I have a AHU system and I am trying to establish the system performance. I actually
Have not got too much experience in AHU.


i visited some website and downloaded some software .Absolutely superb. Now trouble is that i need to know a bit more in order to be able to use it properly. I bought myself a velocity meter (digital) and it reads RH %
dry bulb, velocity fpm.I tried it on Rheem system about 14-15 kw.
I got at some grilles 360 fpm, 30’C supply temp and 44 % RH. In the room the
set temp is 25 and it reached 23 without a problem and I had a 100 fpm at some other grilles and supply 23’C.Question is How to get more calculations and apply it to the software so i can get a proper results.
Read somewhere to use a measuring tape which is i presume to measure the duct size and then if i know the area, the system kw,the RH,the dry bulb, wet bulb
so how can i apply this formulae. I prefer sometimes formulas in order to understand better instead of only software which will do the maths but actually it won't show me how it is done. Also i read somewhere about the formulae calculations about round duct ...Area x r (3.14) x r (3.14)

one more Q Is there any filters in the systems so i can clean them?