cecil van niekerk, construction & engineering manager, engen
DESCRIPTION
With the expected Eskom increases over the next five years, retail petroleum service stations are facing reduced profitability and some even closure as profits are continually eroded by rising operating costs. Electricity is one of the costs that can be managed and self generated. This conference aims to examine best practices in energy efficiency and unpack the options and complexities of generating electricity from renewable energy specifically for retail fuel sites.TRANSCRIPT
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