The One Tonne Life project has ended and the content on this web page is static and is not updated any more. The project was unique and pioneering, making the conclusions and all information connected to the project just as interesting and up-to-date today as when it was run. Read more about the project and get inspired! (March 2017)

One Tonne Life
Vattenfall

Tag: energy-efficient

Heating system

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

How energy-efficient can a tumble drier be?

The tumble-drier is the item of household machinery with the worst reputation from the viewpoint of energy consumption. But the fact is that if you live in a Nordic climate and dry your clothes during the winter months using a Siemens tumble drier featuring a built-in heat pump, it is actually more energy-efficient than hanging up your clothes to dry indoors. This is because the moist air that exits the laundry drying room has to be heated up, and this process uses more energy than the tumble drier does.

The One Tonne Life house is equipped with a Siemens tumble drier featuring a heat pump. It consumes 50 percent less energy than a Class A drier, in other words A-50%. Thanks to a steady flow of air combined with heat pump technology, it is possible to maintain a lower temperature without impacting efficiency. A lower temperature makes the tumble drier more economical to operate, at the same time as it dries the clothes more gently.

Article number: WT 46W571DN

Hans Söderberg, Siemens

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