three-phase UPS system at 100kVA
installed eight years ago. It may well
have been oversized to run at no more
than 80kVA, a load profile size specified
and based on server specification data
sheets that was never actually reached.
As servers were upgraded to more
powerful virtualised environments, the
load profile almost halves to say less
than 40kVA as physical hardware is
removed from the installation. A single
tranformerless 60kVA UPS run at
40kVA load would more than power the
load and show a potential energy saving
of 25-35 per cent.
Upgrading to a newer UPS system
can produce such a saving because a
more modern transformerless design
can achieve 95 per cent or greater
energy efficiency over a wider load
range (25-100 per cent) compared to
an 8-10 year old system. Older UPS
systems would most likely be operating
at less than 70 per cent efficiency
at lower loads and potentially only
reach 91-92 per cent under optimal
conditions.
Modular UPS systems – nowadays
always-based on transformerless designs
– achieve the same high levels of energy
efficiency with an added advantage.
They can also be used to easily add the
higher levels of power resilience that
were once only available to large data
centre installations.
It does complicate matters slightly as
modular systems tend to be kilo-Watt
(kW) rated than in kVA but taking our
example, two 40kW UPS modules could
be installed in an N+1 configuration.
Using a frame size that can take
either three or five modules not only
provides resilience, but also an easily
scalable configuration for future system
expansion.
Conclusion
According to a 2013 European
Commission SME Performance
Review, almost half the UK economy
is generated by small-to-medium
sized enterprises of which there were
4.9million, employing over 14,424,000
people. If only 80 per cent operate
a server environment and sign-up to
energy improvement programmes,
either to comply with legislation or
energy bill discount schemes it will go
some way to stabilising the UK power
grid, reducing both demand and carbon
generation.
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NETCOMMS europe Volume V Issue 5 2015 39