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Lighting the way T


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Editorial advisory panel George Adams, engineering director, Spie Matthew Hall


Bakar Al-Alawi, mechanical building services engineer, Atkins


Patrick Conaghan, partner, Hoare Lea Consulting Engineers Rowan Crowley, director, einsidetrack James Fisher, e3 consultant, FläktWoods David Hughes, consultant Philip King, director, Hilson Moran Nick Mead, group technical director, Imtech Technical Services


Jonathan Page, building services consultant engineer, MLM Dave Pitman, director, Arup


Christopher Pountney, senior engineer, Aecom Alan Tulla, independent lighting consultant


Ged Tyrrell, managing director, Tyrrell Systems Ant Wilson, director, Aecom Terry Wyatt, consultant to Hoare Lea


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he performance gap may not be quite the chasm that infl ated energy bills led us to believe. New CIBSE guidance has revealed that the large discrepency between the energy use predicted at


the design stage and that recorded in the operation of the building is, in part, due to interpretation of calculation methods. TM54 Evaluating operational energy performance of buildings at the


design stage offers guidance on providing accurate predictions of energy use at the design stage. It accounts for variables such as small power usage and occupancy hours, and uses dynamic simulation modelling to give more accurate estimates. TM54 also provides a range of values that acknowledge the uncertainty around predicting energy use – which will help eradicate nasty surprises for those responsible for paying bills. TM54 co-author David Cheshire says part of the issue behind the performance gap is that energy models – based on the National Calculation Methodology used in Part L – are being used as an estimate of energy use, rather than as a way of demonstrating compliance with Building Regulations (which they are perfectly suited to). Part L doesn’t take account of small power usage and occupancy hours.


The guidance, will allow designers to focus


TM54 will transform the way industry tackles the real performance gap


on the remaining performance shortfall. According to CIBSE’s technical director, Hywel Davies, it will help designers focus their attention on where ‘energy is really being used and wasted’. TM54 says that for more accurate forecasts, designers must sit down with occupants, and building operators to discuss operating hours


and maintenance regimes. This chimes with the call by CIBSE Facilities Management Group chairman, Geoff Prudence, to involve FMs at an early design stage (page 20). TM54 may enable better, energy use predictions, but we must not


be complacent. There are clearly issues with the way buildings are built and operated, and the growing complexity of today’s technical solutions means engineers will continue to be pushed to their limits. A report by research body Calebre has revealed how important


air tightness is to the successful retrofi t of MVHR in housing (page 50). The monitoring of new technology is essential


to give designers certainty, and it’s good to see an impartial report on the effectiveness of heat pumps by the Energy Saving Trust – and even more gratifying to see that lessons have been learnt in getting the best out of the technology.


ABC audited circulation: 18,558 January to December 2012


Alex Smith, Editor asmith@cibsejournal.com


www.cibsejournal.com


September 2013 CIBSE Journal


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