First Steps

The test phase of a smaller prototype that we built in Euskirchen (Germany) was followed by the review and evaluation of the collected data. Since the results proved the feasibility of the design, we decided to take the next step and build a right-sized version in our new partner city Guinea-Bissau and in collaboration with Fundação Bernd Glazinski.

To make it possible to build the right size, we had to adjust some dimensions, add reinforcements in the right places and change the materials to meet the new requirements in terms of tension and bending. The result is a denser framework in both the trapezoid and the box, as well as a new liner for the box to improve airflow and reduce turbulent airflow. The height of the chimney was also significantly reduced.

First Prototype

Working with local supporters and businesses, we had the opportunity to build the prototype in Mansôa, Guinea-Bissau, between March 11 and April 7, 2022. The construction phase proved to be more difficult than expected. However, this also showed how we can improve our construction plans and which procedures we need to adapt so that the final product is easy for everyone to build and maintain.

The current version consists of four drying racks, different sensors for temperature, humidity and even a device that measures the internal moisture of grains and corn. This allows us to vary the number of racks and the amount of material being dried to test which number is most efficient and how far we can scale the drying house. The measured values are now collected by the employees on site and frequently sent to us.

What´s next?

Once we have obtained enough data and have varied the drying options, which should be in the summer of 2022, we will proceed with the final layout for the Solardryer. The next goals are then to train local craftsmen who can take over the construction independently in the long term and to set up a functioning marketing system.