CIBSE AWARDS WINNER BROCKHOLES
The CIBSE Building Performance Awards recognise, reward and celebrate the best performance, innovation and practice in design, commissioning, construction, installation and operation of sustainable buildings and the manufacturers whose technologies enable energy efficiency. For further information on this year’s winners, as well as details of how to enter the 2013 awards, please visit
www.cibseawards.org
Entrenched habits On the pontoon, services distribution is through a series of floor trenches linking the various buildings. The trenches, which are up to 2,000 mm wide and 500 mm deep, only provide access to the cables and pipes at corner junctions because the architect did not want access panels along the lengths of the trenches. Extensive co-ordination was required between the services engineer, architect and structural engineer to achieve this. ‘As a solution, it was quite bold and
daring enough to give me a couple of sleepless nights,’ recalls Pochee. To enable installation, all services are flexible to enable them to be pushed and pulled through trenches between buildings, although ‘it was not the most popular solution with the contractor,’ says Pochee. The building’s pontoon-based location
also created some interesting challenges for the drainage design. Water for most uses is supplied from a nearby borehole
while lake water is used to flush the WCs. Water consumption is minimised by low- consumption sanitary fittings and low-flow taps and urinals. The remote site does not have a mains
K, combined with low levels of air permeability. On average, air leakage is about 6 m3
/m2 /hour @ 50 Pa. ‘It’s not
as good as we wanted, because rectifying errors was expensive’, admits Pochee.
Control buttoned up Users control heating through ‘iPod controls’, so termed because they have been designed to be intuitive to operate without the need for instructions, although the team did draw on symbols to help users. ‘In general these have worked well,’ says
Pochee. ‘What could have been improved is the time delay between pressing a button and the equipment responding,’ he says. Max Fordham is now monitoring the building post occupancy. Overall it is performing well: monthly reports show the temperatures to be comfortable. However, the consultant is looking into the amount of biomass being burnt, which is ‘a little higher than we anticipated,’ says Pochee. The building has achieved an A-rating
Energy Performance Certificate. Its energy efficiency measures alone reduce its carbon emissions by 35% compared to Building Regulations Target Emissions Rating (TER). And when the biomass boiler is included, carbon emissions drop by 85% compared to the TER. This achievement was recognised by
the judges in this year’s CIBSE Building Performance Awards, where the scheme won the New Build Project of the Year for a privately funded scheme. CJ
36 CIBSE Journal September 2012
www.cibsejournal.com
sewer connection, so an onsite sewage management system was needed. Drainage pipework delivers wastewater to a pumping station housed within the pontoon, from where it is pumped to a septic tank on land and then to a reed bed treatment system designed to co-ordinate with the site’s ecology. This solution has about 25% of the energy demand of a municipal sewage treatment system, but it does require a similarly-sized site to the footprint of the building, adds Pochee. In addition to the service trenches, the pontoon houses heating pipes beneath its polished concrete surface. This is the underfloor space heating system. Pochee says space heating loads are minimised by high levels of insulation in the building envelope, which has a U-value of 0.1 W/ m2
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