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

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.

scholarly journals Experimental Study on the Combined Heating of Phase-Change Water Tank and Different Terminal Cooling Equipment

2021 ◽  
Vol 2087 (1) ◽  
pp. 012036
Author(s):  
Hang Zou ◽  
Zhanqiang Liu ◽  
Enshen Long
Keyword(s):  
Experimental Study ◽  
Thermal Comfort ◽  
Phase Change ◽  
Human Body ◽  
Capillary Tube ◽  
Heating Temperature ◽  
Storage System ◽  
Longitudinal Distribution ◽  
Water Tank ◽  
Indoor Temperature

Abstract In this paper, we set up a solar energy-phase change heat storage system and experimental study on the matching of the phase-change tank and three different terminal cooling equipment. Among them, phase-change water tank is used as heat source, meanwhile, radiator, heater and capillary as terminal cooling equipment. When radiator the terminal is radiator, the indoor temperature is difficult to meet the heating temperature requirements. When the terminal is heater, the indoor temperature can meet the requirements of heating temperature. However, the longitudinal distribution and lateral distribution of indoor air temperature are unevenly distributed and affect the thermal comfort of human body. When the terminal is capillary tube, the indoor temperature maintain at a high temperature and the temperature is satisfied with the thermal comfort of human body. Therefore, the capillary tube as the terminal cooling equipment is more advantageous of matching with the phase-change tank.

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

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.

A generalized model of human body radiative heat exchanges for optimal design of indoor thermal comfort conditions

Solar Energy ◽  
2018 ◽  
Vol 176 ◽  
pp. 556-571 ◽  
Author(s):  
Concettina Marino ◽  
Antonino Nucara ◽  
Giorgia Peri ◽  
Matilde Pietrafesa ◽  
Gianfranco Rizzo
Keyword(s):  
Optimal Design ◽  
Thermal Comfort ◽  
Human Body ◽  
Radiative Heat ◽  
Generalized Model ◽  
Indoor Thermal Comfort ◽  
Heat Exchanges

Design and Optimization of Air Supply System to Satisfy the Thermal Comfort of Human Body

2021 ◽  
pp. 609-616
Author(s):  
Jue Qu ◽  
Hongjun Xue ◽  
Wei Wang ◽  
Sina Dang ◽  
Xiaoyan Zhang
Keyword(s):  
Thermal Comfort ◽  
Human Body ◽  
Supply System ◽  
Design And Optimization ◽  
Air Supply

Effect of solar radiation on human thermal comfort in a tropical climate

2020 ◽  
pp. 1420326X1989176 ◽  
Author(s):  
Somsak Chaiyapinunt ◽  
Nopparat Khamporn
Keyword(s):  
Solar Radiation ◽  
Surface Temperature ◽  
Thermal Comfort ◽  
Human Body ◽  
Glass Surface ◽  
Tropical Climate ◽  
Direct Solar Radiation ◽  
Diffuse Solar Radiation ◽  
Human Thermal Comfort ◽  
Comfort Condition

The contribution of solar radiation on the global thermal comfort and local thermal comfort condition for a person sitting near a glass window in a building located in a tropical climate was studied. The effects of transmitted direct solar radiation, transmitted diffuse solar radiation, inside glass surface temperature and distance of a seated person from the glass window on the predicted percentage of dissatisfied (PPD) and plane radiant temperature asymmetry (RTA) were studied. PPD and RTA due to transmitted diffuse solar radiation and high inside glass surface temperature were decreased with the distance from the glass window. PPD was decreased exponentially with the distance from the glass window, while RTA was decreased slowly with the distance from the glass window. The findings show that PPD and RTA due to transmitted direct solar radiation striking the human body are not dependent on the distance from the glass window, but they are dependent on the magnitude and direction of the solar beam radiation incident on a human body. The results of the study would help the building designers to be able to design the interior working space for the tenant sitting near the glass window to achieve the acceptable level of thermal comfort condition.

scholarly journals Study of RF Signal Attenuation of Human Heart

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Kedar Nath Sahu ◽  
Challa Dhanunjaya Naidu ◽  
M. Satyam ◽  
K. Jaya Sankar
Keyword(s):  
Reflection Coefficient ◽  
Human Body ◽  
Human Heart ◽  
Pulse Propagation ◽  
Cardiac Activity ◽  
Diagnostic System ◽  
Signal Attenuation ◽  
Propagation Modeling ◽  
Fixed Dimension ◽  
Rf Signal

A study of ultrawideband pulse propagation modeling through human body for all frequencies from 0.1 to 10.5 GHz is presented. Reflection coefficient and signal attenuation are computed from the model considering the variation of heart dimension with respect to time unlike a fixed dimension of heart used in earlier models. The performance of cardiac activity is studied from the change of signal attenuation. This estimation may help in the design of a noninvasive diagnostic system using ultrawideband of frequencies.

Analysis of thermal comfort properties of jacquard knitted mattress ticking fabrics

2016 ◽  
Vol 28 (1) ◽  
pp. 105-114 ◽  
Author(s):  
Sena Terliksiz ◽  
Fatma Kalaoğlu ◽  
Selin Hanife Eryürük
Keyword(s):  
Thermal Conductivity ◽  
Sleep Quality ◽  
Thermal Comfort ◽  
Human Body ◽  
Air Permeability ◽  
Vapour Permeability ◽  
Content Type ◽  
Textile Materials ◽  
Sleep Environment ◽  
Comfort Parameters

Purpose – Sleep is a vital and a basic activity of human life and it is a physiological need for human body. Sleep quality is directly influenced by the comfort conditions of sleep environment. The purpose of this paper is to define the role of textile materials utilized as bed fabrics on air and mass transfer from the human body. Design/methodology/approach – Thermal conductivity, thermal resistance, thickness, water vapour permeability and air permeability properties of fabrics were analyzed and statistically evaluated. Thermal conductivity and resistance measurements were performed in Alambeta test instrument. Water vapour permeability tests were done according to the Rotating Platform method, and air permeability was measured in FX 3300 Textest air permeability tester. Relationships between comfort parameters were statistically evaluated with correlation analysis. Findings – Comfort is a major concept in the determination of overall life quality as well as sleep quality of a resting person. Therefore academic studies about thermal comfort prediction of sleep environment and bed surface fabrics are of great importance. This study investigates conventional mattress ticking fabrics in terms of comfort parameters and defines the important fabric properties on comfort parameters. Originality/value – Sleep comfort is a promising area in textile comfort studies with its dynamics different from body thermal comfort during daily life. However, in general comfort studies are about garment materials which are in direct contact with the skin. This study tries to define the comfort status of textile materials which have indirect contact with the human body surface during sleep duration.

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