clean and infinite suitable to be a good replacement for fossil fuel. However the current solar technology is still expensive and low in efficiency. One of the effective ways of increasing the efficiency of solar collector is to utilize high thermal conductivity fluid known as nanofluid. This research analyzes the impact on the performance fluid flow heat transfer economic and environment of a flat-plate solar thermal collector by using silicon dioxide nanofluid as absorbing medium. The analysis is based on different volume flow rates and varying nanoparticles volume fractions. The study has indicated that nanofluids containing small amount of nanoparticles have higher heat transfer coefficient and also higher energy and exergy efficiency than base fluids. The measured viscosity of nanofluids is higher than water but it gives negligible effect on pressure drop and pumping power. Using SiO2 nanofluid in solar collector could also save 280 MJ more embodied energy offsetting 170 kg less CO2 emissions and having a faster payback period of 0.12 years compared to conventional water-based solar collectors.
Citation - WoS: 200
Citation - Scopus: 245
Performance enhancement of a Flat Plate Solar collector using Titanium dioxide nanofluid and Polyethylene Glycol dispersant
(Elsevier Ltd, 2015) Zafar Said; M. A. Sabiha; Rahman Saidur; A. Hepbasli; Nasrudin Abd Rahim; Saad Mekhilef; Thomas Arthur Ward; Said, Z.; Sabiha, M.A.; Hepbasli, A.; Rahim, N.A.; Mekhilef, S.; Ward, T.A.; Saidur, R.
The use of TiO2-water nanofluid as a working fluid for enhancing the performance of a flat plate solar collector has been studied. The volume fraction of the nanoparticles was 0.1% and 0.3% respectively while the mass flow rates of the nanofluid varied from 0.5 to 1.5 kg/min respectively. Thermo-physical properties and reduced sedimentation for TiO2-nanofluid was obtained using PEG 400 dispersant. The results reveal the impact and importance of each of these parameters. Energy efficiency increased by 76.6% for 0.1% volume fraction and 0.5 kg/min flow rate whereas the highest exergy efficiency achieved was 16.9% for 0.1% volume fraction and 0.5 kg/min flow rate. Results showed that the pressure drop and pumping power of TiO2 nanofluid was very close to the base fluid for the studied volume fractions. © 2021 Elsevier B.V. All rights reserved.