Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Khalil, Wissam; Obaid, Zain Alabdeen Hussein; Dawood, H. K.

doi:10.1002/htj.21558

Cited by 22 publications

(13 citation statements)

References 24 publications

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“…The factors concerned with geographical location are the fraction of absorbed energy, the solar intensity, and the ambient weather conditions. The behavior of the exergy efficiency shown in Figures 11 and 12 is comparable only with the work conducted by Khalil et al 28 Table 2 presents representative studies of exergy efficiency for SAH with fins that used in different applications. When a comparison in terms of exergetic efficiency is held between the present work and the literature, it can be observed that exergetic efficiency values are accepted.…”

Section: Resultssupporting

confidence: 77%

“…In addition, a large amount of the exergy annihilation can be avoided in the glass cover. Experimental tests for an SAH with different fin arrangements on the absorber plate were conducted by Khalil et al 28 to evaluate exergetic performance. They found that an inclined staggered fin arrangement gives a higher value of exergy efficiency of around 77%.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of exergetic performance for a solar air heater with metal foam fins

2020

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In this experimental study, an exergetic analysis is presented for solar air heaters (SAHs) that have absorber plates equipped with different fin arrangements. The following two types of fins were used: solid fins (conventional) and metal foam fins. Longitudinal, staggered, and corrugated fin arrangements in SAHs were investigated under the weather conditions experienced in Baghdad, Iraq in February to April 2018. The exergy efficiency and exergy loss of the SAHs were evaluated for five air mass flow rates ranging from 0.011 to 0.059 kg/s. Based on the exergy analysis, SAHs with metal foam fins are more efficient than those with solid fins. In addition, corrugated metal foam fins introduce more turbulent flow than the other fin configurations. It was found that the exergy loss and the exergy efficiency were directly proportional to the values of solar irradiance and air mass flow rates. At solar noon, the maximum values for exergy change were 127 and 89 W/m2 for air mass flow rates of 0.011 and 0.059 kg/s, respectively.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Analysis of exergetic performance for a solar air heater with metal foam fins

2020

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“…For each measured variable, one or more elemental uncertainties can contribute to the total uncertainties for the variable. These elemental uncertainties were combined using the Root Mean Squared (RMS) rate method according to [20] and [21]. For the measured variables in the different experiments, the results for the elemental uncertainties are summarized in Table 2 & Table 3.…”

Section: Uncertainty Analysismentioning

confidence: 99%

Investigation of Physical and Numerical Model of Archimedes Screw Turbine

Abdullah¹,

Khalil²,

Kamel³

et al. 2020

JPEE

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Archimedes screw turbines have been developed as they work with a low head with high efficiency, where flow energy can be exploited in small rivers, streams, regulators and others. The power can be produced using Archimedes turbines and depends on some parameters including the number of blades, flow, and angle of the shaft inclination and the length of the pitch. A physical and numerical model has been developed to determine the performance of the Archimedes turbine on the Ramadi Dam in Iraq. The physical model was made of stainless steel with the following parameters (length 1000 mm, pitch 70 mm, diameter ratio 0.536, inclination angles 30˚, 35˚, 40˚, 45˚). Work was carried out on different flow rates and inclination angles. The experimental results showed that the highest efficiency was 81.4% at 35˚ inclination angle and a flow rate of 1.12 l/s; the maximum power of 9.03 watts was at a 45˚ inclination angle and a flow rate of 2.065 l/s and 72% efficiency. Also, the impact of the pitch and the number of blades were studied. The results show that torque is increase with an increase in the pitch length, and torque is decreased with increase in several blades. The numerical results showed that the using of two blades led to a greater power produced. The comparison of the numerical and experimental results showed a good agreement, also the comparison with the published data showed a good agreement. As a final result the Archimedes screw has many positive points making it a good potential candidate. The results that emerged show the possibility of using this type of turbine in the Euphrates River in Anbar Governorate-Iraq, as the province is characterized by the presence of many regulators on the river in which turbines can be employed.

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“…Khalil et al [11] studied the different arrangements of turbulators in SAH and showed the highest exergy efficiency for inclined staggered turbulators. Das et al [12] were compared the plain absorber with a sand coated absorbing surface of a SAH.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Augmentation of Concentrated Solar Absorber Using Modified Surface Contour

Senthil

Chezian

Arsath

2021

Int. j. eng. technol. innov.

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This work aims to compare the cavity surface contour’s thermal performance to that of the solar absorber’s plain surface contour for Scheffler type parabolic dish collectors. The absorber is tested for the temperature range up to 600°C without working fluid and 180°C with the working fluid. The modified absorber surface's thermal performance is compared with the flat surface absorber with and without heat transfer fluid. The peak temperature reached by the surface modified absorber (534°C) is about 8.6% more than that of the unmodified absorber (492°C) during an outdoor test without fluid. The energy efficiency of cavity surface absorber and plain surface absorber are 67.65% and 61.84%, respectively. The contoured cavity surface produces a more uniform temperature distribution and a higher heat absorption rate than the plain surface. The results are beneficial to the design of high-temperature solar absorbers for concentrated solar collectors.

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Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Cited by 22 publications

References 24 publications

Analysis of exergetic performance for a solar air heater with metal foam fins

Analysis of exergetic performance for a solar air heater with metal foam fins

Investigation of Physical and Numerical Model of Archimedes Screw Turbine

Heat Transfer Augmentation of Concentrated Solar Absorber Using Modified Surface Contour

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