Paper Conference

Proceedings of Building Simulation 2017: 15th Conference of IBPSA


Model-Based Control of a Hydronic Radiant Slab for Peak Load Reduction

Vasken Dermardiros1, Charalampos Vallianos1, Andreas K. Athienitis1, Scott Bucking2
1Concordia University, Montreal, QC, Canada
2Carleton University, Ottawa, ON, Canada

Abstract: This paper presents a model and model-based predictive control (MPC) methodology for a hydronic radiant slab system for an archetype zone that allows deep daylight penetration and cross ventilation. The methodology is applied to a cold-climate case study, the Varennes library, located near Montreal, Quebec (Canada’s first institutional net-zero energy building). We used an implicit finite difference based approach to model the heat transfer in the room and slab. The work presented lays the groundwork for the future implementation of MPC into the library and for archetype-based studies for controls. Conventionally, hydronic radiant slabs are controlled through inlet-oulet temperature differentials and based on ambient conditions correlations. Predictive measures are seldom applied which can be beneficial for peak demand reduction and shifting. The MPC algorithm here replicates a pre-cooling strategy in anticipation of mid-day solar gains. However, the effectiveness of the hydronic slab is greatly influenced by its covering favouring low thermal resistance. The methodology can be extended for other storage mediums and fine-tuned for the specific cost and performance needs of the project.
Pages: 1815 - 1823