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HYBRID SOLAR/ELECTRIC FOOD DEHYDRATOR
Team 20Gwen Yates, Austin Strong, Chad Harker, Jim Clemens, Jordan Collette,
Sterling DeMilleCoach: Terri Bateman
Liaison: Illens DortL-3 Communications/Soldana
Social Entrepreneurship in Action
Target Area: Haiti & Dominican Republic The Republic of Haiti is a Caribbean island nation. It occupies the western, smaller portion of the island of Hispaniola, which it shares with the Dominican Republic.
Despite possessing rich farmland, real per capita food production has declined steadily since the 1980’s, both countries consistently import millions of tons of foods to feed their underfed populations.
The Problem in Haiti
• 60 - 70% (est.) of Haiti’s food crop goes to waste annually
• Haiti forced to import large amounts of food to sustain population
• Little available employment (major cause of high poverty rates)
The Problem in Haiti
In Short: Haiti has a resource (fruit) that could feed and employ people. It is being wasted.
The Solution: Soldana
"Soldana is a social enterprise with the mission of maximizing natural resources to create high quality products and services that improve the socioeconomic conditions of rural communities in Haiti and the Dominican Republic.”
-Soldana Mission Statement
Technical Solutions for Social Problems
+ =
Stage 1 Stage 2 Stage 3
• Wasted Resources (Fruit and People)
• No Work
• High Poverty
• Free Resource (Sun)
• Preserves Resource (Fruit)
• Provides Jobs-Manufacturing, Delivery, Operations, Marketing
Self Reliance
Improved Communities
Economic/Social Benefits
The Solution: Hybrid DehydratorElectric Powered
Drying System
+Solar Collector
GoalZero Solar Battery Pack
240 Ft2 Drying Space*FDA Grade Approved
SOLDANA HYBRID DEHYDRATOR
12” High Efficiency DC Fans
*SunLite HP Glazing
Soldana Hybrid Dehydrator
Operates completely “Off-Grid”
Capacity of 75-100 lbs of Fruit
FDA Approved Quality
24-Hour Operation (Day AND Night)
Easy to Use
Assembled Locally
The Solution: Household Dehydrator
Solar Model Solar/Electric Model
SunLite HP Glazing
Easily Removable Tray
Heating Element
Small Fan System
Engineering: Bringing It To Life
Engineering: Material SelectionTo determine the best combination of materials for the collector, we set up a DOE with three variables of two levels each, as follows:• Glazing Material: SunLite HP, Corrugated Polycarbonate• Absorber Material: Aluminum Window Screen, Aluminum Foil• Insulation Material: Black Paint, Foil Insulation
Collector Prototype
Engineering: Material Selection
Max Temperature Gain Averages
per Material Type (°F)SunLite HP 98.50Corrugated PC 96.67
Window Screen 98.14Tinfoil 95.67
Black Paint 82.00Foil Insulation 107.67
Collector Material Type Recommended MaterialGlazing SunLite HPAbsorber Black Aluminum Window ScreenInsulation Foil Insulation
COLLECTOR MATERIAL CONCLUSIONS
Final Collector Design
Engineering: Airflow VerificationOption
# Description Discharge % Fan Type# of Fans Cost per fan
Total CFM CFM/Watt Initial Cost BattLife Lifetime of Fan
Replacement Amoritization cost per year
1
4 high efficiency fans. 1 yeti required. 30% discharge
Snap fan 12" 4 $250 2320 83.3 $1,750 800
Fan: ~833 cycles (2.3 years) $780
2
1 Large high efficiency fan. 1
yeti required 30% dischargeSnap fan
24" 1 $610 1900 87 $1,360 800Fan: ~833 cycles
(2.3 years) $609
3A
1 Large medium efficiency fan. 2
yetis required 50% dischargeSnap fan
28" 1 $797 4430 45.1 $2,297 500Fan: ~833 cycles
(2.3 years) $1,444
3B
1 Large medium efficiency fan. 1 yetis required.
100% discharge
Snap fan 28" 1 $797 4430 45.1 $1,547 300
Fan: ~833 cycles (2.3 years) $1,262
4A
34 small fans (6x6 grid). 2 yetis
required. 50% discharge
Computer Fan 4.75" R1225-7 34 $14.28 3077 30.2 $1,986 500
Fan: ~4167 cycles (11.4 years) $1,138
4B
34 small fans (6x6 grid). 1 yeti
required.100%
discharge
Computer Fan 4.75" R1225-7 34 $14.28 3077 30.2 $1,236 300
Fan: ~4167 cycles (11.4 years) $955
5A
18 small fans (~4x4 grid). 2 yetis
required. 50% discharge
Computer Fan 4.75" G1751-5 15 $15 2911 29.2 $1,725 500
Fan: ~4167 cycles (11.4 years) $1,115
5B
18 small fans (~4x4 grid). 1 yeti required.
100% discharge
Computer Fan 4.75" G1751-5 15 $15 2911 29.2 $975 300
Fan: ~4167 cycles (11.4 years) $932
Engineering: Airflow Verification
LV 15
LV 1
• Evaporation Rates were measured over 3 hour periods in order to determine “areas of effective drying”.
• Used to determine optimal fan speeds and location
Engineering: Water Activity (Aw)
Tray Location AwTop Front 0.608Top Back 0.729Middle Front 0.544Middle Back 0.334Bottom Front 0.301Bottom Back 0.401
Fruit Target Aw = 0.65-0.60
Initial Water Activity Results
The Future
Thank You