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| Design and Construction of a Double-sides Guarded Hot Plate Apparatus at Liquid Nitrogen Temperature |
| LI Man-Feng-1, 2 , ZHANG Hua-1, JU Yong-Lin-1 |
| (1. Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai 200240, China;2. Institute of Environmental & Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China) |
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Abstract The principle and structure of a doublesides guarded hot plate apparatus (GHP) at liquid nitrogen temperature (-196 °C) were described . It is different with the traditional GHP in terms of the structure, heating method and temperature measurement. The method of the line heat source was applied for the meter and guard plates, and the liquid nitrogen containers were employed as the cold plate. The clamping assemblies and the sliding assemblies were also presented. The measurement methods of the temperatures, the input power, the meter area and the thickness of the specimens were given. The uncertainties for the measurement were also discussed.
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Received: 29 April 2011
Published: 28 April 2012
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