Kanomax 2212, User Manual, Page: 17 / 52

5. Measuring Percent Outdoor Air 14
5. Measuring Percent Outdoor Air
(%OA MODE)
%OA MODE is a measurement mode to calculate Percent Outdoor Air either with temperature or CO
2
.
The calculation is based on below formula:
%OA
＝
(R_A – S_A) / (R_A – O_A) × 100
* %OA
：
Percent Outdoor Air
R_A
：
Temperature or CO
2
concentration of Return Air
S_A
：
Temperature or CO
2
concentration of Supply Air
O_A
：
Temperature or CO
2
concentration of Outdoor Air
A measurement takes place in the following sequence;
Return Air -> Supply Air -> Outdoor Air
Average value in each point is used to calculate percent outdoor air.
Temperature or CO
2
concentration data at each point (TRIAL(1) ~ TRIAL(N)) will be also stored in the memory.
TRIAL (1) (2) (3)……(N) TRIAL (1) (2) (3) ……(N) TRIAL (1) (2) (3) …… (N)
Time required to measure at each point --- Sampling Time × N ( Number of Trial)
Return Air (R_A) Supply Air (S_A) Outdoor Air (O_A)
Return Air : R_A=ΣTRIAL(N)/N
Supply Air : S_A=ΣTRIAL(N)/N
Outdoor Air : O_A=ΣTRIAL(N)/N
<Calculation Result>
* Percent Outdoor Air (%OA)
%OA = (R_A - S_A) / (R_A - O_A) x 100
Outdoor Air (O_A)
Return Air (R_A)
Supply Air (S_A)