Materjali soojusjuhtivuse ekspressmõõtur
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Kuupäev
2019
Kättesaadav alates
6.09.2019
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Soojusjuhtivuse mõõturid on raskesti kättesaadavad ning soojusjuhtivust mõõdetakse
üldjuhul statsionaarse mõõtmeseadmega varustatud laboris.
Käesoleva magistritöö eesmärgiks oli konstrueerida materjali soojusjuhtivuse
ekspressmõõturi prototüüp.
Materjali soojusjuhtivuse mõõtmine seisneb uuritava katsekeha ühe pinna
kuumutusplaadiga stabiilse temperatuuriga kuumutamises ning materjali läbiva soojusvoo
stabiliseerumisel, teise, vastaspoolse pinna temperatuuri fikseerimises.
Konstrueeritud süsteem võimaldab täita järgmiseid nõudeid:
Temperatuuride ja kuumutusplaadi võimsuse mõõtmine ja salvestamine välisele
andmekandjale;
Kuumutusplaadi temperatuuri hoidmine püsival väärtusel;
Mõõtmisprotsessi olekuparameetrite salvestamine ja reaalajas monitoorimine
soojusjuhtivuse mõõtja arvutis.
Töö esimene pool kirjeldab Scilab Xcos keskkonnas modelleeritud ekspressmõõturi
soojuslevi elektrilist aseskeemi ja simulatsiooni tulemusi. Töö teises pooles valiti eelpool
loetletud nõuete täitmiseks vajalikud seadmed, millele järgnes mõõturi konstrueerimine ja
mõõturi juhtkontrolleri programmeerimine. Testmõõtmiste põhjal selgus, et mõõturi
süsteem on toimiv. Lisaks on töö autori arvamusel käesoleva töö lisandväärtuseks
modelleeritud ekspressmõõturi mudel mille abil on võimalik mõõturi soojuslev
Thermal insulation test gauge systems are difficult to access and measurements are generally performed in a laboratory which is equipped with a stationary measuring device. The purpose of this Master's thesis was to construct a prototype of thermal insulation test gauge. Measuring the thermal conductivity of the material consists of heating the sample surface within stable temperature hot plate and when the heat flow through the material stabilizes, the temperature of the opposite surface will be recorded. The designed system has to be met with the following requirements: Measuring and saving data of temperatures and hotplate electrical power to external storage device; Automatic hot plate temperature control; Recording and real-time monitoring of the measurement process on a local computer. The first part of the work describes in Scilab Xcos's modeled heat transfer simulation of test gauge which is based on electrical schematic. In the second half of the work, the equipment which meets the above requirements was chosen. For next, the programming of the controller and construction was made. Testing results showed that constructed gauge is functional system. In addition, the author believes that the extra added value of this work is in Scilab Xcos built gauge model which makes better to understand the thermodynamic laws of the meter's heat transfer and it is also a useful tool for further development.
Thermal insulation test gauge systems are difficult to access and measurements are generally performed in a laboratory which is equipped with a stationary measuring device. The purpose of this Master's thesis was to construct a prototype of thermal insulation test gauge. Measuring the thermal conductivity of the material consists of heating the sample surface within stable temperature hot plate and when the heat flow through the material stabilizes, the temperature of the opposite surface will be recorded. The designed system has to be met with the following requirements: Measuring and saving data of temperatures and hotplate electrical power to external storage device; Automatic hot plate temperature control; Recording and real-time monitoring of the measurement process on a local computer. The first part of the work describes in Scilab Xcos's modeled heat transfer simulation of test gauge which is based on electrical schematic. In the second half of the work, the equipment which meets the above requirements was chosen. For next, the programming of the controller and construction was made. Testing results showed that constructed gauge is functional system. In addition, the author believes that the extra added value of this work is in Scilab Xcos built gauge model which makes better to understand the thermodynamic laws of the meter's heat transfer and it is also a useful tool for further development.
Kirjeldus
Magistritöö
Energiakasutuse erialal
Märksõnad
magistritööd, soojusjuhtivus, programmeerimine