Simulink and bond graph modeling of an air-conditioned room

Dynamic models of the heating, ventilation and air-conditioning (HVAC) systems in the building are very useful for controller design, commissioning, and fault detection and diagnosis. Different applications have different requirements on the models and different modeling approaches can be applied. Mathematical modeling with two different approaches, block-wise Simulink and bond graph, is discussed. Advantage and disadvantage of both approaches are expressed. It is shown that combination with two approaches to realize complicated models of building HVAC system for the application of model-based fault detection and diagnosis is a good solution.