Indoor Airborne Risk COVID-19 Estimator

	A	B	C	D	E	F	G	I	J
1	COVID-19 Indoor Infection Risk through Airborne Transmission
2	Modified Wells-Riley Model (stochastic modeling using Monte Carlo method)
3	(Simplified inputs for steady-state modeling)
4		Categories	Parameters	Values		Unit system	Notes		Inputs from users
5		Categories	Parameters	Reference	Proposed	SI Units	Notes		No need to change (automatically calculated)
6	Inputs	Virus	Strain type	Original Strain			Transmission factor: 1		Switch unit systems between SI and English units
7		Room	Type	Classroom			Set building types
8			Area	125.0	125.0	m^2	The grey cells are reference values for specific building type. The green cells are for manual inputs. If no manual inputs, the reference values will be applied, otherwise, the manual inputs will be used.	Extreme risk
9			Height	4.0	4.0	m		0.4
10			Volume	500.0	500.0	m^3		Moderate risk
11		Occupant	Total number	70	70	person		0.8
12			Infector number	1	1	person		Low but not-zero risk
13			Exposure time	8	8	hour		27.2775
14		Vaccination	Percentage of occupants vaccinated	0	80	%	56 occupants vaccinated
15		Vaccination	Effectiveness of vaccines	93.7		%	e.g. (Pfizer 2 doses): 93.7%**
16		Ventilation	Total supply air flow rate	2286.0	2286.0	m^3/hour	Total supply flow rate for entire room
17			Ventilation rate (fresh air)	15.6	Baseline	m^3/(hour*person)	Outdoor air ventilation rate for each person
18			Outdoor air fraction	47.8	47.8	%
19			Filter	MERV8	MERV8		Set filter for recirculated air
20		In-room devices	Portable air cleaner CADR	0	0	m^3/(hour*person)	None (Need to reselect CADRs when the unit system is changed)
21		Mask		No	No		Set face masks (cloth)
22	Outputs	Risk	Infection probability (unvaccinated)	18.985 (6.731)	18.985 (6.731)	%	Mean (SD), for unvaccinated occupants
23			Infection probability (vaccinated)	1.196 (0.424)	1.196 (0.424)	%	Mean (SD), for vaccinated occupants
24			New infection cases (total)	13.100	3.138	person(s)	Total infection cases among unvax & vax
25			Overall infection probability	18.985	4.548	%	= New infection cases / Susceptible number
26			Risk reduction ratio	/	76.0	%	Overall infection risk reduction of the proposed case to the reference case
27		Other parameters	Equivalent air change rate	4.29	4.29	/hour	Equivalent ACH due to HVAC, air cleaner, particle deposition, and virus inactivation
28		Other parameters	Portable air cleaner CADR for entire room	0	0	m^3/hour	Portable air cleaner CADR for entire room
29	* Reference 10, 11
30	** Reference 12
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