In the One Tonne Life house, it is important to demonstrate that it’s possible to live energy-efficiently without compromising on either comfort or function. The Lindell family keep the heating going on cold days by utilising the building’s two separate systems. One consists of an energy-efficient underfloor heating system. This has been supplied by Uponor and features an intelligent control system called the Uponor Control System. This technology helps to efficiently distribute energy between the various rooms to ensure the maximum possible comfort while at the same time contributing to an energy saving of about 5%, thus also cutting carbon dioxide emissions.
Underfloor heating is only installed on the ground floor, where a cold floor would otherwise make a noticeable difference. On the first floor, the only heating source is heat distribution via the incoming air. This preheated incoming air heats up the first floor via valve-operated diffusers in the bedrooms and living-room. Before the air enters the house, it passes the ventilation unit which harnesses 84% of the heat energy in the outgoing air from the kitchen, bathroom and laundry room and uses this to warm up the incoming air. If this supplementary energy is not sufficient to maintain the required indoor temperature, an additional heating system linked to the accumulator tanks steps in. This takes place on exceptionally cold days.
These two heating systems are both based on solar energy, since they are both linked via the accumulator tanks to the house’s solar panels. If the sun cannot meet the building’s heating needs, for instance during the dark winter period, an immersion heater in the primary tank is activated. The primary tank is always in use and supplies the Lindells with heating and hot water throughout the year. When the sun shines most brightly, the house produces more energy than the family needs, and that energy is diverted to the building’s slave tank from where the stored energy can be used for a longer length of time throughout the year.
Christian Axelsson, A-hus