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Modeling a demand constant volume ratio exhaust and a self-mixing constant oxygen injection semi-closed rebreather
KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology.
KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

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.

National Category
Other Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-172948OAI: oai:DiVA.org:kth-172948DiVA: diva2:850843
Note

QS 2015

Available from: 2015-09-02 Created: 2015-09-02 Last updated: 2015-09-03Bibliographically approved
In thesis
1. Oxygen content in semi-closed rebreathing apparatuses for underwater use: Measurements and modeling
Open this publication in new window or tab >>Oxygen content in semi-closed rebreathing apparatuses for underwater use: Measurements and modeling
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present series of unmanned hyperbaric tests were conducted in order to investigate the oxygen fraction variability in semi-closed underwater rebreathing apparatuses. The tested rebreathers were RB80 (Halcyon dive systems, High springs, FL, USA), IS-Mix (Interspiro AB, Stockholm, Sweden), CRABE (Aqua Lung, Carros Cedex, France), and Viper+ (Cobham plc, Davenport, IA, USA). The tests were conducted using a catalytically based propene combusting metabolic simulator. The metabolic simulator connected to a breathing simulator, both placed inside a hyperbaric pressure chamber, was first tested to demonstrate its usefulness to simulate human respiration in a hyperbaric situation. Following this the metabolic simulator was shown to be a useful tool in accident investigations as well as to assess the impact of different engineering designs and physiological variables on the oxygen content in the gas delivered to the diver by the rebreathing apparatuses. A multi-compartment model of the oxygen fractions was developed and compared to the previously published single-compartment models. The root mean squared error (RMSE) of the multi-compartment model was smaller than the RMSE for the single-compartment model, showing its usefulness to estimate the impact of different designs and physiological variables on the inspired oxygen fraction.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. x, 48 p.
Series
TRITA-STH : report, ISSN 1653-3836 ; 2015:6
Keyword
Diving, rebreather, underwater breathing apparatus, unmanned testing, hyperbaric, metabolic simulator, scuba, semi-closed
National Category
Other Medical Engineering
Research subject
Medical Technology
Identifiers
urn:nbn:se:kth:diva-172949 (URN)978-917595-616-9 (ISBN)
Public defence
2015-09-25, D2, Lindstedtsvägen 5, KTH, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20150903

Available from: 2015-09-03 Created: 2015-09-02 Last updated: 2015-09-03Bibliographically approved

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CiteExportLink to record
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