Optimal aspect ratios for non-isothermal flat plate solar collectors for air heating

Bracamonte, Johane; Baritto, Miguel

doi:10.1016/j.solener.2013.09.007

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…Many workers have studied the optimisation of flat panel collectors. Bracamonte (2013) found that for solar air heaters, the optimal plate shape was a function of Mach number. Eisenmann (2004) optimised plate geometry in terms of metal content.…”

Section: Introductionmentioning

confidence: 99%

Design and Performance of Evacuated Solar Collector Microchannel Plates

Moss¹,

Shire²

2015

Proceedings of the EuroSun 2014 Conference

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Solar thermal collectors for buildings have traditionally used either a flat panel or evacuated tube design. A high vacuum (<1 Pa) can eliminate heat loss via gas conduction effects, thereby increasing efficiency in cold climates or in applications requiring elevated delivery temperatures e.g. for process heat. Combining the two established technologies, an evacuated flat panel design would be more architecturally elegant than tubular collectors and have a better fill factor, yet be thinner and more efficient than conventional flat panels. Beyond the efficiency gains from vacuum insulation, the collector design aims to limit temperature nonuniformity (with its increased radiative losses) by achieving homogeneous flow across micro-channels within the plate. A design methodology has been adopted that optimises the channel hydraulic diameter in terms of plate-to-fluid temperature difference and power required to pump the fluid. Two collectors (aluminium, stainless steel) have been designed and fabricated, with machined plates and laser-welded joints.

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Section: Introductionmentioning

confidence: 99%

Design and Performance of Evacuated Solar Collector Microchannel Plates

Moss¹,

Shire²

2015

Proceedings of the EuroSun 2014 Conference

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“…By proceeding the same way, substituting Eqs. (14) and (15) into Eq. (10), we have obtained the closed form solution.…”

Section: Solution Methodology With Differential Transformation Methodmentioning

confidence: 99%

“…Subiantoro and Tiow [14] have depicted analytical model for the prediction of heat loss from the top cover of single and double glazing flat plate solar collectors and the results have been compared with the 2-D CFD analysis. Bracamonte and Baritto [15] have developed a dimensional model of thermal behaviour of flat plate solar collector without glass cover by an entropy balance equation. Also this model was validated for a wide range of aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis on Variable Thickness Absorber Plate Fin in Flat-Plate Solar Collectors Using Differential Transform Method

Kundu

2020

Journal of Thermal Engineering

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This article highlights a parametric investigation of the thermal analysis of variable thickness flat plate solar collector. Triangular profile of an absorber plate has been adopted from the point of view of saving in material. An approximate analytical model based on the Taylor series of expansion has been implemented for finding out the temperature distribution in the heat conduction direction of the absorber plate. Differential transform method (DTM) has been used to establish a new analytical formulation. The Modified Bessel's function has been applied for the comparison of the results produced by DTM. The variation of several temperature dependent parameters is studied for knowing the dependency effect. The efficiency of absorber plate has been analysed as a function of Biot number and the impact of aspect ratio on the plate performance has been highlighted. The present analytical approach has ability to determine the thermal performance of an absorber plate under an actual design condition with a minor modification of the analysis. The formulation of the present work is also suitable for the analysis of any shape of an absorber plate in flat-plate solar collectors.

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“…Sharma et al [2] aimed to optimize analytically set of different operating parameters affecting smooth flat plate SAH which are glass cover number, plate emissivity, mean temperature, temperature rise, tilt angle and solar radiation intensity at different Reynolds number. Also, dimensionless models were presented for optimizing the aspect ratio of flat plate SAH and the outlet temperature (T out ) [3,4]. In addition, different cross-sections and geometries of the SAH duct and absorber were studied by some researchers such as the experimental investigation performed by Abdullah et al [5] on three SAHs having different cross sectional shapes (circular, semi-circular and half-circle plus isosceles triangle) with an absorber identical with a half-circle shape.…”

Section: Introductionmentioning

confidence: 99%

Influence of bladed and glazed entrance on the performance of solar air heaters

et al. 2018

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The performance of a flat plate single-pass Solar Air Heater (SAH) modified at the entrance region was experimentally investigated. This entrance region was covered with glass cover instead of steel. Using glass at the entrance region increases the heating area exposed to solar radiation and avoids the restriction of solar radiation from reaching this area as in case of steel cover. Also, guide blades were placed in the entrance region to ensure well air distribution on the absorber surface and hence enhancing the thermal performance of SAH. The modified SAH was compared with another of conventional entrance. The experiments were performed at four air flow rates ranged from 0.013 to 0.04 kg/s. The modifications led to good enhancement in both the air temperature difference and the efficiency. For the daily efficiency, the maximum values are 43.43, 40.48 and 32.92 % for the glazed-bladed entrance SAH, glazed entrance SAH and conventional SAH, respectively, at the rate of 0.04 kg/s. The glazed-bladed SAH showed a good improvement in the daily thermal efficiency by 6.72 to 10.5 % over the conventional heater and by 2.16 to 3.25 % over the glazed SAH.

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Optimal aspect ratios for non-isothermal flat plate solar collectors for air heating

Cited by 12 publications

References 15 publications

Design and Performance of Evacuated Solar Collector Microchannel Plates

Design and Performance of Evacuated Solar Collector Microchannel Plates

Thermal Analysis on Variable Thickness Absorber Plate Fin in Flat-Plate Solar Collectors Using Differential Transform Method

Influence of bladed and glazed entrance on the performance of solar air heaters

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