×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

replace R134A with R404

replace R134A with R404

replace R134A with R404

(OP)
I have two identical freezer/ cold store.

The Freezer is on R404 and the cold store is R134a.
My customer has now asked if he can change the cold store with R134a to a freezer with R404. As the information on the evaporator indicates that it can handle both refrigerants and the units are identical I want to empty and clean the system, and replace the R134 compressor condensor for an R404 compressor and condensor. But my college tells me this is not possible due to contamination? what is your opinioin?
 

RE: replace R134A with R404


R 404 contains R134 as one of its components, so I do not see contamination being a problem.( R404a: hfc-125,44% hfc-143a,52% hfc-134a,4%)
 R134 is considered to be more efficient than 404 except at very low temperatures, when 404 is supposed to be better.
If your cold store is running at a higher temperature leave it alone.
 If you have to get the temperature down to that of the freezer, then look at making the switch. Also check to see what oils are being used.
B.E.

RE: replace R134A with R404

There is no need to change refrigerants because
R-134 can easely do at good job at -20*F sst and 105*F sct and it it has a better EER of 11% at those temperatures, uses 12% less KW/h and has a lower discharge temperature

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources