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Thread: Controlling of RH and temp of air.

  1. #1 Controlling of RH and temp of air. 
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    Hi,

    I am trying to provide a humid air stream along some tubing, where I can roughly control the relative humidity and temperature, this doesn't need to be exact.

    I already have a compressed air tank, regulator and flow meter to provide the correct flow rate.

    I need to find out whether bubbling air through water will result in 100% relative humidity? and whether or not this depends on the the length of exposure to water/size of bubble etc?

    If so can I heat the water to get the right amount of moisture in the flow stream at 100% humidity and then heat the air further in the outlet pipe in order to lower the relative humidity and get the temperature I require.

    Please excuse my ignorance as I do not have an extensive knowledge of this subject, any help or guidance you can give me will be greatly appreciated.

    Cheers,
    Rob.


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  3. #2  
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    Do you only care about the relative humidity or do you also care about the temperature? Doing it that way, you might end up with a rather high temperature to get the RH you want. Another way to do it would be to start out with some warm moist air. If it's a muggy day, you might not even have to add any moisture. Then cool it with an air conditioner. The outlet temperature of the air conditioner would be the dew point temperature of the air. Then you could heat it up to the final temperature to get the RH you want.


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  4. #3  
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    Quote Originally Posted by Harold14370 View Post
    Do you only care about the relative humidity or do you also care about the temperature? Doing it that way, you might end up with a rather high temperature to get the RH you want. Another way to do it would be to start out with some warm moist air. If it's a muggy day, you might not even have to add any moisture. Then cool it with an air conditioner. The outlet temperature of the air conditioner would be the dew point temperature of the air. Then you could heat it up to the final temperature to get the RH you want.
    Hey Harold,

    Thanks for your reply. Yeah I am trying to recreate conditions for some ex-situ automotive testing on a very small component. Preferably having some control over both.

    I have two testing conditions I'd like to achieve. If I were able to get the RH between 60-75% at 40 and 70 degrees C (+/- 5 Degrees) that would give me a good indication if my designs will work in real conditions.

    Cheers,

    Rob.
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