Refrigerant

Jardo · August 29, 2012, 19:27

Hello, I would like to ask, how can I work with refrigerant in CFX. For example, I want to work with refirgerant R410a. How is it possible? Thank you for your answers

evcelica · August 29, 2012, 21:35

Well, what do you want to do with the refrigerant? what physics are you simulating?

Jardo · August 30, 2012, 04:21

I would like to compare two refrigerants (CO2 and R410a) flowing in bend. I am writing an article about pressure losses in cooling system and I want to compare these refrigerants.

ghorrocks · August 30, 2012, 07:22

If it is just single phase and incompressible then the only important parameters are density and viscosity. A simulation to compare them is straight forward - and probably unnecessary. You can probably work out a Re number for both flows, which leads to friction factors and then pressure loss - this is all empirical so does not require CFD. But it does not generate as many colourful pictures as a good CFD analysis.

If it is multiphase it is a bit more complex than that....

mat_cfd · August 31, 2012, 08:30

You can look into Real fluid properties in Solver: modelling help for using refrigerant. I am also reading abt it and havnt used it before. Its not quite clear how to set up Acentric factor for pulling in saturation curve. If sbdy through more light into it or have come across any tutorial in this regard, pl share the same.

ghorrocks · September 1, 2012, 08:25

Before going into details of the complex material properties for refrigerants like this, first work out whether it is required. If the purpose of the analysis is just to compare the flow losses of two pipe bends for a single phase then none of the saturation curve stuff is required and just density and viscosity is all that is required.

August 29, 2012, 19:27	Using Refrigerant in CFX	#1
Jardo New Member Jaroslav Šustek Join Date: Aug 2012 Posts: 2 Rep Power: 0	Hello, I would like to ask, how can I work with refrigerant in CFX. For example, I want to work with refirgerant R410a. How is it possible? Thank you for your answers Last edited by Jardo; August 29, 2012 at 20:05.

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August 29, 2012, 21:35		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,186 Rep Power: 23	Well, what do you want to do with the refrigerant? what physics are you simulating?

August 30, 2012, 04:21		#3
Jardo New Member Jaroslav Šustek Join Date: Aug 2012 Posts: 2 Rep Power: 0	I would like to compare two refrigerants (CO2 and R410a) flowing in bend. I am writing an article about pressure losses in cooling system and I want to compare these refrigerants.

August 30, 2012, 07:22		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	If it is just single phase and incompressible then the only important parameters are density and viscosity. A simulation to compare them is straight forward - and probably unnecessary. You can probably work out a Re number for both flows, which leads to friction factors and then pressure loss - this is all empirical so does not require CFD. But it does not generate as many colourful pictures as a good CFD analysis. If it is multiphase it is a bit more complex than that....

August 31, 2012, 08:30		#5
mat_cfd New Member Join Date: Oct 2011 Posts: 20 Rep Power: 15	You can look into Real fluid properties in Solver: modelling help for using refrigerant. I am also reading abt it and havnt used it before. Its not quite clear how to set up Acentric factor for pulling in saturation curve. If sbdy through more light into it or have come across any tutorial in this regard, pl share the same.

September 1, 2012, 08:25		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	Before going into details of the complex material properties for refrigerants like this, first work out whether it is required. If the purpose of the analysis is just to compare the flow losses of two pipe bends for a single phase then none of the saturation curve stuff is required and just density and viscosity is all that is required.