Conference Paper

Proceedings of ASim Conference 2016: 3rd Asia conference of IBPSA-China, Japan, Korea

THERMAL AND OPTICAL MODELING OF COMPLEX FENESTRATION SYSTEMS WITHIN THE CONTEXT OF BUILDING INFORMATION MODELING

M. Boudhaim, T. Pflug, B. Bueno, M. Siroux, T. Kuhn

Abstract: Building Information Modeling (BIM) is a process involving the generation and management of numerical representations of physical and functional characteristics of building components. This process involves file formats that can be exchanged or networked to support decision-making, avoiding redundancy and miscommunication, which often lead to non-optimized and non-efficient solutions. Although significant effort has already been devoted to the BIM representation of the building skeleton construction, the energetic and comfort aspects of the building skin are not yet fully represented in BIM. This paper will focus on the thermal modeling of complex fenestration systems (CFS). The way of calculating the thermal properties and heat transfer of CFS in detailed building simulation programs is to represent it with a layer-by-layer nodal model such as in ISO15099. While this type of thermal models is accurate for conventional glazing systems such as for example double and triples glazing, it requires strong assumptions in the case of three-dimensional structures (e.g. venetian blinds) and porous layers. Semi-empirical models, in which the complexity of a system is captured by one or various experiments, constitute an alternative to layer-by-layer heat transfer models. Kuhn et al. presented a “Black-Box” model to predict solar gains through CFS in building simulation programs. The model requires angularly resolved solar heat gain coefficients, solar transmittance and U-value, which can be analytically derived or obtained through calorimetric measurements. The model then encapsulates the CFS complexity by a two-layer approach. A method was also proposed to calculate the angularly resolved solar heat gain coefficients of systems composed of two subsystems. In this contribution, we propose a global methodology to include the properties of the two subsystems in an extended version of the IFC standard description and a standard methodology to assess building’s performance.
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