Thermal and exergetic investigation of a solar dish collector operating with mono and hybrid nanofluids

Abstract

The use of solar dish thermal collectors is a promising choice for designing sustainable energy systems. The use of nanofluids is a new way for enhancing the thermal performance of solar collectors because of their improved thermal properties. The objective of this study is to investigate the use of mono and hybrid nanofluids in a solar dish collector in order to determine which kind of nanofluids leads to higher performance enhancements. The analysis is conducted with a developed thermal model in Engineering Equation Solver and the collector is studied thermally and exergetically. The examined hybrid nanofluid has as base fluid syltherm 800 with 1% Cu and 1% TiO 2. Moreover, the examined mono nanofluids are the syltherm 800 with 2% Cu and syltherm 800 with 2% TiO 2. The investigated solar dish collector has a spiral absorber and it is examined for inlet temperatures from 25 °C up to 300 °C with a flow rate of 200 L/h. According to the final results, the use of hybrid nanofluid leads to higher thermal efficiency enhancement compared to the mono nanofluids because of the higher increase in the Nusselt number in the flow. More specifically, the use of the hybrid nanofluids leads to 0.99% mean thermal efficiency enhancement compared to the pure oil case, while the use of Oil/Cu and Oil/TiO 2 lead to 0.42% and to 0.56% mean thermal efficiency enhancement, respectively. Moreover, the exergy efficiency is found enhanced with the use of all nanofluids. The mean exergy efficiency enhancement is 1.21% with the hybrid nanofluid, while it is 0.73% with Oil/TiO 2 and 0.53% with Oil/Cu.

Comparison of mathematical models to estimate the thermal conductivity of TiO2-water based nanofluid: A review

“…Pavlović et al [29] conducted sudy on TiO 2 based nanofluid and found that thermal conductivity increases with increasing temperature. Trend of increasing thermal conductivity of base fluid and nanofluid is approximately the same [30,31,32,33,34].…”

Efficiency enhancement of a solar dish collector operating with a novel soybean oil-based-MXene nanofluid and different cavity receivers

“…inclusion of 0.01 volume concentration) in comparison with the collectors integrated with base fluid as working fluid. Similarly, Pavlovic et al [29] have conducted an experimental work using Syltherm 800 oil as the base fluid and Cu/TiO2 nanoparticles as the additives in the synthesis of mono and hybrid nanofluids. This was done as a comparison study for the investigation of performance enhancement in a solar dish collector.…”

Performance analysis of solar assisted multigenerational system using therminol VP1 based nanofluids: A comparative study

“…Different experimental and numerical validated correlations have been assessed and compared. A numerical model of parabolic dish solar collector using two different nanofluids was developed and investigated from thermal and exergetic point of views [9]. The performance of PV/thermal solar collector was analysed by considering influence of lower and upper reflector and water based nanofluid [10].…”