| Comfortable working and living environment have a positive effect on humanhealth and working efficiency.So far, the related research on thermal environment atdomestic and abroad is mostly carried out in atmospheric pressure environment.Atmospheric pressure reduces along with the altitude growth, variations in air densityand oxygen content have a certain extent effect on human physiology and thermalcomfort.Carrying out the related research has a positive significance on explicitness ofphysiological thermal reaction and improvement of human comfort in low atmosphericpressure environment.This papaer carried out the related research on human thermal regulation in lowpressure environment below3000meters, low pressure and hypoxia can cause somecompensatory physiological reactions of human physiological functions in thisrange,but no pathological reactions (To solve firstly is the preventions and treatmentsfor altitude reaction and altitude sickness at the altitudes of over3000metres,it usuallyneeds to be achieved by means of medicine).The research was mainly based on humanphysiology and thermal regulation theory,carried out the experimental study andtheoretical analysis on physiological parameters related to human thermal regulation inlow pressure environment.By designing different pressure conditions to simulate thelow pressure environment of different altitudes, and designing different environmentaltemperatures and human movement forms to simulate different thermal environmentsand human activity levels,to analyze of the human body requirements for the thermalenvironment, the variations of human heat production and various physiologicalparameters.On the basis of the research which includes variations of humanphysiological parameters and heat dissipation models in low atmospheric pressureenvironment,to establish a two-node model of human thermal regulation which appliesto the low pressure environment and carry out the verification.Using this model tocalculate the Standard Effective Temperature SET*, which is the thermal environmentevaluation,analyzing of variation regulation of SET*in the low pressure environment,establishing a linear fitting curve between average experimental thermal sensation votesof human body MTS and standard effective temperature SET*, revising the comfortarea of ASHARAE comfort standard55-74in low pressure environment.We hope thatthese methods would provide some references for the thermal comfort study. The main conclusions are as follows:（1）The metabolism significantly increaseswith the decrease of atmospheric pressure, and the variation trends of metabolic rate indifferent activity levels were all the same,increases with the decrease of atmosphericpressure;（2）In the temperature range of20℃~30℃,the relation curve betweenmetabolism and environmental temperature is an inverted U-shaped;（3）With thedecrease of atmospheric pressure,corresponding standard effective temperature reducesin the same dry bulb temperature and relative humidity conditions;（4）In the same drybulb temperature and atmospheric pressure conditions,corresponding standard effectivetemperature increases with the increase of relative humidity,the increase of relativehumidity can appropriately compensate the cold sensation,which results from thedecrease of atmospheric pressure（;5）In the different atmospheric pressure conditions,itis a good linear relationship between thermal sensation and standard effectivetemperature.With the decrease of atmospheric pressure,thermal sensation variessignificantly with the variation of standard effective temperature,thermal neutraltemperature and human acceptable temperature increase;（6）Human comfort areas indifferent atmospheric pressure conditions are different.With the decrease of atmosphericpressure,the human comfort area range moves to the higher dry bulb temperature, upperand lower limits of comfort area in low pressure environment are relatively higer thanthose in ASHRAE Standard54-74,1atm. Range of human thermal comfort zone getswider. |
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