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Thread: Co2 systems
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20-07-2008, 10:33 AM #1
Co2 systems
Hi has any one come across transcritical systems working on Co2, I know that Linde have a number of systems installed ove europe?
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20-07-2008, 06:44 PM #2
Re: Co2 systems
Star Refrigeration are punting a small one, athough I believe they dont have any tried and tested in the field
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20-07-2008, 09:49 PM #3
Re: Co2 systems
Yes, I have. Linde, Knudsen Koling, Ahlsell.... questions?
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21-07-2008, 01:06 PM #4
Re: Co2 systems
There is one installed in a supermarket in Adelaide Australia
...and she said "give it to me you big fridgie"
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21-07-2008, 01:15 PM #5
Re: Co2 systems
Hi all thanks for replys, I was after some information with regards the Transcritical side of things, i believe there are no condensers on this type of system?
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21-07-2008, 02:11 PM #6
Re: Co2 systems
What was called condenser in a subcritical or normal cycle, here is called "gas cooler".
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21-07-2008, 02:14 PM #7
Re: Co2 systems
You donīt condense in a transcritical system so you donīt have a "condenser" but you do have a heat exchanger that does the same function: reject heat of compression+heat absorbed.
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21-07-2008, 03:22 PM #8
Re: Co2 systems
How does the gas cooler work? how do you get liquid?how do you maintian liquid pressure?
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21-07-2008, 03:59 PM #9
Re: Co2 systems
the gas cooler does what it says: it cools the gas, but being supercritical, it doesn't condense, so you don't get liquid.
After the gas cooler, a special regulation valve is installed, which lowers the pressure (it's a throttling device, like a TXV, but unlike a TXV it doesn't throttle liquid). As the pressure lowers, the gas approaches the critical pressure and transforms into liquid.
The difference between a normal cycle and a transcritical one, is that in the latter liquid forms after the throttling device, while in the former cycle liquid is present already before of it.
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21-07-2008, 04:05 PM #10
Re: Co2 systems
Thanks all is becoming clear.
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