Refrigeration Cycle Study: Step by Step, Detailed and Concise!

Hello friends, this is Sg Automation and today what we're looking at is the basic refrigeration cycle.

Alright, so you can take this as looking at it as if it's a standard air conditioning system. Alright, so you have two items that separate the low pressure and the high pressure on this system and the one is the compressor that's up high and then the other is the metering device where , you see it's down low.

how the refrigeration cycle works?

So how the refrigeration cycle works is it takes low pressure and low temperature vapor refrigerant, it comes into the compressor and out of the compressor ,it comes out as a high temperature, high pressure vapor refrigerant. In fact it's at its hottest spot on the entire system right there. A sit enters into the condenser coil it starts rejecting heat.

As it rejects heat it starts turning into a saturated state in the middle of the condenser coil. A saturated state is where vapor and liquid both exist at the same time.So right the saturated state where it turns into a complete liquid until, where it comes out right next to the service valve, the temperature decrease as its rejecting heat, the temperature decrease in liquid form is called the sub cooling.The saturated state is is where it's transferring most of its energy .

what is carrying the heat and moving

Alright, the refrigerant is what is carrying the heat and moving it, rejecting it and absorbing it in the refrigerant itself. And most of that energy transfer occurs right in that saturated state. so it comes from the saturated state in the middle of the condenser coil, it continues to reject heat as a complete liquid, until it comes out of the condenser coil. Then it comes down and then it makes a left and then it goes in through the filter dryer.

WORK OF FILTER DRYER

The filter dryer is there to absorb any moisture in the system. It has a fixed capacity . It goes through that and then it hits the metering device. The metering device allows for a pressure change.When you have a pressure change so you have high temperature, high pressure liquid refrigerant coming into the metering device and then it turns it into a low pressure then what happens is it automatically makes it a low temperature as well. So if you decrease temperature then pressure will decrease.If you decrease pressure then temperature will decrease. So in this case we have a high pressure, high temperature liquid refrigerant coming through and hitting the metering device. The metering device is only going to allow a small amount through and then it turns into a low pressure,low temperature eighty percent liquid 20% flash gas mix but, it's mainly going to be a low temperature, low pressure liquid until it gets to the middle of the evaporator coil. So the refrigerant is actually absorbing heat once it enters into the evaporator coil. As it absorbs enough heat it turns into that saturated state in the middle of the evaporator coil, where most of the energy absorption is taking place and then right after that is where it turns into a low pressure, low temperature vapor.

After the saturated state it turns into that low pressure, low temperature vapor until where it comes out of the evaporator coil. It's still absorbing heat. As it comes out of the evaporator coil, right at that point right there, the temperature increase from the saturated state in vapor right at the end of the saturated state in vapor to where it comes out, that's called the super heat. If you continue along you keep coming up as a low pressure, low temperature vapor.You come up and then you make a right and then you come over to the service valve. So that's where we take a super heat reading at.

So if you took in the middle of the evaporator coil, after the saturated state where it turns into a complete vapor the temperature increase from there, all the way over to the service valve, next to the compressor that's called the total super heat. After that it just enters back into the compressors and low pressure, low temperature vapor refrigerant and the refrigerant cycle starts all over again. Well I hope you enjoyed yourself and we'll see you next time at Automationwale.blogspot.com !