2.2.1. Decrement factor (f)

The decrement factor is a dimensionless factor which describes the change in amplitude of a sinusoidal heat transfer through a building component (Figure 4a), and it is generally expressed by the ratio of amplitude of temperature excitation to the value of response (Equation (10)) [26].

$$\text{decrement factor} = \frac{A\_i}{A\_c} = \frac{T\_{i,\text{max}} - T\_a}{T\_{\varepsilon,\text{max}} - T\_a} \tag{10}$$
