Navy Dockyard in Devonport, England
The Royal Navy Dockyard in Devonport, near Plymouth in the south of England, is the oldest and largest naval base in Europe. The dockyard at the base has now been fitted with a new waste-fuelled power station for the generation of electricity and steam. Local waste is incinerated at the station to produce 800,000 tonnes of steam at 420°C and 190,000 MWh.
Limited space called for unique solutions
In order to provide electronic and computer equipment rooms with adequate cooling, it was necessary to convert the old system to meet the project requirements. The CHP plant was forced to comply with stringent energy-efficiency standards. Free cooling and direct expansion (DX) cooling were the most efficient options, but since space in the plant was limited and noise restrictions were very strict, it was essential to come up with some unique solutions.
DX cooling is as good as free cooling
An energy efficiency report was produced, based on local weather data. The report showed that DX cooling was as important as free cooling for the energy efficiency of the facility.
Excellent results at the naval base
The upgrade at Davenport was successful and the energy consumption in particular was drastically reduced. It was possible to extend the period of free cooling – TFT 8.5°C – and achieve considerable energy savings. Each year, the FC and DX operating modes saved 48,000 kWh +
24,000 kWh, and the CRAC units’ EC fans 78,600 kWh, amounting to energy savings of no less than 150,600 kWh.