T&A overcomes control problems for Terminal 5 at Heathrow Airport

Published:  10 February, 2008

T5
Nearly 2000 valves from Tour & Andersson lay a vital role in controlling environmental conditions in Terminal 5 at Heathrow Airport.

Tour & Andersson has supplied 1841 valves, including over a thousand differential-pressure and flow-control combination valves for the Terminal 5 buildings and rail station at Heathrow Airport. The company has also supplied three TA-Aqua+ oxidation technology units for the project.

Specified by consulting engineers at Arup and installed by Babcock Engineering, the T&A equipment help optimise energy usage.

The valves are part of a system that draws water from a district cooling scheme served by a central chiller farm. The only chilled-water pumps are in the chiller farm, not in the buildings.

As a result of this system design, there was a risk of intermittent pressure throughout buildings on the site, which could lead to an uncomfortable indoor climate and undesirable noise — posing a challenge for 2-port control valves and the balancing of systems. An alternative solution was provided by T&A KTM and DKH combination valves, which provide greater flexibility, control and cost savings for variable-flow systems.

The TA-Aqua+ systems is a chemical-free method of preventing legionella bacteria by helping remove all micro-organisms from hot and cold systems.

All the pressure-independent control valves were recalibrated to design flows before delivery to site as required for the tightly timed installation programme.

For more information on this story, click here: Feb08,138

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