ASHRAE Journal - June 2022 - 39

TECHNICAL FEATURE
TABLE 3 Tracer gas concentrations under different testing conditions.
INSTRUMENT TYPE
Electron Capture
Detector (ECD)
TRACER GAS
LEAKAGE CONCENTRATIONc
Gas Chromatograph-
Discharge Ionization
Detector (GC-DID)
Gas Chromatograph-
Thermal Conductivity
Detector (GC-TCD)
Electron Capture
Detector
TRACER GAS
LEAKAGE CONCENTRATIONd
Gas Chromatograph-
Thermal Conductivity
Detector
Non-Dispersive
Infrared (NDIR)
Spectroscopy
INFLUENTIAL FACTOR
SAMPLING POINT
Bottom center of
the sash
Bottom center of
the sash
Bottom center of
the sash
Bottom center of
the sash
Bottom center of
the sash
Bottom center of
the sash
4 L/m,
NO THERMAL LOAD
NDa
-
-
0.32 ppm
0.2 ppm
-
4 L/m,
100°C
ND
-
-
0.38 ppm
0.2 ppm
-
4 L/m,
200°C
ND
NDb
8 L/m,
200°C
4.5 ppm
-
-
1.1 ppm
0.48 ppm 12.09 ppm
0.7 ppm
-
-
19.32 ppme
a ND, non-detectable by ECD (below 10 ppb).
b ND, non-detectable by GC-DID (below 100 ppb).
c Concentration values were obtained when the small clutter was placed inside of fume hood (from previous
study by Chen, et al.10).
d Concentration values were obtained when the large clutter was placed inside of fume hood.
e Concentration values were obtained using an infrared spectrophotometer.
There are some recognized challenges
or limitations in the present
research that could be addressed
in future work. Regarding the
experimental equipment, the
thermostatic heaters used in this
study can represent one specifi c
thermal load, but in real laboratory
environments there are various
heating devices, including but not
limited to Bunsen burners and oil
baths, that may produce different
heat transfer characteristics.
Different types of thermal loads
could be introduced in order
to analyze their impacts on the
robustness of face velocity. In
addition, it would be worthwhile to
expand the scope of tracer gas testing
data collection and to involve more fume hoods of
different types and brands, which would reduce the
0.60
0.55
0.50
0.45
0.40
0.35
0.30
FIGURE 7 Average face velocities at upper, middle and bottom rows of the fume hood airflow inlet under different
scenarios of influential factors.
Avg. Face Velocity Values (Upper Row)
Avg. Face Velocity Values (Middle Row)
Avg. Face Velocity Values (Bottom Row)
Various Infl uential Factors in the As-Used Condition
sampling error and enhance the comprehensiveness of
the testing.23
J U N E 2 0 2 2 ashrae .o rg ASHRAE JOURNAL
39
Average Face Velocity Values (m/s)
Small Clutter, 4 L/m
Small Clutter, 4 L/m, 100°C
Small Clutter, 4 L/m, 200°C
Small Clutter, 8 L/m, 200°C
Large Clutter, 4 L/m
Large Clutter, 4 L/m, 100°C
Large Clutter, 4 L/m, 200°C
Large Clutter, 8 L/m, 200°C

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ASHRAE Journal - June 2022

Table of Contents for the Digital Edition of ASHRAE Journal - June 2022

Contents
ASHRAE Journal - June 2022 - Intro
ASHRAE Journal - June 2022 - Cover1
ASHRAE Journal - June 2022 - Cover2
ASHRAE Journal - June 2022 - 1
ASHRAE Journal - June 2022 - Contents
ASHRAE Journal - June 2022 - 3
ASHRAE Journal - June 2022 - 4
ASHRAE Journal - June 2022 - 5
ASHRAE Journal - June 2022 - 6
ASHRAE Journal - June 2022 - 7
ASHRAE Journal - June 2022 - 8
ASHRAE Journal - June 2022 - 9
ASHRAE Journal - June 2022 - 10
ASHRAE Journal - June 2022 - 11
ASHRAE Journal - June 2022 - 12
ASHRAE Journal - June 2022 - 13
ASHRAE Journal - June 2022 - 14
ASHRAE Journal - June 2022 - 15
ASHRAE Journal - June 2022 - 16
ASHRAE Journal - June 2022 - 17
ASHRAE Journal - June 2022 - 18
ASHRAE Journal - June 2022 - 19
ASHRAE Journal - June 2022 - 20
ASHRAE Journal - June 2022 - 21
ASHRAE Journal - June 2022 - 22
ASHRAE Journal - June 2022 - 23
ASHRAE Journal - June 2022 - 24
ASHRAE Journal - June 2022 - 25
ASHRAE Journal - June 2022 - 26
ASHRAE Journal - June 2022 - 27
ASHRAE Journal - June 2022 - 28
ASHRAE Journal - June 2022 - 29
ASHRAE Journal - June 2022 - 30
ASHRAE Journal - June 2022 - 31
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ASHRAE Journal - June 2022 - 33
ASHRAE Journal - June 2022 - 34
ASHRAE Journal - June 2022 - 35
ASHRAE Journal - June 2022 - 36
ASHRAE Journal - June 2022 - 37
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ASHRAE Journal - June 2022 - 72
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ASHRAE Journal - June 2022 - Cover4
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