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The plate thermometer as a mean of calculating incident heat radiation: a practical and theoretical study
2009 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The plate thermometer is a robust and simple instrument to use which can handle fierce environmental conditions. By measuring the temperature between the plate thermometer’s thin metal sheet and its insulation the adiabatic surface temperature and the incident radiation can be calculated. The virtual experiment, i.e. finite element temperature calculations, conducted during this investigation of the plate thermometer suggest using the thermal conduction coefficient equal to 8.43 W/m2K and the lumped-heat coefficient equal to 4202 J/m2K together with the one-dimensional equations with one degree of freedom introduced in this report. The thermal conduction coefficient is due to conduction in the metal plate and the insulation. The lumped-heat coefficient is due to energy needed to heat the materials. These coefficients are originally depending on the thermal properties of the metal sheet and the insulation combined with two- dimensional effects (in the virtual experiment) in these materials, especially in the metal sheet. The experiment in the Room Corner Test configuration (ISO 834) shows that the plate thermometer has an advantage to the heat flux meter when convection occurs on to the instruments and the incident radiation shall be estimated. Analyses also indicate that the greatest advantage of the plate thermometer over the heat flux meter is achieved when Tr and Tg are close to each other. Estimating the convective heat transfer coefficient is the weak point using both the plate thermometer and the heat flux meter. However, the coefficient for the plate thermometer can for both free and forced convection be estimated using the equations for simple geometries given in for example Holman (1992), while this is not the case for the heat flux meter.

Place, publisher, year, edition, pages
Keyword [en]
Technology, fire technology, plate thermometers, incident radiations, TASEF, Room Corner Test
Keyword [sv]
URN: urn:nbn:se:ltu:diva-53390ISRN: LTU-EX--09/183--SELocal ID: a68f7c6e-b66b-43fa-82e1-628234e08315OAI: diva2:1026764
Subject / course
Student thesis, at least 30 credits
Educational program
Fire Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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