Enhancing energy harvest in a constructal solar collector by using alumina-water as nanofluid

Ojeda, Jorge A.; Messina, Sarah

doi:10.1016/j.solener.2017.03.054

Cited by 18 publications

(3 citation statements)

References 30 publications

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“…In many studies, Al 2 O 3 /water nanofluid was used in different systems. Al 2 O 3 /water nanofluid provided better thermal performance on the systems used in these studies (Huang et al , 2015; Pan et al , 2016; Ojeda and Messina, 2017; Kannaiyan et al , 2017; Tiara et al , 2017; Hady et al , 2017).…”

Section: Introductionmentioning

confidence: 87%

Experimental and numerical investigations of thermal performance of Al₂O₃/water nanofluid for a combi boiler with double heat exchangers

Özdemir

Ergun

2018

HFF

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Purpose This study aims to focus on usage of Al2O3/water nanofluid as working fluid in a combi boiler. The plate heat exchanger located at the bottom of the combi boiler has been used for heating the domestic water in the present study. Al2O3/water nanofluid has also been used in obtaining of the heat energy provided from combustion. Therefore, thermal performance of Al2O3/water has been determined by comparing water and nanofluid-water mixture. The present study also investigates heat transfer rates as numerical and experimental for varying cold side outlet temperatures, comparatively. Design/methodology/approach The present study has included both experimental and numerical methodologies. The experimental setup consists of main heat exchanger, atmospheric burner, circulation pump and plate-type heat exchanger in which the Al2O3/water nanofluid was used as working fluid to heat the domestic water. In the numerical part of the study, a commercial computational fluid dynamic code has been used to model heat rate and thermal efficiency of the heat exchanger used. Findings It has been concluded that the predicted results are in satisfactorily good agreement with the measured data. In the experimental part of the study, the flow rate of Al2O3/water nanofluid was kept constant during the experiments. The flow rates of the water by which the heated Al2O3/water nanofluid mixture was cooled via the plate heat exchanger have been changed as 3, 4, 5 and 6 lpm. The domestic water temperatures that were kept constant have also been changed as 40°C, 45°C, 50°C, 55°C and 60°C. It has been concluded that the Al2O3/water nanofluid thermal efficiency has been 16 per cent better than pure water. Originality/value The main originality of the present study is that thermal efficiency of the plate-type heat exchanger when Al2O3/water mixture nanofluids are used as there are limited studies related to the usage of Al2O3/water mixture nanofluids in the plate-type heat exchanger not only experimental but also numerical methodologies.

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Section: Introductionmentioning

confidence: 87%

Experimental and numerical investigations of thermal performance of Al₂O₃/water nanofluid for a combi boiler with double heat exchangers

Özdemir

Ergun

2018

HFF

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“…Ojeda和Méndez [65] 建立了平板太阳能集热器的瞬态模型, 构形优化后得到了最小的集热器吸热时间和最佳吸热板宽度. Ojeda和Messina [66] 研究了纳米流体为工质的太阳能集热器传热性能, 得到了热阻最小 ), 可近似认为吸热板上的热流方向垂直于换热管, 因此该导热过程可简化为一维问题来分析, 其导热微分方程如下:…”

Section: 构形理论也被引入到太阳能集热器的性能优化研unclassified

Constructal design for flat plate collector in a solar ocean thermal energy conversion system

Shi¹,

Feng²,

Chen³

et al. 2021

Sci. Sin.-Tech.

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“…Its use in the field of renewable and sustainable energy technologies allows for creating high-efficient and more economic systems. In this regard, many research studies [1][2][3][4][5][6][7][8] have evaluated, theoretically and experimentally, the increase in performance in heat transfer applications and solar thermal systems associated with the use of alumina-water as working fluid.…”

Section: Introductionmentioning

confidence: 99%

Aqueous Theta-Phase Aluminum Oxide Nanofluid for Energy Applications: Experimental Study on Thermal Conductivity

Zacarías,

de Vega,

García-Hernando

et al. 2024

Applied Sciences

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The use of nanofluids in energy systems allows for increasing efficiency and developing more economic systems. Alumina-water is one of the most common nanofluids used but little information is available about the aqueous theta-phase aluminum oxide. Given the lack of thermal conductivity data for this nanofluid, in this research, this property is experimentally evaluated. Nanofluid is prepared using the two-step method, employing a magnetic stirrer and a sonication bath. A high-precision sensor is employed for measuring thermal conductivity, using the method of transient hot wire. The thermal conductivity measurements for the base fluid (water) are compared with data provided by NIST. Nanoparticle mass fraction in the nanofluid is increased from 1 to 10% and the temperature from 22.1 to 59.3 °C. Three sonication times (1.5, 4 and 16.5 h) are used. A strong dependence between the thermal conductivity and the temperature and nanoparticles concentration has been found, while the sonication time has a negligible influence on the thermal conductivity in the range of times tested. A correlation to obtain the thermal conductivity of the water-based nanofluid using theta-phase aluminum oxide has been developed, including nanoparticle volume concentration and temperature. An excellent agreement is obtained between predicted and experimental data.

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Enhancing energy harvest in a constructal solar collector by using alumina-water as nanofluid

Cited by 18 publications

References 30 publications

Experimental and numerical investigations of thermal performance of Al₂O₃/water nanofluid for a combi boiler with double heat exchangers

Experimental and numerical investigations of thermal performance of Al₂O₃/water nanofluid for a combi boiler with double heat exchangers

Constructal design for flat plate collector in a solar ocean thermal energy conversion system

Aqueous Theta-Phase Aluminum Oxide Nanofluid for Energy Applications: Experimental Study on Thermal Conductivity

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Enhancing energy harvest in a constructal solar collector by using alumina-water as nanofluid

Cited by 18 publications

References 30 publications

Experimental and numerical investigations of thermal performance of Al2O3/water nanofluid for a combi boiler with double heat exchangers

Experimental and numerical investigations of thermal performance of Al2O3/water nanofluid for a combi boiler with double heat exchangers

Constructal design for flat plate collector in a solar ocean thermal energy conversion system

Aqueous Theta-Phase Aluminum Oxide Nanofluid for Energy Applications: Experimental Study on Thermal Conductivity

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Product

Resources

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Experimental and numerical investigations of thermal performance of Al₂O₃/water nanofluid for a combi boiler with double heat exchangers

Experimental and numerical investigations of thermal performance of Al₂O₃/water nanofluid for a combi boiler with double heat exchangers