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Paraparaumu Library

Case Study : Design and In-Use Performance Assessment Brendon Dwyer – Beca Carter Hollings & Ferner. Paraparaumu Library. Paraparaumu Library – Project Details. Kapiti District Council Kapiti Coast 1,750m2 Opened Nov 2002 ~ $5.8m Construction Library, Office, Meeting Rooms, Archives.

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Paraparaumu Library

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  1. Case Study : Design and In-Use Performance Assessment Brendon Dwyer – Beca Carter Hollings & Ferner Paraparaumu Library

  2. Paraparaumu Library – Project Details • Kapiti District Council • Kapiti Coast • 1,750m2 • Opened Nov 2002 • ~ $5.8m Construction • Library, Office, Meeting Rooms, Archives

  3. Paraparaumu Library – Project Team • Kapiti District Council • Warren & Mahoney • Beca Carter Hollings & Ferner • Maltby & Partners • Connell Wagner • Fletcher Construction

  4. Project Brief • Quality architectural building • Community amenity • Low energy building • Best value and Whole-Life-Cost • Maximise natural daylight • Avoid air-conditioning • Maintain comfort conditions • Provide safe and healthy environment • Provide indoor – outdoor flow • Environmentally responsible

  5. Design Process • Integrated design process • Integrated solutions • Architectural • Structural • Services • Value and cost • Concept stage testing and refinement • Latest 3D building modeling tools

  6. Design Considerations • Minimising building loads • Building orientation • Shading strategy • Fabric investigation • Internal load control • Maximising natural light • Minimising artificial light • Passive design • Thermal mass

  7. Underfloor Labyrinth Detail

  8. Key Design Strategy

  9. Design Testing – Thermal Modeling • Testing design concepts • Predicting in-use performance • Evaluate benefits of floor plenum • Test WLC • Value engineer

  10. Thermal Modeling - Feedback • Significant energy savings ~ 1/3 savings • Need to minimise building loads • Enhanced Insulation • External shading • Orientation • Double glazing • Lighting type and zoning • Significant savings on AC – Offset additional cost of fabric controls

  11. Key Design Features • Labyrinth double slab air tempering • Displacement ventilation • External solar shading and overhangs • Enhanced insulation • Enhanced thermal mass • Internal height and stratification • Natural Daylight

  12. Key Operational Features • Overnight ventilation to pre-cool structure • Demand controlled ventilation strategy • Natural ventilation, and indoor/outdoor flow • Intelligent building controls system • Lighting switching zones align with natural daylight availability

  13. Environmental Considerations • Enhanced indoor air quality • 100% Outdoor air supply • Displacement ventilation – high IAQ • Energy efficiency – passive design • Water efficiency • Low use fittings • Rainwater recovery • Materials selections • Waste Management plan

  14. Lifecycle costs • Life-cycle analysis undertaken • Integrated, passive system: • 1/3 savings on energy predicted • $50k savings on traditional ac system utilised in building fabric enhancements • 56% life cycle cost of traditional AC system • Estimated $280k whole of life cost savings (economic life) • All within budget

  15. Award Winning Built Solution • ESD Whole building approach • Supreme NZIA Arch Award – 2004 • Silver Award ACE Innovate 2004

  16. But how did it perform?

  17. Thermal Performance • Extensive building modeling • First year in operation • Hotter summer than design • Cooler winter than design • Building performed consistent with computer simulations • Labyrinth? • Reduced the supply air temperature by 2-3 degrees (slightly better than anticipated) • Building tuning within first 12 months

  18. Thermal Performance – On Site

  19. Performance AssessmentThe User’s Perspective • Independent post occupancy review • Victoria University – School of Architecture • Building Use Studies – Workplace questionnaire

  20. Building Use Studies (BUS) - Workplace • Developed in UK, and refined over 2 decades • In-use performance review • 7 point scale • Over 400 buildings globally • Ability to benchmark performance • Comparison with Mean • Upper and lower 95% confidence intervals • (Based on previous 50 buildings)

  21. Building Use Studies (BUS) - Workplace • Questionnaire includes: • Building overall • Work area and requirements • Thermal comfort (summer and winter) • Air quality and lighting • Noise and overall comfort • Productivity, Health and personal control • Questionnaire • Staff version • Visitor version

  22. Building Use Studies (BUS) - Workplace • Responses are analysed to assess: • Comfort Index • Satisfaction Index • Averaged to produce Summary Index • Forgiveness factor • Overall score

  23. BUS - Results • Very Good - Rating of 7 on 7 point scale • 95% on the 100-point scale • Top 5% of all buildings reviewed

  24. Summary • Integrated design process • Life cycle assessment – value orientated • Health and environmental focus • Award winning building • Continuous tuning during occupation • Optimisation of facilities • Top performance measure • Increased patronage • = Whole Life Focus

  25. Current Trends – Design + • NZ Green Building Council • MfE – Value Case for Sustainable Buildings – Feb ’06 • Mfe – Sustainable Government Buildings. Beyond design. Building commissioning, completion and ongoing operation – June ‘07

  26. Future Focus • Environmental footprint • Carbon Neutrality • Sustainable Buildings • Existing Building stock

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