Test method thermal conductivity

The calorimeter method is an older technique which is a direct measurement of Fourier s law. It is one of the ASTM [2] standard tests for thermal conductivity, designation C201. The experimental configuration is shown in Figure 9.3. A SiC slab... 

From the autoclave testing, it is concluded that in case of a runaway, the substance produces a significant quantity of gases. The end stage of the runaway will certainly result in a thermal explosion. The venting evaluation should be conducted by the test methods and calculation procedures described in Chapter 3. 

It is important to note that Vie and Kjelstrup [250] designed a method of measuring fhe fhermal conductivities of different components of a fuel cell while fhe cell was rurming (i.e., in situ tests). They added four thermocouples inside an MEA (i.e., an invasive method) one on each side of the membrane and one on each diffusion layer (on the surface facing the FF channels). The temperature values from the thermocouples near the membrane and in the DL were used to calculate the average thermal conductivity of the DL and CL using Fourier s law. Unfortunately, the thermal conductivity values presented in their work were given for both the DL and CL combined. Therefore, these values are useful for mathematical models but not to determine the exact thermal characteristics of different DLs. 

BS 874-3.1, 1987. Methods for determining thermal insulating properties. Tests for thermal transmittance and conductance. Guarded hot box method. 

ASTM D2214, 2002. Standard test method for estimating the thermal conductivity of leather with the Cenco-Fitch apparatus. 

ASTM E1952, 2001. Standard test method for thermal conductivity and thermal diffusivity by modulated temperature differential scanning calorimetry. 

No experimental data on the effective thermal conductivity of an assemblage of micron size zeolite crystals under the conditions of sorption tests used in the examples above could be found in the literature. However, several methods are available for the calculation of k for an assemblage of particles with void fraction f. The thermal conductivities of the solid phase (k ) and the gas phase (k ) in the voids are needed [29]. We Bsed the method develop d by Maxwell. 

For high fiber content, one can approximate the thermal conductivity of the composite by the thermal conductivity of the fiber. The thermal conductivity can be measured using the standard tests ASTM Cl 77 andDIN 52612. A new method currently being balloted (ASTM D20.30) is preferred by most people today. 

Within ASTM, technical committees associated with plastics, electrical materials, textiles, protective clothing, thermal insulation, consumer products, detention and correctional facilities, and ships have developed tests that are often application tests that are of specific interest to the products involved. One fire test has spawned more application standards than any other, primarily because of its vast use in the United States ASTM E 84 (Steiner tunnel). Thus, NFPA 262, UL 1820, UL 1887, ASTM E 2231, ASTM E 2404, ASTM E 2573, ASTM E 2579, and ASTM E 2599 are all test methods and practices based on the Steiner tunnel test. In some cases, the base apparatus is being modified (although usually it is permissible to conduct the ASTM E 84 test in the apparatus of the other test, but it is often not permissible to conduct the other test in any apparatus complying with the ASTM E 84 apparatus). The other test method that has resulted in many application standards is the cone calorimeter the standards are ASTM D 5485, ASTM D 6113, ASTM E 1474, ASTM E 1740, and ASTM F 1550. 

ASTM C201-86, Standard Test Method for Thermal Conductivity of Refractories , Annual Book of ASTM Standards, American Society for Testing and Materials, Philadelphia, PA. 

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