NUTECH ENGINEERING TECHNOLOGIES LTD.
HVLS is HIGH VOLUME LOW SPEED
ENVIRA NORTH, CANADA
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NUTECH ENGINEERING TECHNOLOGIES LTD.
UP TO
50%
CAPEX SAVINGS ON A NEW
VENTILATION PROJECT
UP TO
85%
OPEX REDUCED due TO
RUNNING COSTS
NO
NOISE COMPARED TO A
REGULAR VENTILATION UNIT
1 Day
INSTALLATION PER FAN ...
SAVING PRECIOUS COSTS AND
TIME ON A PROJECT
WATTS
0.05
PER SQ.FT LOWER THAN
LIGHTING LOAD CALCULATION
months
6M
payback on replacement of
existing ventilation systems
ENVIRA NORTH, CANADA
NUTECH ENGINEERING TECHNOLOGIES LTD.
How HVLS Fans Work
You don’t need a physics degree to know that a breeze moving across your skin on a hot day
feels good, especially in humid environments. The cool moving air breaks up the moisture
saturated boundary layer surrounding the body – accelerating evaporation to produce a cooling
effect. People have been using fans to cool themselves long before the advent of the electric
motor; it was logical then, that fans would be one of the first things to be mechanized.
At some point however, engineers became so focused on using speed to increase fan
displacement [ the cubic feet of air per minute (CFM) moved through a fan ] that some
important physics based issues were overlooked. While having a cool breeze brush over our hot
skin feels good, high velocity air movement is both unpleasant and disruptive. Air speed beyond
four or five miles per hour usually offers little, if any, additional cooling benefit as very slow
moving air actually cools best in very hot, high humidity conditions.
Small high-speed fans create a pressure differential that’s essential for many applications, but
where slow movement of free air is the objective, pressure differential is not important.
Therefore, the amount of air that actually is actually displaced [ moved through the fan ] is of
no real significance. It’s the down-stream effects that are important.
A turbulent, high velocity air jet dissipates very quickly. A large column of air, however, “travels”
farther than a small one.
When the down column of air from an HVLS fan reaches the floor, the air turns in the horizontal
direction away from the column in all directions. The air flowing outward is called the
“horizontal floor jet.” Smaller high-speed fans of equivalent displacement are incapable of
producing the same effect.
The power to drive a fan increases roughly with the cube of the average air speed through
the fan. A commercial fan delivering air at 20 miles per hour (mph) requires about 64 times as
much power as a similar sized fan delivering air at five mph! Airspeed, combined with fan
“effectiveness,” means that when the objective is to cool people or animals, very large low
speed [ HVLS ] fans are enormously more efficient and effective than small high-speed fans.
ENVIRA NORTH, CANADA
NUTECH ENGINEERING TECHNOLOGIES LTD.
The Tubercle ™ Advantage
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ENVIRA NORTH, CANADA
NUTECH ENGINEERING TECHNOLOGIES LTD.
21°
Whale Power™ Blade Profile
8°
Outdated Blade Profile
The Tubercle ™ Advantage
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Warranty
10 Year Mechanical
3 Year Electrical
ENVIRA NORTH, CANADA
NUTECH ENGINEERING TECHNOLOGIES LTD.
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SIZE
8 ft
12 ft
16 ft
20 ft
24 ft
CFM
42,136
1,34,152
1,82,173
3,30,050
3,97,701
POWER
0.64 KW
0.64 KW
0.84 KW
1.4 KW
1.4 KW
AMPs
2.8 amps
2.8 amps
3.5 amps
6.3 amps
6.3 amps
RPM
154
123
73
63
57
WEIGHT
105 kgs
115 kgs
128 kgs
148 kgs
158 kgs
SIZE
2.4 m
3.7 m
4.9 m
6.1 m
7.3 m
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Height
8 ft
12 ft
16 ft
20 ft
24 ft
40 ft
3m
7
8m
12m
18m
35 ft
4m
7.5
9m
12m
19m
30 ft
4m
8m
10m
14m
21m
25 ft
5m
9m
11m
16m
23m
18 ft
6m
10m
12m
18m
25m
Area Covered
at 18 ft
1,500 sq.ft..
4,500 sq.ft..
6,500 sq.ft..
15,000 sq.ft..
25,000 sq.ft..
SIZE
2.4 m
3.7 m
4.9 m
6.1 m
7.3 m
ENVIRA NORTH, CANADA
NUTECH ENGINEERING TECHNOLOGIES LTD.
Health and Safety
Executive
How to determine Basic Effective Temperature
3.5
7
8
3.0
o
Dry bulb temperature C
9
10
2.5
25
30
31ambient
35
40
45
12
2.0
13
14
effective temp is
15
Air velocity (m/s)
1.5
16
17
26 degrees
18
1.0
19
∴ 5 deg drop in
20
21
22
0.5
‘feel’ temperature
23
24
0.25
25
26
27
0
29
21
22
28
23
24
30
25
26
Effe
27
ctiv
28
e te
mpe
29
ratu o
re
C
31
32
30
33
31
34
32
33
34
35
35
40
20
25
30
35
o
Wet bulb temperature C
o
Chart of effective temperature C (basic)
ENVIRA NORTH, CANADA
40
45
Applications
Applications
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or email us at [email protected] or [email protected]
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CATALOG 2012.90.1
NUTECH ENGINEERING TECHNOLOGIES LTD.