内嵌管式围护结构频域有限差分模型的实验验证

Experimental Validation of Frequency-Domain Finite-Difference Model for Pipeembedded Building Envelope

频域有限差分(FDFD)模型可以直接快速地计算内嵌管式围护结构的频域热特性。为了验证该模型的准确性,搭建了内嵌管式围护结构的实验测试平台。采用离散傅里叶变换将实测得到的边界条件展开成复指数形式表示的傅里叶级数,并代入到FDFD模型中进行计算、求解、变换,从而得到了内嵌管式围护结构的时域热响应。FDFD模型的计算结果与实验测量结果对比表明FDFD模型能准确地计算内嵌管式围护结构的动态热特性。

The frequency thermal characteristics of the pipe-embedded building envelope can be calculated directly by using the frequency-domain finite-difference （FDFD） model. An experimental and testing platform was established to validate the accuracy of FDFD model. By the Discrete Fourier Transform, the measured boundary conditions were represented with discrete Fourier series in the complex form. Subsequently, these Fourier series were substituted into the FDFD model of the pipe-embedded building envelope for calculation. The time-domain thermal response of the FDFD model was eventually obtained. The accuracy of the FDFD model for dynamic thermal performance calculation of pipe-embedded building envelope was validated by comparing with experimental measurements.