Experimental Study on Heat Transfer Process Optimization of Heat Storage Wall of the Heat Pump in Tunnel Surrounding Rock in the Cold Region

Table 1

Physical property parameters of each layer of the enclosure wall.

Material type	Thickness; (mm)	Conductivity coefficient; W/(m·K)	Heat storage coefficient; W/(m^2·K)	Heat resistance; (m^2·K)/W	Thermal inertia index
Cement mortar	10	0.930	11.37	0.011	0.12
Aerated concrete block	200	0.190	2.81	0.842	2.96
Cement mortar	21	0.930	11.37	0.023	0.26
Vertical wire rock wool	100	0.045	0.75	1.852	1.67