1. European airtightness association committee Internet Meeting 07/03/13

2. Participants Czech Republic: Jiri Novak (Asociace Blower Door CZ” (A.BD.CZ)) France: Cédric d’Haene (Syneole) Germany: Oliver Solcher (FliB) Sweden: Eva Sikander (Informal network in Sweden) UK: David Unwin, Tom Jones (ATTMA) TightVent members: Stefanie Rolfsmeier (BlowerDoor GmbH) TightVent Operating Agent: Rémi Carrié Guest: Valérie Leprince Apologies: – Denmark: Walter Sebastian (Klimaskaerm) – Apologies – Belgium: Xavier Loncour, Clarisse Mees - Apologies) (Observers) – UK: Rob Coxon – Apologies – TightVent Operating Agent: Maria Kapsalaki – Apologies, Peter Wouters No answer ? – Italy: Guenther Gantioler (ATTA)

3. Agenda Review of previous action list Analysis of questionnaires on competent tester schemes Information on events (conferences, workshops and webinars) and publications Hannover meeting AOB Next meetings

4. Actions

5. Previous action list

6. Analysis of questionnaires on competent tester schemes See presentation of V. Leprince

7. Information within committee Latest documents available on private area of TightVent website – http://tightvent.eu/partners/airtightness-testers- associations – Password is TVAAC2012, please do not disclose it.

8. Events Quality of ventilation systems in Brussels – 18-19 March 2013, http://tightvent.eu/events/qvs- workshop-2013, attractive programmehttp://tightvent.eu/events/qvs- workshop-2013 Airtightness workshop in Washington DC – 18-19 April 2013, attractive programme BUILDAIR symposium in Hannover – 7-8 June 2013 AIVC-TightVent 2013 conference in Athens – 25-26 September 2013, call open: http://www.aivc2013conference.org http://www.aivc2013conference.org

9. Events Webinar with presentation of competent tester schemes ? – Interest from DE, CZ, FR – Changes in process in the UK so probably not appropriate – DK ? – Tentative date = June 25, 10:00-12:00

10. Publications Available at: http://www.aivc.org/frameset/frameset.html?../publications/publications.html~mainFrame

11. Hannover meeting Proposal is to have a physical meeting of the committee from 09:00 until 15:30 on June 6, just before the BUILDAIR symposium Who will attend? – Yes Oliver, Jiri – Not sure Eva – Maybe Rob, Stefanie – No Cédric (probably) – To check : DK ? Walter

12. AOB

13. Next meetings Internet meeting – Friday 3 May 2013, 10:00-12:00 (WebEx) Physical meeting – Thursday 6 June 2013 in Hannover, 09:00-15:30

14. Annexes

15. Discussion on reference value used for airtightness indicator The uncertainty on the reference value has a direct impact on the uncertainty on the airtightness indicator – 10% error on volume implies 10% error on n50 value – This may be important for compliance to a given limit value of the airtightness indicator On the other hand, this uncertainty can be eliminated in the energy calculation since the energy calculation uses the total leakage flowrate For example, assume energy use is calculated from the calculated infiltration rate and degree-days where Einf is expressed in kWh, Vbld is the building’s volume, and DD is the number of degree-days in Kelvin days And assume ninf can be estimated with

16. Discussion on reference value used for airtightness indicator Equation becomes And therefore the building volume has no influence on the calculation of the energy use as long as you use the same value for calculating the n50 as the one you use in the EP calculation. The same conclusion can be drawn if the indicator is normalized with the cold area. In sum, – The uncertainty on the reference value to normalize the airtightness indicator affects directly the uncertainty on the airtightness indicator – But, as long as you use the same reference value to normalize the airtightness as the one which is used in the EP calculation, there should be no impact on the energy calculation.