Abstract
In SOFC, accurately measuring the hotgas temperature is challenging due to low gas velocity, high wall temperature, complex flow geometries and relatively small pipe diameter. Improper use of low cost thermometry system such as standard Type K thermocouples (TC) may introduce large measurement error. The error could have a negative effect on the thermal management of the SOFC systems and consequential reduction in efficiency. In order to study the factors affecting the accuracy of the temperature measurement system, a mathematical model of a TC inside a pipe was defined and numerically solved. The model calculated the difference between the actual and the measured gas temperature inside the pipe. A statistical Design of Experiment (DOE) approach was applied to the modelling data to compute the interaction effect between variables and investigate the significance of each variable on the measurement errors. In this study a full factorial DOE design with six variables (wall temperature, gas temperature, TC length, TC diameter and TC emissivity) at two levels was carried out. Four different scenarios, two sets of TC length (610.5 mm and 1722 mm) and two different sets of temperature range (550650 °C and 750850 °C), were proposed. DOE analysis was done for each scenario and results were compared to identify key parameters affecting the accuracy of a particular temperature reading.
Original language  English 

Article number  012004 
Journal  Journal of Physics: Conference Series 
Volume  547 
Issue number  1 
DOIs  
Publication status  Published  1 Jan 2014 
Event  32nd Italian Union of ThermoFluidDynamics Heat Transfer Conference, UIT 2014  Pisa, Italy Duration: 23 Jun 2014 → 25 Jun 2014 
Bibliographical note
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.Published under licence by IOP Publishing Ltd
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Robert Morgan
 School of Arch, Tech and Eng  Professor of Thermal Propulsion Systems
 Advanced Engineering Centre
Person: Academic