How to set Diameter units in MSX to meters

G'day Team,

Can someone please tell me how to change the MSX units for the pre-defined term 'D' from feet to meters?

The MSX Manual states that Diameter can either be in Feet or Meters, however no-where does it say how to change it or what the unit selection is based on.

I have the Area units set to M2, which I thought would have set the MSX to use meters for D, however it's still using feet.

Context:

I'm back after 4 years trying to solve the problem of modelling wall decay in MSX. It had fallen off my priority list before I was able to get it to work last time but here I am again.

I intend to model two wall decay theories, EXPBIO (referenced in this previous query) ( RE: How to include Mass Transfer Coefficient into MSX )  and first order. The first order method still needs to be done in MSX to incorporate bulk decay modelling.

Yashodhan provided a great answer to the EXPBIO query outlining how the STEP function can be used to select between different equations here: Adding custom parameters and equations with Multi Species Extension (MSX) . However please note that he states that the equations used in that example are indicative only, they don't combine wall decay with bulk decay correctly.

P.S.

If anyone can also explain how the 'Wall Species' in WaterCAD MSX works it would be greatly appreciated. I ran a test model where I simply set the wall species RATE to 1 (e.g. RATE W 1) and the results make no sense to me whatsoever. 

Thank you,

Ryan Catling

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