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Title:MERJENJE TEMPERATURNEGA POLJA POVRŠINE IN TOPLOTNE PREHODNOSTI STEN Z INFRARDEČO KAMERO
Authors:Benko, Simona (Author)
Vaupotič, Nataša (Mentor) More about this mentor... New window
Repnik, Robert (Co-mentor)
Files:.pdf UNI_Benko_Simona_2012.pdf (2,83 MB)
MD5: 661DF76E09B0F2A0FD6F2E69DA2567FB
 
Language:Slovenian
Work type:Undergraduate thesis (m5)
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:V diplomskem delu predstavljam brezkontaktno merjenje temperature z infrardečo (IR) kamero. Najprej predstavim osnove za razumevanje termografije, podrobneje razložim sevanje črnega telesa ter vpliv emisivnosti in temperature telesa na natančnost meritev z IR kamero. Podrobno obravnavam prehod toplote skozi steno, kjer se toplota prenaša s kombinacijo prevajanja toplote skozi steno in konvekcije zraka ob notranji in zunanji strani stene. Nato predstavim delovanje in uporabo infrardeče kamere ter opišem programsko opremo ThermaCAM Researcher Professional. Osrednji del diplomskega dela predstavljajo meritve temperaturnega polja steklene plošče z IR kamero in uporaba IR kamere za določitev toplotne prehodnosti sten v šolskem modelu izolacijske hiše. Pri meritvah z IR kamero moramo biti najbolj pozorni na vrednost emisivnosti površine, saj so napake pri meritvi temperature zaradi nepravilne izbire emisivnosti lahko zelo velike. Zato predstavim metode, s katerimi lahko določimo emisivnost, kadar je ne poznamo. Na primeru meritve temperaturnega polja steklene plošče prikažem, kako s pravilno nastavljenimi parametri, kot so emisivnost, reflektirana temperatura, oddaljenost, vlažnost in temperatura okolice, natančno izmerimo temperaturo na površini opazovanega telesa. Pri poskusu postavim stekleno ploščo pred žarnico, ki segreva steklo. Ugotovim, da je temperaturno polje stekla odvisno od oddaljenosti žarnice od stekla. Na šolskem modelu izolacijske hiše s kombinacijo uporabe IR kamere in točkovnih termometrov izmerim temperature na notranji in zunanji strani stene in v nekaj milimetrov debeli plasti zraka ob steni. Določim temperaturni profil med zrakom v notranjosti in zunaj hiše v smeri pravokotno na steno. Izračunam toplotni tok in toplotno prehodnost sten ter ugotovim, kateri material je najboljši izolator. Nato določim debelino plasti ob steni, v kateri poteka konvekcija zraka, ocenim toplotno prevodnost gibajočega se zraka in izračunam toplotno prestopnost zraka pri naravni konvekciji zunaj in znotraj hiše.
Keywords:termografija, IR kamera, točkovni termometer, prenos toplote, toplotna prehodnost sten, emisivnost, termogram, temperaturno polje, šolski model izolacijske hiše.
Year of publishing:2012
Publisher:[S. Benko]
Source:Maribor
UDC:53(043.2)
COBISS_ID:19065096 New window
NUK URN:URN:SI:UM:DK:QQHUAYKO
Views:4053
Downloads:351
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:THE SURFACE TEMPERATURE FIELD AND THE HEAT TRANSFER THROUGH WALLS MEASURED WITH THE INFRARED CAMERA
Abstract:In the thesis the non-contact temperature measurement by infrared (IR) camera is presented. In the first part of the thesis I present thermography, the blackbody radiation and the influence of the body temperature and emissivity on the accuracy of the temperature measurements by IR camera. I study in detail the heat transfer through walls. I take into account that the heat is transferred both by the heat conduction through the wall and the convection of air at the inner and outer side of the wall. Finally, I discuss the use of the infrared cameras and describe the ThermaCAM Researcher Professional software. The central part of the thesis focuses on the measurements of the temperature field of a glass plate with an IR camera and the use of the IR camera to determine the heat transfer coefficient of walls in a school model of an insulated house. When measuring with the IR camera, we must know the emissivity of the surface, since errors in the measured temperature due to the incorrect choice of emissivity can be very large. Therefore, I introduce some methods which can be used to determine the emissivity when it is not known. Taking the measurements of the temperature field of a glass plate as an example, I show how one can measure accurately the temperature of the surface of the observed body by choosing the correctly pre-set parameters such as emissivity, reflected temperature, distance, humidity and temperature. During the experiment the glass plate is put in front of the lamp, which heats the glass. I find out that the temperature field of the glass depends on the distance of the glass bulb from the glass. On a school model of an insulated house I measure the temperature at the inner and outer side of the walls and in a few millimetres thick layer of air near the wall. Measurements are obtained by the IR camera and point thermometers. I determine the temperature profile between the air inside and outside the house in the direction perpendicular to the walls. I calculate the heat flow and thermal transmittance of the walls and find out which material is the best insulator. Then I determine the thickness of the layer near the wall in which the air convection takes place, I estimate the thermal conductivity of the moving air and calculate the heat transfer coefficient for natural convection of the air inside and outside the house.
Keywords:thermography, IR camera, point thermometer, heat transfer, heat transfer of walls, emissivity, thermogram, temperature field, school model of an insulated house.


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