Brett wrote:
What excess air? The Carbon Dioxide scrubbers are literally removing the co2 molecules from the air this by reducing the pressure of the co2 gas in the cabin you are reducing the entire collective pressure of the air in the cabin as well. This would be then compensated by adding in extra oxigen gas. The important part of this kind of system to remember is that you are converting the co2 you produce into a solid thus removing it from the air entirely. There should be no excess air only the non gaseous biproduct that is left in the scrubbers, which has little effect on the cabin pressure. There is nothing to pump or vent out unitil you reach the surface where, if you were not very careful in the controlling of o2 input, you may want a valve to equalize the pressure before opening the hatch. There should be no need to store any gasses in tanks or vent them into water.-----Original Message-----
From: DBACKIDS@aol.com <DBACKIDS@aol.com>
To: personal_submersibles@psubs.org <personal_submersibles@psubs.org>
Date: Sunday, May 05, 2002 7:19 PM
Subject: Re: [PSUBS-MAILIST] pressure hull sizing
It seems that whether you put the excess air into a tank, or vent it (which seems a better idea), you will still need a pump, because as Adam said, the surrounding pressure also increases. A valve would only equalize the pressure, would it not?