Does temperature affect the pressure dew point?
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Dear experts, I would like to ask that in a drying system, the temperature at the outlet of the adsorption dryer is 20°C, and a certain pressure dew point value is measured. Since it is winter, the temperature of the compressed air drops after traveling a certain distance; will the pressure dew point measured at the downstream end change as well?
There is a change; theoretically, as the temperature drops, the dew point also decreases
Dew point is merely a reflection of the drying efficiency of the dryer, indicating the water content in the gas. It has no significant relationship with atmospheric temperature, but it is related to atmospheric humidity. Also: Please first describe your process. Is it (air — air compressor — demister — dryer)? Is that the sequence? Do you mean that the compressed air temperature is low because it comes directly from the air compressor? Well, this lower temperature facilitates the condensation of water in the air, which helps with drainage, and as a result the dew point decreases.
The process involves an air compressor, a cold dryer, and a desiccant dryer. What I want to know now is whether the dew point of the compressed air coming out of the desiccant dryer decreases after it has traveled a certain distance, given that it is winter
What happens to the compressed air that comes out of the dryer at the back, after it has traveled a certain distance? What distance has been covered? As long as the pipeline isn’t leaking, what does the dew point matter? Why does it decrease?
That’s right! I don’t think so either, but some customers have said that the pressure dew point measured at the back end of the dryer differs from the value measured at the site, 100 meters away. The same portable dew point meter was used, and since it’s winter, the dew point at the back end is lower
The dew point we usually refer to is the temperature at a certain pressure for a specific gas phase composition. In other words, with a constant gas phase composition and pressure, the dew point is unique. As long as the gas pressure remains constant after it exits the dryer, the dew point temperature will not change.
Dew point mainly reflects the water content in the gas; at the same ambient pressure, the lower the temperature, the lower the relative dew point. It’s just a matter of the extent of the impact; think about how a freeze dryer works.
Lower temperatures mean that water condenses, but it’s both cold and dry, so the pressure dew point must be very low; yet water still manages to condense. That’s how cold it gets in winter for you. Haha, but isn’t it bad if it’s too low? A low value means there’s less water in the air