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23:15 on Saturday
22 June 2002

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Unique green energy system in two telehouses

 gas engine powering Brotherhood Aircogen Nimbus CCP (combined cooling and power) equipment

Telecoms company 186k Limited has awarded a multi-million pound contract to Lattice Energy Services in partnership with Brotherhood Aircogen. The partners are to provide secure, cost effective energy to new 'telehouses' - data and telecommunications switching centres - at Hemel Hempstead and Bristol in the UK.

Based on Aircogen Nimbus CHP (combined heat and power) equipment, close-coupled to absorption chillers, these systems set new standards of energy efficiency and reliability.

Telehouse equipment requires electrical energy and air conditioning (cooling) in broadly equal measure. This is normally provided at poor overall energy efficiency because of the high energy cost of electricity-based air conditioning.

However, the combined cooling and power (CCP) system being installed for 186k eliminates the majority of the air conditioning power needs, reducing the overall energy demand by around 22 per cent. The ratio of cooling and power produced by CCP very closely matches the site requirements.

Security and reliability of power supply and air conditioning is vital for telehouses in order to maintain their round the clock, 365 days per year operation. The level of power supply reliability achieved by the LES/Aircogen system exceeds 99.999 per cent. The use of additional cooling capacity provides similar assurance of the maintenance of building and equipment temperatures through climatic extremes.

The exceptional environmental performance of the CCP system, which reduces CO2 emissions by over 20 per cent, secures a number of tax advantages including Climate Change Levy exemption and enhanced capital allowances. Together with the avoided cost of standby generation and electric air conditioning, these provide significantly lower lifetime costs for the installed system.

Lattice Energy Services is managing installation of the CCP systems at Hemel Hempstead and Bristol which it will own and operate under a long term energy supply contract with 186k.

Brotherhood Aircogen is designing and building the CCP systems and will ensure their reliable, efficient and cost effective long term operation.

Both telehouses are scheduled to enter commercial operation by mid-year and will be the first CCP sites in the UK telecoms sector.

June 2001




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Joe Knowles
Brotherhood Aircogen
Tel: 01733 2922450 
Email: [email protected]
Peter Brotherhood 

Peter Kenny
Lattice Energy Services
Tel: 01509 282154
Lattice Energy Services

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