In our passive house we have different energy systems:
- Electricity from the main grid
- Water from the public supply
- Solar thermal energy from 12.6m2 collectors
- Solar power from 5m2 photovoltaic collectors
- Heat recovery ventilation
The electricity is supplied by the public power grid. It is a 3phase 230/400V- 25A connection. We have bought 10 shares in a 3MW turbine, which will be erected in 2010 here in the area app. 4km from our house. The 10 shares are equivalent to 10.000kWh of electricity per year. It is more than the consumption we recon to have from the grid. As such we generate more electricity from wind than we buy.
The house is heated with a thermal solar heating system. The collectors are 12.6m2 and placed on 2 walls facing near southwards. The vertical positions are not optimal, but practical. Their positions do work well in winter, where we need their heat at most. In summer they have reduced efficiency, which is fine, as we then limit the problem of overheating.
The heat from the solar collectors is pumped into a 1.000 liters storage tank. This tank is the heart of the heating system. From the storage tank, the warm tap water is generated via a heat exchanger. The heat exchanger is chosen because it has almost no tap water reservoir, say the hot tap water is always fresh heated water. This excludes the risk of growing legionella bacteria in a lukewarm reservoir.
The room heating is also coming from the storage tank. …
The ventilation of the house is connected to a heat recovery system. The used air is passing through 600 glass tubes, that are fixed in a wooden box in 2 aluminium plates, with 600 drilled holes in each and ends in a plastic pipe leading the air out of the house. At the same time fresh air is coming into the house through a second pipe and is introduced in the heat recovery system, passing inbetween the glass tubes and getting warmed up by that contact. It can be heated up to the needed temperature by being connected to the storage tank. The whole house needs only a little radiator which is connected to the heat exchanger and heats the air up to 45 degrees. Last winter where we had outside temperatures below zero, we had a pleasant inside temperature of 20 degree. The ventilator connected to the heat exchanger is activated by electricity produced by the photovoltaics.