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How often does the refrigeration cycle repeat itself? I have read that the compressor runs at about 1000 rpm. Does that mean that the frequency of the cycle is 1000/60=17 Hz?

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  • $\begingroup$ Aren't most refrigerant systems continuous operations? $\endgroup$ – Chet Miller Apr 26 at 13:20
  • $\begingroup$ @ChetMiller, there is a thermostat inside refrigerators that holds a specified temperature within a narrow range. The refrigerators have to cycle on and off to do this. $\endgroup$ – David White Apr 26 at 15:34
  • $\begingroup$ nilos, could you be more specific? A refrigeration "cycle" may mean one complete trip around a refrigeration circuit for a refrigerant molecule. You are implying that you want to know something about how fast the compressor is repeating its cycle as it is producing high pressure refrigerant. $\endgroup$ – David White Apr 26 at 15:38
  • $\begingroup$ @DavidWhite That is not what I was referring to. That thermostat cycling is obviously very low frequency. But during the on-operation, the refrigeration circuit at any time can be regarded as continuous and steady state (i.e., not involving a piston compressor), right? $\endgroup$ – Chet Miller Apr 26 at 19:13
  • $\begingroup$ Yes, during operation, the refrigeration cycle very quickly gets to a steady state, and stays at steady state while it is running. $\endgroup$ – David White Apr 26 at 19:14
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No, that just means that the compressor delivers a given amount of refrigerant 1000 times a minute assuming a simple piston type compressor.

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If you know the mass of refrigerant and the thermodynamic cycle, you can find the amount of heat transferred as all the refrigerant goes around one cycle.

Compare that with rate of cooling the device produces, and you know how long each cycle takes.

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