Retrotec USACE User Manual
Page 318
F24 ENERGY & PROCESS ASSESSMENT PROTOCOL
5
Perform a Multipoint Depressurization Door Fan Test
Testing in both directions is the preferred method, but if in section 4.6 if it was noted that the test was to be
performed in only one direction, then step 5 can be omitted.
5.6
Record the amount of time taken to collect each Building Pressure Test
Point.
sec
5.7
Record 12 Bias Pressure Test Points in exactly the same fashion as step 4.4.
Bias Pressure
Test Points
1
2
3
4
5
6
7
8
9
10
11
12
Pa
Pa
Pa
Pa
Pa
Pa
Pa
Pa
Pa
Pa
Pa
Pa
5.8
Calculate the Average Bias Pressure for all 24 Test Points taken in step 5.
Pa
5.9
Subtract value in 5.8 from all pressure readings taken in 4.6. This is the total corrected building pressure used
in the analysis. See step 6.
6
Calculate and Report Results
Subtract the Average Bias Pressure from all Building Pressures to arrive at Corrected Building
Pressure. Curve fi t pressures and fl ows from the tables and calculate the following values in strict accordance with
ASTM E779-03. Provide tabulated and graphical data as an attachment to this test form.
Pressurization
6.2
The air leakage coeffi cient C
p
for
L/s*Pa
n
(CFM/Pa
n
)
6.3
The exponent n
p
for pressurization.
(NOTE: if n
p
is less than 0.5 or greater than 1.0, test data is invalid and test must
be repeated.)
6.4
CFM referenced to standard temperature and pressure (STP) at +75 Pa.
L/s (CFM)
6.5
L/s *m
2
of envelope @ 75Pa or CFM/sq ft @ 0.3 in. w.g.
L/s *m
2
@75Pa or cfm/
sq ft @0.3 in.w.g.
6.6
The correlation coeffi cient, r
2
, of the curve fi tted data with a minimum of 12 points.
(NOTE: if r
2
is less than 0.95, test data is invalid and test must be repeated.)
6.7
Calculate the 95% confi dence interval at +75 Pa for test in pressurization.
(NOTE: if confi dence intervals exceed +/– 0.025 of the value in 6.4, test data is
invalid and test must be repeated if the value in 6.4 is 0.25 or less. If the value is
greater than 0.25, the confi dence interval must not exceed +/– 10% of the value in
6.4).
L/s *m
2
@75Pa or cfm/
sq ft @0.3 in.w.g
Depressurization
6.8
The air leakage coeffi cient C
d
for depressurization.
L/s per Pa
n
or CFM/Pa
n