Paper Conference

Proceedings of Building Simulation 2017: 15th Conference of IBPSA


A Study of the Effect of Model Resolution in Analysis of Building Thermal Dynamics

Ali Saberi Derakhtenjani1, Andreas K. Athienitis1
1Department of Building, Civil and Environmental Engineering Concordia University, Montreal, Quebec, Canada

Abstract: This paper presents a study of the effect of model resolution of thermal networks with different level of detail for a zone with a floor heating system. It is investigated how different model resolutions affect the floor heating load calculation. Also, the frequency response analysis of different building thermal network models is presented. A lumped parameter finite difference model is used to model an office building with radiant floor heating system. It is investigated how different assumptions applied in such a model affect the floor heating load calculation. Then, derivation of the floor admittance transfer functions (for 1-D heat transfer) is presented (for the exact theoretical solution as well as the RC model estimation). The admittance transfer functions of the lower order RC models are compared with the ones obtained from the exact theoretical solution. It is demonstrated how an optimization technique can help in obtaining the effective RC circuits parameters to match the frequency response of the RC models transfer functions with the one from the theoretical solution. Finally, it is observed that for building materials with higher thermal mass, higher order models are needed so that to model a slab accurately while the low order RC circuit parameters make physical sense.
Pages: 1622 - 1630