Table 4.

Comparison of Lagrangian modeling and EPA experiment (600/R-06/051) measurement.

Microorganisms	Z value (m−2·J)	Average UV dose Davg (J·m−2)				Disinfection efficacy η (%)
		EPA [49]	Ref. [50]	Ref. [42]	Present	EPA [49]	Ref. [42]	Present
S. marcescens	0.92	–	18b	–	–	99.8	99.99	100
MS2 bacteriophage	0.038–0.048	–	18b	15.82c	16.63c	46	49.35	54.43
B. atrophaeus	0.016	2.95a	18b	15.82c	20.36c	0	13.68	0.00

^aCalculated by D_avg = lnF_s/Z, where D_avg was average UV dose, F_s was the survival fraction of airborne microorganisms, Z was Z value of airborne microorganisms.

^bCalculated by D_avg = I_ravg·t_f, where I_ravg was average spatial irradiance of whole duct, t_f was the time particle pass through duct, t_f = V/Q, where V was the volume of duct, Q was air flow rate.

^cCalculated by D_avg=(D₁+D₂+ … +D_i)/n, where n was the total number of particles sampled in outlet plane, D_i was the UV dose of particle i.