A new theatre at Bedales school, designed by Hampshire County Architects, includes on Its green agenda a cooling system made from underground concrete pipes, through which cold air is driven.

What better way for a university to research environment friendly building methods than to build a full scale model on campus?  Helena Russell reports, photographs by Grant Smith.

This paper compares the practice of dilution ventilation (DILVENT), which ideally requires perfect mixing, with displacement ventilation (DISPVENT), which involves fresh air displacing contaminated air without mixing. Keeping DILVENT as a reference the approach of intervention was used to estimate the potential of DISPVENT for improving environmental conditions in a garment sewing plant. Air exchange efficiency of DILVENT came to 49%. DISPVENT improved the efficiency lo a level of 57%. At workstation level DISPVENT improved air renewal by a factor of 1 .3.