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CHP/Boiler Installation
An NHS OA was undertaken on a major Birmingham hospital. The action plan included a review of the BEMS and consideration of installing standalone, gas fired boiler plant and CHP. Following a post survey briefing the hospital trust decided to undertake all the easures in the action plan. A further, part funded detail study was electricity demand over several days. This involved the use of electricity monitoring equipment, data loggers and interfacing with existing steam meter. A performance specification for the boiler plant was written. Contractors were invited to produce proposal and were briefed on site. A final report was produced which included the performance specifications, steam and electricity demand profiles and projections, economic calculations and sensitivity analysis. A further briefing was carried out. The hospital is now developing a way forward, probably taking an energy services approach.
Compressed Air Study
The agreed
objectives of this
study at a chemical works were to identify and prioritise
actions that can be undertaken by the site to reduce the
energy required for compressed air generation and
treatment and to save carbon.
The factory produces various chemicals including
acrylonitrile and a range of nylon intermediates. The
factory employs approximately 450 people and has a
total energy spend of approximately £35m.
The compressed air is generated at a nominal pressure
of 7.0 barg in a central location close to the main
boilers by two water-cooled, oil free rotary screw
compressors. There is a basic control system, which
uses pressure control and loads/unloads the compressors
and brings in the second compressor when required.
Following generation the air is routed for treatment by
filtration and steam heated desiccant drying.
The air is distributed to the using areas by a
comprehensive piping network.
The annual cost of compressed air generation and
treatment is currently estimated at £151,000.
The action plan included measures with aggregated
savings of up to 35.6% reduction in energy consumption
for generating and treating the compressed air. These
equate to cost savings of up to £53,824, which ranslates
into additional profit for the works and a reduction of
CO2 emissions of 574 tonnes.
In addition, there is believed to be the potential of a
further 828 scfm of leakage. At the current generation
efficiency this equates to savings of £58,760 and a
reduction of OC2 emissions of 739.2 tonnes.
The terms of reference for the study were:
• Carry out performance tests on the compressors
• Measure the air demand and pressure on the
compressor stations over a one-week period
• Measure the air demand and pressure from the main
users over a one-week period
The Managing Carbon Consortium
Carbon Trust Accreditation
Supporting Document 43 20th March 2008
• Establish the quality of the air being delivered to the
site;
• Review the compressed air generation and treatment
systems;
• Conduct a leakage detection survey using ultrasound;
• Establish areas of use and misuse;
• Provide recommendations on energy and carbon saving
opportunities;
• Provide a written report giving findings of the
investigation, identified savings and recommendations
for the future strategy;
• Conduct a post survey briefing on the findings of the
investigation to the site engineers.
Voltage Optimisation
An IOA was carried
out for a small
printing company. One of the recommendations of this
study was to install a voltage optimising transformer off
the main feed to the site. A further part funded detail
study was carried out.
Site electricity profile demand measurements were
carried out on the two LV networks. Accurate
installation costs were obtained and economic
calculations provided. A performance specification was
produced and detailed supplier proposals requested.
A Carbon Trust Energy Efficiency Load was applied for
and granted and the project has been implemented.
Energy Management
Smithkline Beechams
This £1.0m project at SmithKline Beecham, Maidenhead involved the removal of the central boiler house and the steam heating system which was then replaced with an indirect gas fired heating system that was controlled by a central energy management system. This project reduced the costs to the site by £520k in the first year and £560k in the second year and was seen to be a great success upon which other projects on the site were modelled.
Warbutons Ltd
This ongoing programme of energy management has seen, over a
number of years:
• The installation of generation equipment which is
run centrally
• A steam replacement programme for a specific site
• Design and layout of their new bakery construction
programme
Energy Surveying
Booker Plc own
approximately 500
sites and, over a period of 6 years, numerous energy
surveys have been carried out and advice given, on all
energy issues, at their six monthly group engineers’
meetings.
Other work undertaken includes:
• All purchasing for energy and consumption data
collection and storage
• CHP studies
• Identification of energy management system
applications
• Director level consultation on all issues related to
energy costs
Maltings
Association
Following energy surveys of Maltings Association’s 36
sites, a strategy was developed to optimise the energy
used in the drying process of grains for malt. This is a
mathematical strategy which looks at the separate heat
losses in the system to build an ongoing optimisation
strategy from start to finish of the process. This is an
ongoing project and could also be applied to other
drying processes being incorporated with in their control
systems.
Energy Management
Working directly for the board of Bolton Wanderers
during the construction of the Reebok Stadium, advice
was sought and given throughout on the design and build
of the stadium’s most energy consuming systems
including H&V systems, energy management systems and
generation, CHP and energy supply.
