This document discusses a case study using combined BIM and GIS modeling for building energy conservation. It introduces the Department of Land Surveying and Geo-Informatics at PolyU, which provides training in geomatics including BIM. A 3D model was constructed of Block Z and surrounding areas using floor plans, existing survey data, and a landscape scan. Daylight and solar radiation simulations were performed on the combined model. Seasonal differences in sunlight and shadows cast by neighboring buildings were analyzed. An intelligent lighting management system was designed for the 6th floor based on daylight factor maps and lighting locations. The study demonstrated the benefits of integrating BIM and GIS for optimizing building lighting and energy conservation.

1. A Case Study of Using Combined BIM
and GIS Model for Building Energy
Conservation
Mr. Kent Lam, Ms Jing May Wong,
Department of Land Surveying and Geo-Informatics
The Hong Kong Polytechnic University
12/12/2015 1

2. Agenda
• Introduction of Department of Land
Surveying and Geo-Informatics
• Land Surveyors’ in BIM
• Combined BIM and GIS Model for Building
Energy Conservation
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3. “地理国情监测技术”专业
Introduction of Department of Land
Surveying and Geo-Informatics

4. LSGI
4
• The ONLY academic unit in Hong Kong to
provide professional training for Land
Surveyors
• Programme:
– Research degrees: Mphil, PhD
– Taught programmes:
• MSc in Geomatics (Land Surveying or Geo-IT)
• BSc (Hon) in Geomatics (Land Surveying, Geo-IT,
Utility Management and Surveying)
• HD in Geomatics
12/12/2015

5. LSGI
5
• Research Areas
– GPS positioning, GIS, Remote Sensing, Digital
Photogrammetry, , Intelligent Transportation
System, BIM
• BIM implementation in BSc and HD
curriculum
– Introduction level: what is BIM?
– Technical level: Microstation, Inroads, AutoCad,
Revit, 3D model creation
– Management level: BIM project management,
case studies12/12/2015

6. “地理国情监测技术”专业
BIM – Land Surveying
Perspective

7. Definition of BIM
7
• Base on a continuously evolving 3D model
– 3D
• A construction life cycle process
– 4D, 5D, ….
• encompasses geometry, spatial
relationships, geographic information, and
quantities and properties
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8. What is BIM?
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9. Values of BIM
• Improve
– Building quality
– Collaboration among all parties involved
• Reduce
– Conflicts
– Changes
– Cost
– Time
– Wastage
• Better
– Design
– Cost control
– Progress control
– Client and contractors communication

10. Professional Land Surveyors’ Duties
10
• As-built Survey to fulfill BIM and Smart
City’s needs
– Indoor
– Outdoor
• Construction Data Management
– Data collection
– Data integration
– Data Model
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11. 3D, 4D and 5D BIM
Field Data
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Project Data Management
- Manage changes
- Manage resources
- Manage constraints

12. BIM Construction Life Cycle
12
• BIM
Land
Surveying
12/12/2015

13. Data
Planning Design
ConstructionOperation
BIM Construction Life Cycle
13
• BIM
Data Management
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14. “地理国情监测技术”专业
Combined BIM and GIS Model
for Building Energy Conservation

15. Objectives
15
• Investigate the use of BIM and GIS
technologies for building energy
conservation – lighting
• Study Area
– PolyU and Block Z
– Move-in 2012
– 3D building model not available
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16. 16
Study Area

17. Three Main Tasks
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3D Model Construction
Daylight Factors Analysis
Lighting Optimization

18. Procedures
18
• 3D Model Construction
– Block Z
• Floor plan (G/F – 12/F)
• From FMO of PolyU
– Buildings and Landscape of Surrounding Areas
• Using existing data from Survey and Mapping Office
– 2D maps
– 3D building and infrastructure data
– Terrain data
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19. Block Z Model Construction
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 Basic shape is generated
 Daylight analysis:
 Basic shape
 Boundary conditions of
several elements
 Walls
 Partitions
 Windows
 Openings
 Floors
 Roofs

20. • 3D BIM model with walls, windows, …
Phase 8 – Building Model
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21. • For Green Building Certification
Phase 8 – Building Model
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22. • BIM Set-up Requirement
22
Building Model Setup
Requirements BIM Model at this Report
1. BIM Model Zone
For control the BIM file sizes, models are
separated into several disciplines
Separated into 12 zones by
floors
2. Project
Coordinates
1. Geo-referenced with HK1980 Grid
2. Cross reference to the project gridlines
3. Origin point is set up as the
basis for model sharing systems
4. Rotation angle of Project North to True
North is zero
5. Height is in millimeter in relation to
HKPD
1. Referenced with HK1980
Grid
2. Origin point of the project is
(0, 0, 0)
3. Rotation angle of the
Project North to True North
is 0 degree.
4. Height is in millimeter in
relation to HKPD

23. • BIM Set-up Requirement (cont.)
23
Building Model Setup
Requirements BIM Model at this Report
3. Model Unit
Building elements have to be modeled in
the same units
The unit is in Meter
4. File Management
Drawing file names have to follow naming
convention consistently
Drawing file names are
consistent

24. Buildings and Landscape of
Surrounding Areas
24
• Surface model and Solid Model
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25. Phase 8 – Landscape Model
2512/12/2015

26. Phase 8 – Landscape Model
26
• Landscape model with scanned 3D model
and 3D BIM model
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27. 12/12/2015 27
Block Z BIM
Model
3D Landscape
Model
Combined 3D
Model
Solar Radiation
Simulation
Shading Range
Simulation
Daylight Factor
Calculation

28. 12/12/2015 28
Block Z BIM
Model
3D Landscape
Model
Combined 3D
Model
Solar Radiation
Simulation
Shading Range
Simulation
Daylight Factor
Calculation
Incident Solar Radiation
= Solar Absorption
+ Solar Reflection
+ Solar Transmission

29. 12/12/2015 29
Block Z BIM
Model
3D Landscape
Model
Combined 3D
Model
Solar Radiation
Simulation
Shading Range
Simulation
Visualization of the shadow over a range of times

30. 12/12/2015 30
Block Z BIM
Model
3D Landscape
Model
Combined 3D
Model
Solar Radiation
Simulation
Shading Range
Simulation
Daylight Factor
Calculation
Daylight admission to the Interior
DF = sky component
+ external reflected component
+ Internally reflected component

31. DF diagram of 6/F
31
Daylight Factor (DF)
15+
0
15+
0

32. 12/12/2015 32
Building
Landscape
Combined Model
Exterior
Factors

33. Phase 8 – Interior Model
33
(Zemmouri & Schiller, 2004)
Windows
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34.  Design of Intelligent Lighting Management system
 Control the use of light depends on the level of illuminance from
daylight
 Transforming DF diagram from Bitmap to polygon
34
Lighting Optimization

35. “地理国情监测技术”专业Case Study in Block Z

36. • Exterior Factors:
 Seasonal difference in incident solar radiation
 Shadow casted from Phase 8
 Shadow casted from neighboring buildings
• Interior Design Factors:
 Window size
 Partitioning
• Design of Intelligent Lighting Management for 6/F
36
Case Study and Result Analysis

37. 37
Seasonal Difference in Incident Solar Radiation
Summer
Winter
North area of podium:
Decrease from about 4500 W/m2 to
about 2500 W/m2 visually

38. • Summer Solstice:
 Evenly distributed in east and west directions
• Winter Solstice:
 Mainly casted on northeast, north and northwest directions
38
Shadow Casted from Phase 8
Summer
Solstice
Winter
Solstice

39. 39
Shadow Casted from Neighboring Buildings
• Obstructions at northwest:
 Wylie Court
 Pakistan Club
• Obstructions at southeast:
 Block Y
• Obstruction at East
 Block V
Block Y
Block V
Wylie Court
Pakistan
Association
Phase 8

40. • Winter Solstices
40
Shadow Casted from Neighboring Buildings
Block V
Wylie Court
Pakistan
Association
Block Y

41. • Window-to-wall ratio (WWR):
The ratio of total window area to total facade
area including windows
WWR
= total area of window/total façade area
41
Window Size and Wall

42. Design of
Intelligent Lighting Management
42 Jing May WONG 2015

43. 43
Intelligent Lighting Management
• Create internal lighting location plan from information
provided by FMO
– Manual digitization
• Correlate the DN factors with the light sources spatial in
GIS
• Selection of different interior lighting configuration based
on time of a day and season

44. • Selection of Artificial Light in Summer
• When the DN value is smaller than the maximum DN value, the light is
selected
44
Intelligent Lighting Management
Time 0800 0900-1600 1700
Selection of
artificial light

45. • Selection of Artificial Light in Winter
45
Intelligent Lighting Management
Time 0800 0900-1600 1700
Selection of
artificial light

46. • Comparison on the selection of light in summer and
winter
 Selection at 0800 in summer is less than winter
• Reason
 The sunrise time in summer: 06:01 am
 The sunrise time in winter: 07:02 am
 At 0800, the sun only rise for an hour in winter
 The illumination from sun is not as strong as summer
46
Intelligent Lighting Management

47. Conclusion
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• Successful combined Exterior and Interior
factors to optimize lighting control
• Combine the use of both BIM and GIS
technologies together and apply in building
energy conservation
• Factors such as building materials are not
considered.
• Only solar light is considered but not solar
heat factor

48. Thank You
Mr. Kent Lam
Department of Land Surveying and Geo-Informatics
The Hong Kong Polytechnic University
12/12/2015 48