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SASBE conference 2009, Delft

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presentation of joined paper 'Expanding exergy concept to urban water cycle'

presentation of joined paper 'Expanding exergy concept to urban water cycle'

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  • Energy and water critical flows: vital for human well being and for functioning of cities e.g., most efficient dutch power plant reaches only an efficiency-level of 55 %, 45 % wasted as heat; for water: 30 % of potable water used for toilet flushing
  • Study un-used potentials, taking stock, conversion technologies, storage, demand & supply, recycle, re-use
  • Can learn from each other and strengthen each other
  • Transcript

    • 1. Expanding Exergy concept to Urban Water cycle Wouter Leduc, Claudia Agudelo, Adriaan Mels & Ronald Rovers Urban Environment Group – Wageningen University Polytechnic University Zuyd, Heerlen
    • 2. Problem
      • Growing urbanization  increasing pressure on available resources
      • Urban impacts on resource depletion + environment by use and waste production
      • Decreasing supply of resources, increasing dependency, more border conflicts
    • 3. Background
      • Energy and water cycles  vital to support urban life
      • Focal point of technology development
      • But, technological achievements not sufficient to guarantee urban sustainability
      • Cycles managed separately and non-efficient use of resources
    • 4. Aim
      • Urban resources management as key consideration of urban planning
      • Focus on harvesting potential urban resources
    • 5. Concepts
      • Exergy = non-used fraction of energy (notion of energy quality)
      • Urban Harvest Approach
      OUT IN Through Recycle
    • 6. Research questions
      • Can exergy concept be expanded to water cycle?
        • Exergy = use of the non-used water
        • (-fraction)?
      • To what extend are energy and water cycles comparable?
      • What + how to learn from each other to optimize management?
    • 7. Approach
      • Natural energy and water cycles modified by metabolic profiles of cities
      • For urban planning processes  shared framework required
        • To model + understand dynamics
        • To achieve integrated management of resources
    • 8. Approach
      • To optimize + close cycle at high efficiency level
      • Exergy used to cope with complexity of varying metabolic profile
      • Exergy used to understand energy cycle in built environment
    • 9. Comparison
      • Comparison of energy and water cycles on:
        • Several levels
        • Less efficient vs. more efficient system (local scale = urban)
    • 10. Energy and Water cycles – global scale Oil/gas reserves Lake Geothermal energy Ground water Reflection Evaporation Infiltration Runoff Heat losses
    • 11. Urban Energy and Water systems – local scale Input Output Transformation Supplier Emissions
    • 12. Energy and Water qualities in Urban systems – local scale Use 1 Use 2 Use n Qs Q supplied ΔQr Qs = Quality surplus ΔQr = Un-used remaining quality ΔQr ΔQr Qs Q U A L I T Y High Low Supply Demand Source 1 Source 2 Conversion Emissions
    • 13. Coupling supply and demand - local ΔQ High Water cascading in the urban area Heat cascading in the urban area Water system, quality Closed water loops in the urban area Multi-sourcing in the urban area Multi-sourcing in the urban area Energy system, temperature Residential areas Power Plant Industry Green houses Offices ΔT Low Solar energy High Residential areas Offices Green houses Industry Rain water Low
    • 14. Urban Energy and Water Planning – current approach
      • Existing developments: no focus on studying several problem solutions
      • Resources extracted from abroad, used, and waste released
      • Separate management of urban flows
      • Local potentials are overlooked
      •  Change in urban planning needed
    • 15. Urban Energy and Water Planning – new approach
      • Study local potentials of primary and secondary resources
      • Aim for strategic urban resources management
      • Involves supply and demand (qualities and quantities), and spatial and temporal implications together
    • 16. Guiding planning principles for urban flows
      • Avoid converters, each conversion consumes energy
      • Promote cascading
      • Prefer local resources
    • 17. Conclusions
      • Urban energy and water flows comparable:
        • Exergy applies for energy and water, both have un-used fractions
        • System on several scales comparable, global and local
      • Better to
        • Tackle Urban energy and water planning together
        • Apply similar approach
    • 18. Further research
      • Reach integrated urban planning
      • Study real applicability
      • Develop detailed planning rules to maximize urban harvesting
      • Study applicability of exergy concept in other urban flows, e.g. materials
    • 19. Thank You! Questions? Thursday 18 th , 9:00, SREX-workshop