Optimisation of thermo-optical properties of SiO2/Ag–CuO nanofluid for direct absorption solar collectors

Joseph, Albin; Sreekumar, Sreehari; Kumar, C.S. Sujith; Thomas, Shijo

doi:10.1016/j.molliq.2019.111986

Cited by 44 publications

(16 citation statements)

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“…[35] It has been proved by some effective principles that metal oxide nanocomposites have excellent light absorption ability. [36] In the present study, Joseph et al [37] investigated photothermal and thermal conductivity research of SiO 2 /Ag-CuO nanofluid. Jin et al [38] studied the Fe 3 O 4 , Cu and Au hybrid nanofluids which characterized to heighten the optical property in DASCs.…”

Section: Introductionmentioning

confidence: 89%

Preparation and Photothermal Conversion of h‐BN/CuO Nanofluids

Liu

et al. 2021

ChemistrySelect

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A new h-BN/CuO nanocomposite was prepared by using boron nitride (h-BN) and CuSO 4 ⋅ 5H 2 O as raw materials via hydrothermal synthesis. We studied loading the CuO nanoparticles on sheet of h-BN substrate and the stability of the h-BN/CuO water-based (h-BN/CuO) nanofluids. It had both well light absorbing ability and photothermal conversion efficiency in direct absorption solar collectors (DASCs). The results show that different molar ratios of CuO to h-BN do not affect the size of CuO nanoparticles or h-BN substrates, but within a suitable feed ratio range, there exists an optimum feed ratio: h-BN/CuO 0.75 : 1 which the suspension stability is the best in the base fluid. Simultaneously, supporting CuO nanoparticles on h-BN substrate can make the absorption capacity of sunlight stronger than that of pure h-BN. Under the simulated sunlight source, the nanocomposite with feed ratio of 0.75 : 1 was selected for the photothermal conversion test. The highest photothermal temperature of 0.05 wt % h-BN/CuO nanofluid can reach 92.21 °C, which is 37.58 °C higher than pure water at most. Meanwhile, compared with 35.35 % for pure water, its photothermal conversion efficiency can rise to 80.18 %.

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Section: Introductionmentioning

confidence: 89%

Preparation and Photothermal Conversion of h‐BN/CuO Nanofluids

Liu

et al. 2021

ChemistrySelect

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“…[69] 2015 Al2O3-H2O The collector productivity was increased more than pure water for all four concentrations of the nanofluid. [70] 2019 SiO2 / Ag-CuO The stability of nanofluids vigorously influenced the optical and thermal properties of the nanofluid.…”

Section: Materials and Methods Utilization Of Nanofluids In Solar Collementioning

confidence: 99%

Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Ünvar

Menlik

2021

Politeknik Dergisi

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The importance of using solar energy, one of the renewable energy sources, has started to be understood more recently. The negative environmental effects and limited amounts of fossil fuels have led to increased demand for renewable energy sources worldwide and the production of various models and devices has accelerated to take advantage of solar energy, which is the basis of all energy sources. Using solar collectors as a way to benefit from solar energy has been used for many years. Although solar collectors are generally divided into 4 types as flat plate (FPSC), evacuated tube (ETSC), parabolic (PSC) and heat pipe (HPSC), these types can also be divided into separate types with many different features. The most commonly used solar collector type in the world is Flat Plate Solar Collector. The most important reasons for this are being cheap, easily produced and applied in various ways. Yet, the thermal productivity of FPSCs decreases below 40% in non-ideal climate conditions with low surrounding temperature. The existence of such disadvantages of FPSCs led to the production of Evacuated Tube Solar Collectors. With the advancing technology, the utilization of heat pipes in collectors has come to the agenda and as a result of the studies conducted, it has been determined that the use of heat pipe improves efficiency. In addition, the use of nanofluids in solar collectors and heat pipes has become quite common, and many studies have been carried out especially on this subject recently. The primary objective is always to improve the performance of the system and achieve efficiency. In this way, solar energy will be used in the most effective way and world energy supply demand will be met by using renewable resources.

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“…The hybrid boron nitride (BN) and carbon black (CB) nanofluids were investigated by Hazra et al 28 They reported that BN-CB nanofluids at the concentration of 90 ppm/15 ppm enhanced the collector efficiency by 34.55%. Some other hybrid nanofluids such as ZnO-Au, 40 Al 2 O 3 /Co 3 O 4, 41 SiO 2 /Ag-CuO, 42 and Ag-Al 2 O 3 43 have also been proposed for DASC applications. The literature review above indicates that noble metals show the LSPR effect, and the hybrid nanofluids containing noble metals present excellent light absorption ability.…”

Section: Introductionmentioning

confidence: 99%

“…The hybrid boron nitride (BN) and carbon black (CB) nanofluids were investigated by Hazra et al 28 They reported that BN‐CB nanofluids at the concentration of 90 ppm/15 ppm enhanced the collector efficiency by 34.55%. Some other hybrid nanofluids such as ZnO‐Au, 40 Al 2 O 3 /Co 3 O 4, 41 SiO 2 /Ag‐CuO, 42 and Ag‐Al 2 O 3 43 have also been proposed for DASC applications.…”

Section: Introductionmentioning

confidence: 99%

Photo‐thermal conversion performance of mono MWCNT and hybrid MWCNT‐TiN nanofluids in direct absorption solar collectors

Zheng

Yan

Long

et al. 2022

Intl J of Energy Research

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Summary Solar energy is being widely investigated due to its abundant, renewable, and clean features. Photo‐thermal conversion in solar collectors is a direct approach for harvesting solar energy. Compared to the commonly used surface‐based solar collectors (SSCs), nanofluid‐based direct absorption solar collectors (DASCs) are more efficient. In this work, water‐based mono MWCNT and hybrid MWCNT‐TiN nanofluids were prepared through a two‐step method, aiming at light absorption enhancement of nanofluids for applications in DASCs. The optical and photo‐thermal conversion performance of the MWCNT nanofluids was firstly evaluated. The results showed that the MWCNT nanofluids presented high solar absorption capability, and the highest photo‐thermal conversion efficiency was obtained at 10 ppm. The TiN nanoparticles were subsequently incorporated to form the hybrid MWCNT‐TiN nanofluids. The absorption performance of the hybrid nanofluids was further enhanced. The highest efficiency of the hybrid MWCNT‐TiN nanofluids was achieved at the TiN mass fraction of 10 ppm, which was about 6.9%, 6.0%, and 3.8% higher than that of the MWCNT nanofluid at 2000, 4000, and 6000 seconds due to the localized surface plasmon resonance (LSPR) effect of TiN nanoparticles. It was also found that the collector efficiency dropped rapidly with the prolonged irradiation time owing to the convection and radiation heat loss at the elevated temperature. Therefore, effective measures should also be taken to reduce heat loss to maintain high photo‐thermal conversion efficiency.

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Optimisation of thermo-optical properties of SiO2/Ag–CuO nanofluid for direct absorption solar collectors

Cited by 44 publications

References 48 publications

Preparation and Photothermal Conversion of h‐BN/CuO Nanofluids

Preparation and Photothermal Conversion of h‐BN/CuO Nanofluids

Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Photo‐thermal conversion performance of mono MWCNT and hybrid MWCNT‐TiN nanofluids in direct absorption solar collectors

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