EDITORIAL
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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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C, extreme weather events will be a regular feature of the British summer. And the 2O
2O C fi gure is only an average predicted increase – global warming could cause sustained temperatures of that are 10O C
warmer than the norm in certain circumstances. The UK is fortunate in having relatively mild weather – in less temperate zones with a continental climate the impact of global warming is much more extreme. Where air conditioning is standard, the strain on power companies during hot weather is immense. Only last month, power use in New York State reached an all-time record of 33,955 MW, as consumers responded to 100O
C temperatures
In 2003 a baking hot day in Ontario triggered a blackout affecting 45m people in eight US states
by cranking up the air conditioning. Excessive demand can have critical consequences. In 2003 a baking hot day in Ontario triggered a blackout affecting 45m people in eight US states, and 10m in Canada. Part of the problem is that many buildings have been built without taking overheating into account. Glazed towers may offer users light (and glare) but they rely on air conditioning to keep people cool, while highly insulated buildings that protect occupants against cold winter days, can be prone to overheating in the summer. The challenge of adapting our cities to mitigate against rising temperatures was a key theme of George Adams’ presidential address. The question of ‘peakiness’ and urban heat
islands was also addressed at a recent conference organised by CIBSE’s Natural Ventilation Group, with particpants suggesting a range of solutions, including more planting, use of refl ective surfaces and low-energy lighting, and a return to more traditional building principles. The publication of two CIBSE Technical Memorandums by the Overheating Task Group could not be more timely (page 22). TM52: The limits of thermal comfort: avoiding overheating in European Buildings offers a clear defi nition of overheating, while TM49 Probabilistic Design Summer Years for London, helps engineers accurately predict the risk of overheating in the capital. Specialist guides such as these should help ensure future generations are sitting more comfortably that I am at the moment.
ABC audited circulation: 18,558 January to December 2012
Alex Smith, Editor
asmith@cibsejournal.com
s I type, Britain is sweltering through its longest heatwave since 2003. External temperatures have soared to 33.5O
C and it’s not much cooler in homes and offi ces as,
once again, the inability of the UK building stock to deal with a hot summer is exposed. With climate change predicted to increase temperatures by at least
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August 2013 CIBSE Journal
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