Laboratories that submit data to the Complex Glazing Database (CGDB) have to participate in an inter-laboratory comparison (ILC). This a procedure that allow both contributors and database maintainers to confirm that the measurement capabilities of the laboratories are of high quality.

This is the first time the procedures in AERC 1.1 is used in an ILC, so the result is expected to be used as a measure of the accuracy of the methods of AERC 1.1.


The goal of the ILC is to make sure the submitting laboratories populate the CGDB with accurate data as well as learn about the accuracy of the methods written in AERC 1.1. In past ILCs, LBNL has been working with outliers trying to make sure they measure accurately and that is still our mission.

Questions and answers

11/3/2017 - Are the instructions written yet? Yes.

11/13/2017- The instructions specify that the labels are on the back of the samples, but the label reads front, please clarify. The label is correct, the instructions are updated in v1.1.

11/13/2017- Can you specify the blind manufacturer for sample 5? Unfortunately no, I saved those from being thrown away, and there were no identifying marks left.

11/13/2017- AERC 1.1 specifies a requirement of the sphere aperture that implies that only circular ports are allowed, is that intended? No, rectangular ports of similar size were not intended to be disqualified. The open part of the question is what the minimum side of the port has to be, this is crucial as it influences the maximum possible beam size. And as the beam size in turn influences how well inhomogeneous samples are characterized there should be a minimum specified. Hopefully some rectangular ports measurements will be submitted and provide information about this.

6/1/2018 - Are the values in the emissometer workbook seems very wrong? Mostly yes, they were filled out to verify that the connections to equations were working.

6/13/2018 - Second emissivity datasheet uploaded, this is required to complete for passing the emissivity portion of the ILC.