-1
$\begingroup$

I am trying to make DIY Bubble CPAP that can put a constant pressure on patient. I am using an Aquarium Oxygen pump as air source. The motor says 38L/Min in the spec. And by googling I found that an average adult can takes up to 7L/min air while resting. But when I used it, I felt like I am getting very low air flow.

Can anyone help, what am I missing?

Incase you there is any suggestion please drop it too. Thank you.

$\endgroup$
5
  • 1
    $\begingroup$ 7l/min? That seems low, perhaps 4 to 7 litres per breath and then how many breaths per minute? $\endgroup$
    – Solar Mike
    Commented Apr 23, 2020 at 14:28
  • $\begingroup$ Yeah, Wikipedia has average adult lung capacity at around 6 liters, so Solar Mike's comment is probably correct. $\endgroup$
    – Wasabi
    Commented Apr 23, 2020 at 14:30
  • $\begingroup$ I think I made a mistake. The link below says 7-8 Litres of Oxygen But it's not just pure Oxygen. There are other airs too. sharecare.com/health/air-quality/oxygen-person-consume-a-day $\endgroup$ Commented Apr 23, 2020 at 16:23
  • $\begingroup$ It would be an idea to make sure you get this right before you kill yourself or someone else. $\endgroup$
    – Solar Mike
    Commented Apr 23, 2020 at 17:49
  • $\begingroup$ I held the mask with hand. So when the airflow was low, I could easily remove the mask and breathe. $\endgroup$ Commented Apr 23, 2020 at 17:57

1 Answer 1

1
$\begingroup$

A medical device known as an incentive inspirometer measures volume of air inhaled. Twenty years ago, I could pull five liters (was serious cyclist) but now I'm down to four liters per breath. Sixteen breaths per minute means sixty-four liters per minute.

At the five liter value, that's eighty liters per minute, in resting state.

incentive inspirometer image

$\endgroup$
2
  • $\begingroup$ I did an exercise with students to show how much air they used per minute and compared the total to the volume of air in the room - explaining the reasons for ventilation in rooms & buildings. Used party balloons - they had to blow them up with 4 breaths, then we approximated the volume from the diameter and divided by four... A fun exercise. $\endgroup$
    – Solar Mike
    Commented Apr 23, 2020 at 15:57
  • $\begingroup$ Thank you, I think I am heading in the right direction. The source where I found 7L/min was actually total Oxygen per minute. So the total air in litre will be much more. Which is around 80L/Min the amount you mentioned. Thank you $\endgroup$ Commented Apr 23, 2020 at 16:27

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.