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Free solar energy using air convection 

as an integral part of building design - 

The Greenhouse!

This can be applied to any building - all the extra space is useful and the extra cost, so they say, is less than four percent (4%)! Closing and opening vents is only required once every six months.

PS Did we say Offices for Rent?

Passive Solar Heating - WINTER

Air circulated is NOT part of house air system. The house has regular central heating, fire-places and air conditioning, but use is minimized.  Any heating used within house goes finally to the roof - then recycles one or more times. The basement can be crawl space or full size with car-parking etc.. The building itself acts as the heat sink. The roof is of course well insulated and air-tight.

WINTER DAYTIME - Diagram showing (a) the greenhouse on the south side (b) the greenhouse wider than it needs to be (c) the air flow is so slow that the greenhouse is a pleasant place to be!

Air flow is slow, so space in greenhouse can be used as living space & for plants. Any windows except those of the greenhouse can be opened in any room without changing overall heat use. The building orientation should be SSW-NNE in Northern hemisphere. The North wall air-flow cavities should be at least 12" wide - 14" better. A similar cavity on the East and West walls also helps, but is not vital. Windows in such walls give a very pleasant feel to the house as the walls appear very think.

WINTER NIGHTTIME - Diagram showing (a) cooler greenhouse air falls (b) heat in house percolates to roof space and is recycled (c) nighttime air flow is almost at a standstill

Passive Solar Cooling - SUMMER -

The basement can have pebbled areas for sprinklers, using latent heat of evaporation cooling to best effect. All house windows should be double glazed. This system also (of course!) works for multi-floor buildings.

SUMMER Diagram showing (a) the greenhouse roof has open sliding panels (b) hot air in the greenhouse rises (c) the vents in the roof tower are open (d) air is replaced from underground and the basement, being the coolest available

The tunnel can be long and end under trees, clearly, the bigger and longer the better. It can also serve as drainage; the air is cooled during transit. 

No fans are needed as the hot air rising creates a Venturi effect which pulls air from under roof. The top roof vent assists in pulling cool air up the North wall.

Action is only required twice per year - once to open greenhouse, roof tower and tunnel doors; once to close them. 

As the greenhouse roof is open, rain will enter, so the furniture should be outdoors patio style, and the basement needs to drain back to the air tunnel(s).

 

SUMMER NIGHTTIME - Diagram showing (a) cooler greenhouse air falls (b)  nighttime air flow is almost at a standstill (c) windy nights improve cooling without disturbing residents

This idea is so simple, so effective, so pleasant to experience that it's a wonder it is not designed into every building.

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