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Introducing The Next Breakthrough in Solar Energy

Solar De-humid-hydrator. Introducing The Next Breakthrough in Solar Energy. Pooja Jain Harsha Singh Guneet Bhatia. Indira Gandhi Institue of Technology , Delhi.

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Introducing The Next Breakthrough in Solar Energy

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  1. Solar De-humid-hydrator Introducing The Next Breakthrough in Solar Energy Pooja Jain Harsha Singh Guneet Bhatia Indira Gandhi Institue of Technology , Delhi

  2. According to a survey on various industries related to processing of pulses, rice, biscuits, textiles, soap, electroplating etc. It has been observed that Industries dealing with pulses are using mechanical dryer based on diesel fired nosal type furnace. The consumption of diesel varies from 10 to 20 liters per hour.

  3. A New Direction Solar Energy has been a major source of conventional energy, readily available So why not harness it to our advantage??

  4. Principle of Operation It is based on the fact that when the food item or the crops are supplied with the blast of the hot air the moisture in the crops get evaporated and we are left with only the dry crops which can be used for the storage purposes for the long term use. Also the moisture that is being evaporated from these fruits/ vegetables generally contains some of the water soluble vitamins and minerals, so this hot air containing the moisture is then condensed to retrieve back some of the lost moisture

  5. Components of Our Model Solar Air Collector Air Blower Condenser Insulated Pipes Heating Box

  6. Material Used a • Galvanized sheets(G.I,24 gauge) • Thermocol(1’) • Black paint • Glass Sheet(5mm) • Aluminum Channel(22 gauge) • Insulated pipe (1 inch dia) • Copper tube ( 1.5 inch dia) • Ice box

  7. Working

  8. Specifications of the prototype • Effective collector area - 40 x 30 mm • Total collector area - 110 x12.5 x 41 mm • Storage area - 78 x 38 x 38 mm

  9. Experimental Observations • Tomatoes: • Pre-treatment : dipped in sodium metabisulfite solution for approx . 3 mins • Temperature : 55°c • Time taken : 4-5 days • Final moisture content : 11% • Red Pepper : • Pre-treatment : dipped in a solution of sodium metabisulhitefor about 1 sec. • Temperature :45 -50°c • Time taken : 1 day • Final moisture content : 3.5% • Green Paper : • Pre-treatment : dipped in a 2% solution of sodium metabisulphite for about 1 sec. • Temperature :45 -50°c • Time taken : 1 day • Final moisture content : 6%

  10. Onion: • Pre-treatment : dipped in sodium metabisulfite solution for approx . 3 mins • Temperature : 45 - 50°c • Time taken : 2-3 days • Final moisture content : 15% • Peach: • Pre-treatment : different concentrations of citric acid and sodium metabisulphite for about 1 sec • Temperature : 45 - 50°c • Time taken : 2-3 days • Final moisture content : 15% • Carrot : Pre-treatment :treated with a solution of sodium metabisulphite for approx 2 sec. • Temperature : 50 - 55°c • Time taken : 1-1.5 days • Final moisture content : 7.5%

  11. Apple: • Pre-treatment : treated with 2% citric acid or 2% sodium metabisulphite • Time taken : 2-3 days • Final moisture content : 10%

  12. Dehumidification • Hot air containing moisture is then passed through the condenser. • Amount of moisture/portable water finally received after dehumidification is • Tested for various water soluble vitamins/ minerals and is found positive for vitamin C.

  13. Benefits • Low set up cost and negligible running cost • Pollution free • Fossil fuel independent • Easily used in remote applications • Deep layer drying up to 15 cm • Reduces the emission of the green house gases • Dual Benefits: Preserves food and portable water having added nutrients as the end product. • Has great potential to be a future savior in arid regions.

  14. Limitations • Temperature range obtained is very limited • Efficiency is less as compared to electrical dehydrator present in market • Time consumed for drying is comparatively high. • Depends on the climatic conditions.

  15. Viability for Mass Production • Made from cheap and easily available raw material • Assembly time is pretty less • Has wide reachability as many areas are affected by food and water scarcity • Cost of operation is almost negligible • Very easy to operate • Government subsidies for solar heater installation at commercial scale

  16. Future Vision • The solar de-humid-hydrator is still in its vary nascent stage of development and hence there is immense scope of improvement in its design : • Rock bed can be introduced which can enable its working even when sunlight is not present • Condenser used can be made more efficient by incorporating refrigeration techniques in it • The design of collector can be further worked upon to increase amount of sunlight trapped by it. • Standardization of solar dehydrator and dehumidifier in order to maintain its quality • Promoting through public campaigns and mass media

  17. d References • Energy Security Through Low Cost Solar Air Heating And Drying Systems and Their Rural Applications by Dr. J.P kesari. • Design and applications of controlled atmosphere dehumidifier fruit driers by Chan, Bannister, Mc Hugh. • Technologies demonstrated at echo : the solar dehydrator by Jason Dahlman • 4.http://www.echotech.org/technical/technotes/Solar%20Dehydrator.pdf

  18. e Thank you!! Questions?

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