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Practical use of the bioweapon defense mode feature

Discussion in 'Model X' started by satheesh.net, Dec 16, 2015.

  1. satheesh.net

    satheesh.net Member

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    So I'm curious to know a little about the practical use of the bioweapon defense mode feature. How often do you need to service it? Can I enable it all the time? Like, why would I not use it for everyday driving? Is it costly to swap and how often do you actually need to replace it? There are a lot of unknown factors related to this feature, so hopefully someone here may fill in the gaps.

    Video of Elon explaining the HEPA filter and bioweapon defense mode:
    Elon Musk launches Tesla Model X (9.29.15) - YouTube
     
  2. ecarfan

    ecarfan Well-Known Member

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    We don't know the answer to your questions yet, but I am sure many people would like to know the answers as well.
     
  3. Vitold

    Vitold Member

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    Cars are big source of pollution and you are sitting right in the middle of it. These days I turn on recirculate in bumper to bumper traffic, therefore, if I had bio-defense mode I'd use it everyday.

    Life of a filter depends on quality of air it filters plus life of HEPA will depend on quality of prefilter as well. I would expect prefilter needed changing every 3-6 months and 1-2 years for HEPA.
     
  4. DriverOne

    DriverOne Member

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    It sure would be nice to be free of airborne allergens (cedar, mold, ragweed, grass pollen), at least while driving.
     
  5. FarmerDave

    FarmerDave Member

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    In my rural area skunk roadkill is a good reason for the HEPA filter.:smile:
     
  6. Dwdnjck

    Dwdnjck Member

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    Harris Ranch?
     
  7. favo

    favo Model 3 Reservation Holder

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    Elizabeth, NJ?
     
  8. satheesh.net

    satheesh.net Member

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    I know we don't yet have all the answers. But that's why we can speculate. :smile:

    I'm pretty sure I'll be using the bio-mode quite often or maybe all the time. (Depending on the cost for service/replace that is...)
     
  9. Mjølner

    Mjølner Member

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    I`m not quite sure how, and if this will work. The door/sealings are the same as at the Model S, and we all know how dense they are!!!
     
  10. satheesh.net

    satheesh.net Member

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    When the doors of the TMX closes you can almost feel like you get sealed in somehow. A little difficult to explain, but it feels very secure, robust and almost airtight. Since they have tested if they could detect any spores/bacteria and failed, I'm assuming the car is quite airtight. But we'll see, a sales gimmick and practical use are two different things. :wink:
     
  11. Saghost

    Saghost Active Member

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    There's a lot we don't know, so far. I may be mistaken, but the way I understood the presentation, bioweapon defense mode is basically a slight cabin pressurization.

    I'm pretty sure the car uses the HEPA filter for HVAC air at all times, which should be enough to prevent most issues.

    To pressurize the cabin, they need to run the fan faster/harder and restrict the exhaust. Presumably this means somewhat more energy use, but unless the fan motor overheats that should be the only impact (possibly a marginally shorter filter replacement interval if the air is pretty dirty.)
    Walter
     
  12. Chickenlittle

    Chickenlittle Active Member

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    How about China where they need to close schools on days with severe pollution or close factories when international athletic games are to be played
     
  13. AudubonB

    AudubonB Mild-mannered Moderator Lord Vetinari*

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    Other HEPA filters I use, like the asbestos removal-certified one in my Festool shop vac, have easily-accessible and user-serviceable filters for cleaning. Same goes for the half-score of room vacuums we have for our lodge. Any answer to this thread's main question is also going to hinge on whether Tesla has made owner-servicing of this filter easy, hard, or fuggeddaboutit.
     
  14. Tam

    Tam Active Member

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    1) How often do you need to service it?

    I assume yearly at least.

    2) Can I enable it all the time?

    I assume yes. That's what it is designed for.

    3) Why would I
    not use it for everyday driving?

    a) You might not want to use it if you enjoy nature's air more than artificial filtered air.

    b)
    I don't know how quiet and stealthy the Bioweapon Defense mode is but even in a conventional A/C, pushing MAX mode can be annoying because of its noise and the impression that the system is overworked/overloaded.

    4) Is it costly to swap?

    Pricing is unknown but there's no doubt that the components with larger area and with activated charcoal are more expensive than plain conventional ones.

    5) How often do you actually need to replace it?

    I assume at least yearly.



     
  15. cantdecide

    cantdecide Member

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    My expectation from what Elon said in Fremont was that there are 2 concepts here:
    1) the air filter that is used is a HEPA filter and is always used when the fan is running. Generally cleaner air all the time.
    2) bio defence mode is a mode where everything is optimized... Fan at maximum, positive pressure, etcetera. Basically similar to how front window defrost takes over the HVAC to optimize for clear windows.

    As such I suspect that you don't normally need to use bio defense mode... Just use the HEPA filter and have the fan on auto and the air will be clean.
    If you have the windows down and get skunked... Then maybe turn on bioweapons defense mode for a minute.
     
  16. vankie

    vankie Member

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    if you drive one in Beijing/Shanghai, my guess is you'd want to have the bio defense mode on at least 1/3 of the time you drive. That's about how often the air quality is forecast to be "hazardous". so, clearly, a powerful marketing message for that market.
     
  17. 3s-a-charm

    3s-a-charm Active Member

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    One of the most disgusting things is when I am accelerating up a large hill in my Model S and all the ICE vehicles are spewing more than the usual amount of stink from their mufflers - the smell is horrendous. This is when I often think of the Model X filtration system and think about it coming in very handy in this situation.

    Also, I'm sure there are a number of parents out there with kids who have severe allergies who will buy a Model X simply for this reason. I see parents buy homes based on the materials used in the home (allergen free homes) and spending 10-20% more on a home because of this. People spend big bucks to avoid allergens.
     
  18. Saghost

    Saghost Active Member

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    As mentioned above by a couple of us, I think you're mis-understanding bioweapon defense mode. I'm pretty sure the car will always be drawing its fresh cabin air through the HEPA filters, whether in normal or bioweapon mode.

    The difference is that bioweapon mode pressurizes the cabin slightly, so that any leakage around the door and window seals will be outwards. Useful if you have a high risk from a 1 ppm concentration of something that's currently outside which the filter will capture (like say a bioweapon - though to be truly effective there you need to already be in the car when the risk starts, and have a plan to decontaminate the outside of the car before you get out.)

    The slight overpressure will be irrelevant in normal operation, especially in places where the air that you exchanged when you opened the doors is the same as the air you're protecting against - Tesla gave you good tight seals on the windows and doors already, it's not like there will be big drafts of bad air coming in.
    Walter
     
  19. ptsagcy

    ptsagcy Member

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    If anyone has ever driven through any of the NY/NJ tunnels you will totally understand the need for Biodefense Mode.:redface:
     
  20. MrBoylan

    MrBoylan Member

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    Noxious odors don't always originate outside the cabin. 'Nuf said.
     
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