Beyond Zero Carbon Housing - David Bailey

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A one day symposium on zero/low carbon sustainable homes took place at The University of Nottingham on the 24th October, 2012. The event offered professionals within the construction industry a unique …

A one day symposium on zero/low carbon sustainable homes took place at The University of Nottingham on the 24th October, 2012. The event offered professionals within the construction industry a unique opportunity to gain added and significant insight into the innovations, policies and legislation which are driving the construction of zero/low carbon energy efficient homes both here in the UK and elsewhere in Europe. It explored solutions to sustainability issues “beyond” the zero carbon agenda. BZCH followed on from the successful ‘Towards Zero Carbon Housing’ symposium the University hosted in 2007. This event is part of the Europe Wide Ten Act10n project which is supported by the European Commission Intelligent Energy Europe.

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  • 1. Beyond ZeroCarbon Housingexploring solutions to sustainability issues beyond the zero carbon agenda2 4 th O c t o b e r 2 0 1 2 a t T h e U n i v e r s i t y o f N o t t i n g h a mDepartment of Architecture and Built Environment
  • 2. © Copyright Notice A l l t h e m a te r i a l i n t h e s e s l i d e sm ay n o t b e u s e d o r re p ro d u c e d w i t h o u t t h e ex p re s s p e r m i s s i o n o f t h e a u t h o rs
  • 3. Green Street – A Research Overview David BaileyDavid Bailey Dept. of Architecture & Built Environment, Faculty of EngineeringContact: University of Nottingham, Nottingham, NG7 2RD
  • 4. Research ContextTimber vs. Masonry DebateThis work forms part of alarger study looking to thepost occupancy performanceof sustainable housing in theUK with the aim ofdelivering more efficientbuildings in the light ofGovernment emissions targetswithin the building sector.
  • 5. The Green Street Case StudyThe case study development is located in theMeadows, Nottingham. The Green Streetdevelopment is a newly constructed housing schemeaccredited at CSH Level 4. The 8 houses underinvestigation incorporate both timber and masonryfabrication techniques and even have similarlayouts..
  • 6. Methodology Environmental Performance Evaluation Achieved through a mixture of fabric testing, computer modelling and ongoingperformance analysis of utilities and environmental conditions within the properties.
  • 7. Methodology• Co-Heat Testing • Air Permeability Testing• Thermography Fabric Testing • BUS Methodology• Computer Modelling • Life Cycle Analysis
  • 8. Handover Study - Introduction This paper seeks to address performance variability between design and as built performance in domestic applications by looking at the influences of occupant interaction.Modern sustainable housing requires a significant amount of technology orientedsolutions which in turn require some level of occupant interaction. Simply put, ifusers are not trained to employ these technologies in the proper manner, then they will not perform as specified.Thus the paper asks the question, have handover and training procedures targetingnew house owners evolved and become more formalised with the advent of morecomplex sustainable technologies and design concepts in the ecologically oriented housing sector?
  • 9. ResultsThe results and key themes of the study show:• Demonstrators are not aware of the significance of sustainability and the impactthat occupant behaviour has on the performance of a house.• Demonstrators struggle to understand many sustainable technologies and conceptswhich are taken for granted within the modern sustainable housing industry.• Demonstrators struggle to appropriately communicate worthwhile information inthe standard 1 hour tour and handover manual format.The figures also support the notion that practical explanation is not necessarilyindicative of sustainable instruction. Behavioural determinants are often addressedadequately in terms of functionality but the demonstrator pays little attention to thesustainability.
  • 10. ConclusionsThe study shows occupants are not receiving appropriate guidance andencouragement. It suggests that occupants struggle to absorb the amount ofcomplex information provided.The solution must focus on thepresenting the information in anappropriate manner.Ultimately ever stricter ecological standards employed in housing necessitates acomplete reform of the handover process. The precedence exists in the form ofthe Soft Landings Framework (BSRIA, 2009) currently used in commercialapplications.
  • 11. Air-tightness Testing - IntroductionAir-tightness is an integral component in thedevelopment of sustainable construction.Impacts:• Building energy performance,• Thermal comfort• Indoor air quality The premise of this paper is that the current regulations are not stringent enough, they have too many holes and not enough failsafes.
  • 12. Air-tightness Testing - ResultsMinimum air-permiability for theeffectiveness of MVHR - 3 m3/h/m2.Only a percentage of housing is tested.Remedial measures to ensure thesehouses pass the specified level are notapplied to the entire site. The result is housing that is designed and constructed to reach a stringent and sustainable level of air-permibility, but in reality falls below this standard. DESIGN vs. AS-BUILT PERFORMANCE
  • 13. Thermography – Internal Garages Despite being constructed to Building Regulations, thermal imaging would suggest that internal garage walls should perform to the same standard as external walls, as the garage is an un-heated space.
  • 14. THANK YOU FOR LISTENING. Any Questions?