Modeling a demand constant volume ratio exhaust and a self-mixing constant oxygen injection semi-closed rebreather
(English)Manuscript (preprint) (Other academic)
Unmanned tests of two types of gas dosage techniques for semi-closed underwater rebreathing apparatuses were carried out with a metabolic simulator in a water filled pressure chamber. Tests were conducted over a wide range of tidal volumes (0.5-3 L), respiratory frequencies (5-25 min-1), and oxygen consumptions (0.5-4 L/min), as well as with changing chamber pressures from 100 kPa to 920 kPa. Two models were set up, one single compartment model and one model assuming multiple serial compartments. Both models seem to have about the same level of accuracy at predicting the inspired oxygen levels at pressure, but the surface tests seem to favor the serial compartments model.
Other Medical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-172948OAI: oai:DiVA.org:kth-172948DiVA: diva2:850843
QS 20152015-09-022015-09-022015-09-03Bibliographically approved