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Mirakbari, F. and Brotas, Luisa (2013) Ventilated hollow core slab towards energy efficiency of the built environment. In: CISBAT 2013 International Conference Cleatech for Smart Cities & Buildings: From Nano to Urban Scale, 4-6 September 2013, Lausanne, Switzerland.
Buildings are responsible for almost 50 per cent of the UK's energy consumption and carbon emissions. Therefore improving the energy efficiency of the built environment is fundamental if the UK is to meet the proposed objectives of reducing energy consumption and the depletion of fossil fuel resources without harming the environment. Thermal energy storage in buildings plays an important role as one of the energy conservation strategies and the use of Ventilated Hollow Core Concrete Slab (VHCS) is now considered an efficient and cost-effective way to reduce the energy consumption of buildings. Space conditioning systems using VHCS show considerably higher thermal capacities than conventional systems and are therefore able to decrease and normalize extremes of high and low temperatures indoors.
This paper discusses the positive effect the VHCS has on the thermal environment of buildings and thus on the thermal comfort of occupants; likewise how this system influences the energy consumption of buildings. This research mainly focuses on further and higher educational buildings in UK. However, the techniques used and the results obtained from this study may be transferable to other countries with similar climates and building codes.
A summer investigation in one university building located in Norwich and one college building located in Luton using VHCS system with exposed thermal mass is presented. Indoor and outdoor air temperatures, slab temperatures and supply air temperature in different rooms in both buildings were recorded over a two-week period. A post occupancy survey was done to the occupants of the Luton College to assess their thermal comfort levels.
Results of this study confirm the effectiveness of the VHCS in reducing the daily temperature swing and also increasing the ability of a space to handle daytime heat loads. Comparing the overall energy consumption of the buildings with the CIBSE benchmark indicates reduction up to 10% can be achieved.
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