Big knowledge of wearing the clothes cold-proofly

Big knowledge of wearing the clothes cold-proofly


1,Clothes thickness and keeping warm: Usually, people put on the clothes, can keep 1/3 from human body to lost heat of the external world on average. Someone work out, external temperature and clothes temperature difference of surface different different with wear clothes. It is 15.6 to uncover some temperature difference in temperature and body --At 17 , the temperature and temperature difference of the clothes surface are as follows: It is 11.8 to wear a shirt; It is 9.9 to wear a shirt and an undershirt; It is 6.3 to wear a shirt, an undershirt and an overcoat. It is easy to find out, the thicker clothes is, the better the keeping warm is.
2,Clothes thickness and wind: The clothes thickness not only relates to temperature but also relate to size of the wind. Generally speaking, on condition that change in temperature, when the wind-force is under force 3, the clothes thickness is very small with the change of the wind-force. And when the wind-force is greater than force 4, clothes will become large to increase the thick range rapidly.
3,Human body's thermostatical maintenance: In normal cases, the temperature in the human body is invariable, the change is very small in other words, it is generally 36.5 --37 . Want the body temperature which keep invariable, the heat that absorbs must equal the heat putting out. After the human body obtains heat, while carrying on various activities, should undoubtedly consume some heat, and the heat in lost human body that the human body will also come by way of radiation, convection, conducting and evaporating,etc.. However, various heat-dissipating ways, at different external temperatures, its size is different. When the temperature is 10 , it is comparatively outstanding that the radiation and convection dispel the heat, it is about 9 times that evaporation dispels the heat. With the rising of the temperature, reach at 21 , the proportion that the evaporation dispelled the heat has already been obviously strengthened, only 4 times that the evaporation dispels the heat of magnitude that the radiation, convection dispel the heat. But when higher than 30 in temperature, exceeds the radiation and convection to dispel the heat if the evaporation dispels the heat. People in clothes can last absorption of heat, convection, evaporating and conducting, thus has changed the state of gain and loss of human heat. The impact on heat-conduction of the clothes is very prominent, because the air is the hot poor conductor, after people have worn the clothes, have formed the air floor between clothes and skin, it looks like one " The angry wall " ,Stopping the radiation of human heat. According to studying, after people have worn the clothes, it is cold that no matter how external world is, the human surface is like in 33 air. Dress garment right away feel warm, it is not the clothes that will send out heat energy to the human body, but the clothes keep the reason difficult to be lost of human heat.
Someone has proposed: It is warm to wear three garments, or it is warm to wear and is equivalent to three garments and a thick garment? The answer is that the former is a bit warmer. Because many a garment, equal to " angry wall " keeping warm together more . Someone likes dressing oneself bulgingly when it is cold, the more ones that seem to wear are, the warmer ones that seem to wear are. It is not in fact like this. Because the keeping hot of the clothes relates to thickness of the inner air floor of the clothes. Clothes and health stick to closely, one layer of thickness of air is zero, it is the lowest to be cold-proof. After the garments of piece one one are put on, air layers of thickness increase thereupon, getting cold-proof to increase gradually. However, when one layer of thickness of air exceeds 15 millimetres, the air convection increases, heat distributes and increases either, cold-proof to drop instead. Moreover, it is thick to cross, have difficulty getting about, will hinder the metabolism of the body.
Someone study, point out behind the flow with skin, skin, clothes, clothes, heat among the air in the human body: The temperature difference in the human body and between the skin is greater than 2, just help the dispelling the heat effectively of the human body. Therefore get, in case of breeze of 0.5 meters per second, the uncovered human body in resting state, should keep the constant body temperature, the ambient temperature should be about 28 --30 ; If engaged in working slightly, the ambient temperature only takes 22 ; If in resting condition, the clothes of small quantity are worn, the ambient temperature only takes 23 . It means the maintenance of human body's constant body temperature in certain environment besides relating to the fact that wear clothing, still relate to state that the human body lives in.
4,Clothing and comfort: May not feel comfortable if the clothes dress too much and too thick. According to studying, a normal naked body person, in the presence of breeze, the temperature is the most comfortable at 30 , if wear a suit, feel comfortable ambient temperature is only 21 . Generally speaking, around temperature reduce 9 each time, increase one garment quantity of a suit feel comfortable quite soon.
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