New Danfoss VLT® Decentral Drive E cient, reliable and powerful
New Danfoss VLT® Decentral Drive E cient, reliable and powerful
New Danfoss VLT® Decentral Drive E cient, reliable and powerful
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& <strong>Drive</strong>s&Controls Energy Award<br />
Bank’s investment<br />
pays off with<br />
70% saving<br />
The energy consumed by<br />
HVAC fans at the London<br />
offices of the European Bank<br />
for Reconstruction <strong>and</strong><br />
Development (EBRD) has<br />
been slashed by around 70%<br />
by retrofitting variable<br />
speed drives to the fan<br />
motors.<br />
The project to reduce the energy<br />
consumed by HVAC fans at the<br />
London headquarters of the EBRD<br />
involved upgrading 23 VAV<br />
(variable air volume) fans ranging in<br />
size from 30–60kW, as well as four<br />
30kW cooling tower fans. The<br />
variable-pitch axial fans had not<br />
been performing to their original<br />
specifications, due to factors such<br />
as age <strong>and</strong> a higher requirement for<br />
process cooling. The fan-maker<br />
Fläkt Woods identified a way of<br />
improving the fans’ efficiency by<br />
fixing the pitch of their blades, <strong>and</strong><br />
controlling their speed using<br />
frequency inverters.<br />
As an initial trial, the fan blade<br />
pitch of one of the 30kW axial fans<br />
was fixed <strong>and</strong> its speed varied.<br />
Monitoring of this arrangement<br />
showed that the annual savings in<br />
terms of electricity costs would be<br />
£4,266, <strong>and</strong> that annual CO 2<br />
emissions would be reduced by 30<br />
tonnes.<br />
The remaining fans were<br />
upgraded over weekends over the<br />
course of about four months,<br />
without disrupting normal office<br />
operations. The work included<br />
dynamic balancing, where<br />
required.<br />
Part of the project was to<br />
integrate the new ABB drives with<br />
the existing Trend building<br />
management system. Fläkt Woods<br />
worked with Trend engineers to<br />
ensure that the change from<br />
variable pitch to 0–10V control via<br />
the BMS was seamless.<br />
Before the work started, Fläkt<br />
Woods commissioned an energy<br />
audit using an energy profiler<br />
located in an LV panel remote from<br />
the fan, to gather energy<br />
consumption data with minimal<br />
disruption. This data – including<br />
values such as kW consumed,<br />
phase voltages <strong>and</strong> current, power<br />
factor <strong>and</strong> kVAr – was captured<br />
around the clock for seven weeks.<br />
After the upgrade, a similar<br />
exercise was conducted. The 30kW<br />
fan which had previously been<br />
averaging a consumption of around<br />
22kW, was now averaging a<br />
consumption of 7kW – a 68%<br />
decrease, or the equivalent of<br />
56.37MWh a year, based on 252<br />
working days. For the project as a<br />
whole, the annual savings are<br />
estimated to be 1.3GWh or 690<br />
tonnes of carbon.<br />
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www.<strong>and</strong>antex.co.uk<br />
e: sales@<strong>and</strong>antex.co.uk t: 024 7630 7722
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