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ASTM Selected Technical Papers
Thermal Transmission Measurements of Insulation
By
RP Tye
RP Tye
1
Senior scientist
,
Dynatech R/D Co.
,
Cambridge, Mass. 02139
;
symposium chairman and editor
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ISBN-10:
0-8031-0589-4
ISBN:
978-0-8031-0589-8
No. of Pages:
461
Publisher:
ASTM International
Publication date:
1978

Many applications require knowledge of thermal properties, over a wide range of temperature, to within 5 percent. The speedy and economical acquisition of the data is often a prime concern. We are investigating the potential of the very simplest system (an unguarded plate system), used in a drift mode rather than in a steady-state mode, to fulfill this need.

When heat flows across a specimen whose mean temperature is drifting slowly and linearly with time, a term of the form CF(dT/dt) must be added to the steadystate equation. Data are taken over a given temperature range with the temperature both increasing and decreasing; the value of CF is then adjusted until the two sets of data produce the same value of conductivity. Since CF is a function of the density of the specimen and its specific heat at constant pressure, an approximate value of the thermal diffusivity is obtained as a by-product in this drift mode of operation.

The successful application of the technique is illustrated by both drift technique and steady-state measurements on microconcrete over the temperature range -20 to +60°C. Corrections for heat losses and nonlinear heat flow have been appraised by finite-element analysis and by comparisons with data from adiabatic linear heat flow systems. Our objective is to develop the apparatus for use up to 500°C.

1.
Hust
,
J. G.
,
Powell
,
R. L.
, and
Weitzel
,
D. H.
,
Journal of Research of the National Bureau of Standards
 0160-1741, Vol.
72-A
,
1970
, pp. 673–690.
2.
Shirtliffe
,
C. J.
,
Stephenson
,
D. G.
, and
Brown
,
W. C.
,
National Research Council of Canada
, Research Paper
638
,
1974
.
3.
Hildebrand
,
F. B.
,
Advanced Calculus for Applications
,
Prentice Hall
,
1962
.
4.
Tye
,
R. P.
, Ed.,
Thermal Conductivity
,
Academic Press
,
New York
,
1969
.
5.
Neville
,
A. M.
,
Properties of Concrete
,
Wiley
,
New York
,
1973
.
6.
Loomer
,
J. E.
and
Ashworth
,
T.
,
Proceedings
South Dakota Academy of Science, Vol.
51
,
1972
, pp. 238–243.
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