DOC

Window U-value testing at the National Physical Laboratory (NPL)

By Ronald Phillips,2014-06-19 17:34
16 views 0
Window U-value testing at the National Physical Laboratory (NPL)

     Page 1 of 4

    Window and Door U-value testing

    at the National Physical Laboratory (NPL)

Apparatus used NPL Wall Guarded Hot Box

     NPL Rotatable Hot Box

Window & Door measurement standard BS EN ISO 12567-1:2000

    Cost of standard window measurement ?1900 + VAT

    Cost of standard door measurement ?2000 + VAT

Window size used for testing

    In principle any size up to 1800 mm x 1800 mm could be measured but in practice one of the two sizes shown below should be selected:

Size 1 (1198 ; 2 mm high) x (1198 ; 2 mm wide) x max thickness of 150 mm

    Size 2 (1478 ; 2 mm high) x (1228 ; 2 mm wide) x max thickness of 150 mm

     This is the FENSA standard size.

Window designs used for testing

    In principle any design can be measured. The design should be chosen to be representative of the window type of interest. To show compliance with Building Regulations and for comparison purposes, however, the following designs have been selected by the Glass and Glazing Federation in their document: “Section 2 – Window and Door System U-values:

    Provision of certified U-values” and these designs should normally be selected.

     Fig. A Fig. B

     1.48 m

     1.23 m 1.23 m

    Figure A: Reference window design, Approved Document L1

    Figure B. Reference window design, Approved Document L2.

    Alternative design

     Page 2 of 4

    Where the arrangement in Figure A, cannot be accommodated by the system parameters, a central transom may replace the mullion. There would then be a top hung casement over a fixed light.

ADDITIONAL DESIGN DETAILS

Trickle ventilators

    There are no rules about whether you test with or without trickle ventilators its up to you.

    Sills

    Normally we test windows without the sill being fitted. But again it is your choice as long as the sill is less than 150 mm deep

INFORMATION THAT IS REQUIRED IN THE TEST REPORT

There are two question sheets at the end of this document one for a door and one for a

    window. You should fill the appropriate one out for each system we test. The measurement standard BS EN ISO 12567-1:2000 requires that we include a cross section drawing of the most important frame profiles giving the main dimensions. We there need you to supply such a drawing (A4 size) for each profile type. That drawing should be an original (not faxed) because it will be included in the Report.

TEST DETAILS

    The window is mounted in a holder panel of expanded polystyrene using “duct tape” to keep it in place. This ensures we do not affect the thermal performance by the fixings. This is shown in the sketch below.

     Expanded polystyrene holder panel 150 mm thick

DETAILS FOR DOORS

     Page 3 of 4

    INFORMATION NEEDED FOR THE NPL TEST REPORT - Please fill in a

    separate sheet for each door tested - we must have this information before the test is

    started.

    Person's name to be put in ReportCompany name to be put in ReportAddress to be put in report

    Frame details

    Your unique identification mark Door's commercial name

    Door and Door frame material

    Technical description of frame, panels and door design

    Details of reinforcement (if appropriate)Frames

    Mullions

    Transoms

    Outer frame thickness (m)

    Please send cross section drawings showing important Drawings

    dimensions. - On A4 paper suitable for inclusion in the Test

    Report

    Glazing details

    Manufacturer's name

    Type (eg double glazed)

    Glass thickness outer pane

    Glass thickness inner pane

    Coatings {Outside surface = 1}

    Cavity size

    Gas fill

    Spacer bar type

    Please indicate if you want the door back after the test - if not we Disposal after test

    will dispose of it after 3 months.

     Page 4 of 4

    DETAILS FOR WINDOWS

INFORMATION NEEDED FOR THE NPL TEST REPORT - Please fill in a

    separate sheet for each window tested - we must have this information before the test

    is started.

    Person's name to be put in ReportCompany name to be put in ReportAddress to be put in report

    Frame details

    Your unique identification mark Frames commercial name

    Frame material

    Technical description of frame andwindow design

    Details of reinforcement (if appropriate)

    Frames

    Mullions

    Transoms

    Sashes

    Outer frame thickness (m)

    Please send cross section drawings showing important Drawings

    dimensions. - On A4 paper suitable for inclusion in the Test

    Report

    Glazing details

    Manufacturer's name

    Type (eg double glazed)

    Glass thickness outer pane

    Glass thickness inner pane

    Coatings {Outside surface = 1}Cavity size

    Gas fill

    Spacer bar type

    Please indicate if you want the window back after the test - if not Disposal after test

    we will dispose of it after 3 months.

     thRay Williams 12 March 2002

Report this document

For any questions or suggestions please email
cust-service@docsford.com