| Sleep occupies an extremely important position in a person’s life,and sleep thermal comfort is getting more and more attention.In the hot summer climate,people often use air conditioning to create a stable low-temperature sleeping environment,and the abuse of air conditioning has led to more and more "sick building syndrome" and higher and higher building energy consumption.As a more energy-saving blower product,the fan also has a considerable ability to improve thermal comfort.This paper hopes to verify the effectiveness of the fan in the night sleep process through the study of the fan blower.In this paper,the flow field characteristics of four common types of fans on the market are first studied.The flow field characteristic parameters such as turbulence and power spectrum index at the center of each fan are calculated through continuous test of wind speed,and the results are compared and analyzed.The 9b fan was selected as the source of airflow for subsequent experiments.For the 9b fan,this paper further tested the specific wind speed value of the fan reaching all over the bed,which provided support for the wind speed value for the subsequent human body blowing experiment.The second major part of this article is the thermal comfort experiment of human hair blowing,which includes two parts: lying hair blowing and sleeping hair blowing all night.The subjects were subjected to blowing experiments in different gears in the state of lying down,and the relationship between the subjective thermal comfort,airflow and other feelings of feedback and different temperature and humidity conditions and different wind speeds was analyzed,and the thermal sensation and The fitting relationship between the standard effective temperature and the wind speed,and then the comfortable wind speed reference interval required for the human body to reach thermal neutrality in the state of lying down.On this basis,the wind speed required for all night sleep conditions was determined,and the subjects were subjected to all night sleep blowing experiments under different working conditions,and the subjective sleep quality,subjective heat sensation,and subjective airflow sensation were analyzed and explored.,Objective skin temperature,objective brain wave frequency division energy ratio and other parameters,and the sleep quality under different working conditions was evaluated by the results of these parameters,and it was found that 30 ℃ 50% was the best sleep quality for the subjects.condition.Finally,based on the aforementioned research results,this paper proposes two different control methods for imitating sleep circadian rhythm and sinusoidal wind,which are different from the traditional constant blowing,and designed a constant blowing method to refer to the overnight sleep blowing experiment to verify its improvement effect According to the results of the subjective and objective indicators of the subjects under the three blowing methods,the ranking of the three methods should be: simulated sleep circadian rhythm control method> sinusoidal control method>constant blowing method.It is proved that the imitation sleep circadian rhythm control method and the sinusoidal control method do have a certain improvement effect on the subject’s sleep thermal comfort and sleep quality during nighttime sleep. |
