Effects of Clothing Ventilative Designs on Thermal Insulation under Varying Wind Conditions

2011 ◽  
Vol 332-334 ◽  
pp. 1927-1930 ◽  
Author(s):  
Xiang Hui Zhang ◽  
Jun Li
Keyword(s):  
Experimental Investigation ◽  
Thermal Comfort ◽  
Thermal Insulation ◽  
The Body ◽  
Thermal Manikin ◽  
Clothing Insulation ◽  
Vertical Side ◽  
Wind Velocities ◽  
Heat And Moisture ◽  
Body Heat

This paper reports on an experimental investigation of the effects of clothing ventilative designs on thermal comfort measured in terms of thermal insulation. Eight T-shirts with varying areas and locations of mesh fabric were designed and produced for testing on a dry thermal manikin. Clothing thermal insulation of T-shirts was measured under three wind velocities: 0.5, 1 and 2m/s. The results showed that, the areas and locations of ventilation panels affect the total thermal insulation. The T-shirts with larger area of mesh fabric are preferable in terms of releasing more body heat. Among various designs tested, mesh fabrics applied at two vertical side seams can most effectively release heat and moisture from the body. Clothing insulation is also greatly affected by wind.

Impact of electrical heating on effective thermal Insulation of a multi-layered winter clothing system for optimal heating efficiency

2016 ◽  
Vol 28 (2) ◽  
Author(s):  
Huiju Park ◽  
Soo-kyung Hwang ◽  
Joo-Young Lee ◽  
Jintu Fan ◽  
Youngjin Jeong
Keyword(s):  
Ambient Temperature ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Electric Heating ◽  
The Body ◽  
Electrical Heating ◽  
Thermal Manikin ◽  
Heating Unit ◽  
Heating Efficiency ◽  
Body Heat

Purpose This paper investigated the impact of the distance of the heating unit from the body in a multi-layered winter clothing system on effective thermal insulation and heating efficiency. Design/methodology/approach To identify changes in the thermal insulation and heating efficiency of electrical heating in different layers inside a winter clothing ensemble, a series of thermal manikin tests was conducted. A multi-layered winter ensemble with and without activation of a heating unit was tested on the thermal manikin under two different ambient temperature conditions (10°C and -5°C). Findings Results show that the effective thermal insulation of test ensembles increased by 5-7% with the activation of the heating unit compared to that without the activation. The closer the heating unit to the body, the higher the effective thermal insulation was in both ambient temperature conditions. This trend was more significant at lower ambient temperature. Research limitations/implications The results of this study indicate that providing electric heating next to the skin is the most effective in increasing effective thermal insulation and decreasing body heat loss in both ambient temperature (-5°C and 10°C). This trend was more remarkable in colder environment at -5°C of ambient temperature as evidenced by sharp decrease in heating efficiency and effective thermal insulation with an increase in distance between the manikin skin and heating unit at -5°C of ambient temperature compared to at 10°C of ambient temperature. Practical implications Based on the results, it is expected that proximity heating next to the skin, in cold environment, may reduce the weight and size of the battery for the heating unit because of the higher efficiency of electric heating and the potentially immediate perception of warmth supported by the greatest increase in effective thermal insulation, as well as the lowest heat loss that comes with activation of heating on the first layer in cold environment. Originality/value The finding of this study provides guidelines to sportswear designers, textile scientists, sports enthusiasts, and civilians who consider electric heating benefits for improved thermal comfort and safety in cold environments, especially in the areas of outdoor and winter sports and in military service. The results of this study indicate that providing electric heating next to the skin is the most effective in increasing effective thermal insulation and decreasing body heat loss in both ambient temperature (-5°C and 10°C).

Far IR Emission and Thermal Properties of Ceramics Coated Fabrics by IR Thermography

2006 ◽  
Vol 321-323 ◽  
pp. 849-852 ◽  
Author(s):  
Chung Hee Park ◽  
Myoung Hee Shim ◽  
Huen Sup Shim
Keyword(s):  
Far Infrared ◽  
The Body ◽  
Thermal Manikin ◽  
Evaporative Resistance ◽  
Clothing Insulation ◽  
Ir Camera ◽  
Warm Up ◽  
Coated Fabrics ◽  
Ir Emission ◽  
Body Heat

The purpose of this study was to develop the warm-up suit that is comfortable as well as has good thermal performance. The function of warm-up suit is to keep the body warm and thus to lose it’s weight by sweating. Ceramic powders, such as zirconium and magnesium oxide have been incorporated into the textile structures to utilize the far infrared radiation effect of ceramics, which heat substrates homogeneously by activating molecular motion. Thermal manikin tests were conducted to determine the clothing insulation and evaporative resistance of the selected warm-up suits. Also, the far IR emission effects of ceramics containing laminate on the body heat transfer were evaluated with the thermogram data using IR camera. The results showed that the ceramics inside laminate slightly increased the thermal insulation and the evaporative resistance. Thermogram showed that when the fabric was heated with the thermal manikin, surface mean temperatures of fabrics were increased as the ceramic incorporated, and the heat storage performance was confirmed.

Comparison of clothing thermal comfort properties measured on female and male sweating manikins

2016 ◽  
Vol 87 (18) ◽  
pp. 2214-2223 ◽  
Author(s):  
Chao Sun ◽  
Jintu Fan
Keyword(s):  
Thermal Comfort ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Female Body ◽  
Body Shape ◽  
The Body ◽  
Thermal Manikin ◽  
Unit Surface Area ◽  
Evaporative Resistance ◽  
Evaporative Water

Thermal manikins simulating human body’s thermal regulatory system are essential tools for understanding the heat exchange between human body and the environment and also for evaluating the thermal comfort of clothing and near environment. However, most existing thermal manikins adopt a male’s body shape and no sweating female thermal manikin has been reported so far. Furthermore, it is unclear how body shape (viz. male vs female) affects the heat loss and perspiration from the body. We report on a novel female sweating thermal manikin “Wenda”. Thermal properties of the nude body and clothing ensembles measured on “Wenda” are compared with those measured on the male manikin “Walter”. It was found that, although the more curvaceous female body reduces the thermal insulation of the nude manikin, it increases the apparent evaporative resistance at the same time. This may be due to the fact that the more curvaceous female body increases the surface still air layer to add resistance to heat loss by conduction and evaporative water loss by diffusion, and significantly increases the percentage of effective radiative area and the resultant radiative heat loss per unit surface area. It was further shown that clothing thermal insulation and apparent evaporative resistance measured on Wenda are typically 0 ∼ 11% higher than those measured on the male sweating fabric manikin-Walter, probably due to the greater clothing microclimate volume on the female manikin resulting from the looser fitting of the garments on the smaller female body and the more curvaceous surface of the female body.

scholarly journals 4788 Thermal Manikin Measurements of Protective Clothing Assemblies

2018 ◽  
Vol 26 (1(127)) ◽  
pp. 200-209 ◽  
Author(s):  
Iwona Frydrych ◽  
Iwona Frydrych ◽  
Agnieszka Cichocka ◽  
Paulina Gilewicz ◽  
Justyna Dominiak
Keyword(s):  
Thermal Comfort ◽  
Thermal Insulation ◽  
Protective Clothing ◽  
The Body ◽  
Thermal Manikin ◽  
Dynamic Conditions ◽  
Comparison Of Results ◽  
Number Of Layers ◽  
Foundry Worker

The thermal comfort of a foundry worker is very important and related to many factors, i.e., the structure of the protective clothing assembly, the number of layers and their thickness, as well as the distance between the body and appropriate underwear. The research undertaken aimed at checking thermal insulation for assemblies consisting of aluminized protective clothing and appropriate underwear in two sizes and without underwear. Measurements of the clothing thermal insulation were conducted using a thermal manikin dressed in two-layer protective clothing and three kinds of underwear products covering the upper and lower parts of the manikin. The first part of the paper presents a comparison of results of thermal insulation measurement of two kinds of protective clothing: a traditional one made of aluminised glass fabrics and a new one made of aluminised basalt fabrics. Each of the protective clothing was worn on three kinds of underwear products in m and s sizes. The influence of the underwear size was noted. In the second part of paper, measurements were made for two aluminized basalt clothing variants: commercial and a prototype with modifications in static and dynamic conditions. The results were discussed.

scholarly journals Genetic Algorithm Applied to Multi-Criteria Selection of Thermal Insulation on Industrial Shed Roof

Buildings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 238 ◽  
Author(s):  
Stamoulis ◽  
Santos ◽  
Lenz ◽  
Tusset
Keyword(s):  
Genetic Algorithm ◽  
Thermal Comfort ◽  
Thermal Insulation ◽  
Optimization Technique ◽  
Building Envelope ◽  
Expanded Polystyrene ◽  
Insulation Material ◽  
Clothing Insulation ◽  
Climate Conditions ◽  
Selection Of

The rational use of energy has motivated research on improving the energy efficiency of buildings, which are responsible for a large share of world consumption. A strategy to achieve this goal is the application of optimized thermal insulation on a building envelope to avoid thermal exchanges with the external environment, reducing the use of heating, ventilation and air-conditioning (HVAC) systems. In order to contribute to the best choice of insulation applied to an industrial shed roof, this study aims to provide an optimization tool to assist this process. Beyond the thermal comfort and cost of the insulation, some hygrothermic properties also have been analysed to obtain the best insulation option. To implement this optimization technique, several thermo-energetic simulations of an industrial shed were performed using the Domus software, applying 4 types of insulation material (polyurethane, expanded polystyrene, rockwool and glass wool) on the roof. Ten thicknesses ranging from 0.5 cm to 5 cm were considered, with the purpose of obtaining different thermal comfort indexes (PPD, predicted percentage dissatisfied). Posteriorly, the best insulation ranking has been obtained from the weights assigned to the parameters in the objective function, using the technique of the genetic algorithm (GA) applied to multi-criteria selection. The optimization results showed that polyurethane (PU) insulation, applied with a thickness of 1 cm was the best option for the roof, considering the building functional parameters, occupant metabolic activity, clothing insulation and climate conditions. On the other hand, when the Brazilian standard was utilized, rock wool (2 cm) was considered the best choice.

PROVIDING THERMAL COMFORT OF THE DISTAL SEGMENTS OF THE LOWER LIMBS BY USING AN AUTONOMOUS ELECTRIC HEATING SYSTEM

2021 ◽  
Author(s):  
I.S. Malakhova ◽  
◽  
T.K. Losik ◽  
O.V. Burmistrova
Keyword(s):  
Thermal Comfort ◽  
Thermal Insulation ◽  
Low Temperatures ◽  
Electric Heating ◽  
Heating System ◽  
The Body ◽  
Climatic Zone ◽  
Experimental Sample ◽  
Local Cooling ◽  
Additional Heat

Abstract. Introduction. Work in low temperatures can lead to both general and local cooling of the human body. Local cooling of the distal parts of the legs can limit the motor activity of the employee even with sufficient thermal insulation of the body general surface. Therefore, the use of an additional heat source in special shoes (autonomous electric heating system (AEHS)) can compensate heat losses in the distal parts of the legs and provide thermal comfort in conditions of low temperatures throughout the work. The purpose of the study: physiological and hygienic assessment of the additional heat sources (AEHS) influence on the thermal insulation of special shoes in conditions of low temperatures. Materials and methods. To assess the heat-protective properties of the special shoes experimental sample with an AEHS, a heat flux density and skin temperature meter ITP-MG 4.03/30 "POTOK" (LLC SKB Stroypribor, Chelyabinsk) was used. The presented sample was tested with the participation of 5 volunteers in three modes of autonomous electric heating in a microclimatic chamber for 60 minutes for each mode separately. The average air temperature in the chamber during the study was 2.5±0.5 °C. Based on the obtained data, the thermal insulation of special shoes with an AEHS was calculated. Results. The thermal insulation of the special shoes experimental sample without electric heating was 0.460±0.013 °C m2/W; and 0.512±0.01 and 0.549±0.01 °C m2/W using the minimum and medium electric heating modes-, respectively, which allows us to recommend the presented sample of special shoes with an autonomous electric heating system for work in a "Special" climatic zone when performing moderate-severity work. The thermal insulation of a special shoes sample with the maximum electric heating mode was 0.615±0.01 °C m2/W, which makes it possible to work with it in the IV climatic zone. Conclusions. The use of an AEHS increases the thermal insulation of special shoes, which provides sufficient protection for the distal parts of the legs, allows to expand the scope of its operation in strict compliance with the work and rest regime and can be a prevention of the occupational diseases development in workers at low temperatures.

A review of noteworthy/major innovations in wearable clothing for thermal and moisture management from material to fabric structure

2021 ◽  
pp. 004051752110277
Author(s):  
Hafiz Muhammad Kaleem Ullah ◽  
Joseph Lejeune ◽  
Aurélie Cayla ◽  
Mélanie Monceaux ◽  
Christine Campagne ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
The Body ◽  
Innovative Strategies ◽  
Individual Level ◽  
Thermal Range ◽  
Moisture Management ◽  
Wide Range ◽  
The Individual ◽  
Air Conditioning Systems ◽  
Body Heat

The human body exchanges heat through the environment by various means, such as radiation, evaporation, conduction, and convection. Thermo-physiological comfort is associated with the effective heat transfer between the body and the atmosphere, maintaining the body temperature in a tolerable thermal range (36.5–37.5ºC). In order to ensure comfort, the body heat must be preserved or emitted, depending on external conditions. If the body heat is not properly managed, it can cause hyperthermia, heatstroke, and thermal discomfort. Conventionally, heating, ventilation, and air conditioning systems are used to provide comfort. However, they require a huge amount of energy, leading to an increase in global warming, and are limited to indoor applications. In recent decades, scientists across the world have been working to provide thermal comfort through wearable innovative textiles. This review article presents recent innovative strategies for moisture and/or thermal management at the material, filament/fiber, yarn, and fabric scales. It also summarizes the passive/active textile models for comfort. Integrating electrical devices in garments can rapidly control the skin temperature, and is dynamic and useful for a wide range of environmental conditions. However, their use can be limited in some situations due to their bulky design and batteries, which must be frequently recharged. Furthermore, adaptive textiles enable the wearer to maintain comfort in various temperatures and humidity without requiring batteries. Using these wearable textiles is convenient to provide thermal comfort at the individual level rather than controlling the entire building temperature.

Simulating Human Physiological Response with a Thermal Manikin Testing Different Non Active Medical Devices

2010 ◽  
Vol 636-637 ◽  
pp. 36-40 ◽  
Author(s):  
Iara Braga ◽  
M. José Abreu ◽  
F.M. Duarte
Keyword(s):  
Medical Device ◽  
Thermal Insulation ◽  
Thermal Environment ◽  
Objective Evaluation ◽  
Thermal Manikin ◽  
Clothing Insulation ◽  
Temperature Development ◽  
Surgical Gown ◽  
Surgical Gowns ◽  
Selection Of

The thermal insulation of a clothing system represents a quantitative assessment of the way cloth provides thermal barrier to the user. One of this clothing systems, the surgical gown used in the operating theatre, is considered as a non-active medical device and obeys the Medical Device Directive 93/43/EEC. New materials and gowns are being developed, fitting the level of the barrier function with the comfort issues and therefore the selection of the most suitable gown is vital. During the last 60 years, thermal manikins have been used to measure clothing insulation and to assess the thermal environment regarding comfort issues. The main goal of the present study is the comparison of the thermal insulation values during the objective evaluation using the dry thermal manikin with the results obtained using an Infra-Red camera ThermaCAM, monitoring the temperature development of different surgical gowns at a constant skin temperature of 33 °C in neutral environmental conditions.

Effects of hip protective clothing on thermal wear comfort of clothing ensembles

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wiah Wardiningsih ◽  
Olga Troynikov
Keyword(s):  
Thermal Comfort ◽  
Thermal Insulation ◽  
Protective Clothing ◽  
Thermal Manikin ◽  
Content Type ◽  
Wear Comfort ◽  
Ensemble Performance ◽  
Clothing Style ◽  
Thermal Wear ◽  
Moisture Vapour

Purpose This paper aims to examine the influence of hip protective clothing on ensemble performance attributes related to thermal comfort. It also explores the effect on protective pads of various materials and the arrangements of material. The thermal comfort characteristics are thermal insulation and moisture vapour resistance. Design/methodology/approach For this research, four ensembles of clothing were used: one ensemble without hip protective clothing and three ensembles with hip protective clothing. A thermal manikin was used to test the thermal insulation and moisture vapour resistance of the ensembles. Findings The findings revealed that incorporating hip protective clothing into the clothing ensembles influenced the thermal resistance and moisture vapour resistance of the ensemble. In the “all zones group,” the influence of the hip protective clothing depended on clothing style, with hipster-style clothing producing insignificant changes. In the “hip zones group” and “stomach and hip zones group,” hip protective clothing strongly influenced the thermal comfort attributes of ensembles. Pad material and volume play important roles in these changes in thermal comfort attributes. Originality/value These outcomes are useful for the design and engineering of hip protective clothing, where maximizing protection while minimizing thermal and moisture vapour resistance is critical for wear comfort and adherence in warm or hot conditions. The designer should consider that material, volume and thickness of protective pad affect the overall thermal comfort attributes of the hip protective clothing.

Effects of athletic T-shirt designs on natural ventilation

2016 ◽  
Vol 20 (2) ◽  
pp. 112-123 ◽  
Author(s):  
Chupo Ho ◽  
Jintu Fan ◽  
Edward Newton ◽  
Raymond Au
Keyword(s):  
Thermal Insulation ◽  
Moisture Transfer ◽  
Design Method ◽  
Air Gap ◽  
Thermal Manikin ◽  
Heat And Moisture Transfer ◽  
Content Type ◽  
Heat And Moisture ◽  
Air Circulation ◽  
Moisture Vapour

Purpose Maintaining air circulation between the wearer and garment layer is crucial for activating heat and moisture transfer from the body. If an air gap is trapped, air circulation may become ineffective and the ventilation of the garment is, thus, hindered. To maintain and extend the air gap, this study aims to propose a design method that involves placing spacer blocks underneath the garment to prevent the fabric from clinging directly to the skin. Design/methodology/approach To study the application of this design method, a series of T-shirts were produced and tested using a thermal manikin in standing and walking postures. All the T-shirts were made of fabric ostensibly manufactured to have high air permeability. Porous mesh fabric was used to construct the vented panels on the T-shirts. The test was conducted in a chamber with controlled temperature, relative humidity and wind velocity. Total thermal insulation (Rt) and moisture vapour resistance (Ret) were measured. Findings The test results showed that extension of the air gap between wearer and fabric provided higher ventilation to the wearer if the vented panels were also present on the T-shirts. Different placements of the vented panels on the T-shirts also affected the heat and moisture transfer from the thermal manikin. Research limitations/implications Due to limited resources, the evaluation of total thermal insulation and moisture vapour resistance was based on the testing result from a thermal manikin instead of any subjective wearer trial. Practical implications This research can contribute to the clothing designer who is developing function wear for a better ventilation. Social implications This research can contribute to the clothing designer who is developing function wear for a better ventilation. Originality/value This study aimed to further develop a new design concept in T-shirt design by improving the construction of the spacer blocks. Fabric with higher air and water vapour permeability was used to determine to what extent this design method is applicable to higher performance on heat and moisture transfer.

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