Design and simulation of a solar dryer for agriculture products

Bennamoun, Lyes; Belhamri, Azeddine

doi:10.1016/s0260-8774(02)00466-1

Cited by 127 publications

(63 citation statements)

References 10 publications

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“…I d can be estimated as direct radiation incident at 60 o on the collector surface by Eq. 5 [8,9], where C is the diffuse radiation factor. The total solar radiation, I t , incident on the horizontal surface is therefore given by adding the direct and diffused components of solar radiation as shown in Eq.…”

Section: Introductionmentioning

confidence: 99%

Thin layer drying kinetics of amaranth (Amaranthus cruentus) grains in a natural convection solar tent dryer.

Ronoh¹,

Kanali²,

Mailutha³

et al. 2010

African Journal of Food, Agriculture, Nutrition and Development

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An experimental solar tent dryer under natural convection was used to study thin layer drying kinetics of amaranth (Amaranthus cruentus) grains. Drying of grains in the dryer was carried out on a drying rack having two layers; top and bottom. The ambient temperature and relative humidity ranged from 22.6-30.4 o C and 25-52%, respectively, while the inside temperature and relative humidity in the solar dryer ranged from 31.2-54.7 o C and 22-34%, respectively. Freshly harvested amaranth grains with an average moisture content of 64% were dried under the solar tent dryer for seven hours to a final moisture content of 7% (dry basis). A non-linear regression analysis was used to evaluate six thin layer drying models (viz., Newton, Page, Modified Page, Henderson & Pabis, Logarithmic and Wang & Singh) for amaranth grains. The models were compared using coefficient of determination (R 2 ), root mean square error (RMSE), reduced chi-square (χ 2 ) and prediction performance (η p ) in order to determine the one that best described thin layer drying of amaranth grains. The results show that the Page model satisfactorily described the drying of amaranth grains with R 2 of 0.9980, χ 2 of 0.00016 and RMSE of 0.01175 for bottom layer and R 2 of 0.9996, χ 2 of 0.00003 and RMSE of 0.00550 for top layer of the drying rack. Based on a ±5% residual error interval, the Page model attained the highest prediction performance (η p = 80%) when drying the grains in both layers of the dryer. This shows that there was a good agreement between the predicted and experimental moisture changes during solar drying of amaranth grains under natural convection. The transport of water during dehydration was described by applying the Fick's diffusion model and the effective moisture diffusivity for solar tent drying of amaranth grains was found to be 5.88×10-12 m 2 s -1 at the bottom layer and 6.20×10-12 m 2 s -1 at the top layer. High temperatures developed at the top layer of the dryer led to high effective moisture diffusivity and this showed that temperature strongly influences the mechanism of moisture removal from the grains.

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Section: Introductionmentioning

confidence: 99%

Thin layer drying kinetics of amaranth (Amaranthus cruentus) grains in a natural convection solar tent dryer.

Ronoh¹,

Kanali²,

Mailutha³

et al. 2010

African Journal of Food, Agriculture, Nutrition and Development

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“…Furthermore, the figure shows that drying time of AS3 is longer than AS1 and this is probably due to the initial mass, as increasing the quantity of the samples leads to the increase of the drying time, as confirmed by the work published by Bennamoun and Belhamri (2003), dealing with forced convective drying of food stuffs. Figure 6 shows the variation of the exergy efficiency of the drying system during forced convective drying of wastewater sludge.…”

Section: Fundamental Results Of Application Of Forced Convective Dryimentioning

confidence: 52%

Forced Convective Drying of Wastewater Sludge with the Presentation of Exergy Analysis of the Dryer

Bennamoun

Fraikin

et al. 2015

Chemical Engineering Communications

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“…Indirect cabinet solar dryer with forced convection flow is one of the best solar drying technologies which can produce high-quality products and eliminate the risk of discolouration and distraction of vitamins [10] [11]. This dryer mode generally comprises of solar collector, drying unit, a fan, and ducting for air circulation [2].…”

Section: Indirect Solar Dryer Systemmentioning

confidence: 99%

Heat Transfer Optimization in Air Flat Plate Solar Collectors Integrated with Baffles

Bakari¹

2018

JPEE

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This paper presents an experimental analysis for comparisons of conventional flat plate solar collectors and collectors integrated with different numbers of baffles. Heat transfer between absorber plate and drying fluid (air) has been one of the major challenges in the design and operations of the indirect solar dryer systems. In this experiment, efficiency of air flat plate solar collector integrated with 2, 3, 4 and 8 baffles was studied and compared with the ordinary collector. The results showed that integrating solar collector with baffles significantly increased the efficiency of the system. It was noted that collector with 2, 3, 4 and 8 baffles had a mean efficiency of 29.2%, 31.3%, 33.1% and 33.7% respectively while with no baffles was 28.9%. The analysis showed that when there were less than four baffles in the collector, heat transfer was dominant over pressure drop and hence high efficiency. However, when the number of baffles exceeded four, the effect associated with an increase in pressure drop highly observed compared to heat transfer coefficient, thus resulted to insignificant increase in efficiency. Therefore, the optimum number of four baffles was commended for the designed model for optimum efficiency.

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Design and simulation of a solar dryer for agriculture products

Cited by 127 publications

References 10 publications

Thin layer drying kinetics of amaranth (Amaranthus cruentus) grains in a natural convection solar tent dryer.

Thin layer drying kinetics of amaranth (Amaranthus cruentus) grains in a natural convection solar tent dryer.

Forced Convective Drying of Wastewater Sludge with the Presentation of Exergy Analysis of the Dryer

Heat Transfer Optimization in Air Flat Plate Solar Collectors Integrated with Baffles

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