ASHRAE Journal - April 2020 - 30

TECHNICAL FEATURE

Gas heater use was also monitored
during the same weeks with Table 3
summarizing use when the fan was off,
and Table 4 summarizing use when the
fan was on.
The HVLS fan created indoor air
temperature uniformity in the facility, reduced heat loss from the building and caused the heaters to operate,
consuming less natural gas. Gas prices
are based on November 2018 data provided by the U.S. Energy Information
Administration for commercial supply at $7.69 per thousand cubic feet
($0.272 per cubic meter). The total
cost of natural gas was $277 with average use of 465 ft3/heating degree day
(13.2 m3/heating degree day) while
the fan was off. By comparison, the
total gas cost was $191 with the average use of 330 ft3/heating degree day
(9.3 m3/heating degree day) when the
fan was on. Overall, while the fan was
operational, a 29% decrease in the
normalized gas use was experienced.
Based on an estimated annual 4,500
30

ASHRAE JOURNAL

ashrae.org

65

60

55

50
8:32p

8:35p

8:38p

8:41p

8:44p

8:47p

8:49p

8:52p

8:55p

8:58p

November 9
35 ft AFF

15 ft AFF

5 ft AFF

Outside Air

FIGURE 7 Indoor temperature conditions showing thermal air stratification over time after the fan was turned
off from November 16 at 7:45 a.m. to 8:00 a.m.
75
Fan On
Fan Off
Stratification
Re-Established
70

Indoor Air Temperature (°F)

Gas Consumption

Indoor Air Temperature (°F)

unsteady state mixing conditions caused by the
TABLE 2 Stratification results while fan was operational showing daily average temperatures from
5 ft, 15 ft and 35 ft (1.5 m, 4.6 m and 10.7 m) away from floor with outside air conditions for
fan and finally the near uniform temperatures
comparison. Temperature differentials from 35 ft (10.7 m) and 15 ft (4.6 m), and 35 ft (10.7 m)
across all recorded heights. Beginning at 8:40
and 5 ft (1.5 m) are shown.
p.m. on November 9, only 10 minutes of mixing
FAN ON
35 FT
15 FT
5 FT
OA
DT (°F)
were required for the temperature difference to DAILY AVERAGES TEMP. (°F) TEMP. (°F) TEMP. (°F) TEMP. (°F) 35 FT - 5 FT 35 FT - 15 FT
fall within 1°F (0.6°C).
Nov. 10
67.8
67.4
67.2
59.1
0.6
0.4
Figure 7 shows the amount of time after the fan
Nov. 11
66.4
66.2
66.0
54.7
0.4
0.2
was turned off for the indoor temperature to
Nov. 12
65.9
65.7
65.1
50.0
0.8
0.2
restratify.
Nov. 13
66.6
66.5
65.5
50.9
1.1
0.1
When the fan was turned off November 16 at
Nov. 14
66.8
66.9
66.5
52.8
0.3
-0.1
7:45 a.m., the heated air began to restratify in
Nov. 15
67.7
67.8
67.4
55.3
0.3
-0.1
the facility to a temperature difference of 3°F
Nov. 16
67.7
67.4
66.4
52.6
1.3
0.3
(1.7°C) between the 5 ft (1.5 m) and 35 ft (10.7 m)
Overall Average
67.0
66.8
66.3
53.6
0.7
0.2
temperature loggers. The amount of time
Maximum Value
67.8
67.8
67.4
59.1
1.3
0.4
observed for the air to restratify was 10
minutes. The rapid return to stratified
FIGURE 6 Indoor temperature conditions showing the amount of time to reach temperature uniformity after the
HVLS
fan was turned on. Comparisons reveal air stratification before the fan was turned on at 8:40 p.m. on
air indicates fans need to be operated
November 9, and a small vertical temperature gradient after 8:50 p.m. on November 9.
continuously during the cold weather
70
season.
Fan Off
Fan On
Temperature Uniformity

APRI L 2020

65
60
55
50
7:40a 7:41a 7:42a 7:43a 7:45a 7:46a 7:47a 7:49a 7:50a 7:51a 7:52a 7:54a 7:55a 7:56a 7:58a 7:59a
November 16
35 ft AFF

15 ft AFF

5 ft AFF

Outside Air


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ASHRAE Journal - April 2020

Table of Contents for the Digital Edition of ASHRAE Journal - April 2020

Contents
ASHRAE Journal - April 2020 - Intro
ASHRAE Journal - April 2020 - Cover1
ASHRAE Journal - April 2020 - Cover2
ASHRAE Journal - April 2020 - 1
ASHRAE Journal - April 2020 - Contents
ASHRAE Journal - April 2020 - 3
ASHRAE Journal - April 2020 - 4
ASHRAE Journal - April 2020 - 5
ASHRAE Journal - April 2020 - 6
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ASHRAE Journal - April 2020 - Cover3
ASHRAE Journal - April 2020 - Cover4
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