Green
Concept
PUE is the standard used to calculate Data
Center energy efficiency.
The calculation method is Total Facility
Energy divided by IT Equipment Energy.
The lower the PUE value, means more energy
efficient Data Center.
It also means saving more cost for
enterprise.
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For a 100 kW power usage Data Center as an
example,
if city power cost NT$2.5 per kWh, then this
Data Center will need to pay NT$131.4 million annually for electricity
cost in order to operate.
Consider the PUE for this Data Center is
2.5, IT Equipment Energy is 40kW and non-IT equipment (ex: CRAC) will be
60kW.
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However, when PUE decrease to 1.5, non-IT
Equipment Energy will decrease to 33.34kW, the annual electricity
cost decrease to NT$730,146.
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In other word, by decreasing PUE by 1,
enterprise will save NT$583,854 cost annually .
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Although lower PUE means lower enterprise
operation cost, but this will need a lot of energy saving design and
techniques to achieve.
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For instance, the most common seen
"Hot/Cold Aisle"
design (below diagram)
Above diagram's blue arrow represent the
flow of cold air ; red arrow represent hot air.
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This design concept is based on:
Install the cabinet racks so all the hot air
produced by IT equipment can be centralized in one aisle to avoid the
mixing of cold/hot air, and be able to control the air flow.
By that, it is possible to adjust higher
Data Center environment temperature setting, reduce the need for CRAC to
produce cold air.
In other word, CRAC will reduce operation
need (ex: compressor) ; decrease electricity cost.
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A more enhance method, for example, as
below:
we called it
"Closed"
cold/hot air aisle.
It will centralize cold or hot air in a
certain aisle more precisely.
Reducing energy (cooling) wasting.
It also can collocate with other auxiliary
equipment or design to achieve greater energy saving effect. For
example: use
Evaporating Cooling to reduce air
conditioning cost.
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The design concept is:
Use cooling water to take away the heat produced by Data Center. Then
reuse the hot water generated, through the cooling tower to perform heat
exchange with the cold air in atmosphere, to achieve cooling purpose.
This way, it is unnecessary to pay extra electricity cost to cool the
hot water.
From this
Free Cooling Method to
reduce the CRAC electricity cost.
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