When compressed nitrogen enters a room
When compressed nitrogen enters a room
(OP)
Can anyone please advice the impact when compressed nitrogen at an absolute pressure of 3 bar, -50deg C dew point entering a room (atmospheric pressure, 20 deg C 45% RH) at a volume flow rate of 72CMH.
Is this consider a polytropic expansion process?
Any help would be greatly appreciated.
Is this consider a polytropic expansion process?
Any help would be greatly appreciated.





RE: When compressed nitrogen enters a room
Use of the polytropic equations should be limited to quasistatic processes where Pv**n=constant.
RE: When compressed nitrogen enters a room
Nitrogen gas is a dangerous asphyxiant and filling a room with nitrogen is very unsafe. Would you tell us why you are asking your question?
In any event, as mentioned in the previous response:
(1) if the nitrogen gas is initially below its Joule-Thomson inversion temperature (348 deg C at atmospheric pressure and somewhat different at 3 bar of pressure) and
(2) the gas enters through a throttling valve that does not allow much heat transfer and does no mechanical work
then you have a constant enthalpy expansion (called a Joule-Thomson expansion) and the gas will be cooled.
Looking up the Joule-Thomson coefficient at the pressure and temperature of your nitrogen gas (and you haven't told us the gas temperature), and then calculating the temperature change is a tedious job. Ask a consulting chemical engineer to do it for you.
Milton Beychok
(Visit me at www.air-dispersion.com)
.
RE: When compressed nitrogen enters a room
RE: When compressed nitrogen enters a room
Thanks again for the help. Appreciate it.