A solar collector design procedure for crop drying

Santos, Bianca Martins dos; Queiroz, Marlene R. de; Borges, Thomaz

doi:10.1590/s0104-66322005000200016

Cited by 33 publications

(22 citation statements)

References 9 publications

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“…From this work, it can be stated that observed loss coefficients and efficiencies, though perhaps useful for comparing alternative designs, are not meaningful for collector design because they depend on the design choices. For example, the range of the overall heat loss coefficient (U L ) at increasing collector length is between 4.3 and 7.7 W m À 2 K À 1 compared with 15 and 24 W m À 2 K À 1 by Koyuncu [13] and 5.5 W m À 2 K À 1 by Santos et al [33] The very different values underline the unsuitability of the heat loss coefficient (U L ) as design parameter.…”

Section: Collector Performancementioning

confidence: 95%

Distributed mathematical model supporting design and construction of solar collectors for drying

et al. 2017

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Coupled partial differential equations were developed to investigate which collector lengths are appropriate for drying and adsorbent regeneration under prevailing Ghanaian weather. Unlike approaches based on empirical data, the numerical model is more flexible. Effects of operational and design variables on outlet temperature and performance were systematically studied. Collector length and air speed affect performance indicators. Operational overall heat loss coefficient, an important characteristic of the collector, is not constant but varies during the day. With plausible physical parameters, the model describes the experimental data well. Collector lengths of 1.5 and 4.5 m suited drying and regeneration, respectively.

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Section: Collector Performancementioning

confidence: 95%

Distributed mathematical model supporting design and construction of solar collectors for drying

et al. 2017

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“…In this study, the absorber plate has common standard characteristics to simplify the analysis. These are listed below [1,3,6,7]:…”

Section: Thermal Analysis For Absorber Platementioning

confidence: 99%

Prevailing Parameter Evaluation with Heat Transfer Analysis of Absorber Plate in the Flat Solar Collector

2017

Acta Phys. Pol. A

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Solar radiation coming to a solar panel is absorbed and converted into thermal energy, increasing its temperature. This study is focused on the solar thermal panels. As known, the analysis of thermal performance of the collector includes such parameters as solar irradiance, ambient temperature and configuration of collectors etc. In this study, thermal analysis of the absorbent plate of a flat plate solar collector and the temperature transfer to the working fluid, were investigated. During thermal analysis the absorbent plate was considered as an onedimensional fin. It is assumed that lower surface of the solar panel is ideally insulated in this study. Therefore solar irradiance and heat loss to the environment are analyzed at the upper surface of the absorber plate. This study is aimed to investigate the relations of temperature distribution on the absorber plate and heat transfer from the absorber plate to the fluid. The achievable maximum fluid temperature at the practical working conditions, which quantifies the availability of usable heat energy, obtained by the collector, has been determined as a function of solar irradiance. Procedure is based on steady state analysis and on calculation of the thermal performance of flat-plate collector. The effects of the parameters, which determine the collector efficiency, have been investigated by evaluating all results. Results show that the flat-plate collector performs good and provides the desired quantity of hot water.

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“…(see [8]) where = mass of water in kilograms (kg), = specific heat of water (J/g ∘ C), Δ = temperature difference (outlet temperature-inlet temperature ∘ C), c = area of collector, = intensity of solar radiation, (W/m 2 ), and = collector efficiency. The equation simply equates the heat acquired by the collector to the heat received by the water.…”

Section: Efficiency Of Collectormentioning

confidence: 99%

“…(see [8]). The equation above requires us to know the mass of water to be heated, the specific heat of water ( ) which is a constant (4.18 J/g ∘ C), the outlet and inlet water temperature, the solar insolation of the environment, and the efficiency of the collector.…”

Section: Efficiency Of Collectormentioning

confidence: 99%

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Mitigating Climate Change by the Development and Deployment of Solar Water Heating Systems

Wara

Abe

2013

Journal of Energy

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Solar energy is becoming an alternative for the limited fossil fuel resources. One of the simplest and most direct applications of this energy is the conversion of solar radiation into heat, which can be used in Water Heating Systems. Ogun State in Nigeria was used as a case study. The solar radiation for the state was explored with an annual average of 4.775 kWh/m2recorded. The designed system comprised storage tanks and the collector unit which comprises wooden casing, copper tube, and aluminium foil. Test results for the unlagged and lagged storage tanks for water temperature at various angles of inclination (2.500°–20.000°) were on the average 27.800°C and 28.300°C, respectively, for the inlet temperature and 60.100°C and 63.000°C for the outlet temperature, respectively. The efficiency of the Solar Water Heating System was 72.500% and the power saved 2.798 kW. The cost of the unit is put at 1121,400 ($145) as at August 2012. The unit developed can be applied for the purpose of reducing the cost of energy, dealing with environmental challenges, and improving the use of energy, hence serving as a climate mitigation process as this can be extended for water heating for domestic and other industrial purposes.

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A solar collector design procedure for crop drying

Cited by 33 publications

References 9 publications

Distributed mathematical model supporting design and construction of solar collectors for drying

Distributed mathematical model supporting design and construction of solar collectors for drying

Prevailing Parameter Evaluation with Heat Transfer Analysis of Absorber Plate in the Flat Solar Collector

Mitigating Climate Change by the Development and Deployment of Solar Water Heating Systems

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