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Experimental Study on Correction of Thermal Conductivity Obtained by Heat Flow Method using Commercial Guarded Hot Plate Method Apparatus
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 Title & Authors
Experimental Study on Correction of Thermal Conductivity Obtained by Heat Flow Method using Commercial Guarded Hot Plate Method Apparatus
Lee, Jin-Sung; Kim, Kyung-Su; Kim, Yooil; Woo, Suck-Min; Yun, Seungjin;
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This paper addresses experimental methodologies to measure the temperature-dependent thermal conductivity of the insulation materials popularly used for LNG cargo containment systems. The measurement techniques considered in this paper are the guarded hot plate (GHP) method and heat flow method (HFM). The former is based on the power supplied to the hot plate to keep the temperature constant, and the latter is based on a direct heat flux measurement. In order to improve the accuracy of the HFM, the thermal conductivity obtained by GHP was cross-compared with the HFM results, and a calibration factor was derived. It was found that the thermal conductivities measured by the two methods corresponded well under room temperature, but the deviation tended to slightly increase as the temperature decreased. Because of the easy installation and operability of HFM, it can be used to measure thermal conductivity in a large scale mock-up test or unit insulation panel test, where the GHP method is difficult to apply.
Heat flow method;Guarded hot plate method;Heat flux sensor;Sensitivity;Thermal conductivity;
 Cited by
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