UVC Dose Calculator

UVC Dose Calculator Introduction

If you are looking to have a UVC disinfection chamber for treating air this handy little calculator enables you to work out the dose of UVC that presented to the passing airflow.

Input the dimensions of the chamber, the airflow, and the UVC light source intensity and the results will tell you the volume of the chamber, the dwell time of the air passing through the chamber and most importantly, the UVC dose in μWSec/cm²

The UVC Dose Calculator results will need some interpretation.
In broad terms, the higher the dose imparted to the passing air, the more effective the UVC chamber will be at deactivating the microorganisms on the air flow. But it is important to realise that there are other factors that affect the efficiency including;

• What the micro organism actually is
• What the temperture of the airflow is
• What the chambers material of construction is

For general, and unspecific UVC treatment of air the following scale provides some guide on the effectiveness of the chamber

8000 μWSec/cm² - excellent
6000 μWSec/cm² - very good
4000 μWSec/cm² - good
2000 μWSec/cm² - ok
1000 μWSec/cm² - marginal
500 μWSec/cm² - not worth installing

chamber volume:	m3
flow converted:	m3/s
Dwell time:	seconds
Dose:	μWSec/cm²

Heat Load	Watts	BTU
Average The Room Is A Normal Residential Room, Office, Reception Area Or Similar, Where There Is Not Overly Crowded With People, Computer And Office Equipment.
Above Average There Are Factors That Contribute To Additional Heat Being Generated In The Room E.G. Strong Lighting, Overcrowding With People And Office Equipment, Conservatory Type Room, Or Flat Roofed Room.
High There Are Factors That Contribute To A High Heat Load In The Room. E.G. Commercial Cooking, Much Computer And Server Equipment, Switchgear, Temporary Building With Thin Walls And Flat Room, Plain Glass Conservatory.

Variable	Units	Notes/Guidance
System Airflow	M3/Hr	If you have it in cfm then multiply your cfm value by 1.7 to get m3/hr
Average Combined Pressure Drop Of Filters Of Higher Than F6 Efficiency	Pascals	F8 bag filters pressure drop - typical clean clean to dirty, 160 - 250 Pascals F9 compact filters pressure drop - typical clean to dirty, 160 - 350 Pascals H10 HEPA filter pressure drop - typical clean to dirty, 250 - 600 Pascals 9.8 Pascals = 1 mm wg, & 249 Pascals = 1 inch wg
Carbon Filters Pressure Drop	Pascals	For compact type carbons pressure drop between 100 - 150 Pa Bonded carbon panels typically 150 - 170 Pa Loose granular carbon panels typically 130 Pa
Annual Operational Hours	Hrs/Annum	8760 hours in a year If operating for 5 days a week, excluding public holidays, for 12 hrs/day = 3000 hrs
Cost Of Power	Pence Per Kwh	Huge variance in what different companies pay. heck your last bill to be sure, otherwise put in 10p
Fan Efficiency	(As Decimal Value, Eg 100%=1)	Would typically be around 60%, so if you don’t have specific information use 0.6
Fan Motor Efficiency	(As Decimal Value, Eg 100%=1)	Larger motors should be around 90%, so if you don’t have specific information use 0.9

The Total Average Pressure Drop Over Your Higher Efficiency Filters And/Or Carbon Filters Is;		Pascals
This Pressure Drop Is Costing In Energy Alone	£	Per year
It Is Probable That A Sanuvox In-Duct System Could Break Down The Biological, Chemical And Odourous Contaminants On This Air Flow For Between 16 And 25% Of This Running Cost	£	Lower energy cost estimate of an equivalent Sanuvox system (16%)
	£	Higher energy cost estimate of an equivalent Sanuvox system (25%)

Type Of Building	Kw Range		BTU Range
Sports Centres
Retail Premises
Office Premises
Small Industrial Unit
Medium Industrial Units
Larger Industrial Buildings
School/Community Halls
Churches

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Room/building volume	m3
Temperature differential (deltaT °C)	°C