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 Wysłany: Pon 19:54, 03 Sty 2011 Temat postu: ghd stijltang Clothing microclimate and subjective |
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Clothing microclimate and subjective sensation of relationship of the human body
Ranged outside the heat dissipation, and with different levels of human activity are not the same human body heat production, so the clothing (material), the human body in different environmental conditions and the state should have the corresponding thermal properties ( resistance) or ventilation capacity. 2) the physiological state of thermal comfort, look, when the body heat, heat to reach thermal equilibrium, the body is shown without a sweat, that is,[link widoczny dla zalogowanych], no sense of human sweat was sweating state, the body to release water to gaseous efflux. At this time, sweat Buzhi Yu accumulate in the body surface of the skin, the skin surface can be kept relatively dry. However, in some special cases, such as strenuous exercise the body, pathological sweating or external intrusion of water,[link widoczny dla zalogowanych], etc., in order to make the state is comfortable clothing (fabric) should also attract foreign capital as soon as possible the water surface of the skin to avoid skin surface accumulation of sweat,[link widoczny dla zalogowanych], the inner layer close to the skin and clothing, skin and clothing remain inside a dry state. 3) adapt to a variety of climatic conditions, clothing should be to prevent water intrusion from outside garment district in the capacity of micro-climate and good water vapor permeability, air permeability, micro-climate within clothing to maintain a low relative humidity and fresh air of Health . Moreover, the wearing apparel (fabric) to meet the thermal comfort, moisture permeability of the premise should have a good wind performance, too much outside air to prevent the role of the feeling of discomfort. 4) to dress the body in clothing microclimate within a certain range. 5) The comfort of clothing and human body is not a purely physiological or physical nature. Comfort when dressing the body but also by the psychological factors and the combined effects of other factors. 4. Clothing microclimate temperature inside the heat balance of the human body within 4.1 micro-climate clothing the temperature distribution around the body with a layer of clothes, warm, relatively dry, clean air layer, the heat outside the body temporarily slowed down. In the low temperature heat 80% of the human body through the skin outward diffusion, but dress the body surface temperature of the radiation can not diffuse directly to the surrounding atmosphere, but the clothes on in front, so warm clothes, and make gas between clothes and body heat. The original radiation from the surface heat loss to space in a certain period of time will be 27 \, 3. According to experiments confirmed that when the body temperature of naked out part of the temperature difference with the outside world is 15.6 ~ 17 ~ C, the clothing for the temperature difference between surface and ambient temperature is: wear a shirt when 11.8 \, a vest when 9.9 \Within a certain range, clothes, the thicker the more the gap in the gas content, the smaller the thermal conductivity of clothing; clothes, the lower the temperature of appearance, with the temperature difference between outside air temperature the smaller the heat loss to the surrounding air less. 4.2 The temperature distribution on the heat balance of the distribution of clothing and external temperature by the boundary layer of air descending from curved; clothing near the side of the body near the outside air temperature and the temperature difference on one side, which shows a thermal resistance of clothing. Clothing and air layer between the surface of the body caused by the change of thickness change of clothing thermal insulation capacity, the combination of clothing to increase not only the thickness of clothing, while there is an increase in the thickness of air layer. Between humans and the environment,[link widoczny dla zalogowanych], including heat transfer by the four main ways that \, that is, the greater the air layer, the more conductive and convective heat, when the air layer temperature decreases. 5. In summary, in considering the human dress subjective feelings of comfort, in addition to taking into account physical factors,[link widoczny dla zalogowanych], chemical factors, biological factors and social psychological factors, but also focus on taking into account the clothing and apparel in the two outer large factor. The only way to ensure that clothing and human body reach a certain comfort level, making the body's heat production and heat dissipation balance, and the microclimate inside the clothing temperature, humidity and other indicators remain within a certain range, the body feels comfortable.
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