Modelling and experimental studies on a mixed-mode natural convection solar crop-dryer

Forson, F.K.; Nazha, Marouan A. A.; Rajakaruna, Hobina

doi:10.1016/j.solener.2006.07.002

Cited by 73 publications

(33 citation statements)

References 14 publications

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“…The mixed-mode dryer has a device for preheating the air and also transparent walls of chamber for maximum radiant energy absorption. Studies on mixed-mode dryers have provided quite promising results [3,4]. However, the large size of the air heater makes the mixed-mode dryer too expensive for the normal rural farmer in a developing country.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of a chimney-dependent solar crop dryer

et al. 2009

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a b s t r a c tAn experimental investigation into the performance of a solar crop dryer with solar chimney and no air preheating is described. Tests were first performed on the cabinet dryer, using a normal chimney. The trials were repeated with a solar chimney. Still with the solar chimney, further trials were carried out with the roof of the drying chamber inclined further to form a tent dryer. The described tests include no-load tests for airflow rate measurements and drying tests, with cassava as the crop. Air velocities, temperatures, ambient relative humidity and the drop in crop moisture contents at different stages of the drying process are also presented. The effects of the various configurations described above on the drying process are deduced and discussed while comparing the experimental results with one another. In addition, the performance of the dryer in relation to other natural convection dryers is discussed. The results show that the solar chimney can increase the airflow rate of a direct-mode dryer especially when it is well designed with the appropriate angle of drying-chamber roof. However, the increase in flow rate only increases the drying rate when the relative humidity (RH) of the ambient air is below a certain mark (60% for cassava).

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Section: Introductionmentioning

confidence: 99%

Experimental investigations of a chimney-dependent solar crop dryer

et al. 2009

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“…Drying times to achieve safe storage moisture content for a variety of tropical crops have been shown experimentally to be reduced by over 20% when greenhouse drying with a solar chimney is compared to open-air drying under Brazilian conditions [45]. Detailed studies have been undertaken of passive solar dryers incorporating an air heating solar collector, transparent-walled drying chamber, and solar chimney [46].…”

Section: Solar Dryer Typesmentioning

confidence: 99%

Industrial and Agricultural Applications of Solar Heat

Norton¹

2012

Comprehensive Renewable Energy

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“…Modelling and experimental evaluation of natural convection dryer have been carried out by Sharma et al [26] in 1991, Bala and Woods [2] in 1995, Fournier and Guinebault [27] in 1996, Simate [28] in 2003, Azharul Karim and Hawlader [29] in 2005 and Forson et al [30] in 2007.…”

Section: In 2006mentioning

confidence: 99%

Development of a new type of solar dryer: Its mathematical modelling and experimental evaluation

Potdukhe¹,

Thombre

2008

Int. J. Energy Res.

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SUMMARYA solar dryer fitted with a novel design of absorber having inbuilt thermal storage capabilities was designed, fabricated, simulated and also tested at Rajiv Gandhi College of Engineering Research & Technology, Chandrapur (MS) India. Thermic oil was used as a storage material. The main objective of the study was to reduce the drying period and enhance the quality of dried product mainly chillies and fenugreek leaves. The products were laid in a single layer. The dimensions of the dryer were arrived at using the well-defined procedure available in literature. The mass of thermic oil needed in the absorber and mass of product to be dried in trays were optimized using simulation techniques. The maximum drying air temperature required for drying agricultural products was around 658C: The ambient conditions at the location were 25-408C; 16-43% RH and solar radiation 105-1024 W m À2 : Experimental studies based on temperature and humidity measurements were performed on the dryer. The research concluded that the desired drying air temperature was achieved and maintained for a longer period. The length of operation of the solar air heater and the efficiency of the dryer were increased, and better quality of agricultural products in terms of colour value were obtained compared with open sun drying.

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Modelling and experimental studies on a mixed-mode natural convection solar crop-dryer

Cited by 73 publications

References 14 publications

Experimental investigations of a chimney-dependent solar crop dryer

Experimental investigations of a chimney-dependent solar crop dryer

Industrial and Agricultural Applications of Solar Heat

Development of a new type of solar dryer: Its mathematical modelling and experimental evaluation

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