Explaining SUPERHEAT on an AC Coil Quickly!
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- Опубліковано 1 жов 2024
- In this HVAC Training Video, I show how to explain SUPERHEAT to another technician! Superheat is the rise in temperature of the vapor refrigerant. This occurs at the indoor evaporator coil during air conditioning mode! Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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The purpose for superheat is to ensure that the compressor doesn't slug liquid refrigerant. (Compressors are vapor pumps). With a piston metering device, you must find your target superheat based on indoor wet bulb temp and outdoor dry bulb ambient (IDWBx3-80-ODDB divided by 2). If you have a TXV, it does that for you (if functioning correctly).
Proper subcooling (usually on outdoor nameplate) ensures that you have liquid entering your metering device at the evaporator coil.
Too much refrigerant means risk of liquid migration back to compressor, high head pressure, excessive compressor run load amps (RLA) and system inefficiency, etc.
Too little refrigerant and you won't have the required change of state from vapor to liquid and vice versa. Also, a loss of efficiency and possible freezing up of evaporator coil. There are other variables to consider, of course.
Stay cool my friends.
Great job and understands greatly!
You're a good person and an excellent teacher. I appreciate you trying to educate the public on expensive AC equipment operation, so they can make better decisions. I know many struggling families who cannot purchase ac units because of pricing. When they understand how the systems work, they feel like they have more control and can make decisions.
Yes That's how you charge a system by the target superheat or sub cooling depending on the metering device on the system
I had a tech tell me when a unit has a txv never look at the superheat. I understand that we don’t charge the unit by superheat when a unit has a txv but both Sc/Sh should be relatively close to each other due to the unit being a sealed system( I know not exactly close but relatively close). Which means the subcool and super heat should both balance each other out if the metering device on the unit is working properly. Am I wrong for thinking this way? For example one unit had a txv with a target sub cool of 10 and the units subcool was 13 and the super heat was 3. The tech I was with deemed the unit good. Is that correct ? Is there not an indication of a restriction or a problem? ( I’ve been in the trade for a year)
You're on the right track. 3 degrees of SH on a TXV coil would raise my eyebrow. A TXV coil with a low SH could mean dirty air filter, blower on too low of a speed, undersized supply or return ducts, dirty evaporator coil, mismatched tonnages between indoor and outdoor, TXV stuck partially closed or possibly overcharged. (If it's overcharged, your SC will be abnormally high though).
Also, every reading on your gauges (I use SMANs) is important. That info gives you a complete picture of the system performance. If things don't seem normal, chances are you are on to something. Attention to little details are what set the decent techs from the super techs. I tell guys to use all their senses when diagnosing problems. Always remember that you gotta have proper airflow and clean coils (indoor and outdoor) to get proper readings or else they'll look skewed.
Craig, I bet ya love getting schooled up by the YT community.....lol! They don't even know how 'pro' you are....
Could you do a follow up on this video with an infrared camera on a running system? So we can visually see this? I think that would make some really good content and help people visualize it even better.
When I was trying to diagnose a potential TXV issue, I used an infrared and could visually see all the various temp drops and increases that you mention..
That then lead me to question what should the temperature drops be? There is a huge temp drop between the high side and low side at the txv, but there was another temp drop that I could see at octopus distributer thing... I would assume that is normal because it is an even lower pressure as the flash gas goes past the manifold on the distributer and into the individual lines into the exchanger?
Hope that made sense...
I actually have been looking for the answer to this.. would you happen to know?
The drop at the TXV is from a large area to a smaller area right at the distributor. The distributor is a further restriction and will cause an additional temperature drop before entering the evap coil. So, you are correct.
Great job as always, on this explanation of superheated.
Could you do one for subcooling at the condenser?
Would you agree it's a good idea to have a vapor port at the evaporator, as to diagnose better at coil ,nd metering device ?
We will be having one posted on subcooling as well! You woukd still need to chack total superheat for compressor safety too though to make sure only vapor enters!
Subcool is the opposite.
It is the amount of heat removed from the liquid below saturated vapor pressure.
Superheat is a sensible measurement of the amount of heat added to a substance above its boiling point. The largest amount of heat transfer happens during this phase change.
Titration?!
So in this case, when it reaches the top of the coil, that's where there's about 10 degrees of Superheat? Since it's 100% vapor and 10 degrees warmer than the non saturated vapor below it?
Thats absolutely correct!
Superheat is not "10 degrees" always. It varies depending on outside air temperature and indoor wet bulb temperature. As long as there is some degree of superheat, it "all" vapor" or minimal liquid. I've had superheat calcs come back targeted as high as 28 degrees on hot muggy days in hot muggy houses.
@@rcstl8815 yeah I know that. I was talking about this specific scenario
@@joziahcorbett2399 Not sure what you're asking, yes his 10 degrees SH is at the point it is measured.
My answer was not just for you.
Love your videos!!!
wow. thank u for explaining this in a way that was easy to understand.
still doesnt make sense. I watched it 100 times
That is great !
Thanks!
Thank you🎉
80 20 40
Thanks for sharing this with us 🇺🇸....
👍👍
Latent heat of evaporation
Listen closely. Doesn’t he sound like Kermit?
A better way to say that would be heat added to refrigerant after it’s turned to 100% vapor