This has to be the Best description of a refrigeration cycle I've seen (seen many). Easy to understand, plain and sensible use of English, organized and good flow, fast, etc. No adiabatic, enthalpy, and other complicated terms that distract. Good job! Thumbs up
i know im randomly asking but does any of you know of a trick to get back into an instagram account..? I somehow lost the password. I would love any assistance you can give me
@Nikolai Maximus thanks for your reply. I found the site through google and I'm trying it out atm. I see it takes a while so I will reply here later with my results.
"we're not taking hot air out of the house, we're taking heat out, the two air flows are separate" This immediately helped my understanding of the cycle.
I am someone who is just getting in the HVAC-R trade. I have been going on ride alongs with a company and the gentian I've been learning from has been teaching me this process. After watching this video it all clicks to me! this is one of the best teaching videos I've watched. Thank you.
I have been watching many videos, I heard the superheat/subcooling over and over. With the explanation here, all makes now sense. Thank you, thank you.
Most outstanding! Great video. Explained thoroughly and clearly plus you covered a lot of pertinent details like in/out temps for evap and condenser. Plus it is the first time I have ever seen that explains how the evaporator keeps liquid out of the compressor. Thanks so much
I'm studying 5th Class power engineering here. I'm already a plumber, so I've got the boiler stuff down pretty well. The refrigeration side though, is the next largest part of the provincial exam. I know very little about refrigeration. This is the best video I've found yet. Thanks
Thanks for the simple explanation, now I have a good foundation to build on. Especially the metering device was always a difficult explanation to try and sort out, but you did it for me. Thanks again sir
i been trying to under stand this for the past four week and for the life of me i could not get it at all... but this video help me in just the 1st watch... thank you alot sir
@@measureQuick This is really and truly the best explanation out there on the refrigeration cycle. It i much clearer too me now. I have been lost in class for sometime now.
Do you know if there are videos of some one going through the system. like you do here except with different faults and how they affect the system? It would be tremendously helpful to people how are visual learners.
You'd think I'd understand superheat and subcool by now, but I didn't until this video! It's just the temp above and below boiling point, now I get it! I still view the refrigeration cycle as the closest thing to real life magic I know besides flight.
This was well presented but it contains one flaw common to every refrigeration cycle explanation I have ever encountered. The job of the compressor is not to increase the pressure; its job is to increase the temperature. It accomplishes that job by increasing the pressure. I believe that one of the reasons so many people struggle to troubleshoot refrigeration systems efficiently is because of this inappropriate elevation of the importance pressure change in the cycle. Of course, it is important but the job of a refrigeration cycle in an air-conditioning application is to absorb heat from cool indoor air and shed it in warmer outdoor air. The heat absorbing coil must be cooler than the indoor air it is absorbing heat from, and the heat shedding coil must be warmer than the outdoor air it is shedding heat too. To do this it would be obvious to the student that there has to be a mechanism in the cycle to make the outdoor components warmer than the indoor components. To me it makes more sense to explain that this is the job the compressor does, raise the temperature, and to explain that the metering devices job is to lower the temperature. Then explain that the compressor raises the temperature by raising the pressure and the metering device lowers the temperature by lowing the pressure. Temperature change is PRIMARY, pressure change is just the means to that end. The refrigeration cycle contains five basic components: a heat carrier (refrigerant), a heat absorber (evaporator), a temperature increaser (compressor), a heat shedder (condenser), and a temperature reducer (metering device).
Thank you for this video. Originally the blue gauge showed the saturation temperature of 20 degrees F (Pressure 43 PSI R22). At the same time the temperature I measure on the blue line next to the charging port is 80 degrees F. Thus my Superheat is 80 F - 20 F = 60 F. The pressure at the red gauge before charging was 200 PSI that corresponds to the temperature of 102 F. When I charged the system from the R22 recovery bottle, the Superheat changed 75 F - 26 F = 49 F. my red At the same time my red gauge after charging shows the pressure 225 PSI or it is the temperature 106 F and I measured the temperature of the high pressure pipe was 106 F. Question- is my system is overcharged now of I should continue charging it?
hi,Thanks for your clear explanation of Refrigerator 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
thank you for the video but I still don't get how the heat is remove from inside the house? is thru the evaporator coil ? but once you remove the hot air from the inside the house and supply 55 degrees what happens to the heat? where does it goes?
You are not removing the "hot air" you are removing the "heat" from the hot air. The refrigerant in the evaporator absorbs a large amount of heat converting from a liquid to a vapor and the heat is rejected outside in the condenser to the outdoor air as the refrigerant is condensed back to a liquid. The boiling and condensing are controlled by controlling the boiling and condensing points of the refrigerant with the selection of the compressor and metering device and refrigerant type.
Have a side by side KENMORE FRIDGE, THE FREEZER FREEZING BUT THE FRIDGE NOT COOLING NO VOOL AIR COMING THROUGH THE AIR VENT INTO THR FRIDGE. COULD SAY WHAT'S THE PROBLEM?. THANK you so much.
Thank you for this video, may I ask you a question? My understanding is that the evaporator is physically located at the top of my furnace and this is what creates the cold air. Perhaps the condenser is physically located inside the AC unit outside. Am I correct? Also, the water boiling point depends on the pressure. If the pressure is very high then the water will not boil at 215 degrees. At the same time, the water can boil at the top of the mountain at 80 degrees Celcius. What is the purpose of the metering device and where it is physically located?
Yes, on top of the furnace, condenser outside, boiling point and pressure are directly related, water is only an example as it behaves like a refrigerant when it changes state. The metering device drops the pressure of the refrigerant and I turn the temperature. It enters the metering device at about 90 degrees and leaves at about 40 degrees on a typical system. The cold refrigerant then absorbed heat in the evaporator. The compressors job is to compress raise the temperature of the refrigerant by compression so we can reject the heat outside at the condenser.
@@measureQuick @Ty Branaman Thank you for your prompt reply! I am just learning it. I was just recharging my AC from the R22 recovery bottle. I measured the pressure inside the bottle and at the beginning, it was 148 psi at an outside temperature of 84 Fahrenheit. I purged all my hoses red, blue, and yellow. I have connected the yellow hose of my R22 charging manifold to the vapor side and placed the tank upside down on the scale. When red and blue hoses were connected (red to the thin high side and blue to the thick low line) and the air conditioner was off I measured on the red line 120 PSI and on the blue line 115 PSI. When I started the AC, the red line was at 195 PSI and the blue was at 195 PSI. I started to add the R22 refrigerant from the bottle via the blue side vale in small portions and after 20 minutes of charging blue line was at 38 PSI and the red was at 205 PSI. After 30 minutes of charging the blue line at 44 PSI and the red line at 210 psi. What is bothering me is that at the beginning the air temperature inside my house leaving the air duct was 16.2 degrees Celsius and after 30 minutes of my AC charging it was 18.6 degrees Celsius. Also, I was under impression that the red line pressure will go up after charging and the blue line pressure should actually go down, but in my case, it went up instead. Any recommendation for what I have done wrongly?
Scan through the video, there are ones on charging. You cannot charge with just pressures. You need to look at the driving conditions, superheat and subcooling. You also need to have correct airflow. I would recommend that you work under an experienced technician before you attempt to adjust the refrigerant charge on your own. It is often the last thing that needs adjustment. Clean coils, a clean blower, leak free ducts, correct airflow and other variables are much more important. Things need to be evaluated at a system level.
@@measureQuick My AC was working fine till this summer when it was not able to cool down below 25 degrees in my house when outside was 31 degrees Celcius. I called the technician to give me a quote to recharge the AC and he told me that the R22 cost now more than gold so I decided to do it myself. I purchased the manifold and the recovery R22 tank and spent twice less money. After I recharged my AC started to work properly and is able now to cool down below 24 degrees Celcius in my house with the outside temperature of 31 degrees. From the youtube video, I have learned that the Superheat temperature is usually about 10-12 degrees Farenhight and the measured temperature on the high side usually would change about 2 degrees Farenhight, so I came to the conclusion that there is no need to measure it, I will just go by the temperature reading from the high side. I can re-use the manifold and the R22 tank in the future when I need them. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-b0gsuh-Sno8.html
@@measureQuick Today I measured the duct air temperature and it is 16 degrees Celsius instead of 11-12 degree Celsius. I also noticed that my return line is at much warmer temperature (it is hot) then it should be. Is this an indication that my AC compressor is not able to produce enough compression? Or this the indication that I have to re-flush the R22 refrigerant? Thank you.
It's said that during "flashing" liquid is lost - does that just mean it instantly becomes vapor or does it actually "lose" a small percentage of that refrigerant - resulting in someone having to come and provide the system with more refrigerant?
Liquid it transitioned to vapor flashing off in the piping between the meting device outlet and evaporator inlet. It is all sealed or contained within the system. No refrigerant is lost to atmosphere.
@@measureQuick Thank you, that is what I had assumed. So why does it reduce operational efficiency when more liquid is "lost" to flashing? You'd assume, when leaving the metering device, the more liquid that changes to vapor would increase efficiency in the evaporator as its purpose it to ensure all the refrigerant leaving is vapor.
@@measureQuick is it because if the refrigerant becomes vapor to quickly then as it goes through the evaporator the superheat will increase and therefore unable to assist in cooling the compressor?
Flash gas can cause a increase in superheated vapor but wether it impacts the compressor cooling is dependent on the metering device. If it is a TXV, it will open further to control the superheat at the evaporator outlet. If a fixed type the superheat will increase. That said, unless the load is very high for a long period of time it will not be an issue for the compressor.
