1. Field Testing ASHRAE Guideline 26-2012
Guideline for Field Testing of General Ventilation Filtration Devices and Systems for Removal Efficiency In-Situ by Particle Size and Resistance to Airflow
Blue Heaven Technologies, Inc.
Louisville, KY

2. Who Can Do it ?

4. Issues with In-Situ Testing?
Why do In-Situ Testing?
Compare Different Products
Tests equipment under “Real World” Conditions
It’s better than just standing around
To Frustrate Others
Issues with In-Situ Testing?
Hard to Duplicate Test Conditions from test to test
Easy to Manipulate Test Conditions
Who Pays for it?

5. Basic Sampling System

6. You Must Sample Isokineticly or You Will FAIL!

7. ISOKINETIC SAMPLING
Sampling in which the flow in the sampler inlet is moving in the same direction and at the same velocity as the flow being sampled.

8. Sample Nozzle

9. Flow to Particle Counter
ISOAXIAL SAMPLING Allows for Isokinetic Sampling by adjusting flow at the sample nozzle instead of changing the nozzle size
Flow to Particle Counter
Sample Flow
Adjust Flow in this “Outer Tube” by varying the vacuum pump flow rate so the counter maintains ISOKINETIC SAMPLING.
Pump Flow

10. Iso-Axial Sample Probe

11. Upstream Sample Locations

12. Downstream Sampling Location

13. Really, This Worked at the Office?!?!?!

14. Particle Counter

15. Example Test Data – Filter 1
Size Range
(µm) D1 U1 D2 U2 D3 U3 D4
U/S Avg
D/S Avg
5634
2449
562.5
448.5
133
118.5
131.5 29 30
29.125
115.5 21
15.5
17.625 4
>5.0
8.5
5.5
0.25
Efficiency Calculations
Average
Standard
95% Upper
95% Lower
(%)
Efficiency
Deviation
Conf. Coeff. CV
Eff 1
Eff 2
Eff 3
66.43
60.08
59.27
61.93
3.920
71.67
52.19
6.33
76.79
72.50
70.89
73.39
3.046
80.96
65.83
4.15
84.16
78.87
78.01
80.35
3.330
88.62
72.07
4.14
89.21
86.51
86.22
87.31
1.650
91.41
83.21
1.89
96.44
96.92
96.66
96.67
0.243
97.28
96.07
96.71
99.02
98.48
98.07
1.209
101.07
95.07
1.23

16. In-Situ Filter Comparison

17. Air Entry to Building

18. Entry House Access

19. Pre-filter Bank Upstream

20. Downstream of Pre-Filters

21. Velocity Traverse Ports