Jarek Kurnitski - Työpaja "Aidot hankkeet nZEB:iin"

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Esitetty RYM Oy:n, GBC Finlandin ja ympäristöministeriön Aidot hankkeet nZEBiin -työpajassa 22.8.2013.

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  • ” Double” boundary (delivered energy) removed, because obvious Only layout changes: Building body added: the box of technical systems shows that systems can be partly out of building (solar collectors, heat pump collectors/outdoor units etc.). Techical systems cover both HVAC and on site energy production – no separation
  • Jarek Kurnitski - Työpaja "Aidot hankkeet nZEB:iin"

    1. 1. Työpaja “Aidot hankkeet nZEB:iin” Jarek Kurnitski Full Professor, Tallinn University of Technology Adjunct Professor, Aalto University Vice-president REHVA jarek.kurnitski@ttu.ee www.nzeb.ee nZEB - FIN, 22.8.2013
    2. 2. Federation of European Heating, Ventilation and Air-conditioning Associations! REHVA nZEB technical definition – 2013 revision CLIMA 2013, 19.6.2013
    3. 3. © Sitra •  Kirja ei pelkästään uusista määräyksistä vaan myös hyvistä suunnittelu- käytännöistä •  n. 100 s. + liitteet •  Pääpaino asuinrakennuksissa •  Myynyt yli 1000 kpl 10.5.2012Jarek Kurnitski
    4. 4. nZEB kirja 2013 § Matalaenergia- ja lähes nollaenergiarakennukset – toimistorakennusten perusratkaisut luonnossuunnittelu- vaiheessa § Suunnitteluprosessin ja teknisten ratkaisujen erot verrattuna tavanomaiseen suunnittelukäytäntöön § Kohderyhmä: tilaajat, rakennuttajat, arkkitehdit, rakenne- ja talotekniikka- suunnittelijat, urakoitsijat, opiskelijat jne.
    5. 5. Federation of European Heating, Ventilation and Air-conditioning Associations! nZEB def is based on detailed system boundaries •  System  boundaries  (SB)  for  energy  need,  energy  use  and  delivered  and  exported  energy   calcula<on.  The  last  one  may  be  interpreted  as  the  building  site  boundary.   •  Demand  reduc<on  measures  can  be  dis<nguished  from  RE  solu<ons  in  the  energy  use  SB,  not   in  the  delivered/exported  energy  SB    
    6. 6. Federation of European Heating, Ventilation and Air-conditioning Associations! System boundary for nearby RE •  System boundary for nearby RE plants contractually linked to the building (a share of the capacity/production can be linked to the building) •  National legislation needed to allocate new RE capacity to the building/ developement with a long term contract
    7. 7. Federation of European Heating, Ventilation and Air-conditioning Associations! nZEB definitions’ situation •  European definitions following EPBD recast: –  REHVA 2013 – REHVA has revised its nZEB technical definition and set of system boundaries for primary energy indicator and RER calculation in cooperation with CEN, Report No 4, www.rehva.eu –  CEN is working with overarching EPBD standard prEN 15603:2013, which will include calculation bases for primary energy and RER •  National definitions – Concerted Action CA EPBD (March 2013 data) has collected detailed information from 19 countries: –  of which six have their national application of the nZEB definition included in a legal document (Cyprus, Denmark, Estonia, Lithuania, Slovak Republic and France) –  six other countries have their application developed, but not yet fixed in a legal document –  and the remaining seven countries have documented their current plans
    8. 8. Federation of European Heating, Ventilation and Air-conditioning Associations! Towards nearly zero energy buildings Denmark Characteris+c   values       Energy   frame   2010   Energy   frame   2015   Energy   frame   2020   nZEB   Maximum  of   primary  energy  to   Residen<al  buildings  (houses,   hotels,  etc.)   52.5  +   1650/A   in  kWh/ m²a   30  +  1000/ A   in  kWh/ m²a   20  kWh/ m²a   Non-­‐residen<al  buildings   (offices,  schools,  ins<tu<ons   and  other  buildings)   71.3  +   1650/A   in  kWh/ m²a   41  +  1000/ A   in  kWh/ m²a   25  kWh/ m²a   Primary  energy     factors   Electricity   2.5   2.5   1.8   District  hea<ng   1.0   0.8   0.6  
    9. 9. Federation of European Heating, Ventilation and Air-conditioning Associations! Towards nearly zero energy buildings Estonia Primary energy requirements for 9 building types (apply from Jan 9, 2013) nZEB Low  energy Min.req.  new Min.req.  maj.ren. A B C  (cost  opt.) D  (cost  opt.) kWh/(m2  a) kWh/(m2  a) kWh/(m2  a) kWh/(m2  a) Detached  houses 50 120 160 210 Apartment  buildings 100 120 150 180 Office  buildings 100 130 160 210 •  nZEB and low energy requirements officially given (not yet mandatory) •  Primary energy conversion factors: –  Electricity 2.0 –  Fossil fuels 1.0 –  District heat 0.9 –  Renewable fuels 0.75
    10. 10. Federation of European Heating, Ventilation and Air-conditioning Associations! nZEB case studies
    11. 11. Federation of European Heating, Ventilation and Air-conditioning Associations! Common nZEB components in: Central Europe vs. North Europe •  Large windows for max daylight to save lighting electricity •  Moderate insulation (Uwindow=1.1 , Uwall=0.30) •  More cooling need than heating need •  External solar shading •  “Glass” buildings with external shading possible •  Free cooling combined with compressor cooling or solar cooling •  Water based distribution system for cooling (or VRV) •  Heat recovery ventilation •  Demand controlled ventilation and lighting •  PV panels •  Small windows for lowest acceptable average daylight factor •  Highly insulated envelope (Uwindow =0.6… 0.8, Uwall=0,15) •  Slightly less cooling but a lot of heating •  External shading for low solar angle •  Double skin façade to be used for “glass” buildings •  100% free cooling possible with borehole water •  Water based distribution systems for heating and cooling (or VRV) •  Heat recovery ventilation •  Demand controlled ventilation and lighting •  PV panels
    12. 12. Joint nZEB research group of TUT and Aalto
    13. 13. Some outcomes of nZEB group International • Preparation of European nZEB technical definition for uniformed national implementation of EPBD – REHVA nZEB definition 2013 (Chairing the REHVA nZEB task force and cooperation with CEN) • Comparative analyses of Estonian and Nordic building codes regarding energy performance minimum requirements Estonia • Contribution to preparation of the Estonian regulation on minimum energy performance requirements and calculation methodology (revision of the minimum requirements, governmental act VV No 68:2012 and a new act of calculation methodology MKM No 63:2012) • Guide for low energy and nearly zero energy buildings – technical solutions for scoping and conceptual design stage (about 100 pages for construction clients, architects, contractors and other decision makers, printed book March 2013).
    14. 14. How to compare energy reqs? Apartment and office buildings (1/2013 data) § Maximum allowed delivered energy for heating, hot water and ventilation systems in apartment buildings and for office buildings (lighting included) with district heating 0 20 40 60 80 100 120 140 Denmark Norway Sweden Estonia Finland Maxdeliveredenergy,kWh/(m2a) Apartment building Office building
    15. 15. Some outcomes of nZEB group Research • Low temperature radiator heating systems – detailed dynamic modeling for quantification and control of distribution and emission losses in low energy buildings • Fenestration design principles in a cold climate for office buildings with the focus on daylight, heating and cooling energy and lighting electricity • Development and validation of simplified energy performance compliance assessment method based on specific heat loss correlation and used in Estonian regulation • Quantification of environmental and economic impacts for main categories of building labeling schemes in Estonian context
    16. 16. Plans for 2013-2014 § Expand to Aalto university – TUT-Aalto joint nZEB, dual professor and dual Phd-students § Field measurements in TUT new nZEB technological test facility – low E heating solutions, GSHP collectors § Rakvere Smart Building CC nZEB case study § Continue with ongoing research topics: § Facades (solar shading/control) § Radiator heating with heat pump § Building labeling/performance § New topics: § Building envelope integrated collectors § Boreholes/GSHP – energy pile applications § nZEB concepts/solutions for res and non-res § nZEB pilot buildings benchmarking (REHVA) § Daylight design methods § Energy and IEQ commissioning § Durability of facades § Air tightness/radon

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