Effect Of Asymmetric Radiation On Human Thermal Comfort In Room In Cold Area

Capillary radiation air conditioning has been widely used in many countries,because of its advantages such as comfort,energy saving,no hair feeling,no noise and uniform temperature distribution.Due to the limitation of capillary installation,the asymmetry of capillary radiation has a certain impact on human comfort.Therefore,it is necessary to do further research about the human thermal comfort in the confined space of the cold area.The numerical simulation analysis is carried out by the simulation software Airpak,and the experimental platform of capillary radiation heating is built to do experimental research.Under the condition of asymmetric radiation,the local skin temperature,heart rate and blood pressure changes with time are obtained by experiment,the evaluation model of between the human thermal acceptability and thermal comfort,thermal sensation was obtained by linear regression equation.Firstly,this paper analyzes the main factor affecting the radiation heat transfer of capillary,the angle factor is analyzed and calculated to obtain the calculation model and formula :one is between the human body and the wall surface,another is between the wall and the wall.On this basis,several methods of evaluating thermal environment were put forward,through we analysis the thermal sensation and thermal comfort of the subjects to obtain the relationship between the human body and them.Secondly,the Airpak software is used to simulate the different distance from the capillary,outside window and the ground surface,under the each kind of condition,the distribution of indoor air temperature,air humidity,PMV and PPD and the effect of asymmetric radiation on human thermal comfort,the results show that asymmetric radiation has a greater influence on the human within the range of 0.5m distance outside window,capillary and the ground,the closer distance,the greater influence,vice versa.Thirdly,we measured the experimental data of the capillary radiation system under variousconditions.It mainly includes: indoor air temperature,air humidity,skin surface temperature,the internal surface temperature of the enclosure structure,outdoor air temperature and humidity,heart rate and blood pressure,human thermal comfort,thermal sensation.The influence of asymmetric radiation on the local skin temperature is obtained by using Origin,and the correctness of the simulation analysis is further verified.Finally,human thermal feeling,thermal comfort,heart rate and blood pressure change with time were analyzed to obtain the relationship between human thermal acceptability and human thermal comfort,thermal sensation by linear regression under the different conditions.The results show that the local skin temperature is greatly affected under the condition of asymmetric radiation,and the heart rate and blood pressure are almost not;temperature higher,the temperature of local and whole body is also;the thermal sensation and thermal comfort of human body were most affected by the most unfavorable part of the body and is similar to it;human thermal acceptability and thermal sensation is not a strong correlation,but with thermal comfort.