Human body exergy analysis model in building thermal comfort evaluation

Nowadays, thermal comfort became one of the criteria in choosing a vehicle. In last decades time spent by people in vehicles had risen substantially. During each trip, thermal comfort must to be ensured for a good psychological and physical state of the passengers. Also, a comfortable environment leads to a higher power concentration of the driver thereby to a safe trip for vehicle occupants and for all traffic participants. The present study numerically investigated the effect of human body sited in the driver's place, over the air velocity distribution and over the thermal comfort in a passenger compartment. CFD simulations were made with different angles of the left inlet grill, in both cases, with and without driver presence. In majority of the actual vehicles environment studies, are made without consideration of human body geometry, in this case, the results precision can be affected. The results show that the presence of human body, lead to global changing of the whole flow pattern inside the vehicular cabin. Also, the locations of the maximum velocities are changing with the angle of the guiding vanes. The thermal comfort PMV/PPD indexes were calculated for each case. The presence of human body leads to a more comfortable environment.

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Assessing the Influence of Convective Heat Transfer Coefficient on a Human Body Exergy Analysis

10.26678/abcm.cobem2019.cob2019-0697 ◽

2019 ◽

Author(s):

Thatiana Jéssica da Silva Ribeiro ◽

Carlos Eduardo Keutenedjian Mady

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Transfer Coefficient ◽

Convective Heat Transfer ◽

Convective Heat ◽

Human Body ◽

Exergy Analysis ◽

Convective Heat Transfer Coefficient

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Evaluation of compression-recovery and thermal characteristics of multilayer bedding textiles

International Journal of Clothing Science and Technology ◽

10.1108/ijcst-04-2019-0054 ◽

2020 ◽

Vol 32 (5) ◽

pp. 631-643

Author(s):

Sedat Özer ◽

Yaşar Erayman Yüksel ◽

Yasemin Korkmaz

Keyword(s):

Thermal Conductivity ◽

Sleep Quality ◽

Thermal Comfort ◽

Sleep Duration ◽

Human Body ◽

Design Methodology ◽

Thermal Characteristics ◽

Air Permeability ◽

Content Type ◽

Thermal Comfort Properties

PurposeDesign of bedding textiles that contact the human body affects the sleep quality. Bedding textiles contribute to comfort sense during the sleep duration, in addition to ambient and bed microclimate. The purpose of this study is to evaluate the effects of different layer properties on the compression recovery and thermal characteristics of multilayer bedding textiles.Design/methodology/approachIn this study, woven and knitted multilayer bedding textiles were manufactured from fabric, fiber, sponge and interlining, respectively. Different sponge thickness, fiber and interlining weight were used in the layers of samples. Later, the pilling resistance, compression and recovery, air permeability and thermal conductivity of multilayer bedding textiles were investigated.FindingsThe results indicated that samples with the higher layer weight and thickness provide better compression recovery and lower air permeability properties. It was also found that knitted surfaces show the higher air permeability than the woven surfaces depending on the fabric porosity. Layer properties have insignificant effect on the thermal conductivity values.Originality/valueWhile researchers mostly focus on thermal comfort properties of garments, there are limited studies about comfort properties of bedding textiles in the literature. Furthermore, compression recovery properties of bedding textiles have also a great importance in terms of comfort. Originality of this study is that these properties were analyzed together.

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Analysis of EEG, Cardiac Activity Status, and Thermal Comfort According to the Type of Cooling Seat during Rest in Indoor Temperature

Applied Sciences ◽

10.3390/app11010097 ◽

2020 ◽

Vol 11 (1) ◽

pp. 97

Author(s):

Yunchan Shin ◽

Minjung Lee ◽

Honghyun Cho

Keyword(s):

Thermal Comfort ◽

Human Body ◽

Cold Water ◽

Cardiac Activity ◽

Satisfaction Level ◽

Water Cooling ◽

Indoor Temperature ◽

Sensorimotor Rhythm ◽

Electroencephalogram Eeg ◽

Wave Reduction

In this study, electroencephalogram (EEG) and cardiac activity status of the human body while using various types of seats during rest were analyzed in indoor summer conditions. Thermal comfort was also evaluated through a subjective survey. The EEG, cardiac activity status, and subjective survey during rest indicated that the use of ventilation and cold water-cooling seats was effective. This effectiveness was because of the θ-wave and α-wave activation, sensorimotor rhythm, β-wave reduction, and left hemisphere activation, demonstrating that the conditions applied were suitable for rest. According to the analysis of the subjective questionnaire survey, the use of ventilation and cold water-cooling seats provided a more pleasant state than the basic seat, improving the subject’s warmth and comfort, and also the concentration. In addition, the use of a cold water-cooling seat provided the highest satisfaction level, being the most favorable condition for rest.

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