Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

3-Stage Propane Ref Performance

2

Question About Refrigerant Type

propylene or propane as refri

7 replies to this topic
Share this topic:
| More

#1 Araboni

Araboni

    Veteran Member

  • Members
  • 42 posts

Posted 09 October 2017 - 12:35 AM

Dear all We are to design a refrigeration package (incl. Screw compressor) and as per our calculations, both Propane and Propylene work well as refrigerant. But we have experienced that propylene separation from oil can not be done 100% as the propylene is slightly soluble in polyethylene glycol oils. Now I was wondering if anybody has any idea about this issue. regards

#2 Bobby Strain

Bobby Strain

    Gold Member

  • Members
  • 2,226 posts

Posted 09 October 2017 - 09:07 AM

It's probably best to use propane if it fits the application's temperature requirement. My experience is that propylene is used only in processes where propylene is produced. And propane is more readily available than propylene. Probably at a lower cost, too.

 

Bobby



#3 Araboni

Araboni

    Veteran Member

  • Members
  • 42 posts

Posted 10 October 2017 - 01:24 AM

Dear Bobby ,

thank you for your reply. Attached the calculation and comparison of both Propane and Propylene as refrigerant is given. What is your idea?

Attached Files



#4 Pilesar

Pilesar

    Gold Member

  • Members
  • 384 posts

Posted 10 October 2017 - 08:01 AM

A few comments...

1) Your refrigerant will NOT be 100% propane or 100% propylene. The best available propane may be only 90% propane. Allow for the real composition range in your simulation! 

2) If designed for propane, you cannot assume the system will work with propylene. If you want flexibility, put it in your specifications. Some common elastomers used in instrumentation may handle propane but not propylene.

3) Consider there will need to be on-site storage for the chosen refrigerant. Also unloading facilities.

4) Do you know the availability and cost of refrigerant? In most locations, propane would be preferred unless propylene is manufactured at the site.

5) Since you are asking the question, there is obviously no compelling reason to use propylene. The answer is 'Use propane'.



#5 Araboni

Araboni

    Veteran Member

  • Members
  • 42 posts

Posted 10 October 2017 - 08:24 AM

HI Pilesar

in our plant we have both Proylene and Propane.



#6 Bobby Strain

Bobby Strain

    Gold Member

  • Members
  • 2,226 posts

Posted 10 October 2017 - 10:48 AM

You should also give information about the evaporator. Is it existing? Process temperatures in & out. Your refrigerant evaporator pressure and temperature. The refrigeration compressor supplier usually provides a filter/coalescer to remove oil from the refrigerant. Either from the vapor or liquid.



#7 Araboni

Araboni

    Veteran Member

  • Members
  • 42 posts

Posted 10 October 2017 - 11:48 PM

Bobby

The evaporator is also to be purchased. Anyway, do you have any experience with solubility of Propylene in oil and the problem of oil degasing at discharge of compressor?



#8 Bobby Strain

Bobby Strain

    Gold Member

  • Members
  • 2,226 posts

Posted 11 October 2017 - 04:04 PM

You should ask your potential compressor system suppliers. You should also evaluate the propane and propylene with the compositions that you have available in your plant. Then determine what your savings might be. You should, of course, use the appropriate suction and discharge pressures consist with the evaporator requirement and condensing conditions. If your potential vendors have no experience with propylene, this may influence your decision. Regardless of what our experience might be.

 

Bobby






Similar Topics