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Thread: Refrigerant Properties
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17-01-2008, 11:31 PM #1
Refrigerant Properties
Hi there!
Please could somebody clarify how a refrigerant's boiling point (at 1 Atm) is correlated to the lowest achievable temperature of the system ?
e.g.
for R600a, which has a boiling point of -11.6 C, what's the lowest air temperature that could be achieved ?
Similarly, for R290, which has a boiling point of -42.1 C, what's the lowest air temperature that could be achieved ?
Many Thanks in advance...
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17-01-2008, 11:55 PM #2
Re: Refrigerant Properties
Simple...refrigeration system is a closed system and we use regulating - expansion valve and compressor to reduce internal pressure, thus our refrigerant evaporate at lower pressure with lower temperature....
at 0,291 bar (absolute) R600a has a temperature of approximately -39,94*C...the lowest one can be about -46*C....
at 0,702 bar (absolute) R290 has a temperature of approximately -49,9*C....the lowest one can be about -56*C
, may I ask what for you need low temperature, please
Best regards, Josip
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Don't ever underestimate the power of stupid people when they are in large groups.
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18-01-2008, 04:23 AM #3
Re: Refrigerant Properties
Originally Posted by stephen.t
Therefore, if you want to have positive pressure in the evaporator at low temperatures then you need to select a refrigerant which exhibits this characteristic.
Otherwise, if you operate the system in a vacuum you can still get colder temperatures.If all else fails, ask for help.
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24-01-2008, 07:04 AM #4
Re: Refrigerant Properties
Thanks Josip & US Iceman
Your answers make things much more clear now..
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14-02-2008, 02:07 PM #5
Re: Refrigerant Properties
what is your s. pressure ?
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