DESIGN FOR PERFORMANCE | PIONEER PROJECTS PIONEER PROJECTS 1 Broadgate, London Developer: British Land MEP: Hilson Moran New City Court Developer: Great Portland Estates MEP: Chapman BDS 2 Ruskin Square, Croydon Developer: Schroders MEP: Arup Ralli Quays Developer: L&G Real Assets MEP: Hannon Associates 4 Angel Square Developer: Federated Hermes/ MEPC MEP: Buro Happold South Molton Triangle Developer: Grosvenor Britain & Ireland MEP: Hoare Lea 11 and 12 Wellington Place Developer: Federated Hermes/ MEPC MEP: Arup St James Market Phase 2 Developer: The Crown Estate MEP: WPP 19-35 Baker Street Developer: Derwent London MEP: Arup Statesman House Developer: Royal London Asset Management MEP: Buro Happold 21 Moorfields Developer: Landsec MEP: Cundall Timber Square Developer: Timber Square MEP: Hoare Lea International Quarter London The Turing Building Developer: Lendlease MEP: NDY For more information on the pioneer projects, visit the Better Buildings Partnership website at bit.ly/CJOct20BBPDfP1 energy performance rating to two decimal points. This figure is then rounded down to the nearest half a star. At design stage, to maximise the Nabers rating, we will try to find the most efficient and effective plant for the HVAC systems, but the contractor might say, I can save 100,000 using an alternative, Thrower explains. If the scheme is at 4.82 stars (a 4.5 star rating) the contractor might put in different plant that brings the total down to 4.67. OK, that is still a 4.5 rating, but youve reduced your headroom should something else change and if that drops the rating to 4.49, then the buildings rating will reduce to 4 stars. The impact of the DfP initiative on the energy efficiency of new buildings will take several years to hit the market. To get a DfP rating, a building has to have been occupied for 12 months at a minimum of 75% capacity, which means the building services consultant will be involved with a project from design, through construction, commissioning and, 19-35 Baker Street is designed by Hopkins Architects with Arup as MEP engineer finally, operation, to input metered data into the model to reappraise it in light of the buildings actual performance. There will be ongoing involvement to update the model through construction to completion, and then to use the model as a comparison with actual metered data once the building starts to be occupied, so you can track your trajectory to your intended Nabers rating, says Thrower. You might set your goal at 5 stars at the outset, but you will not find out if youve achieved that until about six or seven years after that for a large project. Thrower says DfP is not just applicable to new-build office schemes; it will affect existing buildings, too: If you have an existing building, and you can get the metered data, you can give that building an energy rating, he says. However, that rating might only be, say, 3.5, because the building was never designed to optimise energy in use. As a consequence, the performance of existing offices will have to be improved. A refurbishment will need to be undertaken using a DfP approach, because when an office returns to the market it will have to compete with newer stock that will have been designed to optimise its in-use energy performance says Thrower. DfP will have a big impact on office refurbishments. CJ C IBSE has published new Technical Memoranda, TM61-64, which aim to provide insights into operational building performance, occupant surveys, modelling for energy use, and indoor air quality. TM63: Operational performance: modelling for evaluation of energy in use is particularly relevant in the context of DfP as it aims to provide a methodological framework to undertake measurement and verification of building energy performance in use. F or more on the Better Buildings Partnerships DfP initiative, see Learning from Nabers: Designing for performance in the UK, CIBSE Journal, at bit.ly/CJOct20DfP 42 October 2020 www.cibsejournal.com CIBSE Oct20 pp40-42 DFP Overview.indd 42 25/09/2020 18:37