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In the fi rst in a series of CIBSE-sponsored building- performance case studies, John Field and Alexandros Balaskas show how energy saving measures at a luxury London hotel can provide a return on investment

arriott Hotels International gives energy and carbon management a high priority, and the group has committed itself to reducing fuel and water use by a further

The energy effi ciency performance of the Marriott Hotel Marble Arch, central London, built in 1970, was thoroughly assessed earlier this year.

25 per cent over 10 years. One recent practical example of how it is attempting to achieve this target is the group’s refurbishment and then review of a property in central London. The Marriott Hotel Marble Arch was built in 1970

and refurbished in 2000. Earlier this year CIBSE commissioned energy management consultancy, Power Effi ciency, to assess the hotel’s energy effi ciency

operations and standards. The aim was to provide clear and detailed technical information to CIBSE low carbon energy assessors on actual building performance. The full report, available online, aims to give assessors a better understanding of what works and what results can be expected from different systems – thereby helping them to give appropriate recommendations for energy improvement measures to clients. Further projects will be conducted and published later this year. The Marriott is a 240-room, air conditioned luxury

facility with swimming pool, leisure facilities, conference rooms, a restaurant, a kitchen and meetings rooms. The overall fl oor area of the hotel is some 16,050 sq m (gross internal area). The review looked at installed building services

systems, energy consumed, and energy improvement measures. A detailed analysis of the overall energy use and performance of heating, ventilation and other systems was undertaken using the CIBSE TM22 procedure. Overall energy performance standards can be assessed by comparing energy use against appropriate hotel benchmarks. The hotel has a substantial combined heat and

power plant which reduces energy use and carbon emissions, and a heat pump that allows the heat removed for cooling of rooms to be used for heating of other areas or the swimming pool (see ‘Services’ box on page 42).

38 CIBSE Journal June 2010 www.cibsejournal.com

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