Mind the ‘Performance Gap’!

CIBSE released TM54 methodology in 2013 for evaluating energy performance of buildings at the design stage. Hurley Palmer Flatt have been assigned to make a TM54 Assessment, what does this mean on the project:

TM 54 Methodology was introduced by CIBSE in August 2013 and helps to close the performance gap between design intention and operational performance. The methodology evaluates the operational energy performance of buildings at the design stage and at the same time it provides the tools for more comprehensive predictions of likely operational energy consumption than earlier methodologies.

TM54 differ from other modelling as this time we are going beyond compliance modelling to assess and report on all energy uses of a building. Dynamic Simulation Models (DSM) can give now more realistic profiling for heating, cooling, fans, and pumps attempting to replicate actual operational hours occupancy density and energy management. In this way we can have more accurate results of energy use, running costs and carbon emissions of the building that is being assessed.

For one project we are currently working on, TM54 Methodology has been considered for using DSM and non-DSM calculations to accurately assess energy usage for numerous scenarios with different management factors. A sensitivity analysis has also been considered for different weather files and occupancy profiles to review against CIBSE Guide F benchmarks.

Modelling can be a powerful tool – providing robust performance benchmarks, targets for building operators and feedback to Hurley Palmer Flatt design teams. Communication is always the key, and TM54 presents ways to communicate variability and uncertainty in building energy use predictions and assign responsibilities for design and management decisions, hence the possible savings are targeted effectively.

By using TM54 Methodology Hurley Palmer Flatt Energy & Sustainability team focuses on minimising the energy performance gap in buildings in order to contribute to the bigger picture, to reach the targets that have been set by EU to reduce energy usage by 2050.

As European Commission’s Energy Efficiency Plan clearly states ‘the greatest energy saving potential lies in buildings’. We are aware of that and we act accordingly.