Green Building Council of Namibia Glenn Howard – Emcon Consulting Engineers.

Principles of Energy Management in

BuildingsGreen Building Council of NamibiaGlenn Howard – Emcon Consulting

Engineers

The case for energy management in buildings◦ Why?◦ How much?

Do we use? Can we save?

◦ Where can we save?◦ What is the process?

Energy Management in Buildings

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

Energy Management: Why bother?

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%

Green Star SA - Rating Tool

Why existing buildings?

1% New build & refurb

99 %

Existing Buildings

How much energy?

How much demand?

How much can be saved?

N$1.95M/annum

N$470k/annumN$2.7M/annum

How much can be saved?

Market rentalsA-Grade offices 120-135 N$/m²Commercial 180-300 N$/m²

Is there a business case?

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.

Where to save

Where to save – water heating

Where to save – Solar PV case

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

Energy Management Process

Energy Management Process

Goals◦ Lowest cost of energy◦ Efficient energy use◦ Use most appropriate technology

Ultimate goal◦ Sustainability◦ Zero net energy (ZNE) buildings

What is energy management

Systematic assessment of energy use◦ Sources◦ Where it is used◦ Variance between input and useage◦ Effectiveness and efficiency

Energy audit

Energy source

Energy monitoring

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

Secrets to success

Energy is a manageable expense

You can’t manage what you don’t measure (and report on)

Thank you