EN ISO 10077-2 Annex I.1 validation – CEN Simplified and NFRC frame cavities

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Goce Talev

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Sep 29, 2026, 12:28:52 PMSep 29

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I am using THERM 7.8.

I am using THERM 7.8 and validating EN ISO 10077-2 Annex I.

For case I.1 (reference L²D = 0.550 W/(m·K)), I obtain:

EN ISO: 0.53784 (−2.21%) – PASS CEN Simplified: 0.53064 (−3.52%) – FAIL
NFRC: 0.52944 (−3.74%) – FAIL

The other Annex I cases I tested are within ±3%.

Are CEN Simplified and NFRC expected to satisfy the Annex I ±3% criterion, or is Annex I validation intended specifically for the EN ISO single equivalent thermal conductivity method? I can provide the THERM models if helpful.