Passive Solar Greenhouses: Introduction.

Passive and solar Green Houses

1. Passive Solar Greenhouses Dr Ashok Yadav, Prof. Horticulture Department of Horticulture, Guru Kashi University, Bathinda, Punjab, India Mobile: [phone] Email: yadavakdr@gmail. com ,[email protected]

2. Passive Solar Elements Orientation / Southern Facing Overhang, Solar Control Solar Heat Collection - Windows (glazing) Materials: Thermal Mass Insulation Saturday, September 15, 2012 2

3. Advantages Can enable to be off the grid No bills Harness the power of the sun Many, many more Saturday, September 15, 2012 3

4. Passive vs. Active Solar • A passive solar building will simply, passively sit where it is located and be efficient because of its design. The design is based off of the movements and available energy of the sun, as well as the materials used to construct it. • Active solar heating and electrical systems also use the sun’s energy but with additional mechanical means used in the process of harnessing its energy. Photovoltaic (PV) panels, pumps, thermostats and fans are objects that are commonly referred to as being active solar because they need some electrical input or conversion for their systems to function. • Passive and active solar elements are commonly combined. Saturday, September 15, 2012 4

5. How Passive Solar Works A passive solar building is designed and built based on utilizing the constants within the surrounding environment, centered around the movement of the sun. When a passive solar building is designed and build well, the building simply, passively sits there and will be warm in the winter when it is cold outside, and will be cool in the summer when it is hot outside. (It’s like the Aikido of martial arts.) Saturday, September 15, 2012 5

6. A building must face the south in order to capture the sun’s energy. Saturday, September 15, 2012 6 Building Orientation The long side of the house should be on an east - west axis.

7. Used Throughout History The Anasazi of the Southwest built in the southern facing cliffs. This created shade in the summer and full sun in the winter. The stone (thermal mass) absorbs and radiates heat in the winter. It keeps the living area cool in the summer. Saturday, September 15, 2012 7

8. The Sun’s Movement Saturday, September 15, 2012 8

9. The Sun Throughout the Seasons Saturday, September 15, 2012 9 A pinhole photography artist strapped a camera to a telephone pole and recorded the sun for one year. The sun’s path on the summer solstice is thehighest and widest arc, while the lowest and most narrow arc shows the sun’s path on the winter solstice.

10. Cliff house dwellings at Mesa Verde. Summer (top) Fall (right) Saturday, September 15, 2012 10

11. Overhang / Solar Control Overhang / Blocking Summer Sun Saturday, September 15, 2012 11

12. Overhang / Block the Sun Saturday, September 15, 2012 12

13. Solar Glazing AKA Windows On the southern side of the house (In the northern hemisphere) Windows allow solar heat into the house in the winter so that (ideally) the heat is absorbed into the thermal mass. Saturday, September 15, 2012 13

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16. Thermal Mass Saturday, September 15, 2012 16 A material that has thermal mass is one that has the capacity to absorb, store and release the sun’s heat energy . Its density and levels of conductivity help to keep the internal temperature of a building stable. Objects that have thermal mass have inherent qualities for both heating and cooling. Water also is very dense and has a high capacity to store and release heat.

17. G r eenhouse “Heat Sink” Saturday, September 15, 2012 17 - 2 feet of crushed gravel - Fans pull hot air to a manifold located under the rock Passive Solar Homes Must Have Thermal Mass Masonry Stove Kitchen Tile

18. Trombe Wall Other ways of bulking up with thermal mass. Saturday, September 15, 2012 18

19. The Trombe wall absorbs and radiates solar heat in the winter, while its mass keeps the house cool in the summer. Saturday, September 15, 2012 19

20. The Trombe wall is painted black to absorb the maximum amount of solar heat. 2 feet gap. Saturday, September 15, 2012 20

21. Modifications to the Trombe Wall Solar Decathlon 2011 - Solar Homestead from Appalachian State The material that absorbs the sun’s solar heat is rectangular shaped, with a metallic casing that has been painted black and filled with a plant-based oil mixture. The mixture is a phase change material (PCM) that becomes liquefied when it warms and slowly releases the heat through the cooler evening and night as it returns to a waxy solid material. Saturday, September 15, 2012 21

22. Insulation Stay cool in the summer and warm in the winter. Saturday, September 15, 2012 22

23. This roof is referred to as an ‘Idaho’ double roof. It is a roof with two separate roof systems comprising 20 inches. Beyond the tongue-and-groove wood paneling is a high density fiberglass insulation, followed by a layer of aluminum foil. Beyond that is a 4 inch urethane SIP (structured insulated panel) that is then covered by a metallic roof. Passive Solar Works Best With All Elements Working Together. The Importance of Insulation Saturday, September 15, 2012 23

24. Insulation vs.Windows When a house is closed to the elements, most of the heat is lost through the windows. Passive solar houses absorb solar heat through the windows on the south side, while they minimize heat loss through the windows on the north side of the house. Saturday, September 15, 2012 24

25. Passive Solar Houses Saturday, September 15, 2012 25 Should be well-insulated Windows (glazing) facing the south, minimized on the north.

26. Retrofitting to Passive Solar Saturday, September 15, 2012 26

27. From Farm House to Passive Solar Saturday, September 15, 2012 27

28. Inside the Retrofit Saturday, September 15, 2012 28

29. Ea r thships The Earthship type of housing, imagined into actuality by architect Michael Reynolds, uses recyclable, easily available materials to create a type of housing that can potentially sustain a household living off the grid. A passive solar type of building, the Earthship collects its own water, has its own water treatment system, can grow its own vegetables and generate its own electricity from solar photovoltaic (PV)panels and wind turbines. Saturday, September 15, 2012 29

30. The ancient Greek playwright Aeschylus: “Only primitives & barbarians lack knowledge of houses turned to face the Winter sun.” Saturday, September 15, 2012 30

31. GreenPassiveSolar.com Keya Lea Horiuchi facebook.com/greenpassivesolar twitter.com/GreenSolarMag Saturday, September 15, 2012 31