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Research articles

ScienceAsia 50 (2024):ID 2024017 1-6 |doi: 10.2306/scienceasia1513-1874.2024.017

Investigation on sensitivity of photo-thermal conversion efficiency of an enclosed type evacuated U-tube solar collector using Fe3O4-MWCNT/water hybrid nanofluid

Shifeng Wanga, Yijie Tongb,*

ABSTRACT:     The thermal performance of an enclosed type evacuated U-tube solar collector (EEUSC) was investigated experimentally using Fe3O4 -multi-walled carbon nanotube (MWCNT)/water hybrid nanofluid with various proportions of Fe3O4 and MWCNT nanoparticles. The sensitivity of thermal performance and photo-thermal conversion efficiency was analyzed under different operating conditions. The maximum efficiency of the EEUSC was 80.1% when hybrid nanofluid with 80 wt% MWCNT and 20 wt% Fe3O4 nanoparticles (weight ratio = 8 : 2) was applied, which corresponded to 15.5% and 25.6% improvement compared to Fe3O4 nanofluid and water, respectively. In addition, the efficiency of EEUSC was increased by 10.1% when the flow rate of the working fluid was increased from 0.036 kg/s to 0.054 kg/s. The experimental results demonstrated that adding MWCNT nanoparticles into Fe3O4 nanofluid was an effective way to enhance the sensitivity of thermal performance of the EEUSC.

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a Institute of Academic Research, Hangzhou Vocational and Technical College, Hangzhou 310018 China
b Fair Friend Institute of Intelligent Manufacturing, Hangzhou Vocational and Technical College, Hangzhou 310018 China

* Corresponding author, E-mail:

Received 20 Mar 2023, Accepted 18 Dec 2023