Basic refrigeration cycle

This is the beginning of the basic refrigeration cycle training.
This video is part of the heating and cooling series of training videos made to accompany my websites: and to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.

26 Replies to “Basic refrigeration cycle”

  1. hi Thanks for your clear explanation of Refrigeration Cycle I have one rather important question I would like to ask. Your Airflow where does the Air come from. Is it normally a Close Loop System where the Air is constantly re-circulated by the Evaporator Fan in the Fridge, or is Fresh Air Intake going on so that the Evaporator Fan is constantly pulling Fresh Air from the Outside and blowing it through the Evaporator Coils inside the Fridge. Also if it is not a close Loop System and the Fresh Air is constantly being sucked in from outside , is it vented out as it is recirculated inside and replaced by a fresh stream of air. Thanks

  2. wonderful session of teachings.what is your comment to the refrigeration users since most clients ie mombasa kenya where there is high cost on power usage prefer controlling there systems by putting systems on and off manually to minimize high bills despite them being adviced by professionals that similar practices results to more higher bills.

  3. My fridge is not working underneath,the deep freezer on top is working well.what might be the problem

  4. I have a critical question and i spent a lot of time searching on the answer and can't find it.

    As we know the condenser receives the high temperature and pressure superheated vapor comes from compressor and condensing the refrigerant … this lead to decrease the refrigerant temperature but the pressure is still high ( before and after condenser ) despite the temperature fall down …. from supposed the pressure will also decrease but this not happened ,,,, what is the explanation of this ???

  5. I have a test on this Tuesday. I read the chapter, but this really clears it up for me. Thanx

  6. why condenser on AC units have lots of aluminum fins and larger copper coils meanwhile refrigerators have just that joke of a radiator behind or on the base, what would happen if i modify that refrigerator condenser with another one or even better if i put it underwater in some way.

  7. After the expansion device its not fully liquid. its in the form of saturation with 75 % liquid and 25% gas

  8. When first assembling, where would the refrigerant be stored? Is it stored in its gas or liquid form? What gas or liquid could function as a refrigerant?

  9. Strange question perhaps, but what will the refrigerator do when I turn it on for the very first time? What part comes into action first and why?

  10. dos a condenser take the heat generated from the compressor out of the refrige erant and then turn it into a liqwid then gos throg the expanshion device then enters low psi and low tempaturs.becaws low psi results in low temp. ubsorbing heat. turns to a gas in the evaperator at the same time sucking heat from the air. then gets pulld into conpressor gets heat from conpressor at the same time being a gas. thats wene the condensor jumps in and cools it and turns it into a liqwid then repeat.

  11. thnx dude i really understand now how it fully works the compressor change the low pressure vapor to a high pressure vapor and the metering device change the high pressure liquid to a low presser liquid

  12. Great video, but I have a question, we know that the temperature drops on the high side because the refrigerant turns to liquid from gas. The temperature out of the compressor is "Super heated – all gas" and close to the Exp device is "Sub cooled liquid".
    My question is what happens to the pressure? Does it stay the same in all parts of the condenser or does it drop too?

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