Assessment of the Energy Performance of building facades through different testing conditions and analysis techniques
(2018) SSB 2018 - System simulation in Buildings — Location: UNiversité de Liège (9.December.2018)
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- Abstract
- The building envelope interacts with its HVAC equipment and control, as well as with the electric grid. As the energy performance of the building envelope has a large impact on the energy costs and on the thermal comfort, being able to confirm that the predicted performance of the envelope is really achieved is an important issue. In that context, UCL is developing methods to characterize the performance of building facades, in collaboration with Jacques Delens s.a.. Those methods can be applied on site during the construction phase, requiring a maximum of 9 days monitoring period, without occupancy. Parallel experiments were conducted during summer 2017 on two pair of south oriented identical building units, including two types of boundary conditions: insulation or no insulation added on the internal side of the party walls, as well as two types of solicitations: co-heating with electric radiators at a constant set point, or free-floating internal temperature. The data are analyzed through stationary and dynamic methods in order to assess the external façade Heat Transfer Coefficient. The results highlight the relevancy of the placement of internal insulation on the party walls. Such a boundary condition do not only allows to reach higher levels of indoor temperatures. It also reduces the heat losses to neighboring units and allows to reach faster the stationary state. Without placement of internal insulation on the party walls, the stationary state cannot be reached within the imposed time period of 9 days for the experiment. When performed in apartment units, co-heating tests tend to magnify the influence of the internal thermal bridges effect, thereby leading to an overestimation of the external façade Heat Transfer Coefficient.
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Citations
Masy, G., Hincque, S., & et al. (2018). Assessment of the Energy Performance of building facades through different testing conditions and analysis techniques. SSB 2018 - System simulation in Buildings, UNiversité de Liège. https://hdl.handle.net/2078.5/58313