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2016 » Papers » Volume 3 » SOFWARE APPLICATION FOR DETERMINING THE FUNCTIONAL THERMAL FIELD OF THE TEXTILE 1. SOFWARE APPLICATION FOR DETERMINING THE FUNCTIONAL THERMAL FIELD OF THE TEXTILE Authors: Farima Daniela, Buliga Valentin, Curteza Antonela Volume 3 | DOI: 10.12753/2066-026X-16-251 | Pages: 498-505 | Download PDF | Abstract
One of the most important issues that can be solved by using the numerical values of the thermo-physiological units (thermal resistance and resistance to the passage of the steam) is to establish the thermal field for using a textile product/apparel. The functional thermal field of a textile product/apparel is given by the variation range of the environmental temperature, situated between its minimum temperature tamin [oC] and the maximum temperature tamax [oC], when the wearer feels comfortable. This clearly indicates if the textile products/apparel corresponds to their scope of use. The scientific design of the textile materials/apparel aims for them to be functional in a wide range of environmental conditions and physical effort of the body, so that the wearer perceives them as comfortable. Then we can say that such textile material/apparel fulfills its thermal-physiological function correlated to the requirements resulted from the field of use. The first part of this paper shows the theoretical calculation algorithm of the functional thermal field and a concrete example of determining it for 6 variants of layered jersey made of cotton and polypropylene, for sport, and the second part presents a software application for determining the functional thermal field. This software application has the role to simplify the workload and to reduce the time to determine the variation range of the thermal field, allowing the possibility to simulate, within a short time, the different situations referring to the condition of the body, the environmental conditions and the thermal and physiological characteristics of the analyzed textile materials. This application needs the a database with the input data. This input data is represented by: produced metabolic heat M [W]; average temperature at the skin surface ts [?C]; air temperature of the environment ta [?C]; the area of the body F [m2]; thermal of the textiles Rt [m2?C/W]; discomfort factor d; partial pressure of the saturated water vapours at the skin surface ps [mm. col. Hg. ]; partial pressure of the water vapours in the environment pa [mm.col.Hg.]; resistance of the textiles to the passage of the vapours Rv [mm.Hg.m2/W]; thermal variation ?? [?C], individual's physical load weight m [Kg]; body weight G [Kg]; travel speed vd [m/s]; road's inclination p [%]. Based on the input data, the software application calculates the values of the output data: the energy consumed under the form of mechanic work Lm [W]; the quantity of heat lost by breathing Qres [W]; the index of permeability to wet heat im, the minimum temperature of the environment tamin [oC] and the maximum temperature of the environment tamax [oC] that will delimitate the thermal field of the analysed materials. Should the thermal field need modification, in the event it does not correspond to the field of use of the textiles / apparel, the application provides the possibility of going back to the database in order to establish other values for the input data. | Keywords
software application; input data; output data; functional thermal field of the textiles |
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