How filters works?

[[RU]Nner]

In my opinion filters must clear air from carbon dioxide when air generator out of oxygen and nitrogen to prepare air mix. E.g.: when air generator works fine - filters must be offline. If air generator out of components - filters start to work and try to hold air quality on same level (until it works fine).
But in game oxygen used when generator works and same oxygen used for filters. Maybe i missed something?

[Zorz]

filter use oxygen and generator use a oxygen/nitrogen mix, because pure oxygen is not good for humans ;)

[CheeseJedi]

The current Air Filtering system works, as I understand it, by using the panel filters as the CO2 scrubbers, plus the resource injector is used to add small amounts of O2 to replenish that which has been used/converted to CO2.

Oxygen usage here should be relatively minimal, unless you have a large base, a base with lots of active players in it or a breach/fire etc. You can check the hull integrity for the module/ship you're in on one of the environment screens.

This may have changed, but in case it hasn't:

The Air Filter activates when the air quality drops below 90% and attempts to restore the air quality to 100% by filtering and adding small amounts of O2 before going back in to standby mode

The Air Generator uses both Oxygen and Nitrogen to generate new air; currently in a 20% O2 / 80% N2 ratio and activates when the air pressure drops below 90% and attempts to restore the pressure to 100% / 1 BAR before returning to standby mode.

Note also that if the Air Filter is non-functional, the Air Generator will kick in and generate new air if the air quality drops below 60%, as an emergency back-up to restore life support.

Additionally, an airlock that has insufficient air in it's tank when a pressurisation request that can't be met will trigger the Air Generator to generate new air to complete the airlock cycle.

I hope these figures are still correct! :)

[[RU]Nner]

yep, but pure oxygen used in suits (strange) and can be refilled by pure oxygen from small tanks (also, as i remember, in soyuz-apollo mission on apollo astronauts use pure oxygen and on soyuz use air mix thats why there was a little poblem with gate (astronauts need some time to adaptate after pure oxygen breathing ))

[[RU]Nner]

Originally posted by CheeseJedi:

The current Air Filtering system works, as I understand it, by using the panel filters as the CO2 scrubbers, plus the resource injector is used to add small amounts of O2 to replenish that which has been used/converted to CO2.

Oxygen usage here should be relatively minimal, unless you have a large base, a base with lots of active players in it or a breach/fire etc. You can check the hull integrity for the module/ship you're in on one of the environment screens.

This may have changed, but in case it hasn't:

The Air Filter activates when the air quality drops below 90% and attempts to restore the air quality to 100% by filtering and adding small amounts of O2 before going back in to standby mode

The Air Generator uses both Oxygen and Nitrogen to generate new air; currently in a 20% O2 / 80% N2 ratio and activates when the air pressure drops below 90% and attempts to restore the pressure to 100% / 1 BAR before returning to standby mode.

Note also that if the Air Filter is non-functional, the Air Generator will kick in and generate new air if the air quality drops below 60%, as an emergency back-up to restore life support.

Additionally, an airlock that has insufficient air in it's tank when a pressurisation request that can't be met will trigger the Air Generator to generate new air to complete the airlock cycle.

I hope these figures are still correct! :)

Thanks for explanation =)

[CheeseJedi]

Originally posted by DerLord:

yep, but pure oxygen used in suits (strange) and can be refilled by pure oxygen from small tanks (also, as i remember, in soyuz-apollo mission on apollo astronauts use pure oxygen and on soyuz use air mix thats why there was a little poblem with gate (astronauts need some time to adaptate after pure oxygen breathing ))

It's plausible to think that the suits in Hellion have some 'built-in' nitrogen (it is inert, after all) and that the oxygen is used by a similar filtering system to the life support in the ships/modules - the only missing part being CO2 scrubber panels being part of the jetpack/suit combo.

Edit: By this I'm implying that our characters are still breating an 80/20 mix in the suits, just the N2 is not lost, the CO2 removed, and O2 added.

[Zorz]

you produce nitrogen by breathe oxygen in the suit

[Dingo]

I'm gonna necro the **** out of this post, because i'm impulsive and i can't help myself :)

Earth atmospheric pressure is roughly 100kpa, only about 1/5th of air (by mass) is oxygen, it means that if you bring earth-like air in space, 80% of it will literally be wasted dead weight.

From what i was told, Ruskies used oxygen/nitrogen mix to reduce chance of fire. I guess it worked for them, because except one kosmonaut that died in oxygen fire (on the ground during long term experiment), they never really had out of control fire on a spacecraft.

Nitrogen is an inert gas, and you can probably beat out small fire in earth atmosphere with your suit glove. In pure oxygen that same fire will be like a blow torch.

Yanks, used pure oxygen, but at 50% pressure. This itself does not increase the risk of fire, it just makes things much worse if there is one. They paid for it dearly when Apollo 1 command module caught fire on the launch pad during pre-flight testing and 3 astronauts died because of it.

Reducing the pressure and using pure O2 has many advantages. It gets rid of the dead weight gases, lowers the life support power consumption, and increased the life span of CO2 scrubbers.

Low pressure also significantly reduces the weight of crewed modules, because they don't need to hold full 100kPa of pressure in vacuum. It means they can build them out of bits of coat hangers and mylar foil and it will probably be fine :)

The cost for delivering 1kg of payload to low earth orbit, back in Saturn 5 days, was something like $23000 (yes 3 zeros) in today's money. So the Yanks tried to shed off every gram they could. I think i've read somewhere that SpaceX cost for the same 1kg of payload to LEO is something like $200 ... simply because they reuse as much as they can, Apollo program wasn't really big on reusing stuff, everything was one off, single use, custom build :)

There is no reason for special procedure when you go from 50kPa pure oxygen to 101kPa 80/20 N2/O2.

Going from full pressure atmospheric mix to low pressure oxygen, you have to give the nitrogen in your blood the time to cycle out of your blood (by breathing it out as the pressure slowly falls). If you don't the nitrogen forms bubbles in your circulatory system and you get decompression sickness, that is quite painful, and it can actually kill you.

humans can survive (few hours, maybe even days) in 12.1kPa pure oxygen atmosphere, and long term just fine on 50kPa as long as the oxygen content is high enough.

There is no nitrogen in space suits, and the simple reason is humans don't require anything but oxygen to breathe, there is no plus to having nitrogen (or any other gas) in space suits, so why waste the space.

@Zorz .. you produce CO2 when breathing, not N2 ..