Research On Unsteady-state Human Exergy Model For Evaluating The Comfortable State Of Dynamic Indoor Thermal Environment

Given that the exergy analysis method combines the first and second laws of thermodynamics to analyze and evaluate the loss caused by irreversible factors in the process of human energy transfer,taking into account the influence of indoor and outdoor environmental parameters,it is possible to more accurately evaluate natural ventilation buildings and The comfortable condition of the dynamic thermal environment of the air-conditioned building,this paper selects the unsteady-state human exergy model to analyze the thermal comfort of the dynamic environment of the buildingFirstly,Explore and reveal the dynamic changes of human body exergy consumption rate and thermal comfort in the room of low-temperature and low-humidity,low-temperature and high-humidity,high-temperature and low-humidity,high-temperature and high-humidity environments.It was found that when the temperature is very high in summer,the relative humidity has a significant effect on the human thermal comfort,and people will feel more comfortable in a room with low relatively relative humidity.When the temperature is very low in winter,people will feel more comfortable in an environment with a lower relative humidity;moderate temperature in the transition season,relative humidity has no obvious effect on human thermal comfort and human body exergy consumption rate.Next,it was found that when the indoor temperature is constant in summer,the rate of the human body in a environment with low radiation temperature changes faster with time,people will feel more comfortable than the indoor temperature is consistent with the radiation temperature.When the indoor temperature is constant in winter,the average radiant temperature is lower than the indoor temperature.The human body exergy consumption rate change faster with the passage of time.The value of stabilized exergy consumption rate is also greater,and the human discomfort will be stronger.In an environment where the average radiation temperature is higher than the indoor temperature,people will feel more comfortable.Further,This article also used the unsteady-state human exergy model to explore the law of the human body’s exergy consumption rate and thermal comfort in four dynamic thermal environments:"hot-neutral-hot","neutral-hot-neutral","cold-neutral-cold",and "neutral-cold-neutral".t was found that the "transcendence phenomenon" appeared in the change curve of the loss rate of the human body with time under the four conditions,and the greater the temperature abrupt change,the more obvious the "transcendence phenomenon",And the human body’s exergy consumption rate is consistent with the trend of the uncomfortable index TSENS with time.In summer,people feels more discomfort when enters from a neutral environment to a hot environment.than enters from a hot environment to a neutral environment;In winter,people feels more discomfort when enters from a neutral environment to a cold environment than enters from a cold environment to a neutral environment.In addition,In addition,this also article explored the changing law of human body’s exergy consumption rate and thermal comfort under the gradual change of room temperature in summer,and found that different outdoor temperatures will affect the size and change speed of human loss rate,but will not affect the thermal comfort of indoor humans.