Thread by @masknerd

[1]Far-UV Air disinfection performance testing standards
Wladyslaw Kowalski, Sanuvox
#ICFUST
#ICFUST2023

[2] Opening with ASHREA 241P, target for 4-6 ACH, also opens door to eACH considerations which is good.
How do compare tech?
Watts/eACH?
$/eACH?
Risk/eACH?
Note uses EAC(but I am going to use eACH since I feel we see that more).

[3] Performance standards can be use to determine eACH. Going through in-duct performance, and is fairly straight forward to convert to eACH.
In room standards:
AHAM AC-5, ASTM, ASHREA[too fast for me to type all]

[4] Moved to the completely mixed outside air model and transient decay rate. NIOSH published Table S3-1 decay rate to covert to eACH.
Steady state is other method, using room removal rate per minute. Mutchler 1974 and CDC/NIOSH 1994 has table

[5] Two type of UV systems, in-duct and in-room. In in-room UV systems. How to do in room performance measurements? Rooms don't act like ducts, there is mixing, and non-uniform flow fields and this effects performance. Can get ranges of performance but exact values tough.

[6] Well 1938 first decay test of an Upper Room system.
Looked at decay of E. coli in room, transient decay with constant source, no airflow. Collected multiple points of decay, and can convert to 1.67 eACH/

[7] Looking at other examples from literature to get converted eACH(as they often just showed curves in older prior work), showing variety of data and summarized to get ranges of data. Ranges are wide but higher ACH reduced UV, turning into more like a duct.

[8] Many installs would meet the new ASHREA 241P standards.