Studies on Semi-Cylindrical Solar Tunnel Dryer for Drying Di-basic Calcium Phosphate

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 9 (2007): Studies on Semi-Cylindrical Solar Tunnel Dryer for Drying Di-basic Calcium Phosphate. Manuscript EE 07 001. Vol. IX. October, 2007

Design and techno economic evaluation of biomass gasifier for industrial thermal applications

This paper addresses the design, performance and economic evaluation of biomass based open core downdraft gasifier for industrial process heat application. The gasifier is having feed rate as 90 kg h-1 and producing about 850 MJ h-1 of heat. The gasifier has been installed in M/S Phosphate India Pvt. Limited, Udaipur (27° 42' N, 75° 33' E) for heating and concentrating phosphoric acid. The system is in position to save 20 L of light diesel oil per hour. The techno economics of the designed system is also presented in the paper.Key words: Biomass, gasifier, downdraft, feed stock

INTEGRATED MANAGEMENT OF TERMITE IN CROPPING SYSTEMS IN WESTERN RAJASTHAN

Host range, geographical distribution and extent of damage done by termites in crop tress and grasses have been documented. Ecofriendly control methods including cultural, biological, chemical and by botanicals were attempted. Natural enemies of termites are identified. Potentiality of predation of both vertebrates was investigated. Birds and ants were found voracious predators of termites. Comparative efficacy of insecticide, and botanical product has been workedout in crops and tree seedling management

Experimental investigation of the performance of the solar tunnel dryer for drying aonla pulp

This article presents the critical design specifications and field performance of an improved solar tunnel dryer for drying aonla plup. The dryer consists of an ultraviolet stabilised semi-transparent polythene sheet of 200-micron thickness with loading capacity of 1 ton of aonla in a batch. Drying of aonla is mainly carried out by traditional method of sun drying, but the use of improved solar tunnel dryer has led to a considerable reduction in drying time and dried aonla of better quality in comparison to aonla dried under the sun or other solar dryer. The results, shown by plotting the variation of air temperature, moisture content, etc. indicate that the dryer performs better with chimneys, exhaust fans, north wall, as they considerably reduce the fluctuations in the drying air temperature with fluctuating solar radiation.aonla pulp; drying rate; performance evaluation; solar tunnel dryers; ultraviolet; wet basis; UV semi-transparent polythene sheet; air temperature; solar radiation.

Experimental studies on hemi cylindrical walk-in type solar tunnel dryer for grape drying

A walk-in type hemi cylindrical solar tunnel dryer has been built with heat protective north wall at College of Dairy and Food Science Technology, Udaipur, India for drying agricultural & horticulture product on large scale. In this paper attempt has been made to evaluate the performance of developed dryer to dry the seedless grapes (mutant: Sonaka). The study show that chemically untreated grapes took seven days to dry at 16% (wb) moisture content. The temperature gradient inside the tunnel dryer is about 10-28 °C during the clear day, which is quite sufficient to dry agricultural commodities.Solar tunnel dryer Grape drying North wall Drying time

Development of Solar Tunnel Dryer For Industrial Use

This paper deals with a technology for drying of Di-basic calcium phosphate (DCP) through solar energy. For drying this material a solar tunnel dryer was designed and commissioned at MIS Phosphate India Limited, Udaipur. It is semi-cylindrical shaped tunnel dryer having a loading capacity of 1.5 tonne per batch. Two such tunnels were installed in series to accommodate 3.0 tonne of material. It is observed that maximum temperature inside the solar tunnel dryer was 62°C and 50°C on a summer and winter day respectively, which is about 15°C higher than ambient temperature. Total 16 h were needed for drying DCP up to the safe moisture content during winter seasons while total 12 h were needed during summer seasons for reducing moisture content from 37.3% to 9.4%. The solar tunnel drying reduces moisture content to around 10%. Thereafter, the moisture content is reduced to around 5% in a spin-flash dryer for final delivery to market

Not Available

Not AvailableNot AvailableNot Availabl

Not Available

Not AvailableA four-year field experiment was conducted in order to assess the productivity and economic potential of five cropping systems, with two tillage (conventional and deep) and four nutrient management [no application, farm yard manure (FYM) at 5 t ha 1, chemical fertilizer (CF), FYM at 5 t ha 1 þ CF] treatments in a hot, arid environment at Bikaner, India. Pearl millet [Pennisetum glaucum (L.) R. Br], cluster bean [Cyamopsis tetragonoloba (L.) Taub.] and moth bean [Vigna aconitifolia (Jacq.) Marechal] were grown in five rotations. The five rotations were: moth beanepearl millet, cluster beanepearl millet, moth beanecluster bean, pearl milletepearl millet and pearl millet þ cluster beanepearl millet þ cluster bean. The moth beanecluster bean cropping system recorded 21e148%, 36e246% and 33e178% higher equivalent yields, return and water use efficiency, respectively than other cropping systems. Deep tillage increased equivalent yields by 20% higher than conventional tillage. The combined application of CF and FYM recorded 15 and 32% higher equivalent yields than their respective sole application. In this hot, arid ecosystem, a legumeelegume system was more productive and profitable than other systems, and higher crop yields could be achieved by combining deep tillage with the integrated use of CF and FYM.Not Availabl