OLYMPIC CASE STUDY AQUATICS CENTRE
Pool hall volume The pool hall, including the roof void space, has a total volume of 180,000 cu m. Fabric heat losses from surfaces account for 60% of the pool hall space heating demand. However, the main concern with regards to envelope heat losses was infiltration at the interfaces between roof element and facade.
Although movement joint at the top of
the facade will seal the building. Even with a sealed building and minimal thermal bridging and interfaces, the design air infiltration will still account for 40% of the total envelope heat losses.
Energy efficiency An energy model was built early on in the design to assess in detail the building energy loads and to assist in understanding where the predominant loads were and which were less significant. The model evolved with the design and formed the basis of both the Part L carbon emission calculation (as required for Building Control and to demonstrate Olympics Delivery Authority efficiency targets) and of building energy modelling in use in accordance with the ODA requirement. The Aquatics Centre improvement on
Building Regulations Part L 2006 is 49%, based on the as-built commissioning data, but prior to the legacy installation (such as the building air permeability test). This is broken down into 16.5% from efficiency measures in building services systems and the remainder from the district heating and power systems. The base thermal model was also used to prepare more detailed energy performance modelling calculations to assess the building more closely to its intended use, outside of building regulations requirements. A carbon emission comparison with
other UK 50 m swimming pool venues was carried out. This information is from the existing building’s Display Energy Certificate results. Each venue differs in area and function, for example, many contain more dry area sports facilities, which will naturally reduce the energy demand.
Conclusion From the work carried out on the building environmental design, it is evident that setting targets was critical to the success of sustainability on the project. It provided the whole team with a common objective and
32 CIBSE Journal July 2012
The diagram shows the envelope heat loss path. Top picture: the Aquatics Centre assumes its distinctive shape
requirement. The energy performance is a significant part of achieving the BREEAM Excellent rating that the project received. The project integrates with the Olympic
Park’s systems at a district scale to achieve the best solution both for the Park and for future-proofing the heating supply. The involvement of building services engineers in the very early stages of the design, not only in systems selection but in the use of building physics, was the key to achieving the 16.5% savings in carbon using efficiency measures alone, before applying renewable energy sources. CJ
l MICHAEL STYCH was building services director on the project, and HOWARD BUT was lead mechanical engineer. Both work for Arup. A longer version of this article was presented to the CIBSE Technical Symposium 2012.
www.cibse.org/symposium2012
www.cibsejournal.com
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