Investigation on heat transfer enhancement of conventional and staggered fin solar air heater coated with CNT-black paint—an experimental approach

Bhaskaran, Madhu; Kabeel, A.E.; Sathyamurthy, Ravishankar; Sharshir, Swellam W.; Manokar, A. Muthu; Raghavendran, Pala Raviramachandran; Chandrashekar, Thimmaiah; Devarajan, Mageshbabu

doi:10.1007/s11356-019-07561-1

Cited by 12 publications

(5 citation statements)

References 42 publications

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“…The geometry allows a reduction in airflow demanded, 7-10 fold, and at the same time gains a higher efficiency, in comparison to smooth pipe absorber arrangement. Madhu et al (2020) coated the absorber of SAH with CNT-black paint and also introduced staggered fins. The coating effect enhanced the plate temperature from 95 °C to a maximum of 102 °C and the average daily efficiency improved by up to 98% at lower mass flow rates.…”

Section: Introductionmentioning

confidence: 99%

The effect of sinusoidal fins’ amplitude on the thermo-hydraulic performance of a solar air heater

Saboohi,

Ommi,

Rahmani

et al. 2022

Chemical Engineering Communications

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Solar energy exploitation is growing consistently, as it is the cheapest and most accessible amongst all forms of renewable energies. Increasing the performance of solar air heaters can aid in developing clean energy use and subsiding the greenhouse gas emissions from in the world. This study, therefore, seeks to improve the thermo-hydraulic performance of solar air heaters using sinusoidal extended surfaces. The results show that Reynolds number increment contributes to the enhancement of Nusselt number and thermo-hydraulic performance, while it does not affect the friction factor considerably. The highest value of the Nusselt number belongs to the case with the highest fin amplitude and wavy fins configuration by about 7 times higher value in comparison to the simple solar air heater. It is shown that the wavy configuration can render higher thermohydraulic performance than that of raccoon fins, by about 10 percent. The finned configurations feature better fluid flow mixing at the outlet and lower maximum and gradient of temperature on the absorber plate compared to those of simple and common solar air heaters.

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Section: Introductionmentioning

confidence: 99%

The effect of sinusoidal fins’ amplitude on the thermo-hydraulic performance of a solar air heater

Saboohi,

Ommi,

Rahmani

et al. 2022

Chemical Engineering Communications

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“…Mathematical model that was experimentally validated for square pyramid solar still has been addressed in El-Sebaii and Khallaf (2020). Madhu et al (2020) investigated the experimental enhancement of heat transfer through conventional and staggered fin solar air heater coated with CNTblack paint. For diesel engine exhaust emission control, Solomon et al (2019) addressed the development of electrochemical cells based on the electrochemical decomposition of NO x and oxidation of HC and CO emissions.…”

Section: Renewable Energy Sustainabilitymentioning

confidence: 99%

“…NO x emission has a serious effect on the environment, and it has to be controlled effectively. Madhu et al (2020) investigated the experimental enhancement of heat transfer through conventional and staggered fin solar air heater coated with CNT-black paint. Results revealed that the effect of coating improved the plate temperature to a maximum of 102°C while the modified solar air heater (SAH) coated with ordinary black paint and staggered fin arrangement is found as 95°C for the flow rate of m f = 0.03 kg/s.…”

Section: Renewable Energy Sustainabilitymentioning

confidence: 99%

Renewable energy and water sustainability: lessons learnt from TUISR19

Masoud

2020

Environ Sci Pollut Res

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“…Other researchers focused on reducing energy losses by mixing nanoparticles with black paint to improve the absorptivity of solar radiation [15] or by using different insulation materials [16].…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of a Counter-Flow Double-Pass Solar Air Heater With The Steady and Pulsating Flow

Hussein¹,

Ahmed²,

Ekaid³

2022

ETJ

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 The tubular solar absorber is placed perpendicularly to the direction of airflow.  Pulsating flow increases the thermal performance by up to 15.2%  Thermal performance is directly proportional to the pulsating frequency.The present work studied the influence of pulsating flow as an active method on the thermal performance of a double-pass solar air heater with a tubular solar absorber. A ball valve has been used as a pulse generator mounted at the downstream flow of the solar air heater. The experiments were under indoor conditions with a constant heat flux of 1000 W/m 2 , and different air mass flow rates ranged from 0.01 to 0.03 kg/s. Moreover, the study covered three pulsation frequencies varied from 1 to 3 Hz. Based on the experimental outcomes, it can be observed that the heat transfer rate is enhanced by applying the pulsating flow, where it was found that the outlet temperature in the case of applying the pulsating flow rises by about 25.6 -27% as compared with the steady flow case. Moreover, pulsating flow offers a higher effective thermal performance by about 15.2 % at the maximum air mass flow rate compared with the steady flow. In addition, the findings pointed out that varying the pulsation frequency from 1 to 3 Hz produces an enhancement in heat transfer rate and in solar heater effective efficiency, where it was found that when changing the frequency from 1 to 3, the increment of effective efficiency ranged from 3.8 to 6.9 % depending on the air mass flow value.

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Investigation on heat transfer enhancement of conventional and staggered fin solar air heater coated with CNT-black paint—an experimental approach

Cited by 12 publications

References 42 publications

The effect of sinusoidal fins’ amplitude on the thermo-hydraulic performance of a solar air heater

The effect of sinusoidal fins’ amplitude on the thermo-hydraulic performance of a solar air heater

Renewable energy and water sustainability: lessons learnt from TUISR19

Thermal Performance of a Counter-Flow Double-Pass Solar Air Heater With The Steady and Pulsating Flow

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