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Create Green Home
Roadmap to healthy,
comfortable and environmentally responsible homes |
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Green
Project - Solar Hot Water System in Italy |
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New Passive
House Certified in Maine!
More...
Solar System
gives German family plenty of Free
Hot Water!
More...
Passive House Project
in Canada:
More...
Habitat Metro
Denver Home
- affordable energy efficient
home achieves 59% energy savings!
2009 Solar Decathlon in Washington, DC, has a
Winner!
More...
Team Germany
(Technische Universität Darmstadt) |
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Young family built a new home in 2005 keeping in
mind raising energy cost and fairly large
temperature differences between summers and winters
that are characteristic for the mountainous region
of northern Italy.
Besides being well insulated (40cm, ~16in walls with
multiple layers of insulation), the house also
incorporated an economic and simple solar hot water
system to supplement family's hot water and heating
needs. |
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Solar panels installed on the south facing roof |
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Solar Hot Water
system consists of two small collector panels, (total area of
2.8 m2, or ~9 ft2), set of connecting
pipes, hot water tank (300 lit, ~80 gal) along with solar
pumping station and expansion tanks. The system is filled with a
refrigerant (antifreeze, antiboil) that exchanges the energy
with the water in the tank through a built in coil
heat-exchanger.
Solar panels are
built into the roof structure, set flush with the tiles
providing minimal interference with any other structure on the
roof while receiving good accessibility for service. When water
in the panels gets too hot (over 90C), cold water is mixed in
the system or it is dumped via a relief valve. Pump engages via
a thermal controller and circulates the fluid in the system when
it reaches a predetermined temperature.
The SHW
system is manufactured by
Sonnenkraft,
a company from neighboring Austria. Total installed cost in 2005
was €5000
(about $6000 at 2005 exchange rate).
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Solar hot water storage tank with
solar pumping station, flow controllers and expansion tanks. |
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In
cold winter months, additional energy is provided by
a gas burner that is coupled with the SHW system.
The burner supplements needed energy for hot water
and heating when panels receive very little energy
from the sun. For the last 3 years of being in
service, the system supplies ample hot water for ALL
hot water needs during months of May to October when
the family switches off their gas burner completely. |
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Enclosed wood burning fireplace -
extracts heat from exhaust gasses and stores it in the
masonry walls |
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An interesting addition to the house heating system,
even though not connected with the SHW system, is
the enclosed masonry fireplace. It is made by an
Austrian manufacturer and consist of a set of
twisting air channels that extract most of the heat
from the exhaust gasses and absorbs them in the
masonry walls of the fireplace. High thermal inertia
walls then emit the warmth throughout the day
requiring only several logs being fed into the
fireplace during the morning. Burning process is
very efficient and slow.
Rest
of the heating system consists of a gas burner with
a high efficiency condensation heater that works
with low temperatures and heats the house through a
network of radiators. |
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