How do you BIM an existing building? South West BIM Hub Ben Rouncefield-Swales URS – Sustainable Design & Construction ben.rouncefield-swales@urs.com 07917 898548 URS - Overview • One of the world’s leading engineering, construction and technical services firms. • Focuses on four key markets: • • • • Infrastructure Governments Power Industrial & Commercial • Fully integrated services support full project lifecycle. • Serves federal, national, state and local government agencies, FORTUNE 500 companies and other multinational corporations. • Approximately 57,000 employees in more than 50 countries worldwide. Rapid Energy Modelling 2 Who cares about existing buildings? Buildings are responsible for 40% of global energy demand But 70% of all buildings in 2050 are already built Rapid Energy Modelling What are the Drivers for Change? Energy costs drive landlords to improve the thermal efficiency of their existing building stock Rising energy costs will force occupiers to adopt sustainable operations and improve the efficiency of M&E equipment The Green Deal intended to stimulate the improvement of energy efficiency in existing buildings Rapid Energy Modelling The EPBD - net-zero energy by 2019 for all new buildings, and carbon neutrality by 2019 for all new commercial buildings Unable to let E rated buildings from April 2018 Research shows higher rental income secured for buildings with sustainability credentials Carbon Liability: schemes like the CRC require private and public energy users to pay a tax on their energy bill What is happening now? • Traditional energy audits • Cost can vary depending upon level of output required • Some modelling may be done for high investment items – usually at design stage • More involved AM&T contracting • High cost and long contract periods • Creates good data but still need to work up into opportunities • Typically outputs are data not models • Energy Performance Contracting • Investment grade energy audit • Detailed modelling to underpin finance • No initial cost to client but pays through savings • Do It Yourself • Success varies depending upon in-house skills • Unlikely that any modelling would be done Rapid Energy Modelling That’s why URS developed REM • Rapid Energy Modelling • A tool developed by URS in partnership with AutoDesk • Uses innovative means to quickly construct a 3D model of the building • Physical Audit feeds information into the model • ReVit models the building and tests improvement measures • Ouptut leaves a legacy model for the building Rapid Energy Modelling MANAGE PLAN BUILD DESIGN The REM process Information capture Computer model Building performance • Physical audit of building • 3D geometry capture (multiple approaches) • 3D geometry defined • Building characteristics identified: fabric, services and systems • Location, climate and occupancy profiles • Modelling engine produces simulation • Energy required for heating, cooling, lighting, hot water etc. • Model is modified to represent improvements Improvement • Results illustrate benefits in energy reduction and emissions simulation Rapid Energy Modelling Space heating 1% Pumps & Aux 4% Space cooling 11% Lights 40% Misc equipment 35% Fans 8% Exterior loads 1% Laser scanning Rapid Energy Modelling Photogrammetry Rapid Energy Modelling 3D sketching Rapid Energy Modelling Rapid Response • From a floor plan – in 30 minutes • Generated from 2D plans & elevations using AutoCAD, Revit, Vasari, Google Sketchup etc. Rapid Energy Modelling • From the laser scan – in 2 hours • No drawings required – photogrammetry builds a 3D model Immediate decision making Rapid Energy Modelling Option & Sensitivity Studies - Readily Undertaken Unimproved With external shading Alter key building elements and observe impact on energy & CO2 outputs and also quality of internal space Rapid Energy Modelling Example output - recommendations 6000 700 5000 600 Net Specific Cost… Cumulative CO2… 4000 500 3000 400 2000 300 1000 200 0 100 -1000 1 3 5 4 7 6 2 Short Term 1 3 5 4 7 6 2 8 12 13 9 10 Space set points on heating system Time clock on water heaters Replace boilers Upgrade time clock system Daylight dimming system Install PIR control Variable Speed Drives Repair Damaged windows Lighting zoning and control system TRVs Reduce door air leakage Adapt T8 to T5 light fittings Rapid Energy Modelling 8 12 13 9 10 17 16 14 19 18 23 21 20 22 24 15 Medium Term 17 16 14 19 18 23 21 Solar Thermal Thermal performance – Ext. Walls Energy heat meters Photo Voltaics Thermostat & time control Occupancy sensing on cooling Thermal performance - Roof 0 Strategic 20 22 24 15 Upgrade lighting to LED Draft lobby at main entrance Thermal performance-windows Slave Terminals Cumulative CO2 Savings Net Specific Cost £/tCO2 Marginal Abatement Cost Curve Case Study 18 City of London office - introduction • • • • • Late-Victorian office Multi-tenanted Circa 3,500 m2 7 stories Energy spend c. £50k p.a. Rapid Energy Modelling City of London office – REM • • • • Site visit circa 3 hours Photogrammetry model Rapid Energy Model created Accuracy <10% difference Space Cooling, 5.9% Lights, 25.4% Space Heating, 7.3% Fans, 3.5% Heat Pumps, 11.6% Exterior loads, 2.0% * Misc equipment, 44.3% *includes small power, computers, communications equipment, printers etc Rapid Energy Modelling City of London office – Improvement Recommendations Low Cost, Quick Wins Medium Cost Strategic Energy cost saving (p.a.) £ 10,260 £ 9,570 £7,550 Carbon emissions saving (p.a.) 21% 19% 15% Specific improvement measures Review and implement Good Practice recommendations (behaviour & operation) Install Voltage Optimisation Unit Upgrade lighting to LED lamps in appropriate areas Install time clock on water heaters Install lighting PIR occupancy control Install occupancy sensing on cooling systems within meeting rooms Interconnect existing control systems Install daylight dimming system Install thermostat and time control on electric panel heaters within communal parts Adapt T8s to T5s in main office Replace laptops / docking stations / terminals with "mainframe" and slave monitor and keyboard terminals Implement energy metering strategy Replace centralised hot water with point of use hot water supplies Rapid Energy Modelling City of London office – Improvement Recommendations 60 350 Energy cost Carbon 300 250 40 200 30 150 20 100 10 50 - Benchmark Rapid Energy Modelling Current Building Low Cost Quick Wins Medium Term Strategic CO2 (tonnes p.a.) Energy cost (£k p.a..) 50 REM experience across the Built Environment • REM studies undertaken since March 2011 • Accuracy consistently <±10% • Average CO2 and energy savings identified circa 40% URS Nottingham Office and Labs Oxford University URS Basingstoke AB InBev Belgium Manchester Council Student Accom. Office Office Office (Nat vent) AB InBev Bremen Oxford University Gateshead Office Student Accom. Major Property Man. Office (Period) Rapid Energy Modelling Housing Block Summary 24 Key issues • • • • Lots of buildings – most already built Poor understanding of building performance Traditional audit / survey take a long time Need to act now to meet commercial imperatives: • Delivering cost savings • Improving energy performance • Enhancing working environment • Reducing carbon emissions Rapid Energy Modelling What benefits will REM bring? • It helps reduce a building’s energy running costs and CO2 emissions • It provides a rapid focus on building improvement options • It is a Building Information Modelling (BIM) process, creating a legacy model that can be retained and refined • Improves building user environment Rapid Energy Modelling Thank You Ben Rouncefield-Swales Associate URS – Sustainable Design & Construction ben.rouncefield-swales@urs.com 07917 898548 28