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Energy for Life Key Energy Efficiency and Renewable Energy strategies for service stations May 2013 Sustainable Efficiency …….through Objective Design
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Energy for Life
Key Energy Efficiency and Renewable Energy strategies for service stations
May 2013
Sustainable Efficiency…….through Objective Design
Energy for Life
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
Energy for Life
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
Energy for Life
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
Energy for Life
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
Energy for Life
Voltage Power optimisation – case study
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Energy for Life
Voltage Power optimisation – case study
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Energy for Life
Voltage Power optimisation – case study
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Energy for Life
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
Energy for Life
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
Energy for Life
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
Energy for Life
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
Energy for Life
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
Energy for Life
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
Energy for Life
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
Energy for Life
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?
Energy for Life
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
Energy for Life
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
Energy for Life
Service Station Retail TomorrowHigh Profile Visibility Green Initiative
Daylight Harvester
Energy for Life
Sustainable Daylight
Energy for Life
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
Energy for Life
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
Energy for Life
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
Energy for Life
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
