Energy analysis of a solar air collector with rows of fins

Moummi, Noureddine; Youcef-Ali, S.; Moummi, Abdelhafid; Desmons, J.Y.

doi:10.1016/j.renene.2003.11.006

Cited by 137 publications

(51 citation statements)

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“…For mass flow rate of 0.035 kg/s, it is observed that the air temperature increasing along the air stream dynamics length with a mean of (316.3 K) in the smooth case and with an average of (324.3 K, 329.5 K, 330.7 K and 332.1 K) in the case (without inclined part, 0°, 45° and 60°) with a rise of (2.52%, 4.17%, 4.55% and 4.99%)respectively. This is due to the secondary flow when it is trapped between two chicanes and the main flow where powered with a brewing phenomenon which provokes a heat transfer from the hot flow to the cold one, therefore the chicanes provide a delaying aspect for more and more time to the heat transfer process which is confirmed by Moummi et al [4][5][6][7][8][9][10][11][12][13]. …”

Section: Reynolds Number Effect On the Heat Transfer Coefficientmentioning

confidence: 98%

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The Air Solar Collectors: Introduction of Chicanes to Favour the Heat Transfer and Temperature in the Air Stream Dynamics

Mahfoud

Moummi

2015

MATEC Web of Conferences

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Abstract.The thermal performance of a single pass solar air heater with chicanes attached was investigated numerically using a 2D model of solar air stream dynamics collectors where the turbulence standard − model has been implemented. The chicane is formed with two parts: the first is perpendicular to the air flow and the second part is titled (α), they are mounted in successive rows, oriented perpendicular to the air flow and soldered to the back plate. The predicted results are validated by comparing with the literatures semi-empirical and experimental data and shown a reasonable agreement. Effects of relevant parameters as the (Reynolds number, chicanes upper parts tilts angles and air mass flow rates) on the heat transfer coefficient and temperature development are discussed. It is apparent that the turbulence created by the chicanes resulting in greater increase in heat transfer inside the air stream dynamics.

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Section: Reynolds Number Effect On the Heat Transfer Coefficientmentioning

confidence: 98%

“…There are different factors have been developed in literatures (Dipprey and Sabersky [2], Menasria et al [3], Moummi et al [4]). The presence of laminar sub-layer between the absorber plate and flowing air is generally considered to be the main cause of thermal resistance for heat transfer.…”

Section: Introductionmentioning

confidence: 99%

The Air Solar Collectors: Introduction of Chicanes to Favour the Heat Transfer and Temperature in the Air Stream Dynamics

Mahfoud

Moummi

2015

MATEC Web of Conferences

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“…We describe the heat transfer between the fluid and the absorber by a local heat coefficient hx, the heat flux by convection from the absorber-plate to this fluid element is given as [2,5]:…”

Section: Experimental Analysismentioning

confidence: 99%

“…We have used the correlation of Kays [5], valid for collector without fins and whose choice is justified by the fact that this correlation extends on all the fields from the Reynolds number, to calculate the Nusselt number. The results obtained are compared with the average results obtained from the experiments undertaken in the case of both SAH models.…”

Section: Variation Of the Nusselt Numbermentioning

confidence: 99%

“…Heat transfer augmentation techniques have been extensively developed to improve the thermal performance of heat exchanger systems with a view to reducing the size and cost of the systems, the technique has been widely applied in many engineering applications [4]. These techniques was studied for the evaluation of the convective heat coefficient along the air channel duct with different forms of plate fins inserted in the flow channel duct of the SAHs, allowing a complete representation of the temperatures profile of the absorber [5,6].…”

Section: Introductionmentioning

confidence: 99%

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EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

Labed¹,

Moummi²,

Benchabane³

et al. 2015

IJHT

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This paper presents an experimental comparative study on the thermal performance and heat exchange of two single pass solar air heaters models (SAHs); we have proceeded to reversing the flow direction in the solar air heater. Initially, to determine the best performing model and to improve the efficiency factor of the SAH. Secondly, to evaluate the convective heat transfer coefficient of both models, named: N-1 and N-2. The indices (1) and (2) indicate, respectively, that the air was blown up or blown down in the channel duct of the SAH. Therefore, we have compared between the efficiencies, the convective heat transfer coefficient, Nusselt number curves and the distribution of air temperatures in the channel ducts of both solar air heaters. Both collectors were designed, constructed and tested in the University of Biskra (Algeria) in a stand facing south at an inclination angle equal to the local latitude. The results show that N-2 model (air blown down) is more efficient than N-1 model (air blown up), and the improvements in the heat exchange due to this technological solution are about 10-20%.

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A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Chamarthi

Singh

2020

Intl J of Energy Research

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This review composition aimed to comprehensively present the experimental investigation procedures and thermal performance augmentation techniques of solar air heaters. Various testing standards such as static and dynamic tests, and performance parameters, such as, thermal, thermo-hydraulic, and exergy efficiencies, are incorporated to present the experimental investigation procedures. The present review work deals with testing conditions (indoor and outdoor), instrumentation, various parameters of interest with corresponding optimum values, their uncertainty levels together with SAH orientation, air flow type, thermal energy storage devices, duct modifications and heat transfer surfaces using fins, baffles, and ribs employed to enhance the thermal performance. The authors of this review work believed that the current composition constitutes a summary of details to quickly access the information for analyzing the various experimental investigation procedures and heat transfer augmentation techniques along with the optimum values of flow and geometric parameters. Moreover, economical and efficient solar air-heating systems with low pressure drop and high heat exchange to air are presented and reviewed.

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Energy analysis of a solar air collector with rows of fins

Cited by 137 publications

References 1 publication

The Air Solar Collectors: Introduction of Chicanes to Favour the Heat Transfer and Temperature in the Air Stream Dynamics

The Air Solar Collectors: Introduction of Chicanes to Favour the Heat Transfer and Temperature in the Air Stream Dynamics

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

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