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YTL - HEADQUARTERSESD Case Study


ABN 19347292481

INTRODUCTION

Adam SheatherBIM Manager @ YTL Corporation, Kuala Lumpur Malaysia

Andrew BagnallMechanical / ESD Associate @ JHA Consulting Engineers, Sydney


ABN 19347292481

• Global conglomerate based in Malaysia • Annual turnover $19.2 Billion RM (6.8 Billion AUD)• YTL Employs approx. 10,000 staff globally• Key market sectors:

- Power- Rail- Water- Hotels- Land Development- Telecommunications- Carbon

• Turnkey construction with in-house Architectural/Engineering group• New Flagship HQ building to consolidate to one address

YTL HQ in KL

• 42 Storey Office Tower

• Located in the “Golden Triangle” (Bukit Bintang)

• Malaysia Green Building Index (GBI) – Gold Rating

• Singapore Green Mark – Gold Rating


ABN 19347292481

YTL HQ in KL

• YTL (Client)

• KPF NY (Concept Architect)

• YTL (Design Architect)

• Veritas (Submission Architect)

• BFG Singapore (Façade Consultant)

• JHA (ESD Consultant)

• Webco (MEP Consultant)

• YTL (Structural & MEP Engineers)

• YTL (Contractor)

• YTL (Facility Management)


ABN 19347292481

Consultant Breakdown

• JHA were engaged to provide ESD advice and modelling / calculations to satisfy the GBI & Green Mark

requirements

• One of the mandatory requirements is an OTTV ≤ 50 and RTTV ≤ 25

• Large complex building with many façade elements

• but….

• There was a BIM!


ABN 19347292481

The Brief

• Project still undergoing rapid changes from 3 separate Architects & Façade Consultant

• Fast turn around required to prepare information for budget finalisations

• Client keen to push BIM workflows


ABN 19347292481

Client Focus on using BIM

• Revizto

• Access 2D & 3D Live

• Compare Versions

• Get access to objects

• Easy to share with the whole team

• Combine 2D with 3D for Context

• Create issues, comments and questions with tracking

• Live updates between Malaysia NY, Singapore and London


ABN 19347292481

Model Sharing

The Green Building Index (GBI) is Malaysia's industry recognised green rating tool forbuildings to promote sustainability in the built environment and raise awareness among allconcern related to the building industry.

Malaysian standard “MS1525:2007” provides the baseline minimum standard for the GBI rating

• If design falls below the requirements of MS1525:2007, it is unlikely to be rated.

• Reward for designs that are better than the baseline minimum requirements ofMS1525:2007.


ABN 19347292481

Green Building Index

What is OTTV?‘Overall Thermal Transfer Value’.Indicates the average rate of heat transfer into a building through the buildingenvelope

As per standard MS1525:2007, the general equation for any given orientationis as follows:

Where:α is the solar absorptivity of the opaque wall; Uw is the thermal transmittance of opaque wall (W/m2 K); Uf is the thermal transmittance of fenestration system (W/m2K); CF is the solar correction factor; SC is the shading coefficient of the fenestration systemWWR is the Window to Wall ratio


ABN 19347292481

OTTV ORIENTATION CORRECTION FACTOR(CF)

North 0.9

South 0.92

East 1.23

West 0.94

NE 1.09

NW 0.9

SE 1.13

SW 0.9


ABN 19347292481

OTTV


ABN 19347292481

OTTV From Revit

• YTL created a Revit Mass model

• Façade areas required so used hosted wall elements

• Some faces required multiple façade types so we split into ‘parts’

• Each façade type was colour coded to be easily identified


ABN 19347292481

OTTV From Revit

• Part Schedule to obtain areas of each face

• JHA calculated material properties and added additional parameters to the model

• Calculated values were used to calculate OTTV within Revit


ABN 19347292481

OTTV From Revit


ABN 19347292481

Input Variables Considered

Glass Type Options VLT SC U-value

A DGU: 8mm Clear + 12mm Air + 6mm Clear, Low-e #2 surface 50% 0.4 1.23

B DGU: 8mm Crystal Grey + 12mm Air + 6mm Clear, Low-e #2 surface 30% 0.25 1.23

C Lami or Mono: All Clear glass 40% 0.52 5

D Lami or Mono: Outer lite Crystal Grey 20% 0.42 4.2

E Single Glazed Clear 88% 0.95 5.9

F Single glazed Comfort plus-Green 49% 0.43 3.6


ABN 19347292481

Input Variables Considered

Glass Option:

Zoning Option Blue Green Yellow Red

KPF-SK -602(Typical Vision-Spandrel Combo

at Office)(All-Spandrel at Core and MEP) (All-Vision)

Option 1 A A NA A

Option 2 B B NA B

Option 3 A C NA A

Option 4 B D NA B

Option 5 C C NA C

Option 6 D D NA D

Alt-1 F E NA F

Alt-2 B E NA B

KPF-SK-603(Typical Vision-Spandrel Combo

at Office)(All-Spandrel at Core and MEP)

All-Mono-Spandrel

at West Core)(All-Vision)

Option 7 A A C A

Option 8 B B D B

Results

Glass Options

A DGU: 8mm Clear + 12mm Air + 6mm Clear, Low-e #2 surface

B DGU: 8mm Crystal Grey + 12mm Air + 6mm Clear, Low-e #2 surface

C Lami or Mono: All Clear glass

D Lami or Mono: Outer lite Crystal Grey

E Single Glazed Clear

F Comfort plus-Green

Option Glass Type OTTV

Option 1 A 34

Option 2 B 22

Option 3 A+C 34

Option 4 B+D 23

Option 5 C 51

Option 6 D 41

Option 7 A+C 34

Option 8 B+D 23

Alt-1 E+F 41

Alt-2 B+E 23

Alt-3 A+E 34

0

10

20

30

40

50

60

Option1

Option2

Option3

Option4

Option5

Option6

Option7

Option8

Alt-1 Alt-2 Alt-3

34

22

34

23

51

41

34

23

41

23

34

Overall building OTTV


ABN 19347292481

Conclusion


ABN 19347292481

• BIM enabled us to collaborate rapidly across an international team based in Sydney, New York and Kuala Lumpur

• The use of mass models with embedded data enabled rapid calculation of the OTTV values as opposed to taking

measurements off plans

• By adding parameters and calculating data within the model it was easier to keep track of options

• Both client and consultant being Revit savvy aided the process

• Future development – create dynamo script to read a matrix of input variables

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