Paper Conference

Proceedings of Building Simulation 2017: 15th Conference of IBPSA


Building Simulation 2017: “Determination of Heat Flux Coefficient Inquiry Methods for City District Simulation”

C. Fliegner, M. - A. Brüntjen, Dr.-Ing J. Frisch, Prof. Dr.-Ing C. van Treeck
Lehrstuhl für Energieeffizientes Bauen (E3d)-RWTH - Aachen, Germany

Abstract: This paper deals with work within the RWTH Aachen University “EnEff: Campus - RoadMap RWTH Aachen” (EnEff:Campus) project aiming at developing a systematic road map towards a cost-effective reduction of the primary energy consumption of the complete campus. The project follows a systematic approach for deriving low-order dynamic building and distribution network energy performance models from a geo-information data base. Since the thermal transmittance of the buildings’ enveloping surfaces is barely known, various methods for U-value determinations are applied and refined due to insufficiencies of current approaches. One developed approach builds on the fact that the surface appearance of a building allows conclusions about the U-value. Another one works with heat flux sensors and derives physical quantities of a wall from temperature gradients. The goal of this paper is to combine these methods for enabling a more precise determination of heat transfer coefficients.
Pages: 1185 - 1193