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Eco-Factor Design Method for Indoor Climate & Energy Evaluation

A method developed to interpret building system performance, considering factors like IAQ, energy use, emissions, and thermal comfort. It offers a tool for architects and builders to assess environmental impacts and improve indoor climate quality efficiently.

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Eco-Factor Design Method for Indoor Climate & Energy Evaluation

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  1. Eco-Factor design method Åsa WahlströmSP Swedish National Testing and Research InstituteHenrik BrohusAalborg University 4th Annex 44 Forum / TORINO / 29 march 2006

  2. Outdoor environmental impact Effective energy use (cost) The performance of the building – a question of system Adequate Indoor climate(gain) Åsa Wahlström

  3. Difficult to overview the impact of the environment Use of electricity, heating and cooling Gain in indoor climate Overall thermal balance CO CO2 NOx Radiant temperature asymmetry IAQ Particles SOx Local discomfort N2O Vertical temperature gradient NMVOC Draught NH3 CH4 Warm or cold floors Åsa Wahlström

  4. Objective -to develop a method that assists in interpretation and evaluation of the performance of different system solutions Client Architect Builder Åsa Wahlström

  5. Interdisplinary development of a new simple tool Åsa Wahlström

  6. Eco-factor for indoor climate • IAQ • Thermal comfort • Overall thermal comfort • Local thermal comfort • Draught • Air temperature gradient • Radiant temperature asymmetry • Warm/cold floors Åsa Wahlström

  7. 100% Eco-factor • Minimum percentages dissatisfied (ISO 7730) • 50% Eco-factor • Medium level of expectations (CR 1752, Case B) Score-function for indoor climate Åsa Wahlström

  8. Eco-factor for energy use • Energy use for each energy source • Emissions from each energy source • Impact: Established environmental • assessment methods • (EPS, Eco-indicator 99 etc.) Åsa Wahlström

  9. 100% Eco-factor • - No emissions • 25% Eco-factor - Emissions from an average European office Score-function for energy use Åsa Wahlström

  10. Eco-factor for visualization of performance Åsa Wahlström

  11. Input, Eco-factor Tool, 1 Åsa Wahlström

  12. Input, Eco-factor Tool, 2 Åsa Wahlström

  13. Output, Eco-factor Tool, 1 Åsa Wahlström

  14. Output, Eco-factor Tool, 2 Åsa Wahlström

  15. We find the ”missing” points in the IP Example B&O headquarter Åsa Wahlström

  16. Alternative Energy Source ( 9 %) Åsa Wahlström

  17. Total Eco-factor = 60 % Indoor climate Energy • Spreadsheet based tool, • Easily accessible in practise • Both energy use and indoor climate • Relatively quickly provide an visual presentation • Easy to understand and communicate with one common scale • Based on physical indicators and evaluation methods that are already well-known and recognized in the building community Conclusions Åsa Wahlström

  18. Total Eco-factor = 60 % Energy Indoor climate • Supports an iterative procedure, useful for “integrated design” • Immediate feedback on design changes • Communication: experts vs. non-experts • Ranking of solutions • Encourage a comprehensive view Conclusions Åsa Wahlström

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