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Thread: Replacing R12
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03-06-2009, 04:26 AM #1
Replacing R12
Hello Guys, i'm new in RE and I need some help.
I have this thesis at school and my group currently facing a challenge of replacing the old ac system of a hospital that uses R12. The problem is the hospital management doesn't want to totally replace the system but just to retrofit it to save money. As we all know, R12 will totally be phased out soon, so I'm thinking of a possible solution. Here are my questions:
1. What are the possible refrigerant substitutes to R12?
2. Can I use ammonia as substitute knowing that the ac system is installed in a hospital? Why or why not?
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03-06-2009, 01:13 PM #2
Re: Replacing R12
HI ,
R-12 alternative is R-134A which would need minmum system changes . Check if compressor is suitable for ester oil ( used with R-134A) . Retrofitting can be done but need to go in for system details. Ammonia for DX expansion is not suitable for applications like hospital among other applications where human being are present. A remote located secondary cooling might be okay with NH3 , but look for safety aspects.
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03-06-2009, 03:50 PM #3
Re: Replacing R12
You can use R-409A
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04-06-2009, 02:23 AM #4
Re: Replacing R12
@D.D.KORANNE: assuming safety measures are all checked, can ammonia now be used in a place like hospital??
@chemi-cool: you're right. i'll take your advice.
Thanks a lot guys!
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04-06-2009, 02:24 AM #5
Re: Replacing R12
SP34E is a good drop for a hot day
mmm to beer or not to beer...........lets drink breakfast
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04-06-2009, 02:50 AM #6
Re: Replacing R12
@lowcool: what do you mean??
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04-06-2009, 04:40 AM #7
Re: Replacing R12
SP34E is a refrigerant type,same pressure/temperature characteristics of R12,works better on temprite systems than R134A.used it in auto applications and handles high ambient conditions,found it to be a good all rounder as who wants to carry 10 bottles in their van ,i carry six(22,134,507,410,sp34e,reclaim bottle)& thats bad enough i reckon.have a chat to your wholesalers as isceon also make something similar
mmm to beer or not to beer...........lets drink breakfast
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05-06-2009, 06:51 AM #8
Re: Replacing R12
@lowcool: Thanks! I'll take your advice!
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05-06-2009, 06:53 AM #9
Re: Replacing R12
To everyone:
Is Sp34e applicable to commercial applications? I've heard it's only used in automotive ac..??
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06-06-2009, 02:17 AM #10
Re: Replacing R12
my apologies for misleading info about pressure /temp characteristic as a mate pointed out,a difference does exist,interesting as last temprite i set was at 27 psi with beer temp temp below zero.
mmm to beer or not to beer...........lets drink breakfast
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07-06-2009, 09:51 AM #11
Re: Replacing R12
hey Lowcool,
do spe34e come whit an other name to,like R... ,and where can whe find the specs for this refrig. din't find anything at Suva Dupont.
Ice
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07-06-2009, 04:08 PM #12
Re: Replacing R12
At first recover the r12 from the system and the retrofit without any changes with r409a.
The pressure are the same that r12.
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09-06-2009, 02:12 AM #13
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09-06-2009, 05:52 AM #14
Re: Replacing R12
For a start ammonia [ nh3 ] is not an option.
Reto-fitting existing systems with what ever refrigerants, will be a stop gap resolve.
Get along side the bean counter from hospital and explain the big picture, that if they spend money on a total replacement fit-out. You will effectively save the hospital a huge amount of money.
Just a thought. magoo
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09-06-2009, 06:58 AM #15
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