Igra hamburg2013 cmr


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Presentation at the IGRA congres Hamburg May 14th 2013 about first research results on Green Roof Specifications and Uniform methods for calculations and measuring at Rotterdam University of Applied Science

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Igra hamburg2013 cmr

  1. 1. ©2013 dr.drs.ir. Christoph Maria RaveslootTechnical and EcologicalCharacteristics of Green RoofsWorkshop 1Hamburg 14 May 2013Dr. Christoph Maria Ravesloot M.Sc.Eng.M.STS.Professor Sustainable Innovation Design and Construction ProcessesRotterdam University of Applied Science
  2. 2. ©2013 dr.drs.ir. Christoph Maria RaveslootExtensive Green Covered RoofsThe absence of standardized assessmentprocedures and methods of calculation forthe technical and eco- logical characteristicsof Green Roofs is hindering the developmentof the Green Roof market in the Netherlands
  3. 3. ©2013 dr.drs.ir. Christoph Maria RaveslootFaster more large areasof green roofsPrivat clientsPublic authorities• Verification and validation specifications• Measure and calculate• Specifications can not be compared• Business cases can not be compared• Public authorities can hardly estimate impact• Public authorities have difficulties developingeffective governance models and cost estimationsBEGROEIDEDAKENNA2010Teeuw|RaveslootDakbegroeiing in de stad levert een maatschappelijk voordeel intermen van leefmilieu en waterbuffering, mits toegepast op dejuiste plek en op grotere schaal.Dit potentieel kan alleen benut worden als de verschillende partijenzich goed organiseren in de samenwerking, en als de kosten enbaten zichtbaar gemaakt kunnen worden: voor de eigenaar, debeheerder en de gebruiker van het gebouw, als ook voor plannersen stedebouwkundigen.Begroeide daken na 2010 belicht deze grotere schaal en bena-dert de materie hiermee vanuit een nieuw perspectief. Teeuw enRavesloot publiceren al sinds 1991 op het onderwerp van begroeidedaken en geven met deze publicatie verder richting aan de praktijken toepasbaarheid van dakbegroeiing in Nederland.Begroeide Daken na 2010Afstemming van techniek, organisatie & maatschappelijk belangPeter G. Teeuw | Christoph Maria RaveslootBegroeide daken na 2010Afstemming van techniek, organisatie & maatschappelijk belangPeter G. Teeuw | Christoph Maria RaveslootBegroeide daken na 2010Afstemming van techniek, organisatie & maatschappelijk belangPeter G. Teeuw | Christoph Maria RaveslootTechne Press
  4. 4. ©2013 dr.drs.ir. Christoph Maria RaveslootResearch TeamClassification implementationtechnical specificationsDr. Christoph Maria Ravesloot, M.Sc. Eng. M.STS procesmanagerDr. Carleen Mesters, projectmanager casestudies, Wageningen ArnhemWim Verburg, M.Sc.Eng projectmanager casestudies RotterdamHEAT: Erik Huang, Pepijn Somers, Marc DelemarreMitchel Klaasman, Stephen Abraham Reynolds, Dyiako ShadmanfarWATER: Tine van Langelaar , Senny WagemakerThomas Mos, Bastiaan van der Horst, Sander Versluis, Jorte WeijCOST BENEFIT ANALYSIS: Yassin Boulghalegh, Tosca van ZijlCONSTRUCTION: Madina Karim, Geoffrey Quak, Raimon de Jong,WIND: Jason Koppelle
  5. 5. ©2013 dr.drs.ir. Christoph Maria RaveslootClassificationPrivate clients, businessdevelopers and public parties• Stimulation of innovation, aiming at increasing themarket share of green covered roofs and increasingcompetition by:• alignment of private goals and public goals• development of uniform classification of technicalspecifications• Tools that accelerate and enhance implementationof green covered roofs for private parties andauthorities
  6. 6. ©2013 dr.drs.ir. Christoph Maria RaveslootPLANNING 2012-2013Euro 750.000,0050 % private funding public funding14May2013
  7. 7. ©2013 dr.drs.ir. Christoph Maria Ravesloot14May2013case studiesAlexandrium 2013 RotterdamHouse of Sports 2013 UtrechtOffice building 2013 Arnhem and RotterdamSME SME SME SME SME SME SME SME SME SME
  8. 8. ©2013 dr.drs.ir. Christoph Maria RaveslootOVERLOOK AND ANALYSISWATER AND HEATHeatSenny WagemakerWaterMarc DelemarrePepijn SomersErik C. HuangTine van Langelaar
  9. 9. ©2013 dr.drs.ir. Christoph Maria RaveslootSYNTHESISWATER, HEAT, VALUE, WIND,CONSTRUCTION AND PVHeatJasonKoppelleWindThomas MosBastiaan van der HorstWaterSander VersluisJorte WeijTosca van ZijlYassin BoulghaleghConstructionMitchelKlaasmanMadina KarimGeoffrey QuakRaimon de JongValue PVDyiako ShadmanfarStephen Abraham-Reynolds
  10. 10. ©2013 dr.drs.ir. Christoph Maria RaveslootEVALUATIONWATER, HEAT, VALUE, WIND,CONSTRUCTION AND PVVerification, validationKnowledge transfer NENBusiness cases water and heat
  11. 11. ©2013 dr.drs.ir. Christoph Maria RaveslootWATER resultsYES WE CAN• Link water specifications of green covered roofs tospecific calculation models for capacity sewersystems and capacity water systems per city quarter• Tolerances in the specifications have to be narroweddown to get more reliable estimations• Reliable estimations are necessary for developmentof new business models to share cost and benefitson a larger scale than within circles of publicauthorities and within circles of private parties
  12. 12. WATER resultsModeling rainwater run offPeak run off green roof Peak run off black roof Rain©2013 dr.drs.ir. Christoph Maria Ravesloot• Influence of green covered roofs on peak run off was 13 %• Influence of paved private gardens on peak run off was 30 %Rain Evaporation black roof Evaporation green roofRainfall
  13. 13. ©2013 dr.drs.ir. Christoph Maria RaveslootHEAT resultsWE CAN NOT estimate InsulationWE CAN estimate Cooling• From literature research is concluded that nor inwinter nor in summer conditions any contribution tothe u-value of green roof construction can beexpected. There are some exceptions that are beingtested in case studies.• The shading and cooling from evaporation on greencovered roofs can contribute to decrease of coolingdemand under roofs. The calculation however is noteasily executed due to illogical input possibilities incalculating software
  14. 14. ©2013 dr.drs.ir. Christoph Maria RaveslootHEAT resultsLittle estimated extra insulationLeaf Area Index LAIshortwaveinfraredlongwaveinfraredconvectionheatexchangeheatlossthrougheva-poration
  15. 15. ©2013 dr.drs.ir. Christoph Maria RaveslootHEAT resultsLittle estimated extra insulation vegetationair between leafswind membranesubstratefilter membranedrain membraneroot secure membranesecurity membranewater safe membraneinsulationconstructionindoor spaceshort wave heat reflection / absorptionfrom vegetation and substrateheat flux from conductivity through layersheat storage in mass of materialsheat from persons and installationsheat from photosynthesis in the vegetationis not taken into accountlong wave heat exchange betweenlayers, vegetation and substrate, toatmosphereheat loss trough evaporation of waterin the substrate and throughvegetationlong wave heat exchange betweenlayers, vegetation and substrate, toatmosphere
  16. 16. ©2013 dr.drs.ir. Christoph Maria RaveslootCOOLING resultsSensitivity for cooling from shadingand for cooling from evaporation• LAI Leaf Area Index seems to be important• Moisture and water have significant influence• Plants can give considerable shading
  17. 17. ©2013 dr.drs.ir. Christoph Maria RaveslootPV resultsWE CAN estimate improved yieldWE CAN make a decision model• PV panels produce more kWh electricity if cooled bya green covered roof underneath. The yield willimprove between 4 % - 16 %, according to case-studies around the world.• A decision support model for designers will bemade, to maximize potential for cooling PV withgreen covered roofs.
  18. 18. ©2013 dr.drs.ir. Christoph Maria RaveslootCONSTRUCTION resultsWE CAN find potential capacityWE CAN make a decision model• STEEL roofs: big areas for greening like shoppingmalls, sport facility building, industrial buildings• CONCRETE roofs: big ares for greening likeresidential ares for housing corporations and likeoffice buildings• old norms for construction calculation might havesome residual capacity hidden in safety norms andinaccuracy of calculating formulas
  19. 19. ©2013 dr.drs.ir. Christoph Maria RaveslootWIND resultsHow about wind speedHow about counter weight and form• At edges on roofs high wind velocity occurs• Substrate (sand) can start eroding at low velocities• Vegetation can offer resistance to erosion• Vegetation and substrate offer weight• Vegetation offers stability from a flat plate of weight• Liquidation of pressure is known for tiles and gravel
  20. 20. ©2013 dr.drs.ir. Christoph Maria RaveslootVALUE resultsWE CAN calculate cost benefitsWE make new business models• Scale of buildings CBA• Scale of water management systems of city quarters• Scale out of water management systems, city wideor even on higher scales
  21. 21. ©2013 dr.drs.ir. Christoph Maria RaveslootVALUE resultsWE calculate social cost benefitsWE support governance models• deliverable calculation models• possible implementation in urban planning• combining technical and ecological characteristics withmunicipal support programs• framework of rain- water fees• framework of cooling capacity for commercial buildings
  22. 22. ©2013 dr.drs.ir. Christoph Maria RaveslootConclusionWe can see the huge amount ofknowledge all over the world• however, there is little integration of knowledge andlittle application in practice, yet• however, there are strong opinions hinderinginnovation and product development• however, there is still a lot of work to be done, notnecessarily Research, more Development (R&D)• uniform assessment methods on specification will helpif quick and dirty• norms can compensate with higher standards
  23. 23. ©2013 dr.drs.ir. Christoph Maria RaveslootLet’s carry onAll together nowFebruary 2013 Working conference Public-Private business models@ChristophMaria ChristophMaria@Ravesloot.nl