air final velocity
air final velocity
(OP)
Hi there
Hope somebody can help me
Following is the problem
I have a mass of air that is passing through a dehumidifier.
given
section
air mass flow,
air inlet temperature
air inlet RH
water condensed
outlet air temperature
outlet air RH
I am asked about the air outlet velocity
Because of moisture removal from the coil, I assume that outlet mass flow is not as inlet mass flow, I was thinking to realize a balance of mass as follows
inlet mass flow - condensed water mass flow = outlet mass flow
from outlet mass flow, outlet conditions I can derive the air outlet velocity.
please, can anybody confirm my guess is correct ?
thanks in advance
Hope somebody can help me
Following is the problem
I have a mass of air that is passing through a dehumidifier.
given
section
air mass flow,
air inlet temperature
air inlet RH
water condensed
outlet air temperature
outlet air RH
I am asked about the air outlet velocity
Because of moisture removal from the coil, I assume that outlet mass flow is not as inlet mass flow, I was thinking to realize a balance of mass as follows
inlet mass flow - condensed water mass flow = outlet mass flow
from outlet mass flow, outlet conditions I can derive the air outlet velocity.
please, can anybody confirm my guess is correct ?
thanks in advance





RE: air final velocity
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RE: air final velocity
Please, may I ask you to be more specific ?
I am afraid I can't get the solution you are kindly proposing me.
Thanks
RE: air final velocity
RE: air final velocity
Please, may I expect the velocity to be lower than inlet one ?
Many thanks
RE: air final velocity
RE: air final velocity
for sure I have done the math.
Since I have found a result, I am just wondering if the result is reasonable or not.
For this I am asking to the forum.
Should I already know the method, I would not post the question, but maybe answering to a similar post, wouldn't I ?
Thanks in advance !
RE: air final velocity
If you want guesses I'll guess.
Velocity is a volume function.
Water vapor is less dense than air, so removing moisture will increase density.
Dehumidifiers typically work by cooling the airstream and cold air is more dense than warm air.
So it stands to reason that the net result of both processes will be a density increase and mass decrease.
Density is mass/volume, or rearranging Volume is mass/density.
Numerator decreasing and denominator increasing makes a smaller number for volume.
Velocity is volume / time / area.
Assuming constant area it follows that velocity will get smaller.
OK, it's not really a guess.
RE: air final velocity
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