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Insights and Conclusions from the Warwick Wind Trials on Building-Mounted Micro-Wind Turbines

This document summarizes the findings of the first large-scale public field trial of building-mounted micro-wind turbines conducted on March 19, 2009. The trial aimed to evaluate site suitability, analyze wind speeds, and assess energy output and power curves of various turbine models. Key findings include significant discrepancies between predicted and actual wind speeds, highlighting the need for improved scaling factors and industry standards for power curve reporting. The work serves as a basis for informed customer decision-making and technology advancement in microgeneration.

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Insights and Conclusions from the Warwick Wind Trials on Building-Mounted Micro-Wind Turbines

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  1. Conclusions and empirical data from the first large scale public field trial of building mounted micro-wind turbines Helen Brown +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  2. Agenda • Objectives and background • Methods and scope • Data analysis • Wind speeds • Scaling factors • Energy • Power curves • Conclusions +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  3. 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 Informed customers are the key +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  4. Objectives and backgroundFunders • Turbine owners • Formal sponsors • Supporters • Data customers Sponsors Supporters +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  5. Methods and scopeSites +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  6. Methods and scopeTurbines Ampair 600 Air Dolphin Z1000 StealthGen D400 Windsave WS1200 Swift +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  7. Methods and scopeInstrumentation • PEET Kit • Meteo Anemometer • Novus Logbox DA • Iskrameco ME162 Watt meter • BRE Kit • NRG Anemometer • Pace Scientific XR5-SE • Iskrameco ME162 Watt meter +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  8. Data analysisFundamentals The fundamental question from a customer perspective is... How accurately can we predict output from building mounted micro-wind turbines? +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  9. Data analysisFundamentals +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  10. Data analysisWind speeds +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  11. 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 +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  12. Data analysisScaling factors • MIS 3003 – scaling for annual average wind speed • Encraft scheme – scaling for wind speed and “k” +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  13. Data analysisFundamentals +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  14. Data analysisEnergy Lillington Road (domestic property in built up area) Turbine: Ampair 600 +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  15. Data analysisEnergy Birds Hill (domestic property in built up area) Turbine: Eclectic StealthGen D400 +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  16. Data analysisPower curves West Staddon (domestic property in rural area) Turbine: Windsave WS1200 +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  17. Data analysisPower curves Eden Court 2 (isolated, high rise block of flats) Turbine: Ampair 600 +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  18. Data analysisEnergy • 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 +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  19. 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. +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

  20. www.warwickwindtrials.org.uk +441926 312159 www.encraft.co.uk 6b Park St Leamington Spa CV32 4QN UK 19th March 2009 Warwick Wind Trials

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