When refrigerant is in a single phase (vapor or liquid), the total inventory in a pipe segment can be accurately determined. Estimating the inventory for piping with mixed phase refrigerant is much more difficult.
The “Two Phase” option requires an overfeed ratio, and is meant for use with overfed evaporators.
The “Condenser Drain” option requires a liquid percentage to indicate what percentage of the pipe is stacked full of liquid. This option could also be used for piping sections where there is an unexpectedly high level of liquid in what is normally two phase piping.
Note: the pipe size is presented as a Nominal Size, in inches, and a Schedule Number, in accordance with ASME Standard B36.10M.
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