Abstract
Conduction transfer function (CTF) is widely used to calculate conduction heat transfer in building cooling/heating load and energy calculations. It can conveniently fit into any load and energy calculation techniques to perform conduction heat transfer calculations. There are two popular methods, direct root-finding (DRF) method and frequency-domain regression (FDR) method to calculate CTF coefficients. The limitation of methodology possibly results in imprecise or false CTF coefficients. This paper analyzes the errors of two methods to the material properties of a multilayer heavyweight building construction. The results show that the calculation error of DRF method becomes increasing as the wall characteristic parameter becomes increasing. The maximal error even reaches almost 100%. However, the calculation error of FDR method always remains within 1% no matter how the wall characteristic parameters are varied. Thus, FDR method is more robust and reliable than DRF method.
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