Co-operative Retail Services wanted its new headquarters building to be both energy efficient and humane. Have these green ambitions been realised, and did the chilled beams and displacement ventilation systems provide the promised improvements in occupant comfort?

Can natural-ventilation techniques really cope with the demands of hot summer days? That is the question that Monodraught's Terry Payne was seeking the answer to when he invited a BRE team to monitor an installation at the University or Hertfordshire 

The paper describes small scale wind tunnel experiments on the dispersion of contaminants discharged from the bottom of courtyards and other enclosed spaces. The experiments covered a range of courtyards with ratios of depth to width from 5- (consistent with light wells and other very deep cavities) down to 0.1 (consistent with shallow enclosed squares and piazzas that are frequently found in the urban environment).