The Measurement Research Of Hat Thermal Comfort Based On The Sweating Head

The research in the comfort of clothing are very important for social and economic. As describe the body and the environment,Clothing thermal comfort is an important index, meanwhile, that is the key for the Comfort research Correct estimation and evaluation the index of thermal comfort of clothing for clothing users and designers are very important. Therefore, many domestic and overseas researchers have been committed to the testing instruments for the dress of thermal comfort. As the equipment to simulate the exchange for thermal and moisture between body and environment, thermal manikin is a recognized way for scholars which is used to evaluate clothing. Developing of the thermal manikin experienced from dry to sweating. The means of sweating also experienced from Passive to active. in recent years, domestic and overseas researchers also developed thermal head model and thermal hand, foot model and etc, mainly to evaluate the comfort about helmet or headdress, gloves, shoes,and to guide the product'develop. The graduate from Donghua university-li pan have developed a sweating simulation head which is the unique sweaty simulation head device in the word can test the hat's performance in thermal and moisture. She followed her head in the area of the size of the general, designed the sweating head size, used the newest passive sweating principle, combined with virtual instrument Settings and heat (wet) resistance test of hat, evaluated thermal and moisture resistance performance in different hats successfully.This thesis mainly improved the sweating head's testing system based on the sweating head testing system which is developed by li Pan, perfected the date of the "Walter" manikin in head, and puts forward the relative total heat (wet) resistance and the inherent hot (wet) resistance concepts for clothing firstly,that can provide more accurate algorithm for clothing thermal and moisture resistance measurements, and promote the process in the research of clothing thermal comfort. This thesis mainly contents and conclusions are as follows: 1. According to problems of the sweating head-the temperature distribution was non-uniform, and the balance time was much longer.This thesis will refit copper head shell into three separate pumps,which make whole head inland waters in circulation, and the temperature distribution much uniformly than primary one. The sweating head sensor data and the infrared thermography images indicate that modified sweating head temperature uniformly, the upper and lower temperature difference step by 4 degree to 1 degree. At the same time this experiment modified in software parts of the program, system sampling period and PID parameters setting based on the primary which strive to shorten experimental cycle. Adopt the measure of piece together, then PID adjust to Kp= 8, Ti= 3, Td = 0.01, that saved the half of the balance time. Through experiment and data analysis, proofed that the experiment instrument repeatability and had good stability, and the result of measurement accords with average theory.2. In the past hot (wet) evaluation system, only use the manikin whole body surface area-S to calculate the relative total heat moisture resistance, did not consider the area covered by size on clothing thermal and moisture resistance measurement influence. This thesis according to heat and moisture balance principle, calculate the hat inherent thermal and moisture resistance algorithmhe exclusion area covered affect. It provide a thought for the research in monnikins'accurate measurement.3. According to the proposed inherent thermal and moisture resistance, This thesis designed and made three thickness, four kinds of style, for a total of 12 hat samples for experiment. Through calculation, obtained the inherent thermal and moisture resistance of hat. Through the data analysis, it is concluded that between the inherent thermal resistance and coverage exist obviously positive correlation. Owing to the error is much larger,the relationship between the inherent moisture resistance and coverage can not be proved.