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Thread: Refrigerant for road transport
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22-03-2007, 12:46 PM #1
Refrigerant for road transport
A local manufacturer wants to quote for transport refrigeration in Dubai.
With air cooled condenser at 40degC ambient and container temperature at -20degC, thats quite a lift for 1 stage.
What refrigerant is best for these types of applications?
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22-03-2007, 12:59 PM #2
Re: Refrigerant for road transport
Bock FKX50/775N for refrigerated transport, Te=-25°C, Tc=60°C, Tsuction=-15°C, COP=0.80 with R134a
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22-03-2007, 01:38 PM #3
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22-03-2007, 02:11 PM #4
Re: Refrigerant for road transport
Yes it is. Costs are little higher, though.
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22-03-2007, 02:24 PM #5
Re: Refrigerant for road transport
What about R-507? I was under the impression this was a replacement for R-502, and R-502 systems used to operate in these conditions (or similar to) for many years with conventional equipment designs.
If all else fails, ask for help.
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22-03-2007, 02:48 PM #6
Re: Refrigerant for road transport
I think R507 would not be compliant to max allowable pressure on high side at that Tc.
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22-03-2007, 03:06 PM #7
Re: Refrigerant for road transport
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22-03-2007, 03:51 PM #8
Re: Refrigerant for road transport
Originally Posted by NoNickName
R-507 is slightly higher than R-502 (based on memory), but the air-cooled condensers and other equipment should be able to operate under these conditions.If all else fails, ask for help.
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22-03-2007, 07:53 PM #9
Re: Refrigerant for road transport
I don't know what is the max PS in South Africa. Definitely impossible to use in EU at that Tc.
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22-03-2007, 09:13 PM #10
Re: Refrigerant for road transport
How about just buying a Thermo king Magnum
R404, unit SHOULD !!!! work in ambients up to 50 degrees. i am sure carrier must have an option but just trying to keep reeferjon happy
http://www.thermoking.com/tk/index.a...euromideafrica
Regards
Raymond
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25-03-2007, 07:18 AM #11
Re: Refrigerant for road transport
If I look at R507A,
It is probably a bit close to critical. But, look how the characteristic of the gas squeezes the refrigerating efffect.
I guess in any event, you are constrained by the compressor manufacturers choice.
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25-03-2007, 12:36 PM #12
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26-03-2007, 01:36 AM #13
Re: Refrigerant for road transport
the fact that thermoking does it, it doesn't mean it either works or it's the best thing to do. I remember Carrier is doing Free Cooling by pumping refrigerant in the condensing coils during winter time"If Hannah was an air handler, I would be a condensing unit so I could open her TXV and pump my refrigerant through her coils." - a HVAC friend of mine
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27-03-2007, 11:12 AM #14
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27-03-2007, 11:51 AM #15
Re: Refrigerant for road transport
Yeah, sure.
Aren't we interested in reducing the refrigerant amounts in chillers?
Isn't refrigerant taxed per Kg in Danmark and Norway?
What about a refrigerant loss?
For nh3simman: PS is service pressure, the max pressure allowed by national or international regulations.