- #1
Euan Foster
- 1
- 0
Hey all,
As environmental physics isn't my forte, I have a problem that has been annoying me for about a month now at work and I am still getting no where with it... so any help with this head ache is much appreciated. The problem at hand is as follows.
A sealed metal housing is purged with 100% dry air until the dew point of the internal environment is -40 deg C. However, the seals on the unit are far from perfect and let in a known amount of water per day for a given environment, call it 1E-6 grams of water per day. The volume of the internal environment contained within the housing is known to be 0.003 m^3. The temperature and pressure of the environment is constant at 30 deg C and 101325 Pa.
At the end of one day, what is the relative humidity inside the metal housing?
I would prefer if any answers to this use formulas/theory as much as possible and refrain from using psychometric charts and steam tables. I am trying to repeat this over a large range of values on excel/matlab so repeat ability is key... unless someone knows of any psychometric chart resource already tabulated so that values can be searched for?
I am probably missing something terribly simple, but as mentioned any help will be much appreciated.
Looking forward to hearing any responses
Regards,
Euan Foster
As environmental physics isn't my forte, I have a problem that has been annoying me for about a month now at work and I am still getting no where with it... so any help with this head ache is much appreciated. The problem at hand is as follows.
A sealed metal housing is purged with 100% dry air until the dew point of the internal environment is -40 deg C. However, the seals on the unit are far from perfect and let in a known amount of water per day for a given environment, call it 1E-6 grams of water per day. The volume of the internal environment contained within the housing is known to be 0.003 m^3. The temperature and pressure of the environment is constant at 30 deg C and 101325 Pa.
At the end of one day, what is the relative humidity inside the metal housing?
I would prefer if any answers to this use formulas/theory as much as possible and refrain from using psychometric charts and steam tables. I am trying to repeat this over a large range of values on excel/matlab so repeat ability is key... unless someone knows of any psychometric chart resource already tabulated so that values can be searched for?
I am probably missing something terribly simple, but as mentioned any help will be much appreciated.
Looking forward to hearing any responses
Regards,
Euan Foster