1. Principles of Energy Management in Buildings
Green Building Council of Namibia
Glenn Howard – Emcon Consulting Engineers

2. Energy Management in Buildings
The case for energy management in buildings
Why?
How much?
Do we use?
Can we save?
Where can we save?
What is the process?

3. Energy Management: Why bother?
Sustainability
Reduce greenhouse gas emissions
Reduce consumption of finite energy resources
Migrate to infinite energy resources
Green Star Rating
Demonstrate commitment to sustainability
Provides a rigorous methodology
Business case?
Is there a business case?
If so, we have a winner that gets the horse (building owner) to drink from the eternal river

4. Green Star SA - Rating Tool
Existing Building Performance (Pilot)
“Energy” category points = 27% of rating:
Energy reduction – related to GHG emissions (25 points)
Peak electricity demand reduction (2 points)
Add “Building Management” and “Water”
= 44%

5. Why existing buildings?
1% New build & refurb
99 %
Existing Buildings

6. How much energy?
SANS 204 levels based on theoretical simulations of “notional buildings”, not actual research.
Offices
Average Windhoek offices 189 kWh/m²/annum
Research 41 offices in Cape Town 188 kWh/m²/annum

7. How much demand?

8. How much can be saved?
N$1.95M/annum
N$2.7M/annum
N$470k/annum

9. How much can be saved?

10. Is there a business case?
Renovation of shop floor lighting

11. Where to save
Energy source (electrical, gas, diesel, paraffin, solar, wood)
Air conditioning (HVAC) and refrigeration
Lighting
Efficiency (luminaire and lamp)
Control
Daylight
Illumination levels
Water heating
Appliances
Industrial engineering
Energy rating (TCO – LCC)
Elevators & escalators
Computer energy saving modes
Power factor correction
Renewable energy
MAINTENANCE (Scheduled maintenance)
Etc.

12. Where to save – water heating

13. Where to save – Solar PV case
21kWp grid-connected solar PV

14. Energy Management Process
When?
New building – get it right first time
Existing building – any time or at trigger points:
sale of the property
change in the lease
replacement of equipment
refinancing, remodelling, renovation or rehabilitation

15. Energy Management Process

16. What is energy management
Goals
Lowest cost of energy
Efficient energy use
Use most appropriate technology
Ultimate goal
Sustainability
Zero net energy (ZNE) buildings

17. Energy audit Systematic assessment of energy use Sources
Where it is used
Variance between input and useage
Effectiveness and efficiency

18. Energy source

19. Energy monitoring

20. Secrets to success Broad organisational awareness Monitor and measure
Energy management plan – short & long term
Integrated into organisation management structure
Provide leadership (Champion) and a team
Top-down commitment expressed as policy

21. Energy is a manageable expense You can’t manage what you don’t measure (and report on) Thank you