European airtightness association committee

Internet Meeting

07/03/13

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)

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

ActionsNr. Description By When 1. Airtightness requirements summary and questionnaire analysis – Modify

the documents with feedback from meeting and Czech republic and Sweden

Rémi/Valérie March 15

2. Airtightness requirements summary and questionnaire analysis – Send documents around for final approval

Rémi March 15

3. Airtightness requirements summary and questionnaire analysis – Make revised version public when approved

Rémi March 31

4. Check interest of UK and DK for presentation in webinar with description of competent testers schemes on June 25, 10:00-12:00

Rémi, Rob, Walter

March 15

5. Preliminary programme of webinar if applicable Rémi April 31 6. Walter and Rob to confirm if they will attend the Hannover meeting Walter, Rob March 15 7. Next meetings:

- Friday 3 May 2013, 10:00-12:00 (WebEx, Brussels time) - Thursday 6 June 2013, 09:00-15:30 (physical meeting before

BUILDAIR conference)

Previous action listNr. Description By When 1. Airtightness requirements summary – Include information from Sweden Eva Jan. 31 2. Airtightness requirements summary – Modify the document with

feedback from Czech republic and Sweden Rémi Feb. 15

3. Airtightness requirements summary – Make revised version public Rémi Feb. 15 4. Review of standards – Correct typo and make revised version public Rémi Feb. 15 5. Give explanation why uncertainty on reference value has no impact on

energy use calculation if same reference value is used for both. Rémi Feb. 15

6. Contact list - Send list of contacts of airtightness associations – Send update as needed to Rémi

All Jan. 31

7. Give feedback on questionnaire for tester schemes All Jan 12 8. Revise questionnaire for tester schemes Rémi Jan 18 9. Fill in new questionnaire All Jan 31 10. Next meetings:

- Wednesday 7 March 2013, 10:00-12:00 (WebEx, Brussels time) - Thursday 6 June 2013, exact time to be give (physical meeting

before BUILDAIR conference)

Analysis of questionnaires on competent tester schemes

• See presentation of V. Leprince

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.

Events• Quality of ventilation systems in Brussels

– 18-19 March 2013, http://tightvent.eu/events/qvs-workshop-2013, attractive programme

• 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

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

PublicationsAvailable at:http://www.aivc.org/frameset/frameset.html?../publications/publications.html~mainFrame

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

AOB

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

Annexes

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

DDVnE bldinfinf 34.01000

24

bldVVnn 5050

inf 201

20

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.

DDVVVE bldbld

50

inf 20134.0

100024