HVAC 114 Refrigerant blends, glide, bubble, dew, zeotrope, azeotrope 

Not sure if you completed a lab on latent heat transfer but this will greatly help you understand the theory of the refrigeration cycle.

Thank you very much for that! I will be setting up a donation method by next week. Thank you!

Thanks I'm still learning new stuff every day. Stuff I thought I new I discovered a new angle. What a great career it is.

Thank you. 22 was a great refrigerant. I will be making some videos on 32 and 452B before long.

100% correct!

That's correct. If you look at a blend of refregerants in the condenser. It's where the refregerants would just starting to condensed, change state from a vapor to a liquid.

What ever it takes to remember it. Submarines start way before this. I found most students struggled with how to find superheat and subcooling. They think the "cold line" should be subcooling because it was cold. So the subcooling submarine and subcooling song comes in to help them remember that. Since they already have that down earlier in the class it's easy to add for bubble and dew.

That's correct but there is really no benefit to charging as a vapor. It takes much longer and there is always the possible risk of fractionation.

@@love2hvac I saw a video of a guy charging 410a with the jug upside down, and he had to tease it in by opening the low side manifold valve in short bursts because you can't just let the liquid flow continuously, and since there is no way to know if the intermittent bursts of liquid are getting a full chance to boil to vapor in the line, you are just playing it by ear. I'd say there is some risk in this too. I do understand that it speeds the job up when you tease it in as liquid intermittently because that's what I do with cars and it's generally safe because cars have accumulators and the low side shrader is usually located before the evaporator so the refrigerant passes thru the evaporator and the accumulator before reaching the compressor. I even did it once with R22 on my 24 year old home system when I was topping off the charge and it was taking too long, so I picked up the jug and sloshed it sideways a few times while watching the low side gauge carefully. People will probably say I was foolish to do that, I don't know, but it was years ago and the compressor still runs fine, I have thermometers in the air handler right below and above the A coil and the system makes a delta T of 21 or 22 all summer long, runs like a champ, it only needed a top off after 20 years of service. I don't see anybody charging R22 with the jug upside down. Does anybody ever turn the jug upside down and tease it in with R22 to speed it up? I'm not a tech so I wouldn't know, I only know what I see on You tube lol.

I charge as a liquid even with 22. Throttle it in. Every video with charging I show how to throttle it in. Very short burst. By the time the refrigerant flows across the valve it expands and boils into the suction hose. The it's restricted threw the low loss fittings and again by the valve core. It then enters the larger suction pipe where it expands to a larger suction pipe. The compressor will be fine. It's not nearly as close as automotive and the shell of the compressor can accommodate very small amounts unlike automotive. When dealing with other 400 series refrigerants, like 407C, the glide is larger and it will fractionate charging in a vapor. You can also get a sight glass for the suction hose to see if it turns to a vapor before it gets to the suction pipe. You can also open and close the tank valve to allow more time and hose length to allow the refrigerant to expand to a vapor. You by a restrictor that slows the flow in called a liquid charger.

@@love2hvac Thanks for the info. I'm going to look at your charging videos.

When refrigerants are mixed the boiling point for all the refrigerants in the mix change. Chemical manufacturers have to test the new mixtures. They determine that above the dew point they are all a superheated vapor. Below the bubble point they are all a Subcooled liquid. The mean will be the average temperature between the bubble and dew point giving an idea for the coil temperature for TD calculations. This is also why it's important to not mix Refrigerant in the field. Even if they have similar saturated temperatures separately, they will have completely different saturated points mixed. Without the multimillion dollar lab, there is no way to know what the new dew, bubble or mean point is of the new mixture.

I agree! So great know others know the meaning of the words! 😁