NBC boil-off calorimeter for measuring thermal conductivity of insulating materialsModern temperature, pressure and flow sensors along with a high speed digital control system have been incorporated into an existing thermal conductivity apparatus (ASTM C745). The system has also been modified to include the use of liquid helium as the refrigerant, if desired. The apparatus can be used to study thermal conductivity in the temperature range from 4 K to room temperature. Preliminary results on insulating materials indicate that the system update has significantly improved the precision and operational characteristics of the apparatus. Basic principles of operation, sources of system error and the reduction of system error by application of digital control and modern sensors are discussed. Preliminary data are presented.
Document ID
19880066078
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dube, W. P. (National Bureau of Standards Boulder, CO, United States)
Sparks, L. L. (National Bureau of Standards Boulder, CO, United States)
Slifka, A. J. (NBS, Chemical Engineering Science Div., Boulder CO, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Advances in cryogenic engineering (Materials). Volume 34