Brochures and Data Sheets

What Makes A Mission-Critical Air
Conditioning System So Different?
There are several key areas that differentiate mission-critical
cooling from ordinary comfort air conditioning systems.
Each of these performance criteria has a major impact on the
proper environmental protection of your critical facility.
Temperature And Humidity Control
Mission-Critical Systems are specifically designed to
handle the heat loads generated by electronic equipment.
They utilize fast-response microprocessor control systems
to adjust quickly to changing conditions within the
room, while providing you with complete supervision of
temperature and humidity at all times. Emerson Network
Power lets you choose from several humidification
methods including integral infrared and steam
generation units.
Air Flow Management
Providing the proper volume of air to the specific location
in a data center is as important as the temperature control.
Mission-Critical Systems are designed to handle a wide
range of static pressures within the duct work or under
floor plenium to address this important requirement.
Operating Efficiency
The higher Sensitive Heat Ratio (SHR) of Mission-Critical
Systems results in lower energy operating costs vs. comfort
systems. Four-Step, GLYCOOL™ and Dual-Cool options offer
even more energy efficiency. These enhancements increase
the performance level of the system and more closely track
the cooling load of your critical space.
High Volume
Air distribution
(500-600 CFM
per-ton) manages
high density
heat loads.
Air flow can
be changed by
rearranging
computer room
floor tiles.
High efficiency air filters
assure maximum room
air cleanliness.
Microprocessor control
systems manage cooling,
heating, humidification,
and dehumidification.
High sensible heat ratio
matches the cooling needs
of computer equipment.
High volume air distribution
eliminates hot spots.
Mission-Critical Air
Co
lu
m
bu
s
,
O
H
.
100
90
80
70
60
50
40
30
20
10
0
Normalized Power Consumption
Annual Hours of Occurence - Hrs
900
800
700
600
500
400
300
200
100
0
12.5 22.5 32.5 42.5
Outdoor Ambient Dry Bulb - F
Full System Power Comparison - 100% Load
52.5 62.5 72.5 82.5 92.5
Mi
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ool System
Mi
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n-Criti
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System
T
y
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C
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System
Mission-critical environmental control systems are designed to be much
more energy efficient than their comfort air conditioning counterparts.
Design
Considerations
For Any
Computer Room
Environment
Required Attributes
High sensible heat ratio
to provide high cooling
capacity/minimum
dehumidification
High-efficiency
air filtration
Humidity control
Year-round operation
High density loads
require more room
air changes
More tons of cooling
per square foot
Control staging
Typical Comfort Air
Conditioning Systems
“People” produce an equal
amount of heat and humidity
Minimum MERV rating of 8
Typically an add-on system
with separate controls
Typically used May to October
3-4 per hour
One ton of cooling for every
200-400 square feet of space
Slow response systems,
typically only on/off control
Additional
Design
Considerations
Required For
High Density
Environments
Mission-Critical Air
Conditioning Systems
“Computer” environments
produce high heat/no
humidity
Typical MERV rating of 5
Integral with control system
Positive operation with
outside temperatures as
low as -30° F
1 per minute; 2 per minute
at 200w/sq. ft.
One ton of cooling for every
10- 60 square feet of space
Fast-acting, multiple
cooling stages maintain
tight control
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