Energy for Life
Key Energy Efficiency and Renewable Energy strategies for service stations
May 2013
Sustainable Efficiency…….through Objective Design
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Agenda
– Energy efficiency– Switching and control– Voltage Power optimisation– Indirect Evaporative cooling
– Renewable energy– Daylighting– On site generation with solar PV
– Incentives, Financing & Funding– The future energy landscape
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Switching and control
– Next step from metering– Technology advances Cost effective– Mini BMS now possible / affordable– Automate procedural change
– Switch circuits on a schedule– Hot water off – off peak/after hours– Extractor fan off – off peak/after hours– Lighting off – BOH after hours
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Switching and control
– Automate procedural change– Demand and consumption control
– Set energy budget e.g. R15 000 per month– Budget is broken down into 15 minute cycles– Loads are prioritised for switching
– P1 – Lighting BOH non essential off– P2 – AC set-point adjusted by 1-2 Degrees C – P3 – BOH staff facilities– P4 – Hot water off– P5 - dim FOH Lighting by 10% e.g. 600 – 540 lux
– Switch circuits to smooth demand peaks and consumption – Dim lights by 10% on peak alert– Adjust AC– Switch off hot water
– Automatically achieve saving targets
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Voltage Power optimisation
– Many sites in SA (and Africa) suffer from over voltage– Causes
– Increased consumption (kWh)– Higher peak demand (kVa)– Increased ware and tear on equipment
– Solution– Tap down voltage levels to designed levels
– Results– Reduced consumption (kWh)– Lower peak demand (kVa)
– Most effective on the following loads– AC, Refrigeration and T8/HID lighting
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Voltage Power optimisation – case study
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Voltage Power optimisation – case study
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Voltage Power optimisation – case study
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Voltage Power optimisation – case study
– Results– Savings
– 32.78% kVa– 21.41% kWh– N$ 3 157 kVa p.m.– N$ 3 697 kWh p.m.– N$ 6 854 Total p.m.
– Payback 1.5 years
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Indirect Evaporative cooling
– Cooling 20-30% of site load– Full cooling or pre-cooling approach– Displacement cooling design– Up to 90% saving versus standard DX refrigerated systems– Payback under 2 years
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Daylighting - Introduction
– Daylight first design principle– Use daylight before artificial light– Use sun’s renewable resource
– Types of daylight– Architectural e.g. windows, clerestory– Passive – skylights, solar tubes– Active
– What is the effective measure?– How often are the lights off?– Daylight autonomy – number of hours
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1. ACTIVE (Smart)Up to 60% more hours of sunlight
100,000 Lumens 5 Suns
3. INDIRECT (Highest Quality) No hot-spots No heat gain No UV
2. COLLIMATED (Smarter) Daylight ANYWHERE
RETROFIT LARGE SPACES WITH ONLY ONE 24” HOLE
The Sundolier Daylighting Solution
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Integrated Renewable EnergyFor Off-Grid 24/7 operation
Integrated LED lights + ControllerFor seamless 24h Hybrid lighting
Fixture Catalogue
Custom Artist Fixture
TECHNOLOGY DESIGN
Daylight Looks & Feels GoodIntegrated Turnkey Systems
Quality Indirect Daylight
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Daylighting – what is the business case?
Interior Daylight Creates ValueFor Retail
• 6-11% Average HIGHER SALES
• 20% Better Cognitive Performance
• Great Color Rendering
• Substantial Employee Retention, Attendance, Health
• Lower Energy Consumption, Reduced Carbon
• Enhanced Image
Independent research confirmed by
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Pro Forma for a SS Retail Store
Retail Floor space: 100 sq. m.Monthly Sales per sqm.: R2 500 Daylight Sales Increase: 5.0%
R150 000Extra Profit (@ 50% margin): R 75 000
Daylighting Cost (1 Sundolier): R250 000
Return on Investment: 3.3 Years
Note: not including - energy, reduced carbon
- associate productivity, retention, health, wellness- enhanced image
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Daylight. Sell More. Tested Daylighting in 1993
RESULTS
Increased in sales
Associates are more productive, happier, healthier
Lower Energy & Carbon
General Lighting off on Sunny Days
Today 2,900 Walmart stores have Daylighting
Daylighting – who’s done in retail?
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Engen Rundu - Case study
– 1 Sundolier lights the retail shop, central area and Wimpy (150 sqm)
– Designed to 350-400 lux on shelf– Lux Sensor control to dim LED back up lighting– Implemented end of June 2011– 90% saving on lighting
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Engen Commerce Park - Case study
– 1 Sundolier lights the retail shop space (90 sqm)– Designed to 450-500 lux on shelf– Lux Sensor control to dim LED back up lighting– Implemented end of April 2012– Projected 90% saving on lighting– Results
– Jury is still out– Retail sales being measured– Energy savings being measured
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Service Station Retail TomorrowHigh Profile Visibility Green Initiative
Daylight Harvester
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Sustainable Daylight
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On site PV power generation
– Design approach– Use all space available
– Canopy– Building roof– Carports
– Assess structural integrity– Only use battery storage where:
– Grid instability e.g. load shedding– Generator operates often – R4 per kWh– Cost effective demand smoothing– Address supply shortages when expanding
– Design to cater for average daily load – Average 50-100 kW array possible
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On site PV power generation
– Cost – R20-25 per watt installed– R2 000 000 – 2 500 000 for 100kW array
– Payback – 5 years with Eskom SOP– 6.5 years without Eskom SOP
– Qualifying tariff– Key tariff value point of R1.60 per kWh– Improves if include peak demand if peak during daylight hours
– Infrastructure lifespan– 25 years (80% efficiency) guarantee on panels– 10 year Inverter guarantee
– Factor in Net metering – CT & PE
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Eskom SOP
– Small scale on site generation– R1.20 per kWh generated– 20-30% of PV Capital cost– Pilot phase just completed– Awaiting roll out approval Eskom/Nersa
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USA based funding
– 2 USA agencies– OPIC– EXIM
– Specialist Energy efficiency and RET funding for emerging markets– Terms
– 85-100% of project value– 10-18 years loans– 2 to 3% fixed interest rate
– US technology partners– Suniva for PV projects– Sundolier for daylighting projects– Coolerado for cooling projects
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The future - EV charge station
– Driver : EV business case– Operating cost per km
– EV’s electrical R0.14 to R0.22/km– Liquid fuel R1.40 to R2.20/km
– Comparable vehicle costs with Govt. incentives– Fast charge station network plan
– Hotels– Rental cars– Service stations
– Charge station infrastructure– 1MWp /2500MWh Solar PV plant, Energy Storage and Fast
charging stations– R0.50 per km over 5 years
– Benefit of increased retail opportunity
