Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Thermal Bridge Modeling According to Time-varying Indoor Temperature for Dynamic Building Energy Simulation Using System Identification

Version 1 : Received: 20 July 2022 / Approved: 21 July 2022 / Online: 21 July 2022 (08:40:55 CEST)

A peer-reviewed article of this Preprint also exists.

Kim, H.; Kim, J.; Yeo, M. Thermal Bridge Modeling According to Time-Varying Indoor Temperature for Dynamic Building Energy Simulation Using System Identification. Buildings 2022, 12, 2178. Kim, H.; Kim, J.; Yeo, M. Thermal Bridge Modeling According to Time-Varying Indoor Temperature for Dynamic Building Energy Simulation Using System Identification. Buildings 2022, 12, 2178.

Abstract

It is not easy to dynamically analyze thermal bridges that require multidimensional analysis in building energy simulations, which are mostly one-dimensional platforms. To solve this problem, many studies have been conducted and, recently, a study was conducted to model the thermal bridge based on the data by approaching this in a similar way to steady-state analysis, showing high accuracy. This was an early-stage study, which is only applicable when the indoor temperature is constant. By extending this study, a thermal bridge model that can be applied even when the indoor temperature changes over time is proposed and validated. Since the governing equation, the heat diffusion equation, is linear, the key idea is to create and apply two thermal bridge transfer function models by expressing the heat flow entering the room as a linear combination of the transfer function for indoor temperature and the transfer function for outdoor temperature. For the proposed thermal bridge model, the NRMSE of the model itself showed a high accuracy of 99.9%, and in the verification through annual simulation using the model, the NRMSE showed an accuracy of 88.8%.

Keywords

thermal bridge; data-driven system modeling; system identification; time-varying indoor temperature; dynamic analysis; building energy simulation; building envelope

Subject

Engineering, Architecture, Building and Construction

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