Client: Universitair Ziekenhuis Gent
Advisors: UGent (in situ air tightness measurements), Daidalos (acoustics)
Technical renovation support I Energetic renovation
Analysis of the façades of three buildings “K12 A, B and E” located on the campus of Ghent University Hospital at De Pintelaan, Ghent with regard to a future façade renovation.
The study's objective was to develop a vision
for a future façade renovation.
The key questions were:
- To what extent do the façades comply with the current standards and requirements in terms of energy loss, safety & comfort (VIPA)?
- And within the context of the BEN-demands (Almost Energy Neutral Building) which will come into force in 2019?
- With these future performance criteria in mind: which options can be chosen today for a façade renovation?
The first part of the study consisted of a thorough assessment of the thermal performance of the façades dating from the 70s, including air-tightness measurements, thermography, TRISCO-simulations (thermal bridges) and calculations of U-value and K-level. The study showed that the existing façades – in spite of the insulation layer – performed poorly due to the presence of numerous thermal bridges. Furthermore, data was also collected regarding the structural condition, concrete quality, façade detailing and acoustic performance.
The results were used in the second part of the study for the calculation of the overall energy consumption for heating and cooling on an annual basis, and for the analysis of the comfort in a hospital room.
Causes for discomfort due to drafts, cold radiation and overheating were investigated in detail, as well as day-lighting, safety, acoustic and visual comfort.
The sun (heat) entrance and overheating issues were analysed using dynamic simulations over a period of 6 months (May – September). This analysis clearly showed that the existing situation caused a few problems because the current building envelope performed so poorly in terms of air tightness. In other words, renewing the windows and optimising the air tightness could create an overheating problem.
In the last part of the study, 5 different options for a façade renovation were extensively discussed and the investment costs budgeted. In this study, the return on investment in time, were not calculated.
This study has been presented at the NZEB Symposium Passive and Beyond and the 6th International Congres Building Physics in Turin.