Passive cooling

1. Passive cooling

2. Passive cooling 1.Heat avoidance; Minimizing heat gain in the building 2. Passive cooling; lowering temperatures  mainly through ventilation 3. Mechanical cooling if not enough  Not passive

3. First avoid heat through:

4. First avoid heat through: • Shading • Orientation • light colors • vegetation • insulated envelope

5. Passive cooling • Passive cooling depends highly on the climate and it differs from one to another. • Hot and dry treatments: • Few & small windows. • Light surface colors • Massive construction (thick walls of adobe, brick or stone) • High ceilings

6. Construction Thick walls Domes roof

7. Thick walls Small openings Deep Courtyards Narrow alleys Shaded areas

8. Mesa verde, colorado

9. Old and new

10. Differences in ceiling heights winter summer

11. Hot and very humid climates treatment • Lightweight structures • Maximum ventilation • Shading • Minimize thermal mass

12. Light structures Maximum ventilation Shadings Minimize thermal mass Movable wall panels Maximum ventilation

13. built of a raised light wood frame tall openings to maximize ventilation very high ceiling Deep shaded verandas

14. Passive cooling • Passive cooling is achieved through : • Ventilation • Radiant cooling • Evaporative cooling • Earth cooling

15. 1-Passive ventilation • Ventilation: • Thermal mass thick and insulated • Operable windows opened at night & closed at day

17. Passive Ventilation Ventilation forms: • Wind scoops

19. Wind towers

22. mashrabiya

25. Smart facades • The Commerzbank Headquarters Building in Frankfurt, Germany, designed by Foster and Partners

27. 2-Radiant cooling • Thermal mass  stores during the day  emits during the night Passive solar: collects heat during the day and warm the area at night Passive cooling: get rid on heat at night and have cooler mornings through the use of insulation (heat sink during the day)

28. Harold Hay; plastic bags with water

30. 3.Evaporative cooling • When water evaporates it draws heat out and temperatures drop 1.Direct evaporation

31. Geothermal cooling systems

32. InDirect evaporation

35. Water for cooling • contact between cool water and hot dry air produces evaporations and results in a heat loss to surrounding areas.

40. Combination of domes, wind catchers, courtyard and water

41. Earth cooling

42. the world’s first wind-powered mega structure