ASTM/DOE Hot Box round robin

Document Type

Conference Proceeding

Publication Date

1-1-1991

Abstract

This paper presents the results of inviting the operators of all quarded and calibrated hot boxes in North America to participate in a round robin, an interlaboratory test program according to ASTM E 691, ″Conducting an Interlaboratory Test Program to Determine the Precision of a Test Method', to establish the precision and bias of the corresponding ASTM standard test methods: ASTM C 236, 'Steady-State Thermal Performance of Building Assemblies by Means of a Guarded Hot Box', and C 976, 'Thermal Performance of Building Assemblies by Means of a Calibrated Hot Box'. The data and data analysis are reported from twenty-one laboratories that completed a series of tests on 4-inch thick specimens of cellular polystyrene thermal insulation. The data analysis resulted in two recommended statements of precision and bias. Ninety-five per cent of the time measurements from two different laboratories on the same specimen would differ by up to ±7.8% at a mean temperature of 75 F for the guarded hot box, and by up to ±5.6% for the calibrated hot box. Based on guarded hot plate data for the specimen material, the reference value is 15.9 hr-F-ft sq/Btu. The mean of the thermal resistance reported for guarded hot boxes was 15.77 hr-F-ft sq/Btu, which differs by -1.2% from the reference value. The mean of the thermal resistance reported for calibrated hot boxes was 16.32 hr-F-ft sq/Btu, which differs by +2.6% from the reference value.

Identifier

0025842018 (Scopus)

ISBN

[0803114206, 9780803114203]

Publication Title

ASTM Special Technical Publication

External Full Text Location

https://doi.org/10.1520/stp16369s

ISSN

00660558

First Page

558

Last Page

571

Issue

1116

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