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Solar food drying Presentation for Thai delegation

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Solar food drying Presentation for Thai delegation

  1. 1. Solar Food Drying Gordon Hirst: Chief Engineer LIRE/SLB Sunlabob Renewable Energy, Ltd Lao PDR 29 November, 2012 Solar Food Drying
  2. 2. What is Sunlabob? Laos-based social enterprise that specializes in renewable energy & clean water projects in developing regions of the world. Solutions & Technologies: Solar PV Mini-hydro power Water purification Energy efficiency Operating in: Southeast Asia Africa India Pacific Islands
  3. 3. Solar Food Drying • Sunlabob Mission  Profit-driven, socially-minded business approach  Focus on economic, social and environmental sustainability  Deliver clean energy and water to rural, off-grid populations
  4. 4. Solar Food Drying • Lauching of Sunlabob  2001: The first commercial company working in the field of renewable energy in the Lao PDR  Aim: Provide renewable energy solutions to rural areas not yet connected to the national grid. Founders: Andy Schroeter and Saleumphone Vongsakhampui
  5. 5. Solar Food Drying • Benefits of Solar Food Drying Clean energy Reduction of energy costs Clean drying (no smoke) Reduction in GHG’s (Carbon Credits ?) Hygienic • Disadvantages of Solar Food Drying Not controllable and production is dependant on natural Phenomenon
  6. 6. Solar Food Drying Conversion of solar irradiation into usable energy •Solar power PV cells (Not suitable for solar drying) •Solar Thermal (liquid) •Solar Air
  7. 7. Solar Food Drying • Solar PV cells
  8. 8. Solar Food Drying • Principles of solar thermal (water) drying
  9. 9. Solar Food Drying • Principles of solar air drying
  10. 10. Solar Food Drying • Principles of solar air drying
  11. 11. Solar Food Drying Solar air vs Solar thermal • Solar air  Simpler and cheaper  Much less moving parts  Does not require a thermal transfer stage  Easier to expand system • Solar thermal  Higher irradiation absorption  Heat storage capacity is greater
  12. 12. Solar Food Drying • Solar survey theory
  13. 13. Solar Food Drying • Heat energy required
  14. 14. Solar Food Drying • Solar survey Heat energy (solar irradiation) x ɳ (inefficiency : heat loss)≥ Heat energy required Energy input profile required by food crop = heat generation profile.
  15. 15. Solar Food Drying Solar survey Basic heat energy equation Q = mCpΔt Where: m = mass flow rate Cp = Specific heat capacity of air = 1.005 Kj/Kg K Δt = Temperature differential Volumetric flow rate Vq = m/ρ Where: Ρ = density of air: dependant on altitude
  16. 16. Solar Food Drying • System design 1. Solar collectors design 2. Integration with building structure (wind and static loading) 3. Air collection and transportation (Ductwork) 4. Blower 5. Back Up system 6. Filtration 7. Control 8. Dryers
  17. 17. Solar Food Drying • System design
  18. 18. Solar Food Drying • Solar collectors
  19. 19. Solar Food Drying • Solar collectors
  20. 20. Solar Food Drying • Blower
  21. 21. Solar Food Drying • Blower duty
  22. 22. Solar Food Drying • Back up system
  23. 23. Solar Food Drying • Filter
  24. 24. Solar Food Drying • Control
  25. 25. Solar Food Drying • Control
  26. 26. Solar Food Drying • Static bed driers
  27. 27. Solar Food Drying • Drum Dryers
  28. 28. Solar Food Drying • Solar drying examples
  29. 29. Solar Food Drying • Solar drying examples
  30. 30. Solar Food Drying • Carbon Credits Use of renewable energy is a fuel switch from fossil fuel and is eligible for carbon credits. CDM Methodology AMS- I.E ver 5 Switch from non-renewable biomass for thermal applications by the user
  31. 31. Sunlabob Contact Thank You Sunlabob Renewable Energy, Ltd PO Box 9077, Vientiane, Lao PDR Tel: (+856-21) 313874 - Fax: (+856-21) 314045 contact@sunlabob.com www.sunlabob.com

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