Experimental and modelling performances of a roof-integrated solar drying system for drying herbs and spices

Janjai, Serm; Srisittipokakun, N.; Bala, B. K.

doi:10.1016/j.energy.2007.08.009

Cited by 84 publications

(25 citation statements)

References 15 publications

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“…The use of this type of dryer can reduce drying time by three times compared to other types of dryers and reduce the required collector area by 50% [12]. Numerous indirect solar dryers have been designed and constructed; however, their utilization is still limited due to their poor performance [13]. Important criteria for adoption of this type of dryers include short drying time, low investment costs and improved quality of products.…”

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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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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“…Farm-built metal solar air heaters range from unglazed low-temperature units for animal husbandry through to double-glazed medium-temperature systems for crop drying [8]. The principal attractions of farm-built roof-mounted air heating collectors are the low initial investment required giving low-cost availability of heated air for drying [70]. The disadvantages are that potentially suboptimal design of system components and poor fabrication quality lead to poor performance.…”

Section: Solar Air Heatingmentioning

confidence: 99%

Industrial and Agricultural Applications of Solar Heat

Norton¹

2012

Comprehensive Renewable Energy

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“…Therefore, a suitable method of drying and storage of powder of ginger rhizome tubers is needed (Yiljep et al, 2005). Although several studies have been reported on drying of herbs and medicinal plants (Soysal and Öztekin, 2001;Janjaia et al, 2008;Arabhosseini, 2005;Yahya et al, 2004;Müller, 2007;Böhm et al, 2002;Heindl and Müller, 2002;Heindl, 2005;Arabhosseini et al, 2007) no study has been reported on drying of ginger rhizome. The purpose of this study is to determine the drying kinetics of ginger rhizome using solar hybrid and tray dryer; to determine the optimum drying air temperature, develop models of drying kinetics and also assess the quality attributes of dried ginger rhizome in terms of colour.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have been reported for solar drying of herbal and medicinal plants, such as mint, sage, and hops (Muller et al, 1989), aonla (Haque and Bala, 1996) and rosella flower (Janjaia, 2008). Solar drying results in considerable reduction in drying time and production of quality dried products.…”

Section: Introductionmentioning

confidence: 99%

Drying Kinetics Of Ginger Rhizome (Zingiber officinale)

Hoque

Bala

Hossain

et al. 2013

Bangladesh J. Agric. Res

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This paper presents the drying kinetics of ginger rhizome under blanched and nonblanched conditions using hybrid solar dryer and mechanical tray dryer at three temperature levels. The drying rate increases with the increase in drying air temperature and blanching also increases the drying rate. The drying rate depends on shape and size of the ginger rhizomes. The highest drying rate was found for sliced samples of ginger rhizome followed by splitted and whole root samples. Five thin layer drying models were fitted to the experimental data of blanched and sliced ginger rhizomes. The Page equation was found to be the best to predict the moisture content of sliced ginger rhizome in thin layer. The agreement between the predicted and experimental results was excellent. Colour of ginger rhizomes was slightly changed after drying. Lightness of ginger rhizomes decreased with an increase in drying temperature for all samples except sliced and blanched samples. For drying of ginger rhizome, it should be sliced and blanched and dried below 70 0 C for better quality dried products.

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Experimental and modelling performances of a roof-integrated solar drying system for drying herbs and spices

Cited by 84 publications

References 15 publications

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

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

Industrial and Agricultural Applications of Solar Heat

Drying Kinetics Of Ginger Rhizome (Zingiber officinale)

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