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30-06-2007, 06:47 PM #1
Basic question about refrigerant to use
Hello, I am a chemical engineer trying to repair a broken laboratory chiller bath, and I am trying to understand how the refrigerant I use will affect the lowest temperature I can obtain with it (R12 vs R22)
I have a pretty good understanding of thermodynamics so that's not a problem. From what I have been able to find by researching refrigeration systems, R22 can provide more cooling capacity for a given compressor, which does not mean that it can cool something to a lower temperature. R12 is a no-brainer if the system was designed for R12 because of the damage that R22 causes to rubber seals, resulting in leaks.
Basically I am understanding that the minumum temperature possible is not as important as cooling capacity. If I may make an anology, it's like the difference between using a liquid coolant line that is -40° but flowing slowly, versus using a coolant line that is -10° with a higher flow rate. The amount of heat energy (enyhalpy) that can be removed from a system is the same for either one, if you ignore the boost in compressor capacity provided via R22.
Am I making any sense here?
Thanks in advance,
Craig
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