Tim Fenn RIMA International Conference invited presentation 2014
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Presentation of data using reflective foil insulation within wall profile.
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Tim Fenn RIMA International Conference invited presentation 2014
- 2. Mind the Gap: Design versus “As Built” Performance Tim Fenn I-RIM Conference
- 3. Predicted Annual Energy Costs 100m2 House UK 2013 I-RIM Conference Annual Predicted Energy Cost: Gas & Electric Victorian House 1990's House Passivhaus Electricity £600 £600 £463 Lighting £104 £104 £10 Hot Water £340 £340 £170 Heating £1,000 £520 £60 Total £2,045 £1,565 £703
- 4. Annual Heating Demand I-RIM Conference 250KWh/m2/yr 130KWh/m2/yr 15KWh/m2/yr Victorian House 1990's House Passivhaus £4,000 £3,500 £3,000 £2,500 £2,000 £1,500 £1,000 £500 £0 Gas 0.04 £1,000 £520 £60 Oil 0.05 £1,250 £650 £75 Electric 0.15 £3,750 £1,950 £225 Annual Cost £ Annual Heating Cost (100m² house)
- 5. Annual Hot Water Demand CostKWh £ Annual £ Annual £ 8500 KWh/yr 4250 KWh/yr Victorian House Low Energy House I-RIM Conference £1,400 £1,200 £1,000 £800 £600 £400 £200 £0 Hot Water Gas 0.04 £340 £170 Hot Water Oil 0.05 £425 £213 Hot Water Electricity 0.15 £1,275 £638 Annual cost £ Annual Hot Water Demand and Cost
- 6. Variation in Performance: Germany I-RIM Conference
- 7. Target Killers: I-RIM Conference • What can you achieve with what building? • How much do you want/can afford to spend? & remember 1st 50% easy. • What planners/conservation officers will allow? • What your neighbours will allow or not do? • Site constraints?
- 8. Target Killer: Building Envelop I-RIM Conference • Insulation installation The GAP! • Piercing vapour barrier • Insulating pipework & thermal stores • Pipework runs • Incorrect materials
- 9. Target Killer: Materials I-RIM Conference • Wet insulation will not perform! • Deterioration in insulation performance over time? • Durability of tapes? • Wet building may take time to perform to its design spec?
- 10. Software Limitations I-RIM Conference In both SAP & PHPP • Sunspaces ignored • Radiant barriers ignored •Thermal mass? •Air leakage?
- 11. SAP VS PHPP I-RIM Conference 6000 5000 4000 3000 2000 1000 0 November December January February kWh Total Energy Consumption at Bakers Shaw PHPP Actual SAP
- 12. Hemcrete/Airflex Test Building I-RIM Conference
- 13. Hemcrete/Airflex Test Building I-RIM Conference
- 14. Wall Section and U Value I-RIM Conference
- 15. Wall Temperature Gradient I-RIM Conference 25 20 15 10 5 0 Inside Foil Front Foil Back Hemp Green Wall Outside 3rd Feb 11th Feb February Average Temperatures Benson
- 16. Conclusions I-RIM Conference • Vapour barrierreflective foil (if installed correctly!) adds significant improvement to building envelop performance better than predicted via software • Vapour barrier/reflective foil leads to highest levels of air-tightness in otherwise leaky buildings • UK needs more in situ research to understand gaps in performance
- 17. I-RIM Conference 2014 Questions?
- 18. Thank you! 800/279-4123 www.rimainternational.org