5 Does the humidity of moist air decrease after it is preheated Why

After drying, it evaporates to a high altitude.

The moisture absorption capacity of moist air increases with the increase of air temperature, because the temperature of moist air increases, and the saturation pressure increases accordinglyWater vaporThe content of the unchanged is moist airRelative humiditywill decrease, that is, the moisture absorption capacity of moist air will increase.

Relative humidity: The ratio of the actual amount of water vapor contained in moist air to the maximum possible amount of water vapor at the same temperature is "relative humidity", which is often expressed as a relative humidity between 0 100%. The lower the value, the drier the air and the stronger the ability to absorb water.

The higher the value, the more humid the air and the weaker the ability to absorb water. The moisture absorption capacity of moist air is also related to its temperature, the temperature of moist air increases, the saturation pressure increases correspondingly, so that the content of water vapor remains unchanged, then the relative humidity of moist air will decrease, that is, the moisture absorption capacity of moist air increases.

Effect of temperature and humidity on electrical equipment:

Excessive humidity reduces the dielectric strength of electrical equipment. On the one hand, the humidity is too high, which reduces the insulation performance of the air, and many places in the switchgear are insulated by air gaps.

On the other hand, moisture in the air adheres to the insulating material.

surface, so that the insulation resistance of electrical equipment.

Reduction, especially for equipment with a longer service life, will have a more severe degree of humidity and lower insulation resistance due to the accumulation of dust inside to absorb moisture. The leakage current of the equipment is greatly increased, and even causes insulation breakdown and accidents.

Yes, the higher the humidity of the air, the more moisture it contains in the same range, the higher the moisture content.

Relative humidity is the percentage of water vapor pressure in the air compared to the saturated water vapor pressure at the same temperature. or the ratio of the absolute humidity of moist air to the maximum absolute humidity that can be achieved at the same temperature. It can also be expressed as the ratio of the partial pressure of water vapor in moist air to the saturation pressure of water at the same temperature.

Relative humidity, denoted by RH. Represents the ratio of the absolute humidity in the air to the saturated absolute humidity at the same temperature and pressure, yielding a percentage. (That is, the ratio of the mass of water vapor contained in a moist air to the mass of water vapor contained in saturated air at the same temperature and pressure, expressed as a percentage.)

For example, the humidity of a computer room is usually 60%, which refers to the relative humidity. )

No, the two are not the same concept.

In the drying operation, after the moist air passes through the preheater, the relative chanting of the Zen respects the wetness of the cave will be ().

Enlarge. No change.

Drop (correct answer).

Not sure.

Wrong! When the relative humidity is equal to 1, it means that the water molecules in the air have reached the upper limit of the air's water-containing capacity, that is, the water molecule content has reached saturation. The water-holding capacity of air refers to the ability of air to carry "water molecules".

Water vapor, which is actually a group of small water droplets coalescing, is a form of water, not water molecules. When the water molecules in the air reach the upper limit of the carrying capacity of the air, if there is a steady stream of water molecules added to the air, then the water molecules in the air are overloaded, and at this time, water vapor or fog will appear.

When the relative humidity is equal to 1, there may be no water vapor in the air at all. However, if there is water vapor or fog in the air, then the relative humidity of the air must be equal to 1

1.Why is dry steam humidification of treated air considered an isothermal humidification process? What other methods can be used in the isothermal humidification process+

Hello dear, 1Dry steam humidification of treated air is regarded as an isothermal humidification process because in this process, instantaneous cooling and condensation occur when water vapor enters the air, releasing the corresponding latent heat, so that the temperature is basically unchanged. Therefore, although the water vapor enters the air, the heating and cooling processes cancel out, so in this case, the humidification process of the air in the hotel is considered to be an isothermal humidification process.

2.The isothermal humidification process means that during the humidification process, the temperature of the air does not change. In addition to dry steam humidification, common isothermal humidification processes include:

1) Spray humidification: spray water into the air to make the water form a water mist, and absorb the heat in the air after the water evaporates, and the air temperature remains unchanged, so as to achieve the purpose of humidification. (2) Cyclone humidification:

The air and the fine water droplets are mixed by a cyclone, so that the water droplets evaporate and take away the heat in the air, and the air temperature remains unchanged. (3) Ultrasonic humidification: water is formed into a mist through ultrasonic vibration, which enters the air to evaporate, and the air temperature remains unchanged during the humidification process.

In practical applications, we can choose the corresponding humidification technology according to different needs and occasions, and adjust it in combination with air quality, temperature, humidity and other factors to achieve the best humidification effect.

1.Why is dry steam humidification of treated air considered an isothermal humidification process? What other methods can be used in the isothermal humidification process+

Hello dear, dry steam humidification of treated air is considered as an isothermal humidification process because in this process, the temperature of the added steam is equal to the temperature of the added air. Since the temperature does not change, the relative humidity in the air increases as the amount of moisture added. The isothermal humidification process can be achieved by other methods such as spray humidification, cyclone humidification, and ultrasonic humidification, among others.

These methods all allow moisture to be added to the air while keeping the air temperature constant. Subheading: Spray HumidificationSpray humidification is a common isothermal humidification method that achieves humidification by spraying moisture into the air in the form of tiny particles.

Since moisture is present in the form of extremely small particles, it can evaporate quickly and absorb heat without affecting the temperature of the air. Sub-heading: Cyclone humidificationCyclone humidification is also an isothermal humidification method that uses a rotating blower to blow air into the device and evenly disperse the moisture into the air through a high-speed rotating centrifugal force.

This method likewise increases the relative humidity in the air without changing the temperature of the air. Subheading: Ultrasonic Humidification Ultrasonic humidification is a new type of isothermal humidification method, which uses ultrasonic** to break down water into tiny particles and disperse them evenly into the air.

This method has the advantages of high efficiency, low noise and low energy consumption, so it has been gradually widely used in recent years. In summary, dry steam humidification treats air as an isothermal humidification process because it keeps the air temperature constant. In addition to holding the circle, spray humidification, cyclone humidification and ultrasonic humidification can also achieve isorub hand temperature humidification.

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The answer is no. The analysis is as follows:

1) Definition of relative humidity: fi = v s = pv ps, where pv is the partial pressure of water vapor in humid air, ps is the saturation pressure of water vapor at this temperature;

2) The content of water vapor in the air d=mv (mA+mV), where mv is the mass of water vapor in the humid air, and ma is the dry air quality, then (mA+mv) is the total mass of the moist air;

3) The greater the relative humidity of the moist air, that is, the greater the FI, which can only indicate that the PV is closer to the saturation pressure PS;

4) As the temperature rises, PS increases, indicating that the moist air has a greater ability to absorb water vapor;

5) If there are two temperatures t1 and t2, and assuming t1 t2, pv1 = ps1 pv2, then there is:

mv1＜mv2

and fi1=1

fi2=pv2/ps2＜1

So fi1> fi2 but d1