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: Christian Axelsson

From forest to finished house – part 3: the house factory

In 1960 Derome supplemented its sawmill business with building material sales. Today the company supplies construction materials and prefabricated building components as well as complete houses under the A-hus and Varbergshus brands. The A-hus brand covers prefabricated houses that can be picked straight from the catalogue, with the focus on design. In addition to sales in Sweden, these houses are also exported to the Netherlands, Belgium, Germany and Denmark.

The factory in which they are built is located at the very same site where the company was founded. Production is highly rationalised. A CAD system generates core data files with information for the production line, which uses the drawings to produce the houses. Every year, A-hus builds and sells 350 houses, that is to say about one a day. The Lindell family went to have a look at the house factory.

The family examine the production line together with Petra Cederhed of A-hus (on the right)…

…and Peter Mossbrant, President of A-hus (on the left).

Christian Axelsson of A-hus in discussion with Alicja about the plastic sheeting that serves as the “climate shell” of the One Tonne Life house.

Cross-section of a One Tonne Life wall, with the plastic sheeting inserted in two layers.

Hannah inspects the growth rings in the timber used for the facade.

The house walls are insulated.

Jonathan got to apply insulation strips to a window. He managed it well …

…as did Nils.

When the time came to try the nail gun, Jonathan focused on looking as cool as possible …

…while Hannah went all-out for enthusiasm …

…but wasn’t quite ready for the recoil!

Hannah shows the nails used in the nail gun.

Hannah watches as a window receives its final insulation treatment. This is the last step before …

…the module is ready.

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

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