1. GSA Early Concept Design Project – Energy Analysis
Paola Sanguinetti
Chuck Eastman
Georgia Tech
College of Architecture

2. Early Concept Design is a crucial early step for GSA project review

3. Example Early Concept Design
Lower Level
Model defined as :
set of 3D space objects, carefully named
composed on slabs – also used for roof
exterior walls with no construction, percent glazing, with R-values, degree self-shading
Easily defined in all BIM design tools
Level 1

4. Project Purpose
Revit Model
space program review
Bentley Model
simple energy load analysis
ArchiCad Model
circulation & security review
Digital Project Model
common IFC file format
provide significant automated feedback for early stage concept design
cost estimate

5. propose to use Energy+ with defaults
propose to use Energy+ with defaults. Would expect that defaults could be adjusted by energy consultant for later stages of design

6. Energy Usage Analysis Module
ADDITIONAL INPUT DATA TO BE INCLUDED IN THE BIM
Building North Axis
Solar Distribution
Location (City & State)
Exterior Walls
Material
R-value
Fenestration
% of windows on each wall
ratio of width to length
Frame & mullion information
Floors underground (or partially underground)

7. Energy Usage Analysis Module
2 ENERGY ANALYSIS SCENARIOS IN EARLY CONCEPT DESIGN:
1 ZONE
Building modeled as a single thermal zone
2 ZONE
Atrium or 2-story Lobby space
Will require different default for schedule and set point temperature
- Other spaces in the building as a single zone

8. Mechanical Systems Narrative

9. Purposes of Building Shell Energy Analysis
Provide relative energy usage comparison for assessing different design concepts
Siting, orientation and relative shading by different sources, effect of below grade parts of bldg.
Building shape and exposure of building surfaces
Building floor area to external skin area ratio
Shading devices on exterior – if defined
Significance of insulation of annual energy costs
Significance of atriums, courtyards, other architectural features on energy use
Building mass – use in energy capture and dissipation
Natural lighting determined by depth of spaces
Other items?

10. Building Shell Energy Analysis
We plan to replicate this report using Energy-Plus, with interface to the model. Will allow default parameter management by experienced E+ users.
Using an efficiency factor, should just turn these figures into energy usage/yr.

11. Mechanical Systems Analysis
Not sure what calculations to do about mechanical system performance.
we propose to default these factors, except in exceptional projects

12. FOR EACH ALTERNATIVE LAYOUT, IDENTIFY THE DIFFERENCES IN ENERGY REQUIREMENTS
Provide separate energy analysis for each orientation on site.
Building Cooling Load
Building Heating load
MECHANICAL SYSTEMS
247 Tons 3554MBH
Building Cooling Load
Building Heating load
MECHANICAL SYSTEMS
215 Tons 2984MBH
Building Cooling Load
Building Heating load
MECHANICAL SYSTEMS

13. Thank you,
The Georgia Tech Team