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Experimental Research on Improment Measure of Thermal and Humidity Environment Based on Body Surface Impedance

Author: GuoHeng
Tutor: ZhengJie
School: Chongqing University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Sweating flu Transcutaneous electric impedance Thermal comfort Thermal sensation Thermal environment
CLC: TU831
Type: Master's thesis
Year: 2008
Downloads: 56
Quote: 1
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Abstract


Since the beginning of the last century, many researchers have been hot and humid environment of human thermal regulation reaction and subjective feelings (such as thermal comfort, thermal sensation, etc.), research has done a lot of work. Numerous studies have found that the thermal sensation of the body's skin temperature, body temperature, sweating and skin moisture, thermal comfort has important implications. Body heat is uncomfortable in the hot and humid environment, mainly caused by the human body sweating and body temperature rises. Hotter environment or have a higher metabolic rate level as the labor movement and thermally comfortable and body sweating more important. Adjust the behavior of one of the papers from the physiological hot - sweating as a starting point, a simple and fast surface impedance method sweating degree of measured, combined with a sense of subjective sweating survey of indoor thermal environment and its impact on human thermal comfort implications of the study, the main work and conclusions are as follows: (1) the subjects were sweating sensitivity and sweating the critical temperature, the results showed that: (1) sweat more sensitive parts of distribution in the forehead lower, chest, back, and neck; ② forehead, chest and back sweating critical temperature, were slightly lower than 30 ℃, extremities sweating critical temperature higher. (2) analysis of the sense of human sweat and body surface electrical impedance corresponding relationship that transcutaneous electric impedance as quantitative indicators to determine the state of the body is sweating, the results are as follows: the transcutaneous electric impedance tester AC signal frequency 1000Hz when transcutaneous electric impedance than 24k?, human skin is dry and sweat-free state; human skin when the transcutaneous electric impedance range 20k? ≥ SI gt; 8k?, some sticky; When the body surface electrical impedance lower than the 7k?, the human skin in a moist state. (3) analysis of human sweat and heat is not a comfortable relationship, put forward the concept of average body surface electrical impedance, the research results show that: the human body in thermal comfort when the average body surface electrical impedance than 20k? Impedance range 20k? ≥ SI gt; 18k? critical transition interval for a comfortable condition and a little uncomfortable state; When mean skin electrical impedance is 18k? ≥ SI gt; 10k? between the human body is a little uncomfortable state, the impedance range 10k? ≥ SI gt; 7k? bit uncomfortable and uncomfortable state critical transition interval. (4) the subjective thermal sensation questionnaire were analyzed, the results showed that: as the ambient temperature rises, the rate of change of various parts of the thermal sensation of the same, and various parts of the summer heat neutral temperature. The use of the fuzzy mathematical statistics method to get the membership function of the indoor temperature thermal sensation, corresponding to the different thermal sensation level membership for a known indoor air temperature can be easily obtained. (5) Chongqing summer high temperature, humidity, wind slow climate characteristics, corresponding cooling, dehumidification, ventilation measures to improve indoor thermal environment to meet the needs of the people of thermal comfort.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning
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