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Dynamic Breathability : = Mapping the Gaps Between Static and Dynamic Benefits of Fabric.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Dynamic Breathability :/
其他題名:	Mapping the Gaps Between Static and Dynamic Benefits of Fabric.
作者:	Abedin, Faisal.
面頁冊數:	1 online resource (244 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-11, Section: A.
Contained By:	Dissertations Abstracts International84-11A.
標題:	Textile fibers. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30400550click for full text (PQDT)
ISBN:	9798379472535

Dynamic Breathability : = Mapping the Gaps Between Static and Dynamic Benefits of Fabric.
Abedin, Faisal.

Dynamic Breathability :Mapping the Gaps Between Static and Dynamic Benefits of Fabric. - 1 online resource (244 pages)

Source: Dissertations Abstracts International, Volume: 84-11, Section: A.

Thesis (Ph.D.)--North Carolina State University, 2023.

Includes bibliographical references

High-regain fibers have been shown to have exothermic effects, although there have not been reliable tests to demonstrate these effects on the human body. The ISO 16533 standard test method for determining the exothermic and endothermic behavior of textiles under changing relative humidity (RH) conditions (from 10% to 90%) can only demonstrate the increase in temperature, yet has a number of limitations for sample size, test environments, and test set up. This investigation seeks to understand the relationship between the exothermic and endothermic behavior of textile fibers (wool, cotton, viscose, and polyester) while absorbing moisture and its effect on physiological factors by developing a new fabric test method to characterize the fabric's behavior in transient conditions.Firstly, all the reliable fabric test methodologies were explored to determine this exothermic behavior. The test includes standard, and dynamic regain tests, ISO 16533, and dynamic hot plate tests. Comparing the test methods allowed us to properly identify the limitations of those methods, which allowed us to consider more practical test protocols for garment testing with manikin and human trials.The exothermic behavior of the fabrics was investigated using a thermal manikin with a step change in RH (from 45% to 80%). During the transient change in RH, a new evaluation and correction method was modeled to correct the heat loss from different segments of the manikin body. As a result of the heat of sorption, hygroscopic fibers may create exothermic heat, which manifested as a peak during the dynamic shift in the surrounding RH. The investigation was further expanded further to include sweating manikin experiments during a step change in the body metabolic rate (rest-activity-dry) in a controlled environment (temperature 15°C, 50% RH, 1 m/s wind). The purpose of these experiments was to get a more detailed understanding of physiological traits such as mean skin temperature, microclimate temperature, and humidity, and fabric surface temperature. The findings demonstrated that wool fiber had the ability to maintain a thermal environment more effectively than the other fiber types, thus retaining a warmer microclimate. When the mean skin temperature drops after exercise, a warmer microclimate can act as a buffer against post-exercise chill. Human trials confirmed the validity of the findings.The subjective trial was conducted with 12 male participants, with five different outfits in a controlled climate chamber of temperature 15°C, 50% RH and 1.7 m/s wind speed. The test protocol was designed to have a continuous process of (rest-activity drying). The human trial showed statistically significant thermal comfort for wool fiber, while polyester was the most uncomfortable for temperature sensation during the post-exercise period.A novel fabric test method that can simulate changing conditions in a single step was developed by compiling all data from fabric testing, manikin tests, and human trials. This method used a custom-made hot plate to define the exothermic behavior of a fabric and its functionality under changing environmental conditions. The newly developed test procedure can aid sportswear manufacturers in designing clothing that is more conducive to the wearer's comfort while rock climbing, cycling, and exercising under windy atmospheric circumstances. In addition, the use of this test method could contribute to the definition of a new comfort term relating to rapidly changing environmental conditions called "dynamic breathability.".

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379472535Subjects--Topical Terms:

659605
Textile fibers.
Index Terms--Genre/Form:

542853
Electronic books.

Dynamic Breathability : = Mapping the Gaps Between Static and Dynamic Benefits of Fabric.
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500 $a Advisor: Lavoine, Nathalie; Ford, Ericka; Ormond, Bryan; DenHartog, Emiel.
502 $a Thesis (Ph.D.)--North Carolina State University, 2023.
504 $a Includes bibliographical references
520 $a High-regain fibers have been shown to have exothermic effects, although there have not been reliable tests to demonstrate these effects on the human body. The ISO 16533 standard test method for determining the exothermic and endothermic behavior of textiles under changing relative humidity (RH) conditions (from 10% to 90%) can only demonstrate the increase in temperature, yet has a number of limitations for sample size, test environments, and test set up. This investigation seeks to understand the relationship between the exothermic and endothermic behavior of textile fibers (wool, cotton, viscose, and polyester) while absorbing moisture and its effect on physiological factors by developing a new fabric test method to characterize the fabric's behavior in transient conditions.Firstly, all the reliable fabric test methodologies were explored to determine this exothermic behavior. The test includes standard, and dynamic regain tests, ISO 16533, and dynamic hot plate tests. Comparing the test methods allowed us to properly identify the limitations of those methods, which allowed us to consider more practical test protocols for garment testing with manikin and human trials.The exothermic behavior of the fabrics was investigated using a thermal manikin with a step change in RH (from 45% to 80%). During the transient change in RH, a new evaluation and correction method was modeled to correct the heat loss from different segments of the manikin body. As a result of the heat of sorption, hygroscopic fibers may create exothermic heat, which manifested as a peak during the dynamic shift in the surrounding RH. The investigation was further expanded further to include sweating manikin experiments during a step change in the body metabolic rate (rest-activity-dry) in a controlled environment (temperature 15°C, 50% RH, 1 m/s wind). The purpose of these experiments was to get a more detailed understanding of physiological traits such as mean skin temperature, microclimate temperature, and humidity, and fabric surface temperature. The findings demonstrated that wool fiber had the ability to maintain a thermal environment more effectively than the other fiber types, thus retaining a warmer microclimate. When the mean skin temperature drops after exercise, a warmer microclimate can act as a buffer against post-exercise chill. Human trials confirmed the validity of the findings.The subjective trial was conducted with 12 male participants, with five different outfits in a controlled climate chamber of temperature 15°C, 50% RH and 1.7 m/s wind speed. The test protocol was designed to have a continuous process of (rest-activity drying). The human trial showed statistically significant thermal comfort for wool fiber, while polyester was the most uncomfortable for temperature sensation during the post-exercise period.A novel fabric test method that can simulate changing conditions in a single step was developed by compiling all data from fabric testing, manikin tests, and human trials. This method used a custom-made hot plate to define the exothermic behavior of a fabric and its functionality under changing environmental conditions. The newly developed test procedure can aid sportswear manufacturers in designing clothing that is more conducive to the wearer's comfort while rock climbing, cycling, and exercising under windy atmospheric circumstances. In addition, the use of this test method could contribute to the definition of a new comfort term relating to rapidly changing environmental conditions called "dynamic breathability.".
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
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650 4 $a Humidity. $3 3559498
650 4 $a Cotton. $3 865960
650 4 $a Microclimate. $3 3686558
650 4 $a Heat. $3 573595
650 4 $a Skin. $3 843661
650 4 $a Textile research. $3 2153103
650 4 $a Research & development--R&D. $3 3554335
650 4 $a Wool. $3 3591800
650 4 $a Sensors. $3 3549539
650 4 $a Body temperature. $3 916233
650 4 $a Physical properties. $3 3564184
650 4 $a Agronomy. $3 2122783
650 4 $a Atmospheric sciences. $3 3168354
650 4 $a Fashion. $3 549143
650 4 $a Physiology. $3 518431
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0994
690 $a 0285
690 $a 0725
690 $a 0200
690 $a 0719
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a North Carolina State University. $3 1018772
773 0 $t Dissertations Abstracts International $g 84-11A.
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