Wissenschaftswettbewerb Helden der Zukunft

1. Solar Kitchen and Kindergarden
for a School in Simbabwe
A Project
of students & professors of
HTL Pinkafeld in cooperation with PFAU

2. Abstract
The Kariyangwe Mission School in Simbabwe serves 800 pupils.
Since 2014, the year of a great draught, this students are provided
with one meal a day. These meals are cooked in 3 unhygienic pots
over inefficient bonfires consuming 25 tons of firewood a year.
But trees are scarce and deforestation a major problem. Therefor
a kitchen was planed and will be built to reduce the energy con-
sumption significantly. This will be reached by using solar power
as well as an efficient stove. Three different concepts where taken
into account and evaluated. The fuel reduction is estimated to be
80-90%. Hygiene, safety as well as comfort will be increased.
Further more a Kindergarten was planed and will be build parallel.

3. Simbabwe
• Population: 12,9 Mio.
• Area: 390,757 km²
• Capital: Harare
• GDP per capita: 837 US$
• Language: English
• Life expectancy: 58 years
• Children per woman: 3,65
• People < 15: 41,9%
• People > 60: 5,4% http://de.wikipedia.org/wiki/Simbabwe

4. Kariyangwe
570km
https://maps.google.at/maps
Kariyangwe
Binga
• Kariyangwe Mission School is
situated in the east of
Zimbabwe
• It is very remote located
• There is no sealed road

5. Climate
• Tropical climate
• Summer season
October to April (warm)
• Winter season
May to September (cool)
• Rainy season
November to March
(rainy)
Data extapolated for Kariyangwe by Meteonorm 6

6. Kariyangwe Mission Layout
• 17°58'15.26"S
27°32'3.11"E
• Catchment
• 10.000 people
• School
• 800 Students
• Hospital
• Housing
• Teachers
• Nursing
• Water Tower
• Toilets

7. The Mission -> Situation

8. The Mission -> Situation
• School
• 800 Students
• Hospital
• Housing
• Teachers
• Nursing

9. Food Program
Food Program for 800 students on 204 d/a
Firewood consumption: 20-25 t/a

10. Energy Need & Solar Supply
• Current firewood consumption: 20-25 t/a
• Approximately 100000kWh/a (4,2kWh/kg at 15% humidity)
• Solar irradiation
• Horizontal irradiation
2269kWh/m²a
• Direct irradiation
• 71% direct irradiation
• Ca. 266days with >5kWh/m²d
• Trackable direct irradiation
• 2409kWh/m²a
• Ca. 250days with >8kWh/m²d
Data extrapolated and calculated for Kariyangwe based on the data from Meteonorm 6
Sunshine Astronomic Sunshine
Sunshine[h]

11. Project Goals
• Construction of a kitchen for 1000 meals a day
• increasing hygiene and confort
• Reduction of fuel consumption
• Increasing stove efficiency
• Integrating solar power
• Collecting rainwater
• Establishing a Garden
• Integrating the locals
• Construction of a
kindergarten for 100 kids
http://www.solare-bruecke.org/index.php?option=com_content&view=article&id=2&Itemid=2&lang=de

12. Solar Cooking Concepts
• Pre evaluation of available technology
•Collecting Solar Power
• Photovoltaic (expansive)
• Flat Solar Collectors
• Vacuum tube collectors (risk)
• Flat mirror (low temperature)
• Irradiation Concentration
• Parabolic mirror (moving focus)
• Scheffler Reflector
• Parabolic troughs
• (Fresnel) lens (difficult production)
•Energy Medium/Absorber
• Metal
• Water
• Air (low energy density)
• Oil
• Electricity (to expansive)
•Ready made systems
• Haybox (slow, small)
• Solar funnel cooker (slow, small)
• Solar tea kettle (slow, small)

13. Solar Cooking Concepts
•Examined technologies
• Flat Solar Collectors
at 15-18° to heat
Water up to 80°C
• fixed
• Scheffler Reflector
to heat pots directly
up to 400°C [www.solare-bruecke.org]
• Daily adjusted, self tracking during day
• Parabolic troughs to
heat Corn Oil up to 200°
• or pressurized Water
up to 120°C at 1bar
• Daily adjusted

14. Flat collectors
• Pre evaluation of available technology

15. Parabolic Trough
• Parabolic trough 2x12m, E-W oriented, daily adjusted

16. Parabolic Trough / Water
• Parabolic trough with pressurized water at 120°
• Cooking pots, boilers, stoves, expansion tank are al made of
55 gallon barrels
• The kitchen design is shown later
pot
fire
chamber
chimney
pressure
relive valve
pressurizes
boiler
hand
pump
55 gallon
barrel
Parabolic Aluminum Mirror Stove, Bolier & Pressure Relive 98L Cooking Pot

17. Parabolic Trough / Corn Oil
• Parabolic trough with presureless corn oil at 200°
• Cooking pots, boiler, stove, expansion tank are al made of 55
gallon barrels
• The kitchen design is shown later
pot
fire
chamber
chimney
air vent
recondenser
hand
pump
55 gallon
barrel
pressurless
boiler
Parabolic Aluminum Mirror Stove, Bolier & Expansion Tank 98L Cooking Pot
expansion
tank

18. Scheffler Reflector
• Moveable insulated cooking
pots can be heated at solar
stoves or wooden stoves as
well es stored at the food
counter.
Foodcounter
Queuingarea
FoodcounterFoodcounter
Pot
Pot
Pot
Stoves
Pot
9m²
Scheffler
Reflector
9m²
Scheffler
Reflector
9m²
Scheffler
Reflector
9m²
Scheffler
Reflector
Pot

19. Scheffler Reflector
• Pre evaluation of available technology

20. Solar Concept Assessment
• Pre evaluation of available technology

21. Solar Concept Assessment
• Pre evaluation of available technology

22. Choosen System
• 35% of the solar energy supply will be provided by
12m² of flat collectors. They provide up to 80° hot
water with the help of a thermo syphon principle.
They also use diffuse radiation whereby providing also
war water on less sunny days. That water is used as
pre heated water to cook and wash.
• 65% of the solar energy supply will be provided by a
2x12m extendable parabolic troughs collector with
aluminum mirror. The heat fluid is pressurized water
at 120°C at 1bar. This water is used to heat the pots.
The water circulates with the help of handpumps.
• At ca. 60 days auxiliary heat is provided by an itegra-
ted stove which directly heats the process water.

23. Construction Overview
• Parabolic Mirrors
• Unshaded
• Solar kitchen
• For 1000 meals a day
• Kindergarten
• 100-125 3 to 5 year olds
• Enclosed playground
• Rainwater collection
• Close to toilets & infant Block

24. Solar Kitchen
• Ground plan
queuing
area
firewood
storage
food
counter
food
counter
food
counter
food preparation
food storage
firewood
storage
stove
boiler
expansion
tank

25. Solar Kitchen
• Cross section
Air vent
food
counter
queuing
area
firewood
storage
food
storage

26. Solar Kitchen
• Parabolic mirror to concentrate Solar irradiation

27. Solar Kitchen
• Wide porch to provide shelter for queuing students
• To provide dry storage space for firewood

28. Solar Kitchen
• Storage and preparation space to the right

29. Solar Kitchen
• Cooking pots and food counter to the left

30. Kindergarden
• 6 rooms
ca. 45m²
• 1 room for
caretakers
ca. 20m²
• 2 storerooms
ca. 15m²
• Playground
ca. 100m²

31. Kindergarden
• Light coloured atrium complex for 100-150 kids

32. Kindergarden
• Instead of removing trees they will be integrated

33. Kindergarden
• The arcade provides shade or shelter

34. Kindergarden
• The caretaker has a watchful eye on playing kids

35. Project Timeline
• Completed
• Design of all parts in Austria in a diploma thesis
• In Progress
• Sponsoring
• Prefabrication of small/light weight but crucial parts in
Austria by pupils of the HTL Pinkafeld
• tracking and control mechanisms, valves, vents
• Molds, forms, plans
• Implementation in August 2016 (4 weeks)
• Construction of all buildings by 30-40 local volunteers and 2-
4 Austrian students and 1-2 teachers

36. Reference Project
• In a similar project the HTL Pinkafeld designed and
constructed a hygienic water supply, sanitary block
and a grey water recycling sewage treatment facility
for 3000 students of the Lycée Lomé Port in Togo
during Summer and Winter holidays 2013
• www.youtube.com/watch?v=wh_BlXeP2ZI
• www.youtube.com/watch?v=sDJu2WwHjoE
• Further ongoing porjects
• A Home for Streetkids in Kigali
• Low Cost Well Drilling Jumbo for Bahia Brazil

37. Further Information
• Project Coordinator:
Wolfgang Leeb
Wolfgang.Leeb@htlpinkafeld.at
• Project Team
• Daniel Stögerer
• Andreas Stagl
• Philip Gräf
• Project Partner: PFAU
www.pfau-verein.org
• Homepage
www.htlpinkafeld.atSuGAR