Table 3. Attenuation Coefficient and Delay Time Calculation Results of Different Structural Walls.

wall structure	amplitude of the temperature wave at the surface of the wall (°C)	attenuation multiple	delay time (h)
embedded phase change energy storage wall with a tube spacing of 20 mm	2.14	3.76	8.5
embedded phase change energy storage wall with a tube spacing of 40 mm	2.24	3.60	6.2
embedded phase change energy storage wall with a tube spacing of 60 mm	2.45	3.29	4.6
masonry wall that did not contain any phase change energy storage tubes	2.74	2.94	2.3