Installation of New CHP system at the Old Aberdeen Campus

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Installation of New CHP system at the Old
Aberdeen Campus

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Background

• The Central Heating Station at the Old Aberdeen
  Campus was 30 years old and the boilers were due
  for replacement.
• The existing steam mains were increasingly
  leaking.
• The electricity supply to the site was through 3
  separate supplies, 2 at HV, 1 at LV.

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Selection of New Plant

• An Option Appraisal was carried out considering a
  number of replacement alternatives.
• The decision was taken to replace the old Central
  Heating station with a new Combined Heat and
  Power station.
• This would supply the Old Aberdeen Campus with
  both heating and electricity.

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Scope of Works

• A brand new heating station, to be built at
  Bedford Road.
• New CHP engine, boilers and ancilliary equipment
  to be installed.
• The existing steam pipe work to be removed and
  new LTHW pipe work to be installed forming a ring
  main.
• Reinforcement of the 11kV equipment, and
  installation of an 11kV ring main.

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Cost

• Cost of the new installation
• 10 Million pounds
• (Of which 1.75 Million was a Community Energy
  Programme Grant from the Energy Savings Trust)

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CHP engine details

• The CHP engine installed is a Jenbacher 612, 12
  cylinder engine that is fired on natural gas.
• This engine is capable of producing 1,630 kW of
  electricity and 1,700 kW of heat.
• The engine is set up to supply the University
  only and there is no export of electricity to the
  grid.
• The electrical output is sized to be able to meet
  the electrical baseload for the Old Aberdeen
  Campus which will give the maximum number of
  hours operation in this mode of operation.
• This load corresponds to approximately half of
  the Old Aberdeen Campus peak electrical demand of
  3,300 kW. Over a year the engine is projected to
  produce over 60 of the Campus site electricity
  requirements

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CHP engine details

• By making use of the heat the overall efficiency
  of the engine is 83 which compares very
  favourably with power stations.
• The result of this overall improvement of power
  generation efficiency is a substantial reduction
  in emissions, at the Old Aberdeen Campus, arising
  from use of electricity. Carbon dioxide emissions
  are reduced, and additionally oxide of nitrogen
  levels are reduced by 45.

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Carbon Dioxide Emissions

• The CHP unit has been running since May 2007 and
  has already reduced carbon dioxide emissions by
  over 1,200 tonnes from the University of
  Aberdeen.

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Cost Saving

• The projected cost saving for the year 2007/2008
  is
• 500,000