Measurement of Transient Surface Temperature of Conductive Solid Using Thermocouples with Different Junctions

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Vol. 148, No. 1, January 2013, pp. 22-27

Measurement of Transient Surface Temperature of Conductive Solid Using Thermocouples with Different Junctions

^{1, 2, *}Zhiqiang SUN, ^{1, 2}Yu CHEN, ^{1, 2}Xing CHEN

¹ School of Energy Science and Engineering, Central South University,
Changsha 410083, China

² Hunan Key Laboratory of Energy Conservation in Process Industry,
Central South University, Changsha 410083, China

^* E-mail: zqsun@csu.edu.cn

Received: 4 October 2012 /Accepted: 24 January 2013 /Published: 31 January 2013

Abstract: Thermocouples are widely used for surface temperature measurement in scientific researches and engineering applications due to their low cost and simple configuration, especially under formidable working conditions. In this paper we investigate the performances of the thermocouples with different junctions for measuring transient surface temperature. Experiments were carried out on an iron plate that was heated continuously first and cooled naturally afterward. Here we find that the isothermal junction has the least measurement errors and degree of deviation, whereas the dynamic property of the separate junction is the best. In the temperature rise period, the measurement errors and the degree of deviation of the same type thermocouples decrease with the thermoelement’s diameter, but these parameters of the thermocouples with identical thermoelement diameter increase with the heating power. In the period of temperature drop, the junction form has minor influence on the measurement errors and the degree of deviation of the thermocouples with identical thermoelement diameter. This study is of significance to improve the performance of the thermocouples for measuring transient surface temperature.

Keywords: Surface temperature, Transient measurement, Conductive solid, Thermocouple, Junction form, Degree of deviation

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1, 2, * Zhiqiang SUN, 1, 2 Yu CHEN, 1, 2 Xing CHEN

^{1, 2, *}Zhiqiang SUN, ^{1, 2}Yu CHEN, ^{1, 2}Xing CHEN