solar food drying presentation for thai delegation
TRANSCRIPT
Solar Food Drying
Gordon Hirst: Chief Engineer LIRE/SLBSunlabob Renewable Energy, LtdLao PDR
29 November, 2012
Solar Food Drying
What is Sunlabob?Laos-based social enterprise
that specializes in renewable energy & clean water projects in developing regions of the world.
Solutions & Technologies:Solar PVMini-hydro powerWater purificationEnergy efficiency
Operating in:Southeast AsiaAfricaIndiaPacific Islands
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
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
Solar Food Drying
• Benefits of Solar Food DryingClean energyReduction of energy costsClean drying (no smoke)Reduction in GHG’s (Carbon Credits ?)Hygienic
• Disadvantages of Solar Food DryingNot controllable and production is dependant on natural Phenomenon
Solar Food Drying
Conversion of solar irradiation into usable energy
•Solar power PV cells (Not suitable for solar drying)
•Solar Thermal (liquid)•Solar Air
Solar Food Drying
• Solar PV cells
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• Principles of solar thermal (water) drying
Solar Food Drying
• Principles of solar air drying
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• Principles of solar air drying
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
Solar Food Drying
• Solar survey theory
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• Heat energy required
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• Solar survey
Heat energy (solar irradiation) x ɳ (inefficiency : heat loss)≥ Heat energy required
Energy input profile required by food crop = heat generation profile.
Solar Food Drying
Solar surveyBasic heat energy equationQ = mCpΔtWhere:m = mass flow rateCp = Specific heat capacity of air = 1.005 Kj/Kg KΔt = Temperature differential
Volumetric flow rateVq = m/ρWhere:Ρ = density of air: dependant on altitude
Solar Food Drying
• System design
1. Solar collectors design2. Integration with building structure (wind and static loading)3. Air collection and transportation (Ductwork)4. Blower5. Back Up system6. Filtration7. Control8. Dryers
Solar Food Drying
• System design
Solar Food Drying
• Solar collectors
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• Solar collectors
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• Blower
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• Blower duty
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• Back up system
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• Filter
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• Control
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• Control
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• Static bed driers
Solar Food Drying
• Drum Dryers
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• Solar drying examples
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• Solar drying examples
Solar Food Drying
• Carbon Credits
Use of renewable energy is a fuel switch from fossil fuel and is eligible for carbon credits.
CDM MethodologyAMS- I.E ver 5 Switch from non-renewable biomass for thermal applications by the user
Sunlabob Contact
Thank YouSunlabob Renewable Energy, Ltd
PO Box 9077, Vientiane, Lao PDRTel: (+856-21) 313874 - Fax: (+856-21) 314045
[email protected] www.sunlabob.com