How to understand the real temperature commonly used in air conditioners

How to understand the real temperature commonly used in air conditioners

The response of the surrounding air environment to human physiology is not the effect of a single factor, but the total effect of combining the temperature, humidity and air velocity of the surrounding air. In air conditioning engineering, the total effect of these three effects is usually used Expressed by the temperature index, it is called the actual temperature.

　　 Various combinations of air in different states may produce the same real temperature. At the same time, even under the same air conditions, due to the various differences in age, gender, physical fitness, labor intensity, clothing, living habits, and location of each person, the temperature is actually different.

　　 Most people feel comfortable environmental conditions as shown in Table 11.

In winter, because the outdoor temperature is lower than the workshop temperature, heat will be transferred from the room to the outdoors through the enclosure structure. If the heat loss in the workshop is greater than the heat generated inside the workshop (heat generated by machinery and human bodies), the workshop temperature will drop At this time, the air-conditioning equipment sends higher-temperature air (sending hot air) to the workshop to supplement heat, and at the same time discharges the lower-temperature air out of the workshop.

　 　 In addition, some process equipment emits a certain amount of water vapor. In order to maintain a certain humidity in the workshop, air conditioning equipment is usually used to send drier air into the workshop, while the humid air is discharged out of the workshop.

　　 Therefore, the air conditioning equipment must process the air before sending it into the workshop according to the outdoor climate conditions and indoor conditions. In summer, the air sent to the workshop is generally cooled and dried (dehumidified) first; in winter, it is generally heated and humidified first.

　　In textile factories, we usually use the method of direct contact between water and air (t=20℃, φ=65%). The moisture regain is very low. When the relative humidity is increased, the increase in moisture regain is also extremely limited.

　　The relationship between temperature and fiber moisture regain has little effect when the relative humidity is constant. Generally speaking, as the temperature increases, the water molecules in the fiber move more strongly than at low temperatures. The kinetic energy of water molecules escaping from the fiber increases and the probability of leaving the fiber increases. Therefore, under equilibrium conditions, the moisture absorption performance of the fiber changes with As the temperature increases and decreases.