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The Igloo

The Igloo. A Dome of Many Wonders. Outline. Igloo basics Igloo science Construction of an igloo An igloo in Hyde Park. What is an igloo?. Comes from Inuit word for house Usually means a dome-shaped dwelling made of snow Not a quinzhee. Igloo Culture.

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The Igloo

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  1. The Igloo A Dome of Many Wonders

  2. Outline • Igloo basics • Igloo science • Construction of an igloo • An igloo in Hyde Park

  3. What is an igloo? • Comes from Inuit word for house • Usually means a dome-shaped dwelling made of snow • Not a quinzhee

  4. Igloo Culture • Igloos were built by Inuit in the Canadian central arctic and Greenland’s west shore • Used mainly as temporary shelter on hunting trips • Larger semi-permanent igloos were also built that could house several families • Design of igloos varies between Inuit cultures

  5. Igloo Physics • A hemisphere is not a good dome shape • Ideal dome shape is a catenary – Innuit design is very close to this ideal • Height/Diameter = 0.3 for minimal stress • But compression  shrinking so it’s best to make H/D > 0.3 • Theoretical maximum size of igloo is: D = 34 ft., H = 12 ft.

  6. Igloo Physics • A hemisphere is not a good dome shape • Ideal dome shape is a catenary – Innuit design is very close to this ideal • Height/Diameter = 0.3 for minimal stress at base • But compression  shrinking so it’s best to make H/D > 0.3 • Theoretical maximum size of igloo is: D = 34 ft., H = 12 ft.

  7. More Igloo Physics • Rate of heat flow through igloo given by where Q/t = heat flow per unit time, k = thermal conductivity, A = area of interior/exterior of igloo, Ti = interior temperature, To = exterior temperature, L = thickness of igloo • Can calculate Q/t in the interior making simple assumptions about people • Using reasonable values, temperature difference between inside and outside can be about 60 C

  8. Construction of an Igloo • Snow must be packed • Cut wedge shaped snow blocks using snow saw • Lay blocks in helical pattern, cutting block thinner as you go up • Dig a trough leading into igloo and cover with snow blocks • Terrace interior to so that inhabitants are elevated • Cut ventilation holes

  9. Block laying pattern

  10. Construction of an Igloo • Snow must be packed • Cut wedge shaped snow blocks using snow saw • Lay blocks in helical pattern, cutting block thinner as you go up • Dig a trough leading into igloo and cover with snow blocks • Terrace interior to so that inhabitants are elevated • Cut ventilation holes

  11. Igloo Side View

  12. Igloos of the Future

  13. Building an Igloo in Hyde Park • Problem: snow is not well packed • Solution: pack it into buckets • Problem: snow is cold and not fun to touch • Solution: buy a shovel • Problem: people throwing shit at your igloo • Solution: none

  14. The location: 60th and Drexel

  15. Nick Igloo

  16. STAGE 1: COMPLETE

  17. The Finished Igloo!

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