A new order reduction method for dynamic heat transfer model of building envelope

Abstract

The invention discloses a new model reduction solution method for building envelope dynamic heat transfer. Aiming at building dynamic heat transfer problem, based on heat balance principle, a controlequation for building envelope dynamic heat transfer is established. According to the indoor and outdoor meteorological parameters and the thermal performance parameters of the envelope, the characteristics of the partial differential equation are analyzed, and the boundary conditions and initial conditions are established. By using the robust discretization method, the discretized state space form of the original system of the partial differential equation is obtained. Based on Laguerre orthogonal polynomials, a new model reduction method is proposed for the original system. Finally, the solution of the reduced order system is restored to the solution of the original system. Compared with the Krylov subspace model reduction method, the new method is more intuitive and simpler in time domain. Compared with the balanced truncation model, the computational resource consumption is reduced. The eigenorthogonal decomposition (POD) model reduction method is avoided to obtain the data set ofthe system state in advance.

Description

technical field [0001] The invention belongs to the technical field of building performance simulation, and relates to a fast and accurate solution method for numerical simulation of building dynamic thermal performance, in particular to a new model reduction solution method for dynamic heat transfer of building envelope structures. Background technique [0002] In the formulation of building thermal environment control schemes and system design, accurate assessment of building energy consumption throughout the year, and construction of dynamic building information models (BIM), it is urgent to accurately and quickly calculate the dynamic transmission of the building envelope at any time of the year. Heat and its temperature distribution. Although many softwares can calculate building dynamic energy consumption, such as BLAST, DOE-2, EnergyPlus, ES, TRNSYS, DeST, etc., due to different calculation methods, the calculation results of different building energy consumption simu...

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Problems solved by technology

[0004] Although conventional model reduction methods have been preliminarily discussed in the field of building performance simulation, they are still immature. Therefore, for building dynamic heat transfer problems, it will be helpful to find a new model reduction method with superior performance and less calculation. advances in building technology

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