Experimental Study on the Smoke Temperature Decrease near Natural Vents Induced by Air Entrainment in a Tunnel Fire

Table 1

Parameters for the Boltzmann fitting formula with different HRRs (shaft height: 0.6 m).

HRR (kW)	Parameters	Value	Standard error	HRR (kW)	Parameters	Value	Standard error
9	A1	35.25851	0.99255	29	A1	50.16493	2.04516
	A2	104.41655	2.71589		A2	205.73656	6.89213
	x0	0.59809	0.00357		x0	0.59329	0.00423
	dx	0.01649	0.00357		dx	0.0242	0.0033
	Span	69.15804	2.97747		Span	155.57163	7.42004
	EC50	1.81864	0.0065		EC50	1.80993	0.00766
17	A1	40.5918	1.42156	65	A1	55.70028	5.1981
	A2	146.70394	3.91254		A2	298.58911	22.61845
	x0	0.59619	0.00344		x0	0.56768	0.01228
	dx	0.01736	0.00307		dx	0.04494	0.00903
	Span	106.11214	4.27226		Span	242.88883	24.67202
	EC50	1.8152	0.00624		EC50	1.76417	0.02166