how do you bim an existing building? south west bim hub ben rouncefield-swales urs – sustainable...

How do you BIM an existing building?

South West BIM Hub

Ben Rouncefield-Swales

URS – Sustainable Design & [email protected]

07917 898548

Rapid Energy Modelling

2

• 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.

URS - Overview


Who cares about existing buildings?

But 70% of all buildings in 2050 are already built

Buildings are responsible for 40% of global energy demand


Carbon Liability: schemes like the CRC require private and public energy users to pay a tax on their energy bill

The EPBD - net-zero energy by 2019 for all new buildings, and carbon neutrality by 2019 for all new commercial buildingsUnable to let E rated buildings from April 2018

Energy costs drive landlords to improve the thermal efficiency of their existing building stock

Research shows higher rental income secured for buildings with sustainability credentials

What are the Drivers for Change?

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


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


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

MANAGE

BUILD

DESIGN

PLAN


The REM process

Information capture

• Physical audit of building• 3D geometry capture (multiple approaches)

Computer

model

• 3D geometry defined• Building characteristics identified: fabric, services and systems• Location, climate and occupancy profiles

Building

performance

• Modelling engine produces simulation• Energy required for heating, cooling, lighting, hot water etc.

Improvement

simulation

• Model is modified to represent improvements• Results illustrate benefits in energy reduction and emissions

Space heating

1%

Pumps & Aux4%

Fans8%

Space cooling

11%

Exterior loads

1%Misc equipment

35%

Lights40%


Laser scanning


Photogrammetry


3D sketching


• From a floor plan – in 30 minutes

• Generated from 2D plans & elevations using AutoCAD, Revit, Vasari, Google Sketchup etc.

• From the laser scan – in 2 hours

• No drawings required – photogrammetry builds a 3D model

Rapid Response


Immediate decision making


Option & Sensitivity Studies - Readily Undertaken

Alter key building elements and observe impact on energy & CO2 outputs and also quality of internal space

Unimproved

With external shading


Example output - recommendations

1 3 5 4 7 6 2 8 12 13 9 10 17 16 14 19 18 23 21 20 22 24 15-1000

0

1000

2000

3000

4000

5000

6000

0

100

200

300

400

500

600

700

Marginal Abatement Cost Curve

Net Specific Cost £/tCO2

Net

Sp

ecif

ic C

ost

£/t

CO

2

Cu

mu

lati

ve C

O2

Sav

ing

s

Short Term Medium Term Strategic1 Space set points on heating system 17 Solar Thermal 20 Upgrade lighting to LED 3 Time clock on water heaters 16 Thermal performance – Ext. Walls 22 Draft lobby at main entrance5 Replace boilers 14 Energy heat meters 24 Thermal performance-windows4 Upgrade time clock system 19 Photo Voltaics 15 Slave Terminals7 Daylight dimming system 18 Thermostat & time control 6 Install PIR control 23 Occupancy sensing on cooling 2 Variable Speed Drives 21 Thermal performance - Roof 8 Repair Damaged windows 12 Lighting zoning and control system 13 TRVs 9 Reduce door air leakage 10 Adapt T8 to T5 light fittings

Case Study

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City of London office - introduction

• Late-Victorian office• Multi-tenanted• Circa 3,500 m2

• 7 stories• Energy spend c. £50k p.a.


City of London office – REM

• Site visit circa 3 hours• Photogrammetry model• Rapid Energy Model created• Accuracy <10% difference

Space Cooling, 5.9%

Space Heating, 7.3%

Fans, 3.5%

Heat Pumps, 11.6%

Exterior loads, 2.0%

Misc equipment,

44.3%

Lights, 25.4%

*includes small power, computers, communications equipment, printers etc

*


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 UnitUpgrade lighting to LED lamps in appropriate areas

Install time clock on water heaters Install lighting PIR occupancy controlInstall occupancy sensing on cooling systems within meeting rooms

Interconnect existing control systems Install daylight dimming systemInstall thermostat and time control on electric panel heaters within communal parts

Adapt T8s to T5s in main officeReplace laptops / docking stations / terminals with "mainframe" and slave monitor and keyboard terminals

Implement energy metering strategyReplace centralised hot water with point of use hot water supplies


City of London office – Improvement Recommendations

-

50

100

150

200

250

300

350

-

10

20

30

40

50

60

Benchmark Current Building Low Cost Quick Wins

Medium Term Strategic

CO

2(t

on

nes

p.a

.)

En

erg

y co

st (£

k p

.a..)

Energy cost

Carbon


REM experience across the Built Environment

• REM studies undertaken since March 2011

• Accuracy consistently <±10%

• Average CO2 and energy savings identified circa 40% Oxford University

Student Accom.

URS Basingstoke

Office

AB InBev Belgium

Office

Manchester Council

Office (Nat vent)

URS NottinghamOffice and Labs

AB InBev Bremen

Office

Oxford University

Student Accom.Major Property Man.

Office (Period)Gateshead

Housing Block

Summary

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• 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

Key issues


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

Thank You

28

Ben Rouncefield-Swales

Associate

URS – Sustainable Design & [email protected]

07917 898548

how do you bim an existing building? south west bim hub ben rouncefield-swales urs – sustainable...

Documents

rapid energy modelling

rapid energy modelling

rem rapid energy

simulation energy

energy savings

energy reduction

stories energy

global energy demand