| People spend most of their time indoors.Therefore,the indoor environment directly affects people's health and quality of life.With the continuous development of society,small space vehicles such as ship rescue capsules and space capsule subway airplanes have emerged.With the tense urban areas and increasing population,capsule hotels,temporary mobile homes,and train carriages are in people's lives.The proportion is also increasing,but this narrow space often causes people's discomfort due to crowding,inability to walk around,and small space.At the same time,the problem of poor air quality in space often causes people's dissatisfaction.Although with the advancement of science and technology,the problem of pollutants generated by construction materials is gradually solved,but people themselves are a source of pollution and will continue to produce pollutants but cannot be solved.As a metabolite of the human body,carbon dioxide can be used to characterize how much the body produces metabolic waste,and indirectly reflects the quality of indoor ventilation.Based on this,the study of temperature and CO2 comfort in human body in a narrow space has important significance for the design of indoor ventilation design parameters.This experiment is divided into two parts.The first part mainly studies the impact of unconfined and confined spaces(the communication between narrow spaces and the external environment to allow air circulation to explore the effects of narrow spaces on the human body).This experiment was conducted in Chongqing.In the artificial climate room of the University City Experimental Building,a total of 16 subjects were recruited,8 men and 8 women.It is mainly divided into four working conditions: temperature rise in a narrow space,temperature drop in a narrow space,temperature rise in normal space,and temperature drop in normal space.The temperature of each working condition was increased from 18°C to 34°C or from 34°C to 18°C to study the difference in human comfort between the narrow space and the normal space at different temperatures.The second part mainly studies the influence of temperature and carbon dioxide on the comfort of the human body within a confined and confined space(insulated in a narrow space from the external environment).This experiment uses the aircraft cockpit environment platform of the Chongqing University Experimental Building to control environmental parameters.Twenty subjects were recruited,including 10 men and 10 women.The temperature conditions were 24°C,26°C,and 28°C,respectively.The carbon dioxide concentration conditions were 750 ppm,1500ppm,and 3000 ppm.The temperature and CO2 operating conditions were respectively divided into two groups of 9 working conditions to study at different temperatures.The effect of the combination of carbon dioxide on human comfort.Through the analysis of the results,although the thermal response and the psychological reaction of the narrow space and the normal space have certain differences at certain temperatures,the difference is not significant after significant test,that is,the cause of the uncomfortableness of the human body lies in the indoor environment parameters,not the size of the space.Subsequently,in experiments conducted in a confined and confined space,the temperature and the effects of carbon dioxide on human comfort were found to show that at 24°C,the human body's thermal sensation,thermal comfort,wet sensation,wet comfort,and overall environmental satisfaction under three CO2 concentration conditions There was no significant difference in the degree.There were no significant differences in symptoms of human discomfort except for nausea and no appetite,but the air freshness and air quality acceptability decreased with the increase of carbon dioxide concentration;at the time of 26°C,the three carbon dioxide concentrations Under the operating conditions,the body's thermal sensation,thermal comfort,wet sensation,wet comfort,overall environmental satisfaction,air freshness,and air quality acceptability were also not significantly different,and the complaint rate of unwell symptoms increased to 3000 ppm in the carbon dioxide concentration.Significantly increased: Feeling tired,lack of sleepiness,drowsy spirit,lack of concentration,nausea,loss of appetite,chest tightness,wheezing,and tinnitus;at 28°C,the body's air freshness and air quality are acceptable under three concentrations of carbon dioxide.There was no significant difference between degree,overall environmental satisfaction,and uncomfortable symptoms(except mental depression and headache)different.There is a significant difference in thermal sensation and thermal comfort of the human body at 750 ppm,1500 ppm,and 3000 ppm carbon dioxide concentrations.In terms of physiological parameters,the effect of carbon dioxide concentration on human skin temperature at 24°C and 26°C is not significant,but skin temperature at 28°C increases with the increase of carbon dioxide concentration;the blood oxygen saturation of the human body increases with carbon dioxide concentration.The increase has a downward trend,but it is not significant;when the ambient temperature is 24°C or 26°C,the human heart rate at 3000 ppm is higher than the human heart rate at 750 ppm,but at 28°C,the human body's three carbon dioxide concentrations There is no significant difference in heart rate,heart rate will increase with the increase of temperature;the body's blood pressure does not change with temperature,carbon dioxide concentration changes.Finally,through analysis,it is found that the main factor affecting the human comfort in a narrow space is the air freshness,and puts forward suggestions for the regulation of indoor temperature and carbon dioxide concentration.When the human body is exposed for a short period of time,it is recommended to set the ambient temperature to 26°C or below.Adjusting ventilation at 26°C Set the CO2 concentration to 1500 ppm or below,and set the CO2 below 3000 ppm at 24°C to meet the comfort requirements of the human body. |
PDF Full Text Request