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Progess needed on ventilation and airtightness in Romania by Horia Petran, INCD URBAN-INCERC, Romania
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Progess needed on ventilation and airtightness in Romania by Horia Petran, INCD URBAN-INCERC, Romania

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Webinar “Airtightness and ventilation perspectives in Romania“ June 21, 15:00-17:00 (Bucharest time) …

Webinar “Airtightness and ventilation perspectives in Romania“ June 21, 15:00-17:00 (Bucharest time)


AGENDA

15:00 Introduction of the webinar and objectives
Remi Carrie, INIVE, Belgium

15:10 Global context of airtightness challenges and the TightVent Europe initiative
Peter Wouters, INIVE, Belgium

15:25 Potential impacts of envelope and ductwork leakage
Remi Carrie, INIVE, Belgium

15:40 Exchanges with participants

15:55 Airtightness and ventilation in the Romanian regulation
Ioan Dobosi, REHVA, Romania

16:15 Progess needed on ventilation and airtightness in Romania
Horia Petran, INCD URBAN-INCERC, Romania

16:35 Questions & Answers

16:40 Open discussion
Chairperson: Remi Carrie, INIVE, Belgium

16:55 Conclusion – Polling

17:00 End of the webinar


For more info visit http://www.tightvent.eu

Published in: Technology, Business

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  • 1. Progress needed on ventilation and air tightness in Romania Horia Petran INCD URBAN INCERC URBAN-INCERC (INCERC Bucharest) hp@incerc2004.ro TightVent Webinar Airtightness and ventilation perspectives in Romania 21 June 2011 Contents Airtightness of current building stock in Romania  Potential / impact of ventilation  Envelope permeability  T ti methods and current investigations Testing th d d ti ti ti Ventilation issues in the Thermal Rehabilitation Program  Context and instruments / schemes  Key actors involved  Impact on indoor air quality Ventilation of low energy buildings / nZEB  Requirements and weight of ventilation in energy balance q g gy  Towards efficient solutions Indoor air quality in educational buildings  Requirements  Current situation  Challenges Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 1
  • 2. Air tightness of current building stock in Romania Potential – RO building stock (BS): Blocks of Flats 71,4%  Residential: > 4.8 Mil. buildings > 8 Mil. dwellings Semi- detached 5,8% (3.1 Mil. dwel. in ~84.000 blocks = 70% of BS) > 450 Mil. m² Individual 22,8% > 22 Mil. people Semi-detached Blocks of Flats  Tertiary: > 230 Th. Buildings 3,1% 2,1% > 70 Mil. m²  Energy use (heating): 100-300 kWh/m²y Individual Energy strategy – Bucharest 2008: 94,8%  ~ 800.000 dwellings + tertiary D  Energy use (heating): ~ 7,9 TWh/y  Potential for ventilation: ~ 2,4 TWh/y A B C D E F G 70 173 245 343 500 117 Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 Air tightness of current building stock in Romania Most RO buildings do not have mechanical ventilation (except limited kitchen or bath exhaust systems)  rely on:  infiltration (i.e., leakage through the building envelope) and  natural ventilation (i.e., window opening) to maintain acceptable indoor air quality Envelope permeability  Air permeability of building components and building elements • Index / joint length (m³/h/m) @ 50Pa  Air permeability at building level • Index / envelope area (m³/h/m²) @ 50Pa Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 2
  • 3. Air tightness of current building stock in Romania 1,5 Air Leakage Index (m³/h/m) @ 50Pa Testing methods and investigations: 1,0  Fan pressurization method  blower door 0,5 m³/h.m  Thermal imaging (thermography)  air leaks 0,5  Ventilation system functionality surveys 0,0  Indoor climate surveys 1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 76 14 ENVELOPE - na @ 50Pa Windows testing (INCERC): 12 12,44  79 components: 0.1 - 1.35 m³/h/m @ 50Pa 10 8 6,80 6,48 6,35 6,21 6,40 (average 0,51 m³/h/m @ 50Pa) 6 5,10 – current market 4 2 Building testing (INCERC): u d g test g ( C C) 0 House 1 Apt. 2 Apt. 3 Apt. 4 Apt. 5-a Apt. 5-b Apt. 6  1 individual house + 5 apartments 30 WINDOW 27,66  na @ 50Pa = 5.1 … 6.8; 12,4 h-1 25 Permeability index @ 50Pa 21,90 20  Envelope: 3.2 … 6.8 m³/h/m² @ 50Pa 12,13 15  Windows: 9.0 … 27 m³/h/m @ 50Pa 10 9,97 9,03 Relevance of values @ 50Pa? 5 0 House 1 Apt. 2 Apt. 3 Apt. 4 Apt. 5-a Apt. 5-b Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 Ventilation issues in the Thermal Rehabilitation Program Context and instruments / schemes  Blocks-of-Flats built in 1950-1990  Investment: 80% ensured by State and Local Budget + 20% ensured by the owner  Financed solutions: thermal insulation building components, windows replacement and other envelope works  NO money for ventilation system Key actors involved  Finance source (GOV, Local auth.)  Designers, experts  Beneficiary (Owner Associations) Impact on indoor air quality  Interventions on existing natural ventilation  Occupants behaviour  use of open-flame source, not sufficient window opening  risk of Sick Building Syndrome Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 3
  • 4. Ventilation of low energy buildings / nZEB Ventilation requirements  Very airtight envelope  Controlled ventilation is essential in highly airtight buildings  Air tightness of ductwork  Heat recovery (>80%) Weight of ventilation in energy use  Energy use for ventilation > Exergy loss by transmission (high envelope thermal performance)  from <30% to >50% Towards efficient solutions  Intelligent (adaptive) envelopes  Ventilated envelopes (int. / ext.)  Ventilation coupled with active/passive solar design  Night ventilation Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 Ventilation of low energy buildings / nZEB Efficient solutions (ex.) HR  Ventilated envelope system: wall with parietal-dynamic effect on the exhausted air from occupied spaces Variable envelope thermal resistance  Ventilated solar space (preheating ventilation air)  Active or passive ventilated façades  use of PV panels as active covering and preheating the fresh air while cooling down PV elements  Night ventilation in summer  cooling passive or active elements: building mass, TABS, PCM) Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 4
  • 5. Indoor air quality in educational buildings Requirements  Minimum air flow per person  Ventilation needs are much higher  people concentrated in closed spaces over extended periods of time  Need for intelligent ventilation system  Need for low ventilation for long breaks Current situation  Direct and natural ventilation is not AH = 54 m² effective for adequate indoor air quality VH = 162 m³  Major program for schools NP = 20  na = 3,9 h-1 rehabilitation  increased air tightness, but no controlled ventilation EPB evaluation – EP Certification  Wrong ventilation strategy is used often in EPC elaboration …  Right na, but penalties for ‘no system’ Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 Indoor air quality in educational buildings Challenges  Detail and clarify legislation on ventilation & EP certification  Training of the experts involved (architects, designers, energy auditors, inspectors) + building workforce  Raising awareness – GOV, Inspectorates, Teachers  Education ! Adapted / tailored technological solutions:  Monitoring indoor air quality in classrooms  Ensuring comfort: thermal + physiological  Prediction – correction  control strategy and system Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 5
  • 6. CONCLUSIONS Significant potential for ventilation Not one identified problem with one potential solution  Envelope permeability  low EPB  Envelope air tightness + no ventilation + behaviour  SBS  Low EB  correct ventilation + adaptive solutions (ENV + systems)  Indoor air quality  to be high priority within rehabilitation schemes Strategy of “Build it tight. Ventilate it right” Indoor air quality  ventilation strategies + systems Importance of right ventilation in schools: EEnsuring ventilation when i needed i til ti h is d d  Low exergy systems  high EPB  Efficiency of ventilation and indoor comfort (incl. thermal, acoustical)  mixed radiative & convective systems nZEB  heat recovery, pressure balancing, passive strategies, night ventilation, PCMs, renewable sources etc. Horia Petran – Progress needed on ventilation and air tightness in Romania – WEBINAR 21 June 2011 Progress needed on ventilation and air tightness in Romania Thank you ! Acknowledgements: The information presented use the results obtained within the research team on Energy and Environmental Performances of Sustainable Buildings - coordinated by Prof. Dan Constantinescu 6