Guarded Hot Plate GHP 456 Titan® and GHP 456 HT Titan® Method, Instrumentation, Applications Analyzing & Testing

The Absolute Method for Testing Insulation Materials Insulation materials are growing in significance in a number of applications, including the insulation of buildings. Improved insulation reduces energy use and consequently heating costs for each individual household or industrial operation. How is a particular insulation material performing? How can cryo tanks be insulated in the best possible way? Does cryogenic insulation reliably prevent heat exchange? What is the optimum insulation for furnaces operating under different temperature, gas or pressure conditions? Is the thermal conductivity...

The hot plate and the guard ring are sandwiched between two samples of the same material and approximately the same thickness, d. The great advantage of the GHP method is that it is an absolute method; i.e., no calibration or correction is required at all. The thermal conductivity values result in the stationary state simply from the: Cold plates are placed above and below the samples. All plate temperatures are controlled such that a well‐ defined, user‐selectable temperature difference, ΔT, is established between the hot and the cold plates – and thus across the sample thickness. The guard...

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The Right Version for Every Application Controlled and Adaptive Cooling Devices Two versions of the GHP 456 Titan® exist for the investigation of insulating materials, e.g., cryogenic insulation or insulation of hightemperature-furnaces. The instruments cover an extremely broad temperature range; however, the actual minimum achievable working temperature depends on the cooling system used. Various cooling options are available for the system including pressurized air which allows for measurements at temperatures as low as 50°C and a chiller which permits 20°C. The liquid nitrogen (LN2) system...

Measurement Accuracy Temperature Measurement From ISO to ASTM The setup and usage of a GHP instrument are described in international standards such as ISO 8302 or ASTM C177. For the high‐temperature range, the technical specification DIN CNT/ TS 15548‐1 exists. The setup, dimensions and temperature sensors of the GHP 456 Titan® are based on these standards. Correct Results The system fulfills the accuracy requirements of ±2% at room temperature and ±5% across the entire temperature range, as stipulated by standard ISO 8302. There are certified standard materials such as IRMM 440 as well as SilCal1100*...

Testing Insulation Materials at Low and High Temperatures Flexible in the Choice of Test Conditions – From Vacuum to Defined Atmospheres Porous or Fibrous Insulation The vacuum‐tight design of the GHP 456 Titan® is a must for defined atmospheres at the specimen’s site: It allows for the application of normal conditions, dry air, or inert, oxygen-free purge gas. The instrument also allows for measurement in a vacuum under pressures of down to 5 ·10‐4 mbar (0.05 Pa). All of these possibilities are of particular interest for porous or fibrous insulations since in these cases, the thermal conductivity...

Correct Results Certified/indicative values SilCal1100 GHP NETZSCH The plot shows a measurement on IRMM 440 between ‐160°C and 50°C. The test results are compared with certified values by IRMM (indicative values below ‐10°C). 0.18 Thermal Conductivity /W/(m·K) Thermal Conductivity /W/(m·K) Are the measured thermal conductivity values within the tolerances required by the standards? This important question can only be answered by comparing the measured data with those in literature. Various certified reference materials exist for this purpose, e.g., NIST* SRM 1450D for the temperature range from...

Calcium Silicate – RoundRobin Test Results Porous calcium silicate SilCal1100 (from CALSITHERM Silikatbaustoffe GmbH) was tested in a round‐robin experiment. Agreement with the round‐robin values is approx. 1% to 2% at 100°C and approx. 5% at 600°C. * Hans-Peter Ebert, Frank Hemberger; Bavarian Center of Applied Energy Research, Intern. J. of Thermal Sciences (6/2011) Thermal conductivity of SilCal1100 in comparison with the published round‐robin values (solid line). The dotted lines represent the standard uncertainties of the round‐robin values (±3% increasing to ±7%) while the error bars reflect...

Thermal Conductivity / Expanded Glass Granulate This plot presents a comparison of a test with a heat flow meter (HFM) at room temperature and a GHP test down to ‐160°C. The two sets of results agree perfectly. Additionally, the GHP result shows the impact of cell‐gas condensation between ‐50°C and ‐125°C. Insulation of modern house roofs, VDI/keymark ships cryo‐tanks or evenvalues requires NETZSCH GHP materials featuring both low thermal conductivity and high mechanical stability. Polyurethane (PUR) foams offer these properties. The most effective way to prevent ice dams 200 is to250 300 350...

Thermal Conductivity /10-3 W/(m·K) Thermal Conductivity /W/(m·K) Expanded Glass Granulate Temperature Difference /K VDI/keymark values High‐Temperature Fiberglass Insulation This plot shows a GHP measurement on the most common type of insulation made of molten glass spun into microfibers. Fiberglass is commonly used in different types of insulation: blanket (batts and rolls) and loose‐fill and is also available as rigid boards and duct insulation. Thermal conductivity as a function of temperature is determined using the GHP HT Titan® between room temperature and 500°C. Thermal Conductivity /W/(m·K)...

THE HIGHLIGHT OF PROTEUS® SOFTWARE: Operating Systems – Windows Professional, Ultimate Pro and Enterprise The GHP software comes with a 32‐/64‐bit Windows operating system and allows for connection to a touch screen, keyboard and mouse and the use of a toolbar with shortcut buttons. SmartMode – Popular with Beginners and Respected by Professionals The convenient SmartMode allows for the prompt start of a measurement via Wizard, via methods which were defined by the user beforehand (known as User Methods), or via Predefined Methods supplied for the NIST 1450D, IRMM 440 and SilCal1100 standard...