Conclusions and empirical data from the first large scale public field trial of building mounted micro-wind turbines
Helen Brown
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Agenda
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
• Objectives and background• Methods and scope• Data analysis
– Wind speeds– Scaling factors– Energy– Power curves
• Conclusions
Objectives and backgroundWhy did we do this?
Encraft is a low carbon technology consultancy established to accelerate the creation of an accessible mass market for
microgeneration technologies in the UK
consultancy – software and design tools – project engineering
Over 500 projects since 2003
Independent and impartial
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Informed customers are the keyInformed customers are the key
Objectives and backgroundFunders
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Sponsors Supporters
• Turbine owners• Formal sponsors• Supporters• Data customers
Methods and scopeSites
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Methods and scopeTurbines
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Ampair 600
Windsave WS1200
StealthGen D400
Air Dolphin Z1000
Swift
Methods and scopeInstrumentation
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
• PEET Kit– Meteo Anemometer– Novus Logbox DA– Iskrameco ME162 Watt meter
• BRE Kit– NRG Anemometer– Pace Scientific XR5-SE– Iskrameco ME162 Watt meter
Data analysisFundamentals
The fundamental question from a customer perspective is...
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
How accurately can we predict output from building mounted
micro-wind turbines?
How accurately can we predict output from building mounted
micro-wind turbines?
Data analysisFundamentals
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Data analysisWind speeds
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Data analysisWind speeds
• Measured average wind speed is >40% lower than NOABL prediction at 16 sites
• Weibull shape factor is less than 1.6 at 18 sites
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Data analysisScaling factors
Energy output predictions based on...
NOABL
... will overestimate by an approximate factor of...
16
scaled NOABL 2
measured wind speeds 2
• MIS 3003 – scaling for annual average wind speed• Encraft scheme – scaling for wind speed and “k”
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Data analysisFundamentals
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Data analysisEnergy
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Lillington Road (domestic property
in built up area)
Turbine:
Ampair 600
Turbine:
Ampair 600
Data analysisEnergy
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Birds Hill (domestic property
in built up area)
Turbine:
Eclectic StealthGen
D400
Turbine:
Eclectic StealthGen
D400
Data analysisPower curves
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
West Staddon (domestic property
in rural area)
Turbine:
Windsave WS1200
Turbine:
Windsave WS1200
Data analysisPower curves
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
Eden Court 2 (isolated, high rise
block of flats)
Turbine:
Ampair 600
Turbine:
Ampair 600
Data analysisEnergy
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
• Average energy exported per day per turbine– 628 Wh
(only including times when turbines were switched on)
– 214 Wh (including times when turbines were broken or switched off for maintenance)
• Average energy consumed per day per turbine– 80 Wh
Conclusions
• Great care should be taken in selecting suitable sites for building-mounted turbines.
• Scaling factors for NOABL and the Weibull shape factor may improve wind speed predictions although more work is required in this area.
• Our data shows the (now recognised) need for an industry standard that normalises the way in which manufacturers’ power curves are produced and this data should be published.
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK
www.warwickwindtrials.org.uk
19th March 2009 Warwick Wind Trials+441926 312159
www.encraft.co.uk6b Park St Leamington Spa CV32 4QN UK