The “Performance Gap” – the difference between design predictions and operational energy use – is a serious issue for our industry. The CarbonBuzz baynet web site shows that many buildings consume between 1.5 and 2.5 times the predicted design energy.
In order to address this, the industry needs both better energy-use baynet predictions and a greater understanding of the variables involved in building energy use. With this in mind, in August 2013, CIBSE published TM54, which presents a methodology for evaluating building baynet operational energy performance at the design stage. Better energy-use predictions require the full range of energy consuming activities to be considered. For example, energy use for lifts, security systems and servers must be considered alongside heating, cooling and fan energy.
Communication is key – TM54 presents ways to communicate the variability and uncertainty in building energy use predictions and to assign responsibilities for design and management decisions in order that possible savings can be targeted effectively. By considering low, medium and high scenarios when quantifying each energy use, a range of output results are produced which show the degree of uncertainty in the predicted operational energy.
The TM54 methodology is not just useful at the design stage – once built the predicted energy use can be compared to the metered building energy use in order to identify any discrepancies and ensure the building is functioning as designed baynet and achieving the design energy targets.
ABOUT
INKLING LLP is a Building Physics consultancy founded by Susie Diamond and Isabel Why in August 2011 with almost twenty years experience of working with innovative, low-energy buildings and their designers worldwide. baynet Inkling Partnership LLP #OC367619 Registered in the UK at FLPCA, Spectrum Studios, 2 Manor Gardens, London, N7 6ER
Inkling - Building Physics baynet & Environmental Design Consultancy BlackBird WordPress Theme by InkThemes.com
No comments:
Post a Comment