Effects of wind direction on sportswear thermal insulation with various ease allowance

2016 ◽  
Vol 28 (4) ◽  
pp. 492-502 ◽  
Author(s):  
Shurong Hu ◽  
Mengmeng Zhao ◽  
Jun Li
Keyword(s):  
Surface Temperature ◽  
Thermal Comfort ◽  
Thermal Insulation ◽  
Wind Direction ◽  
Future Research ◽  
Thermal Manikin ◽  
Thermal Imager ◽  
Content Type ◽  
The Difference ◽  
Ease Allowance

Purpose – The purpose of this paper is to explore the effects of wind direction and ease allowance on thermal comfort in sportswear. Design/methodology/approach – The effects of wind direction (front, side, back and calm (no wind) 1.5 m/s) and seven magnitudes of ease allowance on sportswear thermal insulation and surface temperature were investigated. An 11 zones’ thermal manikin was used to acquire the static thermal insulation. Surface temperature was captured by a thermal imager. Findings – The results showed that the wind was a significant effect on thermal performance, however, wind direction effect was only significant in the segment covered with multilayer fabric, such as the abdomen and hip (p=0.034). Although the ease allowance influenced the overall thermal insulation obviously, the difference between seven sizes suits was not significant. Nevertheless, the ease allowance affected the surface temperature of chest and back significantly (p=0.023, 0.007). Correlation between thermal insulation and surface temperature was negative, and correlation level was degraded when affected by wind factor. Research limitations/implications – Sportswear’s fabric and style did not discussed as effect factors. It would be taken into accounted in the future research. Originality/value – Wind direction impact thermal comfort in multilayer regions significantly. It is a reference to improve sportswear’s comfort design.

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.

Investigation on thermal comfort of the uniform for workers in tropical monsoon climates

2020 ◽  
Vol 32 (6) ◽  
pp. 849-868
Author(s):  
Jingxian Xu ◽  
Huijuan Liu ◽  
Yunyi Wang ◽  
Jun Li
Keyword(s):  
Heat Transfer ◽  
Thermal Comfort ◽  
Dynamic Condition ◽  
Thermal Manikin ◽  
Content Type ◽  
Wind Speeds ◽  
Subjective Perceptions ◽  
Tropical Monsoon ◽  
Four Levels ◽  
Thermal Insulations

PurposeThis study aims to investigate the heat transfer mechanism of the uniforms used by people working in hot, humid and windy environments. Furthermore, the effectiveness of an opening structure added to the armpit of the uniforms in improving thermal comfort was comparatively examined.Design/methodology/approachA set of uniforms was tested with the opening at the armpit alternatively zipped or unzipped. Thermal manikin and human tests were performed in a climatic chamber simulating the specific environmental conditions, including wind speeds at four levels (0.15, 0.5, 2, 4 m/s) and relative humidities at two levels (50 and 85%). Static and dynamic thermal insulations of clothing (IT) were examined by the thermal manikin tests. The human bodies' thermal responses, including heart rates (HR), eardrum temperatures (Te), skin temperatures (Tsk) and subjective perceptions, were given by the human tests.FindingsSpecial mechanisms of heat transfer in the specific uniforms used in tropical monsoon climates were revealed. Reductions on IT were caused by the movement of the human body and the environmental wind, and the empirical equations would underestimate this reduction. The opening at the armpit was able to prompt more heat transfer under dynamic condition, with reducing the IT by 11.8%, lowering the mean Tsk by 0.92°C, and significantly improving the subjective perceptions (p < 0.05). The heat exhaustion was alleviated with lowering the Te by 0.32°C.Originality/valueThis study managed to improve the thermal performance of uniforms for workers under unforgiving conditions. The evaluation and design methods introduced by this study provided practical guidance for similar products with strict dress codes and cost control requirements based on the findings from thorough product tests and analysis.

scholarly journals EFFECT OF WIND VELOCITY AND WIND DIRECTION ON THERMAL INSULATION VALUES OF CLOTHING ENSEMBLES BY USING THERMAL MANIKIN

2007 ◽  
Vol 72 (621) ◽  
pp. 23-28 ◽  
Author(s):  
Shinichi WATANABE ◽  
Tetsumi HORIKOSHI ◽  
Tomoya KANEKO ◽  
Yuji UNO ◽  
Jin ISHII ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Thermal Insulation ◽  
Wind Direction ◽  
Thermal Manikin

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.

scholarly journals Evaluative application of UKCP09‐based downscaled future weather years to simulate overheating risk in typical English homes

2013 ◽  
Vol 31 (4) ◽  
pp. 231-252 ◽  
Author(s):  
Rajat Gupta ◽  
Matthew Gregg ◽  
Hu Du ◽  
Katie Williams
Keyword(s):  
Climate Change ◽  
Simulation Modelling ◽  
Simulation Software ◽  
Building Simulation ◽  
Future Research ◽  
Climate Projections ◽  
Data Sets ◽  
Data Set ◽  
Content Type ◽  
The Difference

PurposeTo critically compare three future weather year (FWY) downscaling approaches, based on the 2009 UK Climate Projections, used for climate change impact and adaptation analysis in building simulation software.Design/methodology/approachThe validity of these FWYs is assessed through dynamic building simulation modelling to project future overheating risk in typical English homes in 2050s and 2080s.FindingsThe modelling results show that the variation in overheating projections is far too significant to consider the tested FWY data sets equally suitable for the task.Research and practical implicationsIt is recommended that future research should consider harmonisation of the downscaling approaches so as to generate a unified data set of FWYs to be used for a given location and climate projection. If FWY are to be used in practice, live projects will need viable and reliable FWY on which to base their adaptation decisions. The difference between the data sets tested could potentially lead to different adaptation priorities specifically with regard to time series and adaptation phasing through the life of a building.Originality/valueThe paper investigates the different results derived from FWY application to building simulation. The outcome and implications are important considerations for research and practice involved in FWY data use in building simulation intended for climate change adaptation modelling.

scholarly journals Measuring the effects of heated windows on thermal comfort

2021 ◽  
Author(s):  
Balázs Cakó ◽  
Dalma Lovig ◽  
András Ózdi
Keyword(s):  
Surface Temperature ◽  
Thermal Comfort ◽  
Window Glass ◽  
Measuring Instruments ◽  
Thermal Manikin ◽  
Research Project ◽  
Predicted Mean Vote ◽  
Set Up ◽  
Comfort Parameters ◽  
Comfort Indices

AbstractDuring the following research project, the effects of an electrically heated window on the thermal comfort parameters of permanently occupied spaces were examined. A thermal manikin and a Testo 400 comfort-meter were used for the tests. To characterize the space, the predicted mean vote and predicted percentage of dis-satisfied method was applied. The examination of the comfort indices took place in the vicinity of an electrically heated window glass. During the measurements the surface temperature of the glazing was changed, alongside the distance from the glazing at which the measuring instruments were set up. The project aimed to assess the results measured by the thermal manikin and assess the usability of heated window glazing, taking thermal comfort into account.

Financial integration and diversification benefits: China and ASEAN4 countries

2016 ◽  
Vol 42 (5) ◽  
pp. 496-514 ◽  
Author(s):  
Tung Dao Nguyen ◽  
Pana Elisabeta
Keyword(s):  
Financial Integration ◽  
Equity Markets ◽  
Investment Strategy ◽  
Moderate Level ◽  
Strategic Partnership ◽  
Future Research ◽  
Financial Contagion ◽  
Content Type ◽  
Cross Country ◽  
The Difference

Purpose – The strategic partnership between China and ASEAN has resulted in significant financial reforms at the country and regional level. The scale and pace of these changes call for systematic assessments of their bearing on the development and integration of financial markets in this region. The purpose of this paper is to investigate the level of financial integration of the equity markets in China and ASEAN4 countries (Indonesia, Malaysia, Philippines, and Thailand) for the period 2004-2014. Design/methodology/approach – The authors use the β and σ convergence, dynamic conditional correlation, and wavelet correlation to assess the degree, trend, and change across different time scales of the integration of China-ASEAN4 equity markets. Using two measures of change in return per unit risk and variance, we assess the difference in diversification benefits between an equity portfolio China-ASEAN4 and China-EU. Findings – The authors find that financial integration across China-ASEAN4 equity markets fluctuated between a moderate level before and after the recent crisis and a higher level during the crisis. The results indicate that investors achieve higher diversification benefits from a cross-industry than a cross-country investment strategy within this region. Research limitations/implications – Future research should investigate whether local factors and existing cultural and political differences explain the weak to moderate level of integration of China and emerging ASEAN equity markets. Practical implications – A good understanding of the degree and evolution of the regional financial integration may be used by investors to allocate capital efficiently when adding ASEAN4 equities to a portfolio of Chinese equities. Social implications – Systematic assessments of the regional financial integration contribute to the effort to mitigate the ensuing cross-border financial contagion during crises. Originality/value – The authors argue that that the increase in correlations of CHINA-ASEAN4 equity markets during the recent crisis does not reflect a permanent shift in the dynamic of the dominant markets in the region. While investors achieve higher diversification benefits from a cross-industry than a cross-country investment strategy within this region, the diversification benefits are lower for long-term than short-term investors.

Artificial neural networks for prediction of local thermal insulation of clothing protecting against cold

2018 ◽  
Vol 30 (1) ◽  
pp. 82-100
Author(s):  
Anna Katarzyna Dabrowska
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Thermal Insulation ◽  
Thermal Manikin ◽  
Content Type ◽  
Artificial Neural ◽  
Local Thermal Insulation ◽  
High Level ◽  
Hands And Feet ◽  
The Impact

Purpose The purpose of this paper is to develop artificial neural networks (ANNs) allowing us to simulate the local thermal insulation of clothing protecting against cold on a basis of the characteristics of materials and design solutions used. Design/methodology/approach For this purpose, laboratory tests of thermal insulation of clothing protecting against cold as well as thermal resistance of textile systems used in the clothing were performed. These tests were conducted with a use of thermal manikin and so-called skin model, respectively. On a basis of results gathered, 12 ANNs were developed that correspond to each thermal manikin’s segment besides hands and feet which are not covered by protective clothing. Findings In order to obtain high level of simulations, optimization measures for the developed ANNs were introduced. Finally, conducted validation indicated a very high correlation (above 0.95) between theoretical and experimental results, as well as a low error of the simulations (max 8 percent). Originality/value The literature reports addressing the problem of modeling thermal insulation of clothing focus mainly on the impact of the degree of fit and the velocity of air movement on thermal insulation properties, whereas reports dedicated to modeling the impact of the construction of clothing protecting against cold as well as of diverse material systems used within one design of clothing on its thermal insulation are scarce.

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.

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