Sustainable Living Center Oregon
The Go & Grow House© will be using five key elements necessary for a productive passive greenhouse: solar input; heat storage; and conservation.
An example of how a 12 X 16 Go & Grow House will look when completed.
Collecting, converting, and storing is accomplished through the use of:
The Go & Grow House is designed to uses these features to be a off-the-grid self-contained passive solar greenhouse that would only need, soil, sun and water to grow plants,
Orientation – The Grow House takes advantage of the changing angles of the sun throughout the seasons.
The coldest months (winter) the sun heating is increased. The Winter Sun travels in the southern portion of the sky, rising in the east and setting in the west. Therefore, it is important to face the Go & Grow House’s big windows as close to true south as possible. The path of the winter sun will always be lower in the sky with a shorter path than the summer sun.The winter season has the least sun, so we want to make the most of it.
The tilt should be designed so that the windows points directly at the sun at noon. To calculate, we multiply our latitude of Lincoln City, Oregon 42 degrees by 0.9, and add 30 degrees. (42 X .9 + 30 ) = 67.5 degrees tilt from horizontal.
The hottest months (summer) the sun heating is reduced.
The design acts like a thermostat. It produces heat in the winter during clear days. When the seasonal temperatures warm, the structure reduces the solar heating input.
By using Solexx glazing, with an R 2.1 rating. It is intended by using the Solexx, Thermal Heat Storage and Pebble Rocket Mass Heater it will eliminate the need for heaters, fuel tanks, and fuel.
Thermal Mass Heat Storage
Water is four times more efficient than earth or any other thermal mass. Using water is a perfectly available item and it is actually quite sustainable because you only fill the water containers once for the life of that container.”
It is recommend using 2 to 5 gallons of water per square-foot of glazing, typically stored in milk jugs or 55-gallon plastic black barrels. If you want it to run cool in the winter and warm in summer – meaning grow some tomatoes in the summer and grow all some greens and broccoli and all that good stuff that we love in winter – then 2 gallons is enough. But if you want to stabilize the heat and cold, then go 5-plus gallons per square-foot of glazing.
To stabilize, the glazing of the Go and Grow House is 10 ft X 10 ft or 100 square feet, and needs 500 gallons.
It is anticipated that there would be 164 gallons of water stored in 164 milk jugs lining the north, east, and west walls.
Disposable jugs are spray painted flat black and filled with water. When placed in the Go and Grow House on a series of bookshelves.
According to authors: David Whiting (CSU Extension, retired), with Carol O’Meara (CSU Extension, Boulder County), and Carl Wilson (CSU Extension, retired)with enough milk jugs it has known to raise the nighttime temperatures to 39°F with no supplemental heat when outside temperatures dropped to -17°F. Night curtains may add an additional 30 to 50% energy conservation.
There would be five (5) 55 gallons’ black barrels (275 gallons) set behind the south window wall, for a total of 539 gallons of terminal water heat storage.
South Window Wall
Use glass on the south wall because glass allows in more light and heat. You can use a clear poly carbonate, but if you’re going to use glass, put some in the south wall.
When you use diffused glazing – like poly carbonate, plastic greenhouse film or fiberglass – on the roof. Never do glass on the roof, because during summer when you have the most intense heat, it would be coming straight down through there. But if you diffuse the roof you scatter the light, there are no shadows, and it penetrates to the back wall throwing that light all over.”
Insulation – Walls and roof that do not collect heat are fitted with rigid insulation to prevent the heat lost. They are fitted with 3 ½” of rigid insulation with an R rating of 21. A passive solar greenhouse with the correct north, east, and west orientation walls, a R-value of R21 and the foundation and floor insulated from heat loss to the ground should have not need a lot of extra heat.
Venting – The top windows are designed to vent hot air on hot sunny days with automatic window openers. Humidity levels are kept low to prevent plant disease. Natural convection works when there are low windows and high windows are in equal size The lowest vents are as low as possible, the high vents are as high as possible. They should be sized to from 15 to 20 percent of floor space. When those vents are open, you want air moving freely throughout the greenhouse. Use common sense to picture how that air is going to flow to make sure all the areas of the greenhouse are getting ventilated.
For vent openers we will use passive openers like Univent that use paraffin-filled cylinders. As the temperature changes, the paraffin expands and contracts, opening and closing the vents.
Moisture – Moisture and mold in the walls is a problem in Oregon. Therefore all the walls are built to have air space on both sides of the wall. The outside of walls must have a cavity between the outside surfaces to keep the rain away from the insulation.
Manual Composting Toilet
The second feature of the Go & Grow House© is a toilet option called the Earth Auger©.
The Earth Auger was designed based on work by a retired professor at the University of Washington and is being funded by a Gates Foundation Grant.
This is a pedal-operated dry toilet. Urine is diverted and stored. The faeces is also stored.
The main innovation with the toilet is the mechanized, foot-pedal-actuated dry-flush system and sawdust delivery system that uses no water.
When the pedal is operated, the faeces, paper and sawdust are mechanically processed through a big pipe with an auger inside, which mixes, aerates and moves them through a chamber for storage.
Pathogens, which are the disease causing organisms, gradually die off during the period of time the faeces stays in the Earth Auger’s storage pipe.
Health organizations suggest about 4 months in warm climates, and possibly 6 months in temperate climates. Storage of faeces is detained in storage for 1-6 months. The time is dependent upon number of uses. The storage container will store 120 uses. Direct handling of excreta by the user is not required as the whole process is pedal-operated until harvest.
At that time of harvest, the material is totally dry. This material can be used on nonfood producing soils.
Urine is high in Nitrogen and is sterile when it exits the body.
The separated urine can be used on food producing soil when mixed with 1:10 with water.
A study conducted by the Stockholm Water Company diverted urine from four housing projects to a grain farmer outside the city. The scientists concluded not only that urine could replace quick-acting mineral fertilizers, but also calculated that one adult’s urine provided enough plant nutrients to grow 50 to 100 percent of a person’s food requirements.
Present Status of Project
The floor of the house has been laid and the walls are starting to being built. The fixed floor is 12 feet by 8 feet. The South wall is built to fold up, so it can be transported on a trailer down the highways. It is 4 feet by 12 feet long. When the South wall is folded out the Go and Grow House© will be 12 feet X 12 feet. The metal tubing for the Solexx is installed after the South wall is folded out
The Earth Auger© has been fitted and ready to be installed.
Volunteers are welcome