Refrigerants

Several of our customers have used Multiflash to determine the properties of refrigerants. A number of pure refrigerants were added to our INFODATA databank several years ago and more recently in our CSM model. We have also fitted data for a large number of refrigerant mixtures and the BIPs have been stored in the INFOBIPS databank. For mixtures we have used the RKSA model to determine the thermodynamic properties of the mixture except for the liquid volume/density which is calculated using the ideal solution model. This model combination has been included in a model configuration file called refrig.mfc.

To determine the properties of any refrigerant mixture, first load refrig.mfc using File/Load problem setup. The refrigerant mixture can then be defined as normal using Select Components and providing the composition. However, there are several well defined refrigerant mixtures which have been allocated refrigerant numbers e.g. R407A. This is a mixture of the pure refrigerants, R32, R125 and R134A, with a fixed composition (in mass percentages) of 20/40/40. To help our users we have set up .mfl files defining components/compositions for

• R401A
• R401B
• R401C
• R402A
• R402B
• R404A
• R405A
• R406A
• R407A
• R407B
• R407C
• R407D
• R407E
• R408A
• R409A
• R410A
• R411A
• R411B
• R414B
• R417A
• R500
• R501
• R502
• R503
• R504
• R507A
• R508A
• R508B

To determine the dew point properties of R407A

Load refrig.mfc

Load R407A.mfl

Specify pressure, e.g. 25 bar or 25e5 Pa

Click on the P, Dew point flash icon or menu item

And the results will be displayed in the results window

Dew point at fixed P: