CIBSE campaign Compliance
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Eland House
Office building housing the UK Department for Communities and Local Government
Eland House has two chillers, 11 air-handling units, a building management system, two direct expansion units and a number of terminal units such as chilled beams. The building has only been in use since 1998. The inefficiencies of the building were highlighted by the difference in the energy performance certificate (EPC) and display energy certificate (DEC) ratings. The EPC demonstrated a good modern building was
given a reasonable C rating, whereas the DEC showed that there were issues with high energy usage in the building and rated the building at F. To demonstrate and test the use of air conditioning inspections, the Department for Communities and Local Government invited inspectors to look at their air conditioning systems and plant to find out how they could reduce the energy use and improve on the DEC rating. The recommendations ranged from high capital
cost changes to the plant, to utilising the cost-effective ‘quick wins’, focusing mainly on controls issues and the correct operation of equipment. The total energy savings for these measures was just under 550,000kWh, or a 9.9 per cent reduction of the building energy load. This equated to 238 tonnes of CO2 and a cost saving of £32,642 per annum. The implementation costs of these measures were £8,200, which gave a payback of three months with the equivalent cost of £34/tCO2 saved. The result was an improvement of the DEC rating
Nuaire Apr10 Cibse qpg ads x3:Layout 1 15/4/10 15:22 Page 3
The result was an improvement in the DEC rating and proposals for a range of other measures
to an E, but is was proposed that further higher capital cost measures, such as sub-metering equipment, data reading equipment for chillers and some plant upgrades, could improve the rating further.
The full case study can be found in CIBSE Journal, February 2010, starting on page 30
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www.cibsejournal.com
May 2010 CIBSE Journal
23
Simon Weir
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