Reducing operational energy use in commercial buildings has become a major concern since the realization of global climate change due to man-made greenhouse gas emissions. Air conditioning is now a significant contributor to peak period electricity use, and hence to carbon emissions, leading to a search for effective low energy alternatives. Adaptation of underfloor heating technology now come of age with the advent of polybutylene and polyethylene piping, to building cooling is a relatively recent development. Circulation of water is a much more efficient method of transporting heat than air-based systems, offering many advantages as regards performance, capital cost, and running costs. This paper explores the use of water pipes embedded in precast or composite (cast in-situ) slabs to provide cooling and heating for commercial buildings. The work described is part of a UK Government funded project, in collaboration with Corus, to examine the potential of such systems, to develop concept systems, and to produce design guidance. This paper discusses applications in the context of steel-framed buildings. In particular, novel steel floor decks are shown which combine structural efficiency with ability to support embedded pipes and aesthetic appeal to allow exposure of the soffit for maximum cooling efficiency.
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