Conference Paper

Proceedings of eSim 2024: 13th Conference of IBPSA-Canada

Use of Imposed Boundary Conditions on Two-Dimensional Wall Assembly Models in Delphin

Robin Hilbrecht, Christopher Baldwin, Cynthia A. Cruickshank
Carleton University

Abstract: Predicting the movement of heat, air, and moisture through building wall assemblies is essential in building energy performance. While hygrothermal modelling tends to be validated with in-situ data, the motivation for this research is to develop hygrothermal models in Delphin, that can be validated with data collected from a guarded hot box using predetermined environmental conditions over a short period. This paper details the development of a 2D model in Delphin, with user defined environmental conditions. Consideration is given in simulation results and analysis for different initial boundary and surface transfer conditions, default initial conditions, and impact of different output variable elevations. While many model parameters impacted hygrothermal performance, the initial relative humidity selected was the most impactful in this paper. It was also found that the interior vapour diffusion parameters have a high sensitivity for wall assemblies without an interior vapour barrier
Keywords: hygrothermal performance, boundary conditions, Delphin, building envelope
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