Download or read book AUTOMATED HIGH TEMPERATURE GUARDED HOT PLATE APPARATUS FOR MEASURING APPARENT THERMAL CONDUCTIVITY written by Jerome G. Hust and published by . This book was released on 1988 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Automated High temperature Guarded hot plate Apparatus for Measuring Apparent Thermal Conductivity written by Jerome G. Hust and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Automated High Temperature Guarded Hot Plate Apparatus for Measuring Apparent Thermal Conductivity of Insulations Between 300 and 750 K written by JG. Hust and published by . This book was released on 1990 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: An automated guarded-hot-plate apparatus was designed and built to meet the requirements of ASTM standard test method C 177 for measuring the thermal transmission properties of thermal insulation. The apparatus is controlled by a scientific desktop computer. Measurements with this apparatus can be performed at temperatures from 300 to 750 K in environments of different gases at pressures ranging from atmospheric pressure to roughing-pump vacuum. A novel design for a thermocouple device is used; this device more accurately senses the average temperature over the surface of each heater plate. An improved algorithm for the control sequence provides more stable heater powers and specimen temperatures. Initially the algorithm brings the system rapidly to a temperature setpoint with minimal overshoot. It also permits highly sensitive control of the plate temperatures in later phases of the measurement sequence when thermal stability of the specimen boundaries is very important in measuring the thermal conductivity with high precision. Overall uncertainties of thermal conductivities at atmospheric pressure are 2% at 300 K and 3% at 750 K.

Download or read book Automated Low Temperature Guarded Hot Plate for Measuring Apparent Conductivity written by WP. Dube' and published by . This book was released on 1991 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guarded-hot-plate apparatus has been developed for measuring the apparent thermal conductivity of flat-slab thermal insulation materials at low temperatures. Relevant ranges of physical variables which can be accommodated (under different conditions) are: diameter, 203 mm (fixed); thickness, 5 to 30 mm; mean specimen temperatures, 100 to 400 K; temperature differences, 3 to 150 K; temperature gradients, 0.1 to 10 K/mm; and thermal resistance, 0.02 to 1.5 K.m2/W. Conductivity can be measured in dry air, gaseous nitrogen, helium, argon, or neon, or in vacuum. Apparent conductivity of an insulation material can be studied as a function of temperature, fill-gas pressure, or species, giving insight into the heat-transfer processes present in the material. Control of the main heater may be stabilized either at constant heater power or constant heater temperature. This apparatus will be useful in development of low-temperature Standard Reference Materials, and is being used to study heat transfer in closed-cell foam insulation containing HCFC blowing agents.

Download or read book Guarded Hot Plate and Heat Flow Meter Methodology written by C. J. Shirtliffe and published by ASTM International. This book was released on 1985 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Guarded hot plate Apparatus for Measuring Effectiv Thermal Conductivity of Insulations Between 80 K and 360 K written by David R. Smith and published by . This book was released on 1982 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of the National Institute of Standards and Technology Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1991 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1977 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Intra Laboratory Comparison of a Line Heat Source Guarded Hot Plate and Heat Flow Meter Apparatus written by RR. Zarr and published by . This book was released on 1991 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The apparent thermal conductivity and thermal resistance of several building insulations were determined at the National Institute of Standards and Technology (NIST) using three apparatus. Reference values were determined with NIST's 1-metre Line-Heat-Source Guarded Hot Plate (GHP). The other two apparatus were heat-flow-meter (HFM) apparatus calibrated with a Standard Reference Material of fibrous-glass board (138 kg/m3). The apparatus -- NIST's 1-metre GHP; the 610 mm HFM; and the 305 mm HFM -- were operated at a mean temperature of 24°C and temperature difference of 22°C across the thickness of the specimen. Measurements of thermal conductivity were determined for individual specimens nominally 25 mm thick, covering a range of thermal conductivity from 0.02 to 0.16 W/(m•K). The thermal resistance of thick specimens (1 to 7 m2•K/W) of cellular plastic, fibrous and loose-fill insulation was also determined. Deviations from reference values of the GHP were calculated for the HFM apparatus. For the 610 mm HFM, the majority of deviations were within ±3% of the GHP. Substantial improvement was achieved by calibrating the 305 mm HFM as a function of thickness; however, deviations ranged from +1.5 to +9.2% from the GHP. The apparatus, test procedure, and analysis of the deviations are described in the paper.

Download or read book Insulation Materials Testing and Applications written by D. L. McElroy and published by ASTM International. This book was released on 1990 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the symposium held in Bal Harbour, Florida, December 1987. Rising energy prices have been encouraging work on the use of thermal insulation to conserve energy. Here, more than 50 papers discuss new materials, assessments and properties of foams, loose-fill behavior, system performance

Download or read book Publications of the National Institute of Standards and Technology 1988 Catalog written by Rebecca J. Pardee and published by . This book was released on 1989 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Guarded Hot plate Apparatus for the Measurement of Thermal Conductivity written by HAROLD J. HODGE and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Construction and Testing of Guarded Hot Plate Apparatus for Thermal Conductivity Measurements written by Robert John Waters and published by . This book was released on 1978 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermal Conductivity written by C.J. Cremers and published by Springer Science & Business Media. This book was released on 1990 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fifty-one papers (and three keynote addresses) on contemporary theoretical issues and experimental techniques pertaining to the underlying factors that control heat-conduction behavior of materials. The latest findings on insulation, fluids, and low-dimensional solids and composites are reviewed as

Download or read book Evaluation of a 20 inch Guarded Hot plate Thermal Conductivity Apparatus Range 50 F to 250 F written by C. W. Kaplar and published by . This book was released on 1971 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Insulation Materials Testing and Applications 2nd Volume written by Ronald S. Graves and published by ASTM International. This book was released on 1991 with total page 647 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the syposium of the same name held in Gatlinburg, Tennessee, October 1991, address issues connected with reflectives, radiant barriers, radiation control coatings; economics and energy impact; long-term thermal performance of foams; assessments and properties of foams; convection