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Marco Molinari, Ph.D. Department of Automatic Control, KTH

The importance of the design phase in Energy Quality Management: an example of the application of the parametric analysis. Marco Molinari, Ph.D. Department of Automatic Control, KTH. Outline. Background Energy efficiency targets in the built environment Tools for analysis: S.E.P.E.

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Marco Molinari, Ph.D. Department of Automatic Control, KTH

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  1. The importance of the design phase in Energy Quality Management: an example of the application of the parametric analysis Marco Molinari, Ph.D. Department of Automatic Control, KTH

  2. Outline • Background • Energy efficiency targets in the built environment • Tools for analysis: S.E.P.E. • S.E.P.E.in practice: performance improvement with exergy analysis • GSHP improvement through integrated design • Current research • Conclusions

  3. 87% Energy use in the world: the need for reduced and more sustainable energy use 32% Source: IEA 2010 Source: IEA 2011

  4. Energy and exergy efficiency Energy supply type in buildings Source: Fraunhofer IBP Source: Mure Odyssey database

  5. Can we improve our energy management by means of exergy concepts? • Energy quality (exergy) mismatch between supply and demand indicates potential for energy management improvements • Main hindrances: • Lack of a shared understanding of the advantages of the exergy approach • No standardized exergy analysis calculation tools available • Need for demonstration projects

  6. Examples of available exergy analysis software programs: IEA ECBCS Annex 49 • Human Body Exergy Calculation • Cascadia – An Exergetic Approach to NeighbourhoodDesign • Pre-Design Tool for buildings exergy analysis • DPV Tool • S.E.P.E. – Software for Exergy Performance Assessment

  7. S.E.P.E. HVAC components • Generators • HPs, • chillers • boilers • solar collectors • DH • Heat exchangers • Distribution components • Ducts/pipes • Fans and pumps • Emission systems • radiators • FH • air units • controllers • Simplified building envelope

  8. Component example: boiler

  9. Example of S.E.P.E. HVAC system assembly

  10. Improvement of heat pumps COP performance with S.E.P.E. Reservoir T2 DHW Heat Exchanger 1 T11= 55° T10 T4 T9 T12= 10°C • Heat Pump 1 • Heat Pump 2 P2 Floor Heating System Heat Exchanger 2 T5 T8 Tset= 22°C Reservoir T1 Heat Exchanger 3 T7 T3 P1 Reservoir T0 T6

  11. Results The same physical system can achieve different performance if the subsystems are not properly matched

  12. How to extend these results to other fields: design of ground source heat pumps • Building heated area: 8000 m2 • Locations: Stockholm and Madrid • Parametric study • Building envelope • Walls and roof insulation • Borehole field • Borehole spacing • Number of boreholes http://sustainableenergysystemz.com/the-benefits-of-ground-source-heat-pumps/1679/

  13. Results: Madrid Results: Stockholm

  14. Current research at KTH: advanced control strategies in buildings

  15. Conclusions • Conceptual and calculation tools for energy quality management already exist and are now mature enough to shift from research to applications • The application of exergy concepts can be highly valuable to the improvement of the design of buildings, especially in connection to parametric analysis • Examples of improved design of buildings and buildings components based on exergy principles are needed to show the potential improvements in energy quality management • Advanced controls schemes and exergy can be an innovative match to further decrease the overall energy used in buildings

  16. Thank you for your attention!

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