Refurbishment Project Award
Norman Disney & Young
The Angel Building was an unloved early- 1980s commercial building in Islington, north London. It provided the perfect opportunity for Norman Disney &Young and Derwent London to build on their combined experience of delivering contemporary design, integrated with modern technologies.
Energy reduction was at the heart of the services development. A low-energy displacement ventilation system provides ‘free’ cooling for a large proportion of the year resulting in the high-efficiency water-cooled chillers being used for less time and enabling heat recovery of up to 65%. This gives a 44% reduction in CO2 emissions. To allow the system to overcome the loads associated with a modern-day office, solar gains needed to be minimised. Laboratory tests carried out by Norman Disney & Young give a clear indication of cooling loads achievable with the correct building design. Working closely with architects Allford Hall Monaghan Morris, a high-performance facade solution was developed that included a balanced proportion of glazing to solid elements, high-performance glazing and fritting.
Two biomass boilers provide a significant part of the heating load (representing 15% overall energy use). Variable speed pumping is used on both the chilled and heating water to reduce energy consumption to a minimum. Rainwater is harvested and used for flushing WCs and landscape irrigation, while water reduction measures include low-flow washroom fittings and waterless urinals. In addition, DALI lighting systems which can respond to daylight and occupancy levels reduce electrical energy.
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