Innovative Climate Control System for Buildings

In 2017, Dudoc Vancouver welcomed its Dutch partner Duraflow.


Duraflow offers an innovative climate control system for buildings. By applying phase changing materials (PCM) intelligently, Duraflow stabilizes the indoor temperature and greatly reduces the power that is needed for heating and cooling. The energy savings result in reduced CO2-emmissions and decreased maintenance to the climate installation. Duraflow’s installation can be applied to many situations. These include office automation, renovation, and construction of buildings and they are particularly effective in data centres.

Phase Changing Materials

The innovative installation works with PCM. The best-known PCM is water, with well-known phase changing from solid to liquid at 0 degrees Celsius. The exclusive technical PCM-material that Duraflow frequently uses is based on a water/salt solution. They can melt and congeal these solutions at any desired temperature.

PCM-materials can store heat. This heat is transferred from the space to the wrapped PCM-material. The heat is being transferred from the PCM-material to the space as well. It is important that the heat exchange is established in such a way that the PCM-material changes controllably from solid to liquid and from liquid to solid. We created our own PCM-material, packaging and fill process. Our PCM is wrapped in HDPE-plastic panels. To determine the speed of charging and discharging we have created our own mathematical models. These models are subsequently re-measured in the measurement room of Autarkis in cooperation with our German PCM knowledge platform the RAL-Gütegemeinschaft to best suit each situation.


Duraflow is a 100% Dutch company that also works with 100% Dutch partners on systems which are available internationally. Duraflow and our partners are aligned with the most important PCM-knowledge institutes. We offer our products and our services as a complete package. We can install, commission and guarantee a long-lasting operation of our products at your location, under your own management. To realize this, Duraflow works together with partners. Among them are specialists in the field of consulting, installation design, interior design, control engineering, sustainability, energy supply, and outfitting and assembling.

Warranty and the life span

Duraflow conforms to a quality assurance, which is defined as the 10,000 cycles test as determined by the RAL-Gütegemeinschaft. This means that the PCM should function for 90% after 10,000 times of completely transferring from or to the PCM material. By applying more PCM, the 10,000 cycle starts with 110% PCM. Our mathematical models and tests show that with a normal application of PCM in offices, the 10,000 cycles will be reached after approximately 25 years and after approximately 100 years in data centres.


Hotsofa transforms a radiator into a comfortable seating area, creating a warm gathering spot beside the window. It’s the only sofa that makes space instead of taking it up!

Hotsofa has become an instant classic thanks to its unique design. Each sofa has its own serial number and the designer’s signature. It is Dutch Design, produced in the Netherlands and now you are able to buy your own unique sofa at Dudoc Vancouver.

As a designer, Co de Smalen is always looking for functional designs that will fill our modern lives with pleasure. And best of all is to discover a meaningful product application that nobody has yet thought of. This was the case with Hotsofa. Many people seeing the sofa for the first time can’t believe that it’s actually a novelty. That’s why Co’s design motto is: “Good things seem to have existed forever”.


Customise to 5 meters
Hotsofa fits over heating elements up to 36 cm in height. The sofa is available in three standard lengths and can be customized to fit spaces up to 5 meters. The sofa is upholstered with Kvadrat fabrics.

Classic Design
The sofa has become an instant classic thanks to its unique design. Each sofa has its own serial number and the designer’s signature. Hotsofa is Dutch Design, produced in the Netherlands.

Modulair design
Hotsofa is available in long sizes and can be fitted facing either direction. Museums, hotels, airports, offices and schools can all benefit from spacesaving seating!

Equally at home in both modern and classic interiors. The sofa can easily be moved, and is the ideal spare seat for unexpected guests. With a seat height of 45 cm, Hotsofa can be pulled right up to the dining table.

Inside out
The sofa enhances the connection to the outdoors while transforming unusable space around radiators into functional and elegant seating.

Saving costs
It can provide a new life to unsightly radiators during building renovations, thus saving costs and contributing to sustainability.

See how it works here:

One of the iconic images for Netherlands is the windmill – and now wind energy is one of the fastest growing forms of sustainable energy production worldwide.

Windchallenge, a spin-off company from the Technical University of Delft, is run by wind-energy specialists Sander and Eline Mertens. They developed a “plug and play” turbine – a new generation of small wind turbines – after four years of research and testing.

The patented Windchallenge 1.7 features blade tilt for better performance and higher reliability. It’s quiet, efficient and affordable, and can be combined with solar panels. Easily transportable, it can be set up on rooftops, lampposts or greenhouses – or for placement as a sustainable energy source for charging station for e-car, e-scooter or eBike.




The rotor diameter of the Windchallenge is 1.7 meters and the mill weighs about 10 kilograms. With its moving mast of 5 meters the total weight is about 90 kg. It can be installed without a crane and the associated high costs of producing decentralized renewable electricity. It generates around 500 kWh per year at a wind speed of 4m/s and 900 kWh per year at 9m/s. The turbine’s high-energy yield is due to the fact that the blades automatically adjust their position to the speed and direction of the wind.

The Windchallenge 1.7 could be ideal for areas in Canada that get extreme weather. The company challenged the design to see how it would operate in harsh conditions, including ice accumulation, storm and power failure and it passed all tests with flying colours according to Dutch certification for small wind turbines.

The Windchallenge 1.7 has been designed and tested in accordance with IEC 61400-12 International Certification and Dutch Assessment for small wind turbines. Additional advantages are that it can make a visible contribution to local energy, reinforce sustainability policy and involve employees in energy saving.