Thermal performance enhancement of an evacuated tube solar collector using graphene nanoplatelets nanofluid

Soudeh Iranmanesh, Hwai Chyuan Ong, Bee Chin Ang, Emad Sadeghinezhad, Alireza Esmaeilzadeh, Mohammad Mehrali*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

152 Citations (Scopus)


In this study, the effect of graphene nanoplatelets (GNP)/distilled water nanofluid on the thermal performance of evacuated tube solar collector (ETSC) water heater was experimentally investigated. The mass percentage of GNP was considered at 0.025, 0.5, 0.075 and 0.1 wt%. The physical and thermal properties of the GNP nanofluids including stability, specific heat capacity, viscosity and thermal conductivity were investigated. The thermal efficiency tests on the solar collector were carried out for varying volumetric flow rate of 0.5, 0.1, and 1.5 L/min while the ASHRAE standard 93–2003 was considered to calculate the efficiency of the collector. The results indicated that the solar collector thermal efficiency gave enhancement up to 90.7% at a flow rate of 1.5 L/min when the GNP nanofluid was used as an absorption medium. The results indicated that by increasing the mass percentage of nanoparticles, thermal energy gain also increases, reaching a higher outlet temperature of the fluid when graphene nanosheets are used.

Original languageEnglish
Pages (from-to)121-129
Number of pages9
JournalJournal of cleaner production
Early online date29 May 2017
Publication statusPublished - 20 Sept 2017
Externally publishedYes


  • Evacuated tube solar collector
  • Graphene nanoplatelets
  • Nanofluid
  • Thermal efficiency
  • Thermo-physical properties


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