www.ipesearch.com CLIMATE STRATEGY 39
FEATURE
Tate & Lyle London 94% savings on electricity costs
should become the 11th point in the
government’s plan.
By way of example, the anticipated
savings in CO2 emissions in the 12-year
period up to 2032 from greening public
transport, the shift to zero-carbon
vehicles, and maritime transport
amount to 7 Mt CO2e. However, if we
extrapolate the anticipated annual
energy savings of 7 TWh by greening
pumps, over the period from 2015 to
2032, the reductions amount to
119 TWh or around 60 Mt C02e. This is
on a much greater scale than the CO2
savings of the three elements of the
government’s aforementioned 10-point
plan.
How were pumps missed?
To move a liquid from A to B a pump is
required. Therefore, industrial and
domestic applications are a vital
component of modern living. Given
their importance, it is not surprising that
they are big energy-users. The question
has always been, can better
engineering improve matters and
FIGURE 1:
deliver significant energy savings that
can help us on the road to Net Zero?
Many pumping systems operate
inefficiently; however, as the pump is
‘doing what it is supposed to’, there is
no focus or requirement to look at the
energy efficiency of the pump or the
system in which it operates.
Much of the installed base of pumps is
older technology and inherently more
energy-hungry. Invariably, they have
also been ‘over specified’, because
engineers and plant managers have
wanted to ensure that if they need
‘more muscle’ for their processes, there
is extra capacity available. Older-style
pumps were therefore typically over-sized
and, as such, seldom work at their
optimum efficiency. Newer pumps are
designed to operate efficiently at
variable speeds, so they have the built-in
flexibility demanded without the
energy ‘penalty’.
Figure 1 above shows the results of an
energy audit carried out in 2011 for Tate
& Lyle London. The full audit report is
available at https://betterworld.solutions.
There is also a selection of other case
studies and a second example audit
conducted for GlaxoSmithKline on the
Betterworld website. Our thanks go to
both companies and to the auditors,
Sterling Fluid Systems (UK) Limited.
The Tate & Lyle case shows a 94%
saving in electricity costs (£29,300
annually) by replacing the original
single-speed pump and reduction valve
for a variable-speed pump.
Since a proper energy-efficiency policy
needs to tackle the issue of the bigger
users, the UK government established
the ESOS (Energy Saving Opportunity
Scheme) to implement Article 8 (4 to 6)
of the EU’s Energy Efficiency Directive
(2012/27/EU).
A company needs to comply with
ESOS if it has more than 250 members
of staff or a turnover exceeding £44.1 m
Companies
that fall within
the scope of
ESOS are
required to
undertake an
energy audit
conducted or
overseen by an
approved ESOS
Lead Assessor
Actual
New Pump &
Existing Valve
New Pump &
VSD no Valve
New Pump &
VSD no Valve
Electric
cost
£23,300 £6,400 £1,900
Savings £22, 900 £27,400 >94%
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/betterworld.solutions
