Office building Frankrijklei 71

Client: AG VESPA
Location: Antwerp
Timing: 2011
Status: realized

Technical renovation support I Energetic renovations

Feasibility investigation for the renovation of an office building located on the Frankrijklei in Antwerp into a passive building.

The study's objective was to determine the interventions and to estimate the investment costs for a renovation of the building into a passive building.
The explicit request of the client was to look at the assignment "integrally": not only the energy-economizing improvements needed to be determined, but also interventions that would guarantee the desired interior comfort, improve the (fire) safety and that were architecturally and structurally necessary.

In the first part of the study, the current state of the building was mapped. In addition to determining the different structures of the envelope part, thermographic (infrared) recordings of the building were made to localize the thermal bridges. These were simulated with TRISCO-software to determine the impact on the overall heat transfer of the envelope part.
Then, the fire safety, acoustics and the existing technical installations of the building were assessed. The present concrete degradation in the underground car park was also mapped.

Secondly, the necessary packages were assembled to meet the demands of a passive office building. Besides limiting the heat losses, an opinion was drawn up regarding the necessary techniques to give the building the desired interior comfort, for which we used software developed by the Passive House Platform. Sun protection, new energy-efficient lighting, a performant ventilation system and night ventilation proved to be necessary to achieve the desired interior comfort.

To meet the requirements, different thermal bridges were also calculated in detail and the necessary measures were proposed to minimize heat loss and to prevent condensation and mould.

Regarding the fire safety aspect, a meeting with the Antwerp fire brigade took place in order to draw up a concrete package of requirements.

Finally, an estimate was made for the cost of all the different interventions.