Best Practises and Lessons learned from Green interventions at Engen service stations in Africa

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Agenda - IBD Green Road Map -Process followed-Interventions implemented-Rundu - the greenest service station site in Africa?-Next steps

IBD : Green Road Map Understand the greatest impacts

- Start with Retail Service Stations- then depots and offices- Encourage our partners to participate…..Wimpy & Corner

Bakery- Go for the quick wins- Gain credibility and support for initiatives- Expand on successes

Get the Dealers to buy-in- Before and after measurements- Prove the claims

Process followed -9 step process-Key areas

- Behaviour and Procedure- Technology

Step 1 : Audit - Operational and Behavioural change

- 15-20% savings possible

- Identify Opportunities- Observe procedures e.g. opening- Influence and educate- Implement (Training manuals)

Switch off when not in usePre-heating is 10 mins

Turn off the light

Report leaks

Step 2 : Audit - Identify Power consumers

- Prioritise interventions based on:- Contribution to site- Capex Cost and payback

Step 3 : Audit - Occupancy Audits- Measure:

• When the lights are on• When the room is occupied

- Result – 10-90% savings potential with Sensor control

Step 4 : Audit - Lux Audits

• Are areas over lit? • Identify, redesign and

change light fittings

• Consider:– OHS Act– Marketers needs– E.g. Wimpy 25% over lit

Step 5 : Design - Thermal Modelling

• Optimise Building orientation for lowest thermal gain• Benefits:

– Reduced demand on HVAC

– Increased shade on shop fronts

Step 6 : Design - Challenge the current standards

• Replace black ceilings with white for improved light reflection

• Use reflective paint on walls and ceilings……light & space• Soften the angle on the vertical bulkheads to deflect light

Angled bulkhead White ceiling

Step 7: Design - Value Engineering

As a result of ongoing monitoring of Demand Profiles across sites- Site Power Infrastructure down graded:

– From 250kVA to 100kVA (Target is 50 kVA)– Lighter supply cables– Generator downsized by 150kVA

Step 8: Our Partners - Wimpy and Corner Bakery

• Agreement reached on reduction of lux levels• Scrapping of dropped ceilings and bulkheads so as not to

block out the daylight• CO2 and Humidity sensors on extract fans : instead of

operating 24/7, fans now activated by grilling activity• Variable speed drives fitted to extractor fans • Motion sensors in stores and cold rooms• Move towards gas appliances where feasible• Investigating induction cookers • Access to training manuals

• Staggered start

Step 9 : Roll out interventions

Roll out the interventions!

Interventions implemented -Pilot approach

- Analyse opportunities- Research emerging technologies- Design solutions- Implement solutions- Measure results- Roll out success stories

1) Measuring and Managing- On site remote metering

• Pro-active Demand Management• Voltage Optimisation• Tariff Analysis• Invoice Verification• Carbon Footprint

2) Day-light Harvesting- Lighting accounts for 22% of electricity costs- 90% saving during daylight hours- Ceilings have to be white for reflecting light- Under ceiling bulkheads need to tilt at 60 degrees to deflect light onto shelving

3) Indirect Evaporative Cooling – Solar powered

- AC Cooling accounts for 23% of Electricity costs Powered by PV panels (reverts to grid after hours)

The saving is R 51,888 pa

Rundu 1 Stop:C Conventional AC: 30 kVA

Indirect Evap Cooling:

2.1 kVA

4) Reflective roof coating

- AC Cooling 23% & Refrigeration 16% of Site- Reduces load on cooling

5) LED Bi-Level Canopy Lighting with sensor

• LED Canopy lights with a light and motion sensor• Proven saving of 90% versus the 400w metal halide

6) LED Lighting Internally with lux and motion sensors

• LED lighting throughout • Sensor automatically maintains lux levels • Motion sensors in stores and cold rooms switch off

automatically• No light switches in service areas

* LED – Light Omitting Diodes

7) Voltage Optimisation

• Direct the mains supply via a voltage optimiser tapping the voltage down to 216 - 222 range

• Benefits:

– Voltage spike protection

– Power factor correction

– Improved Harmonics

– Reduced maintenance costs

– Guarantees on projected savings

– Only pay for 222 volts

– Saving of 16%

8) Hot Water – Solar

• Benefits:

– Grid independence

– Reduced electricity costs

OR: Hot Water - Heat Pump

• Benefits:

– Hot water generated at a high co-efficient of performance

– Water heated on demand

– Not limited by sunlight

9) Solar Roof Void Venting Fan

• Benefits:

– Air-conditioning units operate at lower capacity due to the reduced heat in the roof void

– Enhances the life of the Air-conditioning Equipment

10) Isofoil Roof Insulation

• Benefits:

– Double the current insulation : Greater U Value

– Eco-Friendly : made from recycled coke bottles

11) Thermal Imaging

• Use Infrared imagery to evaluate the air-tightness of building

• Benefits:

– Reduced demand on HVAC

– Ensure proper installation by contractors

– Identify areas to be improved at existing sites

12) Window Films

• Benefits:

– Reduce solar gain through windows

– Reduced sunlight on perishables

– Staff comfort

13) Water-wise fittings

• Benefits:

– Water savings : Waterless Urinals, Flapper-less Toilets, Aerated taps and low-flow shower fittings

– 100% saving on urinals

– 30% on others

14) Site Water Harvesting

• Rainwater harvesting• Benefits:

– Free resource

– Currently used for watering

– Will be developed for toilet flushing

15) On site power generation

• 3kW PV array piloted to run air conditioning• 5 year < payback• Roll out where:

• Grid unstable• Use of generator is significant (R4 per kWh)• Electricity Costs justify payback

Other Interventions implemented

• Signage internals all LED• LED strip lighting in fridge doors• Trees for shading• Awareness: TV monitor indicating power usage and

carbon footprint• Food probe for refrigeration optimisation

TV screen on

the bulkhead

Interventions in the pipeline

• Wind turbines• Hot water heat recovery from AC• Integrated refrigeration• Automated Demand switching• On site vapour recovery

Rundu Namibia: Greenest site in Africa?

• 32 interventions implemented

Rundu Namibia: Greenest site in Africa?

Consumption comparison

Consumption comparison

Next steps in the road map

• Solar PV project roll out• Depot energy efficiency audits

Thank you