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عنوان فارسی مقاله:
اندازه گیری هدایت حرارتی و ارزش ظرفیت گرمایی ویژه مواد ناهمگن با یک دستگاه جریان گرما متر
عنوان انگلیسی مقاله:
Measuring thermal conductivity and specific heat capacity values of inhomogeneous materials with a heat flow meter apparatus
سال انتشار : 2017
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مقدمه انگلیسی مقاله:
1. Introduction
Thermal conductivity and specific heat capacity are among the most essential material properties of a building material. Thermal conductivity describes the ability of a material to conduct heat, and the specific heat capacity tells how much heat energy is absorbed or released depending on the temperature difference and mass [1]. These values are needed, among other uses, in thermal performance calculations. However, the published values for material properties are usually not sufficient for more accurate calculations. That is due to the fact that individual products in a product group, such as plasters, may have widely varying material properties. As many material properties are listed generically for whole material groups, values determined from the actual products are required to achieve a high level of accuracy in the calculations for a specific case. There are different kinds of methods to determine thermal conductivity. In the study [2] there is one method presented to determine thermal conductivity of insulation materials. The aim of this study was to observe the suitability of the heat flow meter apparatus for thermal conductivity and specific heat capacity tests of concrete, so it is known whether or not test results of inhomogeneous materials acquired with this apparatus are reliable. Also, specific heat capacity values for 14 different plasters were measured to get more accurate material properties. Specific heat capacity is usually tested with a calorimeter. One kind of calorimeter for defining specific heat capacity is used in the study [3]. However, the use of a heat flow meter apparatus has recently become possible as well. This is due to the approval of an American standard ASTM C1784-13 [4]. The standard describes how to use a heat flow meter apparatus for measuring thermal storage properties, i.e. specific heat capacity. Research on the subject is conducted by the developer of the apparatus, as well as other instances [5–7] and instructions on how to perform the tests have been given [4,8,9]. Excluding thermal contact resistance is one of the key factors when measuring thermal conductivity since it greatly impacts the accuracy and reliability of results [10–12].
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