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Digital Temperature Humidity meter

Time:2019-10-29 13:14:07  Source:  Author:


The subjective perception of the human body to the external meteorological environment is different from the results of various meteorological elements acquired by atmospheric detection instruments. The human comfort index is a bio-meteorological indicator based on the meteorological point of view to evaluate the comfort of people in different climatic conditions and based on the heat exchange between the human body and the atmospheric environment. The human body's physiological functions such as heat balance function, body temperature regulation, endocrine system, and digestive organs are affected by a variety of meteorological elements. For example, atmospheric temperature, humidity, air pressure, light, wind, and the like.

Experiments show that when the temperature is moderate, the effect of humidity on the human body is not significant. Because humidity mainly affects the body's thermal metabolism and water and salt metabolism. When the temperature is higher or lower, the fluctuation of the body's heat balance and warmth becomes very important. For example, when the temperature is 15.5 ° C, even if the relative humidity fluctuates by 50%, the impact on the human body is only 1 ° C of the temperature change. When the temperature is between 21 and 27 ° C, if the relative humidity changes to 50%, the heat dissipation of the human body will be significantly different. When the relative humidity is 30%, the heat dissipation of the human body is more than 80% relative humidity.

When the relative humidity exceeds 80%, since the high temperature and high humidity affect the evaporation of human sweat, the heat balance of the body is destroyed, and the human body may feel stuffy and uncomfortable. This situation will become more apparent as the temperature increases. When the winter weather is cold and humid, the body's thermal radiation is absorbed by the water vapor in the air due to the high relative humidity in the air. In addition, the clothes absorb moisture in the humid air, and the thermal conductivity increases, which accelerates the heat dissipation of the body and makes people feel cold and uncomfortable.

When the temperature is lower than the skin temperature, the wind can accelerate the heat dissipation of the body. For every 1 m/s increase in wind speed, people will feel that the temperature has dropped by 2-3 °C. The higher the wind, the faster the heat dissipates, and the more people feel cold and uncomfortable. In general, the four meteorological elements of temperature, air pressure, relative humidity, and wind speed have the greatest impact on human body perception.