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Title:Vpliv kapljevin na toplotno prevodnost tkanin
Authors:Klemenčič, Eva (Author)
Slavinec, Mitja (Mentor) More about this mentor... New window
Repnik, Robert (Co-mentor)
Files:.pdf MAG_Klemencic_Eva_2014.pdf (650,58 KB)
MD5: FE43084C6245FBF6CF05BBEC0FA274E8
 
Language:Slovenian
Work type:Master's thesis/paper (mb22)
Typology:2.09 - Master's Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:V magistrskem delu so predstavljeni rezultati meritev toplotne prevodnosti vpojnih tkanin pri različnih relativnih deležih kapljevine v tkanini. Eksperimentalno delo smo izvedli za tri vzorce bombažnih tkanin z različno gostoto vezave in različnih debelin. Merilno napravo smo prilagodili tako, da lahko toplotno prevodnost tkanine določimo na dva načina: z analizo rezultatov nestacionarnega dela meritve ali z analizo rezultatov v stacionarnem stanju. Izračunane vrednosti toplotne prevodnosti se v okviru napake meritev po obeh načinih analize rezultatov ujemajo. Za izračun toplotne prevodnosti tako ni treba čakati na vzpostavitev stacionarnega stanja, kar omogoča krajši čas meritve in s tem manjše napake zaradi izhlapevanja kapljevine. Meritve potrjujejo, da je efektivna toplotna prevodnost tkanine pri majhnih vlažnostih premo sorazmerna z relativnim deležem kapljevine v tkanini. Z naraščajočo vlažnostjo se efektivna toplotna prevodnost vlažne tkanine ustali okrog ene mejne vrednosti, preden je tkanina nasičeno vlažna. Vpliv kapljevin na efektivno toplotno prevodnost tkanine smo raziskali s tremi kapljevinami, ki imajo različne toplotne prevodnosti: vodo, acetonom in terpentinom. Efektivna toplotna prevodnost tkanine se v vseh primerih ustali okrog vrednosti, ki je primerljiva s toplotno prevodnostjo kapljevine prisotne v tkanini. Stopnja vlažnosti, pri kateri se efektivna toplotna prevodnost tkanine ustali, se za različne kapljevine razlikuje. Najbližje nasičeni vlažnosti se to zgodi pri vodi, vidno drugače je pri terpentinu, aceton pa je nekje vmes. Eksperimentalne rezultate meritev smo primerjali s teoretično napovedjo. Ugotovili smo, da model, ki upošteva le vpliv tkanine in kapljevine (dvoparametrični model), dobro opisuje odvisnost efektivne toplotne prevodnosti vlažne tkanine pri relativno majhnih vlažnostih. Pri večjih deležih kapljevine pa so odstopanja večja. V ta namen smo model nadgradili tako, da smo upoštevali tudi vpliv zraka v tkanini, ki ga kapljevina z močenjem izpodriva (triparametrični model). Tako izpopolnjen model se je izkazal za primernejšega predvsem pri večjih deležih vlage.
Keywords:toplota, prevajanje toplote, toplotno udobje, toplotna prevodnost, vlažnost, bombažna tkanina, eksperimentalne meritve, model
Year of publishing:2014
Publisher:[E. Klemenčič]
Source:Maribor
UDC:543.58:536.2:677.21 (043.2)
COBISS_ID:20863752 New window
NUK URN:URN:SI:UM:DK:ENXCMOKJ
Views:5167
Downloads:221
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:The impact of liquids on thermal conductivity of fabrics
Abstract:This thesis presents the results of measurements of the thermal conductivity of fabrics for different relative proportions of liquid in the fabric. The experimental work was performed on three samples of cotton fabrics with different density and thickness. The measuring device was adapted to measure the dynamics of heat conduction. Therefore, the thermal conductivity of the fabric can be determined in two ways: by the data obtained in unsteady or steady state. We confirmed that the value of thermal conductivity, using these two methods of data processing, adds up. The capability of calculating the thermal conductivity in the unsteady state shortens measurement time and consequently minimizes errors due to evaporation of liquids. We confirmed that the experimental results at low relative proportions of liquids in the fabric followed linear dependence of thermal conductivity. We examined the effect of liquids with different thermal conductivities. The measurements were carried out with water, acetone, and turpentine. The effective thermal conductivity of the fabric at higher relative proportions of liquid stabilizes around a value slightly higher than the thermal conductivity of liquid absorbed in the fabric. Experimental results were compared with the theoretical two parametric model. The matching between two parametric model prediction and actual experimental results at higher proportions of liquids is small. We have upgraded this model in three parametric model. In addition to the thermal conductivity of the fabric and liquid, we consider also the thermal conductivity of air and the porosity of the fabric. The upgraded model describes the experimental results better, especially at higher proportions of liquids in the fabric.
Keywords:heat, heat conduction, thermal comfort, thermal conductivity, moisture, cotton fabric, experimental measurements, model


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