- Author
-
Graves, R. S.
|
McElroy, D. L.
|
Miller, R. G.
|
Yarbrough, D. W.
|
Zarr, R. R.
- Title
- Interlaboratory Comparison of Four Heat Flow Meter Apparatuses on Planed Polyisocyanurate Boards Foamed With CFC-11.
- Coporate
- Oak Ridge National Lab., TN
Jim Walter Research Corp., St. Petersburg, FL
Tennessee Technological Univ., Cookeville, TN
National Institute of Standards and Technology, Gaithersburg, MD
- Sponsor
- Department of Energy, Washington, DC
- Report
-
ORNL/TM-11720,
June 1991,
36 p.
- Contract
- DOE-CONTRACT-DE-AC05-84OR21400
- Keywords
-
polyisocyanurate foam
|
measuring instruments
|
heat transmission
|
tests
|
thermal conductivity
- Abstract
- This report describes an interlaboratory comparison of apparent thermal conductivity (k) results on planned polyisocyanurate (PIR) boards foamed with chlorofluorcarbon 11 (CFC-11). Sequential tests were conducted at 75 deg F (24 deg C) at four facilities on two rigid (PIR) boards, individually and as a pair, using four comparative heat flow meter apparatuses that meet American Society for Testing and Materials (ASTM) C 518. The specimens were shipped from lab to lab, and the testing sequence (Lab 1, 2, 3, 4, and 1) yielded 15 k-values that have a two standard devition [symbol] value of 2.2% when describes by: [equation] where t is the elapsed time in days after planing of the boards. The [symbol] value for five tests on Board 1 was 2.1% and the [symbol] value for five tests on Boards 1 + 2 was 2.2%; but the [symbol] value for five tests on Board 2 was 2.8%. This may be associated with a larger variation in measured specimen thickness (4.1%) for Board 2 than for Board 1 (1.7%) and Boards 1 + 2 (1.6%). The 15 thermal conductance (C) values have a [symbol] value of 3.2% when described by: [equation]. Thus, the [symbol] (k-values) of the interlaboratory comparison is not reduced by comparing C values.