Abstract
In the present study, the modified evacuated tube solar collector (METSC) with a bypass pipe utilizing copper oxide/distilled water (Cu2O/DW) nanofluid is experimented. Then, the performance of METSC was predicted through Artificial Neural Networks (ANNs) techniques. The input variables were different volumes of the storage tank from 5 to 8 l, various diameters of the bypass pipe from 6 to 10 mm, and various volumetric concentration of the nanofluid from 0 to 0.04. Also, the output variables were the temperature difference of fluid in 1-h period and the energetic efficiency of METSC. The results demonstrated that the METSC performance was mostly impacted by the tank volume alteration. Moreover, the optimum bypass tube diameter value was obtained, and it was denoted that using the Cu2O/DW nanofluid enhances the daily energy efficiency of METSC up to 4%. Furthermore, it was shown that both MLP and RBF techniques are two reliable algorithms to predict the thermal characteristics of an METSC. The maximum amounts of mean relative percentage error for MLP and RBF algorithms were reported as 0.576 and 0.907, respectively. Hence, two mathematical models were reported for formulating the output variables in terms of the input variables using the MLP technique.
Highlights
With the fast progress of near zero energy buildings implementations (Hamburg et al, 2020; Lidberg et al, 2019), the energy need associated to space heating and cooling is progressively decreasing (Lopez-Ochoa et al, 2019; Ma et al, 2020), thanks to both passive and active solutions (Rosso et al, 2014) and renewables integration (Cabeza et al, 2018; Sadeghi and Nazari, 2021)
The results demonstrated that this approach can raise the energy efficiency of Evacuated tube solar collectors (ETSCs) up to 11%
The effects of applying Cu2O/DW nanofluid on the maximum hourly fluid temperature difference inside the modified evacuated tube solar collector (METSC), and its thermal performance are surveyed through experiments
Summary
With the fast progress of near zero energy buildings implementations (Hamburg et al, 2020; Lidberg et al, 2019), the energy need associated to space heating and cooling is progressively decreasing (Lopez-Ochoa et al, 2019; Ma et al, 2020), thanks to both passive and active solutions (Rosso et al, 2014) and renewables integration (Cabeza et al, 2018; Sadeghi and Nazari, 2021). Hot water production requires an important energy demand factor in mild climates and in high performance new constructions and retrofits (Pigliautile et al, 2019). Heating water needs energy; finding novel approaches in harvesting energy, is very important for water heaters. Evacuated tube solar collectors (ETSCs) are nowadays very popular in solar energy-driven world for supplying household hot water (Sabiha et al, 2015; Sadeghi et al, 2020d)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
