|LC Classifications||TA418.54 .A4|
|The Physical Object|
|Number of Pages||118|
|LC Control Number||67020499|
This material must be precisely characterized at both elevated and cryogenic temperatures. The present paper discusses the apparatus set up to establish the thermal conductivity of candidate materials at low temperatures. The apparatus enables cryogenic heat flow measurements in the presence of a by: 1. American Society for Testing and Materials. Committee C on Thermal Insulating Materials. Thermal conductivity measurements of insulating materials at cryogenic temperatures. Philadelphia, American Society for Testing and Materials  (OCoLC) Online version: American Society for Testing and Materials. Waynert J. () Measurement of Thermal Conductivity of Insulating Cryogenic Structural Materials. In: Reed R.P., Clark A.F. (eds) Advances in Cryogenic Engineering Materials. Advances in Cryogenic Engineering Materials, vol Cited by: 1. American Society for Testing and Materials. Committee C on Thermal Insulating Materials. Thermal conductivity measurements of insulating materials at cryogenic temperatures. Philadelphia, American Society for Testing and Materials  (DLC) (OCoLC) Material Type: Document, Internet resource: Document Type.
1. Thermal Conductivity Material thermal conductivity milliWatt per meter-Kelvin [mW/m-K] R-value per inch [hr-ft2-degF/Btu-in] 1 mW/m-K = R Apparent thermal conductivity k-value Real systems with large temperature differences Overall k-value for actual field installation k oafi Often one order of magnitude (or more!) higher than. KEY WORDS: thermal insulation materials, thermal conductivity, measurements, operating temperature. *Author to whom correspondence should be addressed. E-mail: [email protected] Journal of BUILDING PHYSICS, Vol. 29, No. 2—October /05/02 –14 $/0 DOI: / PROPERTIES OF SELECTED MATERIALS AT CRYOGENIC TEMPERATURES. Foster, W. G., Naes, L. G., and Barnes, C.B., Thermal Conductivity Measurements of Fiberglass/Epoxy Structural Tubes from 4 K to K, AlAAS Paper 75 , American Institute of Aeronautics and Astronautics (A1AA), 10th Thermophysics Conference, Denver, CO, [Kevlar]. Materials, which have a low thermal conductivity, are those, which have a high proportion of small voids containing air or gas. These voids are not big enough to transmit heat by convection or radiation, and therefore reduce the flow of heat. Thermal insulation materials fall into the latter category. Thermal insulation materials may be natural.
Thermal property of insulating material at cryogenic temperature. Thermal conductivity measurements on pre-impregnated fiber-glass epoxy composite are presented in the temperature . According to the principle of cryogenic thermal conductivity measurement, each mode of uncertainty and combined standard uncertainty were analyzed and calculated. The uncertainty analysis of thermal conductivity measurements mainly includes geometry of insulation layer, heat loss, temperature measurements, and mass flowmeter, as shown in Table 2. Highlights A new concept of measurement apparatus is developed to estimate thermal property of insulating material. For a given heat flux, temperature distribution in PPLP is measured. The thermal conductivity of PPLP is – W/m K for 50–80 K. The specific heat of PPLP is obtained by solving heat diffusion process using the same facility. For the presentation of the thermal conductivity of cryogenic insulation materials and their integral mean values an empirical function is suggested, with which experimentally found values can be.