You do realize that using B to pressurize A on the return leg will pressurize it not to (Phab-Pmars/2) but ((Phab-Pmars/2)/2) IE 1/4 of hab pressure, not 1/2 of hab pressure right? That leaves you with 3/4 of the Phab pressure to make up from the gas you pumped out of the lock on exit and storage or by pumping it back into A from B and the rest from storage.Īt best you can schedule some of the pumping energy needed to pressurize and de pressurize the locks. This would be a good way to conserve indoor air, which is expensive to create on Mars. If we are employing a double lock system as suggested here, we would be using indoor air from airlock 1 to refill airlock 2, etc. We can't be sure of operating conditions at all times, so it might be good practice to pump out as much outdoor air as we can before refilling the airlock with indoor air, not co2. If the indoor volume were say 10 times airlock volume then it might not take too many airlock openings to reach 1pct. If the airlock contains Martian air at 96 pct co2 but the pressure is raised 20 times to match the inside air then when the interior door is opened, the amount of co2 entering may be signicant. But if the indoor space is small, say a small garage for 1 or 2 vehicles then we may have a concern. So if the indoor volume is 100 times the volume of the airlock, I wouldn't worr about it. One function of the ECLSS system for the indoor space is to remove co2 from breathable air. So whether or not the co2 in an airlock is a problem will depend on specific circumstances.įirst, is the airlock volum significant compared with the indoor space the person will enter. The long term occupational health level is set to 0.5 pct in the US. We don't usually think this way, but co2 above 1 pct is toxic to humans. When entering back only half of what is in B needs to be pumped back to A as half air pressure would flow fro high pressure to low, B to A. Using two airlocks only half the air pressure is pumped when exiting, the rest is done by high pressure to low pressure flow between the two airlocks. Door is opened in A to hab and person returns to prep area. A vacuum hose and attachment like from a shop vac is used to vacuum the dust off the persons suit and inside airlock A helping keep dust out of the hab. Then air ( hab air N2/O2 from air tank ) is let back in till it has the same air pressure as hab. Valve is closed and another valve is opened using using a vacuum pump to send the rest of the air from B back to A ( B is then near vacuum ), valve closes and pump turn off. Valve between A and B is opened and air flows back from B to A till they have the same pressure. Valve is opened and pump takes the air pressure down to near vacuum sending the CO2 back to the outside ( helps keep CO2 out of A and hab ). When person is ready to reenter A is ready. Valve in A is opened to Mars outside letting in air ( CO2 ) till A has same pressure as out side, valve is closed and door to outside is opened and persons walks out. Valve in A opens and air is pumped into air tank till A is near a vacuum ( saves N2 and O2 ). Valve opens to airlock B and air flows to B until both have the same pressure ( no energy needed except to open and close valve ). B is ready for people or equipment returning from outside. Air pressure in airlock B is at Mars atmospheric pressure for that location.Ī is ready for people or equipment to enter from hab.
Air pressure in airlock A is at habitat air pressure.
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