Energy and exergy analysis of a flat-plate solar air heater coated with carbon nanotubes and cupric oxide nanoparticles embedded in black paint

Abdelkader, Tarek Kh.; Zhang, Yanlin; Gaballah, Eid S.; Wan, Qiang; Fan, Qizhou

doi:10.1016/j.jclepro.2019.119501

Cited by 80 publications

(21 citation statements)

References 31 publications

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“…As suggested by International Energy Agency (IEA) Task 27 report on solar heating and cooling [24]. The optical and morphological characterization of the new coatings have been discussed in detail in our previous study [11]. Briefly, the results showed that 4% CNTs/CuO-black paint was the best composite with solar absorptance and thermal emittance reaching 0.964 and 0.124, respectively, with the highest solar selectivity as illustrated in Figure 1.…”

Section: Coating Preparationmentioning

confidence: 85%

“…In brief, the RSAH with CCu-BP exhibited the highest increment of exergy efficiency (51.6%) under an airflow rate of 0.0244 m 3 /s (condition C) compared to the SSAH with the same coating. Since, in the case of condition C (Re = 2850), which lay in the transition region, from the laminar to turbulent flow showed a decline in exergy performance in this region (this behavior was noted in [11,30]). In the current study, the decline was much more for the SSAH, but for RSAH, the declination was lower because of the increase in turbulent intensity with the steady effect of the lost energy due to the increased flow rate of air.…”

Section: Exergy Efficiency (%) and Improvement Potentials (W) For Rsamentioning

confidence: 86%

“…The comparison of the averaged thermal efficiencies of RSAH under airflow condition C for several days is tabulated in Table 4. As illustrated in Equations (5)- (11), thermal efficiency is a function of many parameters such as solar radiation, working fluid temperature differences, heat removal factor, and overall losses coefficient. Consequently, thermal efficiency is massively affected by any variation of those variables.…”

Section: Useful Energy (W) Thermal Efficiency (%) and Nusselt Numbementioning

confidence: 99%

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Energy and Exergy Analysis of a Flat-Plate Solar Air Heater Artificially Roughened and Coated with a Novel Solar Selective Coating

et al. 2020

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Enhancements in heat transfer, and consequently the thermohydraulic performance of solar air heaters (SAHs), are necessary to widen and optimize their use in many applications such as solar drying or heating buildings. In this investigation, two techniques were used. A novel solar selective coating combined with broken arc ribs roughness was employed with a SAH and the evaluation of the energetic and exergetic performance was applied under four airflow working conditions compared to a smooth absorber SAH coated with the same coating. The results revealed that the Nusselt number of roughened SAH with the new coating exhibited a notable improvement compared to a smooth absorber SAH and a roughened SAH without a coating. Furthermore, the thermal efficiency increased with the increase in the air flow rate and the maximum rise was 18.8% compared to a smooth SAH. The highest increase in exergy was 51.6% with minimum values of exergy destruction and improvement potentials. In brief, the roughened SAH with 4% CNTs/CuO-black paint under the airflow rate of 0.0244 m3/s (condition C) exhibited the best energetic and exergetic performance.

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Section: Coating Preparationmentioning

confidence: 85%

Section: Exergy Efficiency (%) and Improvement Potentials (W) For Rsamentioning

confidence: 86%

Section: Useful Energy (W) Thermal Efficiency (%) and Nusselt Numbementioning

confidence: 99%

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Energy and Exergy Analysis of a Flat-Plate Solar Air Heater Artificially Roughened and Coated with a Novel Solar Selective Coating

et al. 2020

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“…The largest irreversibility was occurring at the SAH without obstacles (Type IV) collector in which collector efficiency is smallest. While, Abdelkader et al [2] gives energy and exergy analysis of a flat-plate solar air heater coated with carbon nanotubes and cupric oxide nanoparticles embedded in black paint, the obtained outcomes display that energy efficiency enhanced by approximately 24.4%. The difference between outlet and inlet temperatures of the air across SAH rises up to 22% based on averaged values.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Energy and Exergy for the Flat Plate Solar Air Collector with Longitudinal Fins Embedded in Paraffin Wax Located in Baghdad Center

Abdulmunem¹,

Jabal²,

Samin³

et al. 2019

IJHT

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Latent heat of the fusion for the Phase changeable materials (PCM) can be utilized as heat energy store, and this energy can be employed in different applications. In present experimental work, effect of using the embedded longitudinal fins within the paraffin wax, on the energy and exergy performance for the solar air collector was investigated under the Baghdad governorate climate. Compared with the collector without paraffin wax, the results indicated that using of paraffin wax as a thermal storage material reduces the losses of energy and exergy of the collector, high levels of heat reduction by using PCM/Fins were about 33 and 40% respectively at the peak heat charging time (12:30 PM), while the decreasing in energy and exergy losses of the collector with PCM only was about 24 and 30% respectively at the same time of charging (12:30 PM). Due to the going of sum heat to store in the paraffin wax at the charging heat time, the energy along with exergy heat gains, while efficiencies were decreased with and without fins, this decreasing in the heat was the most by using PCM/Fins and it was around 30 and 44%, respectively for energy and exergy efficiencies, while it was about 20 and 31% by using PCM only at the same time of testing. The benefit of using embedded longitudinal fins in PCM is to enhance the thermal storage efficiency by about 6% compared with the solar collector that uses PCM only. Keywords:solar collector, PCM, fins, energy, exergy, efficiency the results indicated that using inner longitudinal fins led to accelerate melting of PCM (paraffin wax). While, Lin [7] was

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“…3, pp. 447-467, March, 2021455The overall heat coefficients U is the sum of top loss, bottom and edge loss coefficients, represented by the fallowing equation,The top loss coefficients U of the glass plate is calculated by the formula[47],[48]…”

mentioning

confidence: 99%

Exergetic and Energetic Evaluation of an Innovative Solar Air Heating System Coated With Graphene and Copper Oxide Nano-Particles

Kumar

Verma

2021

Journal of Thermal Engineering

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In the 21 th century, renewable energy has to play very important role in socioeconomic and industrial development. This paper evaluates the exergy-energy analysis, which is based on the second law of thermodynamics. The triangular solar heater is developed to determine the heat transfer rate, thermal efficiency, exergy efficiency and Bejan number. In addition, we have examined the effects of entropy generation with respect to solar radiation and ambient temperature of air. Absorber plates coated with graphene and copper oxide nano-particles by the different percentages (0.1%, 0.2%, 0.3% & 0.4%) doped into black paint which increases the absorption of heat. The Reynolds number (4500 ≤ ≤ 22700) varies for the fixed selective coating on absorber plate and mass flow rate. The experimental observations were performed for constant mass flow rate of air ranging from 0.0035kg/s to 0.018 kg/s. The experimental result gives the average thermal efficiency enhancement of 3.58% for 0.3% graphene/CuO-black paint. Entropy generation is more for 0.1% and minimum for 0.3% graphene/CuO-black paint coating. The entropy generation analysis concludes that the entropy generation increases with increasing the mass flow rate. Exergy efficiency enhancement can be found 0.169%for 0.3% with respect to 0.1% graphene/CuO-black paint.

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Energy and exergy analysis of a flat-plate solar air heater coated with carbon nanotubes and cupric oxide nanoparticles embedded in black paint

Cited by 80 publications

References 31 publications

Energy and Exergy Analysis of a Flat-Plate Solar Air Heater Artificially Roughened and Coated with a Novel Solar Selective Coating

Energy and Exergy Analysis of a Flat-Plate Solar Air Heater Artificially Roughened and Coated with a Novel Solar Selective Coating

Analysis of Energy and Exergy for the Flat Plate Solar Air Collector with Longitudinal Fins Embedded in Paraffin Wax Located in Baghdad Center

Exergetic and Energetic Evaluation of an Innovative Solar Air Heating System Coated With Graphene and Copper Oxide Nano-Particles

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