Ask Experts Questions for FREE Help !
Ask
    wreckless192's Avatar
    wreckless192 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Sep 24, 2009, 09:48 AM
    Condensaton - Finding Dew Point Temp
    Hi,
    Hope you can help me with this problem. I have an application where I need to determine the dew point temp. the parameters are as follows:
    - the ambient outside air is between -40F to 122F
    - the ambient humidity is 190.4 gr/lb
    - the ambient pressure is 10.1 to 14.7 psia
    - the temperature inside the duct is between 30F to 112F

    I'm trying to find out at what temperature will condensation form on the outside on the duct. If you can tell me how to determine this (given the humidity in gr/lb) that would be greatly appreciated. I've searched different sites and calculators, but they all have the humidity units in (%).

    Thanks Wreckless192
    [email protected]
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #2

    Sep 25, 2009, 07:16 PM

    That is because gr/lb can be the same at 70 degrees as it is at 80 degreen but the %RH is quite different.

    The more saturated the air is at any given temperature is actuall what determines dew point.

    Even atmospheric pressure will change the air density and the formula for finding the saturation point of air.

    I'm not sure of the formula but it must be something along this line if it helps you search more online. The wieght of dry are at a specific pressure and temperature (probably needs to be found on an engineering chart, or a quite lengthy formula) plus the wait of the water will give you the total density then another long formula or pschometric chart will convert it to RH
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Finding average acceleration and point acceleration [ 1 Answers ]

A car initially traveling eastward turns north by traveling in a circular path at uniform speed as in the figure below. The length of the arc ABC is 260 m, and the car completes the turn in 40.0 s. I need to find the acceleration at a point 35 degrees below the horizontal in terms of vectors I...

Finding point of indifference percentage [ 5 Answers ]

I am trying to find a required rate of return percentage that will make it so I can pick either offer without caring. I have 2 offers One is to receive 252,000 dollars today Two is to receive 100,000 dollars every year for the next four years Currently the required rate of return is 5%. ...

Heat not kicking on until the temp dips below 64 degrees, target temp set to 72 [ 2 Answers ]

Hello, This is my first time posting here, but I figured it was a good place to start for some advice. I just bought a new townhouse a few weeks ago and have been having some heating issues since moving in. The actual furnace (Goodman GMS 8045) was installed in June of '06 while the unit was...

Finding A Boiling Point? [ 1 Answers ]

Given a 10% by mass solution of the compound SCl4 in acetone, what is the boiling point and the osmotic pressure of the resulting solution, which has a density of 1.02 g/mL? Thank you in advance for any help anyone can provide

Temp gauge showing temp, 2001 Chev Malibu [ 13 Answers ]

I have a 2001 Chev Malibu LS, V6, temp gauge is not showing any heat at all, not registering when I know the coolant is hot ? Veh has about 126000 mi on it, never been flushed out, thought I would attempt to flush myself but don't you think the problem might be a bad thermostat ? If so, where and...

View more questions Search