Uncontrolled air infiltration in buildings is compromising energy efficiency and wrecking attempts to reduce CO2 emissions. The time is right to act. This month, Building Services Journal announces a joint initiative involving the CIBSE, BRE and the BSRIA, aimed at improving building airtightness. In an exclusive report, ClBSE president Geoffrey Brundrett launches the airtightness campaign.
It is possible to make high wall inducing vents with low air resistance, combined with natural ventilation or a mechanical exhaust. By means of these vents draughts may be prevented and high efficiencies in fresh air and contaminant removal may be realised, the latter being determined by the position of the outlet. Existing equations related to air flow patterns and Computational Fluid Dynamics (CFD) computer programs can be used, provided that the equations and the CFD program (Phoenics) are modified in order to get better agreement with measurements.
As Canada's first C-2000 office building, Green on the Grand was designed to be energy-efficient and environmentally responsible. Computer simulations and detailed calculations compared the energy consumption of Green on the Grand with that of a similar office building built to contemporary energyefficiency standards (ASH RAE 90.1 ).
The application of computer tools in construction is set for a revolution as integrated software packages come close to fruition. But there are barriers to the increased use of electronic design tools, notably worries over validation, the skills needed both in the design studio and on site and the quality assurance issues of correctly defining product elements and the design criteria. Over the next three articles, we examine the potential for using integrated computer design tools.
The objective of this research is to investigate air flow distribution inside a light weight test room which is single sided naturally ventilated. The ventilation rate into the room is controlled by adjusting four sets of louvres. The local outside air temperature, humidity, pressure, wind velocity and direction were measured. Inside the room the velocity and direction of the inflow air across the high and low level openings, temperature and velocity distribution at four locations and six levels across the room were recorded.
The objective of this research was to investigate thermal comfort with respect to the mass of the building inside a test room which is naturally ventilated. The room is an existing portable cabin of light mass, located at Loughborough University. The comfort parameters for different mass of the cabin were predicted. For this purpose a simulation package, is used to calculate the thermal parameters defined by Fanger. Medium and high thermal masses were added to the test room and their effects on thermal comfort were investigated.
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