Analysis of the temperature distribution in a guarded hot plate apparatus for measuring thermal conductivity

Thermal conductivity measurement of thermochemical storage materials

“…Besides, the samples can be easily and rapidly changed and the measurement is not restricted to a set of discrete temperatures. Among steady state methods, some authors [5,25] stated that the guarded hot plate (GHP) is considered as the most accurate and precise technique for low thermal conductivity materials. The guarded technique is widely applied and uses different hot elements, such as bar, cut-bar [26], cartridge, plate [27] as heat source.…”

A simple correlation for estimation of economic thickness of thermal insulation for process piping and equipment

“…Piping systems are also employed in many other situations including water supply, fire protection, and district cooling-heating applications. Various thermal insulation systems taking advantages of different types of thermal insulation materials on both organic (expanded plastics, wood wool, cork, straw, technical hemp) and inorganic basis (foamed glass, glass and mineral fibers) are being designed and tested [3], and new methods for analysing the properties of both insulation materials and insulation systems are being devised [4][5][6][7][8][9][10]. The particular products differ in their shape, flammability, composition and structure, what in a relation to designers' requirements assigns the possibilities of their application in engineering practice [3].…”

“…This is of particular advantage for process pipes because thinner layers of insulation reduces the surface area emitting heat and also reduces the outer surface that requires protection [12]. Over the past decades, several methods [1,2,4,8,9,11] for determining the optimum thermal insulation thickness have been developed. However, in practice, these approaches are not easy to use, since they require a detailed understanding of complex mathematical formulations.…”

Design and construction of a guarded hot plate apparatus operating down to liquid nitrogen temperature

“…Hahn et al 7 described a line-heat sources concept, which could generate a nearly isothermal profile within a discshaped plate. Xaman et al 8 employed a heater embedded in a central plate and guard ring to generate a heat flux, and applied the Green function formulation to compute the temperature distributions in the central plate and the guard plate. The comparison of the analytic results and the experimental measurements conducted on aluminum plates showed in good agreement with a standard deviation of 3%.…”