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Some basic knowledge of dehumidification dryer
Date:2018-03-20 15:05:39 Hits:5320
Some basic knowledge of dehumidification dryer
Many people may know nothing about the dehumidification dryer. One or two, it may be clearer for him to use. If we want to better use such equipment, we should know more knowledge.
1. water vapor pressure and relative humidity
Although the content of water vapor in the atmosphere is not much, it is a very active component in the atmosphere and plays an important role in the weather and climate. There are many methods of measuring water vapor in the atmosphere, and people are most concerned about water vapor pressure, absolute humidity and relative humidity in daily life.
Water vapor pressure (E) is the partial pressure of water vapor in atmospheric pressure, and pressure measurement with 100 deforestation work taking place. The former pressure and water vapor pressure are often measured by the millimeter number of mercury column, 100 = 0.75008 millimeter mercury column. The pressure of water vapor in the air at a certain temperature is called saturated vapor pressure (E). The saturated vapor pressure increases rapidly with the increase of temperature.
Absolute humidity (a) refers to the water vapor mass in the wet air per unit volume, that is, the water vapor density in the air, and the unit is 3 or kilogram / meter 3. Absolute humidity is not easy to measure directly, and the actual use is less. If the unit of water vapor pressure is 100 PAS, the unit of absolute humidity is 3 per kilogram / meter, then the relationship is: T is the temperature.
Relative humidity (f) refers to the ratio of the vapor pressure e of air to the saturated vapor pressure E of the same temperature. It is expressed as a percentage: relative humidity indicates the degree of air saturation. When f=100%, the air has reached saturation; when unsaturated, f<100%; over saturation f > 100%. The relative humidity is not only related to the water vapor content in the atmosphere, but also decreases with the increase of temperature.
2. relative humidity
At the same temperature, the ratio of water vapor content to the saturated vapor content in the air.
It is explained in detail that the relative humidity of wet air is P and T at temperature. The relative humidity of wet air refers to the ratio of mole fraction of water vapor in a given moist air to the saturated water vapor of pure water surface under the same temperature T and pressure P, expressed in percentage.
Relative humidity is the ratio of two pressure values:%RH = 100 x p/ps
Where p is the actual part of the pressure environment of the water vapor saturation pressure value; PS is around the water environment value, the relative humidity sensor is usually calibrated in the standard room temperature conditions (above 0 degrees), accordingly, usually think this sensor can indicate the relative humidity in all temperature conditions (including below 0 degrees), steam pressure conditions will produce the liquid water below the ice. Therefore, when liquid water appears in the form of ice, condensation occurs when relative humidity is less than 100%.
3. relative humidity balance
The hygroscopic substance will strive to maintain the balance between its own humidity and the ambient humidity. Water in the matter produces water vapor pressure (PM) on its surface, and water in the surrounding atmosphere produces vapor pressure (P). If PM is the same as P, the relative humidity is balanced between the substance and its environment. Any difference between PM and P produces moisture exchange, resulting in a change in the moisture content of the material until the relative humidity is reached. Therefore, the relative humidity of the substance is defined as the relative humidity in the ambient atmosphere that will not cause the exchange of moisture. (the humidity of the atmosphere must be greater than the humidity of the substance)
Many people may know nothing about the dehumidification dryer. One or two, it may be clearer for him to use. If we want to better use such equipment, we should know more knowledge.
1. water vapor pressure and relative humidity
Although the content of water vapor in the atmosphere is not much, it is a very active component in the atmosphere and plays an important role in the weather and climate. There are many methods of measuring water vapor in the atmosphere, and people are most concerned about water vapor pressure, absolute humidity and relative humidity in daily life.
Water vapor pressure (E) is the partial pressure of water vapor in atmospheric pressure, and pressure measurement with 100 deforestation work taking place. The former pressure and water vapor pressure are often measured by the millimeter number of mercury column, 100 = 0.75008 millimeter mercury column. The pressure of water vapor in the air at a certain temperature is called saturated vapor pressure (E). The saturated vapor pressure increases rapidly with the increase of temperature.
Absolute humidity (a) refers to the water vapor mass in the wet air per unit volume, that is, the water vapor density in the air, and the unit is 3 or kilogram / meter 3. Absolute humidity is not easy to measure directly, and the actual use is less. If the unit of water vapor pressure is 100 PAS, the unit of absolute humidity is 3 per kilogram / meter, then the relationship is: T is the temperature.
Relative humidity (f) refers to the ratio of the vapor pressure e of air to the saturated vapor pressure E of the same temperature. It is expressed as a percentage: relative humidity indicates the degree of air saturation. When f=100%, the air has reached saturation; when unsaturated, f<100%; over saturation f > 100%. The relative humidity is not only related to the water vapor content in the atmosphere, but also decreases with the increase of temperature.
2. relative humidity
At the same temperature, the ratio of water vapor content to the saturated vapor content in the air.
It is explained in detail that the relative humidity of wet air is P and T at temperature. The relative humidity of wet air refers to the ratio of mole fraction of water vapor in a given moist air to the saturated water vapor of pure water surface under the same temperature T and pressure P, expressed in percentage.
Relative humidity is the ratio of two pressure values:%RH = 100 x p/ps
Where p is the actual part of the pressure environment of the water vapor saturation pressure value; PS is around the water environment value, the relative humidity sensor is usually calibrated in the standard room temperature conditions (above 0 degrees), accordingly, usually think this sensor can indicate the relative humidity in all temperature conditions (including below 0 degrees), steam pressure conditions will produce the liquid water below the ice. Therefore, when liquid water appears in the form of ice, condensation occurs when relative humidity is less than 100%.
3. relative humidity balance
The hygroscopic substance will strive to maintain the balance between its own humidity and the ambient humidity. Water in the matter produces water vapor pressure (PM) on its surface, and water in the surrounding atmosphere produces vapor pressure (P). If PM is the same as P, the relative humidity is balanced between the substance and its environment. Any difference between PM and P produces moisture exchange, resulting in a change in the moisture content of the material until the relative humidity is reached. Therefore, the relative humidity of the substance is defined as the relative humidity in the ambient atmosphere that will not cause the exchange of moisture. (the humidity of the atmosphere must be greater than the humidity of the substance)
