Experimental study on heat transfer performance of solar thermoelectric generators using mwcnt-distilled water and gnp-distilled water nanofluids as coolants
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Tarih
2023
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info:eu-repo/semantics/openAccess
Özet
The solar thermoelectric generators (STEGs) have emerged during the past decade as a promising substitutional among other green power production systems. A solar thermoelectric generator (STEG) is a system that can generate electrical energy directly from solar energy without any intermediate energy forms such as work in the traditional power generation systems. Recent developments in solar thermoelectric generator have achieved several improvements as a result of its optimized systems such as concentrated systems and also the boosts from nanotechnology. In this study, a concentrator thermoelectric generator (CTEG) using Graphene Nanoplatelets (GNPs), and Multiwall Carbon Nanotubes (MWCNTs) dispersed in distilled water as base fluid was investigated experimentally. The CTEG system was designed, constructed in Karabük University Energy Systems labs, Turkey and have been commissioned outdoor by testing, balancing and adjusting. Experiments were performed for 0.25 wt.% nanoparticle mass concentration of MWCNTs-distilled water and GNPs-distilled water nanofluids with a constant volume rate of flow (? ?=0.5 L/min). Experiments study aimed to study effect of nanoparticle types on thermal and electrical energetic efficiency. The obtained results showed that the CTEG is enable to generate (Emax=3.7 W) of electrical power output for an average temperature difference of 38°C. MWCNTs-distilled water nanofluid presented an enhancement in electrical performance more than GNPs-distilled water nanofluid and distilled water, while GNPs-distilled water nanofluid presented maximum thermal increment. The total efficiency for the day-long periods were 16.34%, 24.03% and 20.21% for distilled water, GNPs-distilled water, MWCNTs-distilled water respectively. The results of the study made a solid basics about the prospects of CTEG applications related with nanotechnology to be one of the potential choices for cooling technique by using different types of nanofluids as coolants.
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Politeknik Dergisi
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26
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4
