In regions with high levels of solar radiation ventilated structures maintain the temperature of the outer shell of double skinned buildings at a temperature close to ambient temperatures and reducing significantly the impact of incident radiation. For conventional constructions in these regions, surface temperatures can easily reach 75(C to 80(C. depending on surface orientation, tilt and the time of year. By effectively applying this technique over the entire building envelope, it is possible to reduce envelope gains By about 66%. which corresponds to a reduction in energy consumption for cooling of about 20%. The technique can also be beneficial during the heating period by either maintaining the surface of the envelope at close to ambient temperatures and reducing radiation losses or by creating a blanket of insulating air around the building. depending on its mode of operation. Circulation of air within the building structure need not be limited to the air gap of double skinned buildings only. By utilizing the technique of dynamic insulation. wherein ventilation air is drawn through wall insulation to capture outgoing heat. the energy efficiency of buildings can be increased significantly. Studies have demonstrated that approximately 15% of the total annual devoured energy for space heating can be achieved for typical buildings, whilst the issue of using dynamic insulation for cooling remains unsolved. Finally, the design of the building component can be such that it encourages natural ventilation in the building through stack effect or minimizes exterior convection losses by blanketing the building with an insulating air layer. The proposed project - which is based on the common requirement for a precise understanding of the air Sow within and around breathing structures - has the following objectives: . ò to research and develop three innovative ventilated building components by addressing the common problem of the air flow and heat transfer processes within these structures. ò to investigate the range of construction types that these technologies could be applied to, ò to determine their combined winter/summer performance for heating/cooling, ò to develop a methodology and computer tool for evaluating the incorporation of ventilated structures as retrofit options for existing buildings. . to identify the possibilities for integration of these components - or their design philosophies - which each other and within the building envelope. ò to develop a methodology and computer tool for evaluating the incorporation of ventilated structures as retrofit options for existing buildings, . to determine their combined winter/summer performance for heating/cooling, . to investigate the performance and suitability of these components for different climates, and . to ensure results and buildability of the systems. The Technical Program of the research is divided into four main Workpackages: Component design. integration and buildability. Experimental testing; Modeling; and Integration Methodology.
Funding SchemeCRS - Cooperative research contracts
CB1 1DP Cambridge
190 09 Pikermi - Attiki
CB2 4HG Pampisford