Author/Editor		Mekjavić, Igor B; Tomšič, Martin; Rodman, Samuel
Title		Merjenje toplotne izolacije gorniških čevljev
Translated title		Determination of thermal insulation of hiking shoes
Type		članek
Source		Med Razgl
Vol. and No.		Letnik 41, št. 2-3
Publication year		2002
Volume		str. 183-6
Language		slo
Abstract		A thermal foot manikin was developed for the determination of thermal insulation (I, m2 K/W) of footwear. The thermal foot manikin calculates the thermal insulation of 10 individual segments of the foot. Each copper segment of the manikin contains an electric heater and a temperature sensor. Insulation at each segment is determined by accounting for the difference in temperature between the segment's surface and the surrounding medium, and the electrical power required by the segment's heater to maintain the segment's surface temperature at a pre-determined level under the prevailing conditions. The immersion insulation values obtained using the prototype Thermal Foot Manikin were compared with: a) measurements of thermal insulation based on the temperature difference between the segment's surface and water, and the heat flux, and b) measurements of thermal insulation based on the same prinicple as in (b), but with a human subject. The obtained values of thermal insulation were similar at all sites when determined with the Thermal Foot Manikin. Some regional differences were observed between the results obtained with a human-foot and the manikin. These discrepancies were attributed to differences in the goodness-of-fit of the test boot.
Summary		Razvit in izdelan je bil model stopala za določanje toplotne izolacije obuval.Model določa toplotno izolacijo desetih posameznih delov stopala - segmentov. Vsak posamezen segment je oblečen v bakreno pločevino, na katero sta pritrjena električni grelec in temperaturno tipalo. Toplotna izolacija posameznega segmenta je izračunana: iz temperaturne razlike med segmentom in medijem, ki obkroža obuvalo, ter moči, porabljene za vzdrževanje konstante, vnaprej določene, tipične temperature segmenta. Primerjane so vrednosti, pridobljen,e s pomočjo modela stopala, in: a) vrednosti, izračunane iz hkratno merjenih temperaturnih razlik med segmenti modela stopala in okolico ter merjenih toplotnih tokov; b) vrednosti, pridobljene na enak način kot (a), vendar na človeškem stopalu. Vrednosti toplotne izolacije, določene z modelom stopala na oba zgoraj opisana načina, so primerljive. Opažena so bila odstopanja na določenih segmentih med modelom stopala in človeškim stopalom. Razlike so pripisane različni kakovosti stika med čevljem in modelom ter človeškim stopalom.
Descriptors		MOUNTAINEERING SHOES THERMAL CONDUCTIVITY