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the lighting was coming on at 4pm, even though it • Changing the kitchen’s air conditioning from a
was June and not dark outside. A subsequent recall package unit to a split system; and
of the contractor ensured the problem was properly • Replacing around a quarter of the lights with LEDs.
What’s fatal
fi xed.’ This reduced energy consumption to 17kWh, Groves admits he would have liked to incorporate to any business
generating a saving of about 58 per cent. more LEDs, but says at that time the fi ttings weren’t
is to invest in
A fi re at another Pizza Hut restaurant in Shrewsbury, of a good enough standard.
Shropshire, later in 2008 presented an opportunity to Inverters were also fi tted onto the supply and extract
technology
retrofi t lots of the energy-saving technologies that it had fans of the cooker hoods to reduce the frequency of the before you know
been trialling in Watford. This ultimately led to a 25 per electricity supply to the fan. This allowed the fan to
if it’s going to
cent decrease in energy consumption at the Shewsbury operate at a slower speed, rather than it just working
store – despite an increase in sales – compared with the at full power or being off, saving about 12,000 kWh
work – Raefe
amount the site had been using prior to the fi re. In the a year. Watkin-Rees
four months before the fi re 63,000 kWh of electricity ‘The inverters were originally set at 50hz during the
was used; in the same period one year later, 47,000 oven-commissioning stage, as the oven manufacturer
kWh of electricity was consumed. used to have an overly onerous extract requirement,
The main energy-saving measures that were which was further exacerbated by a further overly
implemented included: onerous smoke capture test,’ says Groves.
• Thicker insulation in the walk-in fridge-freezers, ‘This alone resulted in the ventilation system using
increasing it from 75mm to 100mm; approximately 1.5kW more than the design duty
• Relocating external condensers out of a suntrap to a required.
different wall; ‘We reduced the fan speeds with the inverters to
www.cibsejournal.com March 2010 CIBSE Journal 37
CIBSEmar10 pp36-38 pizzahut.indd 37 2/25/10 5:36:43 PM
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