Assessment of the NBS (National Bureau of Standards) 1-meter guarded-hot-plate limits. Final report

Technical Report · Thu Aug 01 04:00:00 EDT 1985

OSTI ID:6045904

Rennex, B G

Accurate measurement of the thermal resistance of insulation and building materials is a matter of national interest. A viable national calibration program must consist of accurate apparatuses, appropriate test methods, and calibration specimens available over the needed ranges of test and material parameters, such as temperature and apparent thermal conductivity. The apparatuses are operated according to the test methods to provide these calibration specimens. It is necessary to know the apparatus accuracy over the entirety of the operating ranges over which the calibration specimens are measured. The objective of this report is to evaluate the operating capability of the NBS 1-m Guarded-Hot-Plate apparatus according to three kinds of limiting factors. The first kind is the limits of temperature over which the various apparatus components can be used without suffering damage. The second kind is the limits of plate temperatures, specimen thickness, atmospheric pressure, and relative humidity that can be achieved with the existing control systems. The third kind is any limits on the values of apparent thermal conductivity, thermal resistance, or specimen thickness due to measurement error considerations.

• Research Organization: National Bureau of Standards, Washington, DC (USA). Center for Building Technology
• OSTI ID: 6045904
• Report Number(s): PB-86-108180/XAB; NBSIR-85/3221
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100 -- Energy Conservation
Consumption
& Utilization-- Buildings
42 ENGINEERING
420500* -- Engineering-- Materials Testing
ACCURACY
BUILDING MATERIALS
MATERIALS
MEASURING METHODS
PHYSICAL PROPERTIES
THERMAL CONDUCTIVITY
THERMAL INSULATION
THERMODYNAMIC PROPERTIES