Performance assessment of TIM-envelopes

During the past two decades, pressure on the building industry increased gradually. Energy effi-ciency, indoor air quality, comfort, durability, sustainability all became key issues within a framework of growing cost awareness. Hence, this multiplication of issues emphasized the need for a new methodology to assess building quality, called the performance concept. This paper uses performances to evaluate an advanced building envelope system: transparent insulation (TIM).

Results from a validated CFD simulation of a supply air "ventilated" window.

A currently unresolved problem in building design is the paradox between increasing demand for good thermal insulation, and the requirement for ample levels of ventilation, to maintain a healthy indoor environment. A possible solution to this problem is a supply air 'ventilated' window. This utilises an airflow between panes to pre-heat ventilation air to the building, and to reduce thermal convection losses, thus reducing the window Ue-Value.