BuehlmannL16A: Decompression model ZH-L16A

In scuba: Diving Calculations and Decompression Models

Decompression model ZH-L16A

Description

The parameters of the decompression model ZH-L16A developed by Buehlmann.

Format

A data frame giving the following parameters for each compartment:

id	compartment name (1, 1b, 2, ..., 16)
halftime	Nitrogen halftime (minutes)
a	parameter a in ata (atmospheres absolute)
b	parameter b (dimensionless)

Details

This dataset contains the tissue parameters of the decompression model ZH-L16A.

Buehlmann's decompression model ZH-L16A is a pure diffusion (Haldane-type) model consisting of 17 tissue compartments. Nitrogen in the breathing gas diffuses in and out of each compartment at a rate governed by the halftime for that compartment. The maximum tolerable nitrogen tension in a compartment, when the ambient pressure is P atmospheres absolute, is

Ptol = a + P/b

where a and b are values intrinsic to the tissue. Thus, for a no-decompression dive at sea level, the nitrogen tension in each compartment must not exceed the value a + 1/b for that compartment.

The dataset BuehlmannL16A is a table giving the values of a and b for each of the 17 tissue compartments.

Decompression calculations

The dataset BuehlmannL16A is just a table of numbers. It cannot be used directly for decompression calculations, because the scuba package does not recognise it as a decompression model (object of class "hm").

To perform decompression calculations with the ZH-L16A model, use the functions haldane or showstates with the argument model="ZH-L16A" (or just model="Z").

To convert a table of a and b values, such as the table above, into an object of class "hm" representing a decompression model, first calculate the M-values M0 = a + 1/b and dM = 1/b, and then pass the values M0, dM to the function hm.

Author(s)

\adrian

.

Source

Buehlmann et al (2003), Table 25, page 158.

References

Buehlmann, A.B., Voellm, E.B. and Nussberger, P. (2002) Tauchmedizin. 5th edition. Springer-Verlag, Berlin. ISBN 3-540-42979-4.

See Also

Workman65

scuba documentation built on Oct. 18, 2022, 5:06 p.m.