The future of construction Is biobased. In the Bio-Iso project, part of the Biobased Construction research group at HZ University of Applied Sciences, groundbreaking steps have been taken to develop biobased façades. Moreover, the next generation of builders has been inspired.
Healthy living starts with a healthy indoor climate. International studies have shown that biobased insulation products can significantly contribute to a healthier indoor climate. Unlike synthetic and mineral products, these materials possess thermohygroscopic properties, meaning they can absorb, retain, and release heat and moisture.
In the Dutch construction sector, there is little validated knowledge available about applying biobased materials in façades. In the Bio-Iso project, which began in October 2020, biobased insulation materials were scientifically tested in various combinations. Thanks to their proven beneficial properties, producers of these materials can distinguish themselves in both existing and new markets.
Indoor and Outdoor Climate Chambers
To conduct the tests, researchers developed special climate chambers in the most sustainable way possible. Two repurposed shipping containers were used as climate chambers. These containers simulated indoor and outdoor climate conditions simultaneously. Façades made of biobased material were constructed between the containers, which are mounted on a rail system, and were thoroughly examined.
The setup also included a humidification, drying, and heating unit, along with ten TDR sensors that measure volumetric moisture content. These sensors recorded how much moisture the material absorbed and released over time and under various relative humidity levels. This provided valuable insights into the materials' temperature and moisture-regulating properties, resulting in validated performance data. This data enables builders to determine optimal construction methods for applying these materials effectively.
A Forced Relocation
Initially, the containers were stationed at Avans University in Den Bosch. In 2022, they had to be relocated and found a new home at Innovatiepunt KAAP in Vlissingen. This former industrial warehouse hosts multiple innovative companies and organizations testing their developments. Here, the containers were housed indoors, reducing the influence of external factors and requiring less energy to maintain the desired temperatures.
Project Conclusion and Beyond
Bio-Iso will conclude on February 15, 2024, with a closing event. Visitors will be able to view the successfully implemented setup, and researchers will elaborate on its various applications. During the project, knowledge institutions, producers, and users collaborated, supported by organizations like Bouwend Nederland and relevant standards committees. New values and knowledge regarding biobased materials, such as thermal conductivity, water absorption, moisture buffering capacity, and volumetric moisture content, were shared with project partners. A document compiling these findings provides producers and chain partners with tools for designing and constructing more sustainable and comfortable buildings. The results of Bio-Iso have also been integrated into educational activities.
A potential follow-up project aims to compare results achieved in the climate chambers with those observed in real-world applications. The research group has already found partners willing to collaborate on practical tests.
