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Editorial Topic: UPS Efficiency and New Server Standards
In our June newsletter we stressed the inadequacy of UPS systems to meet recent specifications needed
to drive new green oriented computer servers, such as the Energy Star server spec.
Energy Star server specification, which became industry standard, refers also to the required server's
power supply efficiency. We have therefore decided to relate here to this aspect on UPS performance.
AC to DC efficiency of Server power supplies was traditionally in the range of 70%, while medium and
high Power UPS systems efficiencies were about 90%.
To get 1kW power to drive server's computing circuits from a UPS, additional power of about 429
Watt was wasted on server's power supply (1000/0.7) , and about 159 Watt (1429/09) on the UPS .
Total Power processing loss was 587 Watt; about 60%) of computing power. UPS's "contribution" to
overall losses was about 16% of computing power and 11% (159/1429) of total server's power.
New Energy Star specifications require server efficiency of 85%, achieved with Power Factor
correction circuits.
Most UPS systems have already introduced Power Factor Correction and with the aid of better inverter
utilization circuits, are now offered with about 94% efficiency.
With the new servers, total power processing loss of 251Watt (25%) are needed to supply 1kW
Computer Power. While, 176 Watts (1000/0.85) are wasted on server's power supply and only 75Watt
on the UPS. Now UPS "contribution" to processing losses is reduced to 7.5% of computing power,
and only to 6.4% of total server power requirements.
These calculations indicate that the UPS industry should perhaps mitigate its race to squeeze more
efficiency from its UPS systems, and concentrate on other UPS features, which provide more value to
customers.
A 95% efficient UPS versus 94% system, does reduce UPS internal losses by 17%, but the effect on
total server's losses and electricity costs , which should be main buyer's interest, doesn't exceed 1
percent.
A professional IT buyer should probably appreciate improvement in other areas, such as increased
output power factor (discussed in said June newsletter) more than higher efficiency.
UPSonNet Website News
Our August Newsletter emphasized the importance of presenting the UPS directory of Rack Mounted
systems, which provides to users seeking for UPS systems a unique service, by introducing main
relevant UPS brands, and the ability to access both technical information and connections to
professional sales contacts.
We have also pointed out that the last issue is still under construction. During September we have made
some changes in our presentation, such as directing visitors looking for APC Sales Contacts, to a
relevant Distributor Page.
We have also decided to offer relevant reps and distributors to add their company to the directory, at a
very "tempting" introductory price, valid for a limited time.
If your company is a manufacturer's representative or distributor, you can draw interested customers
to your website, by going to: Directory Sign UP.
If your company is a manufacturer, already listed in the directory , please recommend your distributors
to Sign UP.
If you are involved in UPS manufacturing, and your company isn't listed yet, please add it to the
directory, go to: UPS Directory subscription
Industry News
Diverse world exposure was assumed to be the best insurance against local economic downturns; until
last decline in US market, when global markets crashed in unison.
September -News indicate however, that in spite of the small world syndrome, the economy, as far as
UPS systems are concerned is still not entirely correlated.
Whereas European and North American markets are flat and unpromising, Russian UPS market is on the
rise due to rising industrial and mining applications, and old infrastructure, causing electricity cuts.
Asia, and particularly China and India show growth possibilities, due to increasing energy needs.
Northern Emirates however, where the government encourages citizens to use Energy, suffers from
power cuts due to high rate of growth.
It seems that any unstable market, whatever the reason, suffers from power shortage, increasing the
need for UPS systems. For more about it, see: Uninterruptible Power Supply News.
__________________________________________________________________
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Forward this Newsletter to your friend, that might be interested.
| UPSonNet NewsLetter September 2009 |
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