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Lecturer(s)
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Těšinová Pavla, Ing. Ph.D.
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Hes Luboš, prof. Ing. DrSc.
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Course content
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Topics of lectures: 1. Principal definition of psychological, sensorial, ergonomic and thermo-physiological comfort. Individual aspects in clothing comfort evaluation. Animal skin strategy to survive in environment. 2. Psycho-sensoric principles of human perception. Stephen's law. Skin sensors. Moisture perception. Relation for total clothing comfort. Human body as a thermal engine. Energy storing and distribution in a body. 3. Heat transfer by conduction. Fourier's law. Temperature set points for a body and temperature limits. Thermal comfort for various levels of heat generated in a body. Textile applications. 4. Convection heat transfer. Free convection. Transient heating of thin plate by means of forced convection. Grasshof number. The effect of objects geometry on Nusselt number. Textile applications. 5. Heat transfer by radiation. Wien and Stephan-Boltzman laws. Black body. Surface emissivity of fabrics. Heating of a thin plate by means of radiation heat flow. Textile applications. 6. The use of phase change materials and system of evaluation of their thermal insulation efficiency (time of double increase of the effective thermal resistance). Textiles changing their absorption of infrared radiation heat according to the radiation level. Fibres with high solar energy absorption and low far IR energy emission. 7. Simple thermal model of a clothed human body. Practical values of thermal resistances of clothing (in Clo and Tog.). The effect of ventilation and body movement on body thermal loses. 8. Mass transfer models. Simultaneous heat and mass transfer and transfer analogies in textiles. Use of the generalized equations for mass, momentum and heat for specific examples. 9. Fundaments of wetting and wicking of textile fabrics. Contact angle, adhesion, capillary forces. Theory and definition of moisture absorptivity. 10. Fundaments of water vapour transfer between human body and environment. Lewis relationship. Fick´s laws. Sweating level as the function of skin and core temperature. Insensitive perspiration, perspiration by respiration, principal perspiration and their limits. 11. Application of semi-permeable membranes and coatings on fabrics. Application of clothing comfort research in comfort-improved fibres, engineered fabric construction. Parameters of yarns and filaments, which affect the thermo-physiological comfort of fabrics. 12. Tactile comfort. Fabric prickliness, Itchiness, Stiffness, Softness, Smoothness, Roughness, and Scratchiness. 13. Fit and aesthetic comfort. General aspects, construction factors, dimensional changes and the effects of fit on comfort and transport properties. Change in aesthetic behaviour. Improved finishes and coating. Comfort fibres and fabrics for active wear. Tutorials will be conducted to lectures and will deepen knowledge in comfort and transport properties calculation, measurement and results interpretation. Seminar work will be prepared and presented.
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Learning activities and teaching methods
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Self-study (text study, reading, problematic tasks, practical tasks, experiments, research, written assignments), Laboratory work, Lecture, Practicum, Seminár, E-learning, Students' portfolio, Students' self-study
- Class attendance
- 56 hours per semester
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Learning outcomes
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The main aim of the subject is to introduce student with principles of comfort an transport properties of heat and mass. To provide theoretical knowledge and experimental experience which anable to evaluate sensorical and thermo-physiological comfort. Student is going to differ transport propertis in clothing and technical textile applications.
Student will be able to differ between transport properties and be able to evaluate thermo-physical properties of textiles.
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Prerequisites
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unspecified
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Assessment methods and criteria
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Oral exam, Written exam
Credit: semestral works, activity during the semester in person or in the e-learning Exam: written and oral (in person or online)
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Recommended literature
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Assael, M.J., Trusler, P.M., Tsolakis, T.F. Thermophysical properties of fluids: an introduction to their prediction. London, 1996. ISBN 1-86094-009-9.
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Bird, R., Stewart, W., Lightfoot, E., šalamon, Š., Míka, V. Přenosové jevy: sdílení hybnosti, energie a hmoty. Praha, 1968.
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Bird, R., Stewart, W., Lightfoot, E. Transport phenomena. New York, 2007. ISBN 0-470-11539-4.
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Das, A., Alagirusamy, R. Science in clothing comfort. Hoboken, 2010. ISBN 978-81-908-0015-0.
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Hemzal, K., Chyský, J. Přenosové jevy v technice prostředí. Praha, 1989.
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Hes, L., Sluka, P. Úvod do komfortu textilií. Liberec, 2005. ISBN 80-7083-926-0.
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Li, Y., Layton, J.M. The science of clothing comfort: a critical appreciation of recent developments. Manchester, 2001. ISBN 1-870372-24-7.
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Majumdar, P. Computational methods for heat and mass transfer. New York, 2005. ISBN 1-56032-994-7.
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Šesták, J., Rieger, F. Přenos hybnosti, tepla a hmoty. Praha, 2004. ISBN 80-01-02933-6.
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Welty, J. Fundamentals of momentum, heat, and mass transfer. Hoboken, 2001. ISBN 0-471-38149-7.
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