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Determination of the thermal conductivity of the phase change heat storage material hydrated salts

Author: NieGuangHua
Tutor: ZhangZhiYing
School: Northwestern University
Course: Physical and chemical
Keywords: Hydrated salt Thermal conductivity Energy storage materials Relative method Instantaneous method
CLC: TB34
Type: Master's thesis
Year: 2001
Downloads: 409
Quote: 3
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Abstract


This article describes the condition of phase change thermal storage materials , and expounded the principle of measuring the thermal conductivity as well as the common determination of the thermal conductivity of several methods . Described in detail on the apparatus and the principle of the the thermistor measuring thermal conductivity , which is an instantaneous relative method . High accuracy of this method of testing , the operation is simple , fast, and simple equipment . Can be used for the thermal conductivity of the low melting solid and liquid measured. We use this method successfully determined for the first time the 10 kinds of hydrated salts from 10 ° C to 80 ° C the thermal conductivity , to overcome the difficulties which influence the results due to convection and thermal radiation . In the experiment, four reference material with a known thermal conductivity of the calibration of the experimental apparatus , the use of the relative error of the reference substance is ± 2% . The experimental results are given every 5K the thermal conductivity of the experimental values ??of the 10 kinds of hydrated salts , and their phase transition temperature were determined , and the resulting phase transition temperature of the experimental values ??is consistent with literature values ??. Finally, the experimental results are discussed, and errors are analyzed . Satisfactory results were obtained . Hydrated salt phase change latent heat , cheap , 100 ℃ thermal storage material . In practical applications , the thermal conductivity is one of the thermophysical properties of phase change thermal storage material indispensable data . The measurement data we can meet the actual needs of the 10-80 ° C temperature range .

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