Elizabeth II Court (formerly Ashburton Court) is an office building forming part of The Castle, Hampshire County Council’s Winchester headquarters.
The 1960s concrete frame building is comprised of four levels of podium car parking with two office buildings above. The concrete frame was retained, and re-clad and remodelled to create a naturally ventilated, open plan modern office space. Approximately 250 parking spaces on top of the podium were cleared to create a new entrance. Amenities include courtyards and a 200-seat auditorium. The remodeling of the building cost £40 million. The refurbishment project involved retaining the existing concrete frame.
The existing frame’s thermal mass contributed to approximately 25W/m2 of additional cooling by acting as a heat sink in the daytime. The glazing ratio on the main courtyard and street facades is kept below 40%. This helps to minimise cooling loads through the optimisation of façade design to balance daylighting, solar gain and airtightness.
The development has been re-clad in timber/aluminium composite cladding with brick on the outer facades. The existing concrete facade has, however, been crushed and recycled.
The building incorporates ventilation ducts to draw air out. The ducts have devices at the top known as wind troughs that utilise renewable wind energy to create the suction force that drives the system. Air movement is controlled by a building management system, but lower windows can be operated manually by occupants.
The data centre utilises conventional down-flow air-conditioning units. However, these units are modified to use fresh air when external temperatures and humidity conditions are conducive. In case conventional chilled water is needed, rejected heat from the chillers is used where possible for heating of air-handling units for offices and other areas.
Intelligent lighting is linked to daylight and movement sensors.
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Page last updated: 20 August 2010