Opportunity NOx: Testing standards for air filters

There is now one global testing procedure and classification system for particle air filters – which should have a positive impact on urban air quality and people’s health, as Peter Dyment reports

Tiers for fears: How to ensure data centres keep companies flying

The meltdown of British Airway’s IT systems, after a power-supply failure, demonstrates how critical data centres are to business operations. Andy Pearson looks at levels of resilience and explains why cloud computing is making firms more susceptible to power cuts

A Chicago thriller – chiller replacement

Replacing a district cooling system with chillers required a helicopter to lift new plant into a tiny room 200 metres above Chicago. Cyclone Energy Group’s Benjamin Skelton describes the challenge

Making the case for evaporative cooling

Evaporative cooling can save energy when used in the right climate. AEI’s James Falconer looks at the technology in Hong Kong, Las Vegas and London, and explains why the cooling method is making a comeback