Seminar Details

Seminar Title
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Mathematical and experimental studies of a solar dryer
Seminar Type
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Registration Seminar
Department
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Mechanical Engineering
Speaker Type
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Student
Speaker Name
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Thota S S Bhaskara Rao (518ME1026)
Date  &  Time
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05 Aug 2020  3:30 PM
Venue
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Seminar Hall, Mechanical Engineering Department
Contact
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Dr R K Behera, ME, 06612462504
Abstract
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Health consciousness has been increasing gradually in the entire world in the last three decades. Naturally and artificially produced medicines are consumed by the people for curing short and long term diseases. Many natural medicines and some of the artificial medicines are produced using medicinal herbs and plants. Direct and indirect usages of medicinal herbs require special conditioning and drying. Medicinal herbs need to be stored and preserved properly because they are not available throughout the year. The moisture present in leaves and other parts of medicinal plants need to be reduced or removed without affecting their quality for medicinal use. Drying offers improved shelf life, reduced density and low transportation cost. Drying takes place due to the difference in moisture concentration between the drying air and the air in the vicinity of crop surface. In recent years application of solar dryers for drying medicinal herbs finds an attractive place. In the solar dryers, air is first heated up in a solar thermal collector and then sent to a drying chamber. The hot air is allowed to flow through/over the wet herb that provides the heat for moisture evaporation by convective heat transfer between the hot air and the wet herb. There are two major classifications of solar drying methods; (i) direct solar drying and (ii) indirect solar drying. In both the solar drying methods, there are a few common types of dryer are available which are; (i) Cabinet dryer (ii) Box type dryer and (iii) Tunnel dryer. In recent years the use of evacuated tube solar collector (ETSC) has been focused in the research study because it offers a few distinct merits such as lower heat loss, works better in cold climates and higher absorption coefficient than other solar dryers. However, there are a few technical challenges need to be resolved. Some of the technical challenges are improving the heat transfer, temperature limitations of the collector and integrating thermal energy storage devices for improving the efficiency and maximum possible utilization. Considering these technical challenges, this research investigation is aimed to carryout mathematical and experimental studies on the use of an ETSC with U-pipe for improving the performance of the solar dryer. Further, the performance of the ETSC assisted solar dryer integrated with thermal energy storage device will also be evaluated for its maximum possible utilization in drying of medicinal herbs.